CN103722269A - Method for welding rotor cage strips and cage rings - Google Patents
Method for welding rotor cage strips and cage rings Download PDFInfo
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- CN103722269A CN103722269A CN201310752068.0A CN201310752068A CN103722269A CN 103722269 A CN103722269 A CN 103722269A CN 201310752068 A CN201310752068 A CN 201310752068A CN 103722269 A CN103722269 A CN 103722269A
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- short
- conducting sleeve
- circuited conducting
- rotor cage
- welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/12—Copper or alloys thereof
Abstract
The invention provides a method for welding rotor cage strips and cage rings. The rotor cage strips are made of tin-phosphor bronze, the cage rings are made of red copper, and the method comprises the following steps of (a) enabling the first end portions of the rotor cage strips and the first cage ring to be in abutting joint to form a connector, (b) enabling the rotor cage strips and the first cage ring to be preheated to be 150-300 DEG C in a heating furnace, (c) adopting an oxyacetylene welding method, welding the rotor cage strips on the first cage ring at the connector, (d) heating the whole first cage ring to be 350-400 DEG C, and then slowing cooling the whole first cage ring to be environmental temperature. According to the method, a welding joint of the rotor cage strips and the cage rings has the higher mechanical strength and welding quality, the defects of undercutting, cracks, incomplete penetration, incomplete fusion, slag inclusion, pores and the like are overcome, compactness of the welding joint is good, a motor rotor can run for 5-10 years, and the welding area of the rotor cage strips and the cage rings is not broken.
Description
Technical field
The present invention relates to the welding method of a kind of rotor cage bar and short-circuited conducting sleeve, more particularly, the present invention relates to a kind of rotor cage bar of being made by tin-phosphor bronze and the welding method of the short-circuited conducting sleeve made by red copper.
Background technology
Two cage induction motors are conventional electrical equipments in producing, and its effect is to be mechanical energy electric energy conversion, and it is large that it has unit volume capacity, the feature that starting torque is large, and power density or torque density are large.
The frequent starting of motor can make the rotor cage bar of motor repeatedly carry out heating and cooling, makes rotor cage bar replace the stressed high-tension motor rotor cage bar metal fatigue that causes.Short-circuited conducting sleeve and each cage bar touching position are the weakest links, and the welding procedure quality of the mechanical strength of its contact position and cage bar and short-circuited conducting sleeve is closely related.If welding procedure is unreasonable,, in the motor course of work, short-circuited conducting sleeve and cage bar touching position easily snap, Welding Phenomena, cause rotor broken bar, cracking, and motor three-phase current unbalance burns motor when serious.Two cage motor cage bars snap or rupture is all generally from outer cage, as failed, finds in time and processes, and can expand very soon whole rotor to, so that damage whole motor.
In prior art, the rotor cage bar of motor adopts brass or red copper to make.Although red copper, brass all have good conductive capability, the mechanical strength of red copper is lower, and the mechanical strength of brass is high compared with red copper, but when the welding temperature of brass reaches 200～600 ℃, can the serious mechanical strength that reduces brass.In addition, red copper and brass all can not bear large pulling force, and fatigue fracture in use easily occurs.
When short-circuited conducting sleeve and cage bar weld, if the selection of scolder is improper, between cage bar and short-circuited conducting sleeve weld seam calking bad, easily cause and in weld seam, have pore, slag inclusion phenomenon.If welding temperature control is bad, because short-circuited conducting sleeve local heating in welding produces thermal deformation, welds and because cooling contraction causes cage bar, be subject to bending stress afterwards.Due to the difference of every cage bar in welding temperature, the distributed pole of bending stress is inhomogeneous, may cause very high local stress and cause cage bar and short-circuited conducting sleeve to snap.Therefore, how improving the mechanical performance of rotor cage bar and the welding quality of raising rotor cage bar and short-circuited conducting sleeve is problem demanding prompt solution during motor is produced.
Summary of the invention
One object of the present invention is to provide the rotor cage bar of at least one technical problem and the welding method of short-circuited conducting sleeve in a kind of can solving the problems of the technologies described above.
The object of the present invention is to provide the welding method of a kind of rotor cage bar and short-circuited conducting sleeve, according to welding method of the present invention, can guarantee that the weld seam of rotor cage bar and short-circuited conducting sleeve has higher mechanical strength and welding quality.
According to the welding method of a kind of rotor cage bar of the present invention and short-circuited conducting sleeve, rotor cage bar is made by tin-phosphor bronze, short-circuited conducting sleeve is made by red copper, and described welding method comprises the following steps: (a) first end of multiple rotor cage bars and the first short-circuited conducting sleeve are docked to form joint; (b) multiple rotor cage bars and the first short-circuited conducting sleeve are preheated to 150～300 ℃ in heating furnace; (c) adopt oxy-acetylene welding connection, in joint, multiple rotor cage bars are welded on the first short-circuited conducting sleeve; And (d) the first short-circuited conducting sleeve entirety is heated to 350～400 ℃, then slow cooling is to environment temperature.
