With the rapid development of mold industry in recent years, the scope of application of new technologies, new technology continues to expand and progress to the application of the software development has been a qualitative change from the traditional experience accumulated. Mold and die market demand for products vary widely, and a wide range of CADCAM and CAE applications for a wide range of mold and mold geometry control technology has opened up room for growth in all aspects of the shape, size, material, structure, etc. changes, demanding, and allows us a lot of problems and difficulties encountered in the mold and production process, including how to effectively control the geometry of the mold and product is very intuitive on the front of us. Have different control techniques and methods for different types of molds and products. I am here today on the injection molding products forming size control talk a bit about experience, it comes to injection molding products must turn it comes to plastic injection mold, under normal circumstances, I proceed from the following aspects.http://www.prmindustry.com/Abstract...Articles section The control of a mold design
1, the first mold structure, material, hardness, precision waiting to fully understand the technical requirements of many users, including shrinkage of materials into the shape is correct, the 3D size modeling is complete, reasonable processing and analysis.
2, the shrinkage of injection molding products, flow marks, the slope of the dial mode, the weld lines and cracks, the appearance of affecting various parts of the full consideration.
3, without prejudice to the injection of product features and patterns form the premise, as far as possible to simplify the processing of the mold.
4, choose whether to appropriate the parting line, mold, forming the appearance and forming parts deburring must make careful choices.
Pushing the appropriateness of using the putter, the location of the stripper plate, jacking casing or the other way, putting and stripper plate whether it is appropriate.
6, the side core-pulling mechanism used is appropriate, flexible and reliable action, there should be no catching phenomenon.
7, temperature control how easy the plastic parts of products more suitable, whether it is appropriate to use what kind of structure of the temperature controlling oil, water, coolant circulation system which is the coolant hole size, number, location and so on.
8, the gate form, forehearth and the mouth of the feed size, gate location and size is appropriate.
9, various modules and heat deformation of the mold core impact and selection of standard parts.
10, injection molding machinery, injection volume, injection pressure and clamping force is fully match fit nozzle R, gate aperture.
These aspects of comprehensive analysis prepared from the product initial stage should be controlled strictly.
Two manufacturing process control
Full and complete consideration and arrangements at the design stage, but in actual production, there will be many problems and difficulties, we have to meet the original intent of the design in production as far as possible to identify more effective in the actual processing, more economical means of technology.
An economy to adapt to the machine equipment, for 2D and 3D processing program.
2, can also consider the appropriate fixture assisted in the production of preparations, the rational use of the tool to prevent the products of the deformation, to prevent fluctuations of product shrinkage, to prevent stripping deformation to improve the accuracy of the mold manufacturing, reduce errors and prevent mold precision change, a series of manufacturing process requirements and solutions.
3, here to mention the size of the error related to forming parts of the British Plastics Federation (BPF), the reasons for its proportion of the distribution:
A: The mold manufacturing error of about 1/3 B, the error caused by mold wear 1/6C by the inconsistency of forming pieces of uneven shrinkage error caused by about 1/3 D pre-shrinkage and shrinkage error of about 1/6
The total error = A + B + C + D, and therefore visible mold manufacturing tolerances of formed parts dimensional tolerance of 1/3, or the mold is difficult to guarantee the geometry of the forming parts.
Three are normally produced control
Plastic parts forming the geometric size of the fluctuations is a common problem, and is a frequently occurring phenomenon:
A melt temperature, mold temperature control, different grades of plastic necessary for the different temperature requirements, plastic liquidity and the use of more than two kinds of mixture will not happen, it should be plastic timber control in the best flow within the range of values, these are usually easy to do, but the mold temperature control is more complex, forming different pieces of geometry, size, wall thickness ratio of the different cooling deserves systems have certain requirements, mold temperature to a large extent control the cooling time, so try to make the mold to maintain low temperature can be allowed, in order to shorten the injection cycle, improve production efficiency, mold temperature changes, then the shrinkage will change the mold temperature to remain stable, dimensional accuracy is also stable , thereby preventing the deformation of the formed parts, bad luster, cool spots and other defects, the physical properties of plastics at its best, of course, there is a debugging process, especially in multi-cavity mold forming parts is more complex.
2, the pressure and exhaust adjustment control:
The injection pressure and clamping force of the match should be determined in debugging the mold in the mold cavity and core formation of the gap in the air and plastic gas from the exhaust ducts discharge the mold, such as row gas poor filling insufficient to produce a weld or burn, these three forming defects sometimes occasionally appear in the same area, forming wall portion of the parts book, surrounded by thick-walled exist, the mold temperature is too low there will be lack of filling and the mold temperature is too high you will burn phenomenon, usually in the burned area would appear to weld exhaust ducts are often neglected, are generally in a small state, usually does not produce a flash row the depth of the gas shroud as deep, the back of the shroud to open a larger ventilation slots in order to rapidly excreted through the shroud of gas can mold, special needs when in the open exhaust ducts on the mandrel, truth is the same, one does not waste side, two outlet fast well play an effect on the line.
3, injection molding to size supplementary shaping control
Some plastic parts after ejection due to the different shapes and sizes, with temperature and loss of pressure changes will occur in different situations the deformation warp, when some auxiliary fixture to be adjusted, in the shape of the pieces of the mold in a timely manner to take prompt remedial measures, let it will be able to achieve better correction after natural cooling setting, adjust the effect. If the entire injection molding process to ensure strict management, the size of the injection molding is the ideal control.
PRM Industry is a highly professional Plastic, Rubber and Metal product manufacturing group. We specialize in providing our customers the integrated solutions of plastic, rubber and metal products. With more than 30 years manufacturing experience, we have been doing, and we also own the capabilities to do, is listening to what our customers need and supplying them the best solutions.
Very attractive and well described post. There has been a steady advancement in the whole mold making industry. If you can share any articles related to How does the Mechanism of customized molds work, it will be grateful. Thanks for such an informative post.
ReplyDeleteI have been reading your blog its very nice information about control technology of plastic injection molds. Anole is the largest Temperature Controller Manufacturers and distributor in the China.
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