Stamping die is a necessary process equipment in the metal stamping production process, which plays a decisive role in improving the quality of the product, prolonging the product life and increasing the production efficiency. However, due to the stamping die in the production process due to frequent wear and tear and lose working size, resulting in difficult to meet the production demand. Therefore, it is critical to improve the durability of stamping dies. Here are several ways to improve the durability of stamping dies.
Improve the design of stamping molds
Whether the design of stamping die is reasonable or not is the basis for improving the durability of stamping die. Therefore, in the design of stamping die should be formed in the product adverse conditions to take effective measures to improve the durability of the stamping die, such as the design of small hole stamping die life is often manifested in the punching of small holes on the convex die. For this type of stamping die, in the design should make the small convex die to shorten its length as much as possible, in order to increase the strength, at the same time, should also be used to guide the sleeve method to strengthen the small convex die for protection. In addition, in the stamping die design, should take into full account the form of the mold frame, the fixing method and guiding form, the pressure in the determination and the rigidity of the upper and lower templates and other factors. Especially for the blanking die, the selected clearance value has a great influence on the durability. In the design, the gap of the stamping die should be selected reasonably, and its gap value should not be too small, otherwise it will affect the service life and durability of the stamping die. Practice has proved that in the case of not affecting the quality of stamped parts, the appropriate enlargement of the gap can greatly improve the durability of the stamping die, and sometimes even increase several times and dozens of times.
Correct selection of stamping mold materials
Different stamping die materials have different strength, toughness and wear resistance. Under certain conditions, the use of advanced materials can increase the durability several times. Therefore, in order to improve the durability of stamping dies, it is necessary to choose good materials.
Toolox series of materials, is a high toughness, high wear resistance, basically no internal stress of a new type of pre-hardened tool steel and has a very high purity, grain size is often fine, S, P content is very small, precipitation of carbide content is small, and very uniform. Due to the special composition design, Toolox series materials have excellent surface treatment performance, of which Toolox44 nitrided surface hardness can reach HRC65 or more, Toolox40 surface hardness can reach HRC62 or more, Toolox33 surface hardness can reach HRC58 or more, the depth of up to 1.8mm.
The above characteristics of Toolox series materials make Toolox series materials have special advantages when applied to some stamping dies.
1) Thick steel plate (typical case of punching thickness of 35mm steel plate), stainless steel plate, as well as non-ferrous metal plate stamping molds, a typical air conditioner fins mold.
2) Stretching mold, stainless steel stretching mold.
3) Cold extrusion mold. Cold extrusion of 304 stainless steel, thickness of 0.5mm or more, instead of DC53 and other materials, the effect is very good.
4) High dimensional stability requirements of large stamping templates.
Reasonable forging and heat treatment of stamping die parts
In the selection of high-quality stamping die materials at the same time, for the same material and different properties of the material requirements for reasonable forging and heat treatment is to improve the durability of the stamping die is one of the main ways. For example, quenching, if the production of overheating in the heating, not only will make this workpiece too brittle, and in the cooling easily cause deformation and cracking, so that the durability is reduced. Therefore, in the manufacture of stamping die, must be reasonable grasp of the heat treatment process. Toolox material is directly pre-hardened by the steel mill quenched and tempered steel, no longer need heat treatment, with the appropriate surface treatment (such as nitriding), Toolox base material of high toughness, with the surface layer of high hardness, can achieve excellent results.
Reasonable arrangement of stamping die manufacturing process and ensure processing accuracy
Stamping die processing accuracy on the durability of the stamping die has a great impact. Such as in the blanking die due to uneven assembly clearance, under the action of shear force will often make the die gnawing bad and affect the life of the stamping die. At the same time, the surface finish of the stamping die is too low, which will also reduce the durability of the stamping die. Therefore, in the processing must be on the hole distance size, assembly of the convex die on the verticality of the fixed plate support surface, stamping die spacing uniformity and guide bushings, guide pillar guiding accuracy level to give full attention to. The higher the manufacturing and assembly precision and the higher the surface roughness grade of the working part, the higher the durability of the stamping die.
Correct selection of presses
In order to improve the durability of the stamping die, should choose a higher precision and higher rigidity of the press, and make its stamping tonnage is more than thirty percent of the press force. Normally speaking, the use of servo press can correspondingly improve the life of the mold in several times to dozens of times.
Reasonable use and maintenance of stamping die
In order to improve the durability of the stamping die, the operator must be reasonable use and maintenance of stamping die, stamping die should be frequently repaired to prevent the stamping die with disease work.
Above is what we organize to improve the wear resistance of stamping die a few common methods to improve the significance of wear resistance not only to increase the service life of the stamping die, reduce the production cost of the mold enterprise, but also to ensure that the quality of the products produced, improve production efficiency.