How to choose the press tool material

The selection of press tool materials should consider the use requirements of stamping parts, stamping process requirements and economy.

(1) Select press tool materials reasonably according to the use requirements of stamping parts
The selected materials shall enable the stamping parts to work normally in the machine or components and have a certain service life. Therefore, according to the service conditions of stamping parts, the selected materials should meet the requirements of corresponding strength, stiffness, toughness, corrosion resistance and heat resistance.

(2) Reasonable press tool material selection according to stamping process requirements
For any kind of stamping parts, the selected materials shall be able to stably form qualified products without cracking or wrinkling according to the requirements of stamping process, which is the most basic and important material selection requirement. Therefore, the following methods can be used for reasonable material selection.

① Test run(press tool material). According to the previous production experience and possible conditions, several sheets that can basically meet the use requirements of stamping parts are selected for trial punching, and finally the one with no crack or wrinkle and low scrap rate is selected. The result of this method is intuitive, but it has great blindness.

② Analysis and comparison. Based on the analysis of stamping deformation properties, the maximum deformation degree during stamping forming is compared with the allowable limit deformation degree of sheet metal stamping forming performance, and based on this, the sheet metal suitable for the stamping process requirements of this kind of parts is selected.

In addition, plates of the same brand or thickness can be divided into cold rolling and hot rolling. In China's domestic plates, thick plates (T > 4mm) are hot-rolled plates, and thin plates (T < 4mm) are cold-rolled plates (also hot-rolled plates). Compared with hot rolled plate, cold rolled plate has accurate size, small deviation, less surface defects, brightness, dense internal structure and better stamping performance. (Note: t generally represents the thickness in the mold, for example, the thickness of the template and the thickness of the material can be expressed by T.)

(3) Reasonable material selection according to economic requirements
On the premise of meeting the service performance and stamping process requirements, the selected materials shall be as low as possible, with convenient source and good economy, so as to reduce the cost of stamping parts