CN1456416A - Effetively local cooling method for thin wall workpieces in laser smelting coating, hot spray coating and welding - Google Patents
Effetively local cooling method for thin wall workpieces in laser smelting coating, hot spray coating and welding Download PDFInfo
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- CN1456416A CN1456416A CN03119343A CN03119343A CN1456416A CN 1456416 A CN1456416 A CN 1456416A CN 03119343 A CN03119343 A CN 03119343A CN 03119343 A CN03119343 A CN 03119343A CN 1456416 A CN1456416 A CN 1456416A
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Abstract
An efficient cooling method for the thin-wall workpiece in laser depositing, hot spraying, or welding features that based on the principle that the phase-change latent heat of metallic smelting can suck heat effectively, locally and unstably, the thin sheet or powder of cooling metal such as Al, Pb, or Sn, which has low smelting point, high toughness and high thermal conductivity is in contact with the back of the surface to be processed of the thin-wall workpiece.
Description
Technical field
The present invention relates to a kind of cooling treatment method, be meant more specifically a kind of prevent thin-walled parts acutely add in the hot procedure in unstable state such as laser melting coating, thermal spraying and welding excessively be heated, distortion, burning, the local efficient cooling treatment method that burns.
Background of invention
In industry such as Aeronautics and Astronautics, machinery, iron and steel and automobile, boats and ships, there are a large amount of thin-walled parts, often will carry out processing such as laser melting coating, thermal spraying (including plasma spraying, flame-spraying, electric arc spraying etc.) and welding (including laser weld, arc welding, flame welding, electron beam welding, plasma welding etc.) to it and handle.Acutely heat in these processing unstable state in processing procedures, as easy as rolling off a logly cause that thin-walled parts excessively is heated, distortion, burning and burn, had a strong impact on the size of part, reduced the performance indications such as intensity of part, even part is scrapped.Therefore must in process, effectively cool off thin-walled parts, acutely add excessively being heated in the hot procedure, distortion, burning, burn in unstable state, guarantee its instructions for use to prevent it.
Unstable state such as laser melting coating, welding, spraying acutely adds hot-working, and heating intensity is big, and hot-fluid is concentrated, the part heating rate is exceedingly fast, and thermal source and workpiece keep the relative motion state, and the local heat time is short, just make the parts locally fusing or produce little molten at piece surface.This mode of heating obviously is different from the whole evenly heating of batch-type furnace to part, cause easily thin-walled parts distortion, overheated, burning, burn.
At present, in the violent heating processes of unstable state such as laser melting coating, thermal spraying and welding, the method of main employing mechanical grip prevents the temperature distortion of thin-walled parts, the frock of bringing thus is very complicated, implement also comparatively difficulty, and this method can not prevent that thin-walled parts excessively is heated, burning, the performance decrease such as intensity of burning and causing thus.The now general cooling technology that adopts is to utilize material thermal capacitance heat absorption principle, conducts radiating and cooling by convection current, the heat of gas, liquid medium, because the material isobaric heat capacity is general only at 20～40 J K
-1Mol
-1In the scope, and the heating in the process such as laser melting coating, thermal spraying and welding has the feature of unstable state and severity, adopt the cooling effect of this kind method little to thin-walled parts, be difficult to effectively prevent that thin-walled parts excessively is heated, distortion, burning, burn.
In order to overcome the deficiency of above-mentioned cooling means, the present invention proposes a kind of being widely used in the industry such as Aeronautics and Astronautics, machinery, iron and steel and automobile, boats and ships, prevent the thin-walled parts acutely add in the hot procedure in unstable state such as laser melting coating, thermal spraying and welding excessively be heated, distortion, burning, the local efficient cooling treatment method that burns.
Goal of the invention
The objective of the invention is, add the effective cooling problem that runs in the hot procedure at above-mentioned thin-walled parts at the violent high temperature of unstable state, based on the local efficient heat absorption principle of low-melting-point metal fusing latent heat of phase change unstable state, proposed a kind of prevent thin-walled parts acutely add in the hot procedure in unstable state such as laser melting coating, thermal spraying and welding excessively be heated, distortion, burning, the local efficient cooling technology method of burning.This technical method is implemented simple and direct, economically feasible, can be widely used in the industry such as Aeronautics and Astronautics, machinery, iron and steel and automobile, boats and ships.
