CN102319732A - Vacuum milling method for metal compound plate - Google Patents
Vacuum milling method for metal compound plate Download PDFInfo
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- CN102319732A CN102319732A CN201110270155A CN201110270155A CN102319732A CN 102319732 A CN102319732 A CN 102319732A CN 201110270155 A CN201110270155 A CN 201110270155A CN 201110270155 A CN201110270155 A CN 201110270155A CN 102319732 A CN102319732 A CN 102319732A
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Abstract
The invention provides a vacuum milling method for a metal compound plate, which relates to a compound plate production method and comprises the following steps that: 1, circumference lead angle beveled edges are processed on the circumference of the single side of a base plate, and the circumference dimension of a stainless steel plate is smaller than the dimension of the circumference lead angle beveled edges; 2, a right-angle hole is drilled between the lead angle beveled edges; 3, the stainless steel plate is flatly paved on the lead angle beveled edges side of the base plate, in addition, a soldering flux layer is flatly paved between the stainless steel plate and the base plate, and the circumference sealing welding is carried out on a pressure platform; 4, the vacuum pumping is carried out through the right-angle hole of the base plate, and the sealing and plugging is carried out after the vacuum pumping; 5, the two prepositive blank stainless steel surfaces are combined, in addition, a high-temperature adhesion-prevention agent layer is flatly paved between the two prepositive blank stainless steel surfaces, then, separation plates with the same circumference lengths are in dot welding on the circumference, and next, submerged arc welding sealing welding is carried out between the two lead angle beveled edges and the separation plates; 6, a plurality of vent holes are drilled on a sealing and welding ring frame and the separation plates, 7, the hot milling is carried out; and 8, the edge milling separation is carried out. The vacuum milling method has the advantages that the prepositive blank processing and the vacuum pumping are firstly carried out, then, air holes are drilled, excessive air can be exhausted during the milling, and the plate material quality is ensured.
Description
Technical field:
The present invention relates to the vacuum rolling method of composite plate production method, particularly composite metal plate.
Background technology:
Composite metal plate refers to that different metal is combined into template, is meant that generally corrosion resistant plate is as compound as basal plate of coating steel plate and ordinary carbon steel.
Pressure vessel had both required inwall stainless, required to have certain wall thickness again, used all steel plate cost of manufacture high, had therefore proposed to use the requirement of stainless steel clad plate.Chinese patent 200510033870 " adopts compound base to produce the method for brazing hot rolled metal composite plate " and discloses a kind of technical scheme.This scheme is after two plied timber plates, two parent metal plates are stacked earlier; At the welded demarcation strip, implement the sealing welding of ring limit again, the back is boring and welding vacuum tube on peripheral soldering and sealing circle frame; Compound base is heated in the time of 400-450 ° and vacuumizes, and packing is implemented hot rolling behind the aperture.The weak point that this production technology exists is: vacuumize temperature requirement 400-450 °, and not only consuming time but also consume energy in the heating process.Vacuumize and can not produce absolute vacuum, still possess the minute quantity air between plate, air can expand under hot-rolled state, and the air between two composite beds expands and can't run out so, and reason is that the surrounding has all sealed.This moment, air expanded, and can arrange antitack agent, destroyed the uniformity of antitack agent, thereby pit then occurred for a short time, the situation of composite bed bubbling then occurs greatly, or bonding point occurred.After treating that two composite layered plates separately, bubbling then forms depression, and the composite bed air spots is sliding, and composite bed thickness produces inhomogeneous point, influences board quality, outward appearance, does not meet the strict standard of pressure vessel with material.
Summary of the invention:
The objective of the invention is to overcome above-mentioned weak point, a kind of vacuum rolling method of composite metal plate is provided.
Scheme of the present invention is: the steps include:
1. with pressure vessel with plate as substrate, all lead angle grooves of processing ring around the substrate single face, the corrosion resistant plate peripheral size is less than all lead angle groove sizes of ring;
2. boring: between the adjacent two sides of the lead angle groove of substrate, drill through hole, a right angle, as vacuumizing the hole;
3. preposition butt welding: corrosion resistant plate is tiled on this one side of substrate lead angle groove, and between tiling soldering flux layer, then on pressure platform, the corrosion resistant plate periphery encircles all seal weld with the baseplate-laminating place and connects the preposition base material of formation;
4. vacuumize: vacuumize through hole, substrate right angle, take out right angle, back port closing;
5. close base soldering and sealing: two preposition base material surface stainless steels are involutory; And the high temperature antitack agent layer that tiles between the two; Then at the demarcation strip of two corrosion resistant plate surrounding spot welding isoperimetric length of sides; Implement submerged-arc welding soldering and sealing in trapezoid cross section, the four limits cavity that between two lead angle grooves, demarcation strip, forms again, form composite plate blanks;
6. boring: symmetry drills through several air-vents on soldering and sealing circle frame and demarcation strip;
7. hot rolling: composite plate blanks is preheated between 1000 °-1300 °, get into the hot mill rolling moulding;
8. cut edge and separate finishing completion product sheet material.
