CN101406977A - Vacuum brazing method for pump impeller - Google Patents
Vacuum brazing method for pump impeller Download PDFInfo
- Publication number
- CN101406977A CN101406977A CNA2008102274481A CN200810227448A CN101406977A CN 101406977 A CN101406977 A CN 101406977A CN A2008102274481 A CNA2008102274481 A CN A2008102274481A CN 200810227448 A CN200810227448 A CN 200810227448A CN 101406977 A CN101406977 A CN 101406977A
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- pump impeller
- welded
- weld tabs
- blade
- brazing method
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Abstract
The invention relates to a vacuum brazing method for a pump impeller, which comprises the following steps: 1) cutting soldering terminals into shapes corresponding to those of the cross sections of blades on an impeller, and punching positioning holes on the 2 to 3 soldering terminals; 2) cleaning a pump impeller to be welded and the soldering terminals, and checking the smoothness of welding surfaces of the blades; 3) preheating the pump impeller to be welded; 4) coating the welding surfaces of the blades to be welded with welding flux, placing the soldering terminals on the welding surfaces of the blades, and then coating the welding flux on the upper surfaces of the soldering terminals; 5) using a pump cover to cover the upper surfaces of the soldering terminals, and using positioning pins to fix the pump cover on the soldering terminals; 6) assembling an upper pressed tyre and a lower pressed tyre together by the pump impeller to be welded; 7) sending an assembly into a heating chamber in a vacuum furnace for heating; and 8) taking out a workpiece after the temperature reduction. The pump impeller brazed by the method has uniform and full welding seams, apparent circular arcs at interfaces, compactly combined welding surfaces, no air holes, high welding strength, and longer service life.
Description
Technical field
The present invention relates to a kind of method for welding, particularly about shunt vacuum brazing method for pump impeller in the transmission case of a kind of hydraulic power.
Background technology
In the railroad traction transmission process, shunt drives such as pump impeller in the transmission case of hydraulic power are being born the task of power transmission, the overall performance of locomotive is being brought into play important effect, its mode of production is to adopt the seam of salt bath brazing method after the machined production moulding, the used raw material of salt bath brazing method mainly contain scolder, scaling powder, welding agent (soldering salt), each component content following (as shown in table 1):
Table 1
The salt bath brazing method is: the impeller sheet that earlier weld tabs is cut into pump impeller, and the outward flange that is a bit larger tham impeller blade, be coated with then and spread scaling powder, with upper and lower disc to connecting, and impeller to be welded fixed with frock, adopt homemade soldering workpiece to be welded to be heated in special soldering oven again with salt, at last the finished product impeller is carried out surface clean, wash the salinity that coats on the finished product impeller off, finish the salt bath brazing process.As shown in Figure 1, be above-mentioned salt bath brazing process curve.
Though above-mentioned salt bath brazing method is fairly simple, and devices needed, frock are less demanding, and common pit furnace gets final product, and its maximum shortcoming is that environmental pollution is serious, and operating personnel and atmospheric environment are produced harmful effect.This is because of cadmium and zinc in the used solder compositions (as shown in table 1) in the brazing process, and boric acid, borax in the welding agent all are toxic component, and KF (potassium fluoride) heated volatile, can produce poisonous fluoride gas, not only can cause very big harm to health, also can pollutant atmosphere.What is more important, the used solder compositions of vacuum brazing must satisfy: the saturated vapor pressure under the room temperature is not higher than 10
-10Pa, saturated vapor pressure is not higher than 10 under the operating temperature
-8Pa.But zinc and cadmium that the salt bath brazing method is adopted, the saturated vapour pressure under operating temperature is respectively 133.3 * 10
2Mpa, 133.3 * 10
3Mpa, therefore, these two kinds of raw material are almost completely volatilization under operating temperature, thereby causes solder bond intensity not high, and weld seam is not full.Therefore, the used solder compositions of salt bath brazing method is not suitable for carrying out soldering under vacuum state, and this material can not be phosphorous, composition such as cadmium, zinc, lithium.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide a kind of weld strength height, weld seam is full, and the vacuum brazing method for pump impeller of environmental protection.
