China Plastic Injection Molding & Metal Die Casting: 十二月 2014

2014年12月29日星期一

Floppy button design and numerical simulation of injection molded parts

Most companies have adopted CAD, CAE, CAM software for design and manufacturing, but the limited domestic production and technology, according to the performance of the product CAD / CAM design and manufacturing of integrated land far from popular, is only carried out separately Products CAD or CAM, the products did not take full advantage of a unified data model design and manufacturing integration. In this paper, floppy plastic buttons, for example, use of Moldflow injection molding analysis software to simulate the process of analysis, the results of a more satisfactory design mold structure and complete the mold assembly map and the main part drawing.

I am Frank,works as sales manager of Bestar China Co.,Ltd.which is a reputable China plastic injection mold maker of plastic injection molding with over 15 years.

If you are looking for a China molder maker to make your injection mold,you can contact me at any time.

My company website: http://www.bestar-china.com/

Feature-based non-manifold modeling system to integrate design and analysis of injection molding products

Current CAE systems used for both the simulation of the injection molding process and the structural analysis of plastic parts accept solid models as geometric input. However, abstract models composed of sheets and wireframes are still used by CAE systems to carry out more analyses more efficiently. Therefore, to obtain an adequate abstract model, designers often have to simplify and idealize a detailed model of a part to a specific level of detail and/or abstraction. For such a process, we developed a feature-based design system based on a non-manifold modeling kernel supporting feature-based multi-resolution and multi-abstraction modeling capabilities. In this system, the geometric models for the CAD and CAE systems are merged into a single master model in a non-manifold topological representation, and then, for a given level of detail and abstraction, a simplified solid or non-manifold model is extracted immediately for an analysis. For a design change, the design and analysis models are modified simultaneously. As a result, this feature-based design system is able to provide a more integrated environment for the design and analysis of plastic injection molding parts.

In the area of design and manufacturing of plastic injection molding parts, various trials have been car-ried out to develop a specialized CAD system that could be used to design of plastic parts and molds [1, 2, 3] and to develop a CAE system that could be used to simulate the injection molding process to find defects before the manufacturing stage [4-6]. The complete design process supported by the CAD and CAE sys-tems is illustrated in Fig. 1. At the initial design stage, the CAD system dedicated to the design of the plastic part can be used to enhance design productivity. The structural analysis and the molding process simulation using the CAE system can validate the initial design. If the simulation results do not satisfy the functional requirements, the design process is repeated by feed-ing back the simulation results to the CAD system. The design-analysis/simulation cycle is iterated until the functional requirements are satisfied. Traditionally, the geometric models used in the design stage are solid models including the feature informa-tion, whereas the models used in the analysis stage are abstract non-manifold topological (NMT) models composed of medial surfaces and axes, as illustrated in Fig. 2. The abstract NMT models are created in the CAE system using its pre-processor. Therefore, the designer must create and maintain two types of a geometric model of a part at the same time. Moreover, the process to convert a solid model into an abstract NMT model is very tedious and time-consuming.

