Low-spatter laser welding method suitable for X-Pin motor stator Pin

Abstract

The invention discloses a low-splash laser welding method suitable for X-Pin motor stator pins, and relates to the field of laser processing application, the method comprises the following steps: configuring a pin clamping tool, and clamping and lapping the pins of a permanent magnet motor stator by using the pin clamping tool; performing laser welding on the pins of the permanent magnet motor stator by using a pre-configured composite laser welding lens based on the laser welding position, the laser welding path and an anti-reflection mechanism; and a laser beam spot control mechanism is utilized to expand the range of a molten pool for laser welding and reduce the welding energy density of laser. According to the X-Pin motor copper welding device, the characteristics that light spots of a semiconductor blue light laser are uniform, the blue light absorptivity of copper is high, and the absorptivity changes slightly along with the temperature are utilized, the mode that the blue light spots replace infrared annular light spots is adopted, extremely-low splashing of X-Pin motor copper welding is achieved, the use cost is lower, and large-batch production is better facilitated.

Description

Technical Field

[0001] The invention relates to the field of laser processing applications, and in particular to a low-spatter laser welding method suitable for X-Pin motor stator pin feet. Background Art

[0002] In the past two years, the new energy vehicle industry has experienced explosive growth, and market competition has become increasingly fierce. In order to expand their market share, major automobile manufacturers have worked hard on cost control, performance optimization, and other aspects to improve the overall competitiveness of their products. As the core power component of new energy vehicles, permanent magnet motors have an energy conversion efficiency of up to 96%-97%, which is much higher than that of internal combustion engines. Their performance is the core factor affecting the performance of electric vehicles.

[0003] The stator coil winding is the core component of the permanent magnet motor. The motor generates a rotating magnetic field through the three-phase winding. The rotating magnetic field interacts with the magnetic field of the permanent magnet on the rotor to complete the motor drive. Permanent magnet motors are divided into different schools according to the form of stator coil windings, including I-Pin, U-Pin, X-Pin, W-Pin, etc. Among them, I-Pin came out the earliest and has the most mature technology; U-Pin has the second longest development history; X-Pin, as a newly proposed solution, is still in the exploration stage.

[0004] The X-Pin winding is mainly optimized at the welding end, eliminating the straight line segment at the end and connecting it in a cross X shape, further improving the filling rate and compactness of the winding. With lower copper loss and higher slot fill rate, it is expected to become the king of flat wire motors. X-Pin motor stator welding is a key step in the process, and its key process parameters are high penetration, fast welding and low spatter. The current mainstream annular infrared light welding can meet the process requirements of ≥1.8mm penetration, and the welding efficiency can be controlled within 0.3s, but the process requirements of extremely low spatter or even no spatter have not been solved. The annular infrared light source does have less continuous spatter than a single infrared beam when welding highly reflective materials, but the absorption rate of copper to infrared lasers determines the inevitability of spatter. At room temperature, the absorption rate of copper to infrared lasers is only about 3%-5%; when the temperature gradually rises to 1250K-1350K, the absorption rate of copper to infrared lasers suddenly jumps to about 15%, such as Figure 1 shown.

[0005] The sudden change in the infrared light absorption rate causes the heat accumulation rate in the liquid copper molten pool to soar several times in an instant under the condition of the same laser power density. At this time, the liquid copper absorbs a sharp increase in heat, causing the script temperature to rise sharply. The sudden temperature rise causes the absorption rate to further increase, which makes the temperature rise more intense. The thermal conductivity characteristics of copper cannot balance the huge temperature difference. The laser heating position even reaches a level close to the boiling point of liquid copper, causing violent disturbances in the molten pool. Ultimately, the continuous heat input causes the copper molten pool to fluctuate violently, causing boiling and explosion inside the molten pool, resulting in spatter defects. These spatters will not only burn the paint, but also adhere to the silicon steel sheet of the stator, causing local micro-short circuits. Welding spatter is a major technical shortcoming that currently restricts the development of X-Pin technology. The suppression of spatter is the key to improving the yield. Spatter causes defects such as Figure 2 shown.

