1、 Basic principles for selecting stamping materials:
In stamping production, the following basic principles should be followed when selecting raw materials for stamping parts.
1. Stamping die steel shall have usability to ensure the function of parts after stamping.
2. The materials shall have good universality of processing technology, and the selected materials shall adapt to the characteristics of stamping process and be easy for stamping.
3. The materials shall be easy to process, stable in forming, easy to obtain high-quality and high-precision stampings, and shall reach the number of stampings with specified burr height, so as to avoid waste products.
4. The material shall have good mechanical properties, and wear of the die shall be small during the stamping process to ensure the service life of the die.
5. The deformation degree of materials shall be large enough to minimize the number of processes in the stamping process and the number of auxiliary processes such as heat treatment softening, so as to improve labor productivity.
6. The cost performance ratio of materials shall be selected as far as possible to ensure the quality without affecting the service performance of parts. In mass production or mass production, the cost of materials accounts for about 80% of the cost of stamping parts. It can be seen that the price of materials is also proportional to the material.
2、 Quality requirements for selecting stamping die steel for stamping:
When selecting materials for stamping, in addition to meeting the requirements of material performance, product function, process performance suitable for stamping, and ease of forming, attention should be paid to the quality of materials themselves. The quality requirements for stamping materials mainly include the following aspects.
1. Stamping die steel should have good plasticity, that is, it should have higher elongation A and reduction of area Z, lower yield strength, and higher tensile strength. In this way, in the deformation process, the allowable deformation is large and the applied deformation force is small, which can reduce the number of processes and intermediate annealing, or it can not require intermediate annealing. It is conducive to the stability of the stamping process and the uniformity of deformation, improving the forming dimensional accuracy of the parts, improving the service life of the die, improving the yield and reducing the cost of the parts.
2. Stamping die steel shall have a smooth, flat, scratch free and rust free surface. The materials with good surface condition are not easy to scratch the mold during processing, and the parts are not easy to produce waste products.
3. The thickness tolerance of materials shall comply with the national standards. Because a certain material gap is suitable for materials of a certain thickness, the material thickness tolerance is too large, which will not only affect the quality of the parts, but also may lead to waste products and damage to the mold.
4. The materials shall have good adaptability to mechanical joint and continuous processing (such as welding, electroplating, polishing and other processes).
5. The width size and straightness (sickle bend) of the stamping die steel shall strictly control the accuracy requirements for automatic stamping processing. To ensure that the automatic feeding can be carried out normally, and the material will not be blocked due to unqualified material width, which will affect the automatic and stable production.
6. Generally, the length of stamping die steel is not strictly required, but for automatic, large batch and high-speed stamping processing, the longer the strip is, the better, and no joint is allowed in the middle, otherwise the continuous operation will affect the production rate.
At the same time, the internal structure and chemical composition of the selected stamping die steel shall meet the corresponding standards.