For achieving the above object, the present invention takes following technical scheme: a kind of vacuum brazing method for pump impeller, it is characterized in that: it may further comprise the steps: 1) weld tabs is cut into and impeller blade cross section corresponding shape, corresponding with the position of positioning hole on the blade to be welded, at 2～3 weld tabs upper punch locating holes; 2) clean pump impeller to be welded and weld tabs with cleaning agent, and check the smoothness of impeller blade solder side to be welded; 3) pump impeller to be welded is carried out preheating, preheat temperature is not less than 20 ℃, and the assembling environment temperature is not less than 16 ℃; 4) on the solder side of blade to be welded, apply solder flux, again each weld tabs is placed on the solder side of each blade, and after flattening directly with have gentle hands, again with the upper surface of flux coating at each weld tabs; 5) pump cover is covered upper surface at weld tabs, with alignment pin pump cover is fixed on going up of weld tabs after, evenly beat with hammering into shape, make the gap minimum between described pump cover and the weld tabs; 6) pressing down tire with one is placed on the platform, place an annular backing plate pressing down on the tire, after again the pump impeller that combines being inverted, pass the newel that presses down tire and be sitting in and press down on the tire, then a upper pressed tyre is enclosed within on the newel, and upper and lower pressure tire and pump impeller to be welded is fitted together with a nut; 7) heating clamber of sub-assembly being sent in the vacuum drying oven heats, and is warming up to 855 ℃, and controls temperature in 850～860 ℃ scope, and is evacuated to 8～3Pa, insulation 60min; 8) stop heating after, sub-assembly is moved to cold house cooling in the vacuum drying oven, when temperature is reduced to 200 ℃, sub-assembly is taken out from vacuum drying oven, in air, be cooled to room temperature.
In the described step 1), described weld tabs border is all than the big 0.5～1mm in the cross section of blade, and thickness is all less than 0.12mm and unanimity.
The used material of described weld tabs is the Ag65MnNi that HY company produces.
In the described step 4), the smoothness of blade solder side is meant when the solder side with blade to be welded is placed on the platform, detects gap between solder side and the platform with clearance gauge, and this gap is no more than 0.08mm, and does not have burr on the solder side of described blade.
Described step 2) cleaning agent in is a gasoline.
In the described step 6), solder flux adopts 102 solder flux.
The present invention is owing to take above technical scheme, it has the following advantages: 1, the present invention is because the vacuum scolder that adopts, the Ag65MnNi scolder of producing by HY company particularly, it has lower saturated vapour pressure, satisfy the requirement of saturated vapour pressure under the vacuum condition, so the pump impeller solder joint that soldering goes out is evenly full, the interface circular arc is obvious, and the face of weld is in conjunction with fine and close, pore-free, weld strength height.2, among the present invention owing to do not adopt the salt bath welding agent, only keep 102 solder flux of nontoxic pollution-free, therefore stopped pollution, realized the goal of the invention of environmental protection.3, the present invention has been owing to adopted vacuum drying oven, and pump impeller is moved into vacuum drying oven after heating cold house progressively cools off, and therefore the pump impeller that welds out can be not oxidized, and weld strength is further high, longer service life.
Description of drawings
Fig. 1 is the process curve figure of salt bath brazing method in the prior art
The cutaway view of pump impeller among Fig. 2 the present invention
Fig. 3 is the vertical view of pump impeller among the present invention
Fig. 4 is the vertical view of upper pressed tyre in the frock
Fig. 5 is the cutaway view of Fig. 4
Fig. 6 is the vertical view that presses down tire in the frock of the present invention
Fig. 7 is the side view of Fig. 6
Fig. 8 is the cutaway view of the sub-assembly of the present invention's two pump impellers
Fig. 9 is process curve figure of the present invention
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As Fig. 2, shown in Figure 3, the present invention's hydraulic power to be brazed pump impeller in the transmission case of shunting, it comprises the impeller 1 of one " protruding " shape, circumferential surface at impeller 1 has a circle blade 2 that is provided with at interval, in each blade 2 end one pump cover 3 is set, on 2～3 blades 2,, in each locating hole, insert an alignment pin 4, so that impeller 1 and pump cover 3 are combined with the pump cover 3 corresponding locating holes that are provided with.Desire of the present invention by vacuum brazing method with blade 2 solderings on pump cover 3 and the impeller 1 together.