[0006] The current mainstream annular infrared light source is a combination of a Gaussian beam and an annular beam. The Gaussian beam ensures sufficient melting depth through high energy density; the annular beam is obtained through beam shaping, and relatively uniform regional heating of copper is achieved through dispersed annular light spots. The annular beam design expands the molten pool width, which to a certain extent reduces the boiling and explosion of the molten pool caused by the drastic change in the absorption rate of high-temperature copper, and reduces the risk of spatter. However, this solution cannot solve the problem of sudden changes in the absorption rate of high-temperature copper. The boiling and explosion of the molten pool can only be reduced, and the spatter problem cannot be fundamentally solved. Annular infrared light sources such as Figure 3 shown.

[0007] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0008] In view of the problems in the related art, the present invention proposes a low-splash laser welding method suitable for X-Pin motor stator Pin feet to overcome the above-mentioned technical problems existing in the existing related art.

[0009] To this end, the specific technical solution adopted by the present invention is as follows:

[0010] A low-spatter laser welding method suitable for X-Pin motor stator pin feet, the method comprising:

[0011] S1. Configure a pin clamping tool, and use the pin clamping tool to clamp and overlap the pins of the permanent magnet motor stator;

[0012] S2. Using a pre-configured composite laser welding lens, and based on a laser welding position, a laser welding path, and an anti-reverse mechanism, laser welding the pins of the permanent magnet motor stator;

[0013] S3. Utilize the laser beam spot control mechanism to expand the molten pool range of laser welding and reduce the laser welding energy density.

[0014] Furthermore, configuring a pin clamping tool, and using the pin clamping tool to clamp and overlap the pins of the permanent magnet motor stator includes:

[0015] A first tooling plate and a second tooling plate of a pin clamping tooling are provided, and the pins of the permanent magnet motor stator are aligned with the holes in the first tooling plate and the second tooling plate;

[0016] The starting tool is used to overlap the inner and outer ring pins of the permanent magnet motor stator facing each other.

[0017] Furthermore, in order to be able to composite red and blue light sources, the pre-configured composite laser welding lens includes a shell, a high-absorption beam guiding component is arranged in the middle of the shell, an auxiliary beam guiding component is arranged on one side of the shell, and an imaging component is arranged on the other side of the shell; a protective lens is arranged at the bottom of the shell, a composite light outlet is arranged at the bottom end of the protective lens, and a coaxial air blowing interface is arranged on one side of the protective lens.

[0018] Furthermore, in order to transmit blue light with high absorption rate and reflect auxiliary red light, the high absorption rate beam guiding assembly includes a high absorption rate beam channel arranged in the middle of the shell, a first collimation entrance is arranged at one end of the high absorption rate beam channel, and a first lens and a second lens are arranged in sequence in the middle of the high absorption rate beam channel, and the first lens and the second lens are used to reflect and transmit the light beam.

[0019] Furthermore, in order to provide an auxiliary red light beam, the auxiliary beam guiding assembly includes an auxiliary beam channel arranged on one side of the shell, a third lens is arranged at the corner of the auxiliary beam channel, a second collimation entrance is arranged at one end of the auxiliary beam channel, the other end of the auxiliary beam channel extends to the first lens, and a swing motor is arranged on one side of the third lens.

[0020] Furthermore, in order to complete the imaging work of welding, the imaging component includes a camera optical path arranged on the other side of the shell, a fourth lens is arranged at the corner of the camera optical path, a camera and an imaging lens are arranged in sequence at one end of the camera optical path, and the other end of the camera optical path extends to the second lens.

[0021] Further, laser welding positions include:

[0022] The laser welding position is determined based on the principle of ensuring that the weld has effective penetration and uniform heat-affected zone.

[0023] Further, the laser welding path includes:

[0024] Cover the pins of the permanent magnet motor stator with a high absorption rate beam; set the swing path and swing radius of the auxiliary beam according to the pin size of the permanent magnet motor stator;

[0025] When the pins of the permanent magnet motor stator are heated individually, the path of the auxiliary light beam covers the pins of the permanent magnet motor stator;

[0026] When the pins of the permanent magnet motor stator connected in parallel are heated, the path of the auxiliary light beam crosses the parallel pins.

