CN101394120A

CN101394120A - Stirring friction welding method and device for end ring and guide strip of motor rotor

Info

Publication number: CN101394120A
Application number: CNA2008101434981A
Authority: CN
Inventors: 李再华; 张越雷; 徐勤文; 陈雷; 左志远
Original assignee: Xiangtan Electric Manufacturing Co Ltd
Current assignee: Xiangtan Electric Manufacturing Co Ltd; Central South University
Priority date: 2008-11-05
Filing date: 2008-11-05
Publication date: 2009-03-25

Abstract

The invention relates to a friction stir welding method and equipment thereof for an electrical motor rotor end ring and a conducting bar. The welding method comprises the following steps: an ion core is hit and tightly wedged into the conductive bar, and one end face of the end ring and the end face flat end of the conductive bar are in the same plane; a stirring head is pressed into the joint of the end ring and the conductive bar in a cold state, and the stirring head rotates at high speed and move along the contact surface of the end ring and the conductive bar; the friction stir welding direction is from the inner part of the end ring to the outer part of the end ring or from the outer part of the end ring to the inner part of the end ring; and the shaft shoulder of the stirring head with high rotating speed and the contact surface of the end ring plane and the end face of the conductive bar are contacted with each other and generate heat by friction, so that the part temperature of the end ring and the conductive bar reaches the fusion temperature, and the end ring and the contact surface of the conductive bar are fused together. The invention also comprises the relative equipment. Through the adoption of the invention, the electrical motor rotor end ring and the conducting bar be welded to achieve low welding line resistance rate, high welding tension strength and low welding cost because welding material is not required.

Description

The friction stir welding method of motor rotor end ring and sliver and equipment

Technical field

The present invention relates to the friction stir welding method and the equipment of a kind of motor rotor end ring and sliver, specifically, relate to the copper on a kind of rotor and the method and apparatus of copper alloy end ring and sliver.

Background technology

In the motor manufacturing, the end ring of rotor and sliver welding method at present, mainly contain two kinds: the one, and manual gas welding, welding material adopts better conductivity materials such as HL204 or HL303; The 2nd, medium frequency inductive brazing, welding material also are to adopt better conductivity materials such as HL204 or HL303.In above-mentioned welding method, the resistivity of used welding material is bigger with respect to copper and copper alloy mother metal.For example, the resistivity of red copper end ring is 1.77, and adopt HL204 or HL303 to weld sliver, the resistivity of weld seam reaches respectively about 20 and 8, is several times of mother metal, and such weld seam resistivity is after rotor passes through big electric current, the resistance heat of commissure can be several times of mother metal, like this, the temperature that can cause rotor significantly raises rapidly, causes a part of electrical power of motor to change heat into and loses.

From the soldering situation of present motor rotor end ring and sliver, the weld seam position often some micro-cracks or spilehole can occur, and the tensile strength of weld seam has only about 60% of copper and copper alloy mother metal.

Moreover welding material consumption is also more.From present common situation, the end ring and the sliver that are 500mm with a diameter weld together, and need to consume about solder 4kg, by 3000 yuan of/kilogram calculating of average price of existing silver-base solder, with the sliver and the end ring welding of a rotor, need the welding material expense of 12000 yuan of costs.

Summary of the invention

The objective of the invention is to overcome the defective that prior art exists, provide a kind of weld seam resistivity low, the tensile strength height of weld seam, and do not need welding material, the method and apparatus of the motor rotor end ring that welding cost is low and the friction Stir of sliver.

Technical scheme of the present invention is:

The present invention's the rotor end ring and the friction stir welding method of sliver are: before the welding sliver is squeezed into iron core and wedging, one end face of end ring and the end face tack of sliver are at grade, stirring-head is pushed down into the joint of end ring and sliver in cold conditions, the stirring-head high speed rotating also moves along the contact-making surface of end ring and sliver, the friction Stir direction be from the inside of end ring to outside or from the outside of end ring to inner friction Stir, the shaft shoulder of the stirring-head by high speed rotating contacts with the end face of sliver and frictional heat with the end ring plane, make the local temperature of end ring and sliver reach fusion temperature, the contact-making surface of end ring and sliver fuses into one.

