Specific solutions to stretch mold strains

Specific problems are analyzed in detail, and there are specific methods for solving tensile mold strains. In the forming process, the basic principle of reducing adhesive wear should be followed, and the nature of the contact pair should be changed as the starting point. Special treatment is given to the raw materials of the formed workpiece, between the workpiece and the mold, and the mold.

The first is the raw material aspect of the shaped workpiece. By surface treatment of the raw materials, such as phosphating, spraying or other surface treatments on the raw materials, a non-metallic mold layer is formed on the surface of the formed material, which can greatly reduce or eliminate the strain on the workpiece. This method is often more costly. High, and need to add additional production equipment and increase the production process, although this method sometimes has some effect, the actual production application is very few.

Adding a layer of PVC film between the workpiece and the mold can sometimes solve the problem of strain on the workpiece. For the production line, the continuous supply of film can be achieved through the mechanism, and for the periodic production of stamping equipment, a film needs to be added for each workpiece produced, which affects production efficiency. This method is generally costly and produces a large amount of waste. For small batches It is advisable to use this method for the production of large-scale workpieces. In some occasions where the forming load is very small, sometimes the strain problem of the workpiece can be solved by adding lubricating oil or adding EP additive lubricating oil.

Actually, it has been proved that the widely used method is to change the convex and concave ink materials of the mold or to perform surface treatment on the convex and concave molds to change the contact properties of the material and the convex and concave molds.

To solve the problem of surface strain on the convex and concave molds of the workpiece and the mold, the corresponding method should be selected according to the actual situation. Such as the size of the workpiece and the load, the production batch, the type of material to be processed, etc., select the application method. Among all the methods to solve the strain problem, it is best to use cemented carbide as the mold material and chemical vapor deposition and TD coating treatment on the convex and concave surfaces of the mold. Among them, TD cladding is the most cost-effective.