Roots vacuum pump in die steel of application
Roots vacuum pump is a vacuum pump without internal compression, can be widely used in petroleum, chemical, metallurgy, textile and other industries. Die steel is used to make cold die, hot forging die, die casting die steel. Mould is the main tool for manufacturing parts in mechanical manufacturing, radio instrument, motor, electric appliance and other industrial sectors. The quality of the mold directly affects the quality of the pressure processing process, the precision of the product output and production cost, and the quality and service life of the mold in addition to a reasonable structure design and processing accuracy, mainly by the mold material and heat treatment. This paper intends to introduce the roots vacuum pump in the application of steel die related content, understand its actual effect.
The purpose of this paper is to solve the problems in the manufacturing process of die steel, and provide a vacuum heat treatment method of die steel, so that the die has good wear resistance, hardness, tensile strength and yield strength.
Vacuum heat treatment is a new heat treatment technology combining vacuum technology and heat treatment technology. The vacuum environment where vacuum heat treatment is located refers to the atmosphere environment less than one atmosphere, including low vacuum, medium vacuum, high vacuum and ultra-high vacuum. Vacuum heat treatment actually belongs to atmosphere control heat treatment. Mold is used in industrial production for injection molding, blow molding, extrusion, casting, molding, smelting, stamping, stretching and other methods to obtain the required products of various molds and tools. Cold stamping die is installed in the press, placed in the sheet metal at room temperature to apply deformation force, make it produce deformation, so as to obtain a certain shape, size and performance of the product parts of the special tool. In order to improve the wear resistance, hardness and corrosion resistance of the working surface of the die, it is necessary to conduct heat treatment on the stamping die.
In vacuum, there are two differences between vacuum heat treatment and general heat treatment:
In vacuum, due to the rareness of gas and its low chemical property, its activity is almost “blunt” at higher vacuum degree. Therefore, the reaction of traditional solid gas, such as oxidation, reduction and decarbonization, will be much slower in vacuum than in atmosphere at the same temperature.
In a vacuum, the opportunity is provided to remove adsorbed gases from the material or to decompose and remove existing oxides or compounds on the surface of the treatment.
The beneficial effects of roots vacuum pump in die steel are as follows:
Roots pump carburizing treatment on the mold twice to make the carburizing effect better, the thickness of the carburizing layer is 0.1-0.2mm, and the carbon content of the carburizing layer from the outside to the inner layer gradually decreases, increase the hardness of the mold surface to increase its wear resistance; The hardness and abrasion resistance of the treated die surface, as well as the good tensile strength and yield strength, and the rejection rate is low.