Heating treatment of I-shaped caliper by high frequency induction heating machine

The I-shaped caliper is a special measuring tool, which is mainly used to check the external dimensions of the workpiece or process and measure precision instrument parts. The I-shaped calipers that we often use in our lives are divided into two styles: adjustable size and fixed size. Since the caliper will be subjected to friction and collision forces during use, our requirements for the caliper are also very high, not only must it have high hardness, but also have good wear resistance and corrosion resistance. In the process of use and placement, the dimensional stability is better. According to the use characteristics of the I-shaped snap gauge, we will use thicker low-carbon steel or steel plate to make it during production. Then according to the process requirements, the I-shaped caliper is heat-treated by a high-frequency induction heating machine.

The production process of I-shaped snap gauge includes plate cutting, quenching and tempering, machine processing, heat treatment process, anti-rust treatment and other processes. Among them, quenching and tempering treatment needs to be heated at 900-950°C. After quenching, Then tempering treatment is carried out at 600-650°C, so that the calipers can obtain tempered sorbite structure. The heat treatment process of the high-frequency induction heating machine of the caliper includes normalizing, quenching, and tempering. Normalizing is to improve the overall hardness of the caliper and ensure a certain hardness, strength and toughness before quenching, which is the next step. ready for quenching. The quenching and tempering process requires two treatments, the first time is to heat at an environment of about 850 ° C, in order to further improve the toughness of the caliper and refine the internal structure. The second time it needs to be heated at a temperature of about 780 ° C. The purpose is to obtain a tempered structure, so that the hardness of the surface of the caliper meets the requirements, fully eliminate the grinding stress caused by grinding, and maintain uniform hardness and uniform size. stability. It should be noted that when heating, strict technical requirements must be followed to avoid affecting the pass rate of I-shaped snap gauges due to excessive heating time or high temperature.