According to an aspect of the present invention, each in multiple rotor cage bars has cylindrical shape and has chamfering at its first end and the second end, the first short-circuited conducting sleeve has the shape of annular slab and comprises the multiple counterbores recessed from its surface, step (a) comprising: by the first short-circuited conducting sleeve and each docking in the multiple rotor cage bars that are placed vertically with respect to the first short-circuited conducting sleeve, at least a portion of the first end of each rotor cage bar is arranged in corresponding counterbore vertically, to form T junction.
According to an aspect of the present invention, step (c) comprising: utilize silver-base solder and copper Gas welding flux to adopt leftward welding in joint, multiple rotor cage bars to be welded on respectively on the first short-circuited conducting sleeve.
According to an aspect of the present invention, the step of utilizing silver-base solder and copper Gas welding flux to adopt leftward welding in joint, multiple rotor cage bars to be welded on respectively on the first short-circuited conducting sleeve comprises: the first short-circuited conducting sleeve is preheated to 500～600 ℃, and copper Gas welding flux is added to region to be welded; Utilize tip that the region to be welded of multiple rotor cage bars and the first short-circuited conducting sleeve is heated to 750～850 ℃, shroud weld seam with flame envelope, the silver-base solder of having smeared copper Gas welding flux is deep into the root of the chamfering of rotor cage bar, makes the silver-base solder of fusing by rotor cage bar and the fusion of the first short-circuited conducting sleeve; And slightly elongate flame, fill up counterbore and chamfering with solder.
According to an aspect of the present invention, described method also comprises: utilizing silver-base solder and copper Gas welding flux to adopt leftward welding in joint, multiple rotor cage bars to be welded on respectively in the process on the first short-circuited conducting sleeve, the temperature at the position except welding position of the first short-circuited conducting sleeve is remained on to 200～300 ℃.
According to an aspect of the present invention, the first short-circuited conducting sleeve has the shape of annular slab, and step (c) comprising: the circumference of the first short-circuited conducting sleeve is divided into even number circular arc; Weld the first short-circuited conducting sleeve and the rotor cage bar of each circular arc joint; And welding first short-circuited conducting sleeve and the rotor cage bar corresponding with each circular arc.
According to an aspect of the present invention, step (c) comprising: the circumference of the first short-circuited conducting sleeve is divided into the first circular arc, the second circular arc, three-arc and the 4th circular arc along circumferencial direction, arranged successively; Weld the first short-circuited conducting sleeve and the rotor cage bar of the joint of the first circular arc and the 4th circular arc; Weld the first short-circuited conducting sleeve and the rotor cage bar of the joint of the second circular arc and three-arc; Weld the first short-circuited conducting sleeve and the rotor cage bar of the joint of the first circular arc and the second circular arc; Weld the first short-circuited conducting sleeve and the rotor cage bar of the joint of three-arc and the 4th circular arc; Weld first short-circuited conducting sleeve and the rotor cage bar corresponding with the first circular arc; Weld first short-circuited conducting sleeve and the rotor cage bar corresponding with three-arc; Weld first short-circuited conducting sleeve and the rotor cage bar corresponding with the second circular arc; And welding first short-circuited conducting sleeve and the rotor cage bar corresponding with the 4th circular arc.
According to an aspect of the present invention, step (c) comprising: in joint, multiple rotor cage bars are side by side welded on the first short-circuited conducting sleeve.
According to an aspect of the present invention, described method is further comprising the steps of: (e) the second end of multiple rotor cage bars and the second short-circuited conducting sleeve are docked to form joint; (f) multiple rotor cage bars and the second short-circuited conducting sleeve are preheated to 150～300 ℃ in heating furnace; (g) adopt oxy-acetylene welding connection, in joint, multiple rotor cage bars are welded on the second short-circuited conducting sleeve; And (h) the second short-circuited conducting sleeve entirety is heated to 350～400 ℃, then slow cooling is to environment temperature.
According to an aspect of the present invention, wherein, execution step (a) and (e) simultaneously, execution step (b) and (f) simultaneously performs step (c) and (g) simultaneously, performs step (d) and (h) simultaneously.
According to the present invention, the weld seam that can guarantee rotor cage bar and short-circuited conducting sleeve has higher mechanical strength and welding quality, without defects such as undercut, crackle, lack of penetration, incomplete fusion, slag inclusion and pores, the compactness of welding point is good, rotor can move 5-10, and the weld zone of rotor cage bar and short-circuited conducting sleeve does not snap.
