Induction heating heat-treating method of car VGR (variable rack ratio) rack bar

A heat treatment method and induction heating technology, applied in heat treatment furnaces, heat treatment equipment, process efficiency improvement, etc., can solve secondary defects and other problems, achieve excellent product quality, and eliminate appearance indentation or scratches

Inactive Publication Date: 2014-08-13
朴锺奎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The tempering process of the aforementioned heating furnace method needs to move the product to the heating furnace for tempering, so secondary defects such as indentation and scratches on the appearance of the product are prone to occur

Method used

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  • Induction heating heat-treating method of car VGR (variable rack ratio) rack bar
  • Induction heating heat-treating method of car VGR (variable rack ratio) rack bar
  • Induction heating heat-treating method of car VGR (variable rack ratio) rack bar

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Experimental program
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Effect test

Embodiment

[0055] Purchasing 150kW×9kHz high-frequency induction heating equipment, according to Figure 4 After the VGR gear rod is fixed in the way shown, the high-frequency induction heating equipment is used for high-frequency heat treatment. First, the high-frequency heat treatment step sets the output to 6.3 and the descending speed to 7.0 at the upper end, the output to 6.0 and the descending speed to 9.0 at the middle, and the output to 6.3 at the lower end And set the descending speed to 7.0, and then carry out high-frequency induction heating heat treatment. At this time, the VGR gear bar is lowered in a non-rotating state, and is simultaneously water-cooled by a water-cooling supply device while performing high-frequency induction heating heat treatment.

[0056] After the high-frequency induction heating heat treatment is completed, in the same high-frequency induction heating device, the VGR gear bar is lowered in a non-rotating state and high-frequency tempering is perform...

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Abstract

The invention relates to an induction heating heat-treating method of a car VGR (Variable Rack Ratio) rack bar. The method is capable of easily and conveniently performing tempering for improving durability while satisfying the mechanical properties required by the car VGR rack bar. The method comprises: a) a high-frequency treating step, in which a high-frequency induction heating device with a frequency of less than 10kHz is used for induction heating heat-treating, the VGR rack bar is disposed in an internal through hole of an induction coil and is moved up and down during the induction heating heat-treating, and a water sprayer connected to a water cooling device is disposed at the lower part of the induction coil and carries out water cooling simultaneously; and b) a high-frequency tempering step, which is performed by using the same high-frequency heating device after the high-frequency treating step, and which is performed with the VGR rack bar moving up and down under the condictions that the water cooling is not carried out and the output of the high-frequency heating device is lower than that of the high-frequency heating device in the high-frequency treating step.

Description

technical field [0001] The invention relates to an induction heating heat treatment method for a variable rack ratio (VGR, Variable rack ratio) rack bar (RACK BAR) for a vehicle. The VGR gear bar induction heating heat treatment method for vehicles can easily perform tempering work to improve durability while maintaining excellent mechanical properties. Background technique [0002] The gear rod for vehicles is a part that can convert and transmit the rotary motion of the piston driven by the steering wheel of the vehicle into the linear motion of the rack (RACK). The steering feel of the steering wheel can be improved by changing the gear ratio according to the steering angle. [0003] The variable rack ratio gear rod is a device that changes the reaction force of the steering wheel (Steering Wheel) when driving at low or high speeds or parking. direction. [0004] figure 1 It is a photo of the VGR rack. Such as figure 1 As shown, the VGR gear bar is composed of a cyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/42
CPCY02P10/25C21D1/42C21D9/00
Inventor 朴锺奎
Owner 朴锺奎
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