CN101885136A - Production process of special steel pipe for air-conditioning compressor casing - Google Patents
Production process of special steel pipe for air-conditioning compressor casing Download PDFInfo
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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
The present invention relates to a kind of production technology of steel pipe, specifically is a kind of production process of special steel pipe for air-conditioning compressor casing.
Background technology
The air-conditioner compressor outer housing cylindrical shell has very high quality requirement, in general, steel pipe roundness requirement≤0.25mm, inside pipe wall welding slag burr after removing tolerance≤+ 0.00/-0.15. simultaneously must be able to bear higher pressure (operating pressure 5mpa, test pressure: 15mpa).At present, produce compressor of air conditioner steel pipe shell both at home and abroad and generally adopt " the single-piece deep-draw moulding process " of Japan or " the crooked plasma welding fabrication of the single-piece technology " of the U.S., these two kinds of production technologies can guarantee that all air-conditioner compressor outer housing reaches desired precision index and pressure-bearing index, are extensively adopted by domestic and international compressor of air conditioner manufacturing enterprise.
It is bigger that but the weak point of two kinds of above-mentioned production technologies is that material expends, yield rate low (generally 80%～85%), and equipment investment is big, and because product all is the single-piece making, production efficiency is low, causes production cost of products very high.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of operating procedure easy production process of special steel pipe for air-conditioning compressor casing, this production technology can be under the prerequisite of guaranteeing product precision index and pressure-bearing index, effectively enhance productivity and yield rate, save raw material and equipment investment, reduce production costs significantly.
According to technical scheme provided by the invention, described production process of special steel pipe for air-conditioning compressor casing comprises the steps:
(1), selection and be cut into the band steel: select hot-rolled coil for use, utilize band steel cutter that the hot-rolled coil itemize is cut into the band steel, the strip width that shears is than the conventional big 3mm～3.5mm of strip width size, described conventional strip width is according to formula: (Φ-0.5S) calculates and obtains B=π, wherein, B is a strip width, and Φ is the product external diameter, and S is a hot-rolled coil thickness;
(2), material loading and tube rolling moulding: the band steel that will shear is steadily sent in the three-roller type extrusion modling unit, and the center of band steel and three-roller type extrusion modling unit is consistent; Three-roller type extrusion modling unit will be with coil of strip to roll 360 ° and form the blank socket, and the angular aperture before the extruding of both sides is controlled between 2.5 °～3.5 °;
(3), high-frequency welding is squeezed into pipe: adopt solid-state high-frequency welding equipment that volume is rolled good blank socket and weld, weldingvoltage is: 220V～350V, electric current is: 130A～370A, mill speed is: 20～35 meters/minute;
(4), weld seam post processing: adopt the circular arc cutter to strike off the welding slag (burr) of outside, commissure and inwall, when being in 850 °～950 ° high-temperature regions in the weld metal zone, butt welded seam carries out roll extrusion;
(5), weld seam detection: adopt the water-cooling pattern cooling through the steel pipe of post processing, cooled steel pipe enters eddy current flaw detec, and butt welded seam carries out the random groups test of flaw detection, pipe cutting at any time aborning simultaneously, butt welded seam flattens test;
(6), finishing is proofreaied and correct: the correction unit that the qualified steel pipe of detection weld seam welding enters Runout area carries out accuracy correction, guarantees roundness≤+/-0.15 of steel pipe;
(7), the water pressure test: to the steel pipe of proofreading and correct through weld seam detection and the finishing water pressure test of exerting pressure, guarantee that this steel pipe can bear the high pressure of 15mpa, duration 〉=1 minute, product reaches qualified index; The steel pipe of pass the test is packaging and warehousing after tack, chamfering and immersion oil are handled.
As a further improvement on the present invention, to select material for use be that hot-rolled coil or the material of SPHC, percentage elongation 〉=31%, tensile strength 〉=270mpa is that SS400, tensile strength are the hot-rolled coil of 400～510mpa, percentage elongation 〉=21% to described hot-rolled coil.
As a further improvement on the present invention, described correction unit comprises that four groups are slightly proofreaied and correct unit and three groups of fine correction units.