The invention has the advantages that: the preposition base material of going ahead of the rest is processed, is vacuumized, and then composite plate blanks forms and just can drill through pore, and residual air just can be run out of when rolling, thereby has guaranteed board quality; Normal temperature vacuumizes, energy-conservation joint consumption.
Description of drawings:
Accompanying drawing is a structural representation of the present invention.
The specific embodiment:
The present invention is characterized in that; The steps include:
1. with pressure vessel with plate as substrate 2, all lead angle grooves of processing ring around substrate 2 single faces, corrosion resistant plate 1 peripheral size is less than all lead angle groove sizes of ring;
2. boring: between the adjacent two sides of the lead angle groove of substrate 2, drill through hole, a right angle, as vacuumizing the hole;
3. preposition butt welding: corrosion resistant plate 1 is tiled on this one side of substrate 2 lead angle grooves, and between tiling soldering flux layer 3, then on pressure platform, corrosion resistant plate 1 periphery encircles all seal weld with substrate 2 joint places and connects the preposition base material of formation;
4. vacuumize: vacuumize through hole, substrate 2 right angle, take out right angle, back port closing;
5. close base soldering and sealing: two preposition base material surface stainless steels are involutory; And 4 layers of the high temperature antitack agents of tiling between the two; Then at the demarcation strip 5 of two corrosion resistant plates, the 1 surrounding spot welding isoperimetric length of side; Implement submerged-arc welding soldering and sealing in trapezoid cross section, the four limits cavity that between two lead angle grooves, demarcation strip 5, forms again, form composite plate blanks;
6. boring: symmetry drills through several air-vents 7 on soldering and sealing circle frame 6 and demarcation strip 5;
7. hot rolling: composite plate blanks is preheated between 1000 °-1300 °, get into the hot mill rolling moulding;
8. cut edge and separate finishing completion product sheet material.
Owing to there is not absolute vacuum, especially vacuumize and be not in a container or a little volume, to vacuumize, vacuumize but put up between the plywood material slit, so vacuum is difficult to up to standard fully two.And at course of hot rolling, the high temperature of degree more than 1,000 will make the residual air rapid expanding, between two surface stainless steels, if residual air can't be run out, then push antitack agent 4, make it inhomogeneous, form depression or bubbling or bonding point in rolling back.And both are powerful separately the time, and defective just exposes out.Has residual air too between certain preposition base material, but do not exist both to separate, and interior shop is soldering flux that its requirement, effect are different fully with antitack agent 4, do not influence product quality.
Above-mentioned employing composite plate blanks produce brazing hot rolled pressure vessel use in the method for stainless steel clad plate basic unit and coating steel plate as industry standard NB/T_47002.1-2009 pressure vessel with explosive welding composite plate first: the stainless steel of 7.1 cover materials and base material defined and pressure-volume plate in stainless steel-steel composite board.
Above-mentioned employing composite plate blanks production vacuum rolling pressure vessel uses the 3. middle soldering flux of the method step of stainless steel clad plate for the pool material, can adopt the spot welding mode to lay.
Above-mentioned employing composite plate blanks produce method step that brazing hot rolled pressure vessel uses stainless steel clad plate 3. in the condition of vacuumizing be: normal temperature pressurize half an hour, vacuum is lower than atmospheric pressure.
Above-mentioned employing composite plate blanks is produced brazing hot rolled pressure vessel can adopt anti-1350 ℃ of high purity metal oxidation superfine powders with the 4. middle high temperature antitack agent 4 of the method step of stainless steel clad plate.
It is that the pressure vessel of 8mm-50mm, wide 1200mm-3000mm is used stainless steel clad plate that the difference that adopts method of the present invention to look mill rolling force, rolling width can be produced thickness usually.According to above-mentioned manufacturing approach and principle, composite plate is can single face compound also can be two-sided compound or multiaspect is compound.
