Some switchgear contact parts are made of tin bronze material, which requires good elasticity, wear resistance, diamagnetism and corrosion resistance. Due to the complex shape of the part, in the process of stamping and bending, in order to make the processed part have sufficient toughness while maintaining a certain strength and elasticity, and to avoid cracking at the corner when the workpiece is bent, this type of The material workpiece is subjected to the necessary annealing treatment. For this reason, how to formulate suitable processing procedures and heat treatment processes in order to meet the design requirements and production requirements of parts is very necessary.
1. Contact parts materials and heat treatment requirements
(1) Material 2.5mm thick tin bronze sheet.
(2) Heat treatment requirements After annealing, the workpiece has sufficient toughness while maintaining certain strength and elasticity, so that there should be no cracks or processing difficulties due to work hardening during stamping and bending.
2. Contacts are prone to problems in the process of stamping and bending
When the tin bronze sheet is processed directly without corresponding heat treatment, a certain degree of work hardening occurs due to the contact material after punching (including punching, cutting grooves, etc.) into the corresponding board conditions, resulting in subsequent bending During the processing, the disadvantages of breaking the punch and aggravating the wear of the die are prone to occur; at the same time, due to insufficient toughness, the workpiece is easy to crack, difficult to form, and affect the ultimate forming size of the part during the bending process. For this reason, it is necessary to formulate suitable processing lines and heat treatment processes in order to meet the design requirements and production requirements of the parts.
3. Schedule of parts processing route
According to the shape of the part, the characteristics of the processing equipment and the method of use, and the change in the material properties of the part during the processing, the processing route can be roughly scheduled as: knife and scissors → stamping → annealing → bending → annealing → bending forming → surface Processing and other processing procedures.
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