[0027] Furthermore, the anti-counterattack mechanism includes:

[0028] The pre-configured composite laser welding lens has a preset range of tilt angles relative to the vertical plane.

[0029] Further, the laser beam spot control mechanism includes:

[0030] Increase the size of the laser beam spot by setting the defocus amount.

[0031] The beneficial effects of the present invention are:

[0032] (1) The present invention utilizes the uniform spot of semiconductor blue laser, the high absorption rate of copper to blue light, and the small change of absorption rate with temperature. The blue light spot is used instead of the infrared annular spot to achieve extremely low spatter in X-Pin motor copper welding. It can achieve the process standards of X-Pin stator weld depth ≥ 2mm, welding heat affected zone ≤ 5mm, and extremely low welding spatter. In addition, the present invention has lower use cost and is more conducive to mass production.

[0033] (2) Compared with infrared ring beam, blue light beam has the following advantages:

[0034] Copper's absorption rate of blue light is as high as 65%, which is 13 times that of infrared light. In theory, 1 / 13 of the energy of blue light can achieve the heating effect of infrared light, which greatly improves energy efficiency. Similar effects can be achieved with lower power, and equipment costs and energy consumption costs are greatly reduced. The absorption rate of copper at different temperatures to blue light changes very little, and there will be no problem of sudden changes in the absorption rate of high-temperature copper near the melting point, and boiling explosion will hardly occur. At present, the spot of blue light semiconductor laser does not require any processing and is flat-top light, and no beam shaping is required. It is simpler and more convenient to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is the temperature curve of copper's absorption rate of infrared laser;

[0037] Figure 2 It is a bad schematic diagram caused by welding spatter;

[0038] Figure 3 It is the principle diagram of the annular infrared beam;

[0039] Figure 4 This is the principle diagram of the red and blue composite beam;

[0040] Figure 5 This is a schematic diagram of the bending method of the X-Pin motor tooling;

[0041] Figure 6 This is a schematic diagram of the X-Pin winding pin fitting method;

[0042] Figure 7 It is a structural schematic diagram of a pre-configured composite laser welding lens in a low-spatter laser welding method suitable for an X-Pin motor stator pin according to an embodiment of the present invention;

[0043] Figure 8 It is a schematic diagram of the internal structure of a composite laser welding lens pre-configured in a low-spatter laser welding method suitable for an X-Pin motor stator pin according to an embodiment of the present invention;

[0044] Fig. 9 It is a schematic diagram of the red-blue composite welding process;

[0045] Fig.10 It is a schematic diagram of the red and blue composite laser processing path;

[0046] Fig.11 It is a schematic diagram of the laser anti-reverse tilt angle;

[0047] Fig.12 This is a comparison chart of temperature rise curves of blue light and infrared light;

[0048] Fig.13 The present invention is a flowchart of a low-spatter laser welding method suitable for X-Pin motor stator pins according to an embodiment of the present invention.

[0049] In the figure:

[0050] 1. Shell; 2. High-absorption rate beam guiding assembly; 201. High-absorption rate beam channel; 202. First collimation entrance; 203. First lens; 204. Second lens; 3. Auxiliary beam guiding assembly; 301. Auxiliary beam channel; 302. Third lens; 303. Second collimation entrance; 304. Swing motor; 4. Imaging assembly; 401. Camera optical path; 402. Fourth lens; 403. Camera; 404. Imaging lens; 5. Protective lens; 6. Composite light outlet; 7. Coaxial air blowing interface. DETAILED DESCRIPTION

[0051] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0052] According to an embodiment of the present invention, a low-spatter laser welding method suitable for X-Pin motor stator pins is provided. Specifically, it relates to X-Pin welding in permanent magnet motors. A red-blue composite light source (light beam) is used to replace the current mainstream infrared ring light source (light beam) to perform pin welding of flat wire motors.

[0053] The present invention is further described with reference to the accompanying drawings and specific embodiments. Fig.13 As shown, according to an embodiment of the present invention, a low-spatter laser welding method applicable to an X-Pin motor stator Pin leg comprises:

[0054] S1. Configure a pin clamping tool, and use the pin clamping tool to clamp and overlap the pins (pin feet) of the stator of the permanent magnet motor (X-Pin motor).

