Induction quenching method of shifting guide shaft of automatic transmission

Abstract

The invention relates to an induction quenching method of a shifting guide shaft of an automatic transmission, which is characterized by utilizing a dual-ring series inductor continuous quenching mode; putting one end of a part downwards between two centres and clamping, wherein the end of the part is provided with a rectangular ring slot the width of which is 12mm; pressing a start button to start to rotate the part; moving the inductor to the quenching initial position at the lower end of a shaft neck the diameter of which is 18mm, starting to heat with a set power of 35kw and delaying; spraying water after delaying, stopping water spay and rotating after repeated work of the inductor, and taking off the part from the position between the two centres to finish the whole quenching process. The method effectively control the distribution of a hardening layer, avoiding the phenomena of overburing and melting at local closed angles and thin walls, thus realizing the continuous distribution of the induction quenching effective hardening layer at two sides and the bottom of the groove and realizing the quenching at the two sides and the bottom of the groove.

Description

Technical field: [0001] The invention relates to an induction hardening method for a shift guide shaft of an automatic gearbox. Background technique: [0002] In order to improve the wear resistance of the shift guide shaft in the AMT transmission independently developed by FAW, induction hardening is required for part of the journal and both sides and the bottom of a 12mm wide rectangular ring groove. Due to the large change in structure size and the characteristics of induction heating, it is very difficult to realize this process. The technical difficulties are as follows: ①Because the rectangular notch of the part has a depth of 3mm, the traditional continuous quenching process can only be quenched at the two sharp corners of the notch. If the control is not proper, local overburning or Melting phenomenon, but quenching and strengthening cannot be obtained at the bottom of the tank. ②At one end of the notch there is an oil passage hole with a wall thickness of only 2mm...

AI Technical Summary

Problems solved by technology

The technical difficulties are as follows: ①Because the rectangular notch of the part has a depth of 3mm, the traditional continuous quenching process can only be quenched at the two sharp corners of the notch. If the control is not proper, local overburning or Melting phenomenon, but cannot be quenched and strengthened at the bottom of the tank

②At one end of the notch there is an oil channel hole with a wall thickness of only 2mm and a diameter of Φ4mm. It is difficult to avoid the melting of the hole wall during the quenching process.

The induction hardening quality of this part cannot meet the technical conditions stipulated in the drawings, nor can it meet the performance requirements

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