A large diameter and large pitch screw surface induction heating device and surface heating method

Abstract

The invention provides a large diameter and large pitch screw surface induction heating device and a surface heating method. The device includes a base transmission device, a mobile sliding table device, a telescopic induction coil device, a thermometer, a CCD camera and a helical coil. The movement of the screw in two directions and matching the corresponding speed, let the diamond coil move along the tooth profile of the screw to be heated, scan the surface of the tooth profile of the screw to be heated, and then pass the helical coil with high-frequency current to heat the surface of the screw to be heated. The tooth top surface of the screw is heated so as to cover the entire surface of the screw to be heated. At the same time, the temperature is measured in real time during the heating process through the thermometer, and compared with the target temperature in real time, and the heating parameters and motor speed are adjusted in real time. Control the heating temperature difference so that the entire surface of the screw to be heated is completely and uniformly heated, forming a temperature gradient of the entire tooth profile, improving the heating quality, and laying a good foundation for the next step of quenching.

Description

technical field [0001] The invention relates to the technical field of screw production, in particular, to a surface induction heating device and a surface heating method for a large-diameter and large-pitch screw. Background technique [0002] The screw is a functional component that converts rotary motion and linear motion. It has the characteristics of smooth transmission, precise positioning and high transmission efficiency. It is widely used in various industrial equipment, precision instruments and precision CNC machine tools. Since the lead screw is often subjected to composite loads such as bending, torsion, impact, etc., it is required to have good comprehensive mechanical properties and high dimensional stability, and the relevant working parts have high hardness, high strength and sufficient wear resistance. . At present, induction quenching heat treatment is generally used to meet the requirements of the internal performance of the screw, but the coarse martensi...

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Problems solved by technology

[0003] According to the existing single-frequency induction hardening proposed above, it is difficult to meet the uniform heating of the surface of the screw rod, especially for the screw rod with large diameter and large pitch, it is easy to cause a large temperature difference in the direction of the tooth profile, resulting in the hardness of the quenched layer on the tooth profile of the screw rod Uneven distribution and excessive deformation of the workpiece can not obtain a uniform hardened layer imitating the tooth profile, resulting in the technical problem of surface cracks in the workpiece during subsequent processing. A surface induction heating device and surface heating method for a large-diameter and large-pitch screw rod is provided.

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