Casting Method for Preventing Orange Peel Defects on the Surface of Large Steel Castings

A steel casting and orange peel technology is applied in the field of casting to prevent orange peel defects on the surface of large steel castings. It can solve the problems of restricting production efficiency and increasing production costs, so as to improve the efficiency of subsequent cleaning, reduce workload, The effect of eliminating orange peel defects

Active Publication Date: 2019-10-11
KOCEL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this mode of operation seriously restricts the production efficiency of the subsequent order and increases the production cost

Method used

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Embodiment Construction

[0014] An embodiment of the present invention provides a casting method for preventing orange peel defects on the surface of large steel castings, comprising the following steps:

[0015] Molding: Put the steel casting mold into the sand box, flow sand, and release the mold after the sand mold is compacted to form a steel casting sand mold;

[0016] Spray paint: spray paint on the surface of the cavity of the sand mold of the steel casting by using a spray paint machine. Spray paint includes spraying the first layer of paint layer and spraying the second layer of paint layer. The paint used in the first layer of paint layer is corundum powder paint The coating used in the second coating layer is zircon powder coating, and the method of spraying the first coating layer is to spray corundum powder coating on the surface of the steel casting cavity with a spraying machine, and the spraying thickness is 0.2-0.3mm , the method of spraying the second coating layer is to use a sprayi...

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Abstract

The invention relates to a casting method for preventing a large-scale steel casting surface from generating orange peel defects. The casting method includes the steps of modeling, coating spraying and mould assembling pouring. The step of coating spraying includes spraying of a first coating layer and spraying of a second coating layer, coating adopted in the first coating layer is emery powder coating, coating adopted in the second coating layer is zircon powder coating, the method for spraying the first coating layer is that the emery powder coating is sprayed to the surface of a steel casting cavity through a spraying machine, the spraying thickness is 0.2 mm to 0.3 mm, the method for spraying the second coating layer is that the zircon powder coating is sprayed to the first coating layer through the spraying machine, and the spraying thickness if 0.2 mm to 0.3 mm. The zircon powder coating layer and sand mould chromite sand are isolated through the emery powder coating layer, the zircon powder coating layer is not in direct contact with the chromite sand, and therefore the aim that the emery powder coating and molten steel are not in direct contact is achieved, and the problem of reactive sintering of the zircon powder coating and the chromite sand is avoided.

Description

technical field [0001] The invention relates to the technical field of sand casting paint brushing, in particular to a casting method for preventing orange peel defects on the surface of large steel castings. Background technique [0002] Traditional large-scale steel castings are molded with resin sand, and the surface sand is all made of chromite sand, the main component of which is Cr 2 o 3 · Fe 2 o 3 , the back sand is all made of silicon, brush or spray the corundum powder coating twice after the steel casting sand mold is demoulded, the total thickness is 0.4~0.6mm, and then cast after 24 hours in the oven. Among them, cylinder steel castings are high-alloy or low-alloy products. The pouring temperature reaches 1560-1570°C, the wall thickness of the casting is 60-500mm, and the gross weight of the casting is 12-80t. With the addition of the pouring system, the actual tonnage of the casting will reach About 2 times its gross weight. After falling sand shot blasting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C23/02B22C3/00
Inventor 赵健东冯周荣马瑞杨磊
Owner KOCEL STEEL
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