Third, ways to improve the durability of the die
1. Improve the design of the die
Whether the die design is reasonable is the basis for improving the durability of the die. Therefore, in the design of the die, effective measures should be taken to deal with the unfavorable conditions in the forming of the product to improve the durability of the die. For example, the life of the designed small hole die is often expressed on the punch of the punched hole. For this type of die, the small punch should be shortened as much as possible to increase the strength. At the same time, the small punch should be strengthened by the guide sleeve. In addition, in the design of the die, the form of the formwork, the fixing method and the guiding form of the convex and concave die, the determination of the pressure center, and the rigidity of the upper and lower templates should be fully considered. Especially for the punching die, the selection of the gap value has a great influence on the durability. In the design, the gap of the die should be selected reasonably, and the gap value should not be too small, otherwise it will affect the service life and durability of the die. Practice has proved that, without affecting the quality of the stamping parts, properly amplifying the gap can greatly improve the durability of the die, sometimes even several times and several times.
2, the correct choice of die material
Different die materials have different strength, toughness and wear resistance. Using advanced materials under certain conditions can increase durability several times. For example, the galvanic sheet punching die made of T10A steel has a much lower grinding life than the similar die made of Cr12 and Cr12 MoV. The average grinding life of G35 titanium carbide hard alloy is 5-10 times higher than that of Cr12 steel die. The use of tungsten-cobalt cemented carbide as the same convex and concave mold material is better than Cr12 steel. 20-30 times. Therefore, in order to improve the durability of the die, it is necessary to select a good material.
3. Reasonable forging and heat treatment of die parts
While selecting high-quality die materials, reasonable forging and heat treatment of materials of the same material and different properties are one of the main ways to improve the durability of the die. For example, when quenching, if the production is overheated during heating, not only the workpiece is too brittle, but also causes deformation and cracking during cooling, resulting in reduced durability. Therefore, in the manufacture of the die, the heat treatment process must be properly grasped.
4. Reasonable arrangement of die manufacturing process and guarantee of machining accuracy
The machining accuracy of the die has a great influence on the durability of the die. For example, in the blanking die, due to the uneven assembly gap, the die is often damaged by the shearing force and affects the die life. At the same time, the surface finish of the die is too low, which will also reduce the durability of the die. Therefore, it is necessary to pay sufficient attention to the hole distance, the perpendicularity of the punch to the support surface of the fixed plate during assembly, the uniformity of the die spacing, and the guiding precision of the guide bush and the guide post. The higher the manufacturing and assembly accuracy and the higher the surface roughness level of the working part, the higher the durability of the die.
5, the correct choice of press
In order to improve the durability of the die, a press with higher precision and higher rigidity should be selected, and the punching tonnage should be greater than 30% of the punching pressure.
6, reasonable use and maintenance of the die
In order to improve the durability of the die, the operator must use and maintain the die reasonably. The die should be repaired frequently to prevent the die from working.
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