Ultrasonic vibration-assisted screw induction hardening device and technique

Abstract

The invention discloses an ultrasonic vibration-assisted screw induction hardening device and a technique. The device comprises a rotating shaft, a first ultrasonic vibrator and two screw fixers, wherein the rotating shaft is used for driving a screw to rotate and is fixed on a machine tool; one end of the first ultrasonic vibrator is fixedly arranged on the end part of the first rotating shaft; one end of a first screw fixer is fixed together with the first ultrasonic vibrator while the other end of the first screw fixer is used for clamping one end of the screw; one end of a second screw fixer is fixed in a shell and is in contact with an elastic component in the shell; the second screw fixer can compress the elastic component; the continuous ultrasonic vibration assistance is performed in the heating and cooling processes of the screw, so that the screw heating is more uniform. Therefore, the soft point defect of the screw surface caused by the insufficient cooling can be prevented, more uniform hardness distribution can be acquired, the performance of the screw surface can be improved and the cooling water dosage can be saved.

Description

technical field [0001] The invention relates to a quenching device, in particular to an ultrasonic vibration-assisted induction quenching device and process for a lead screw. Background technique [0002] Ball screw is a key part used in many industrial equipment and CNC machine tools. However, the poor reliability and low precision of domestic ball screw have become a stumbling block in the development of precision and high-end equipment in my country. The ball screw works under alternating load and bears rolling friction, so the groove should have high contact fatigue strength, wear resistance and dimensional stability. In actual production, it is found that after the screw is ground, axial or mesh cracks often appear on the surface of the screw. The appearance of grinding cracks is not only related to the material itself and the grinding process, but also related to the heat treatment process. When the lead screw is used in production and use, the cracks may be due to e...

AI Technical Summary

Problems solved by technology

[0005] The existing workpiece, especially the quenching process of the lead screw, cannot obtain a relatively uniform martensitic structure due to the existence of grooves on the surface of the lead screw. Due to the inhomogeneity of the cooling water, the quenching of the lead screw is not uniform, resulting in the Bar hardness is not uniform

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