Be vacuum brazing method for pump impeller of the present invention below, it may further comprise the steps:
1, weld tabs 5 is cut into and blade 2 cross section corresponding shape, weld tabs 5 borders are all than the big 0.5～1mm in the cross section of blade 2, and with the appearance of weld of assurance weld tabs and blade 2 solders side, and the thickness requirement of weld tabs 5 is less than 0.12mm and unanimity.2～3 weld tabs 5 upper punch locating holes therein, the position of this locating hole is corresponding with the position of positioning hole on the blade 2 to be welded.The material that weld tabs 5 adopts can be the Ag65MnNi that HY company produces, and the material that weld tabs 5 adopts can not have interlayer or contain other impurity component.
2, as Fig. 5～shown in Figure 8, a upper and lower pressure tire 6,8 is set, upper pressed tyre 6 is a cross, and its center has a through hole 7; Pressing down tire 8 is a disk, has a newel 9 on the disk, and newel 9 tops have screw thread 10.Upper and lower pressure tire 6,8 all adopts heat-resisting steel material to make, and pressing down on the card of tire 8 can be the hollow out with cross muscle, with weight reduction.
3, with cleaning agent (, but being not limited thereto) impeller 1 and weld tabs 5 are cleaned, use dried cloth wiped clean then such as gasoline.
4, with the blade 2 of impeller 1 to be welded to being placed down on the platform, check the solder side of blade 2 to be welded and the gap between the platform with clearance gauge, the gap requires evenly and is no more than 0.08mm, and does not have burr on the solder side of blade to be welded 2.
5, require before workpiece assembling pump impeller preheating to be welded, preheat temperature must not be lower than 20 ℃ and assemble environment temperature and be not less than 16 ℃.
6, the blade 2 with impeller 1 to be welded upwards is placed on the platform, and the solder flux (such as 102 solder flux, but being not limited thereto) that mediation is good is coated on the solder side of blade 2 to be welded, then each weld tabs 5 is placed in respectively on the solder side of each blade 2, and flattens straight with have gentle hands; Use the upper surface of flux coating again at each weld tabs 5.
7, pump cover 3 is covered at weld tabs 5 upper surfaces, pump cover 3 and impeller 1 are linked into an integrated entity, evenly beat with hammer then, keep even and minimum to guarantee the gap between blade 2 and the pump cover 3 with alignment pin 4.The combination back checks whether the putting position and the blade 2 of weld tabs 5 have dislocation, as has dislocation and will in time adjust, and the external part of each alignment pin 4 requires to be higher than the outer surface 3～4mm of pump cover 3.
8, will press down tire 6 is placed on the platform, in pump impeller bottom and press down and be placed with an annular backing plate 11 between the tire 8, after again the pump impeller that combines being inverted, pass the newel 9 that presses down tire 8, the protuberance of pump impeller is penetrated in the annular backing plate, and pump impeller is sitting in press down on the tire, a cover mold can stack 2～3 pump impellers to be welded simultaneously, then upper pressed tyre 6 is enclosed within on the newel 9, and upper and lower pressure tire 6,8 and pump impeller to be welded is fitted together with a nut 12.
9, as shown in Figure 9, the heating clamber that sub-assembly is sent in the vacuum drying oven heats, and is warming up to 855 ℃, and is controlled in 850～860 ℃ of temperature ranges, and be evacuated to 8～3Pa, about insulation 60min.
10, stop heating after, sub-assembly is moved to cold house cooling in the vacuum drying oven, when temperature is reduced to 200 ℃, sub-assembly is taken out from vacuum drying oven, in air, be cooled to room temperature.