To solve this problem of having to create and main-tain two types of models, two different approaches have been proposed recently. One is to develop a new simulation package that can accept solid models as geometric input, and the other is to develop a com-puter program that can automatically transform a solid model into an abstract model. In the solid-based simulation package, although the effort for transfor-mation of a solid into an abstract model is eliminated, the computing time for the simulation increases dra-matically. To shorten the time, it is still necessary to remove the insignificant features from a part model. In the automated transformation approach such as the medial axis transformation (MAT), the results ob-tained by the automated transformation programs frequently require further modifications to meet the idealization rules for simulation. To reduce the com-puting time of the automated transformation approach, the detailed features need to be removed before the transformation process is launched. Although the solid-based simulation method has recently become popular, the traditional medial-surface-based simula-tion method is still useful because this method can provide simulation results more rapidly without sig-nificant loss of accuracy. Therefore, if the idealized models for both approaches can be readily provided at various levels of detail and/or abstraction from the design model, the cycle time for the design-analysis iteration can be reduced. Fig. 2. An example of solid and abstract models for injection molding simulation and structural analysis: (a) a detailed solid model for design, (b) an abstracted sheet model for analysis. To meet the above requirements, we have intro-duced multi-resolution and multi-abstraction model-ing techniques. In the proposed CAD system, various different geometric models for design and simulation are simultaneously created and merged into an NMT part master model, and for specific levels of detail and abstraction, analysis models of solid or NMT repre-sentation are provided immediately from the master model. The proposed approach is expected to inte-grate the CAD and CAE systems for the realization of concurrent engineering methodology. The remainder of the paper is organized as follows. Section 2 surveys the related work on design, analysis, and design-analysis integration approaches including their component technologies. Section 3 describes how the design-analysis system was designed. It de-scribes the functional requirements, the adopted de-sign-analysis integration approach, and the final sys-tem architecture. Section 4 describes the feature-based NMT modeling for the creation and manipulation of part master models. Section 5 describes how analysis models at various levels of detail and abstraction are extracted from the master model by using multi-resolution and multi-abstraction modeling techniques.

Extruding machine

Plastic-modern industry of main construction materials one, it is widely used in various fields. "The human has entered the polymer synthesis material age", this is not an empty. Looking forward to the 21 st century, polymer synthesis materials will enter a qualitative leap development period. Plastic is high polymer synthesis material types material. The plastic material into a plastic products is the process of plastic injection molding process. Of the many molding process, extrusion molding is important in the plastic molding of one of the process. And the technology development, especially in the economic crisis is after China electrical wire and cable industry catch up, reduces with the developed countries, and even beyond the international first-class cable giant and for the international discourse on a very good opportunity.

Experimental research on laser transmission welding of thermoplastic plastics

Laser transmission welding (LTW) of plastics has advantages of low residual stress, excellent welding quality, easy controlling and automatization. Thus, it’s widely used in many industries such as automotive and micro welding. LTW is the focus of research abroad, and has a large-scale of industrialization. However, in our country the related research is scarce and only done by the universities and institutes. Therefore, it’s very important and necessary to research on LTW of plastics.In this paper, LTW of polycarbonate(PC) and polypropylene(PP) were carried out separately. Influences of laser power(P), weld speed(v) and concentration of carbon black(CB%) as absorbent on welding quality have been discussed in details.First of all, welding specimens are obtained through injection molding. There are 8 kinds of injection molded parts in which pure PC and PP parts are used as transparent part in LTW, the corresponding parts with carbon black concentration of 0.05%, 0.1% or 0.15% are used as absorbent part. Transmittances of the 8 parts at 980nm(wavelength of laser device) are obtained in transmittance test which are all available in LTW.Then, LTW of PC and PP are carried out according to Orthogonal Experimental Design. Destructive tensile test and microscope snapshot are done after LTW, from which tensile strength and weld line photos are obtained. Through analysis we found out that for both PC and PP laser power(P) influences LTW most, followed by weld speed(v) and carbon black concentration(CB%). The best welding parameters for PC are listed as follows: Laser power(P) is 40W, weld speed(v) is 40mm/s and carbon black concentration is 0.15%.The best welding parameters for PP are 50W(P), 15mm/s(v) and 0.15%(CB%).At last, ANSYS software is used to simulate the temperature distribution in LTW process of PC. Simulations with parameters of 40W(P) and 40mm/s(v) as well as 20W(P) and 50mm/s(v) are calculated respectively which are corresponding to No.23 and No.4 of PC LTW. The results of simulations match well with the real experiments.

