Dealing with the problem of strains in the drawing die and workpiece forming process should be based on the basic principle of reducing adhesion and wear, and the nature of the touch pair should be modified as a starting point. drawing die
1. The original data of the formed workpiece
After the surface treatment of the original materials, such as phosphating, spraying or other surface treatments on the original materials, the surface of the formed materials forms a non-metallic drawing die layer, which can greatly reduce or eliminate the strain on the workpiece. This method is often The cost is relatively high, and additional production equipment and production processes are required. Although this method is sometimes useful, it is rarely used in practice.
2. Between the workpiece and the drawing die
Adding a layer of PVC or other film between the drawing die and the forming material can sometimes deal with the problem of strain on the workpiece. Regarding the production line through the organization, it can reach the continuous supply of film. Regarding the periodic production of stamping equipment, a piece of film needs to be added for each workpiece produced, which affects the production power. This method is usually expensive and will produce a lot of waste. It is advisable to use this method for the production of large batches of large workpieces.
In some occasions where the forming load is very small, sometimes the problem of strain on the workpiece can be dealt with by adding lubricating oil or adding EP increasing agent lubricating oil.
3. Mould
After modifying the convex and concave ink materials of the drawing die or the appearance of the convex and concave drawing dies of the drawing die, the material and the convex and concave drawing dies are touched and changed. Practice has proved that this is an economical and useful method for dealing with strain problems, and it is also a widely used method at present.
To sum up, there are many ways to deal with the problem of surface strain on the convex and concave drawing dies of the workpiece and the drawing die. For detailed cases, the method should be selected according to the size of the workpiece and the load, the production batch, and the variety of processed materials. Among all the methods for dealing with strain problems, it is best to use cemented carbide as the drawing die material, chemical vapor deposition on the surface of the drawing die convex and concave drawing die, and TD coating treatment. In the meantime, TD cladding treatment is the most cost-effective.
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