Claims (1)
1. the vacuum rolling method of composite metal plate is characterized in that; The steps include:
1. with pressure vessel with plate as substrate (2), all lead angle grooves of processing ring around substrate (2) single face, corrosion resistant plate (1) peripheral size is less than all lead angle groove sizes of ring;
2. boring: between the adjacent two sides of the lead angle groove of substrate (2), drill through hole, a right angle, as vacuumizing the hole;
3. preposition butt welding: corrosion resistant plate (1) is tiled on this one side of substrate (2) lead angle groove, and between tiling soldering flux layer (3), then on pressure platform, corrosion resistant plate (1) periphery encircles all seal weld with substrate (2) joint place and connects the preposition base material of formation;
4. vacuumize: vacuumize through substrate (2) hole, right angle, take out right angle, back port closing;
5. close base soldering and sealing: two preposition base material surface stainless steels are involutory; And high temperature antitack agent (4) layer that tiles between the two; Then at the demarcation strip (5) of two corrosion resistant plates (1) surrounding spot welding isoperimetric length of side; Implement submerged-arc welding soldering and sealing in trapezoid cross section, the four limits cavity that between two lead angle grooves, demarcation strip (5), forms again, form composite plate blanks;
6. boring: drill through several air-vents (7) at soldering and sealing circle frame (6) and the last symmetry of demarcation strip (5);
7. hot rolling: composite plate blanks is preheated between 1000 °-1300 °, get into the hot mill rolling moulding;
8. cut edge and separate finishing completion product sheet material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110270155A CN102319732A (en) | 2011-09-07 | 2011-09-07 | Vacuum milling method for metal compound plate |
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| CN201110270155A CN102319732A (en) | 2011-09-07 | 2011-09-07 | Vacuum milling method for metal compound plate |
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| CN102319732A true CN102319732A (en) | 2012-01-18 |
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| CN201110270155A Pending CN102319732A (en) | 2011-09-07 | 2011-09-07 | Vacuum milling method for metal compound plate |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581573A (en) * | 2012-03-19 | 2012-07-18 | 沈阳航新金属复合科技有限公司 | Method for hot-rolling and preparing composite plates by means of hot spraying preset brazing filler materials |
| CN102764960A (en) * | 2012-07-27 | 2012-11-07 | 济钢集团有限公司 | Method for manufacturing composite steel plate for hydrogenation reaction kettle barrel |
| CN103231216A (en) * | 2013-05-10 | 2013-08-07 | 山东亚盛重工股份有限公司 | Manufacturing technique and device for composite board |
| CN103272842A (en) * | 2013-06-14 | 2013-09-04 | 武汉钢铁(集团)公司 | Meshing type composite plate vacuum rolling preparation method |
| CN103286129A (en) * | 2013-07-01 | 2013-09-11 | 烟台开发区蓝鲸金属修复有限公司 | Copper plate rolling method |
| CN103639203A (en) * | 2013-11-10 | 2014-03-19 | 中国第一重型机械股份公司 | Vacuum packaging method for symmetric hot rolling manufactured stainless steel clad plates |
| CN103658175A (en) * | 2013-12-03 | 2014-03-26 | 河北钢铁股份有限公司 | Method for manufacturing metal composite plate |
| CN104028556A (en) * | 2014-06-05 | 2014-09-10 | 鞍山亚盛特钢有限公司 | Method for rolling multi-layered metal alloy composite steel plate |
| CN104209323A (en) * | 2013-05-31 | 2014-12-17 | 宝山钢铁股份有限公司 | Carbon steel plate blank combined surface pretreatment method for sandwich rolling process thick plate production |
| CN104551673A (en) * | 2014-12-23 | 2015-04-29 | 山东钢铁股份有限公司 | Method for producing ultrathin-size wide medium plate in a pack rolling way |