Effects of injection mould of valve gate technology on the weld line position and performance

Sequential-valve-injection is an important plastic injection molding method, were widely used in around world. This paper briefly expounds the principle of hot runner system and structure of sequential-valve-gate. Weld line is the most important factor can affect the quality of plastic productions, which affects the appearance and mechanical performance of plastic productions. So we study emphatically the effect on the position and performance of weld line with sequential-valve-injection. The result shows that the opening time of valve gate bring a greater influence on the weld line position control than other parameters. Then we use some finite element softwares like Autodesk Moldflow and Autodesk Algor Simulation simulate the injection molding process, then we found SVG can help us get the better plastics, which means better quality and better strength. When there is weld line on the plastic production, the effects of technological parameters of cold runner injection molding on weld line strength control are researched. The present study indicates that, melt temperature produce greater influence on the weld line strength control. After melt temperature, the major factors are packing pressure and mold temperature. The packing time have little influence on the weld line strength control.

Effect of PP injection molding product quality factor analysis

Plastic products using injection molding, plastic processing industry is an important method of molding. With the raw material melting plastics injection machine, with certain injection pressure to melt push mold, cooling stereotypes become injection products. Injection molding plastic products category, variety, the development of a wide range of applications. This unit focuses on polypropylene plastic products molding process and influence factors of the quality of products. Injection molding process is a complex system, process and products quality factors and complex. This paper summarizes the process and products quality factors, and systematically from the material, product, process and die four aspects to carry on the analysis.

DVD midplane injection simulation and design of injection mold

This design injections imulation DVD intermediate plate and mold injection mold.Through the analysis of the structure and material of the parts, created one module and two cavities, side gate feed, side core-pulling molding solution; The parts with PRO - E for 3 d modeling, using Moldflow to plastics injection molding CAE mold flow analysis, the optimal molding process parameters is determined. Through CAE software Moldflow to verify the feasibility of injection molding. In addition, using combined core cavity structure, improve the processing technology of injection mould molding parts, ensure the assembled stiffness and precision of the mould. Plastic parts using the push rod to launch institutions, simple structure, reliable operation.

Display bracket fasteners for plastic injection

Mould design is one of the most important teaching of mechanical specialty chain, is a practice very discipline, is that we learned in the previous three years of systematic, comprehensive knowledge and skills applying, summarizing and deepening of processes.The graduation project is to enable us to study the integrated use ofmechanical manufacturing processes in the basic theory, combined with the production of practical knowledge learned in practice, independent analysis and resolution of process issues, has designed a medium-complexity parts of the process specification capabilities fixture design and application of basic principles and put laws and the development fixture design, the ability to complete the fixture structural design, but also are familiar with and use of relevant manuals, charts and other technical information and preparation of technical documents and practice for basic skills. This design through analysis of plastic entity, according to the product and plastic properties determine the number of plastic injection moulding production. The product is designed for medium-volume production, and as a fastener products, mold design should take into account after injection molding product quality problems, while pouring system to automatically release, thus to ensure the surface quality of plastic parts using the gate, and selection of injection mold for the three parting surfaces, that is, "213" opening, point the gate structure. Coursing Center of mold cavity layout, gating system using point gate molding, introduced in the form of putting out punch rollout of the finished plastic part.

Development of precision injection molding technology

The polymer precision injection molding technology, impact on precision injection molding of factors, including the precision molds, injection molding machine control accuracy, precision injection process control and other computer control technology. These factors were discussed, and give the relevant solutions, finally introduces some advanced molding technology.

In recent years, as electronics, telecommunications, medical, automotive, and other industries of the rapid development of the high-precision plastic products, and high-performance requirements of growing precision molding technology to continue to progress, new technologies continue to emerge. Precision injection molding products not only require high dimensional accuracy, and low warpage, to write good, but there should also be excellent optical properties. Injection molding is the most important one of the plastic molding methods, including plastics packaging, injection, packing, cooling, and some of the basic process, thus affecting the precision injection molding of many factors. 1, precision molds

To produce sophisticated products, precision molds is essential. Die Die in general, the accuracy of the temperature control, mold and die design precision manufacturing, use of plastic shrinkage rate impacts. 1.1 Precision Mold temperature control