Summary of the invention
The local efficient cooling means of a kind of thin-walled parts in laser melting coating, thermal spraying and welding processing, the local efficient heat absorption principle of its cooling utilization metal molten latent heat of phase change unstable state, adopt the low melting point cool metal to contact with the back side machinery of to be processed of thin-walled parts, realize local efficient cooling, prevent thin-walled parts excessively being heated in process, distortion, burning, burn that this cooling means can be applicable to laser melting coating, thermal spraying, welding unstable state and acutely adds in the hot procedure.The low melting point cool metal places the back side of thin-walled parts machined surface to be processed, and the light sheet material of cool metal aluminium, lead, tin, thickness are between 1mm～10mm, and the shape size is suitable with thin-walled parts to be processed.
In the present invention heating temperature is required to be no more than 700 ℃ thin-walled parts, aluminium or aluminium alloy sheet material be as cool metal, can prevent thin-walled parts in laser melting coating, thermal spraying, be welded on unstable state and acutely add excessively being heated in the hot procedure, distortion, burning, burn.
In the present invention heating temperature is required to be no more than 350 ℃ thin-walled parts, select for use the flat lead material as cool metal, can prevent thin-walled parts in laser melting coating, thermal spraying, be welded on unstable state and acutely add excessively being heated in the hot procedure, distortion, burning, burn.
In the present invention heating temperature is required to be no more than 250 ℃ thin-walled parts, select for use the tin light sheet material as cool metal, can prevent thin-walled parts in laser melting coating, thermal spraying, be welded on unstable state and acutely add excessively being heated in the hot procedure, distortion, burning, burn.
Also can the cool metal light sheet material of same material is stacked in the described cooling means, realize heat absorption cooling more efficiently.
Cool metal can also be selected the low-melting-point metal powder for use in the described cooling means, adopts bonding agent that the back side of to be processed of itself and thin-walled parts is bonded together.
A kind of thin-walled parts that prevents of the present invention adds local cooling means in the hot-working processing procedure in unstable state, has following several respects unique distinction:
1, caloric receptivity is big, because the latent heat of fusion of metal is very big, generally at 10～30 kJ mol
-1Between, the caloric receptivity that melts moment is just very big;
2, heat absorption speed is fast, and moment finishes;
3,, can realize the heating temperature control of thin-walled parts in process to the different heating temperature requirement by selecting the cool metal of different melting points for use;
4, method is implemented simple and convenient, economically feasible.
Description of drawings
Fig. 1 is the cooling processing schematic diagram of circular thin-walled parts of the present invention in laser cladding process.
Fig. 2 is the cross sectional material structure partial enlarged diagram of Fig. 1.
Fig. 3 is the cooling processing schematic diagram of lath-shaped thin-walled parts of the present invention in welding process.
Fig. 3 (a) is a burn-through not, the cooling processing schematic diagram in the mechanical grip welding process.
Fig. 3 (b) is a burn-through not, the cooling processing schematic diagram in the spring compression welding process.
Fig. 3 (c) is a burn-through, the cooling processing schematic diagram in the spring compression welding process.
Among the figure: 1. powder feeder 2. laser melting coating molten baths 3. laser cladding coatings, 4. circular thin-walled parts 5. low melting point cool metals 6. compress steel band 301. welding pools 302. lath-shaped thin-walled parts 303. low melting point cool metals 304. and compress steel plate 305. springs
The specific embodiment
The present invention is that a kind of thin-walled parts is at laser melting coating, local efficient cooling means in thermal spraying and the welding processing, be that a kind of preventing excessively is heated in the thin-walled parts process, distortion, burning, the local efficient cooling processing technology of burning, this cooling means is mainly used the local efficient heat absorption principle of metal molten latent heat of phase change unstable state, adopt cool metal to contact with the back side machinery of to be processed of thin-walled parts, realize local efficient cooling, prevent excessively being heated of thin-walled parts, distortion, burning, burn, its used low melting point cool metal places the back side of thin-walled parts machined surface to be processed, cool metal can be aluminium, plumbous, fusing points such as tin are lower, toughness is better, the light sheet material of high thermal conductivity, thickness is between 1mm～10mm, the shape size is according to the thin-walled parts flexibility and changeability, according to actual needs, also the cool metal thin plate layer can be gathered into folds.
