Vacuum pouring basket sliding mechanism and its operation method

Abstract

The present invention relates to vacuum molten steel casting technology, and is especially one kind of sliding mechanism for vacuum casting pouring basket and its operation process. The sliding mechanism includes sliding gate, hydraulic cylinder, link rod, lower sliding board with porous plug connected to the argon pipeline, protecting board connected to the pouring basket, sealing member set on the side wall of the pouring basket, and circular cooling pipe penetrating the side wall of the pouring basket. The operation process includes the steps of: blowing argon, pouring molten steel to the pouring basket, regulating argon pressure, pumping vacuum and opening the sliding gate for vacuum pouring. The present invention has the advantages of no plunger caused trouble, smooth running of the sliding member, long service life of the pouring basket and high internal quality of steel ingot.

Description

technical field [0001] The invention relates to the technical field of vacuum casting of molten steel, in particular to a vacuum casting tundish sliding mechanism and an operation method thereof. Background technique [0002] Vacuum pouring of molten steel can ensure the cleanliness of steel castings and prevent secondary pollution of molten steel. The current vacuum pouring uses stopper rods for pouring. This conventional method has many defects: [0003] 1. Due to the longer stopper rod, the larger the tundish and the longer the stopper rod, it is difficult to install the stopper rod in the tundish. [0004] 2. After installing the stopper, it is required to bake the tundish. During the baking process, the temperature needs to be strictly controlled. If the temperature is too high, the stopper will be bent; Close the nozzle smoothly, affect the plug to close the nozzle, and the effective rate of actual stopper rod closing is less than 50%. [0005] 3. Since the stopper ...

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Problems solved by technology

[0003] 1. Due to the longer stopper rod, the larger the tundish and the longer the stopper rod, it is difficult to install the stopper rod in the tundish

[0004] 2. After installing the stopper, it is required to bake the tundish. During the baking process, the temperature needs to be strictly controlled. If the temperature is too high, the stopper will be bent; The smooth closing of the water port affects the closure of the plug head, and the effective rate of the actual stopper rod closing is less than 50%.

[0005] 3. Since the stopper cannot be opened, the molten steel in the tundish cannot be injected into the mold, resulting in a waste of molten steel. Sometimes all the steel slag in the tundish is injected into the mold, which increases the inclusions in the steel and has a great impact on the internal quality of the ingot. In severe cases, the steel ingot may be scrapped due to the increase of the total amount of inclusions

However, this sliding nozzle cannot be simply used for vacuum casting tundish, because during vacuum casting, the tundish and the vacuum chamber are in a sealed state, and the sliding nozzle mechanism is in the high-temperature radiation of 1100-1200 ° C, so it is difficult to guarantee The sliding mechanism does not deform; the installation and sealing of the sliding mechanism have its own special problems that need to be solved

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