Problems and solutions in thick plate stamping

The main problems existing in thick plate stamping at present: (l) The punching surface of the stamping parts is rough or even uneven. The size and shape accuracy of the punching parts are low, and the blanking has obvious arch and bending deformation. The low quality of stamping parts seriously affects the popularization and application of this process. How to improve the quality of thick plate stampings is a key issue to be discussed urgently. (2) The die life is low, especially for punching hard steel or thick sheet materials, the die life is lower. This hinders the promotion of this process. (3) There are still some problems to be further explored in the process, such as: the pre-processing and preparation of raw materials, including leveling, blanking and spheroidizing annealing treatment, cleaning, lubrication, and the preparation of strips, sheets, and blocks. For general factories, restricted by equipment conditions, coupled with immature technology, there will be some difficulties. (4) The determination of the stamping process and the design and manufacture of die structure, including the material selection and heat treatment of the working parts of the die, have yet to be explored. (5) The research on the theory of thick plate stamping technology has not yet been put on the agenda. For example, effective measures to improve the quality of thick plate blanking, reduce the pressure of thick plate blanking, reduce the noise of thick plate punching, and popularize thick plate thermo-clean blanking technology, etc., all need to be studied specifically to guide factory practice. It should be pointed out that thick plate stamping is a modern stamping technology with great potential, excellent benefits and extremely broad prospects. Its development and popularization depend on the development and progress of material technology, die technology, stamping equipment production technology and related basic process technology. Therefore, the development and application of thick plate stamping technology is actually a systematic engineering involving many basic process technology fields, and it is a long-term and arduous key research topic of modern stamping technology. The cold-drawn thick steel plate has a larger value due to the cold shear strength of the material. When the material thickness t reaches 4-20mm, the P~ value increases in proportion to the increase in the value of t during blanking. The convex and concave dies made of conventional cold stamping die materials are difficult to withstand the excessive compressive stress during punching. Sometimes the value of P, two will exceed the tonnage of the field equipment and cannot be cold stamped. The use of hot stamping thick steel plate can reduce the punching force. After the steel plate is heated, its shear strength a is significantly reduced, and the Pmax value is greatly reduced, which provides superior conditions for thick plate stamping. However, heating the steel plate requires certain heating equipment, and it is not suitable to use a mechanical press for hot punching. Because hot stamping must strictly control the heating temperature, and clean the rust and oxide scale on the surface of the hot plate before stamping, the hot stamping equipment should also be suitable for the unloading and cooling of hot stamping parts, and the unloading and stacking of hot waste. Therefore, based on practical experience, it is more appropriate to use a friction press for hot stamping of thick steel plates. Previous post: Advantages of SKH-9 die steel as a stainless steel cold stamping die material