Centrifugal cast tube die and manufacturing technique thereof

A technology of centrifugal casting pipe and manufacturing process, which is applied in the field of metallurgy, can solve problems such as scrapping, cracks on the inner wall of the pipe mold, and waste products, and achieve the effects of improving thermal fatigue resistance, improving service life, and extending service life

Active Publication Date: 2010-05-12
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pipe mold of the traditional cold molding method uses a single material 21CrMo10 pipe mold, and its fatigue failure mode is...

Method used

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  • Centrifugal cast tube die and manufacturing technique thereof
  • Centrifugal cast tube die and manufacturing technique thereof
  • Centrifugal cast tube die and manufacturing technique thereof

Examples

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Embodiment Construction

[0019] The invention discloses a structure and a manufacturing process of a cast pipe mold, so as to improve the service life of the pipe mold in centrifugal casting and reduce the probability of waste products produced by steel pipes in production.

[0020] Cast pipe mold structure among the present invention has following characteristics:

[0021] The casting pipe mold is made of metal material, and a heat-resistant mold steel composite layer is attached on the inner surface of the pipe wall of the casting pipe mold.

[0022] The heat-resistant die steel composite layer is made of 20CrMoWV material. The weight percentage of each alloy element in the heat-resistant die steel is C: 0.16-0.24; Si: 0.20-0.50; Mn: 0.30-0.60; P : ≤0.015; S≤0.012; Cr: 2.0~2.6; Mo: 0.40~1.0; W: 0.60~1.10; V: 0.03~0.06, the thickness of the composite layer is not less than 20 mm.

[0023] The outer tube wall is made of ordinary heat-resistant steel or low-alloy heat-resistant steel.

[0024] When t...

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Abstract

The invention discloses a centrifugal cast tube die and manufacturing technique thereof. The centrifugal cast tube die is made of metal material, and the alloy of the inner layer of the tube wall is a composite heat-resisting die steel layer. The matched technique method comprises: adopting centrifugal casting technique to finish shaping the outer layer of the tube wall of the centrifugal cast tube die by using the metal shaping cavity; when the outer layer metal of the tube wall of the centrifugal cast tube die cools to a temperature 20-100 DEG C lower than liquidus temperature, casting melt heat-resisting die steel on the inner surface for forming composite layer, and utilizing high speed rotation of the metal shaping cavity and the physical and chemical change between the metals of the inner layer and outer layer to realize centrifugal shaping of the composite tube blank; ejecting the tube after the alloy is completely solidified to form a blank of the composite cast tube die having complete metallurgy combination layer; trimming the inner surface and outer surface of the blank of the cast tube die and testing performance thereof, and carrying out periodical rolling and deforming by hot flaring technique to finally process into the cast tube die. For the cast tube die manufactured by the invention, heat and fatigue resisting performance is obviously improved, cracking on inner surface is remarkably delayed and service life is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of metallurgy, and more specifically relates to a centrifugal cast pipe mold and a manufacturing process thereof. Background technique [0002] At present, the centrifugal casting pipe technology of cold mold method has been very mature, coupled with its fast production rhythm and high efficiency, basically all medium and small size ductile graphite casting pipes adopt this technology. Among the molds used in the production of ductile iron pipes by centrifugal casting, the most important part is the pipe mold. Since the pipe mold is in direct contact with high temperature molten iron, the working conditions are quite harsh. Therefore, the life of the pipe die is relatively short. [0003] According to statistics, the life of a general pipe mold is only 6000-8000 pieces, that is, a pipe mold can be used about 6000-8000 times until it is damaged. Therefore, the cost of the pipe mold occupies a considerable ...

Claims

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Application Information

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IPC IPC(8): B22D13/10B32B15/01C22C38/24
Inventor 王黎晖崔新亮申勇陈建波庞于思宋亚峰陈睿
Owner XINXING DUCTILE IRON PIPES CO LTD
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