Hot riveting jig and method suitable for nanocrystalline product hot riveting and copper bar pin flatness fixing process in industrial production

Abstract

The invention discloses a hot riveting jig and a method for fixing the flatness of a copper bar pin through hot riveting of a nanocrystalline product suitable for industrial production, firstly, a copper bar and a nanocrystalline assembly are preliminarily assembled in a welding jig, then a laser welding process is used for welding, and after welding is completed, a nanocrystalline copper bar assembly product is assembled; then the nanocrystalline copper bar assembly product is installed in a hot riveting jig to be fixed and limited, the nanocrystalline copper bar product and the hot riveting jig are placed in a pulse hot riveting welding equipment carrier to be fixed, then the equipment is started, and plastic parts in the nanocrystalline copper bar product are instantly hot-melted and cooled through an upper welding head and a lower welding head; according to the method, the copper bar pins are fixed to the same horizontal plane of the plastic part, then the nanocrystalline copper bar product is subjected to demolding treatment, and then the qualified nanocrystalline assembly can be obtained, through the method, the flatness of the copper bar pins of the nanocrystalline product is good, and when a client conducts reflow soldering, the copper bar pins can be fixed to the same horizontal plane of the plastic part. And the yield of one-time welding is improved.

Description

Technical Field

[0001] The present invention relates to the field of ultra-high precision flatness of multiple pins of nanocrystalline copper busbar components for new energy electric vehicles by hot riveting welding, a hot riveting jig and a method for hot riveting flatness of copper busbar pins of nanocrystalline products suitable for industrial production. Background Art

[0002] Nanocrystal hot riveting hot melt plastic parts fixed copper busbar assembly has the characteristics of large current carrying, low cost, high integration, space saving, convenient for PCB board reflow soldering, etc., which can meet the requirements of fast automated assembly. Compared with traditional coil windings, it is smaller in size, the copper busbar spacing is more stable, the resistivity is smaller, the product performance and function are more complete, and the connector design is simplified to a certain extent. The customer uses the reflow soldering process to fix the nanocrystal with copper busbar assembly to the PCB board. The poor flatness of the copper busbar pins will cause problems such as circuit disconnection and cold soldering on the PCB board, thereby affecting the customer's use and the quality of the product.

[0003] To this end, the present invention proposes a hot riveting jig and a method for hot riveting a copper bar pin flatness process for nanocrystalline products suitable for industrial production. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method for hot riveting the flatness of copper bar pins of nanocrystalline products suitable for industrial production, so as to avoid the problem that the flatness of multiple pins of the copper bar is greater than 0.1mm during the process of fixing the copper bar pins.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A hot riveting jig comprises a hot riveting jig body, wherein a cavity is provided inside the hot riveting jig body, wherein an installation area for a nanocrystalline copper busbar assembly product is provided at the center of the cavity, and push rod assemblies for making the copper busbar pins of the nanocrystalline copper busbar assembly product be in the same plane are symmetrically provided on the left and right sides of the installation area, the bottom of the push rod assembly is fixed to the bottom plate of the riveting jig body, and the upper surfaces of the push rod assemblies on both sides are at the same height, and two clamping blocks are symmetrically provided on the front and rear sides of the installation area, and the clamping blocks are fixed to the bottom plate of the riveting jig body.

[0007] Furthermore, the push rod assembly includes push rod one, push rod two, push rod three and push rod four, which are arranged in sequence from top to bottom. An elastic component one is arranged on the outer surface of each push rod facing outward, and an elastic component two is arranged on the outer surface of each clamping block facing outward, wherein all the elastic components one and two elastic components two constitute a demolding mechanism for demolding the nanocrystalline copper busbar assembly product.

[0008] Furthermore, the elastic component 1 includes a mounting disc 1 and a spring 1, the mounting disc 1 is fixed to the lower outer surface of the corresponding push rod, one end of the spring 1 is mounted on the mounting disc 1, and the other end of the spring 1 is mounted in a mounting groove 1 corresponding to the upper surface of the base plate.

[0009] Furthermore, the second elastic component includes a second mounting disc and a second spring, the second mounting disc is mounted on the clamping block, one end of the second spring is mounted on the second mounting disc, and the other end of the second spring is mounted in a second mounting groove correspondingly provided on the upper surface of the base plate.

