Process analysis of heat treatment of woodworking machine tool blades using medium frequency induction heating power supply

The blade is mainly used for cutting, therefore, it is necessary to withstand huge friction during the work process. In order to meet the working requirements of the blade, many manufacturers use medium frequency induction heating power to heat treat it, and the effect is very good. Today, the editor will take woodworking machine tool blades as an example to briefly introduce to you the medium-frequency induction heat treatment process.

Woodworking machine tool blades are punched and formed from 15mm thick 60Si2Mn steel plates. The planed edge is heat treated, and finally the plane and edge are finely ground. The hardness after heat treatment is required to be 47-49HRC. The specific process is as follows:

Use a medium frequency induction heating power supply for induction heating at 870-890°C x 13 minutes, and quench into a two-nitrate quenching agent. The formula (mass fraction) is 30% NaNO3 + 20% NaNO2 + 50% water. The maximum cooling rate of the two-nitrate quenching medium in the range of 550-750°C is 800°C/s, which ensures that no high-temperature non-martensite structure will be generated in 60Si2Mn steel during quenching. The Ms point of 60Si2Mn steel is about 285°C. The cooling rate of the two-nitrate quenching medium is below 300°C, which is close to the cooling rate of the oil used in the L-AN32 total loss system. This reduces the structural stress and will not cause quenching deformation and cracking of the blade. After quenching using a medium frequency induction heating power supply, induction tempering heat treatment at 240-260°C x 30 minutes is performed, and air cooling is performed after tempering.

Many manufacturers perform heat treatment according to the above process, and the hardness of the workpieces produced fully meets the technical requirements, and the surface quality is improved, the cost is reduced, and the service life is extended. However, the editor here still wants to remind everyone that when performing the heat treatment process, we must be very serious and careful to avoid defects in the workpiece.