Integrated temperature-control cooling equipment and cooling method thereof

Abstract

The invention discloses integrated temperature-control cooling equipment and a cooling method thereof and belongs to the technical field of cooling of non-quenched and tempered steel. The integrated temperature-control cooling equipment comprises a feeding-discharging area, a rapid cooling area, a slow cooling area and an air cooling area which are in sequential connection, and the air cooling area is connected onto the feeding-discharging area to form a closed circulation structure. The cooling equipment is simple in structure, high in degree of automation, simple and convenient to operate and suitable for popularization and application. The cooling method includes the steps: 1, hooking forgings; 2, rapidly cooling the forgings to the temperature ranging from 630 DEG C to 670 DEG C in the rapid cooling area; 3, decreasing the temperature of the forgings to 280 DEG C to 320 DEG C in the slow cooling area; and 4, performing air cooling for the forgings to enable the temperature of the forgings to be lower than 100 DEG C in the air cooling area, returning the forgings to the feeding-discharging area and taking the forgings down. The cooling method is simple, convenient, applicable and high in production efficiency, production cost can be greatly reduced, and internal and external quality of the forgings after cooling can be guaranteed.

Description

technical field [0001] The invention relates to a non-quenched and tempered steel cooling technology, in particular to a post-forging cooling technology for non-quenched and tempered steel forgings. Background technique [0002] Non-quenched and tempered steel is widely used in automotive parts, especially crankshafts, connecting rods and other parts. In order to ensure that the surface of crankshafts, connecting rods and other parts obtains sufficient hardness after high-frequency quenching, there is no ferrite in the hardened zone. Steel It is necessary to ensure a sufficiently high carbon content in the forging process, and take measures in the forging process to prevent large pieces of ferrite from appearing on the surface of the blank. There are two conventional post-forging cooling methods: slow cooling in an incubator and natural air cooling. That is to say, the forged high-temperature crankshaft blank is calibrated and placed in an incubator for slow cooling or dire...

AI Technical Summary

Problems solved by technology

That is to say, the forged high-temperature crankshaft blank is calibrated and placed in an incubator for slow cooling or directly placed in the air for natural cooling. The conventional method requires multiple slow cooling in a multi-stage incubator to ensure its requirements. At the same time, the conventional method still has The straightness deviation of forgings is large, that is, the deformation is large, which not only cannot meet the size requirements of forgings, but also increases a lot of calibration and tempering workload

[0003] Chinese invention patent application, the application number is 200310111656.2, the application date is December 26, 2003, the name is non-quenched and tempered steel engine crankshaft cooling method after forging, discloses a non-quenched and tempered steel forging cooling method, to a certain extent It can improve the mechanical properties of forgings, but in the process of using this method, the forgings need to be naturally cooled to 600°C in the natural air cooling zone, and then enter the heat preservation and slow cooling zone for slow cooling. During the cooling process of the forgings in the natural air cooling zone, the cooling rate cannot Control, when the temperature is low in winter, the cooling is fast, and when the temperature is high in summer, the cooling is slow. Since the natural air cooling area is greatly affected by the external temperature, it may cause irregular metallographic changes in the forging, and it is impossible to control the metallographic changes to meet the predetermined requirements. , and the crystal structure inside the forging is not refined enough and not uniform, which affects the mechanical properties of the forging

Images