CN1330779C - Heat treating trimming method for large-scale bearing ring - Google Patents

Abstract

The present invention relates to a heat treating trimming method for a large-scale bearing ring, which has the technical processes that a: in a hardening furnace, a ring is heated to 810-860 DEG C; after the heat of the ring is preserved for 50 to 120 minutes, the ring is taken out of the furnace to be cooled in coil to temperature of 120-150 DEG C; b: elliptical deformation quantity is detected by measurement appliances of a pipe ruler, etc. a ring of which the deformation quantity surpasses the standard of Q/WZ. J3731-2002 is trimmed in a qualified range in a method of internal stay trimming; after the ring is cooled to room temperature, a trimming tool is removed; e: the trimmed ring is put into a tempering furnace and is heated to 150-180 DEG C; heat is preserved for 3.5 to 4 hours to eliminate quenching and trimming stress; f: qualified products are delivered to the next process step. The present invention has the advantages that compared with the prior art, the present invention reduces a tempering, and thus, the present invention can reduce the cost and enhance the utilization rate of equipment.

Description

Heat treating trimming method for large-scale bearing ring

Technical field

The invention belongs to bearing heat treatment technics field, particularly a kind of heat treating trimming method for large-scale bearing ring.

Background technology

Existing large-scale bearing ring thermal treatment process flow process is quenching, and------band top tempering--is unloaded the top--tempering---pay, is had problems such as cost of idleness, increase life cycle of the product, reduction plant factor in shaping in measurement.Bearing industry recovery at present, output increases, and existing technology can't satisfy the growth needs, must improve.

Summary of the invention

Purpose of the present invention just provides a kind of heat treating trimming method for large-scale bearing ring, and this method has been omitted band top tempered processing step, can reduce production costs, and improves usage ratio of equipment, shortens the production cycle.

Technical solution of the present invention is, a kind of heat treating trimming method for large-scale bearing ring, and the technical process of this method is: quench--measure--shaping--unload the top--tempering---pay, its concrete steps are:

A, in RJX-75 or RJJ-180 quenching furnance, lasso is heated to 810-860 ℃, be incubated the oil cooling of coming out of the stove after 50-120 minute, be cooled to 120-150 ℃;

B, usefulness pipe chi etc. are measured apparatus and are detected the ovalizing deflection amount;

C, to the be above standard lasso of Q/WZ.J3731-2002 of the back ovalizing deflection amount of quenching, with shaping tool with its ovalizing deflection amount with the shaping of inner support shaping method to acceptability limit, former technology increases anti-deformation 70%, and existing technology increases anti-deformation 150%;

D, be cooled to room temperature, remove shaping tool;

E, the lasso after the shaping is put into tempering stove, be heated to 150-180 ℃, be incubated 3.5-4 hour, eliminate and quench and shaping stress;

F, salable product are moved on to next procedure.

Quenching temperature is 825 ℃, and when tempering was 175 ℃ of temperature, shaping effect was better.

The invention has the beneficial effects as follows: reduced by a tempering, can reduce cost, improved usage ratio of equipment, shortened the production cycle, helped organization of production, made shaping easier.

Embodiment

Quenching furnance uses the RJX-75 stove, in 3 inner ring embedded stoves of 23080CA, quenching temperature is 825 ℃, is incubated the oil cooling of coming out of the stove after 84 minutes, when being cooled to 140 ℃, detect distortion 0.80mm, utilize the quenching waste heat, increase anti-deformation 1.2mm with holder, be chilled to room temperature, remove shaping tool, again inner ring is put into the tempering of RJT-85 tempering stove, technology is that temperature is 175 ℃, be incubated and come out of the stove after 4 hours, the measurement ovalizing deflection is 0.20mm, reaches standard-required.The standard-required distortion is no more than 0.40mm.By after the former technology shaping, oval average out to 0.35mm, rework rate are 30%; After existing technology shaping, oval average out to 0.20mm, rework rate are 5%.

Claims (2)

1, a kind of heat treating trimming method for large-scale bearing ring, it is characterized in that, the technical process of this method is: quench, and----shaping--is unloaded the top--tempering---pay in measurement, its concrete steps are: a, in quenching furnance, lasso is heated to 810-860 ℃, be incubated 50-120 minute, the oil cooling of coming out of the stove is cooled to 120-150 ℃;

B, use are measured apparatus and are detected the ovalizing deflection amount;

C, to the be above standard lasso of Q/WZ.J 3731-2002 of the back ovalizing deflection amount of quenching, with shaping tool with its ovalizing deflection amount with the shaping of inner support shaping method to acceptability limit;

D, be chilled to room temperature, remove shaping tool;

E, the lasso after the shaping is put into tempering stove, be heated to 150-180 ℃, be incubated 3.5-4 hour, eliminate and quench and shaping stress;

F, salable product are moved on to next procedure.

2, a kind of heat treating trimming method for large-scale bearing ring according to claim 1 is characterized in that, described quenching temperature is 825 ℃, and tempering temperature is 175 ℃.