See also thin wall circular shape part laser melting coating processing shown in Figure 1, can not be with the circular ring-shaped member heating temperature above 700 ℃, selecting aluminium flake 5 is example as cool metal, with aluminium sheet rolling or the cutting into about the thick aluminium flake 5 of 5mm, length and width is suitable with circular ring-shaped member 4, and placing circular ring-shaped member 4 madial walls, the circular ring-shaped member that will have aluminium flake then is sleeved on the ring flange.For aluminium flake 5 is contacted with circular ring-shaped member 4 homogeneous phases, can between ring flange and circular ring-shaped member 4, install one and compress steel band 6.Just can carry out laser melting coating processing after fastening handles.Laser cladding technological parameter is decided according to concrete processing request as sweep speed (being the speed of related movement of thermal source and workpiece), laser power, powder feed rate etc.Like this with relative circular ring-shaped member 4 apparent motions of laser beam, reach about 650 ℃ of the melting temperatures of aluminium when circular ring-shaped member 4 local temperatures, aluminium flake 5 will absorb a large amount of heat rapidly by its sizable latent heat of fusion, thereby circular ring-shaped member 4 is carried out the efficient cooling in part in real time, circular ring-shaped member 4 temperature are controlled at below 700 ℃, have effectively prevented excessively being heated of thin-walled parts, distortion, burning, burnt.
See also thin-wall boards welding processing shown in Figure 3, can not be with the sheet material heating temperature above 350 ℃, selecting lead flake is example as cool metal, stereotype processing is thick into about 10mm, that 150mm is wide thin lead flake 303, whether reach the uniformity of two welding assembly thickness according to sheet material 302 burn-throughs, can adopt a lead flake 303 to place weld seam below, (Fig. 3 (a) is a burn-through not, the cooling schematic diagram in the mechanical grip welding process shown in Fig. 3 (a, b).Fig. 3 (b) is a burn-through not, the cooling schematic diagram in the spring compression welding process.), or two lead flakes 303 are placed near weld seam, (Fig. 3 (c) is a burn-through, the cooling schematic diagram in the spring compression welding process shown in Fig. 3 (c).), more directly with compress steel plate 304 mechanical grip or lead flake 303 with compress 304 of steel plates and make cool metal lead flake 303 and sheet material 302 mechanical contacts by spring 305.Like this with relative sheet material 302 apparent motions of welding heat source, when sheet material 302 local temperatures reach about 327 ℃ of plumbous melting temperatures, lead flake 303 will absorb a large amount of heat rapidly by its sizable latent heat of fusion, thereby sheet material 302 is carried out the efficient cooling in part in real time, sheet material 302 temperature are controlled at below 350 ℃, have effectively prevented excessively being heated of thin-walled parts, distortion, burning, burnt.
In the present invention, heating temperature is required to surpass 700 ℃ thin-walled parts to be processed, aluminium or aluminium alloy sheet are as cool metal.Heating temperature is required to surpass 350 ℃ thin-walled parts to be processed, select for use flat lead as cool metal.Heating temperature is required to surpass 250 ℃ thin-walled parts to be processed, select for use the tin thin plate as cool metal.
In addition, because the restriction of cool metal toughness of material, not easy-to-use thicker cool metal sheet is adaptive with the shape of curve form part to be processed, the cool metal thin plate layer of same material can be gathered into folds, and realizes that heat absorption is cooled off more efficiently.
Process for part in irregular shape, can select the low-melting-point metal powder for use, adopt suitable bonding agent that the back side of to be processed of itself and part is bonded together and process cooling processing.Bonding agent can be selected waterglass for use, and completion of processing adopts sandblast or mechanical curettage method to remove and picks up the knot agent.