In general precision injection molding of parts, control mold temperature is to increase productivity. However mold temperature control for precision injection molding of great impact, it affects parts of the contraction, shape, crystallization, such as stress, hot and cold circuit design mold temperature distribution at the request reasonable, precise control accuracy, a die temperature of the best and Lengshuiji control. Mold temperature control and cooling time on the products and their impact on performance of the following factors:

melt plastic injection molds and a two-cycle time will be produced in the mold temperature difference fluctuations, and should therefore be to minimize the volatility differential peak.

the heat transfer heat through the concrete and die in the transfer out of the media, mold is changed, the media control is the key, the general import and export of its cooling water temperature difference is less than 1 °c Application of theory to calculate the average temperature, which can guarantee the stability of heat transfer. Media flow and heat transfer are interlinked, mould surface temperature can be used to control the media flow sensor to compensate for environmental temperature changes caused by mold temperature changes.

To enable stable by the heat absorption and dissemination of balance, the injection molding machine to melt injection to strictly maintain a stable temperature. Die surrounding temperature on the mold had a great impact on the general will be affected to die within the melt convection coefficient of change, so the best set up in the mold surface temperature sensor, die at any time observation of the surface temperature, and keep it stable.

(4) changes in the efficiency of heat exchange with mold after a long time in the cooling water pipes and Youban appears in the scale, then the interface to reduce the thermal conductivity should furring timely clearance.

Precision Die Design and Manufacture

Die design is good or bad is to ensure the dimensional accuracy of plastic parts premise, in order to enhance the accuracy of precision injection mold, in the process of designing a computer-aided analysis is necessary, especially for gating system and the flow of heat-conditioning systems mold temperature distribution the analysis. Applications should be as much as possible the use of simulation software and close to the actual loading conditions to melt in the mold simulation analysis in the pouring, cooling, and other non-steady-state process.

Die manufacturing quality assurance plastic parts Size is the key to accuracy, precision die is the main characteristic of the manufacturing and assembly operations in addition to polishing, are no manual processing. Die general machining and manual processing ratio is about 6:4 to 7:3, and the machining precision molds and manual processing ratio of 9:1. Die materials and heat treatment is the protection of precision molds in the molding process, the die temperature in the state, which even the mould parts tempered by low temperature, high temperature melt production and will repeat parts tempering ifij-fl! lower hardness, Consideration should also be given retained austenite caused by the volume expansion. Therefore general tempering temperature should be at least molding processing, more than double the die temperature and low-temperature processing is carried out properly in order to eliminate residual austenite. On the high-precision products for Molding precision parts, assembly accumulated precision die in the direction of the accuracy of the sub-surface as well as the parallel degree should achieve micron level. Mold should have sufficient strength, stiffness and abrasion resistance, in the injection molding deformation under the pressure of hard wear. To achieve the above processing can be three-dimensional precision machining centers, CNC machine tool and application of CAD / CAM / CAE and other new technologies.

precision molds design shrinkage rate of use

Thermoplastic plastic molding shrinkage volatile, to mold design, identify and control products cavity size dimensional accuracy difficult. Therefore, in plastic mold design should understand the characteristics and contraction caused by the shape of the parts of the difference in the rate of contraction site, and then uses the necessary compensation measures. On the high-precision plastic parts can be manufactured in the design before simple mold, measured molding to the various parts of the actual shrinkage rate, this can greatly enhance the dimensional accuracy of parts. 1.4, the design of precision molds gate

Gate type, size, location and quantity of all affected parts dimensional accuracy. At the gate of the jet, but the effects of poor feeding, thick-walled parts do not apply. Gate position and the flow of impact melt flow distance, the longer the process of the greater contraction. Multi-gate process can be shortened, but increasing weld marks. Gate parts should be designed in accordance with the size and the choice of materials and the use of software to help finalize practical experience. 2, the best precision injection molding process parameters set

