News

Method for increasing service life of stamping die

update:03-04-2020
abstract:

Improve stamping die design Whether the design of the s […]

Improve stamping die design
Whether the design of the stamping die is reasonable is the basis for improving the durability of the stamping die. Therefore, when designing the stamping die, effective measures should be taken to improve the durability of the stamping die. For example, the life of the small hole stamping die is often expressed in the punching die. For this type of stamping die, the small punch should be designed to shorten its length as much as possible to increase the strength. At the same time, the guide sleeve should also be used to strengthen the small punch for protection. In addition, in the design of stamping dies, factors such as the form of the die frame, the fixing method and the guide form of the convex and concave dies, 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 choice of the gap value has a great influence on the durability. In the design, the gap of the stamping 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 stamping die. Practice has proved that, without affecting the quality of stamping parts, proper enlargement of the gap can greatly improve the durability of the stamping die, sometimes even several times and tens of times.

Correct selection of stamping die materials
Different stamping die materials have different strength, toughness and wear resistance. The use of advanced materials under certain conditions can increase the durability several times. Therefore, in order to improve the durability of the stamping die, a good material must be selected.
The Toolox series of materials is a new type of pre-hardened tool steel with high toughness, high wear resistance, and basically no internal stress. It also has a very high purity, very small grain size, and very high S and P content. Less, less precipitated carbide content, and very uniform. Due to the special composition design, Toolox series materials have very excellent surface treatment performance, of which Toolox44 surface hardness after nitriding can reach HRC65 above, Toolox40 surface hardness can reach HRC62 above, The surface hardness of Toolox33 can reach above HRC58 and the depth is up to 1.8mm.
The above characteristics of the Toolox series of materials make the Toolox series of materials have special advantages in the application of some stamping dies.
1) Thick steel plate (35mm steel plate with punching and shearing thickness in typical cases), stainless steel plate, and non-ferrous metal plate stamping molds, air conditioner fin molds are more typical.
2) Stretching mold, stainless steel stretching mold.
3) Cold extrusion die. Cold extrusion 304 stainless steel, thickness 0.5mm or more, replaces DC53 and other materials, the effect is very good.
4) Large stamping template with high dimensional stability requirements.

Reasonable arrangement of stamping die manufacturing process and ensure processing accuracy
The processing accuracy of the stamping die has a great influence on the durability of the stamping die. For example, due to the uneven assembly gap in the punching die, the die will often be bitten by the shear force and affect the life of the stamping die. At the same time, the surface finish of the stamping die is too low, which also reduces the durability of the stamping die. Therefore, we must pay full attention to the size of the hole pitch, the perpendicularity of the punch to the support surface of the fixed plate during assembly, the uniformity of the stamping die spacing, and the guide accuracy level of the guide sleeve and 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 stamping die.