Torsion beam high-frequency quenching method capable of eliminating abnormal sound

Abstract

The invention provides a torsion beam high-frequency quenching method capable of eliminating the abnormal sound, stress borne by all parts of a torsion beam under the real road condition is analyzed through analogue simulation and is compared with the strength of the torsion beam in the non-quenched state, quenching treatment is conducted on the non-attached areas, bearing high stress, of the two ends, and the attached area bearing low stress is not subjected to quenching treatment. The torsion beam high-frequency quenching method has the advantages that the real stress condition of the torsion beam is analyzed through analogue simulation, so that the bearing capacity requirement of each part of the torsion beam is determined, heat treatment quenching is only conducted on the two non-attached ends of the torsion beam, heat treatment is not conducted on the middle V-shaped area formed by attachment, the attached area is prevented from deforming in heat treatment, and gaps are avoided, so that the abnormal sound caused by friction due to the gaps is avoided.

Description

technical field [0001] The invention relates to the technical field of torsion beam quenching processing, in particular to a high frequency quenching method of a torsion beam capable of eliminating abnormal noise. Background technique [0002] for figure 1 The shown automobile torsion beam structure has hollow tubes with relatively regular shapes at both ends, and the middle part is gradually deformed to form figure 2 The V-shaped structure shown, and the area where the tube wall is bent and fitted has no gap; the heat treatment method of the torsion beam in the prior art can refer to the heat treatment of the high-strength thermal imaging torsion beam for automobiles disclosed in the patent application for invention publication number CN108504985A The method includes pretreatment, carburizing treatment, quenching treatment, cleaning treatment, tempering treatment, etc., wherein in the carburizing treatment, carbon-containing gas is introduced into the non-oxidizing protec...

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Problems solved by technology

[0002] for figure 1 The car torsion beam structure shown in the figure has hollow tubes with relatively regular shapes at both ends, and the middle part is gradually deformed to form figure 2 The V-shaped structure is shown, and there is no gap in the area where the tube wall is bent and bonded; the heat treatment method of the torsion beam in the prior art can refer to the heat treatment of the high-strength thermal imaging torsion beam for automobiles disclosed in the invention patent application with the publication number CN108504985A The method includes pretreatment, carburizing treatment, quenching treatment, cleaning treatment, tempering treatment, etc., wherein in the carburizing treatment, a carbon-containing gas is passed into a non-oxidizing protective gas to increase the carbon content of the torsion beam to increase the strength of the torsion beam; In the quenching process, in order to prevent decarburization of the torsion beam, in this scheme, the torsion beam is immersed in an oil pool to cool, but this quenching method takes a long time, and the material consumption of the oil pool is large, and the cost of heat treatment is high

[0003] In the prior art, the high-frequency quenching method is used to process the torsion beam. First, the induction coil is used to heat the part to 900°C instantaneously, and then it is sprayed and cooled immediately, and the whole is heated and then cooled. Stable, the V-shaped zone wall may deform to produce gaps (such as image 3 ), the design requires that the two inner walls of the V-shaped area within the width of 600mm in the middle must be attached, otherwise, during the loading and use of the torsion beam, abnormal noise will be generated due to the friction of the inner wall due to the gap; in addition, during high-frequency quenching, the torque Oxidation and decarburization will occur on the surface of the beam, and there will be a large amount of oxide skin on the inner and outer surfaces

The oxide scale on the outer surface can be eliminated by shot blasting, but the oxide scale on the inner surface of the V-shaped zone cannot be eliminated, and it will remain in the gap between the inner walls of the two products in the V-shaped zone

After the torsion beam is welded and installed, since the two inner walls of the V-shaped area will slide and deform relative to each other, the oxide scale in the residual gap will rub against the two inner walls, which may cause abnormal noise

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