Integral quenching method of overlong and superhard high-wear-resistant alloy tool steel guide rail

Abstract

The invention discloses an integral quenching method of an overlong and superhard high-wear-resistant alloy tool steel guide rail. The integral quenching method comprises the following steps: (1) processing alloy tool steel before quenching; (2) quenching, wherein the preheating temperature is kept at 800-850 DEG C, the heating temperature is kept at 950-1200 DEG C, the heat is preserved for 15-50min, air with room temperature is used as the quenching medium, and the quenching temperature is controlled within + / -1 DEG C; (3) straightening: taking out a workpiece to carry out straightening operation when the workpiece is integrally quenched and cooled to 220+ / -5 DEG C before martensite transformation, and controlling the length at + / -0.20 / 1000mm; (4) tempering, wherein the furnace temperature is controlled at 500-580 DEG C; (5) roughly and finely grinding the shape of the workpiece and deburring; (6) straightening, wherein the length is controlled at + / -0.20 / 1000mm; and (7) secondarily tempering, wherein the furnace temperature is controlled at 500-580 DEG C. The guide rail produced by using the process disclosed by the invention overcomes defects of easiness to wear, multiple seams and low precision of a guide rail manufactured by using the traditional process.

Description

[0001] technical field [0002] The invention relates to a process method for quenching guide rails, in particular to an overall quenching method for super-long, ultra-hard and high-wear-resistant alloy tool steel guide rails used in large-scale assembly lines. Background technique [0003] At present, the guide rails used in large-scale production lines in the automotive industry are generally made of quenched and tempered steel or ordinary alloy steel hardened by high and medium frequency quenching processes. The hardness value of quenched and tempered steel guide rail is generally around HRC25°, while the hardness of ordinary alloy steel guide rail hardened by high and medium frequency quenching process does not exceed HRC50°. Due to the heavy load and frequent reciprocation of the working platform on the assembly line guide rail, the guide rails produced by the prior art all have the following defects: [0004] 1. The hardness is not high or the hardness layer is thin, ...

AI Technical Summary

Problems solved by technology

[0004] 1. The hardness is not high or the hardness layer is thin, easy to wear, and the service life of the guide rail is short

Quenched and tempered steel guide rail is quenched as a whole, but its hardness is not high and it is easy to wear

Although the hardness of the guide rails hardened by high and medium frequency quenching is relatively high, due to the limitation of the process, the hardness layer is only 1~2mm thick on the surface, and the depth is different, so the service life is relatively short

[0005] 2. Most of the absolute length of each guide rail is 1~2 meters, and there are many guide rail joints on the tens of meters long assembly line, which affects the accuracy of assembly line production and generates relatively large noise