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Method for pressing and shake-out for large steel casting

A technology for steel castings and press boxes, which is applied in the field of box-packing and large-scale steel casting press boxes, can solve problems such as affecting the production efficiency of factories, large physical injuries to operators, poor operability, etc., to achieve short-process production of castings, The effect of shortening production cycle and pressing time

Inactive Publication Date: 2018-03-27
王志斌
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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

Method used

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  • Method for pressing and shake-out for large steel casting
  • Method for pressing and shake-out for large steel casting
  • Method for pressing and shake-out for large steel casting

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Embodiment Construction

[0028] A method for pressing and boxing large-scale steel castings, the method comprising the following steps:

[0029] a. Determine the part of the casting that needs to be cooled and determine the temperature measurement point: use computer software to simulate the cooling sequence of each part of the casting, and determine the final solidification part of the casting, which is the part that needs to be forced to cool; or apply the modulus calculation method, the modulus The largest part is the part that requires forced cooling. Casting parts need to be cooled such as figure 1 Shown: the cooling part of the casting is (1), the (1) is the lower part of the open riser (6) of the part, and the (2) is the most thick part of the water inlet edge of the blade, which is 1000mm away from the water inlet edge Within the range, (2) is a symmetrical front and back, (1), (2) corresponding temperature measurement points are (3), (4), (5);

[0030] b. Determine the casting temperature o...

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Abstract

The invention relates to a method for pressing and shake-out for a steel casting, and particularly relates to a method for pressing and shake-out for a large steel casting. The method is characterizedby comprising the following steps: determining a casting part needing to be cooled, a temperature measurement point, and a casting temperature for starting to blow cold air, or a pressing time, designing an arbor, arranging a cooling pipe, connecting compressed air and blowing air to cool, measuring a temperature and monitoring, and carrying out shake-out. The invention provides a method which isunique and capable of realizing the purpose of rapidly cooling the casting, shortening a time from pouring to shake-out for the casting, increasing the production efficiency, and reducing the occupation rate of equipment 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...

Claims

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Application Information

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IPC IPC(8): B22D30/00B22D29/00
CPCB22D30/00B22D29/00
Inventor 王志斌程永伟邢涛陈正荣陈玉琴
Owner 王志斌
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