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Heating method for preventing oxidization of inner surface of blind hole blank

A heating method and anti-oxidation technology, applied in the field of thermal processing, can solve the problems of large surface temperature drop, inability to meet the extrusion of deep blind holes, long time for inner hole oxide skin, etc., and achieve the effect of slowing down oxidation.

Inactive Publication Date: 2019-06-28
INNER MONGOLIA NORTH HEAVY INDS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for large-sized blind hole blanks, it takes a long time to remove the oxide scale in the inner hole and the surface temperature drops greatly in the hot state. The existing conditions cannot meet the requirements of deep blind hole extrusion.

Method used

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  • Heating method for preventing oxidization of inner surface of blind hole blank

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Embodiment 1

[0026] Anti-oxidation heating is performed on the inner surface of the blind hole blank 5 with a specification of Φ930×360×1200 (outer diameter×inner diameter×blank height, blind hole depth 960mm).

[0027] 1. The smelting and casting material is WB36, a 7-ton refined steel ingot, which is prepared into a blind hole billet of Φ930×360×1200, and the inner surface of the blind hole is processed to expose the visible metallic luster;

[0028] 2. Preparation of anti-oxidation mixture;

[0029] The inner surface area of ​​the blind hole is about 1.2m 2 , equipped with carbon powder and molybdenum disulfide mixture 2.5kg (mass ratio of carbon powder and molybdenum disulfide 1:2 ~ 1:1).

[0030] 3. At room temperature, evenly brush the anti-oxidation mixture on the inner surface of the blind hole of the billet, and the thickness of the anti-oxidation coating is about 1.5mm;

[0031] 4. Place a thick steel plate 2 of 2000mm×2000mm×50mm (length×width×thickness) horizontally at the bo...

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Abstract

The invention discloses a heating method for preventing oxidization of the inner surface of a blind hole blank. The method comprises the steps that an anti-oxidation mixture is painted to the blind hole inner surface of the blind hole blank, the blind hole blank is placed into a heating furnace, and carbon powder is placed on a steel plate of the lower portion of a blind hole; the blind hole covers coke powder; in the blind hole blank heating process of the heating furnace, the anti-oxidation mixture and the air form anti-oxidation atmosphere in the blind hole, and the inner surface of the blind hole is prevented from forming oxide skin influencing extrusion forming. The heating method can reduce blind hole inner surface oxidization of the blind hole blank, and formation of the oxide skinis prevented.

Description

technical field [0001] The invention relates to a thermal processing technology, in particular to a heating method for anti-oxidation of the inner surface of a blind hole blank. Background technique [0002] With the successful commissioning of large-scale extrusion machines in my country, the previous method of preparing large-scale deep blind-hole blanks by nesting forged bars along the axis has been changed, and the method of using blind-hole blanks to directly extrude large-scale deep blind-hole products has been changed. [0003] In general, from the perspective of economy, use a natural gas heating furnace to heat the billet—remove the surface scale—spray glass lubricant, and place it in the extrusion station for extrusion. However, for large-sized blind-hole blanks, it takes a long time to remove the inner hole scale in the hot state and the surface temperature drops greatly. The existing conditions cannot meet the requirements of deep blind-hole extrusion. Contents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C29/00
Inventor 刘海江胡永平苗良厚周仲成陈建平秦瑞廷白箴
Owner INNER MONGOLIA NORTH HEAVY INDS GROUP