[0010] Furthermore, a positioning column 1 is provided on the left side of the installation area, and a positioning column 2 and a positioning column 3 are provided on the right side from top to bottom in sequence, and the positioning column 1 and the positioning column 2 are both fixed on the bottom plate after passing through the hot riveting jig body, and the positioning column 3 is fixed in the side portion of the riveting jig body having thickness.

[0011] Furthermore, an upper cover is provided at the upper port of the heat riveting jig body, the upper cover is connected to the buckle through a rotating shaft, the lower end of the buckle is buckled on the bottom plate, and the heat riveting jig body is fixedly connected to the bottom plate by fastening screws.

[0012] The present invention also proposes a method for hot riveting a copper bar pin flatness process for nanocrystalline products suitable for industrial production, wherein the hot riveting jig is the hot riveting jig mentioned above; the method comprises the following specific steps:

[0013] S1: First, the copper busbar and nanocrystalline components are preliminarily assembled in a welding fixture, and then the I-shaped copper sheet and the U-shaped copper sheet are welded using a laser welding process. After welding, a nanocrystalline copper busbar component product with 4 windings and 8 pin terminals is assembled;

[0014] S2: Fixing the nanocrystalline copper busbar assembly product assembled in step S1 in the hot riveting fixture so that the copper busbar pins are on the same surface;

[0015] S3: Put the nanocrystalline copper busbar product and the hot riveting jig after being fixed and limited in step S2 into the carrier of the pulse hot riveting welding equipment, then turn on the equipment, adjust the carrier in the Z-axis direction to reach the specified position, and then instantly melt and cool the plastic parts in the nanocrystalline copper busbar product through the upper and lower welding heads, so that the copper busbar pins are fixed on the same horizontal plane of the plastic parts;

[0016] S4: After the copper busbar pins are fixed on the same horizontal plane of the plastic part in step S3, the nanocrystalline copper busbar product is demoulded to obtain a nanocrystalline component with a copper busbar pin flatness of less than 0.1 mm.

[0017] Furthermore, in step S1, the copper bar pin coplanarity after the copper bar and the nanocrystalline component are preliminarily assembled in the laser welding fixture is less than 0.03 mm; in step S1, the welding power of the thick copper bar is 80%, the welding process is straight-line short-distance circular jitter welding, and the jitter radius is controlled at 2.5 mm; the welding power of the thin copper bar is 60%, the welding process is straight-line short-distance circular jitter welding, and the jitter radius is controlled at 1 mm;

[0018] The specific process of step S2 is as follows:

[0019] Place the nanocrystalline copper busbar assembly product assembled in step S1 in the installation area, wherein the copper busbar pins on the left and right sides cooperate with the upper surfaces of their corresponding push rods, so that the copper busbar pins of the nanocrystalline product are lifted up by eight push rods in the hot riveting carrier, and the clamping blocks on the front and rear sides clamp the nanocrystalline copper busbar assembly product, and then cover the upper cover according to the position of the positioning column, and then fasten and lock the front and rear side buckles to keep the copper busbar pins on the same surface.

[0020] Furthermore, the specific process of step S3 is as follows:

[0021] S3.1: The first stage: the energy is 40-50%, the pulse heating duration is 2-3s, and the temperature is 350-370℃;

[0022] ① The vehicle reaches the specified position 161.700mm in the Y-axis direction, and the speed is 60.00mm / s;

[0023] ② The upper 4 welding heads reach the designated position 122.191mm in the Z-axis direction, with an initial velocity of 60.00mm / s;

[0024] ③ The Z-axis direction of the next two welding heads reaches the specified position of 41.950mm, and the initial speed is 60.00mm / s;

[0025] S3.2: The second stage: the energy is 50-60%, the pulse heating duration is 12-15s, and the temperature is 390-410℃;

[0026] ①The specified position in the Y-axis direction remains unchanged;

[0027] ② The upper 4 welding heads continue to descend in the Z-axis direction, the buffer speed is 0.150mm / s, and the buffer distance is set to 1.2mm;

[0028] ③ The next two welding heads continue to rise in the Z-axis direction, the buffer speed is 0.150mm / s, and the buffer distance is set to 0.6mm;

[0029] S3.3: Pressurize and heat the upper and lower welding heads at the same time, the pressure is 8-10kg, and keep the temperature and pressure for 10s;

[0030] S3.4: Rapidly cool to 100-120°C, and keep the cooling time for 5-7s to allow the plastic part to be fixed;

[0031] S3.5: Raise the temperature to 150-200℃ for demoulding, and at the same time, lift the upper and lower welding heads by 1mm to reduce the pulling of plastic parts near the copper busbar pins during demoulding, which will affect the flatness of the copper busbar pins.

