Because the stamping die often loses its working size due to wear in the production process, it is difficult to meet the production requirements. Therefore, it is critical to improve the durability of stamping dies. This paper introduces several methods to improve the durability of stamping dies.
Several ways to help improve the durability of stamping dies
Improving the Design of Stamping Die
Whether the design of stamping die is reasonable is the basis of improving the durability of stamping die. Therefore, effective measures should be taken to improve the durability of the stamping die when designing the stamping die, such as designing the small hole stamping die
The life of the tool is often shown on the punch for punching small holes. For this kind of stamping die, the length of the small punch shall be shortened as much as possible during the design to increase the strength. At the same time, the guide sleeve shall be used to strengthen the protection of the small punch. this
In addition, in the design of stamping die, factors such as the form of die base, the fixing method and guiding form of male and female dies, the determination of pressure center, and the rigidity of upper and lower formworks shall be fully considered. Especially for the blanking die, the gap value is selected for the durability
It has a great impact. During design, the clearance of the stamping die shall be selected reasonably, and the clearance value shall not be too small, otherwise, the service life and durability of the stamping die will be affected. Practice has proved that proper enlargement is required without affecting the quality of stamping parts
The clearance can greatly improve the durability of the stamping die, sometimes even several times or dozens of times.
Correct selection of stamping die materials
Different stamping die materials have different strength, toughness and wear resistance. Under certain conditions, the use of advanced materials can improve the durability several times. Therefore, in order to improve the durability of stamping dies, good materials must be selected.
Toolox series material is a new kind of prehardened tool steel with high toughness, high wear resistance and basically no internal stress. It also has very high purity, very fine grain size, very little S, P content and precipitated carbide content
Less, and very even Due to the special composition design, Toolox series materials have excellent surface treatment performance. The surface hardness of Toolox44 after nitriding can reach above HRC65, and the surface hardness of Toolox40 can reach below HRC62
The surface hardness of Toolox33 can reach above HRC58 and the maximum depth is 1.8mm.
Reasonably arrange the stamping die manufacturing process and ensure the processing accuracy
The processing precision of stamping die has a great influence on the durability of stamping die. For example, due to the uneven assembly clearance in the blanking die, the female die is often gnawed under the action of shear force, which affects the life of the stamping die. At the same time, the surface of the stamping die is smooth and clean
If the degree is too low, the durability of the stamping die will also be reduced. Therefore, the size of hole spacing, the perpendicularity of the punch to the support surface of the fixed plate during assembly, the evenness of the spacing between the stamping dies, and the guide accuracy grade of the guide sleeve and the guide pillar must be fully specified during processing
Pay attention. The higher the manufacturing and assembly accuracy and the higher the surface roughness level of the working part, the higher the durability of the stamping die.
Correct selection of press
In order to improve the durability of the stamping die, the press with high accuracy and rigidity should be selected, and its punching tonnage should be more than 30% of the punching pressure. Normally, the service life of the die can be increased by several to dozens of times by using the servo punch.