Method for cleaning carbon steel casting with weight smaller than 5 tons

A cleaning method and casting technology are applied in the field of cleaning carbon steel castings, which can solve problems such as reducing production costs, and achieve the effects of reducing cost waste, reducing cleaning cycle, and reducing cleaning costs.

Inactive Publication Date: 2015-10-07
KOCEL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, provide a unique method, shorten the production cycle; solve the problem that steel castings need to be preheated before cutting the riser after boxing and shakeout, and reduce production costs. Cleaning method for carbon steel castings less than 5 tons

Method used

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Embodiment Construction

[0015] A method for cleaning carbon steel castings weighing less than 5 tons, the method is as follows

[0016] 1) High temperature packing

[0017] In general, as long as the cooling rate of the castings after boxing is well controlled, the high-temperature boxing temperature of small and medium-sized carbon steel castings can be selected at AC1-(50~100)°C, but considering the complex structure of some castings, if the boxing temperature If it is too high, microcracks may occur, resulting in unnecessary cost losses. Therefore, for small and medium-sized carbon steel castings with complex structures, the boxing temperature is usually selected at AC1-(100~150)°C. Finally, it is determined that the boxing temperature of small and medium-sized carbon steel castings is between 550 and 650°C.

[0018] 2) cooling

[0019] After the high-temperature boxing of the casting, it is immediately lifted to the sand shakeout area, and the large sand blocks on the surface of the casting ar...

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PUM

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Abstract

The invention relates to a method for cleaning carbon steel casting, in particular to a method for cleaning a carbon steel casting with the weight smaller than 5 tons. The method is characterized by including the steps that high-temperature knockout is firstly carried out; the casting is instantly lifted to a shakeout area after high-temperature knockout is carried out, large sand lumps on the surface of the casting are smashed to fall off; when the casting is cooled to 300 DEG C to 350 DEG C, the casting is lifted to a riser cutting area, and burnt-on sand and porcelain tubes which can influence riser and pouring gate cutting are eliminated; after cleaning of the burnt-on sand and the porcelain tubes is completed, the temperatures of the cutting part and the other parts of the casting are measured respectively, and riser cutting is carried out when the temperature of the cutting part is higher than 150 DEG C, and the temperatures of the other parts are larger than 100 DEG C; after riser cutting is finished, the casting is transferred to the interior of a heat treatment furnace, and furnace charging is carried for performance heat treatment. The method is unique, and the production period is shortened; the problem that riser cutting needs to be carried out through preheating after knockout and shakeout are carried out on the steel casting is solved, and the production cost is reduced.

Description

technical field [0001] The invention relates to a cleaning method for carbon steel castings, in particular to a cleaning method for carbon steel castings weighing less than 5 tons. Background technique [0002] When the weight of steel castings is less than 5 tons, they are generally called small and medium steel castings. Different from the production of large steel castings, the production of small and medium steel castings is batched. The existing production process of small and medium steel castings is : Modeling, core making, box closing, pouring, cooling, boxing, cutting risers, performance heat treatment, gouging, relief grinding, shot blasting, processing and welding, etc. Production practice shows that according to this production process, the production cycle of small and medium-sized steel castings takes about 6 months, and the production cycle from pouring to performance heat treatment is generally about 1 month. From pouring to performance heat treatment, the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D31/00
Inventor 罗永建李少雨田成刚叶军马文治唐钟雪闫新飞冯周荣杨建
Owner KOCEL STEEL
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