In the production process of metal products, metal forming technology plays a crucial role. Among them, sheet metal processing is a common metal forming method, which covers a variety of processes such as metal deep drawing and metal stamping. Metal deep drawing is the process of stretching the sheet through the deep drawing die to form the desired shape, while metal stamping is the use of stamping dies to pressure process the sheet to achieve the molding of the product. In this process, the application of stamping dies and progressive stamping dies is especially critical.
Stamping dies will often wear out in the production process, so how to improve the durability of stamping dies? According to the professional experience, here to share:
Stamping die is a necessary process equipment in the stamping production process, which has a decisive role in improving the quality of the product, prolonging the life of the product and improving 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 die 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 the stamping die must choose a good material. toolox series of materials, is a kind of 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 the 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 1.8 mm. Toolox series materials have the above characteristics, the material is very pure, the grain size is very small, S, P content is very small, the precipitation carbide content is small, and very uniform. The above characteristics make Toolox series materials have special advantages in the application of some stamping molds.
1) Stamping dies for thicker steel plates (typical case thickness is 35mm), stainless steel plates, and non-ferrous metal plates, such as air-conditioner fin dies.
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 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 dies, it is necessary to reasonably master 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 high toughness of the base material, with the surface layer of high hardness, can achieve excellent results.
Reasonable arrangement of stamping mold manufacturing process and ensure the processing accuracy
The processing accuracy of stamping die has great influence on the durability of stamping die. Such as in the blanking die due to uneven assembly clearance, under the action of shear force will often make the concave 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 level of the working part, the higher the durability of the stamping mold.
Correct selection of presses
In order to improve the durability of the stamping die, should be selected with high precision and high rigidity of the press, and make its stamping tonnage is greater than thirty percent of the punching force. Normally, the use of servo presses can correspondingly improve the life of the mold in several times to dozens of times.
Reasonable use and maintenance of stamping dies
In order to improve the durability of the stamping die, the operator must reasonably use and maintain the stamping die, the stamping die should be frequently repaired, in order 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 can not only make the stamping die service life increase, reduce the cost of production of mold enterprises, but also ensure that the production of products out of the quality of the product, improve production efficiency.