[0055] S2. Using a pre-configured composite laser welding lens, and based on the laser welding position, laser welding path and anti-reverse mechanism, laser welding is performed on the pins of the permanent magnet motor stator.

[0056] S3. Utilize the laser beam spot control mechanism to expand the molten pool range of laser welding and reduce the laser welding energy density.

[0057] In one embodiment, configuring a pin clamping tool, and using the pin clamping tool to clamp and overlap the pins of the permanent magnet motor stator includes:

[0058] A first tooling plate and a second tooling plate of a pin clamping tooling are provided, and the pins of the permanent magnet motor stator are aligned with the holes in the first tooling plate and the second tooling plate.

[0059] The starting tool is used to overlap the inner and outer ring pins of the permanent magnet motor stator facing each other.

[0060] like Figure 7-Figure 8As shown, in one embodiment, a preconfigured composite laser welding lens includes a shell 1, a high-absorption rate beam guiding component 2 is arranged in the middle of the shell 1, an auxiliary beam guiding component 3 is arranged on one side of the shell 1, and an imaging component 4 is arranged on the other side of the shell 1; a protective lens 5 is arranged at the bottom of the shell 1, a composite light outlet 6 is arranged at the bottom end of the protective lens 5, and a coaxial blowing interface 7 is arranged on one side of the protective lens 5, so as to be able to composite the red and blue light sources.

[0061] In one embodiment, the high-absorption rate beam guiding assembly 2 includes a high-absorption rate beam channel 201 arranged in the middle of the shell 1, a first collimation entrance 202 is arranged at one end of the high-absorption rate beam channel 201, a first lens 203 and a second lens 204 are arranged in sequence in the middle of the high-absorption rate beam channel 201, and the first lens 203 and the second lens 204 are used to reflect and transmit the light beam, so as to transmit the blue light with high absorption rate and reflect the auxiliary red light.

[0062] In one embodiment, the auxiliary beam guiding assembly 3 includes an auxiliary beam channel 301 disposed on one side of the housing 1, a third lens 302 is disposed at a corner of the auxiliary beam channel 301, a second collimation entrance 303 is disposed at one end of the auxiliary beam channel 301, and the other end of the auxiliary beam channel 301 extends to the first lens 203, and a swing motor 304 is disposed on one side of the third lens 302, thereby providing an auxiliary red light beam. The swing motor 304 is used to control the auxiliary beam so that the auxiliary beam, i.e., infrared light, moves quickly along a specified path without moving the lens.

[0063] In one embodiment, the imaging component 4 includes a camera optical path 401 arranged on the other side of the shell 1, a fourth lens 402 is arranged at the corner of the camera optical path 401, a camera 403 and an imaging lens 404 are arranged in sequence at one end of the camera optical path 401, and the other end of the camera optical path 401 extends to the second lens 204, thereby completing the imaging work of welding.

[0064] In one embodiment, the laser welding locations include:

[0065] The laser welding position is determined based on the principle of ensuring that the weld has effective penetration and uniform heat-affected zone.

[0066] In one embodiment, the laser welding path includes:

[0067] A high absorption rate beam is used to cover the pins of the permanent magnet motor stator; and a swing path and a swing radius of the auxiliary beam are set according to the pin size of the permanent magnet motor stator.

[0068] When the pins of the permanent magnet motor stator are heated individually, the path of the auxiliary light beam covers the pins of the permanent magnet motor stator.

[0069] When the pins of the permanent magnet motor stator connected in parallel are heated, the path of the auxiliary light beam crosses the parallel pins.

[0070] In one embodiment, the anti-rebound mechanism includes:

[0071] The pre-configured composite laser welding lens has a preset range of tilt angles relative to the vertical plane.

[0072] In one embodiment, utilizing a laser beam spot control mechanism includes:

[0073] Increase the size of the laser beam spot by setting the defocus amount.

[0074] In order to facilitate understanding of the above technical solutions of the present invention, the working principle of the present invention in the actual process is described in detail below.

