CN103820612A - Method for controlling deformation during heat treatment of shock absorber bearings - Google Patents

Abstract

A method for controlling deformation during heat treatment of shock absorber bearings comprises the following steps: placing workpieces on a plane surface in order; annealing, wherein the annealing temperature is 500 to 600 DEG C, and the temperature is kept for 3 to 4 hours; quenching; carrying out mould pressing and tempering: a plurality of workpieces are superimposed for tempering according to three stages (1) preheating stage: the workpieces are well mounted but not clamped, and are placed into a tempering furnace to be heated to 180 DEG C; (2) clamped correction stage: after the workpieces in the tempering furnace are heated to be 180 DEG C, the temperature is kept for 30 minutes, the workpieces are taken out with special tools, screw caps at two ends of each workpiece are tightened, and the workpieces are placed into the tempering furnace again to be heated to 200 DEG C; (3) cooling stage: after rising to 200 DEG C, the temperature is kept for 40 minutes, the workpieces are taken out for air cooling, and the screw caps are unscrewed after the workpieces are cooled completely. The method can not only control the deformation to be within 0.1 mm to greatly reduce the product rejection rate, but also improve the heat treatment quality and reduce processing and manufacturing cost. Through continuous batch production, the detected qualification rate of the shock absorber bearings after heat treatment can be 100 percent.

Description

A kind of automobile absorber bearing method for controlling heat treatment deformation

Technical field

The invention belongs to bearing heat treatment technics field, relate generally to a kind of vibroshock bearing method for controlling heat treatment deformation

Background technology

The company of domestic production vibroshock bearing is little at present, and quality product also exists very large gap with external similar comparing, and most of clients use the imported bearing such as INA and SKF.Due to automobile absorber bearing arrangement more complicated, bearing parts mostly is soft steel or high carbon steel cold stamping is shaped, and the part after shaping no longer carries out machining, therefore, steel ball raceway groove face requirement to ram axle circle, seat ring is high especially, requires bearing thermal treatment rear surface non-oxidation, is out of shape little.In actual production, piece surface non-oxidation can be controlled preferably, but distortion is difficult to control, qualification rate after quenching is all lower at every turn analyzes as an example of BDA1029 bearing example, its dimensional structure as shown in Figure 1, the steel plate thickness of punching press blowout patche and seat ring is 1.0mm, material is 65Mn, require raceway groove and riveting place deflection to be no more than 0.2mm, processing requirement blowout patche and seat ring raceway groove and riveting place plane warping deflection are no more than 0.2mm, but 65Mn belongs to high carbon alloy structure iron, when stamping, can produce very large stress, thermal treatment after strain amount is larger, under existing working condition, scrap rate is high, qualification rate only reaches 50% left and right, cause tooling cost very high.

Summary of the invention

The object of the invention is to propose a kind of vibroshock bearing method for controlling heat treatment deformation, not only Reducing distortion amount, has significantly reduced the scrap rate of product, and has improved thermal treatment quality, has reduced processing and manufacturing cost.

As follows for completing its step of foregoing invention object the technical solution used in the present invention:

A, plane are put neatly;

B, annealing: 500～600 ℃ of annealing temperatures, are incubated 3～4 hours;

C, quenching;

D, press tempering: multiple workpiece stacks are carried out to tempering, and (1) pre-heating stage, installs rear elder generation by workpiece and do not clamp, and puts into tempering stove and is warming up to 180 ℃; (2) clamp calibration phase, the workpiece in stove is warmed up to after 180 ℃, and then insulation 30min takes out with special tool, and two ends nut is tightened, and again puts into stove, is warming up to 200 ℃; (3) cooling stages, rises to 200 ℃ by temperature, after insulation 40min, takes out air cooling, thoroughly cooling rear loosen nut.

A kind of vibroshock bearing method for controlling heat treatment deformation that the present invention proposes, automobile absorber bearing race blowout patche part is through above-mentioned improved thermal treatment process, and deflection can be controlled in 0.1mm, has significantly reduced scrap rate and the processing and manufacturing cost of product.Produce through continuous batch, after the thermal treatment of vibroshock bearing part, detect qualification rate and reached 100%.

Accompanying drawing explanation

Fig. 1 is BDA1029 bearing size structural representation.

embodiment

Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.

Embodiment 1:

Take BDA1029 bearing as example, shown in bearing arrangement schematic diagram, the steel plate thickness of punching press blowout patche and seat ring is 1.0mm as shown in Figure 1, and material is 65Mn, requires blowout patche and seat ring raceway groove and riveting place plane warping deflection to be no more than 0.2mm.50 of each tested parts quantity.

The method of the present embodiment heat treatment deformation is: first workpiece planarization is put neatly; Then carry out stress relief annealing operation; 500～600 ℃ of annealing temperatures, are incubated 3～4 hours, the stress producing while eliminating cold-extrusion shaping; After quenching, multiple workpiece stacks are carried out to press tempering, concrete grammar is: (1) pre-heating stage, and workpiece is installed to rear elder generation and do not clamp, put into tempering stove and be warming up to 180 ℃; (2) clamp calibration phase, the workpiece in stove is warmed up to after 180 ℃, and then insulation 30min takes out with special tool, and two ends nut is tightened, and again puts into stove, is warming up to 200 ℃; (3) cooling stages, rises to 200 ℃ by temperature, after insulation 40min, takes out air cooling, thoroughly cooling rear loosen nut.

Claims (1)

1. a vibroshock bearing method for controlling heat treatment deformation, is characterized in that the inventive method step is as follows:

A, plane are put neatly;

B, annealing: 500～600 ℃ of annealing temperatures, are incubated 3～4 hours;

C, quenching;

D, press tempering: multiple workpiece stacks are carried out to tempering, and (1) pre-heating stage, installs rear elder generation by workpiece and do not clamp, and puts into tempering stove and is warming up to 180 ℃; (2) clamp calibration phase, the workpiece in stove is warmed up to after 180 ℃, and then insulation 30min takes out with special tool, and two ends nut is tightened, and again puts into stove, is warming up to 200 ℃; (3) cooling stages, rises to 200 ℃ by temperature, after insulation 40min, takes out air cooling, thoroughly cooling rear loosen nut.

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