Choose the best molding process parameters to reduce plastic shrinkage rate. Plastic is that the contraction of the heat shrinkable plastic, elastic recovery, plastic deformation, contraction after contraction and a comprehensive reflection of aging, usually caused by absorbent material or molecular chain rearrangement caused, the specific performance linear shrinkage rate and volume contraction rate changes in value of common contraction said. Thermoplastic plastic injection molding products shrinkage volatile, particularly for crystalline plastics injection molding products even more obvious, and not only depend on the degree of crystallinity due to the chemical structure, but also by the process of cooling parameters (cooling rate, the melt temperature, mold temperature , product thickness) the impact of the mold cavity size and design determine the size precision control products and difficulties, there is an urgent need to be aware of parameters on the injection molding of plastic shrinkage rate of the impact of the law. Part of the difference in thickness is generally believed that the two factors:

First, high-pressure melt the mold cavity caused minor deformation of a die when the elastic modulus material after the expansion. Generally speaking, quality control and accuracy can be very good dimensional accuracy, and at a higher temperature, mold low melt viscosity, viscosity smaller gradient, in a certain screw back pressure, the quality of precision parts can be accurately controlled. But for liquid crystal polymer (LCP), it just needs a lower mold temperature, it is because cold LCP case will be promptly after cooling amorphous.

LCP have low melting heat and orderly structure of the state, in the liquid crystalline state to change between crystalline solid, smaller changes, when fully cooling, the liquid - solid transition is almost complete in an instant. Die in the colder, when a cavity, the cavity material and the bulk of gate has been cured, it is very difficult stage compression added melt, thus parts and the size of the cavity size of the deformation is very close. Plastic amorphous than crystalline plastics low shrinkage with a mixture of contraction rate of low-polymer materials, elastomers at the same time as the increase of the content, materials shrinkage rate decrease. The enhanced or plastic filling, heat capacity decrease stiffness increased significantly reduce shrinkage and fiber filler content or higher, the smaller the rate of contraction. Crystalline precision plastic products also affected by pressure. As pressure crystallization of the role of injection pressure (P1), the packing pressure (P2) and the feeding pressure (P3) to speed up the crystallization process, crystallization of the P1, P2, P3, the increase in upward trend. For P1, the pressure to improve the crystallization of the degree of crystallinity, the contraction rate of increase rose P2 and P3, on the one hand because of the degree of crystallinity increased shrinkage rate increase, on the other hand increased to P2 more pressure to melt, the type cavity has been fully compacted plastic; P3-feed increased to increase, and effectively prevent reflux is conducive to reducing shrinkage. Therefore, the plastic parts of the shrinkage rate is the result of both, with the shrinkage of P1, P2, P3, the first increases and then decreases increased.

Precision plastic parts require not only stable size tolerances, but also require strict mechanical properties. These characteristics mainly depend on the cooling phase of the melt in the heat - mechanical role of the historical process. Mold temperature and cooling time on the quality of products and have a direct impact on productivity. Study found that,

given the die temperature, the dimensional accuracy of products with the cooling time is not the extension has been significantly improved, and only in a certain period of time, after a prominent role. In general cooling process in such a critical point in time there are two cooling, cooling time in the first point although production products also higher accuracy, but it is not the most stable state, and the second point-in-time cooling cooling relatively long time, However, the products enable the most stable state. 3, using precision injection molding machine to replace conventional injection molding machine