The present invention compared with prior art, advantage is: optimized strip width size and angular aperture size design, improved the final products precision; Rationally adjust electric current, voltage and mill speed according to steel pipe size and thickness of slab, guarantee reliable welding quality; Unit is carried out elaborate combination, prolong roll line, dwindle the strip deformation amount between every group, guarantee the quality and the bounce-back of having controlled steel pipe of steel pipe welding.
The specific embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1: product specification: external diameter Φ 105mm, wall thickness 2.6mm
(1), selection and be cut into the band steel: the material of selecting for use Baoshan Iron and Steel Group to produce is the hot-rolled coil of SPHC, percentage elongation 〉=31%, tensile strength 〉=270mpa, utilize band steel cutter that the hot-rolled coil itemize is cut into the band steel, the every shearing of blade of described band steel cutter once, need carry out the cutting edge mill repaiies, the assurance cutting edge is sharp, thereby make the mouth of cutting edge neat, eliminate the burr and the crimping that divide band steel both sides, the strip width that shears promptly is amplified to 328.7mm by original 326.7mm than the big 3mm of conventional strip width; Described conventional strip width is according to formula: (Φ-0.5S) calculates and obtains that (described formula is at periodical " steel pipe " by name B=π, publication date is on March 29th, 2000, ISSN number is 1001-2311, and title is open in the document of " ERW required strip width computing formula inquire into ".), wherein, B is a strip width, and Φ is the product external diameter, and S is a hot-rolled coil thickness;
(2), material loading and tube rolling moulding: the band steel that will shear is steadily sent in the three-roller type extrusion modling unit, and the center of band steel and three-roller type extrusion modling unit is consistent, and does not make the distortion of band steel, and is closely to guarantee weld seam; Three-roller type extrusion modling unit will be with coil of strip to roll 360 ° and form the blank socket, and the angular aperture before the extruding of both sides is controlled between 2.5 °～3 °;
(3), high-frequency welding is squeezed into pipe: adopt solid-state high-frequency welding equipment that volume is rolled good blank socket and weld, weldingvoltage is 230V, and electric current is 150～170A, and mill speed is 30 meters/minute.Adopt solid-state high-frequency welding equipment replacement electron tube high-frequency welding equipment in the past among the present invention, solid-state high-frequency welding equipment can be controlled automatically, make current stabilization, eliminate voltage pulsation, welding temperature is steady thereupon, makes strip edge edge temperature even, guaranteed the quality of soldered, according to the size of thickness of slab and specification, electric current and voltage is controlled adjustment, and mill speed is conveniently adjusted simultaneously;
(4), weld seam post processing: adopt the circular arc cutter to strike off the welding slag (burr) of the outside and inwall in commissure, when being in 850 °～950 ° high-temperature region in the weld metal zone, butt welded seam carries out roll extrusion, and is tight and make the soldered smooth surface to impel the soldered structure.
(5), weld seam detection: the steel pipe through post processing adopts the water-cooling pattern cooling, and cooled steel pipe enters eddy current flaw detec, and butt welded seam carries out the random groups test of flaw detection, determines that after testing weld seam is intact; Pipe cutting carries out＞180 ° flattening test to the internal bore welding seam simultaneously, determines that after testing weld seam does not have cracking and flawless; Internal bore welding slag sampling (burr) is measured, height in the accuracy rating of+0.00/-0.15, when interior burr is scraped after, weld seam does not have tangible wave phenomenon, steel pipe meets every quality testing requirement.
(6), finishing proofreaies and correct: detect the correction unit that qualified steel pipe enters Runout area and carry out accuracy correction, described correction unit slightly proofreaies and correct unit by four groups and three groups of fine correction units are formed, and the roundness after steel pipe is calibrated≤+/-0.15 meets the requirements.
(7), the water pressure test: to the water pressure test of exerting pressure through the steel pipe of weld seam detection and finishing correction, steel pipe kept 〉=1 minute under bearing above the high pressure of 15mpa, product reaches qualified index, and steel pipe is packaging and warehousing after tack, chamfering and immersion oil are handled then.
