A method for pressing and boxing large steel castings

Abstract

The invention relates to a box pressing and mold dismantling method of a steel casting, in particular to the box pressing and mold dismantling method of a large-scale steel casting. The box pressing and mold dismantling method of the large-scale steel casting is characterized by including the following steps that a casting position needing to be cooled is determined, a temperature measuring point is also determined, casting temperature or box pressing time when cool air begins to blow is determined, an arbor is designed, a cooling pipe is arranged, compressed air is connected to conduct air blowing and cooling, temperature measurement monitoring is conducted, and mold dismantling is carried out. The box pressing and mold dismantling method of the large-scale steel casting is unique in method, and can achieve the purpose that castings can be cooled quickly, shorten the box pressing time of the castings from pouring to mold dismantling, improve production efficiency, and reduce the occupancy rate of device and site resources.

Description

technical field [0001] The invention relates to a method for pressing and boxing a steel casting, in particular to a method for pressing and boxing a large steel casting. Background technique [0002] For large steel castings, especially high-alloy steel castings, due to factors such as structural transformation and stress release caused by large structural differences in castings, there are currently two pressing and boxing processes. [0003] The first is the conventional method: after pouring, the casting needs to be kept warm in the sand mold and cooled slowly. After the casting is completely solidified and cooled to below 100°C, the structure is completely transformed, and the stress caused by the different structures of the casting is completely released, then the box is opened. Shakeout, the entire cooling cycle takes more than 25 days. During this period, the castings are in a stagnant state. For castings with urgent delivery cycle requirements, this stagnation has a...

AI Technical Summary

Problems solved by technology

[0003] The first is the conventional method: after pouring, the casting needs to be kept warm in the sand mold and cooled slowly. After the casting is completely solidified and cooled to below 100°C, the structure is completely transformed, and the stress caused by the different structures of the casting is completely released, then the box is opened. Shakeout, the entire cooling cycle takes more than 25 days. During this period, the castings are in a stagnant state. For castings with urgent delivery cycle requirements, this stagnation has a greater impact; and the stagnant castings occupy the equipment. , Site resources, affect the production efficiency of the entire factory

[0004] The second method adopts over-high temperature, that is, 580°C boxing method. The disadvantage of this method is that the high temperature will cause great harm to the operator, and the high temperature boxing has extremely strict requirements on the operation control of the process. If any link is not well connected, the casting will be damaged. There will be defects such as cracks and deformation

This process has poor field operability and is difficult to promote on a large scale

[0005] So far, there is no way to overcome the above drawbacks

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