Accompanying drawing explanation
By the detailed description of carrying out below in conjunction with accompanying drawing, above and other objects of the present invention, feature and advantage will become apparent, wherein:
Fig. 1 shows end according to an exemplary embodiment of the present invention and has the perspective view of the rotor cage bar of chamfering;
Fig. 2 shows according to the cutaway view of the rotor cage bar intercepting along A-A line in Fig. 1 of exemplary embodiment of the present invention;
Fig. 3 shows the cutaway view of the short-circuited conducting sleeve according to an exemplary embodiment of the present invention with recessed counterbore downwards;
Fig. 4 shows the schematic diagram that rotor cage bar docks with the short-circuited conducting sleeve shown in Fig. 3 according to an exemplary embodiment of the present invention;
Fig. 5 shows the welding sequence figure in the welding process of the short-circuited conducting sleeve shown in Fig. 4 and rotor cage bar according to an exemplary embodiment of the present invention.
The explanation of main Reference numeral:
10. short-circuited conducting sleeve, 11. counterbores, 20. rotor cage bars, 21. chamferings, 1. the first circular arc, 2. the second circular arc, 3. three-arc, 4. the 4th circular arc.
The specific embodiment
Hereinafter, exemplary embodiment of the present invention is described with reference to the accompanying drawings more fully.But they can be implemented with different forms, and should not be construed as the embodiment that is confined to set forth here.On the contrary, providing these embodiment to make the disclosure will be thoroughly with complete, and the scope of example embodiment will be conveyed to those skilled in the art fully.
Hereinafter, will describe according to the welding method of the rotor cage bar of exemplary embodiment of the present invention and short-circuited conducting sleeve.
A kind of rotor cage bar providing according to an exemplary embodiment of the present and the welding method of short-circuited conducting sleeve comprise the following steps: (1) docks to form joint by the end of multiple rotor cage bars of being made by tin-phosphor bronze and the short-circuited conducting sleeve made by red copper; (2) multiple rotor cage bars and short-circuited conducting sleeve are preheated to 150～300 ℃ in heating furnace; (3) adopt oxy-acetylene welding connection, in joint, multiple rotor cage bars are welded on short-circuited conducting sleeve; (4) short-circuited conducting sleeve after welding is heated to 350～400 ℃, then slow cooling is to environment temperature.
Fig. 1 shows end according to an exemplary embodiment of the present invention and has the perspective view of the rotor cage bar 20 of chamfering 21, and Fig. 2 shows according to the cutaway view of the rotor cage bar 20 intercepting along A-A line in Fig. 1 of exemplary embodiment of the present invention.See figures.1.and.2, motor rotor cage bar 20 has cylindrical shape on the whole.Rotor cage bar 20 is made by QSn7-0.2 tin-phosphor bronze.In one embodiment, adopt extrusion process to manufacture rotor cage bar 20 by QSn7-0.2 tin-phosphor bronze.The smooth surface of the rotor cage bar 20 of producing by extrusion process, without defects such as scratch, buildups.Although illustrated in Fig. 1 that rotor cage bar 20 has cylindrical shape, rotor cage bar can also other shape known to those skilled in the art.
For the manufacture of the QSn7-0.2 tin-phosphor bronze of rotor cage bar 20 can comprise by weight percentage Zn, the 0.001～0.002wt% of Ni, the 0.06～0.09wt% of Fe, the 0.002～0.004wt% of Pb, the 0.005～0.008wt% of P, the 0.008～0.01wt% of Sn, the 0.15～0.25wt% of Cu, the 6.25～7.25wt% of 92.5～93.5wt% Bi, be less than 0.001wt% Si, be less than 0.0002wt% Mg, be less than 0.0004wt% As, be less than 0.0015wt% Sb, be less than 0.0002wt% Al, be less than the S of 0.0002wt%, and inevitable impurity.Preferably, for the manufacture of the QSn7-0.2 tin-phosphor bronze of rotor cage bar 20 can comprise by weight percentage Zn, the 0.0017wt% of Ni, the 0.06～0.09wt% of Fe, the 0.002～0.004wt% of Pb, the 0.005～0.008wt% of P, the 0.008～0.01wt% of Sn, the 0.18wt% of Cu, the 6.61wt% of 93.1wt% Bi, be less than 0.001wt% Si, be less than 0.0002wt% Mg, be less than 0.0004wt% As, be less than 0.0015wt% Sb, be less than 0.0002wt% Al, be less than the S of 0.0002wt%, and inevitable impurity.
