Method for eliminating internal stress of crankshaft through harmonic spectrum vibration aging treatment

A technology of harmonic vibration and aging treatment, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of engine crankshaft manufacturing and use that have not been reported.

Inactive Publication Date: 2011-04-13
桂林福达曲轴有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has been successfully applied in the field of aerospace military industry and large-scale equipment manufacturing, but it has not been reported in the manufacture of engine crankshafts.

Method used

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  • Method for eliminating internal stress of crankshaft through harmonic spectrum vibration aging treatment
  • Method for eliminating internal stress of crankshaft through harmonic spectrum vibration aging treatment
  • Method for eliminating internal stress of crankshaft through harmonic spectrum vibration aging treatment

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Experimental program
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Embodiment Construction

[0017] 1. Spectrum harmonic aging equipment ： One set of navigator spectrum harmonic aging expert system; one set of LH6505 exciter; one set of bow clamp.

[0018] 2. Process flow: blank - rough machining (drilling center hole, turning spindle and connecting rod journal, leaving a margin of 0.40mm on one side) - spectrum harmonic aging - finishing (turn drilling, grinding) - Nitriding - Polishing.

[0019] 3. This kind of workpiece adopts platform auxiliary clamping, and 4 rubber pads are used to support the platform stably. 34 crankshafts are clamped each time, and the vibration exciter is rigidly clamped on the platform with a bow clamp for processing.

[0020] 4. On-site support and clamping. See figure 1 , figure 2 . A total of 34 crankshafts 7 are clamped on a square platform 5. Each crankshaft is fixed on the platform by four sets of fixing parts consisting of a screw 1, a nut 2, a V-shaped block 3 and a pressure plate 4. The rubber shock absorber 6 is located unde...

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PUM

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Abstract

The invention provides a method for eliminating internal stress of a crankshaft through harmonic spectrum vibration aging treatment during engine crankshaft manufacturing. The method achieves the optimal stress elimination effect and meets the requirement for run-out distortion after nitriding treatment of the crankshaft through optimal design of the clamping modes, adjustment and selection of the harmonic frequencies in tests, reasonable placement of the vibration source (vibration exciter), effective control of noise pollution and reasonable selection of the clamp supporting modes. The method eliminates the internal stress of the crankshaft through harmonic spectrum aging treatment instead of thermal aging, improves the production efficiency, lowers the aging cost and realizes energy conservation and emission reduction. Through detection and statistics of the run-out after nitriding of the crankshaft subjected to vibration aging treatment, the percent of pass of the run-out distortion of the crankshaft absolutely meets the design requirement and meets the technical requirement of nitriding treatment of the crankshaft.

Description

technical field [0001] The invention relates to the manufacture of auto parts, in particular to the elimination of thermal stress of the auto parts, and more specifically to the method for eliminating the internal stress of the crankshaft through frequency spectrum harmonic vibration aging treatment. Background technique [0002] The crankshaft adopts ion nitriding strengthening process. After the rough machining of the crankshaft, stress relief tempering (thermal aging) treatment is required to eliminate internal stress and ensure the crankshaft beating deformation requirements after ion nitriding. Due to the use of electric furnace heating, there are disadvantages such as high energy consumption, low efficiency, and oxidation of workpieces. [0003] The vibration aging process is a process method that uses the principle of resonance to homogenize and eliminate the internal residual stress of the crankshaft, and is a new technology that can replace the traditional thermal a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/30C21D10/00
Inventor 张劲柯
Owner 桂林福达曲轴有限公司
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