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Large cast steel long cylindrical piece feeding process method

A process method and a long tube technology, which are applied in the field of feeding technology of large cast steel long tubes, can solve the problems of weakened sequential solidification, increased processing costs, and shrinkage porosity, so as to reduce the workload of gas cutting, reduce processing costs, and improve Intrinsic Quality Effects

Active Publication Date: 2014-09-03
TANGSHAN DONGFANG HUASHENG GOOD WEAR RESISTING HIGH TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The disadvantages are: 1. Subsidy cutting is difficult, and the margin after cutting is large, resulting in an increase in the weight of the casting blank and an increase in processing costs
2. As the height of the casting increases, the subsidy becomes slender, the feeding channel becomes narrower, the sequential solidification weakens, and shrinkage defects are easily formed in the middle and lower parts of the subsidy, which cannot meet the flaw detection requirements

Method used

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  • Large cast steel long cylindrical piece feeding process method
  • Large cast steel long cylindrical piece feeding process method

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specific Embodiment approach

[0013] like figure 1 As shown, a large-scale cast steel long tube feeding process method is carried out as follows: the large-scale cast steel long tube 1 is cast, and is divided into two independent feeding zones in the axial direction, which are respectively the upper feeding zone and the lower feeding area, the upper feeding area adopts open riser 2 feeding, and the boundary of each adjacent independent feeding area is formed by cutting off the outer cold iron 8 to form a cold iron end area, which is self-feeding; The above-mentioned lower feeding area is fed by the side riser 9, and the outer chill iron 5 at the end of the lower feeding area shields the overheating effect of the bottom return pouring, so as to extend the feeding distance.

[0014] The design parameters of open riser 2 are:

[0015] Let the casting height be h and the outer diameter be d;

[0016] When h / d≥4, the open riser 2 is designed as an annular riser;

[0017] When h / d<4, the open riser 2 is desig...

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Abstract

The invention relates to the technical field of large cast steel pieces and in particular relates to a large cast steel long cylindrical piece feeding process method. The method comprises the following steps: casting a large cast steel long cylindrical piece, and dividing the piece into two independent feeding areas in the axial direction, namely an upper feeding area and a lower feeding area respectively; feeding the upper feeding area by adopting an open riser, forming a chilling block tail end area at the boundary of adjacent independent feeding areas through separated external chill, and performing automatic feeding; and feeding the lower feeding area through a kiss riser, shielding the overheat influence of bottom return casting through external chill at the tail end of the lower feeding area, and lengthening the feeding distance. According to the separated external chill and kiss riser, internal feeding is eliminated, the gas cutting workload is reduced, the weight of the rough casting is reduced, and the machining cost is reduced. Meanwhile, the inherent quality of the casting is improved, and the overall casting inspection reaches over level 2.

Description

technical field [0001] The invention relates to the technical field of large steel castings, in particular to a feeding process method for long steel castings. Background technique [0002] Large-scale cast steel long tube castings are common parts in the engineering field, machinery and equipment, such as various conveying pipes, inlet and outlet bushings, end covers, hollow shafts, etc. on ball mills. The traditional casting process of this type of casting is: vertical pouring, open top riser, internal subsidy, and partial use of external chilled iron to achieve sequential solidification and ensure the compactness of the casting. Its disadvantages are: 1. Subsidy cutting is difficult, and the margin after cutting is large, resulting in an increase in the weight of the casting blank and an increase in processing costs. 2. As the height of the casting increases, the subsidy becomes slender, the feeding channel becomes narrower, the sequential solidification weakens, and shr...

Claims

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Application Information

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IPC IPC(8): B22C9/24B22C9/08
Inventor 李淑君屠利明李铁
Owner TANGSHAN DONGFANG HUASHENG GOOD WEAR RESISTING HIGH TECH
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