The local fusing temperature of described end ring and sliver should reach 500 ℃--and 700 ℃.

For improving the tensile strength of weld seam, a sliver should carry out 2 welding.

The special equipment of the friction stir welding method of described motor rotor end ring of the present invention's realization and sliver comprises a motion platform, one end of described motion platform is fixed with column, the rotor rotating mechanism is installed on the guide rail of motion platform, in the described rotor rotating mechanism anchor clamps that are used for fixing rotor are installed, be fixed with crossbeam on the column guide rail, the stirring welding head of band stirring-head is installed on the guide rail of crossbeam, and stirring-head is installed in and stirs in the welding head.

Effect of the present invention: make the contact-making surface agitating friction of end ring and sliver produce high temperature by stirring-head, and fuse into one, both reduced the resistivity of weld seam, reduce electrical piano power loss; Can improve the tensile strength of weld seam again, copper and copper alloy weld seam tensile strength can reach more than 80% of mother metal, and the fail safe of rotor has been added one deck insurance again; And the welding material consumption when having saved welding, reduce welding cost.

Description of drawings

Fig. 1 is the structural representation of present device one embodiment.

Fig. 2 is a left view embodiment illustrated in fig. 1.

Fig. 3 is a workpiece signal right view embodiment illustrated in fig. 1.

Fig. 4 is a workpiece schematic front view embodiment illustrated in fig. 1.

Fig. 5 is the partial enlarged drawing of 1-1 shown in Figure 3.

Fig. 6 is the left view of the partial enlarged drawing of 1-1 shown in Figure 5.

Fig. 7 is the inventive method welding starting point schematic diagram.

Fig. 8 is the inventive method welding end of a period point schematic diagram.

Fig. 9 is the inventive method welding lockhole schematic diagram.

Figure 10 is the inventive method postwelding end plate and sliver connection diagram.

Among the figure: 1. motion platform; 2. rotor rotating mechanism; 3. rotor clamper; 4. stirring welding head; 5. crossbeam; 6. column; 7. sliver; 8. end ring; 9. iron core; 10. motor shaft; 11. welding starting point; 12. welding end of a period point; 13. stirring-head; 14. stirring weld seam; 15. stirring-head lockhole; 16. rotor.

Embodiment

Below in conjunction with drawings and Examples the present invention is described in further detail.

See figures.1.and.2, present device embodiment comprises a motion platform 1, one end of described motion platform 1 is fixed with column 6, rotor rotating mechanism 2 is installed on the guide rail of motion platform 1, the rotor clamper 3 that is used for fixing rotor is installed in the described rotor rotating mechanism 2, be fixed with crossbeam 5 on column 6 guide rails, the stirring welding head 4 of band stirring-head 13 is installed on the guide rail of crossbeam 5, stirring-head 13 is installed in and stirs in the welding head 4.

Column 6 (2, as shown in Figure 2, about each one) fix on the ground; Crossbeam 5 can move up and down with respect to column 6 on column 6; But motion platform 1 is with respect to column 6 move left and right; During welding, rotor 16 is fixed in the rotor clamper 3, drives it by rotor rotating mechanism 2 and rotates to finish welding along rotor 16 centers; The main shaft self that stirs welding head 4 can move up and down, and the stirring-head of installing on it 13 can be made high speed rotary motion to finish welding under the drive of main shaft, and stirring welding head 4 self can be along crossbeam 5 side-to-side movement.

With reference to Fig. 2, Fig. 3 and Fig. 4, after the sliver 7 of rotor 16 is fixed on the iron core 9 and and end ring 8 assemble, rotor 16 just can carry out friction Stir.

