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Method of eliminating bending deflection of tufftriding forged steel crank shaft

A bending deformation and nitrocarburizing technology, applied in the field of nitrocarburizing forged steel crankshafts to eliminate bending deformation, can solve the problems of workpiece deformation, large axis bending deformation, scrapped crankshaft cracks, etc., to improve the qualification rate, reduce the amount of correction, avoid The effect of scrapped crankshaft

Inactive Publication Date: 2013-06-05
HARBIN DONGAN AUTO ENGINE
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, soft nitriding will lead to deformation of the workpiece, especially the bending deformation of the axis is large, and the pass rate (spindle runout ≤ 0.05) is even lower than 10%, while the crankshaft with a spindle runout greater than 0.15 will easily lead to crankshaft cracks and scrap when corrected

Method used

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  • Method of eliminating bending deflection of tufftriding forged steel crank shaft

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Embodiment Construction

[0008] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0009] The crankshaft of the present invention is processed-pre-correction-cleaning-nitrocarburizing-runout inspection correction-magnetic flaw detection-cleaning.

[0010] The pre-calibration is to use a pressure straightening machine to correct the bending deformation of the intermediate journal of the crankshaft and control it within the range of ±0.01 of the vector center value, and the direction of the correction control is the opposite direction of the vector center value.

[0011] First take a batch of workpieces, at least 10 pieces for pre-test, process according to the crankshaft - cleaning - nitrocarburizing - runout inspection and correction - magnetic flaw detection - cleaning, the runout of the intermediate journal required to be machined before nitrocarburizing is ≤ 0.03. In the runout inspection and correction process, the distr...

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Abstract

The invention relates to a method of eliminating bending deflection of a tufftriding forged steel crank shaft, and the crank shaft is subjected to processing, precorrection, cleaning, tufftriding, inspection and correction of bouncing, magnetic crack detection and cleaning. The technique can effectively control the bending deflection of the tufftriding forged steel crank shaft, and directly improves finished product yield of the crank shaft after the tufftriding processing. Due to the fact that when subjected to the precorrection, the crank shaft is relatively good in toughness, a correcting value can be effectively reduced by the precorrection after the tufftriding, and the phenomenon that the crank shaft is scraped due to the occurrence of cracks is avoided. The method can also be popularized for control of the bending deflection of axial lines of other shaft parts after the tufftriding.

Description

technical field [0001] The invention relates to a method for eliminating bending deformation of a nitrocarburized forged steel crankshaft. Background technique [0002] At present, the crankshaft is one of the most expensive parts of the engine, and it is subjected to combined bending-torsion fatigue load, torsional vibration and wear during service. Strengthening the surface of the crankshaft by means of heat treatment is extremely important for improving the life of the crankshaft. The crankshaft of the engine is subjected to soft nitriding treatment, and the processing route of processing the crankshaft-cleaning-soft nitriding-runout inspection and correction-magnetic flaw detection-cleaning can be considered as a relatively complete strengthening method. However, nitrocarburization will lead to deformation of the workpiece, especially large axial bending deformation, and the pass rate (spindle runout ≤ 0.05) is even lower than 10%, while crankshafts with a spindle runou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D3/00
Inventor 毕合春刘宝昌曹宝军于小飞张佰军刘奎丰王宝林朱进军张俊宇
Owner HARBIN DONGAN AUTO ENGINE
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