Cooling means of the present invention is applicable to laser melting coating, thermal spraying (plasma spraying, flame-spraying, electric arc spraying etc.) and welding processing such as (laser weld, arc welding, flame welding, electron beam welding, plasma welding etc.).
Claims (7)
1, the local efficient cooling means of a kind of thin-walled parts in laser melting coating, thermal spraying and welding processing, it is characterized in that: the local efficient heat absorption principle of cooling utilization metal molten latent heat of phase change unstable state, adopt the low melting point cool metal to contact with the back side machinery of thin-walled parts machined surface, realize local efficient cooling, prevent thin-walled parts excessively being heated in process, distortion, burning, burn that this cooling means can be applicable to laser melting coating, thermal spraying, welding unstable state and acutely adds in the hot procedure.
2, the local efficient cooling means of thin-walled parts according to claim 1 in laser melting coating, thermal spraying and welding processing, it is characterized in that: the low melting point cool metal places the back side of thin-walled parts machined surface to be processed, but the light sheet material of cool metal aluminium, lead, tin, thickness is between 1mm～10mm, and the shape size is suitable with thin-walled parts to be processed.
3, according to claim 1, the 2 described thin-walled parts local efficient cooling means in laser melting coating, thermal spraying and welding processing, it is characterized in that: heating temperature is required to be no more than 700 ℃ thin-walled parts, aluminium or aluminium alloy sheet material be as cool metal, can prevent thin-walled parts in laser melting coating, thermal spraying, be welded on unstable state and acutely add excessively being heated in the hot procedure, distortion, burning, burn.
4, according to claim 1, the 2 described thin-walled parts local efficient cooling means in laser melting coating, thermal spraying and welding processing, it is characterized in that: heating temperature is required to be no more than 350 ℃ thin-walled parts, select for use the flat lead material as cool metal, can prevent thin-walled parts in laser melting coating, thermal spraying, be welded on unstable state and acutely add excessively being heated in the hot procedure, distortion, burning, burn.
5, according to claim 1, the 2 described thin-walled parts local efficient cooling means in laser melting coating, thermal spraying and welding processing, it is characterized in that: heating temperature is required to be no more than 250 ℃ thin-walled parts, select for use the tin light sheet material as cool metal, can prevent thin-walled parts in laser melting coating, thermal spraying, be welded on unstable state and acutely add excessively being heated in the hot procedure, distortion, burning, burn.
6, the local efficient cooling means of thin-walled parts according to claim 2 in laser melting coating, thermal spraying and welding processing is characterized in that: also can the cool metal light sheet material of same material is stacked, realize heat absorption cooling more efficiently.
7, according to claim 1, the 2 described thin-walled parts local efficient cooling means in laser melting coating, thermal spraying and welding processing, it is characterized in that: cool metal can also be selected the low-melting-point metal powder for use, adopts bonding agent that the back side of to be processed of itself and thin-walled parts is bonded together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031193439A CN1224494C (en) | 2003-03-17 | 2003-03-17 | Effetively local cooling method for thin wall workpieces in laser smelting coating, hot spray coating and welding |
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| CNB031193439A CN1224494C (en) | 2003-03-17 | 2003-03-17 | Effetively local cooling method for thin wall workpieces in laser smelting coating, hot spray coating and welding |