According to one embodiment of present invention, the resistivity of QSn7-0.2 tin-phosphor bronze in the time of 20 ℃ is 0.12～0.16 μ Ω m.Although the resistivity of QSn7-0.2 tin-phosphor bronze is high compared with the resistivity of brass and red copper, the electric conductivity of QSn7-0.2 tin-phosphor bronze can meet the requirement to cage bar electric conductivity completely.
According to one embodiment of present invention, the room-temperature mechanical property of QSn7-0.2 tin-phosphor bronze is: tensile strength>=440MPa, percentage elongation is 15～25%, impact flexibility>=70J/cm
2, yield strength is 250～300MPa, Brinell hardness is 120～150HB.
According to exemplary embodiment of the present invention, the draw ratio of rotor cage bar 20 can be for example 20～100, and the length of rotor cage bar 20 can be for example 500～2000mm.But, the invention is not restricted to this, rotor cage bar 20 can have the draw ratio of other any appropriate known to those skilled in the art and the length of other any appropriate.
See figures.1.and.2, rotor cage bar 20 has the chamfering 21 in left part and right part, so that rotor cage bar 20 is welded on to (as described later) on short-circuited conducting sleeve 10.The number of degrees of chamfering 21 can be 25 °～30 °, but the invention is not restricted to this, and the number of degrees of chamfering can be to be convenient to the end of rotor cage bar 20 to be welded on short-circuited conducting sleeve and any suitable angle that adopts.The degree of depth of chamfering 21 can be greater than rotor cage bar 20 radius 2/3rds.The existence of chamfering 21 makes it possible to easily the end of rotor cage bar 20 to be arranged in the counterbore 11 of short-circuited conducting sleeve 10.
Fig. 3 shows the cutaway view of the short-circuited conducting sleeve 10 according to an exemplary embodiment of the present invention with recessed counterbore 11 downwards, Fig. 4 shows the schematic diagram that rotor cage bar 20 docks with the short-circuited conducting sleeve 10 shown in Fig. 3 according to an exemplary embodiment of the present invention, and Fig. 5 shows according to an exemplary embodiment of the present invention the welding sequence figure in the welding process of the short-circuited conducting sleeve 10 shown in Fig. 4 and rotor cage bar 20.With reference to Fig. 3 to Fig. 5, short-circuited conducting sleeve 10 has the shape of annular slab.Multiple rotor cage bars 20 will be welded on short-circuited conducting sleeve 10 along the circumferencial direction of short-circuited conducting sleeve 10.The position that will weld with rotor cage bar 20 of short-circuited conducting sleeve 10 is uniformly distributed along the circumferencial direction of short-circuited conducting sleeve 10, and from cutaway view, the outside of these welding positions more close short-circuited conducting sleeve 10 on the radial direction of short-circuited conducting sleeve 10.At place, welding position, short-circuited conducting sleeve 10 has the counterbore 11 recessed from its surface, and at least a portion (for example, the end that comprises chamfering 21 of rotor cage bar 20) of the end of rotor cage bar 20 will be arranged in counterbore 11.Therefore, multiple counterbores 11 are uniformly distributed along the circumferencial direction of short-circuited conducting sleeve 10.
First, with reference to Fig. 4, short-circuited conducting sleeve 10 is docked with the rotor cage bar 20 being placed vertically with respect to short-circuited conducting sleeve 10, make rotor cage bar 20 end at least a portion (for example, the end that comprises chamfering 21 of rotor cage bar 20) be arranged on vertically in the counterbore 11 of short-circuited conducting sleeve 10, to form T junction.
The existence of chamfering 21 makes it possible to easily the end of rotor cage bar 20 to be arranged in the counterbore 11 of short-circuited conducting sleeve 10.In addition, in follow-up welding process, in counterbore 11, can form artificial molten bath, avoid the loss of scolder, guarantee the welding quality of joint.
Although the mated condition of a rotor cage bar 20 and short-circuited conducting sleeve 10 has been shown in Fig. 4, along the circumferencial direction of short-circuited conducting sleeve 10, multiple rotor cage bars 20 has been docked according to state as shown in Figure 4 with short-circuited conducting sleeve 10.Selectively, except the circumferencial direction along short-circuited conducting sleeve 10 docks with short-circuited conducting sleeve 10 end of multiple rotor cage bars 20 according to state as shown in Figure 4, also along the circumferencial direction of another short-circuited conducting sleeve (this short-circuited conducting sleeve can be identical with short-circuited conducting sleeve 10), another short-circuited conducting sleeve of the other end and this of multiple rotor cage bars 20 is docked according to state as shown in Figure 4, in this case, parallel multiple rotor cage bars dock with two short-circuited conducting sleeves at two ends, thereby form an entirety, so that clamp or shift this entirety, thereby be conducive to the processing of subsequent handling.