Precision injection molding machine generally larger injection power, in addition to such injection pressure and injection to meet the requirements in terms of speed, power itself will be on the injection products improve the accuracy of a certain role. Precision injection molding machine control systems generally have high control precision; it is requested by the products themselves. High accuracy can be guaranteed control of injection process parameters has good accuracy, precision products in order to avoid fluctuations due process parameters change. Therefore precision injection molding machine generally of the injection, injection pressure, injection rate and pressure-pressure, back-pressure and screw speed process parameters such as a multi-level feedback control. Precision Injection requirements of its modulus system have sufficient rigidity, accuracy or products will be a model for the elastic deformation decreased. Second-Die-Die of the system must be able to accurately control the size, or too large or too small a model of precision products will have an adverse impact. So in the design, it should be considered Die rigidity, stiffness, as well as a model system in order to accurately control the size of the precision products, especially flat-panel thin-wall products. When Die larger, must-oriented column deflection check. Precision injection molding machine also must be able to work in the hydraulic circuit precise temperature control, work to prevent the oil due to temperature changes caused viscosity and flow changes, further injection process parameters leading to fluctuations ffiH£ products would lose their accuracy.

parts molding cycle time consistency

General typical injection molding machine with three modes: manual, semi-automatic and fully automatic. As the influence of various factors, each of the previous two models molding cycle time may be different, it would affect the temperature and materials to die in the Liaodong stay, thereby affecting the accuracy of parts, in precision Molding should try to use the automatic mode.

precision injection molding machine screw temperature control and the design of new Injection Molding Machine cylinder automatic thermostat on the cycle of opening and customs led to the Liaodong, melting material density and viscosity changes, thereby affecting the quality and dimensional accuracy of parts of the cyclical fluctuations in the injection molding machine nozzle close to Die Therefore, the temperature of the nozzle molded parts also have a significant impact on. Modern injection molding machine equipped with a special process control software to control temperature fluctuation, which is proportional integral differential (P ID) control. At least from the barrel temperature difference galvanic point perspective, the P ID parameter optimization can completely eliminate temperature fluctuations.

To the quality and stability of the plastic parts, plastics injection molding machine unit is

very important. To the plastics unit is an important standard to judge: injection volume, plastics rate, injection rate, the polymers in the plastics unit at the time. As the quality of plastic parts for the dimensional accuracy error of a very important impact, and it should be precise injection control of the injection molding machine. Improve measurement precision injection molding machine of the most effective ways is to use technology to achieve the smallest screw diameter, especially for the light parts especially. The measurement of the relative screw length and the overall length of screw smaller, in the plastics materials unit at the time also become shorter. Screw thread is similar to widening the materials can be avoided stay longer so that the screw and stable operation. Lo deep groove width than correspondingly smaller, which create a lot of engineering plastics parts of the small diameter screw particularly effective. Melt homogeneity and are not small compression ratio decreases, it is because from the very shallow groove Lo caused very strong result of the shear rate. Feeding the difficulty of the design, it must ensure that all aggregates can be fed into evenly. Considering the need to shorter cycles, plastics rate must also be big enough, in the design of the feed must be effectively resolved the contradiction between. In addition, if adopted by a two-stage injection screw to achieve precise control injection error, which requires the measurement of the melt through spherical valve detected by injection to injection molding machine in the Detroit injection molding machine.

Before microprocessor controlled by the injection molding process can not be obtained through injection precision voltage comparator has been successfully resolved. Voltage comparator allows Transmitter and other sensitive came with the very precise voltage signal passed, and when the set point appears to be following the true value of a timely signal immediately transmitted to the microprocessor control of the order, by order of the cycle of operational procedures Asynchronous from time to time through a direct transfer of the signal process to eliminate, greatly improving the control accuracy. 4, precision molding technology

in the mold injection-compression molding applications (ICM) technology

ICM technology is the means to open a certain distance die under the conditions of the beginning injection, injection to a certain amount, the mold cavity beginning of the closure of the melt compression, injection mold completely closed at the termination, and then packing, cooling until the removal products. Through injection-compression molding of compression products to compaction, making products on the surface of uniform pressure distribution, the compaction products such size high accuracy and stability, small deformation. It is in the mould open circumstances melt into the cavity and, therefore, mobile channel, for the low pressure injection molding, and reduce or eliminate the pressure caused by the resin-molecular orientation of the stress and products, which improve products, dimensional stability. ICM technology and flexible control capability than the injection mould has greatly improved. Therefore use of this technology can produce more precision parts, especially the high-precision cylindrical-shaped parts.