[0075] The present invention uses a red-blue composite beam to integrate an infrared Gaussian beam with a blue flat-top beam, and uses a blue flat-top beam to replace an infrared annular beam to achieve pin welding. Figure 4 shown.

[0076] The specific implementation of the present invention is as follows:

[0077] 1) According to the number of solder joints on different X-Pin stators, a tooling is designed so that each pin can be clamped and fit tightly. The tooling is divided into upper and lower plates. During the installation process, the PIN pins on the X-Pin stator are matched one by one with the holes on the tooling, and tightly inserted into the holes on the tooling. After insertion, start the tooling, rotate the upper plate to the left, and the lower plate to the right, so that the two copper wires are bent in one direction, such as Figure 5 shown.

[0078] 2) The outer ring of the X-Pin winding Pin is bent to the left, and the inner ring of the Pin is bent to the right. The inner and outer bends are spliced ​​towards each other, and finally the Pin overlap is achieved, such as Figure 6 shown.

[0079] 3) The laser welding equipment uses single-mode infrared laser and semiconductor blue light laser as light sources; the welding lens uses a red-blue composite welding lens.

[0080] The red-blue composite welding lens is the core component of this proposal, which consists of a fiber optic alignment interface, a blue light alignment interface, a CCD camera, a protective lens, an imaging lens and other components. Figure 7-Figure 8 shown.

[0081] The red-blue composite lens can transmit infrared light and blue light at the same time, realizing the coaxial light output of infrared light and blue light. The light outlet of the welding lens not only needs to output red-blue composite light, but also needs to provide coaxial air blowing to provide nitrogen protection during the welding process. The infrared light of the red-blue composite light can be swung in a small range by a small motor; the blue light can be wrapped and does not need to swing.

[0082] At the same time, the equipment needs to be equipped with a chiller to cool down core components such as infrared lasers, blue light lasers, and red-blue composite welding heads to ensure the stability of core components.

[0083] 4) During welding, the composite lens provides coaxial air blowing to prevent metal oxidation during welding. The welding position is at the center of the two pins to ensure that the weld has a large penetration depth and a uniform heat-affected zone. In addition, the blue light covers the infrared light and does not swing. The infrared laser sets a reasonable swing path and swing radius according to the size of the X-Pin copper wire, which can effectively increase the effective penetration depth and cladding area of ​​the weld. The welding process is as follows Fig. 9 shown.

[0084] 5) The path and radius of laser swing are related to the structure of the pin. The pin of the X-Pin motor is made of two bare copper pillars, the bare length of the copper pillar is about 5mm, and the rest is painted. The welding process must be completed within 0.2s, otherwise the copper pillar will transfer heat to the paint position and burn the paint.

[0085] During the red-blue composite laser welding process, the blue light part covers the entire pin, and no path planning is required. The infrared laser welding path is divided into two parts: one part is to heat the two pin positions separately; the other part is to achieve parallel connection between the two pins.

[0086] The first part makes the temperature of the two pins reach a state close to the melting point in a short period of time. The requirement is to heat as evenly as possible and scan every part of the pin as much as possible. The processing speed of the first part of the infrared laser is related to the blue light power and the size of the pin. The larger the size of the pin, the more energy is required for heating and the longer it takes. The greater the blue light power, the more heating functions are shared, and the shorter the infrared time is. Even when the blue light is large enough to heat the pin to a temperature near the melting point within 0.1s, the first part of the infrared laser processing path can be omitted. From the experimental results, it is known that when the blue light power exceeds 700W, the infrared light processing can be cancelled.

[0087] The second part makes the two pins melt into one. The path planning determines the shape and melting depth after melting. The processing path of the second part needs to span the two pins. It can be a circular path or an elliptical path. The radius of the path determines the width of the melting, and the processing time determines the depth of melting. The overall laser processing path, such as Fig.10 shown.

[0088] 6) Anti-reverse mechanism needs to be considered during welding, such as Fig.11 As shown. The welding head cannot be completely perpendicular to the vertical plane, and a certain range of inclination angles must be maintained. The inclination angle of the welding head to the vertical plane is ≥2° to prevent copper from reflecting too much infrared light and damaging optical devices; in addition, the inclination angle must be ≤10° to avoid paint burnout caused by uneven heat-affected zones.

