Method For Solving The Problem Of Tensile Mold Strain

Solving the problem of strain in the mold and workpiece forming process should be based on the basic principle of reducing adhesive wear, and changing the nature of the contact pair as a starting point. Hereinafter, the three sides of the pair of contact pairs are formed, that is, the raw materials of the formed workpiece, the workpiece and the mold, and the mold are separately analyzed.

1.Mold aspect

The contact properties of the stretched material with the convex and concave molds are changed by changing the convex or concave mold material of the mold or by surface-treating the convex or concave mold or by selecting a suitable mold material. Practice has proved that this is an economical and effective method to solve the problem of strain, and it is also a widely used method.

The standard heat treatment process is also a problem at present. For the structure of the drawing die and the mechanical properties of the die steel, heat treatment is required, especially for large and complex tensile members, and the size of the heat-treated workpiece is placed in the furnace. The process of uniform and reasonable heating has high requirements, dimensional deformation and cracking often occur, and the higher hardness increases the difficulty and cycle length for the subsequent processing, thereby increasing the cost.

2. Raw material aspects of the formed workpiece

By surface treatment of the raw materials, such as phosphating, spraying or other surface treatment of 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 of the workpiece. This method is often cost-effective. High, and need to add additional production equipment and increase production processes, although this method sometimes has some effects, and there are few applications in actual production.

3. Between the workpiece and the mold

A film of PVC or the like is added between the mold and the forming material, and sometimes the problem of strain on the workpiece can be solved. For the production line through the mechanism can achieve continuous supply of film, and for the cycle production of stamping equipment, each piece of workpiece needs to add a film, affecting production efficiency, this method is generally costly, and will also produce a large amount of waste, for small batches It is advisable to use such a method for the production of large workpieces.

In some cases where the forming load is small, the problem of strain on the workpiece can be solved by adding lubricating oil or lubricating oil with EP additive.

In summary, there are many methods for solving the problem of scratching the surface of the workpiece and the convex and concave molds. For specific cases, the application method should be selected according to the size of the workpiece and the load, the production batch, the type of the material to be processed, and the like.

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