Then, by the rotor cage bar to connecting 20 and short-circuited conducting sleeve 10(for example, multiple rotor cage bars 20 and the short-circuited conducting sleeve 10 docking with one end of multiple rotor cage bars 20, or multiple rotor cage bar 20 and two short-circuited conducting sleeves 10 docking with the two ends of multiple rotor cage bars 20 respectively) in heating furnace, be preheated to 150～300 ℃.Pre-heat energy slows down the cooling velocity of postwelding, is conducive to the effusion of diffusible hydrogen in weld metal, avoids producing hydrogen induced cracking, and preheating also can reduce welding stress.If preheat temperature is lower than 150 ℃, the DeGrain of preheating, can not effectively reduce welding stress; And if preheat temperature is higher than 300 ℃, rotor cage bar starts oxidation.
Then, adopt oxy-acetylene welding connection, in joint, rotor cage bar 20 is welded on short-circuited conducting sleeve 10.According to one embodiment of present invention, the solder adopting during welding comprises silver-base solder, and the solder flux adopting during welding comprises copper Gas welding flux.Preferably, silver-base solder can be L303 silver-base solder, and it can have the diameter of 3mm, and the fusing point of L303 silver-base solder is between 660～725 ℃, and silver content is 45%, has good mobility and joint filling, brazed seam any surface finish, and strength of joint is high, shock-resistant.Preferably, copper Gas welding flux can be CJ301 copper Gas welding flux, and the fusing point of CJ301 copper Gas welding flux is 650 ℃.Can, by clean L303 silver-base solder surface clean, then CJ301 copper Gas welding flux be spread upon on L303 silver-base solder to then welding.
According to one embodiment of present invention, adopt leftward welding to weld short-circuited conducting sleeve 10 and rotor cage bar 20.The welding wire (for example, having smeared the solder of flux) of leftward welding is before welding torch, and flame points to workpiece part to be welded, and both move to left end from weld seam right-hand member simultaneously.When adopting leftward welding, can obtain height and the uniform weld seam of width; In addition,, due to the not weldering part of welding flame sensing weldment, therefore also metal has been played the effect of preheating.
According to one embodiment of present invention, utilize tip (for example, with the supporting H01-12-4 tip of H01-12 welding gun) that short-circuited conducting sleeve 10 is preheated to 500～600 ℃, and a certain amount of flux is added to region to be welded.Flux can play protection and wetting effect to weld zone.According to one embodiment of present invention, the gas flow that utilizes oxy-acetylene gas to carry out preheating to short-circuited conducting sleeve 10 is 14～16L/min.Then, utilize tip (for example, with the supporting H01-12-2 tip of H01-12 welding gun) that rotor cage bar 20 and short-circuited conducting sleeve 10 are heated to 750～850 ℃ and weld, wherein, tip angle and short-circuited conducting sleeve 10 are 45 ° of left and right.According to one embodiment of present invention, the gas flow that utilizes oxy-acetylene gas to carry out weld heating to rotor cage bar 20 and short-circuited conducting sleeve 10 is 10～12L/min.If oxy-acetylene gas flow is too large, easily cause turbulent flow, the impurity such as oxygen are blown in weld seam; If oxy-acetylene gas flow is too little,, because the bad air that causes of protection effect enters weld seam, cause the scaling loss of pore, alloying element etc.
Oxy-acetylene flame envelope is shrouded to weld seam all the time, utilize oxyacetylene neutral flame to heat.Rotor cage bar 20 and short-circuited conducting sleeve 10 are heated to after 750～850 ℃, the solder that solder has for example been smeared to flux is deep into the root of the chamfering 21 of rotor cage bar 20, utilize oxyacetylene internal flame that solder is melted, the solder of fusing fully fuses rotor cage bar 20 and short-circuited conducting sleeve 10, then slightly elongate flame, fill up counterbore 11 and chamfering 21 with scolder.According to one embodiment of present invention, solder and short-circuited conducting sleeve 10 are 25 °～30 °.
In when welding, rotor cage bar 20 and short-circuited conducting sleeve 10 heats equably, movable flame and send solder to weld seam, edge swing puts in place.When welding, should there is not incomplete fusion, undercut, defects i.e.cracks.
