What are the precautions for plastic mold manufacturing

For ordinary people, a mold may be considered a relatively simple thing, but it is not. Any mold design, development and manufacturing is a complicated process. There are many things to go through from drawings to products, and there are also things to pay attention to. Much. Today, the engineers from Wo Neng Precision will come to you to talk about the matters that should be paid attention to in the process of designing, developing and manufacturing a mold.

First, in the selection of mold manufacturing materials, it is necessary to choose the appropriate mold steel.

The criteria for selecting steel are:

1. Requirements for injection molding materials: Different plastics should use different steel materials, such as the requirements for high polishing, corrosion resistance, etc.;

2. Price: It is good that the steel properties can be used, not the more expensive the better;

Considering the cost factor of the mold, the mold steel should be selected according to the life of the mold to avoid unnecessary waste; generally, the life of P20 is 30

About 10,000; 2738, 500,000 is no problem, H13/2344 is usually in

More than 800,000-1 million, can be selected according to the situation;

3. Heat treatment. The surface treatment of the mold is also very important. Nitriding—can enhance the surface hardness of steel and effectively prolong the life of the mold; electroplating—can effectively modify the mold steel, and electroplating can be used to enhance and improve the performance of steel for some plastic parts that require high brightness and corrosion resistance.

2. Mold and structure design

The mature mold structure not only takes into account the product material properties - shrinkage rate, molding temperature, elastic tensile deformation coefficient, etc., but also takes into account the cooling water channel, the speed of opening and closing the mold, etc. A reasonable mold structure can effectively prolong the life of the mold and ensure the smooth production of the mold. Improve efficiency and reduce costs.

3. Mold processing

If a worker wants to do a good job, he must first sharpen his tools. The arrangement of the mold process is particularly important. A reasonable process arrangement can speed up the production cycle, shorten the processing time, and effectively save costs. And more importantly, accurate and reasonable processing can ensure the stability and prolong the life of the mold in the production process.

Some processing errors will lead to mold welding. No matter how good the welding is, it is a loss to the mold; poor processing may affect the movement of the mold, reduce the life of the mold, and cause the mold to crack or even crack during the production process. break off.

4. Polishing/skin texture

The polishing of the mold is the last link in the mold manufacturing. The polish is reflected directly on the plastic part, which is a face job. Polishing can also help and supplement the mold action, especially for demoulding. Often the production of some molds is not smooth because of insufficient lighting, excessive resistance, difficulty in demoulding, and even top whitening and cracking.

Fifth, the later maintenance of the mold should be done well.

All mechanical equipment needs to be maintained, and the same is true for molds. They need to be maintained during and after use.

Good maintenance, especially the parts that are prone to rust, should be well protected, otherwise rust may cause the mold to be unusable.

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