Induction hardening method and induction apparatus for high strength steel special shape rear axle cross beam

Abstract

A purpose of the present invention is to provide an induction hardening method and an induction apparatus for a high strength steel special shape rear axle cross beam. The induction apparatus comprises induction coils, wherein the problems that the top ends of both side arms of a work-piece produce overheating and decarbonization phenomena caused by too high local temperature due to the horn effect and the proximity effect and the temperature of the bottom of the V-shaped groove can not achieve the hardening effect can be avoided. According to the present invention, with looking from the axial direction, the induction coil comprises a first end heat section corresponding to the opening side of a V shape, a second end head section corresponding to the bottom side of the V shape, and middle sections respectively corresponding to both side arms of the V shape, wherein the two middle sections are connected with the second end head section respectively through a transition section, and are respectively connected with the first end head section, various connection positions are subjected to smooth transition, the middle sections are perpendicular to the first end head section and the second end head section, the transition section is inclined relative to the middle section and the second end head section, the second end head section, the middle sections and the transition sections are the smooth positions, the inner side of the middle portion of the first end head section projects toward to the internal of the V shape, the outer side of the middle portion of the first end head section recesses inwardly to form a profiling groove, a magnetic conductor is arranged inside the profiling groove, and the first end head portion excluding the middle portion is the smooth position.

Description

technical field [0001] The invention relates to a heat treatment process and heat treatment equipment for the crossbeam of the rear axle of an automobile. Background technique [0002] The use of high-strength and ultra-high-strength steel to achieve lightweight automobiles has become a major trend in the development of the modern automobile industry. High-strength steel is widely used in automotive structural parts, such as beam parts, due to its high weight reduction potential, high impact absorption energy, high formability, and low planar anisotropy. According to international research on ultra-light steel vehicles, steel with a yield strength (ReL) of 210-550MPa is called high-strength steel, and steel with a yield strength greater than 550MPa is called ultra-high-strength steel. [0003] Automobile special-shaped rear axle beam parts such as Figure 1 to Figure 4 As shown, it is a special-shaped part, and the part is left-right symmetrical from the A-A section. Gauge...

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Problems solved by technology

[0004] use Figure 5 and Image 6 There are deficiencies in the induction hardening of the shown inductor. The inductor includes upper and lower circular induction coils 1 and a connecting pipe 2 electrically connected to the induction coil 1. The current 3 passes through the connecting pipe 2, and the upper and lower induction coils 1 are located in the ring. The workpiece 4 in 1 is quenched, and the heat treatment performance at the sharp corner of the workpiece is not ideal

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