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| CN1224494C CN1224494C (en) | 2005-10-26 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006121511A1 (en) * | 2005-05-10 | 2006-11-16 | Honeywell International Inc. | Method of repair of thin-wall housings |
| CN101539443B (en) * | 2009-04-27 | 2010-09-22 | 北京航空航天大学 | System for measuring air injection volume of plasma jet |
| CN101450422B (en) * | 2008-12-17 | 2011-05-04 | 深圳市大族激光科技股份有限公司 | Laser welding method of film aluminum product |
| CN104046983A (en) * | 2014-06-26 | 2014-09-17 | 西安交通大学 | Titanium alloy thin-wall blade laser-cladding low-stress local orientation cooling restoration method |
| CN108145290A (en) * | 2017-12-18 | 2018-06-12 | 中国航发贵州黎阳航空动力有限公司 | A kind of device and welding method for ring-shaped thin-walled part welding protecting back face |
| CN108406223A (en) * | 2018-04-25 | 2018-08-17 | 成都瑞合科技有限公司 | A kind of welding repair method and device of thin wall component |
| CN109442471A (en) * | 2018-09-29 | 2019-03-08 | 江苏科环新材料有限公司 | A kind of water-cooling wall pipe of heating surface Wear-proof and the preparation method and application thereof |
| CN111118495A (en) * | 2020-01-17 | 2020-05-08 | 中国航空制造技术研究院 | Method for repairing blade edge by high energy beam |
| CN111360495A (en) * | 2020-04-11 | 2020-07-03 | 河南省煤科院耐磨技术有限公司 | Preparation method of ultrathin bimetal wear-resisting plate |
| CN111633374A (en) * | 2020-06-01 | 2020-09-08 | 湖北三江航天江北机械工程有限公司 | Method for repairing damage inside attitude control engine combustion chamber shell |
| CN114682882A (en) * | 2022-05-11 | 2022-07-01 | 同方江新造船有限公司 | Method for preventing welding deformation of ship body |
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2003
- 2003-03-17 CN CNB031193439A patent/CN1224494C/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7367488B2 (en) | 2005-05-10 | 2008-05-06 | Honeywell International, Inc. | Method of repair of thin wall housings |
| WO2006121511A1 (en) * | 2005-05-10 | 2006-11-16 | Honeywell International Inc. | Method of repair of thin-wall housings |
| CN101450422B (en) * | 2008-12-17 | 2011-05-04 | 深圳市大族激光科技股份有限公司 | Laser welding method of film aluminum product |
| CN101539443B (en) * | 2009-04-27 | 2010-09-22 | 北京航空航天大学 | System for measuring air injection volume of plasma jet |
| CN104046983A (en) * | 2014-06-26 | 2014-09-17 | 西安交通大学 | Titanium alloy thin-wall blade laser-cladding low-stress local orientation cooling restoration method |
| CN108145290A (en) * | 2017-12-18 | 2018-06-12 | 中国航发贵州黎阳航空动力有限公司 | A kind of device and welding method for ring-shaped thin-walled part welding protecting back face |
| CN108406223B (en) * | 2018-04-25 | 2021-04-27 | 成都瑞合科技有限公司 | Welding repair method and device for thin-wall parts |
| CN108406223A (en) * | 2018-04-25 | 2018-08-17 | 成都瑞合科技有限公司 | A kind of welding repair method and device of thin wall component |
| CN109442471A (en) * | 2018-09-29 | 2019-03-08 | 江苏科环新材料有限公司 | A kind of water-cooling wall pipe of heating surface Wear-proof and the preparation method and application thereof |
| CN109442471B (en) * | 2018-09-29 | 2024-03-12 | 江苏科环新材料有限公司 | Abrasion-resistant water-cooled wall pipe for heating surface and preparation method and application thereof |
| CN111118495A (en) * | 2020-01-17 | 2020-05-08 | 中国航空制造技术研究院 | Method for repairing blade edge by high energy beam |
| CN111360495B (en) * | 2020-04-11 | 2021-08-24 | 河南省煤科院耐磨技术有限公司 | Preparation method of ultrathin bimetal wear-resisting plate |
| CN111360495A (en) * | 2020-04-11 | 2020-07-03 | 河南省煤科院耐磨技术有限公司 | Preparation method of ultrathin bimetal wear-resisting plate |
| CN111633374A (en) * | 2020-06-01 | 2020-09-08 | 湖北三江航天江北机械工程有限公司 | Method for repairing damage inside attitude control engine combustion chamber shell |
| CN114682882A (en) * | 2022-05-11 | 2022-07-01 | 同方江新造船有限公司 | Method for preventing welding deformation of ship body |
| CN114682882B (en) * | 2022-05-11 | 2023-08-11 | 同方江新造船有限公司 | Method for preventing welding deformation of ship body |
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| CN1224494C (en) | 2005-10-26 |
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