Claims (10)
1, a kind of vacuum brazing method for pump impeller, it is characterized in that: it may further comprise the steps:
1) weld tabs is cut into and impeller blade cross section corresponding shape, corresponding with the position of positioning hole on the blade to be welded, at 2～3 weld tabs upper punch locating holes;
2) clean pump impeller to be welded and weld tabs with cleaning agent, and check the smoothness of impeller blade solder side to be welded;
3) pump impeller to be welded is carried out preheating, preheat temperature is not less than 20 ℃, and the assembling environment temperature is not less than 16 ℃;
4) on the solder side of blade to be welded, apply solder flux, again each weld tabs is placed on the solder side of each blade, and after flattening directly with have gentle hands, again with the upper surface of flux coating at each weld tabs;
5) pump cover is covered upper surface at weld tabs, with alignment pin pump cover is fixed on going up of weld tabs after, evenly beat with hammering into shape, make the gap minimum between described pump cover and the weld tabs;
6) pressing down tire with one is placed on the platform, place an annular backing plate pressing down on the tire, after again the pump impeller that combines being inverted, pass the newel that presses down tire and be sitting in and press down on the tire, then a upper pressed tyre is enclosed within on the newel, and upper and lower pressure tire and pump impeller to be welded is fitted together with a nut;
7) heating clamber of sub-assembly being sent in the vacuum drying oven heats, and is warming up to 855 ℃, and controls temperature in 850～860 ℃ scope, and is evacuated to 8～3Pa, insulation 60min;
8) stop heating after, sub-assembly is moved to cold house cooling in the vacuum drying oven, when temperature is reduced to 200 ℃, sub-assembly is taken out from vacuum drying oven, in air, be cooled to room temperature.
2, a kind of vacuum brazing method for pump impeller as claimed in claim 1 is characterized in that: in the described step 1), described weld tabs border is all than the big 0.5～1mm in the cross section of blade, and thickness is all less than 0.12mm and unanimity.
3, a kind of vacuum brazing method for pump impeller as claimed in claim 1 is characterized in that: the used material of described weld tabs is the Ag65MnNi that HY company produces.
4, a kind of vacuum brazing method for pump impeller as claimed in claim 2 is characterized in that: the used material of described weld tabs is the Ag65MnNi that HY company produces.
5, as claim 1 or 2 or 3 or 4 described a kind of vacuum brazing method for pump impeller, it is characterized in that: in the described step 4), the smoothness of blade solder side is meant when the solder side with blade to be welded is placed on the platform, with the gap between clearance gauge detection solder side and the platform, this gap is no more than 0.08mm, and does not have burr on the solder side of described blade.
6, as claim 1 or 2 or 3 or 4 described a kind of vacuum brazing method for pump impeller, it is characterized in that: the cleaning agent described step 2) is a gasoline.
7, a kind of vacuum brazing method for pump impeller as claimed in claim 5 is characterized in that: the cleaning agent described step 2) is a gasoline.
8, as claim 1 or 2 or 3 or 4 or 7 described a kind of vacuum brazing method for pump impeller, it is characterized in that: in the described step 6), solder flux adopts 102 solder flux.
9, a kind of vacuum brazing method for pump impeller as claimed in claim 5 is characterized in that: in the described step 6), solder flux adopts 102 solder flux.
10, a kind of vacuum brazing method for pump impeller as claimed in claim 6 is characterized in that: in the described step 6), solder flux adopts 102 solder flux.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102274481A CN101406977B (en) | 2008-11-25 | 2008-11-25 | Vacuum brazing method for pump impeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102274481A CN101406977B (en) | 2008-11-25 | 2008-11-25 | Vacuum brazing method for pump impeller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101406977A true CN101406977A (en) | 2009-04-15 |
| CN101406977B CN101406977B (en) | 2011-05-18 |
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ID=40570294
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102274481A Expired - Fee Related CN101406977B (en) | 2008-11-25 | 2008-11-25 | Vacuum brazing method for pump impeller |