high-speed injection molding

High-speed injection molding method of filling melts faster rate than the traditional 10 to 100 times, melt in the mold cavity to produce high shear flow, decrease viscosity, injection speed, slow down plastic surface hardening, thus improving thin Forming products wall

thickness limit, inhibit excessive molding pressure, as well as because of the low-voltage mobile mode, the products reduce stress. The thin-wall precision products, we can use the injection screw at the forward from the melt energy absorption in the screw after the cessation of movement through the expansion of high-speed melt full cavity to achieve.

no-pressure injection molding

No-pressure injection molding technology refers to the plastic melt high-speed, high-pressure filling into the mold, and then close in the nozzle needle to melt the plastic mold cavity products automatically compensate for different parts of the contract, such products can be greatly reduced warpage. However, this method requires prior estimate packing contraction added, hence the need for the injection of a higher cavity pressure value, and we need clamping force also high.

Other Intelligent Control Technology

Precision injection molding processing conditions in the process of continuous monitoring and implementation of precise control is very important. With the development of computer technology, computerized injection molding has been widely used. Among them, statistical process control (SPC), P ID technology, fuzzy logic control (FCC), network control center (NNC) method and the processing model based on the reverse of the backbone network size control. 5. Conclusion

On the high-precision plastic products, and high-performance requirements of the growing precision injection molding technology is the impetus for moving forward, people on the principle of precision injection molding, the constant deepening of understanding of precision injection molding technology is the basis for progress. With new materials, new processes and new equipment has emerged, particularly in the plastics processing computer is the wide application of the precision injection technology to create good conditions. As long as a reasonable use of these technologies, we will be able to produce sophisticated products.

Design the mold of the plastic box instrument panel

Through the plastic box instrument panel design analysis, I designed the mold of plastic parts. Throughout the mold designing process, it related to the structural of the plastic parts, choicing molding machines and die-injection molding machine and the choice of some of the important parameters of the verification process, and described in detail the design of the die-face design, casting system Design, forming part design, the top institutions to design and cooling system design, finally forming part of the processing technology development programmes. In the design process, the products are mainly based on two-dimensional drawings of Pro / ENGINEER the establishment of three-dimensional model, using AutoCAD design integrity of the mold assembly and parts map, compiled in parallel with the main parts of the mold manufacturing process.

I am Frank,works as sales manager of Bestar China Co.,Ltd.which is a reputable China plastic injection mold maker of plastic injection molding with over 15 years.

2014年12月13日星期六

Design of the Control System of Plastic Injection Molding Machine Based on PLC

Control system to the Plastic injection molding machine formed by electric relays and switching valves has many shortcomings, such as complexity wiring, low control accuracy, inconvenience maintenance and lack of flexibility. Using PLC technology can greatly enhance the machine’s overall performance. In this paper, SIMATIC S7-200 mini PLC system was used to design the Plastic injection molding machine’s control unit: including the hardware wiring and the I/O allocation. The STEP7-Micro/WIN 32 software is used as programming platform; it is very flexible, user-friendly and convenient debugging.