| CN105251971A (en) * | 2015-10-10 | 2016-01-20 | 燕山大学 | Interlayer vacuum coating method during blank manufacturing process of hot rolling composite plate |
| CN105880285A (en) * | 2016-06-13 | 2016-08-24 | 河北工业大学 | Vacuum hot rolling method of stainless steel composite plate |
| CN106077089A (en) * | 2015-11-10 | 2016-11-09 | 浦晓波 | A kind of manufacture method of double-layer stainless steel composite plate |
| CN106271414A (en) * | 2016-08-23 | 2017-01-04 | 南京钢铁股份有限公司 | A kind of preparation method of TMCP type bridge stainless steel clad plate |
| CN107052050A (en) * | 2017-06-26 | 2017-08-18 | 河北工业大学 | A kind of efficient isolation production method of stainless steel clad plate |
| CN107984162A (en) * | 2016-10-26 | 2018-05-04 | 航天特种材料及工艺技术研究所 | A kind of sealing method and structure for superplastic forming/diffusion connection |
| WO2019128363A1 (en) * | 2017-12-25 | 2019-07-04 | 南京钢铁股份有限公司 | Preparation method of tmcp double phase stainless steel composite board for ship |
| CN111299974A (en) * | 2020-03-13 | 2020-06-19 | 科斯焊接技术(无锡)有限公司 | Symmetric hot-rolled composite plate blank and seal welding method thereof |
| CN112548499A (en) * | 2020-12-05 | 2021-03-26 | 安徽宝恒新材料科技有限公司 | Processing method of three-layer composite steel plate |
| CN112692514A (en) * | 2020-12-03 | 2021-04-23 | 河南省西交轻质合金新材料研究院有限公司 | Method for producing alloy/metal-based composite material plate by using circular ingot blank |
| CN114618884A (en) * | 2022-03-30 | 2022-06-14 | 鞍钢股份有限公司 | Production method of carbon steel and stainless steel hot-rolled composite coiled plate |
| WO2023065805A1 (en) * | 2021-10-18 | 2023-04-27 | 南京钢铁股份有限公司 | Stainless steel composite plate for weathering steel bridge having low yield ratio |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0475791A (en) * | 1990-03-30 | 1992-03-10 | Nippon Steel Corp | Production of clad steel plate |
| JPH05192777A (en) * | 1992-01-21 | 1993-08-03 | Sumitomo Metal Ind Ltd | Manufacture of copper clad steel sheet |
| JP2514858B2 (en) * | 1990-11-05 | 1996-07-10 | 株式会社日本製鋼所 | Manufacturing method of clad steel plate |
| CN1205257A (en) * | 1998-05-22 | 1999-01-20 | 陈忠林 | Method of mfg. metal compounded plate |
| CN1669687A (en) * | 2005-04-04 | 2005-09-21 | 吉欣（英德）热轧不锈复合钢有限公司 | Process for producing brazing hot rolled metal composite plate adopting composite cog |
| CN101214745A (en) * | 2008-01-07 | 2008-07-09 | 吉欣（英德）热轧不锈复合钢有限公司 | Double-layer stainless steel composite thin plate and its processing method |
-
2011
- 2011-09-07 CN CN201110270155A patent/CN102319732A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0475791A (en) * | 1990-03-30 | 1992-03-10 | Nippon Steel Corp | Production of clad steel plate |
| JP2514858B2 (en) * | 1990-11-05 | 1996-07-10 | 株式会社日本製鋼所 | Manufacturing method of clad steel plate |
| JPH05192777A (en) * | 1992-01-21 | 1993-08-03 | Sumitomo Metal Ind Ltd | Manufacture of copper clad steel sheet |
| CN1205257A (en) * | 1998-05-22 | 1999-01-20 | 陈忠林 | Method of mfg. metal compounded plate |
| CN1669687A (en) * | 2005-04-04 | 2005-09-21 | 吉欣（英德）热轧不锈复合钢有限公司 | Process for producing brazing hot rolled metal composite plate adopting composite cog |
| CN101214745A (en) * | 2008-01-07 | 2008-07-09 | 吉欣（英德）热轧不锈复合钢有限公司 | Double-layer stainless steel composite thin plate and its processing method |
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581573B (en) * | 2012-03-19 | 2014-01-22 | 沈阳航新金属复合科技有限公司 | Method for hot-rolling and preparing composite plates by means of hot spraying preset brazing filler materials |
| CN102581573A (en) * | 2012-03-19 | 2012-07-18 | 沈阳航新金属复合科技有限公司 | Method for hot-rolling and preparing composite plates by means of hot spraying preset brazing filler materials |
| CN102764960A (en) * | 2012-07-27 | 2012-11-07 | 济钢集团有限公司 | Method for manufacturing composite steel plate for hydrogenation reaction kettle barrel |