Embodiment 2: product specification: external diameter Φ 126.85mm, wall thickness 3.2mm
(1), selection and be cut into the band steel: the material of selecting for use Baoshan Iron and Steel Group to produce is the hot-rolled coil of SPHC, percentage elongation 〉=31%, tensile strength 〉=270mpa, utilize band steel cutter that the hot-rolled coil itemize is cut into the band steel, the strip width that shears promptly is amplified to 397mm by original 393.5mm than the big 3.5mm of conventional strip width; Described conventional strip width is according to formula: (Φ-0.5S) calculates and obtains B=π;
(2), material loading and tube rolling moulding: the band steel that will shear is steadily sent in the three-roller type extrusion modling unit, and the center of band steel and three-roller type extrusion modling unit is consistent, and does not make the distortion of band steel, and is closely to guarantee weld seam; Three-roller type extrusion modling unit will be with coil of strip to roll 360 ° and form the blank socket, and the angular aperture before the extruding of both sides is controlled between 2.7 °～3.2 °;
(3), high-frequency welding is squeezed into pipe: adopt solid-state high-frequency welding equipment that volume is rolled good blank socket and weld, weldingvoltage is 270V, and electric current is 190～210A, and mill speed is 27 meters/minute.
(4), weld seam post processing: adopt the circular arc cutter to strike off the welding slag (burr) of the outside and inwall in commissure, when being in 850 °～950 ° high-temperature region in the weld metal zone, butt welded seam carries out roll extrusion, and is tight and make the soldered smooth surface to impel the soldered structure.
(5), weld seam detection: the steel pipe through post processing adopts the water-cooling pattern cooling, and cooled steel pipe enters eddy current flaw detec, and butt welded seam carries out the random groups test of flaw detection, determines that after testing weld seam is intact; Pipe cutting carries out＞180 ° flattening test to the internal bore welding seam simultaneously, determines the steel pipe flawless after testing; Internal bore welding slag (burr) is measured, its height in the accuracy rating of+0.00/-0.15, when interior burr is scraped after, weld seam does not have tangible wave phenomenon, steel pipe meets every detection requirement;
(6), finishing proofreaies and correct: detect the correction unit that qualified steel pipe enters Runout area and carry out accuracy correction, described correction unit slightly proofreaies and correct unit by four groups and three groups of fine correction units are formed, and the roundness after steel pipe is calibrated≤+/-0.15 meets the requirements;
(7), the water pressure test: to the water pressure test of exerting pressure through the steel pipe of weld seam detection and finishing correction, steel pipe continues 1 minute under bearing above the high pressure of 15mpa, and product reaches qualified index, and steel pipe is packaging and warehousing after tack, chamfering and immersion oil are handled then.
Embodiment 3: product specification: external diameter Φ 165mm, wall thickness 4mm
(1), selection and be cut into the band steel: the material of selecting for use Baoshan Iron and Steel Group to produce is that SS400, tensile strength are the hot-rolled coil of 400～510mpa, percentage elongation 〉=21%, utilize band steel cutter that the hot-rolled coil itemize is cut into the band steel, the strip width that shears promptly is amplified to 514.6mm by original 512mm than the big 2.6mm of conventional strip width; Described conventional strip width is according to formula: (Φ-0.5S) calculates and obtains B=π;
(2), material loading and tube rolling moulding: the band steel that will shear is steadily sent in the three-roller type extrusion modling unit, and the center of band steel and three-roller type extrusion modling unit is consistent, and does not make the distortion of band steel, and is closely to guarantee weld seam; Three-roller type extrusion modling unit will be with coil of strip to roll 360 ° and form the blank socket, and the angular aperture before the extruding of both sides is controlled between 3.2 °～3.5 °;
(3), high-frequency welding is squeezed into pipe: adopt solid-state high-frequency welding equipment that volume is rolled good blank socket and weld, weldingvoltage is 300V, and electric current is 320～330A, and mill speed is 24 meters/minute;
(4), weld seam post processing: adopt the circular arc cutter to strike off the welding slag (burr) of the outside and inwall in commissure, when being in 850 °～950 ° high-temperature region in the weld metal zone, butt welded seam carries out roll extrusion, and is tight and make the soldered smooth surface to impel the soldered structure.