[0032] Furthermore, in step S4, the demoulding process of the nanocrystalline copper busbar product is as follows:

[0033] First, open the clips on the front and rear sides of the hot riveting fixture body to remove the upper cover, and then use all the elastic components one and two to push out the nanocrystalline copper busbar assembly product.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] 1) The hot riveting jig of the present invention is provided with push rod assemblies symmetrically on the left and right sides of the installation area, and the upper surfaces of the push rod assemblies on both sides are at the same height. The copper bar pins on the left and right sides of the nanocrystalline copper bar assembly product cooperate with the upper surfaces of the corresponding push rods, so that the copper bar pins of the nanocrystalline product are lifted by eight push rods in the hot riveting carrier, so that the coplanarity of the copper bar pins after the copper bar and the nanocrystalline assembly are initially assembled in the welding jig is maintained to be less than 0.03mm;

[0036] 2) The hot riveting jig of the present invention is provided with a positioning column 1 on the left side of the installation area, and a positioning column 2 and a positioning column 3 are provided on the right side from top to bottom, so that the operator can accurately install the position of the nanocrystalline copper busbar assembly product, and even inexperienced workers can operate quickly and accurately;

[0037] 3) The present invention first preliminarily assembles the copper bar and the nanocrystalline component in a welding fixture, so that the coplanarity of the copper bar pins is less than 0.03 mm, and then uses a laser welding process to weld the I-type copper sheet and the U-type copper sheet. After welding, a nanocrystalline copper bar component product with 4 windings and 8 pin terminals is assembled. Then, the nanocrystalline copper bar component product is installed in the hot riveting fixture of the present invention for fixed positioning, so that the coplanarity of the copper bar pins of the product is maintained at less than 0.03 mm. The nanocrystalline copper bar product after fixed positioning and the hot riveting fixture are placed in a pulse hot riveting welding equipment carrier for fixing, and then the equipment is turned on, and the carrier is adjusted to a specified position in the Z-axis direction. Then, the plastic parts in the nanocrystalline copper bar product are instantly hot-melted and cooled by upper and lower welding heads, so that the copper bar pins are fixed on the same horizontal plane of the plastic parts, and the copper bar pins are fixed on the same horizontal plane of the plastic parts. Then, the nanocrystalline copper bar product is demoulded to obtain a nanocrystalline component with a copper bar pin flatness of less than 0.1 mm.

[0038] 4) The copper bus pin fixing process of the present invention has good pin flatness and excellent fixing reliability of the nanocrystalline product copper bus pin, and provides a one-time soldering yield when the customer performs reflow soldering, and saves the amount of solder paste;

[0039] 5) The present invention firstly performs laser welding on the copper bar and the nanocrystal to ensure that during the welding process, the copper bar pins are kept within a flatness of 0.03 mm to avoid deformation of the copper bar caused by the high temperature of laser welding;

[0040] 6) The present invention uses a method of simultaneous six-channel pulse heat riveting welding to keep the pin flatness of the copper busbar within 0.1 mm, and the manufacturability is increased to 99%. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of the hot riveting jig in the present invention;

[0042] Figure 2 It is a schematic diagram of the main structure of the hot riveting jig in the invention;

[0043] Figure 3 It is a schematic diagram of the structure of the bottom plate of the hot riveting jig in the present invention;

[0044] Figure 4 This is a diagram showing the flatness test results of the product after heat riveting and curing in Example 1 of the present invention;

[0045] Figure 5 This is a diagram showing the flatness test results of the product after heat riveting and curing in Comparative Example 1 of the present invention;

[0046] Figure 6 This is a diagram showing the flatness test results of the product after heat riveting and curing in Comparative Example 2 of the present invention;

[0047] Figure 7 This is a diagram showing the flatness test results of the product after heat riveting and curing in Comparative Example 3 of the present invention;

[0048] Figure 8 This is a diagram showing the flatness test results of the product after heat riveting and curing in Comparative Example 4 of the present invention.

[0049] In the figure: 1. hot riveting fixture body; 2. installation area; 3. clamping block; 4. bottom plate; 5. push rod one; 6. push rod two; 7. push rod three; 8. push rod four; 9. mounting disc one; 10. spring one; 11. mounting disc two; 12. spring two; 13. positioning column one; 14. positioning column two; 15. positioning column three; 16. upper cover; 17. fastening screws; 18. buckle; 19. rotating shaft. DETAILED DESCRIPTION

[0050] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the scope of protection of the present invention is not limited to the described scope.

