With the continuous improvement of people's aesthetic concept, multi color

Plastic mold has become a very popular plastic mold product. Now let's learn the general steps of two color injection molding. First, process analysis of plastic products.

Before mold design, designers should fully analyze whether plastic products conform to the principles of injection molding. It is necessary to negotiate and reach agreement with the product designer. The geometry, dimensional accuracy and appearance requirements of the product are discussed. Two, mold structure design.

A set of high-quality molds, not only need good processing equipment and skilled two-color injection molding workers, but also a very important factor is to have a good mold design, especially for complex molds, mold design quality accounted for more than 80% of the mold quality. Good mold design is: under the premise of meeting customer requirements, low processing cost, processing difficulty is small, processing time is short. To do this, we should not only fully understand the requirements of customers, but also understand the injection molding machine, processing technology, mold structure and mold factory's own processing capacity. Therefore, in order to improve the mold design level, we should do the following:

1. Understand every detail of each mold design and understand the purpose of each part of the mold.

2. Referring to similar designs in the past, understand the mold processing and product production, and learn from them.

3, understand the working process of injection molding machine, and deepen the relationship between mold and injection molding machine.

4, understand the next factory processing technology, understand the characteristics and limitations of each process.

5, understand your own mold test results and mold changes, and learn from them.

6, in the design, we should adopt the successful mold structure as far as possible.

7, learn more about the impact of mold water on products.

8, research some special mold structure, understand the latest mold technology. Three, confirm mold materials and select standard parts.

In the choice of mold materials, besides considering the precision and quality of the products, we also need to combine the actual processing capacity and heat treatment capacity of the mold factory to make the correct choice. In addition, in order to shorten the production cycle, we should make full use of the existing standard parts.

Parts processing and mold assembly.

In addition to the optimal structure and reasonable tolerances, the accuracy of injection mold is also important. Therefore, the choice of machining accuracy and processing methods occupy an absolute leading position in two-color injection molding. The size error of mold is mainly composed of the following parts:

1. The error of mold manufacturing is about 1/3.

2, the error caused by die wear is about 1/6.

3, the error caused by uneven shrinkage is about 1/3.

4, the difference between predetermined shrinkage and actual contraction is about 1/6.

5. Mold testing.

From the beginning of the assembly to the end, a set of molds was designed, and only 70% to 80% manufacturing processes were completed. There is no cooling effect that does not match the actual shrinkage phase and actual shrinkage conditions, especially the effect of door position, size, shape accuracy, product appearance, must be verified by test. Therefore, mold testing is the key step to check whether the mold is qualified and choose the best molding process.