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Method and tool for straightening bending deformation of crankshaft

A bending deformation and crankshaft technology, which is applied in the field of crankshaft straightening method and straightening tooling, can solve the problems of easy cracking and difficult straightening of large crankshafts, and achieve the effect of simple straightening process

Active Publication Date: 2011-09-28
GUANGXI YUCHAI MASCH CO LTD
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  • Abstract
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Problems solved by technology

[0003] The method and device of the present invention are to overcome the defects in the above-mentioned prior art. The crankshaft is elastically corrected by a special straightening tool, which solves the problems of difficult straightening and easy cracking of large crankshafts in the prior art. The straightening process is simple and convenient. Safe and reliable

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  • Method and tool for straightening bending deformation of crankshaft
  • Method and tool for straightening bending deformation of crankshaft
  • Method and tool for straightening bending deformation of crankshaft

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Embodiment Construction

[0015] A specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0016] The straightening process of crankshaft bending deformation of the present invention mainly includes two steps of crankshaft straightening treatment and crankshaft heat setting treatment. The principle of slow and continuous plastic deformation. Since the creep effect of the metal is more obvious only when the temperature is higher than 0.3Tf (melting point temperature), we choose a temperature range of about 400°C for the nitrided crankshaft, and this temperature has no effect on the hardness of the nitrided layer. When straightening, use a special straightening platform (that is, the straightening base plate of the present invention). A screw rod for applying pressure is added to the middle position of the straigh...

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Abstract

The invention discloses a method for straightening bending deformation of a crankshaft. The method comprises the following steps of: performing elastic correction on the bent deformed crankshaft by using a straightening tool in a hot state, namely making the crankshaft generate certain reverse bending elastic deformation according to the bending deformation; performing setting treatment on the elastically corrected crankshaft at the temperature of 400+ / -10 DEG C; keeping the pressure state of the set crankshaft, and cooling the crankshaft to room temperature by air; and unloading the crankshaft, and performing stress removal aging treatment on the unloaded crankshaft at the temperature of 300+ / -10 DEG C. The invention also discloses a tool for straightening bending deformation of the crankshaft. The crankshaft is elastically corrected through the special straightening tool, the problems that the large crankshaft is difficult to straighten and easy to crack in the prior art are solved,and the straightening process is simple, convenient, safe and reliable.

Description

technical field [0001] The invention relates to a crankshaft straightening method and a straightening tool, in particular to a straightening method and a straightening tool for a large crankshaft after bending and deformation. Background technique [0002] During the production process of the crankshaft, the surface nitriding treatment is required after the journal is finely ground. Since the residual stress generated by the crankshaft during processing is released in a hot state, and the nitriding treatment will generate thermal stress, the crankshaft will be bent and deformed, and each main journal has a large jump, which cannot meet the assembly requirements and needs to be straightened. The straightening method in the prior art is to use a hydraulic straightening machine for thermal straightening, that is, after the crankshaft is heated, support the journals at both ends of the crankshaft, and use a hydraulic straightening machine to force the crankshaft to produce rever...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D3/16
Inventor 于笋李勇强
Owner GUANGXI YUCHAI MASCH CO LTD
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