[0051] Please refer to Figure 1-3 A hot riveting jig comprises a hot riveting jig body 1, a cavity is arranged inside the hot riveting jig body 1, wherein an installation area 2 for a nanocrystalline copper busbar assembly product is arranged at the center of the cavity, and push rod assemblies are symmetrically arranged on the left and right sides of the installation area 2, which are used to make the copper busbar pins of the nanocrystalline copper busbar assembly product be in the same plane, the bottom of the push rod assembly is fixed on the bottom plate 4 of the riveting jig body 1, and the upper surfaces of the push rod assemblies on both sides are at the same height, and two clamping blocks 3 are symmetrically arranged at the front and rear ends of the installation area 2, and the clamping blocks 3 are fixed on the bottom plate 4 of the riveting jig body 1.

[0052] The push rod assembly includes push rod one 5, push rod two 6, push rod three 7 and push rod four 8 which are arranged in sequence from top to bottom. An elastic component one is arranged on the outer surface of each push rod facing outward, and an elastic component two is arranged on the outer surface of each clamping block 3 facing outward. All the elastic components one and two elastic components two constitute a demolding mechanism for demolding the nanocrystalline copper busbar assembly product.

[0053] The elastic component 1 includes a mounting disc 19 and a spring 10. The mounting disc 19 is fixed to the lower outer surface of the corresponding push rod. One end of the spring 10 is mounted on the mounting disc 19, and the other end of the spring 10 is mounted in a mounting groove 1 corresponding to the upper surface of the base plate 4.

[0054] The second elastic component includes a second mounting disc 11 and a second spring 12. The second mounting disc 11 is mounted on the clamping block 3. One end of the second spring 12 is mounted on the second mounting disc 11. The other end of the second spring 12 is mounted in a second mounting groove correspondingly provided on the upper surface of the bottom plate 4.

[0055] In order to facilitate the operator to accurately install the nanocrystalline copper busbar assembly product position, a positioning column 13 is provided on the left side of the installation area 2, and a positioning column 2 14 and a positioning column 3 15 are provided on the right side from top to bottom. The positioning column 13 and the positioning column 2 14 are both fixed on the bottom plate 4 after passing through the hot riveting jig body 1, and the positioning column 3 15 is fixed in the side portion of the riveting jig body 1 with thickness.

[0056] The upper port of the hot riveting jig body 1 is detachably provided with an upper cover 16. In this embodiment, the upper cover 16 is connected to the buckle 18 through a rotating shaft 19. The lower end of the buckle 18 is buckled on the bottom plate 4. Furthermore, positioning pins are symmetrically provided at both ends of the buckle to assist in positioning and locking the bottom plate 4. The hot riveting jig body 1 is fixedly connected to the bottom plate 4 by fastening screws 17.

[0057] Example 1

[0058] S1: First, the copper busbar and nanocrystalline components are preliminarily assembled in a laser welding fixture, and then the I-shaped copper sheet and the U-shaped copper sheet are welded using a laser welding process. After welding, a nanocrystalline copper busbar component product with 4 windings and 8 pin terminals is assembled;

[0059] The welding power of thick copper bar is 80%, the welding process is straight line short distance circular jitter welding, and the jitter radius is controlled at 2.5mm; the welding power of thin copper bar is 60%, the welding process is straight line short distance circular jitter welding, and the jitter radius is controlled at 1mm;

[0060] S2: Place the nanocrystalline copper busbar assembly product assembled in step S1 in the installation area 2, wherein the copper busbar pins on the left and right sides cooperate with the upper surfaces of the corresponding push rods, so that the copper busbar pins of the nanocrystalline product are lifted up by the eight push rods in the hot riveting carrier, and the clamping blocks 3 on the front and rear sides clamp the nanocrystalline copper busbar assembly product, and then cover the upper cover 16 according to the position of the positioning column, and then fasten and lock the buckles on the front and rear sides to keep the copper busbar pins on the same surface;

[0061] S3: Put the nanocrystalline copper busbar product and the hot riveting jig after being fixed and limited in step S2 into the carrier of the pulse hot riveting welding equipment, then turn on the equipment, adjust the carrier in the Z-axis direction to reach the specified position, and then instantly melt and cool the plastic parts in the nanocrystalline copper busbar product through the upper and lower welding heads, so that the copper busbar pins are fixed on the same horizontal plane of the plastic parts;

[0062] S3.1: The first stage: energy 40-50%, pulse heating duration 3s, temperature 360℃,

[0063] ① The vehicle reaches the specified position 161.700mm in the Y-axis direction, and the speed is 60.00mm / s;

[0064] ② The upper 4 welding heads reach the designated position 122.191mm in the Z-axis direction, with an initial velocity of 60.00mm / s; the lower 2 welding heads reach the designated position 41.950mm in the Z-axis direction, with an initial velocity of 60.00mm / s;

[0065] S3.2: The second stage: energy 50-60%, pulse heating duration 14s, temperature 400°C.

