Quenching and heat treatment process of diamond saw blade base 65Mn steel

Welding a diamond tip on a circular base becomes a diamond saw blade. Diamond saw blades are mainly used to process hard and brittle stone. To complete normal cutting, the matrix must have a certain strength and a certain stiffness. The comprehensive expression is that it must have sufficient hardness: Another important feature of the base is that strong vibration will occur during the rotation. Since the cutter head is thicker than the base, there is a certain gap between the base and the stone being cut during operation. In order not to In order for the matrix to break prematurely due to vibration, the matrix must have certain toughness, fatigue strength and tensile strength to mitigate impact and absorb vibration. Some domestic manufacturers have stipulated macroscopic standards for their technical parameters based on the use requirements and actual conditions of the substrate: the substrate hardness is 37 - 45HRC. The flatness is between ±15u.m, and the metallographic structure is tempered troostite. Now let’s talk about some opinions on the heat treatment of 65Mn steel matrix.

1) The base size of large diamond saw blades is 300-1600mm, and the thickness is generally only 2-4mm. It is inevitable for such a large and thin saw blade to deform and crack during heat treatment. To control deformation and cracking, the only way to control deformation and cracking is to adopt the pressure quenching process.

2) The pressure quenching device for pressure quenching of the substrate is simple and effective, which is beneficial to improving the quenching process level and quality of the substrate. Salt bath heating, pressurized oil quenching.

3) Design an economical and reasonable quenching fixture. The matrix after being released from the furnace should be easily and quickly loaded into the fixture for oil quenching, reducing the transfer time and ensuring the structure and hardness of the matrix after quenching.

4) Taking the specification of 350mm Otherwise the hardness will not meet the requirements.

5) Multiple substrates can be heated at the same time, taken out of the furnace together, loaded into the fixture, and quenched into the oil tank.

6) Pressure tempering at 450℃ x4 -5h, the clamp must have sufficient thickness and flatness.