November 23, 2023
Material requirements for the stamping process: when selecting materials for stamping, you should first meet the requirements for the use of stamping parts:
Stamping parts used on machines require materials with high strength and stiffness.
Some stamped parts on motors and appliances require good electrical conductivity and magnetic conductivity.
Stamping parts in automobiles and aircraft are required to have sufficient strength and reduce weight as much as possible.
Chemical containers require corrosion resistance, etc.
Different usage requirements determine the selection of different materials. However, considering the stamping process, the material should also be meet the stamping process requirements to ensure the smooth completion of the stamping process.
The requirements for materials used in stamping are:
(1) Good stamping performance
Stamping performance refers to the adaptability of sheet materials to various stamping processing methods. The stamping processing method is a processing method in which metal is plastic, so the material is required to have good plasticity. For the deformation process, if the plasticity is good and the material is required to allow a large degree of deformation, the number of stamping processes and the number of intermediate annealings can be reduced.
For the separation process, a certain degree of plasticity is also required, and the yield limit of the material is required to be slightly higher to facilitate obtaining higher section quality after blanking. The plasticity of the material is commonly expressed by elongation (ǒ) and yield strength σs. The strength limit is often expressed as ob.
(2) Good surface quality
For materials with good surface quality, the workpiece is less likely to break during stamping and waste products are reduced; the mold is less likely to be scratched, the service life is improved, and the surface quality of the workpiece is good. Therefore, it is generally required that the surface of stamping materials is smooth and smooth, without defects such as oxide scale, cracks, rust spots, scratches, etc.
(3) Meet the thickness tolerance specified in national standards
The mold gap is determined according to the material thickness, so the material thickness tolerance should comply with national standards. Otherwise, the thickness tolerance is too large, which will affect the quality of the workpiece and may cause damage to the mold and equipment.
Performance requirements of stamping materials:
Stamping materials are an important factor affecting part quality and mold life. At present, the materials that can be stamped are not only low carbon steel, but also stainless steel, aluminum and aluminum alloys, copper and copper alloys, etc. Generally, materials with carbon content <0.25% and tensile strength less than 650N/mm² are the main materials. For example, cold rolled steel SPCC (JIS) or 1010 (SAE).
Stamping performance requirements for metal materials:
(1) It has good mechanical properties and large deformation ability. The mechanical properties of metal materials refer to tensile strength, yield strength, elongation, hardness, and plastic strain ratio.
(2) It has an ideal metallographic structure, which is the microscopic quality characteristic of the material. Its main sign is: the degree of spheroidization of cementite or carbide.