Grain refining stirring device for die steel casting

Abstract

The invention provides a grain refining and stirring device for die steel casting, and mainly relates to the field of die steel casting equipment. A grain refining stirring device for die steel casting comprises a box body, a stirring motor is installed on the top face of the box body, a rotating shaft of the stirring motor penetrates through the top face of the box body, a rotating disc is installed at the bottom end of the rotating shaft of the stirring motor, two strip-shaped grooves are formed in the bottom face of the rotating disc, and the two strip-shaped grooves are distributed front and back. And a transmission device is mounted in each strip-shaped groove. The stirring device has the beneficial effects that power is provided through the stirring motor to drive the two rotating shafts to rotate so as to stir molten steel, meanwhile, power is provided through the transmission device, the positions of the two rotating shafts can be adjusted, then the two rotating shafts can be located at different stirring positions, the liquidity of the molten steel is improved, and the stirring efficiency is improved. Therefore, formation of columnar crystals is reduced, a large number of fine isometric crystals with uniform sizes are formed, and the service life of the mold is prolonged.

Description

technical field [0001] The invention mainly relates to the field of mold steel casting equipment, in particular to a grain refining stirring device for mold steel casting. 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 the production co...

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

Images