Referring to figs. 1 through Figure 10, welding process begins, the stirring-head 13 that stirs on the welding head 4 is found welding starting point 11 on sliver 7 and the end ring 8 accurately, stirring-head 13 is made the joint that high speed self rotatablely moves and is pressed into sliver 7 and end ring 8, it is sliver 7 one with end ring 8 melting welding that the stirring shaft shoulder on the stirring welding head 4 and end ring 8 and sliver 7 violent frictions produce frictional heats, stir welding head 4 and on crossbeam 5, move to welding end of a period point 12, finish a weld seam shown in Figure 8; Rotor 16 and rotor anchor clamps 3 rotate corresponding angle under the effect of rotor rotating mechanism 2, stirring-head 13 on the stirring welding head 4 is found the welding starting point 11 on second sliver 7 and end ring 8 weld seams accurately, stirring-head 13 is made the joint that high speed self rotatablely moves and is pressed into sliver 7 and end ring 8, stirring welding head 3 moves on crossbeam 5, finish second weld seam shown in Figure 8, rotor rotating mechanism 2 rotates article one weld seam that corresponding angle is finished second sliver 7 once more, as follows analogize, finish the welding of last root sliver 7.Rotor 16 is hung out rotor anchor clamps 3 and Vehicle Processing end ring 8 planes and car go all lockholes, so just finished the welding of 16 1 end ring 8 of rotor, finish the welding of an other end ring 8 with identical method to the figure paper size.

With reference to Fig. 3 and Fig. 4, owing to will carry out friction welding, so the end face that requires end face of end ring 8 and sliver 7 at grade.

With reference to Fig. 5, a sliver 7 carries out 2 welding shown in Figure 5, promptly illustrates 1 and 2 two weld seam.Welding direction is that inside from end ring 8 is to outside weldings.Also can be from the outside of end ring 8 to interior welds.

Fig. 5 to Fig. 9 has explained the overall process of a weld seam from beginning to finish.

With reference to Fig. 6, the stirring-head 13 of high speed rotating is pushed down into the joint (as can be seen from Figure 5 being pressed into position a little) of end ring 8 and sliver 7, the shaft shoulder of stirring-head 13 and end ring 8 and sliver 7 plane contact and frictional heat in cold conditions; Under the effect of frictional heat, end ring 8 reaches welding temperature (500 ℃-700 ℃) with the local temperature of sliver 7.

With reference to Fig. 7, stirring-head 13 beginnings are moved along the end ring 8 and the composition surface of sliver 7; Stir end ring 8 and sliver 7 and form weld seam.

With reference to Fig. 8 and Fig. 9, stirring-head 13 arrives the formation of welding end of a period point and stirs weld seam 14; Welding ends, and stirring-head 13 is extracted from end ring 8 the insides and formed the situation of stirring-head lockhole 15.

With reference to Fig. 9 and Figure 10, finish weld seams all on the end ring after, the situation after all slivers 7 and the good back of end ring 8 welding stirring-head lockhole 15 (shown in Figure 9) are got rid of in Vehicle Processing also is the end ring 8 and sliver 7 weld seam schematic diagrames that reaches designing requirement at last.

Claims

1, the friction stir welding method of a kind of motor rotor end ring and sliver, it is characterized in that, before the welding sliver is squeezed into iron core and wedging, one end face of end ring and the end face tack of sliver are at grade, stirring-head is pushed down into the joint of end ring and sliver in cold conditions, the stirring-head high speed rotating also moves along the contact-making surface of end ring and sliver, the friction Stir direction be from the inside of end ring to outside or from the outside of end ring to inner friction Stir, the shaft shoulder of the stirring-head by high speed rotating contacts with the end face of sliver and frictional heat with the end ring plane, make the local temperature of end ring and sliver reach fusion temperature, the contact-making surface of end ring and sliver fuses into one.

2, according to the friction stir welding method of described motor rotor end ring of claim 1 and sliver, it is characterized in that, make the frictional heat local temperature of end ring and sliver reach 500 ℃-700 ℃.

According to the friction stir welding method of claim 1 or 2 described motor rotor end ring and sliver, it is characterized in that 3, a sliver carries out 2 welding.

4, a kind of special equipment of realizing the friction stir welding method of described motor rotor end ring of claim 1 and sliver, it is characterized in that, comprise a motion platform, one end of described motion platform is fixed with column, the rotor rotating mechanism is installed on the guide rail of motion platform, in the described rotor rotating mechanism anchor clamps that are used for fixing rotor is installed, be fixed with crossbeam on the column guide rail, the stirring welding head of band stirring-head is installed on the guide rail of crossbeam, and stirring-head is installed in and stirs in the welding head.