Plastic mold -- three manufacturing steps

With the continuous improvement of people's aesthetic concepts, plastic mold has become a very popular plastic mold product. Now let's learn the general steps of injection molding.

Process analysis of plastic products.

Before mold design, the designer should fully analyze and study whether the plastic products conform to the principle of injection molding. It is necessary to negotiate and reach an agreement with the product designer. The geometric shape, dimensional accuracy and appearance requirements of the product are discussed.

Mold structure design.

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

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

2. During design, refer 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 processing process of the next factory, and understand the characteristics and limitations of each process.

5. Understand the test results and changes of your own mold design, and learn from them.

6. Try to use a successful mold structure in the design.

7. Learn more about the impact of mold water on products.

8. Study some special mold structures and understand the latest mold technology.

Determine the mold material and select the standard part.

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

Part processing and mold assembly.

In addition to the optimal structure and reasonable tolerance, the precision of the injection mold is also very important. Therefore, the selection of processing accuracy and processing methods play an absolutely dominant role in two-color injection molding. Die size error mainly consists of the following parts:

1. The mold manufacturing error is about one third.

2. The error caused by die wear is about one sixth.

3. The error caused by uneven shrinkage is about one third.

4. The error caused by the difference between the scheduled shrinkage and the actual shrinkage is about one sixth.

5. Mold test.

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