According to one embodiment of present invention, the circumference of short-circuited conducting sleeve 10 is divided into even number circular arc, preferably, for example 4,6,8,10,12,14,16 circular arcs.Then, according to above-mentioned method, weld short-circuited conducting sleeve and the rotor cage bar 20 of each circular arc joint.In the case of for example the circumference of short-circuited conducting sleeve 10 being divided into 2n(n, be greater than 1 integer) individual circular arc to multiple circular arcs and joint number consecutively, can first weld short-circuited conducting sleeve and the rotor cage bar of the 1st joint in 2n joint, then short-circuited conducting sleeve and the rotor cage bar of welding and the 1st centrosymmetric n+1 joint, joint, then weld short-circuited conducting sleeve and the rotor cage bar of the 2nd joint adjacent with the 1st joint, then short-circuited conducting sleeve and the rotor cage bar of welding and the 2nd centrosymmetric n+2 joint, joint, with such order, carry out, until welded short-circuited conducting sleeve and the rotor cage bar of all joints.But, the invention is not restricted to this, in the case of for example the circumference of short-circuited conducting sleeve 10 being divided into 2n(n, be greater than 1 integer) individual circular arc to multiple circular arcs and joint number consecutively, can first weld short-circuited conducting sleeve and the rotor cage bar of the 1st joint in 2n joint, then short-circuited conducting sleeve and the rotor cage bar of welding and the 1st centrosymmetric n+1 joint, joint, then welding and the 1st non-conterminous i joint, joint are (for example, i joint is positioned at the mid point of the 1st joint and n+1 joint) short-circuited conducting sleeve and rotor cage bar, then short-circuited conducting sleeve and the rotor cage bar of welding and centrosymmetric n+i joint, i joint, then weld short-circuited conducting sleeve and the rotor cage bar of the midpoint between the 1st joint and i joint, then welding and this midpoint centrosymmetric joint short-circuited conducting sleeve and rotor cage bar, with such order, carry out, until welded short-circuited conducting sleeve and the rotor cage bar of all joints.Can be according to short-circuited conducting sleeve and the rotor cage bar of any suitable order welding joint, as long as can guarantee enough concentricitys and levelness.
Then, welding short-circuited conducting sleeve 10 and the rotor cage bar 20 corresponding with each circular arc.In the case of for example the circumference of short-circuited conducting sleeve 10 being divided into 2n(n, be greater than 1 integer) individual circular arc to multiple circular arc number consecutivelies, can first weld short-circuited conducting sleeve and the rotor cage bar at the 1st circular arc place in 2n circular arc, then short-circuited conducting sleeve and the rotor cage bar at the n+1 circular arc place of welding and the 1st center of arc's symmetry, then weld short-circuited conducting sleeve and the rotor cage bar at the 2nd circular arc place adjacent with the 1st circular arc, then short-circuited conducting sleeve and the rotor cage bar at the n+2 circular arc place of welding and the 2nd center of arc's symmetry, with such order, carry out, until welded short-circuited conducting sleeve and the rotor cage bar of all joints.But, the invention is not restricted to this, in the case of for example the circumference of short-circuited conducting sleeve 10 being divided into 2n(n, be greater than 1 integer) individual circular arc to multiple circular arc number consecutivelies, can first weld short-circuited conducting sleeve and the rotor cage bar at the 1st circular arc place in 2n circular arc, then short-circuited conducting sleeve and the rotor cage bar at the n+1 circular arc place of welding and the 1st center of arc's symmetry, then welding and the non-conterminous i circular arc of the 1st circular arc place are (for example, i circular arc is positioned at the mid point of the 1st circular arc and n+1 circular arc) short-circuited conducting sleeve and rotor cage bar, then short-circuited conducting sleeve and the rotor cage bar at the n+i circular arc place of welding and i center of arc symmetry, then weld short-circuited conducting sleeve and the rotor cage bar of the circular arc of the midpoint between the 1st circular arc and i circular arc, then short-circuited conducting sleeve and the rotor cage bar of the circular arc of center of arc's symmetry of welding and this midpoint, with such order, carry out, until welded the short-circuited conducting sleeve corresponding with all circular arcs and rotor cage bar.Can be according to any suitable order welding short-circuited conducting sleeve and rotor cage bar corresponding with each circular arc, as long as can guarantee enough concentricitys and levelness.
For example, with reference to Fig. 5, the circumference of short-circuited conducting sleeve 10 is divided into four circular arcs, the first circular arc 1, the second circular arc 2, three-arc 3 and the 4th circular arc 4 along clockwise circumferencial direction, arranged successively.First, weld short-circuited conducting sleeve 10 and the rotor cage bar 20 of the joint of the first circular arc 1 and the 4th circular arc 4, then weld short-circuited conducting sleeve 10 and the rotor cage bar 20 of the joint of the second circular arc 2 and three-arc 3, then the short-circuited conducting sleeve 10 and the rotor cage bar 20 that weld the joint of the first circular arc 1 and the second circular arc 2, then weld short-circuited conducting sleeve 10 and the rotor cage bar 20 of the joint of three-arc 3 and the 4th circular arc 4.Then, weld short-circuited conducting sleeve 10 and the rotor cage bar 20 corresponding with the first circular arc 1, then welding short-circuited conducting sleeve 10 and the rotor cage bar 20 corresponding with three-arc 3, then welding short-circuited conducting sleeve 10 and the rotor cage bar 20 corresponding with the second circular arc 2, then welding short-circuited conducting sleeve 10 and the rotor cage bar 20 corresponding with the 4th circular arc 4.
