Gear machining and heat treatment process

Abstract

The present invention discloses a gear machining and heat treatment process, and the gear machining process successively comprises forging, normalizing, quenching and tempering, vertical machining, gear shaping, annealing, vertical machining, gear shaping, vertical milling, stabilizing aging, gear grinding, nitriding and finished product inspection, wherein the step of normalizing is normalizing at (880 +/-10) DEG C for (3-4) h, and then cooling in air; the step of quenching and tempering is quenching and tempering at (850 +/-10) DEG C for (3-4) h, quenching with water, and cooling with oil; the step of the annealing is annealing at (530 +/-10) DEG C for (3-4) h, cooling in a furnace in the heating and cooling rate of less than or equal to 50 DEG C / h; the step of stabilizing aging is stabilizing aging at (510 +/-10) DEG C for (3-4) h, and cooling in the furnace in the heating and cooling rate of less than or equal to 2 5 DEG C / h; and the step of nitriding is nitriding at (510 +/-10) DEG C for (10-12) h, and cooling in the furnace in the heating and cooling rate of less than or equal to 2 5 DEG C / h. The gear machining and heat treatment process is more reasonable, and can reduce distortion after nitriding to improve the overall performance of a gear.

Description

technical field [0001] The invention belongs to the field of metal heat treatment technology, in particular to a gear processing and heat treatment technology. Background technique [0002] Gear processing process: forging→normalizing→quenching and tempering→vertical lathe→gear shaping→annealing→vertical lathe→gear shaping→vertical mill→stabilizing aging→grinding→nitriding→finished product inspection. The nitriding process is carried out after the finished gear is ground. Nitriding is the last process of the gear. To ensure the high-precision level of the gear, it is necessary to strictly control the nitriding deformation. In actual production, the distortion after nitriding has always been a problem that plagues heat treatment production at home and abroad. Once the deformation cannot be effectively controlled, the precision level of the gear will be reduced, and the entire gear transmission system will generate shock vibration and noise during operation, which will reduce...

AI Technical Summary

Problems solved by technology

In actual production, the distortion after nitriding has always been a problem that plagues heat treatment production at home and abroad.

Once the deformation cannot be effectively controlled, the accuracy level of the gear will be reduced, and the entire gear transmission system will generate shock vibration and noise during operation, which will reduce the reliability of operation and affect the life of the whole machine