First, plastic products process analysis.
Before mold design, designers should fully study its plastic injection molding processing Meets principle, requires careful consultation with the designer products, have reached a consensus analysis. Including on the product geometry, dimensional accuracy and appearance requirements, necessary discussion to avoid unnecessary mold manufacturing complex.
Second, the mold design.
A set of high-quality molds, not only need to 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 is good or bad quality of the mold accounted for 80 %the above. A good mold design is: under the premise to meet the request, so that 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 and mold processing plant processing capacity of their own understanding. 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 mold part.
2. In the design of multi-reference previous similar designs, and understand it in the case of mold processing and production time, which draw on 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.
4. Learn processed at the plant process, understanding the characteristics and limitations of each processing.
5. Understand your own design of a mold die tryout results and change the situation, learn from it.
6. designed to maximize the use of previously successful mold structure.
7. A better understanding of the effect of water on the mold produced products.
8. Research special mold structure, the latest tooling technology.
In determining the selection of materials and mold standard parts.
In the selection of mold material, in addition to considering the accuracy and quality of the products, but also combined with the actual capacity of processing and heat treatment mold factory to give the right choice. In addition, in order to shorten the manufacturing cycle, possible use of the existing standard.
Fourth, parts machining and mold assembly.
In addition to the accuracy of the mold structure designed to give the best fit with a reasonable tolerance outside parts processing and mold assembly it is essential. Therefore, the selection and precision machining processing method has an absolute dominant position in the mold manufacturing. Molded article dimensional errors mainly by the following components:
1. The mold manufacturing error becomes approximately 1/3
2. die wear caused by error of about 1/6
3. The molded article produced uneven shrinkage error is about 1/3
4. Error predetermined shrinkage and actual shrinkage inconsistent generated approximately 1/6
Total Error = (1) + (2) + (3) + (4)
Therefore, in order to reduce the mold manufacturing error, it should first improve the precision, with the use of CNC machine tools, this problem has been well controlled. In addition, in order to prevent mold wear, deformation caused by the error in the processing of high precision products and larger production molds when its cavity, core and other key parts should be hardened. In large mold in order to save material and facilitate processing and heat treatment, mold design should maximize the use of spell insert structure. In order to solve as a mold manufacturing tolerances, which aims to shrink molded parts and uneven shrinkage and actual shrinkage predetermined error inconsistency generated when the mold is generally used in manufacturing products 1/3 tolerance, 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.
Five test mode.
From the beginning to design a mold assembled, but the completion of 70% to 80% of its entire manufacturing process. For error predetermined shrinkage and actual shrinkage produced inconsistent smooth release or not, how the cooling effect, especially gate size, location, shape accuracy and appearance products on other issues, must be tested by the test mode. Therefore, test mode is an essential step to verify eligibility and selection of the best mold molding process.