Dealing with the strain problem in the whole process of the tungsten steel material drawing die and workpiece forming should be based on the basic principles of reducing adhesive wear and changing the characteristics of the contact pair. The following three parties constitute the pair of touch pairs, namely the raw material level of the formed workpiece, the middle of the workpiece and the mold, and the mold level respectively.

1. The raw material level of the formed workpiece

According to the metal surface treatment of the raw material, such as phosphating, electrostatic spraying or other metal surface treatment on the raw material, a non-metallic material mold layer is formed on the surface of the formed raw material, which can greatly relieve or remove the strain on the workpiece This type of method is usually costly, and additional production equipment and production process flow must be added. Although this type of method sometimes has some practical effects, it is rarely used in specific production.

2. Between the workpiece and the mold

Adding a layer of plastic film such as PVC between the mold and the forming material can sometimes deal with the problem of strain on the workpiece. According to the organization, the production line can continue to provide plastic film, and for the punching machine tool produced in the cycle time, a plastic film is added for each workpiece produced, which jeopardizes the high production efficiency. This method is generally costly and will continue. A lot of waste is produced, and this type of method is available for the production of large and medium-sized workpieces produced in batches.

In some places where the forming load is not large, sometimes the strain problem of the workpiece can be dealt with by adding grease or grease with EP preservative.

3. Mold level

According to the change of the mold convex and concave ink raw materials or the metal surface treatment of the mold convex and cavity, the contact characteristics of the raw material and the convex and cavity are changed. Practical experience shows that it is a reasonable way to deal with strains and economic development, and it is also a commonly used method at this stage.