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Production process of special steel pipe for air-conditioning compressor casing

A technology for air-conditioning compressor and production process, applied in the field of production process of special steel pipe for air-conditioning compressor shell, can solve the problems of low production efficiency, large material consumption, large equipment investment, etc., achieve reliable welding quality, reduce steel strip deformation, The effect of extending the rolling line

Active Publication Date: 2010-11-17
无锡天龙钢管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the disadvantages of the above two production processes are that the material consumption is relatively large, the yield rate is low (generally 80% to 85%), the equipment investment is large, and because the products are all made in one piece, the production efficiency is low, resulting in product failure. high production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Product specifications: outer diameter Φ105mm, wall thickness 2.6mm

[0018] (1) Material selection and cutting into strips: select hot-rolled coils produced by Baosteel Group with materials of SPHC, elongation ≥ 31%, and tensile strength ≥ 270mpa, and use strip shears to separate the hot-rolled coils. The strips are cut into strips, and the blades of the strip shears need to be ground and repaired every time they are cut to ensure that the edges are sharp, so that the cutting edges are neat, and the burrs and curls on both sides of the strip strips are eliminated. On the other hand, the cut strip width is 3mm larger than the conventional strip width, that is, enlarged from the original 326.7mm to 328.7mm; the conventional strip width is calculated according to the formula: B=π(Φ-0.5S) (so Said formula is called " steel pipe " in the periodical, and publication date is March 29th, 2000, and ISSN number is 1001-2311, and the title is disclosed in the document ...

Embodiment 2

[0025] Example 2: Product specifications: outer diameter Φ126.85mm, wall thickness 3.2mm

[0026] (1) Material selection and cutting into strips: select hot-rolled coils produced by Baosteel Group with materials of SPHC, elongation ≥ 31%, and tensile strength ≥ 270mpa, and use strip shears to separate the hot-rolled coils. The strips are cut into strips, and the width of the cut strips is 3.5mm larger than that of conventional strips, that is, enlarged from the original 393.5mm to 397mm; the conventional strip width is based on the formula: B=π(Φ-0.5S ) is calculated;

[0027] (2) Feeding and tube forming: The cut strip steel is smoothly fed into the three-roll extrusion molding unit, and the center of the strip steel is consistent with the three-roll extrusion molding unit, so as not to twist the strip steel. To ensure the tightness of the welding seam; the three-roller extrusion molding unit rolls the steel strip 360° to form a rough tube, and the opening angle before extru...

Embodiment 3

[0033] Example 3: Product specifications: outer diameter Φ165mm, wall thickness 4mm

[0034] (1) Material selection and cutting into strips: select hot-rolled coils produced by Baosteel Group with SS400 material, tensile strength of 400-510mpa, and elongation ≥ 21%, and use strip shears to cut the hot-rolled coils The strips are cut into strips, and the cut strip width is 2.6mm larger than the conventional strip width, that is, enlarged from the original 512mm to 514.6mm; the conventional strip width is based on the formula: B=π(Φ- 0.5S) calculated;

[0035] (2) Feeding and tube forming: The cut strip steel is smoothly fed into the three-roll extrusion molding unit, and the center of the strip steel is consistent with the three-roll extrusion molding unit, so as not to distort the strip steel. To ensure the tightness of the welding seam; the three-roller extrusion forming unit rolls the steel strip 360° to form a rough tube, and the opening angle before extrusion on both side...

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Abstract

The invention relates to a production process of a special steel pipe for an air-conditioning compressor casing. The production process comprises the following steps of selecting materials, cutting into band steel, loading, forming rolled pipes, extruding into pipes through high-frequency welding, post-processing welding seams, detecting the welding seams, finishing, correcting and performing a hydraulic test according to the technical scheme provided by the invention. The production process optimizes the design of the width dimension of the band steel and the size of an opening angle and improves the precision of the final product; current, voltage and rolling speed are rationally adjusted according to the size of the steel pipe and the sheet thickness, thus ensuring reliable welding quality; and a compressor unit is carefully combined, a rolling line is lengthened and deformation of steel bands among each unit is reduced so as to ensure welding quality of the steel pipe and control rebounding of the steel pipe.

Description

technical field [0001] The invention relates to a production process of a steel pipe, in particular to a production process of a special steel pipe for an air conditioner compressor shell. Background technique [0002] Air-conditioning compressor casings have very high quality requirements. Generally speaking, the roundness of steel pipes is required to be ≤0.25mm, and the tolerance of welding slag burrs on the inner wall of the pipe is required to be ≤+0.00 / -0.15 after removal. At the same time, it must be able to withstand high Pressure (working pressure: 5mpa, test pressure: 15mpa). At present, the steel pipe shells of air-conditioning compressors at home and abroad generally adopt the "one-piece deep drawing forming process" in Japan or the "single-piece bending plasma welding forming process" in the United States. Both of these two production processes can ensure that the air-conditioning compressor shell meets the requirements. The accuracy index and pressure index ha...

Claims

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Application Information

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IPC IPC(8): B23P15/00
Inventor 许继荫
Owner 无锡天龙钢管有限公司
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