| CN103231216B (en) * | 2013-05-10 | 2015-11-11 | 山东亚盛重工股份有限公司 | The production technology of composite plate and production equipment thereof |
| CN103231216A (en) * | 2013-05-10 | 2013-08-07 | 山东亚盛重工股份有限公司 | Manufacturing technique and device for composite board |
| CN104209323B (en) * | 2013-05-31 | 2016-10-05 | 宝山钢铁股份有限公司 | A kind of sandwich rolling process produces slab carbon steel plate slab mating surface preprocess method |
| CN104209323A (en) * | 2013-05-31 | 2014-12-17 | 宝山钢铁股份有限公司 | Carbon steel plate blank combined surface pretreatment method for sandwich rolling process thick plate production |
| CN103272842A (en) * | 2013-06-14 | 2013-09-04 | 武汉钢铁(集团)公司 | Meshing type composite plate vacuum rolling preparation method |
| CN103286129A (en) * | 2013-07-01 | 2013-09-11 | 烟台开发区蓝鲸金属修复有限公司 | Copper plate rolling method |
| CN103639203A (en) * | 2013-11-10 | 2014-03-19 | 中国第一重型机械股份公司 | Vacuum packaging method for symmetric hot rolling manufactured stainless steel clad plates |
| CN103639203B (en) * | 2013-11-10 | 2016-05-18 | 中国第一重型机械股份公司 | The vacuum packaging method of stainless steel clad plate is manufactured in symmetrical hot rolling |
| CN103658175A (en) * | 2013-12-03 | 2014-03-26 | 河北钢铁股份有限公司 | Method for manufacturing metal composite plate |
| CN103658175B (en) * | 2013-12-03 | 2015-07-01 | 河北钢铁股份有限公司 | Method for manufacturing metal composite plate |
| CN104028556A (en) * | 2014-06-05 | 2014-09-10 | 鞍山亚盛特钢有限公司 | Method for rolling multi-layered metal alloy composite steel plate |
| CN104551673A (en) * | 2014-12-23 | 2015-04-29 | 山东钢铁股份有限公司 | Method for producing ultrathin-size wide medium plate in a pack rolling way |
| CN105251971A (en) * | 2015-10-10 | 2016-01-20 | 燕山大学 | Interlayer vacuum coating method during blank manufacturing process of hot rolling composite plate |
| CN106077089A (en) * | 2015-11-10 | 2016-11-09 | 浦晓波 | A kind of manufacture method of double-layer stainless steel composite plate |
| CN105880285A (en) * | 2016-06-13 | 2016-08-24 | 河北工业大学 | Vacuum hot rolling method of stainless steel composite plate |
| CN106271414A (en) * | 2016-08-23 | 2017-01-04 | 南京钢铁股份有限公司 | A kind of preparation method of TMCP type bridge stainless steel clad plate |
| CN106271414B (en) * | 2016-08-23 | 2018-06-19 | 南京钢铁股份有限公司 | A kind of preparation method of TMCP types bridge stainless steel clad plate |
| CN107984162A (en) * | 2016-10-26 | 2018-05-04 | 航天特种材料及工艺技术研究所 | A kind of sealing method and structure for superplastic forming/diffusion connection |
| CN107052050A (en) * | 2017-06-26 | 2017-08-18 | 河北工业大学 | A kind of efficient isolation production method of stainless steel clad plate |
| WO2019128363A1 (en) * | 2017-12-25 | 2019-07-04 | 南京钢铁股份有限公司 | Preparation method of tmcp double phase stainless steel composite board for ship |
| CN111299974A (en) * | 2020-03-13 | 2020-06-19 | 科斯焊接技术(无锡)有限公司 | Symmetric hot-rolled composite plate blank and seal welding method thereof |
| CN112692514A (en) * | 2020-12-03 | 2021-04-23 | 河南省西交轻质合金新材料研究院有限公司 | Method for producing alloy/metal-based composite material plate by using circular ingot blank |
| CN112548499A (en) * | 2020-12-05 | 2021-03-26 | 安徽宝恒新材料科技有限公司 | Processing method of three-layer composite steel plate |
| CN112548499B (en) * | 2020-12-05 | 2022-11-18 | 安徽宝恒新材料科技有限公司 | Processing method of three-layer composite steel plate |
| WO2023065805A1 (en) * | 2021-10-18 | 2023-04-27 | 南京钢铁股份有限公司 | Stainless steel composite plate for weathering steel bridge having low yield ratio |
| CN114618884A (en) * | 2022-03-30 | 2022-06-14 | 鞍钢股份有限公司 | Production method of carbon steel and stainless steel hot-rolled composite coiled plate |
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Application publication date: 20120118 |