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Method of centrifugal casting of steel pipes

A centrifugal casting and steel pipe technology, which is applied in the field of centrifugal casting steel pipes, can solve the problems of heavy skin cracks and shrinkage holes on the surface of steel pipes, and achieve the effects of reducing the impulse of molten steel, good quality and easy demoulding.

Active Publication Date: 2014-04-30
LINFEN PENGTAI WEIYE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the existing centrifugal casting method, when molten steel is poured from the sprue and falls on the inner wall of the pouring machine, due to the flow velocity and momentum of the molten steel, the pouring system and cavity will be eroded by the molten steel and the scattered sand particles that fall will float on the liquid surface Sand washing phenomenon is formed on the surface of the formed steel pipe, and a large number of sand holes are formed on the surface of the formed steel pipe; and because the molten steel is covered after cooling, heavy skin cracks will also be formed on the surface of the steel pipe; The flash generated at the end cap will cause mechanical resistance to the cooling and contraction of the steel pipe based on the solidification direction, making the pipe wall loose, and shrinkage cavities will appear when the looseness reaches a certain level

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The first step, preparatory work: add coating agent to the tube mold of the centrifugal casting machine, open the centrifugal casting machine so that the coating agent can evenly surround the inner wall of the centrifugal casting machine tube mold under centrifugal action, calculate and prepare The total amount of molten steel required for pouring steel pipes;

[0026] The second step, small flow pouring: inject molten steel from the pouring port of the centrifugal pouring machine, the pouring speed is controlled at 10 kg / s, and the pouring time is 5 s;

[0027] The third step is large-flow pouring: change the pouring speed so that it is controlled at 30 kg / s, and the pouring amount is 1 / 2 of the total amount of molten steel;

[0028] The fourth step, medium and small flow pouring: change the pouring speed so that it is controlled at 20 kg / s, and the pouring amount is all the remaining molten steel;

[0029] The fifth step, cooling and demoulding: the centrifugal pouri...

Embodiment 2

[0032] The first step, preparatory work: add coating agent to the tube mold of the centrifugal casting machine, open the centrifugal casting machine so that the coating agent can evenly surround the inner wall of the centrifugal casting machine tube mold under centrifugal action, calculate and prepare The total amount of molten steel required for pouring steel pipes;

[0033] The second step, small flow pouring: inject molten steel from the pouring port of the centrifugal pouring machine, the pouring speed is controlled at 12 kg / s, and the pouring time is 6 s;

[0034] The third step is large flow pouring: change the pouring speed so that it is controlled at 45 kg / s, and the pouring amount is 2 / 3 of the total amount of molten steel;

[0035] The fourth step, medium and small flow pouring: change the pouring speed so that it is controlled at 25 kg / s, and the pouring amount is all the remaining molten steel;

[0036] The fifth step, cooling and demoulding: the centrifugal pouri...

Embodiment 3

[0039] The first step, preparatory work: add coating agent to the tube mold of the centrifugal casting machine, open the centrifugal casting machine so that the coating agent can evenly surround the inner wall of the centrifugal casting machine tube mold under centrifugal action, calculate and prepare The total amount of molten steel required for pouring steel pipes;

[0040] The second step, small flow pouring: inject molten steel from the pouring port of the centrifugal pouring machine, the pouring speed is controlled at 15 kg / s, and the pouring time is 8 s;

[0041] The third step is large flow pouring: change the pouring speed so that it is controlled at 60 kg / s, and the pouring amount is 3 / 4 of the total amount of molten steel;

[0042] The fourth step, medium and small flow pouring: change the pouring speed so that it is controlled at 30 kg / s, and the pouring amount is all the remaining molten steel;

[0043] The fifth step, cooling and demoulding: the centrifugal pouri...

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PUM

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Abstract

The invention discloses a method of centrifugal casting of steel pipes and belongs to the technical field of centrifugal casting forming of steel pipes; the technical problem to be solved is to provide a method of centrifugal casting of steel pipes, and the method is capable of being used for casting steel pipes having high quality, free from sand holes on the surface, free from repeat skin flaw and shrinkage cavity, and having high percent of pass; the technical scheme is as follows: the method of centrifugal casting of steel pipes comprises the following steps: 1. preparing; 2. small flow pouring; 3. large flow pouring; 4. small and medium flow pouring; and 5. cooling and demolding; and the method disclosed by the invention is used for casting centrifugal of steel pipes, and the formed steel pipes have no repeat skin flaw on the surfaces, good quality, high percent of pass and high utilization rate of molten steel.

Description

technical field [0001] The invention discloses a method for centrifugal casting of steel pipes, which belongs to the technical field of centrifugal casting of steel pipes. Background technique [0002] As a kind of special casting, centrifugal casting is currently an industrial revolution in the foundry industry in terms of its development level. It is at the leading level in the world and is known as "green casting project". Two-color composite pipes are currently in great demand in the market. [0003] However, in the existing centrifugal casting method, when molten steel is poured from the sprue and falls on the inner wall of the pouring machine, due to the flow velocity and momentum of the molten steel, the pouring system and cavity will be eroded by the molten steel and the scattered sand particles that fall will float on the liquid surface Sand washing phenomenon is formed on the surface of the formed steel pipe, and a large number of sand holes are formed on the surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D13/12B22D13/02B22D13/00
Inventor 原晓张国安
Owner LINFEN PENGTAI WEIYE