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Five steps of the production process of injection mold

Posted by admin on July 25th, 2015

First, the plastic products process analysis.
Before mold design, designers should fully study the plastic injection molding compliance principle, it requires careful consultation with the product designers, consensus analysis. Including on the product geometry, dimensional accuracy and appearance requirements, necessary discussion, to avoid unnecessary complexity mold.
Second, the mold design.
A set of high-quality mold, not only have good processing equipment and skilled manufacturing workers die, another very important factor is to have a good mold design, especially for complex mold, mold design quality mold quality accounted for 80 % the above. A good mold design is: meet the request of the premise, so low cost, small processing difficulty, processing time is short. To achieve this, not only to fully digest request of the guests, but also on the injection molding machine, mold structure, process and die plant’s own processing capacity to understand. Therefore, to improve the level of mold design, you should do the following:
1. understand each mold design every detail, to understand the purpose of each part of the mold.
2. In the design of multi-reference previous similar designs, and understand the situation in its tooling and production time, draw up the experience and lessons learned.
3. To learn more about the working process of the injection molding machine, in order to deepen the relationship between the mold and the injection molding machine.
The factory for processed products under process, understanding the features and limitations of each processing.
5. Understand your own design of the mold die tryout results and change the situation, learn from it.
6. designed to maximize the use of previously successful mold structure.
7. mold into a better understanding of the effect of water on the product produced.
8. Research special mold structure, the latest tooling technology.
Third, in determining the mold material and selection of standard parts.
In the selection of mold material, in addition to considering the accuracy and quality of the product, but also the actual capacity of processing and heat treatment combined with mold factory to give the right choice. In addition, in order to shorten the manufacturing cycle, as much as possible the use of existing standard parts.
Fourth, parts machining and mold assembly.
In addition to precision molds in the design of the structure and give the best reasonable tolerances beyond, spare parts processing and mold assembly is essential. Therefore, the selection and processing method precision absolute dominant position in the mold manufacturing. Size error molded article consists of the following components:
1. The mold manufacturing error of about 1/3
2. die wear caused by error of about 1/6
3. moldings uneven shrinkage resulting error is about 1/3
Error 4. Book shrinkage and actual shrinkage inconsistent generated approximately 1/6
Total Error = (1) + (2) + (3) + (4)
Therefore, in order to reduce the mold manufacturing error, we must first improve the precision, with the use of CNC machine tools, this problem has been well controlled. In order to prevent mold wear, deformation caused by an error in the processing of high precision molds and products yield greater when its cavity, core and other key parts should be quenched. In the large mold in order to save material and ease of processing and heat treatment, mold design should maximize the use of spell insert structure. In order to solve as a mold for manufacturing tolerances, which aims to shrink unevenly shaped pieces and error predetermined shrinkage and actual shrinkage inconsistency generated when the mold is generally used in products manufacturing tolerances of 1/3, in order to leave later than the molding process a large room for adjustment, in order to resolve the error caused by the molding process.
Fifth,  test mode.
A mold starting from design to assembly is completed, but completed 70% to 80% of its entire manufacturing process. For reservations shrink error inconsistent with the actual shrinkage resulting smooth stripping or not, how the cooling effect, especially in the gate size, position and shape affect the accuracy and appearance of products and so on, must be tested by the test mode. Therefore, test mode is an essential step to verify that mold and select the best qualified molding process.

Posted by Hillary

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