Ohmic heating device for toothed bar

Abstract

The invention relates to an ohmic heating device for a toothed bar. The ohmic heating device comprises a pair of energizing electrodes, a compressing means, a cooling means, a power supply means and a control means, wherein the pair of energizing electrodes are arranged at an interval, can contact with the tooth surface of the toothed bar from downward and are located at two end positions of an axis direction, the compressing means abuts against the tooth surface from upward and conducts downward compressing action with a certain pressure, the cooling means is arranged between the pair of energizing electrodes and can jet cooling water onto the tooth surface, the power supply means comprises a quenching power supply part and an annealing power supply part which respectively supply the pair of energizing electrodes with high frequency power currents used for quenching and annealing, and the control means controls the pair of energizing electrodes, the compressing means, the cooling means and the power supply means. The control means controls the quenching power supply part of the power supply means to supply the pair of energizing electrodes with a certain high frequency current for quenching of the tooth surface; and after quenching, in the state that the toothed bar maintains unchanged, a certain high frequency current is supplied to the pair of energizing electrodes from the annealing power supply part of the power supply means so as to realize annealing of the tooth surface. With the ohmic heating device, one-shot installation of the toothed bar and continuous quenching and annealing can be realized; and equipment is simplified and cost is reduced while simple and high-precision quality management is carried out.

Description

technical field [0001] The present invention relates to an electric heating device for a rack used for quenching and annealing the tooth surface of a rack (including a rack) used for vehicles, for example, by electric heating. Background technique [0002] Originally, such an electric heating device includes a pair of electric heating electrodes disposed opposite to each other along the longitudinal direction of the rack within its heating range, a power supply device for supplying a constant high-frequency current to the electric electrodes, and the like. Moreover, when heat-treating the tooth surface of the rack, the rack is first installed on an energized heating device for quenching, and a high-frequency power supply for quenching frequency is supplied from the high-frequency power supply of the device to the energized electrode for a certain period of time, and then After cooling, a certain range of the tooth surface is quenched. [0003] Then, this quenched rack is re...

AI Technical Summary

Problems solved by technology

Therefore, the heat treatment process is two processes performed by different equipment, and sometimes the annealing operation may be forgotten, and it is difficult to perform simple and high-precision quality control

In addition, each energized heating device requires a high-frequency power supply and energized electrodes, and equipment investment costs are high. As a result, the cost of heat treatment is high, and it is likely to cause adverse effects in terms of cost.

Images