When the short-circuited conducting sleeve 10 to each joint and rotor cage bar 20 and the short-circuited conducting sleeve 10 corresponding with each circular arc and multiple rotor cage bar 20 weld, can adopt above-described oxy-acetylene welding connection.In addition, when the short-circuited conducting sleeve 10 to corresponding with each circular arc and multiple rotor cage bar 20 weld, can be from one end of circular arc along clockwise or counterclockwise weld successively multiple rotor cage bars 20 and short-circuited conducting sleeve 10.
Although described the welding procedure of short-circuited conducting sleeve 10 with multiple rotor cage bars 20 above, the invention is not restricted to this.In one exemplary embodiment, each in solder shorts ring 10 and multiple rotor cage bars 20 simultaneously.
When solder shorts ring 10 and multiple rotor cage bar 20, the temperature of short-circuited conducting sleeve 10 can be remained in the scope of 200～300 ℃, this contributes to obtain less welding residual stress.
After having welded multiple rotor cage bars 20 and a short-circuited conducting sleeve 10, this short-circuited conducting sleeve 10 after welding is heated to 350～400 ℃, then adopt such as slow cooling in the insulation material parcel short-circuited conducting sleeve 10 of asbestos or stove and, to the environment temperature such as room temperature, with this, to welding rear short-circuited conducting sleeve 10, carry out annealing in process.In welding process, due to the inhomogeneities of heating and cooling, and contained or additional the restraining of weldment generation itself, after welding job finishes, in weldment, always produce welding stress, therefore need the welding position between short-circuited conducting sleeve 10(especially short-circuited conducting sleeve 10 and rotor cage bar 20) carry out annealing in process to eliminate postwelding internal stress.
Then, can to the other end of multiple rotor cage bars 20 and another short-circuited conducting sleeve 10, weld according to above-described method, not repeat them here.Although described the one end and the short-circuited conducting sleeve 10 that first weld multiple rotor cage bars 20 here, then weld the other end and another short-circuited conducting sleeve 10 of the plurality of rotor cage bar 20, the invention is not restricted to this.In one exemplary embodiment, one end of multiple rotor cage bars 20 and the other end can side by side be welded to respectively two short-circuited conducting sleeves 10.
After welding completes, the welding position of rotor cage bar 20 and short-circuited conducting sleeve 10 is carried out to outward appearance verification and painted verification, it is qualified that the flawless defect in welding position is.But, the invention is not restricted to this.In one exemplary embodiment, can omit the step of outward appearance verification and painted verification.
Then, the short-circuited conducting sleeve welding together 10 and rotor cage bar 20 are carried out to welding stress Processing for removing.In one exemplary embodiment, can adopt lash method or hammering method to carry out welding stress Processing for removing.
According to the welding method of rotor cage bar of the present invention and short-circuited conducting sleeve, suitable scolder and rational welding method and temperature have been selected, the weld seam that can guarantee rotor cage bar and short-circuited conducting sleeve has higher mechanical strength and welding quality, without defects such as undercut, crackle, lack of penetration, incomplete fusion, slag inclusion and pores, the compactness of welding point is good, rotor can move 5-10, and the weld zone of rotor cage bar and short-circuited conducting sleeve does not snap.
Although described some embodiments of the present invention with reference to the accompanying drawings, it should be appreciated by those skilled in the art that in the case of not departing from by claim and equivalent thereof and limit the principle of the present invention and spirit of its scope, can modify to these embodiment.
Claims (10)
1. a welding method for rotor cage bar and short-circuited conducting sleeve, rotor cage bar is made by tin-phosphor bronze, and short-circuited conducting sleeve is made by red copper, it is characterized in that said method comprising the steps of:
(a) first end of multiple rotor cage bars and the first short-circuited conducting sleeve are docked to form joint;
(b) multiple rotor cage bars and the first short-circuited conducting sleeve are preheated to 150～300 ℃ in heating furnace;
(c) adopt oxy-acetylene welding connection, in joint, multiple rotor cage bars are welded on the first short-circuited conducting sleeve; And
(d) the first short-circuited conducting sleeve entirety is heated to 350～400 ℃, then slow cooling is to environment temperature.