(5), weld seam detection: the steel pipe through post processing adopts the water-cooling pattern cooling, and cooled steel pipe enters eddy current flaw detec, and butt welded seam carries out the random groups test of flaw detection, determines that after testing weld seam is intact; Pipe cutting carries out＞180 ° flattening test to the internal bore welding seam simultaneously, determines the steel pipe flawless after testing; Internal bore welding slag (burr) is measured, its height in the accuracy rating of+0.00/-0.15, when interior burr is scraped after, weld seam does not have tangible wave phenomenon, steel pipe meets every detection requirement;
(6), finishing proofreaies and correct: detect the correction unit that qualified steel pipe enters Runout area and carry out accuracy correction, described correction unit slightly proofreaies and correct unit by four groups and three groups of fine correction units are formed, and the roundness after steel pipe is calibrated≤+/-0.15 meets the requirements;
(7), the water pressure test: to the water pressure test of exerting pressure through the steel pipe of weld seam detection and finishing correction, steel pipe is normal fully under bearing above the high pressure of 15mpa, and product reaches qualified index, and steel pipe is packaging and warehousing after tack, chamfering and immersion oil are handled then.
Claims (3)
1. production process of special steel pipe for air-conditioning compressor casing is characterized in that comprising the steps:
(1), selection and be cut into the band steel: select hot-rolled coil for use, utilize band steel cutter that the hot-rolled coil itemize is cut into the band steel, the strip width that shears is than the conventional big 2.5mm～3.5mm of strip width size, described conventional strip width is according to formula: (Φ-0.5S) calculates and obtains B=π, wherein, B is a strip width, and Φ is the product external diameter, and S is a hot-rolled coil thickness;
(2), material loading and tube rolling moulding: the band steel that will shear is steadily sent in the three-roller type extrusion modling unit, and the center of band steel and three-roller type extrusion modling unit is consistent; Three-roller type extrusion modling unit will be with coil of strip to roll 360 ° and form the blank socket, and the angular aperture before the extruding of both sides is controlled between 2.5 °～3.5 °;
(3), high-frequency welding is squeezed into pipe: adopt solid-state high-frequency welding equipment that volume is rolled good blank socket and weld, weldingvoltage is 220V～350V, and electric current is 130A～370A, and mill speed is 20 meters～35 meters/minute;
(4), weld seam post processing: employing circular arc cutter strikes off the welding slag of outside, commissure and inwall, and when being in 850 °～950 ° high-temperature region in the weld metal zone, butt welded seam carries out roll extrusion;
(5), weld seam detection: through the steel pipe cooling of post processing, cooled steel pipe enters eddy current flaw detec, and butt welded seam carries out the random groups test of flaw detection, and the while is pipe cutting sampling at any time aborning, and butt welded seam flattens test;
(6), finishing proofreaies and correct: detect the correction unit that qualified steel pipe enters Runout area and carry out accuracy correction, guarantee roundness≤+/-0.15 of steel pipe;
(7), the water pressure test: to the water pressure test of exerting pressure through the steel pipe of weld seam detection and finishing correction, guarantee that this steel pipe can bear the high pressure of 15mpa, continue 1 minute product and reach qualified index; The steel pipe of pass the test is packaging and warehousing after tack, chamfering and immersion oil are handled.
2. production process of special steel pipe for air-conditioning compressor casing as claimed in claim 1 is characterized in that: it is that hot-rolled coil or the material of SPHC, percentage elongation 〉=31%, tensile strength 〉=270mpa is that SS400, tensile strength are the hot-rolled coil of 400～510mpa, percentage elongation 〉=21% that described hot-rolled coil is selected material for use.
