Liquid nitrogen cooling device and method for roll forging die of automobile front axle

Abstract

The invention discloses a liquid nitrogen cooling device for an automobile front axle roll forging die.The liquid nitrogen cooling device comprises a plurality of liquid nitrogen ejectors located around the roll forging die, a plurality of position sensors located on a roll forging machine and an infrared thermometer used for measuring the temperature of the roll forging die; the liquid nitrogen ejectors are connected with a liquid nitrogen storage tank through a vacuum heat preservation and thermal isolation pipe; each nitrogen ejector corresponds to an automatic control valve; a safety control valve is arranged at an outlet of the liquid nitrogen storage tank; the infrared thermometer and the position sensors are connected with a control center, and the control center controls the switch-on degree, switch-on and switch-off of the automatic control valve and the safety control valve.The invention further provides a liquid nitrogen cooling method for the automobile front axle roll forging die.According to the liquid nitrogen cooling device and method for the automobile front axle roll forging die, the production quality and the production efficiency of automobile front axles can be guaranteed.

Description

technical field [0001] The invention relates to the field of metal profile processing, in particular to a liquid nitrogen cooling device and method for a roll forging die of an automobile front axle. Background technique [0002] The rapid development of my country's automobile industry has put forward higher requirements for the production efficiency and quality of the automobile front axle. However, the shape of the front axle of the car is complex, and it will bear a large impact load under heavy load conditions, especially under harsh road conditions. Therefore, the requirements for its strength, stiffness and fatigue life are relatively high. Roll forging is a new process that has been introduced into the forging industry by longitudinal rolling in recent decades and has been continuously developed. This process has high production efficiency and material utilization, good quality of roll forgings, and low capital investment in equipment. [0003] However, there are st...

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Problems solved by technology

[0003] However, there are still many defects in the current front axle roll forging production process. For example, the temperature of the forging itself is high, and it is often heated to above 1100°C in the medium frequency induction heating furnace. During the working process of the mold and the forging, due to The deformation of the forging will release a lot of heat, and the surface temperature of the mold will increase to more than 300°C due to long-term work, and high temperature will be formed locally, resulting in the phenomenon of overburning on the surface of the forging, which seriously affects the quality of the product and reduces the production. efficiency, increased scrap rate

In the existing front axle roll forging production process, air cooling or water cooling is usually used for cooling, but both cooling methods have defects

[0004] The air cooling speed is slow, the effect is poor, and the product will still be overheated. In order to ensure the quality of the front axle of the car, the company has to interrupt production, which seriously reduces the production efficiency

In the water-cooling method, the cooling water will flow to the forging through the surface of the die, so that the temperature of the forging will change greatly during the roll forging process. When the roll forging is divided, the metal often cannot flow according to the ideal distribution method and cannot fill the shape of the die. The cavity will cause the problems of uneven material distribution, insufficient filling, and overlapping of materials in the forgings, which will affect the quality of the front axle of the car; and the temperature of the forgings will drop too much, which will make the forgings in the die forging, bending, correction and other processes after roll forging There are often various problems that affect the quality of the product

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