Thermal treatment method for multi-link lever press off-centering body

Abstract

The invention discloses a method for heat-treating eccentric bodies of a multi-link press. The method comprises the following steps: placing the eccentric bodies of the multi-link press in a heating furnace; heating to 550 to 570 DEG C, and holding for 4 to 6 hours; then, placing the eccentric bodies in a heating furnace where the furnace temperature is lower than 400 DEG C, and holding for 2 hours; heating to 600 to 650 DEG C and holding for 2 hours; further heating to 880 to 900 DEG C, holding for 5 to 7 hours, discharging and cooling to the room temperature with compressed gas; and finally, placing the eccentric bodies in the heating furnace where the furnace temperature is lower than 400 DEG C, holding for 2 hours, heating to the tempering temperature of 550 to 570 DEG C, holding for 5 to 7 hours, then, discharging and naturally cooling. The invention has the following beneficial effects: (1) the cracking rate of the eccentric bodies of the multi-link press is reduced and the qualification rate is improved; and (2) the strength and the hardness of the eccentric bodies thereof are increased, thereby meeting the actual requirements for production.

Description

technical field [0001] The invention relates to a heat treatment method for an eccentric body, in particular to a heat treatment method for an eccentric body of a multi-link press. Background technique [0002] At present, the eccentric body of the rod press for many years is easy to crack after being treated by the usual normalizing process. Defects cause a lot of stress, which cannot be completely uniform during the normalizing cooling process. Once the actual tensile limit of the defective casting is exceeded, cracks will occur until the part cracks. Contents of the invention [0003] The problem to be solved by the present invention is to provide a heat treatment method for the eccentric body of a multi-link press. After being treated by this heat treatment method, the ratio of cracking of the eccentric body of a multi-link press is greatly reduced, the qualified rate is improved, and the The strength and hardness of the eccentric body of the multi-link press. [000...

AI Technical Summary

Problems solved by technology

[0002] At present, the eccentric body of the rod press for many years is easy to crack after being treated by the usual normalizing process. The reason is that the structure of the eccentric body is complex, the effective thickness is large, the wall thickness is uneven, and the fluidity of the casting process is poor. Defects cause a lot of stress, and the normalizing cooling process cannot be completely uniform. Once the actual tensile limit of the defective casting is exceeded, cracks will occur until the part cracks