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A Technological Method for Shortening the Production Cycle of Large Steel Castings

A technology of production cycle and process method, which is applied in the field of casting, can solve the problems that the production cycle cannot meet the order requirements, increase the cost of heat treatment, prolong the production cycle, etc., and achieve the effects of avoiding secondary sintering, shortening the heat treatment time, and reducing the cost of heat treatment

Active Publication Date: 2019-11-19
LIAONING FU-AN HEAVY INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large-scale steel castings generally need 20-30 days of slow cooling time before they can be boxed, plus sand cleaning, complete annealing and cutting riser subsidies, etc., 30-40 days after pouring can be transferred to the processing process, such a long production cycle Unable to meet order requirements
2) The traditional sand cleaning method is to clean the castings with temperature, and do not shot blast after sand cleaning, so that the sand is not cleaned thoroughly, and secondary sintering is easy to occur in the subsequent heat treatment process, resulting in map-shaped chemical sticky sand on the surface of the casting. Increased difficulty and time to clean up
3) Castings after sand cleaning generally need to be fully annealed for at least 3 days, which not only prolongs the production cycle, but also increases additional heat treatment costs

Method used

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  • A Technological Method for Shortening the Production Cycle of Large Steel Castings

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Effect test

Embodiment 1

[0032] In this embodiment, the large-scale steel castings are non-plate low-alloy steel castings, and there are 6 layers of sand boxes with equal heights. The production process is as follows:

[0033] 1) On the 3rd day after the casting is poured, use a crane to hoist and remove the first layer of sand box at the riser, but ensure that there is at least 50mm thick sand around the riser to avoid the riser being exposed to the air; remove the first layer on the 4th day Two-layer sand box; the remaining four-layer sand box;

[0034] 2) Dig a temperature measurement channel at the root of the riser, measure the temperature with a portable temperature measurement gun, when the temperature is lower than 400°C, lift the casting from the sand mold to a height of 500mm from the top surface of the sand mold, stay in the air for 15 minutes, and then Put it back into the sand mold. After putting it back, make sure that the casting body is not exposed, and the riser should also be covered...

Embodiment 2

[0043] In this embodiment, the large-scale steel castings are non-plate carbon steel castings, and there are 6 layers of sand boxes with equal heights. The production process is as follows:

[0044] 1) On the 3rd day after the casting is poured, use a crane to hoist and remove the first layer of sand box at the riser, but ensure that there is at least 50mm thick sand around the riser to avoid the riser being exposed to the air; remove the first layer on the 4th day The second layer of sand box, the third layer of sand box was removed on the 5th day; the remaining three layers of sand box;

[0045] 2) Dig a temperature measuring channel at the root of the riser, measure the temperature with a portable temperature measuring gun, when the temperature is lower than 400°C, hang the casting from the sand mold to a height of 400mm from the top surface of the sand mold, stay in the air for 10 minutes, and then Put it back into the sand mold. After putting it back, make sure that the c...

Embodiment 3

[0054] In this embodiment, the large-scale steel castings are plate-type carbon steel castings, and there are 4 layers of sand boxes with equal heights. The production process is as follows:

[0055] 1) On the 3rd day after the casting is poured, use a crane to hoist the first layer of sand box at the riser, but ensure that there is at least 50mm thick sand around the riser to prevent the riser from being exposed to the air; the remaining two layers of sand boxes no longer removed;

[0056] 2) Dig a temperature measuring channel at the root of the riser, measure the temperature with a portable temperature measuring gun, when the temperature is lower than 400°C, hang the casting from the sand mold to a height of 300mm from the top surface of the sand mold, stay in the air for 5 minutes, and then Put it back into the sand mold. After putting it back, make sure that the casting body is not exposed, and the riser should also be covered with sand;

[0057] 3) Measure the temperatu...

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Abstract

The invention relates to a technology method for shortening the production period of a large-scale casting steel piece. The technology method for shortening the production period of the large-scale casting steel piece comprises the steps of after a casting piece is poured for three days, gradually removing part of sand box on the upper layer; measuring the temperature of a root part of a dead head, hoisting the casting piece out from a sand mold when the temperature is lower than 400 DEG C, air cooling, and then putting back into the sand mold; and shaking out after the measured box is lower than the corresponding temperature again, cooling the shake-out casting piece to the room temperature, then cleaning and shot blasting, cutting the dead head after preheating the casting piece, and after cutting the dead head, a water gap and patches, carrying out performance heat treatment on the casting piece. According to the technology method for shortening the production period of the large-scale casting steel piece provided by the invention, through accelerating the cooling speed after the casting piece is solidified, and by adopting the methods such as cleaning and shot blasting at roomtemperature, and canceling complete annealing, the technological process is simplified, and the production efficiency is improved, so that the aim of shortening the production period is achieved, andthe method has universal adaptability on carbon steel and low-alloy steel casting pieces.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a process method for shortening the production cycle of large steel castings. Background technique [0002] In recent years, with the development of the equipment manufacturing industry, higher requirements have been put forward for casting technology. Not only has the construction period been greatly reduced, but the order price has also been continuously reduced. Therefore, it is necessary to tap the potential within the foundry industry. According to the characteristics of castings, on the premise of ensuring quality Simplify the production process and reduce production costs. [0003] At present, the main factors affecting the production schedule of steel castings are as follows: 1) Due to the large shrinkage ratio of steel castings, free shrinkage occurs during the solidification process. In order to prevent excessive cooling and cracks, the traditional method is to Cool sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00C21D1/84B22D29/04B22D31/00
CPCB22D29/04B22D31/002C21D1/84C21D6/00
Inventor 杨程坤穆建华孙吉栋韩福昊刘建
Owner LIAONING FU-AN HEAVY INDUSTRY CO LTD
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