Mixing device for die steel casting and capable of reducing segregation degree

Abstract

The invention provides a mold steel casting stirring device capable of reducing the segregation degree, and mainly relates to the field of mold steel casting equipment. The mold steel casting stirring device capable of reducing the segregation degree comprises a box body, a motor is installed on one side of the top face of the box body, a motor rotating shaft penetrates through the box body, a first gear is installed at the bottom end of the motor rotating shaft, and a second gear is rotationally installed on the inner wall of the top of the box body. The device has the beneficial effects that through cooperation of the first telescopic rod and the second telescopic rod, the positions of the two stirring plates can be adjusted, then the two stirring plates can be in different stirring states, the liquidity of molten steel is improved, the temperature of the molten steel at the edge and the center is uniform, and the molten steel quality is improved. And the components of the molten steel are more uniform under the stirring action, so that the formation of columnar crystals is reduced, a large number of fine isometric crystals with uniform sizes are formed, the component segregation degree of a hot work die steel cast ingot is reduced, and the service life of the die is further prolonged.

Description

technical field [0001] The invention mainly relates to the field of mold steel casting equipment, in particular to a stirring device for mold steel casting which reduces segregation degree. Background technique [0002] 4Cr5MoSiV1 (H13) hot work die steel, as a chromium-based air-cooled hardening hot work die steel, is widely used in hot forging dies, hot extrusion dies and large die-casting die materials, and is currently one of the most used hot work die steels in the world , H13 hot work die steel is often used in high-temperature and high-pressure environments in industrial production. It withstands high temperature and high pressure, strong friction and cyclic impact for a long time. If there is no high strength and toughness, the mold itself will produce fatigue cracks and fail or even break. , which greatly reduces the service life of the die, so how to improve the strength and toughness of H13 hot work die steel so as to improve the service life of the die and reduce...

AI Technical Summary

Problems solved by technology

[0002] 4Cr5MoSiV1 (H13) hot work die steel, as a chromium-based air-cooled hardening hot work die steel, is widely used in hot forging dies, hot extrusion dies and large die-casting die materials, and is currently one of the most used hot work die steels in the world , H13 hot work die steel is often used in high-temperature and high-pressure environments in industrial production. It withstands high temperature and high pressure, strong friction and cyclic impact for a long time. If there is no high strength and toughness, the mold itself will produce fatigue cracks and fail or even break. , which greatly reduces the service life of the die, so how to improve the strength and toughness of H13 hot work die steel so as to improve the service life of the die and reduce the production cost is an important research direction

The traditional production of H13 hot work die steel adopts the method of gravity casting, relying on gravity to make the molten steel solidify naturally in the mold. Since the temperature of the molten steel in the center of the mold is inconsistent with that at the edge, there is a large temperature gradient, and natural cooling and solidification will occur in the casting mold. A large number of columnar crystals are formed in the ingot, which greatly reduces the performance of H13 hot work die steel; at the same time, due to the high content of alloy elements in H13 hot work die steel, composition segregation is easy to occur during solidification, and the core structure is extremely uneven. Coarse liquid carbides are formed along the grain boundaries. If not improved, it will cause strong stress concentration in the steel matrix, thereby generating microcracks and rapidly diffusing into large cracks in the matrix, eventually leading to fatigue failure

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