[0089] 7) The high absorption rate of blue light can ensure that it only needs about 700W of light output power to achieve the same temperature rise efficiency as 6000W infrared ring light, and can raise the temperature of the copper at the pin position from room temperature to 1300K within 0.1s. The blue light absorption rate does not increase in a jumpy manner with the increase in temperature, which can ensure that the entire heating process is very smooth and will not cause boiling problems near the melting point of copper due to a sharp increase in absorption rate. The temperature rise curves of 700W blue light and 6000W infrared ring light are compared, as shown in the figure. Fig.12 shown.

[0090] Blue light only needs 700W of output power to achieve the temperature rise effect of 6000W of infrared light, which can greatly reduce equipment costs and energy consumption costs. Blue light can ensure that the temperature rise of more than 1300K is completed within 0.1s, which can effectively control the heat accumulation during welding and avoid excessive damage to the paint in the heat-affected zone. The overall heating process of blue light is smooth and has no boiling explosion characteristics. In theory, it can almost completely eliminate the generation of spatter, thereby greatly improving product yield.

[0091] 8) The infrared Gaussian beam relies on its own high energy density and the absorption rate enhancement characteristics given by blue light heating to provide sufficient melting depth for the welding molten pool. In addition, the blue light is heated steadily, and the temperature increase increases the infrared laser energy absorption rate of the copper layer, which can further increase the effective melting depth. Experimental verification shows that with the cooperation of 700W blue light, an infrared Gaussian beam of about 2000W can achieve a melting depth of more than 1.8mm, which meets the process requirements of pin welding.

[0092] 9) During welding, the laser beam spot size can be increased by setting a certain defocus amount. This method can expand the molten pool range and reduce the energy density, thereby further reducing the risk of welding spatter.

[0093] According to actual tests, the welding time of the solution of the present invention can be stably controlled within 1.8s, the penetration depth can be controlled above 1.8mm, and the spatter is extremely low. Take the commonly used X-Pin pins of 4mm*3.2mm*1.6mm, 3mm*2.65mm*2.2mm, and 4mm*3.5mm*2.4mm as examples.

[0094] The pin size is 4mm*3.2mm*1.6mm. It takes 0.15s to achieve a cladding diameter of about 1.4mm, an effective melting depth of about 1.9mm, a heat-affected zone of about 3.5mm, good paint skin with no loss, full and round solder joints, and no spatter.

[0095] The pin foot size is 3mm*2.65mm*2.2mm, the time is 0.17s, the cladding diameter is about 2.7mm, the effective melting depth is about 2.5mm, the heat affected zone is about 3mm, the paint skin is good with no loss, the weld point is full and round, and there is no spatter.

[0096] The pin foot size is 4mm*3.5mm*2.4mm, and it takes 0.18s. The cladding diameter is about 3.1mm, the effective melting depth is about 2.8mm, the heat affected zone is about 3.5mm, the paint skin is good with no loss, the weld point is full and round, and there is no spatter.

[0097] In summary, the current mainstream X-Pin welding can be processed using the solution of the present invention and can achieve good processing results.

[0098] In addition, the present invention also includes the following solutions:

[0099] 1. Use blue light beam shaping to shape the blue light into a ring or other shape to replace the flat top beam.

[0100] 2. Use green light, blue light or other bands of laser Gaussian beams to replace infrared Gaussian beams.

[0101] 3. In addition to the X-Pin motor, the red and blue composite beam is applied to the Hair-Pin and I-Pin motors.

[0102] The invention provides a processing technology for welding X-Pin copper wire pins with a red-blue composite light source. Infrared + blue light composite welding equipment is used to complete laser welding along a welding track under the protection of coaxial air blowing.

