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Treatment method for removing surface scale of hollow shaft through ultrasonic pickling

A treatment method, ultrasonic technology, is applied in the field of treatment for removing scale on the surface of hollow shafts by ultrasonic pickling, which can solve the problems of easy cracking of workpieces, long soaking time, high risk, etc., and achieve the effect of reducing the risk of hydrogen embrittlement

Inactive Publication Date: 2017-06-09
JIANGSU SUNWAY PRECISION FORGING
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  • Claims
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a treatment method for removing scale on the surface of the hollow shaft by ultrasonic pickling, to overcome the above defects, and to solve the problems of long soaking time, easy cracking of the workpiece, and high risk

Method used

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  • Treatment method for removing surface scale of hollow shaft through ultrasonic pickling
  • Treatment method for removing surface scale of hollow shaft through ultrasonic pickling

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Experimental program
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Embodiment 1

[0023] Configure the pickling solution in the regularly cleaned acid tank, detect the sulfuric acid concentration and ferrous ion concentration in the acid solution, add sulfuric acid or water according to the sulfuric acid concentration and ferrous ion concentration, and control the free acid concentration in the acid solution at 16%— 18%, this free acid concentration can ensure the service life of the ultrasonic titanium plate in the pickling solution and the removal of scale on the surface of the hollow shaft. Under the same pickling treatment conditions, it is found through experiments that the mass concentration of ferrous ions > 1% can inhibit the pickling reaction, so the mass concentration of ferrous ions in the acid solution is ≤ 1%. ;

[0024] Turn on the ultrasonic transmitter, according to the acid volume 2M 3 , The quantity of material loaded is 50 pieces, estimate the required ultrasonic vibration energy, adjust the current of the ultrasonic generator at 4-5A, ...

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Abstract

The invention provides a treatment method for removing scale on the surface of a hollow shaft by ultrasonic pickling. By adjusting the ultrasonic intensity, sulfuric acid concentration, pickling temperature and ferrous ion concentration in the acid solution, the hollow shaft can be removed after 10 minutes of ultrasonic pickling treatment. surface scale. The process of the invention is relatively simple, the equipment requirements are not high, the production cycle is shortened, and the production efficiency is improved. The surface of the hollow shaft parts after ultrasonic pickling has no oxide skin, and the color is uniform. The product has basically no acid etching phenomenon, the subsequent rotary forging process of the product is stable, and the product has no hydrogen embrittlement cracking.

Description

technical field [0001] The invention belongs to the field of surface treatment of auto parts, in particular to a treatment method for removing scale on the surface of a hollow shaft by ultrasonic pickling. Background technique [0002] The hollow shaft is a lightweight development trend in the automotive industry in recent years. Its unique structure can not only meet the transmission performance requirements, but also save materials, reduce dead weight, and reduce processing costs. At present, blanks mainly rely on imports, and the procurement cycle is long and the cost is high. According to the technical requirements of the product's drawings, the process flow of the hollow shaft is: blanking → forming → annealing → passivation → swaging. Due to the particularity of the subsequent swaging process, the addition of shot blasting after annealing will strengthen the surface of the product, resulting in The large difference in hardness between the surface and the core will inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08C23G5/00
CPCC23G1/081C23G5/00
Inventor 叶德林朱卫袁海兵杨益倪亚玲
Owner JIANGSU SUNWAY PRECISION FORGING
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