Design of Plastic Mold For Box Cover

Plastic molding industry is one of the world's fastest growing industry type, and the rapid development of plastic industry is mainly in the form of plastic molding equipment to rely on, so the research and development of injection molding machine and plastic mold structure and process is particularly important. At the same time, in order to improve the quality of plastic parts brought guarantee. The research content for the design of plastic mold box cover, through the analysis of structure and process of plastic parts and product review, so as to formulate a set of line with processing and mass production of a lunch box cover plastic mould structure and optimum scheme. First of all the relevant parameters on the plastic parts are analyzed. Such as product size precision and tolerances and surface roughness and parts thereof; and then according to the requirement of preliminary selected types and specifications of the injection molding machine, cavity number, the clamping force, the gate and rendering the diameter and the sub surface location selection according to the corresponding data and empirical formula, to determine forming part mold size, and then determine and choose the appropriate standard mold size. And then complete the entire mold design process Using the plastic mould design of 3D transfer 2D the design way of thinking. That is directly based on product size and other size requirements in the three-dimensional software UG drawing, determine its size and shape, is established between the various components of affiliation, create relative engineering drawings, deficiencies in the previous of some structure and size in the engineering diagram inside the modification, and update the 3D map you can. Selection of standard parts of the reference manual, select the frame size, injection molding machine specifications, gate set type and size. In addition, the design should also fully consider the mold temperature and the temperature regulating system. . Through the die design, make me some details of structure, working principle and the mold plastic mold of have a qualitative leap. This design is through the reference of all kinds of literature as well as the teacher's guidance, using three-dimensional UG and two bit Auto CAD independently.

DESIGN OF INJECTION MOULD FOR MOUSE BACK COVER BASED ON PRO/E

This paper introduces the structure design, the outer shell of the notebook keyboard of injection mold Pro/E mold supporting frame based on the principle, selection of die casting system, product exit system, design, mold temperature control system of injection molding machine, the plastic mold design steps. Including the injection mold design and mold opening and closing animation and animation in three parts. Three-dimensional modeling of first Pro/E the outer shell of the notebook keyboard, then according to the structural features of the outer shell of the notebook keyboard design core, cavity mold, mold and other structures, and then according to the design of the structure, using Pro/E 3D modeling parts mold, and the mold assembly, composed of, at the same time, the main content of this paper includes die plastic materials and injection molding material characteristics, the design principle of plastic products, plastic injection mold's principle of work and the application, design criteria, die structure and product introduction.

Design Of Injection Mold For Cover Of Fan

The plastic injection molding is known to be the most effective process for producing discrete plastic parts of complex shape to the highest precision at a low cost.An injection die with a mold cavity was designed though using the injection mold CAE software MOLDFLOW to simulate plastic flow and choosing the molding parameters of polypropylene. The molding size was designed according to the average shrinkage ratio of polypropylene.Analyzing on the structural character of cover of fan, the structure of injection mold and the mold working process are introduced. The design specialities of molding parts，the double deck structure of concretionary plastic for the gating system and the ejection mechanism were presented as well.Meanwhile,manufacturing of the molding size were introduced.

2014年12月12日星期五

Design of Injection Molding Machine of Plastics Hydraulically Powered

Injection molding machine of plastics is a machine equipment which processes all kinds of thermoplastic plastic material into various medium small scaled industry plastics product.Nowadays,along with applicatins of computer technology ,and atutomation equipments in modern enterprise,injection molding machine has maked a great developments.This text carries on research on the system design of injection molding machine. This text discuesses the injection molding machine of plastics and its related equipments in the domestic and international development circumstance.According to the factors,such as exsiting equipments circumstance,the development speed and economic condition ,I made a reseanable choice in the use of the main structure.For example:the structure of the clamping unit is assembled securely ,taking up small space.I mainly designed a body and urns of design,the piston diameter of the diameter that the machineof plastics injects the piston pole that the parts injects the oil urn covers the thickness in the design of choice ,and connect an urn of body with the conjuction piece that the urn cover pulls the pole of choice,The choice of the oil motor and the oil pump and drive the choice of the electrical engineering power that the oil pump use.I made the design of the system diagram of the presses of liquid and methods of controlling system of the electrical control project PLC.For the use of pipeline diameter,material ,I also have made a certain design.This design derives from many various similar products By the above work , the clamping unit of the injection molding machine of plastics should have a exaltation of the certain degree theoretically on the speed of clamping and the quality of product etc..,but it is needed to improve continuously in the fulfillment.

订阅：评论 (Atom)