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|---|---|
| CN (1) | CN101406977B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107342A (en) * | 2011-01-29 | 2011-06-29 | 东北金城建设股份有限公司 | Precision welding device for steel-structured circumferential welds for building |
| CN102139416A (en) * | 2011-03-22 | 2011-08-03 | 无锡太博泵业有限公司 | Mould for welding impeller |
| CN103008814A (en) * | 2012-12-14 | 2013-04-03 | 中国电子科技集团公司第三十八研究所 | Vacuum braze welding method of antenna submatrix |
| CN103143900A (en) * | 2013-04-02 | 2013-06-12 | 哈尔滨电机厂有限责任公司 | Welding manufacture process method for pump wheel of vertical shaft single-stage and single-suction centrifugal large-sized water pump |
| CN103386548A (en) * | 2013-07-04 | 2013-11-13 | 西安航空制动科技有限公司 | Coil rack diffusion welding method |
| CN104384757A (en) * | 2014-09-28 | 2015-03-04 | 杭州华光焊接新材料股份有限公司 | Preparation method of brass flux-cored welding ring |
| CN104607831A (en) * | 2015-01-19 | 2015-05-13 | 安徽舜禹水务实业有限公司 | Water pump impeller welding working station |
| CN106181270A (en) * | 2016-08-26 | 2016-12-07 | 常州索拉尔熔盐泵阀科技有限公司 | The preparation method of pump for liquid salts combination type blade wheel |
| CN113618184A (en) * | 2021-08-31 | 2021-11-09 | 贵州航天电子科技有限公司 | Brazing processing method for lead brass cavity in furnace |
| CN114192913A (en) * | 2021-12-20 | 2022-03-18 | 沈阳透平机械股份有限公司 | Brazing method for centrifugal compressor partition plate and centrifugal compressor partition plate |
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| CN1205399A (en) * | 1997-07-11 | 1999-01-20 | 株式会社日立制作所 | Motor-driven blower and method of manufacturing impeller for motor-driven blower |
| CN1098744C (en) * | 2000-12-09 | 2003-01-15 | 安徽叉车集团公司蚌埠液力机械厂 | Technology for machining pump wheel or turbine of hydraulic coupler |
| CN2490340Y (en) * | 2001-07-02 | 2002-05-08 | 协昌电机股份有限公司 | Improved structure of pump vane |
| CN100464918C (en) * | 2007-07-26 | 2009-03-04 | 上海交通大学 | Weld system for assembly of hydraulic torque converter, and welding method |
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2008
- 2008-11-25 CN CN2008102274481A patent/CN101406977B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107342B (en) * | 2011-01-29 | 2013-11-27 | 东北金城建设股份有限公司 | Precision welding device for steel-structured circumferential welds for building |
| CN102107342A (en) * | 2011-01-29 | 2011-06-29 | 东北金城建设股份有限公司 | Precision welding device for steel-structured circumferential welds for building |
| CN102139416A (en) * | 2011-03-22 | 2011-08-03 | 无锡太博泵业有限公司 | Mould for welding impeller |
| CN103008814A (en) * | 2012-12-14 | 2013-04-03 | 中国电子科技集团公司第三十八研究所 | Vacuum braze welding method of antenna submatrix |
| CN103008814B (en) * | 2012-12-14 | 2015-09-16 | 中国电子科技集团公司第三十八研究所 | A kind of vacuum brazing method of antenna submatrix |
| CN103143900B (en) * | 2013-04-02 | 2015-06-24 | 哈尔滨电机厂有限责任公司 | Welding manufacture process method for pump wheel of vertical shaft single-stage and single-suction centrifugal large-sized water pump |
| CN103143900A (en) * | 2013-04-02 | 2013-06-12 | 哈尔滨电机厂有限责任公司 | Welding manufacture process method for pump wheel of vertical shaft single-stage and single-suction centrifugal large-sized water pump |
| CN103386548B (en) * | 2013-07-04 | 2015-06-10 | 西安航空制动科技有限公司 | Coil rack diffusion welding method |
| CN103386548A (en) * | 2013-07-04 | 2013-11-13 | 西安航空制动科技有限公司 | Coil rack diffusion welding method |
| CN104384757A (en) * | 2014-09-28 | 2015-03-04 | 杭州华光焊接新材料股份有限公司 | Preparation method of brass flux-cored welding ring |
| CN104607831A (en) * | 2015-01-19 | 2015-05-13 | 安徽舜禹水务实业有限公司 | Water pump impeller welding working station |
| CN106181270A (en) * | 2016-08-26 | 2016-12-07 | 常州索拉尔熔盐泵阀科技有限公司 | The preparation method of pump for liquid salts combination type blade wheel |
| CN106181270B (en) * | 2016-08-26 | 2018-06-08 | 常州索拉尔熔盐泵阀科技有限公司 | The preparation method of pump for liquid salts combination type blade wheel |
| CN113618184A (en) * | 2021-08-31 | 2021-11-09 | 贵州航天电子科技有限公司 | Brazing processing method for lead brass cavity in furnace |
| CN114192913A (en) * | 2021-12-20 | 2022-03-18 | 沈阳透平机械股份有限公司 | Brazing method for centrifugal compressor partition plate and centrifugal compressor partition plate |
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| Publication number | Publication date |
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| CN101406977B (en) | 2011-05-18 |
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Granted publication date: 20110518 Termination date: 20181125 |