3. production process of special steel pipe for air-conditioning compressor casing as claimed in claim 1 is characterized in that: described correction unit comprises that four groups are slightly proofreaied and correct unit and three groups of fine correction units.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672432A (en) * | 2012-05-17 | 2012-09-19 | 无锡天龙钢管有限公司 | Production process for steel tubes special for shell of vortex type air-conditioning compressor |
| CN102678569A (en) * | 2012-05-17 | 2012-09-19 | 无锡天龙钢管有限公司 | Special steel pipe for shell body of vortex-type air-conditioning compressor |
| CN103470873A (en) * | 2013-09-18 | 2013-12-25 | 无锡天龙钢管有限公司 | Special steel pipe for CO2 (carbon dioxide) air conditioner compressor casing and processing process of special steel pipe |
| CN103506821A (en) * | 2012-06-28 | 2014-01-15 | 浙江兆隆合金股份有限公司 | Production method of low-stress copper steel compound welded pipe |
| CN103692170A (en) * | 2013-12-30 | 2014-04-02 | 浙江双飞无油轴承股份有限公司 | Method for manufacturing composite shaft sleeve with two tapered ends |
| CN105364427A (en) * | 2015-12-17 | 2016-03-02 | 江苏省常熟环通实业有限公司 | Preparation method of straight-seam high-frequency welded tube |
| CN105397427A (en) * | 2015-12-17 | 2016-03-16 | 江苏省常熟环通实业有限公司 | Production method for corrosion-resisting aluminum alloy high-frequency welded tube |
| CN105583587A (en) * | 2016-03-25 | 2016-05-18 | 大连新锋钢管厂 | Fastening hoop welding technology |
| CN106191649A (en) * | 2016-07-26 | 2016-12-07 | 张家港市华尊宝特种材料科技有限公司 | A kind of air bag system low-alloy high-strength welded still pipe and manufacture method thereof |
| CN107186441A (en) * | 2017-06-01 | 2017-09-22 | 东莞市金瑞五金股份有限公司 | A kind of preparation technology of compressor case |
| CN110102962A (en) * | 2019-04-08 | 2019-08-09 | 珠海华宇机械制造有限公司 | A kind of air-conditioning compressor cylinder inner cavity and outer surface processing technology |
| CN110142310A (en) * | 2019-05-31 | 2019-08-20 | 常熟市盈博钢管有限公司 | A kind of production technology of steel pipes with straight |
| CN113695841A (en) * | 2021-07-08 | 2021-11-26 | 江苏武进不锈股份有限公司 | Method for manufacturing composite welding austenitic stainless steel pipe for fluid transportation |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672432A (en) * | 2012-05-17 | 2012-09-19 | 无锡天龙钢管有限公司 | Production process for steel tubes special for shell of vortex type air-conditioning compressor |
| CN102678569A (en) * | 2012-05-17 | 2012-09-19 | 无锡天龙钢管有限公司 | Special steel pipe for shell body of vortex-type air-conditioning compressor |
| CN103506821A (en) * | 2012-06-28 | 2014-01-15 | 浙江兆隆合金股份有限公司 | Production method of low-stress copper steel compound welded pipe |
| CN103470873A (en) * | 2013-09-18 | 2013-12-25 | 无锡天龙钢管有限公司 | Special steel pipe for CO2 (carbon dioxide) air conditioner compressor casing and processing process of special steel pipe |
| CN103692170A (en) * | 2013-12-30 | 2014-04-02 | 浙江双飞无油轴承股份有限公司 | Method for manufacturing composite shaft sleeve with two tapered ends |
| CN105397427A (en) * | 2015-12-17 | 2016-03-16 | 江苏省常熟环通实业有限公司 | Production method for corrosion-resisting aluminum alloy high-frequency welded tube |
| CN105364427A (en) * | 2015-12-17 | 2016-03-02 | 江苏省常熟环通实业有限公司 | Preparation method of straight-seam high-frequency welded tube |
| CN105583587A (en) * | 2016-03-25 | 2016-05-18 | 大连新锋钢管厂 | Fastening hoop welding technology |
| CN106191649A (en) * | 2016-07-26 | 2016-12-07 | 张家港市华尊宝特种材料科技有限公司 | A kind of air bag system low-alloy high-strength welded still pipe and manufacture method thereof |
| CN107186441A (en) * | 2017-06-01 | 2017-09-22 | 东莞市金瑞五金股份有限公司 | A kind of preparation technology of compressor case |
| CN110102962A (en) * | 2019-04-08 | 2019-08-09 | 珠海华宇机械制造有限公司 | A kind of air-conditioning compressor cylinder inner cavity and outer surface processing technology |
| CN110142310A (en) * | 2019-05-31 | 2019-08-20 | 常熟市盈博钢管有限公司 | A kind of production technology of steel pipes with straight |
| CN113695841A (en) * | 2021-07-08 | 2021-11-26 | 江苏武进不锈股份有限公司 | Method for manufacturing composite welding austenitic stainless steel pipe for fluid transportation |
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