Car crash box residual stress elimination method

A residual stress and collision energy absorption technology, applied in the field of automobile collision, can solve problems such as inability to homogenize, inability to surface strengthening by vibration aging method, inability to homogenize residual stress, etc., to achieve the effect of improving energy absorption effect and strong versatility

Inactive Publication Date: 2018-09-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above methods have certain limitations. The thermal aging method cannot homogenize the overall residual stress, the vibration aging method cannot strengthen the surface, and the ultrasonic impact method cannot eliminate the overall residual stress.
It can be seen that a single residual stress relief method cannot strengthen the surface of the energy-absorbing box while eliminating and homogenizing the overall residual stress

Method used

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  • Car crash box residual stress elimination method

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Experimental program
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Effect test

Embodiment 1

[0021] The present invention takes the automobile crash absorbing box as the processing object. Relief of residual stress for ordinary square stainless steel energy-absorbing boxes.

[0022] Step 1: Vibration aging treatment.

[0023] (1) Select a vibration source with an exciting force of 2 tons according to the weight of the energy-absorbing box.

[0024] (2) Support the workpiece with elastic objects such as rubber pads, install the vibrator on one end of the workpiece, and fix the sensor for testing on the workpiece.

[0025] (3) Connect the exciter, sensor, and controller with cables.

[0026] (4) Select the vibration time to be 35 minutes, and then carry out vibration aging treatment.

[0027] Step 2: Thermal aging treatment. That is, put the energy-absorbing box into the thermal aging furnace, slowly heat it up to 500°C at a rate of 80°C / h, keep it warm for 4.5 hours, and then slowly cool it down to 180°C with the furnace and leave the furnace for air cooling.

[0...

Embodiment 2

[0030] Stress relief treatment is carried out on the ordinary square aluminum alloy energy-absorbing box.

[0031] Step 1: Vibration aging treatment.

[0032] (1) Select a vibration source with an exciting force of 2 tons according to the weight of the energy-absorbing box.

[0033] (2) Support the workpiece with elastic objects such as rubber pads, install the exciter at both ends of the workpiece, and fix the sensor for testing on the workpiece.

[0034] (3) Connect the exciter, sensor and controller with cables.

[0035] (4) Select the vibration time to be 35 minutes, and then carry out vibration aging treatment.

[0036] Step 2: Thermal aging treatment. That is, put the energy-absorbing box into the thermal aging furnace, slowly heat it to 300°C with the furnace and keep it for 5 hours, and then slowly cool it to 180°C with the furnace and leave the furnace for air cooling.

[0037] Step 3: Ultrasonic shock treatment. The impact tool head must use a flat impact head. ...

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Abstract

The invention belongs to the field of car crash and belongs to a car crash box residual stress elimination method. The method comprises the steps of conducting vibration ageing treatment, conducting heat ageing treatment on a crash box and conducting ultrasonic impact treatment on the surface of the crash box. Through combination of vibration ageing, heat ageing and ultrasonic impact and engineering practice and testing, the residual stress elimination rate of the crash box can reach 90% or above. The surface of the crash box is reinforced, and the energy absorption effect is substantially improved. Meanwhile, the method is applicable to residual stress elimination of other metal thin-walled structure and has high universality.

Description

technical field [0001] The invention belongs to the field of automobile collision, and relates to a method for eliminating residual stress of a metal device, in particular to a method for eliminating residual stress of an energy-absorbing box for automobile collision. Background technique [0002] The car crash absorber is the main energy-absorbing component at the front end of the longitudinal beam of the car. The energy absorbing capacity of the crash box directly determines the crashworthiness and passive safety of the vehicle. The energy-absorbing box is generally a metal thin-walled shell structure, and its energy-absorbing effect is improved by prefabricating a specific shape. This kind of metal thin-walled structure will inevitably produce residual stress in the process of casting, cutting, straightening and other processing, which directly causes problems such as poor structural stability, easy crack initiation, reduced fatigue strength, and accelerated stress corros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/04C21D10/00
CPCC21D1/04C21D10/00Y02P10/20
Inventor 王伟周震寰赵祯廉增博陈营利祝圣博杨震霆徐新生
Owner DALIAN UNIV OF TECH
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