[0103] Blue laser welding heats up quickly, promoting copper's absorption of infrared lasers and avoiding the problem of drastic changes in copper's infrared absorption rate; infrared lasers provide a large energy density to ensure effective melting depth ≥1.8mm. Compared with ring infrared lasers, red and blue composite light sources not only have lower light source costs, but also achieve low spatter in welding, greatly improving welding quality.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-spatter laser welding method suitable for X-Pin motor stator pin feet, characterized in that: The method includes: S1. Configure a pin clamping tool, and use the pin clamping tool to clamp and overlap the pins of the permanent magnet motor stator; S2. Using a pre-configured composite laser welding lens, and based on a laser welding position, a laser welding path, and an anti-reverse mechanism, laser welding the pins of the permanent magnet motor stator; S3. Utilize the laser beam spot control mechanism to expand the molten pool range of laser welding and reduce the laser welding energy density.

2. A low spatter laser welding method for X-Pin motor stator pin according to claim 1, characterized in that: The method of configuring a pin clamping tool and using the pin clamping tool to clamp and overlap the pins of the permanent magnet motor stator includes: A first tooling plate and a second tooling plate of a pin clamping tooling are provided, and the pins of the permanent magnet motor stator are aligned with the holes in the first tooling plate and the second tooling plate; The starting tool is used to overlap the inner and outer ring pins of the permanent magnet motor stator facing each other.

3. The low-spatter laser welding method for X-Pin motor stator pin according to claim 1, characterized in that: The pre-configured composite laser welding lens comprises a housing (1), a high-absorption rate beam guiding component (2) is arranged in the middle of the housing (1), an auxiliary beam guiding component (3) is arranged on one side of the housing (1), and an imaging component (4) is arranged on the other side of the housing (1); A protective lens (5) is provided at the bottom of the housing (1), a composite light outlet (6) is provided at the bottom end of the protective lens (5), and a coaxial air blowing interface (7) is provided on one side of the protective lens (5).

4. A low spatter laser welding method for X-Pin motor stator pin according to claim 3, characterized in that: The high-absorption rate light beam guiding component (2) comprises a high-absorption rate light beam channel (201) arranged in the middle of the housing (1); a first collimating entrance (202) is arranged at one end of the high-absorption rate light beam channel (201); a first lens (203) and a second lens (204) are arranged in sequence in the middle of the high-absorption rate light beam channel (201); and the first lens (203) and the second lens (204) are used for reflecting and transmitting light beams.

5. A low-spatter laser welding method for X-Pin motor stator pins according to claim 4, characterized in that: The auxiliary beam guiding assembly (3) comprises an auxiliary beam channel (301) arranged on one side of the housing (1); a third lens (302) is arranged at a corner of the auxiliary beam channel (301); a second collimation entrance (303) is arranged at one end of the auxiliary beam channel (301); the other end of the auxiliary beam channel (301) extends to the first lens (203); and a swing motor (304) is arranged on one side of the third lens (302).

6. A low-spatter laser welding method for X-Pin motor stator pins according to claim 5, characterized in that: The imaging assembly (4) comprises a camera optical path (401) arranged on the other side of the housing (1), a fourth lens (402) being arranged at a corner of the camera optical path (401), a camera (403) and an imaging lens (404) being arranged in sequence at one end of the camera optical path (401), and the other end of the camera optical path (401) extending to the second lens (204).

7. The low-spatter laser welding method for X-Pin motor stator pin according to claim 1, characterized in that: The laser welding positions include: The laser welding position is determined based on the principle of ensuring that the weld has effective penetration and uniform heat-affected zone.

8. The low-spatter laser welding method for X-Pin motor stator pin according to claim 6, characterized in that: The laser welding path includes: Cover the pins of the permanent magnet motor stator with a high absorption rate beam; set the swing path and swing radius of the auxiliary beam according to the pin size of the permanent magnet motor stator; When the pins of the permanent magnet motor stator are heated individually, the path of the auxiliary light beam covers the pins of the permanent magnet motor stator; When the pins of the permanent magnet motor stator connected in parallel are heated, the path of the auxiliary light beam crosses the parallel pins.

9. The low-spatter laser welding method for X-Pin motor stator pin according to claim 1, characterized in that: The anti-counterfeiting mechanism includes: The pre-configured composite laser welding lens has a preset range of tilt angles relative to the vertical plane.

10. The low-spatter laser welding method for X-Pin motor stator pin according to claim 1, characterized in that: The laser beam spot control mechanism comprises: Increase the size of the laser beam spot by setting the defocus amount.

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