2. welding method according to claim 1, it is characterized in that, each in multiple rotor cage bars has cylindrical shape and has chamfering at its first end and the second end, and the first short-circuited conducting sleeve has the shape of annular slab and comprises the multiple counterbores recessed from its surface
Step (a) comprising: by the first short-circuited conducting sleeve and each docking in the multiple rotor cage bars that are placed vertically with respect to the first short-circuited conducting sleeve, at least a portion of the first end of each rotor cage bar is arranged in corresponding counterbore vertically, to form T junction.
3. welding method according to claim 2, is characterized in that, step (c) comprising: utilize silver-base solder and copper Gas welding flux to adopt leftward welding in joint, multiple rotor cage bars to be welded on respectively on the first short-circuited conducting sleeve.
4. welding method according to claim 3, is characterized in that, the step of utilizing silver-base solder and copper Gas welding flux to adopt leftward welding in joint, multiple rotor cage bars to be welded on respectively on the first short-circuited conducting sleeve comprises:
The first short-circuited conducting sleeve is preheated to 500～600 ℃, and copper Gas welding flux is added to region to be welded;
Utilize tip that the region to be welded of multiple rotor cage bars and the first short-circuited conducting sleeve is heated to 750～850 ℃, shroud weld seam with flame envelope, the silver-base solder of having smeared copper Gas welding flux is deep into the root of the chamfering of rotor cage bar, makes the silver-base solder of fusing by rotor cage bar and the fusion of the first short-circuited conducting sleeve; And
The slight flame that elongates, fills up counterbore and chamfering with solder.
5. welding method according to claim 4, it is characterized in that described method also comprises: utilizing silver-base solder and copper Gas welding flux to adopt leftward welding in joint, multiple rotor cage bars to be welded on respectively in the process on the first short-circuited conducting sleeve, the temperature at the position except welding position of the first short-circuited conducting sleeve is remained on to 200～300 ℃.
6. method according to claim 1, is characterized in that, the first short-circuited conducting sleeve has the shape of annular slab, and step (c) comprising:
The circumference of the first short-circuited conducting sleeve is divided into even number circular arc;
Weld the first short-circuited conducting sleeve and the rotor cage bar of each circular arc joint; And
Weld first short-circuited conducting sleeve and the rotor cage bar corresponding with each circular arc.
7. method according to claim 6, is characterized in that, step (c) comprising:
The circumference of the first short-circuited conducting sleeve is divided into the first circular arc, the second circular arc, three-arc and the 4th circular arc along circumferencial direction, arranged successively;
Weld the first short-circuited conducting sleeve and the rotor cage bar of the joint of the first circular arc and the 4th circular arc;
Weld the first short-circuited conducting sleeve and the rotor cage bar of the joint of the second circular arc and three-arc;
Weld the first short-circuited conducting sleeve and the rotor cage bar of the joint of the first circular arc and the second circular arc;
Weld the first short-circuited conducting sleeve and the rotor cage bar of the joint of three-arc and the 4th circular arc;
Weld first short-circuited conducting sleeve and the rotor cage bar corresponding with the first circular arc;
Weld first short-circuited conducting sleeve and the rotor cage bar corresponding with three-arc;
Weld first short-circuited conducting sleeve and the rotor cage bar corresponding with the second circular arc; And
Weld first short-circuited conducting sleeve and the rotor cage bar corresponding with the 4th circular arc.
8. method according to claim 1, is characterized in that, step (c) comprising: in joint, multiple rotor cage bars are side by side welded on the first short-circuited conducting sleeve.
9. method according to claim 1, is characterized in that described method is further comprising the steps of:
(e) the second end of multiple rotor cage bars and the second short-circuited conducting sleeve are docked to form joint;
(f) multiple rotor cage bars and the second short-circuited conducting sleeve are preheated to 150～300 ℃ in heating furnace;
(g) adopt oxy-acetylene welding connection, in joint, multiple rotor cage bars are welded on the second short-circuited conducting sleeve; And
(h) the second short-circuited conducting sleeve entirety is heated to 350～400 ℃, then slow cooling is to environment temperature.
10. method according to claim 9, wherein, execution step (a) and (e) simultaneously, execution step (b) and (f) simultaneously performs step (c) and (g) simultaneously, performs step (d) and (h) simultaneously.
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| CN201310752068.0A CN103722269B (en) | 2013-12-31 | 2013-12-31 | The welding method of rotor cage bar and short-circuited conducting sleeve |
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| CN1182970A (en) * | 1996-11-15 | 1998-05-27 | 三菱电机株式会社 | Rotor of squirrel-cage induction motor and making method |
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| CN1182970A (en) * | 1996-11-15 | 1998-05-27 | 三菱电机株式会社 | Rotor of squirrel-cage induction motor and making method |
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