[0066] ①The Y-axis direction remains unchanged

[0067] ② The upper 4 welding heads continue to descend in the Z-axis direction, the buffer speed is 0.150mm / s, and the buffer distance is set to 1.2mm;

[0068] ③ The next two welding heads continue to rise in the Z-axis direction, the buffer speed is 0.150mm / s, and the buffer distance is set to 0.6mm;

[0069] S3.3: The third stage: pressurize and heat welding at the same time, the pressure is 9kg, and the temperature and pressure are kept for 10s;

[0070] S3.4: The fourth stage: Rapid cooling to 110°C, the cooling time is maintained for 6 seconds to allow the plastic part to be fixed;

[0071] S3.5: The fifth stage: Raise the temperature to 185℃ for demoulding, and lift the height up and down by 1mm at the same time to reduce the pulling of plastic parts near the copper busbar pins during demoulding, which will affect the flatness of the copper busbar pins.

[0072] S4: After the copper busbar pins are fixed on the same horizontal plane as the plastic parts in step S3, the front and rear buckles of the hot riveting fixture body 1 are opened to remove the upper cover 16, and then the nanocrystalline copper busbar assembly product is ejected and removed through all the elastic components one and two.

[0073] Flatness test conditions: Place the product after hot riveting in the VR optical inspection equipment to detect the flatness of the 8 pins.

[0074] Depend on Figure 4 It can be observed that the 8 pins of the copper busbar of the nanocrystalline component are fixed in flatness, and the pin coverage and wrapping are good, and the appearance meets the requirements.

[0075] After testing, the flatness of Example 1 is less than 0.1 mm, the flatness is suitable for reflow soldering, and the product is qualified.

[0076] Comparative Example 1

[0077] S1: First, the copper busbar and nanocrystalline components are preliminarily assembled in a common laser welding fixture, and then the I-shaped copper sheet and the U-shaped copper sheet are welded using a laser welding process. After welding, a nanocrystalline copper busbar component product with 4 windings and 8 pin terminals is assembled;

[0078] The welding power of thick copper bar is 80%, the welding process is straight line short distance circular jitter welding, and the jitter radius is controlled at 2.5mm; the welding power of thin copper bar is 60%, the welding process is straight line short distance circular jitter welding, and the jitter radius is controlled at 1mm;

[0079] S2: Place the nanocrystalline copper busbar assembly product assembled in step S1 into the pulse hot riveting welding equipment carrier and fix it, then turn on the equipment, first perform upper hot riveting welding, then take out the product and perform lower hot riveting welding, the temperature is 350°C;

[0080] S3: After step S2 is completed, the front and rear buckles of the hot riveting fixture body 1 are opened to remove the upper cover 16, and then the nanocrystalline copper busbar assembly product is ejected and removed through all the elastic components one and two.

[0081] Flatness test conditions: Place the product after hot riveting in the VR optical inspection equipment to detect the flatness of the 8 pins.

[0082] Depend on Figure 5It can be observed that after the upper and lower hot riveting and hot melting welding, the copper busbar pins are obviously uneven.

[0083] The flatness of comparative example 1 was found to be unqualified after testing, and the average flatness value was greater than 0.5 mm.

[0084] Comparative Example 2

[0085] S1: First, the copper busbar and nanocrystalline components are preliminarily assembled in a laser welding fixture, and then the I-shaped copper sheet and the U-shaped copper sheet are welded using a laser welding process. After welding, a nanocrystalline copper busbar component product with 4 windings and 8 pin terminals is assembled;

[0086] The welding power of thick copper bar is 80%, the welding process is straight line short distance circular jitter welding, and the jitter radius is controlled at 2.5mm; the welding power of thin copper bar is 60%, the welding process is straight line short distance circular jitter welding, and the jitter radius is controlled at 1mm;

[0087] S2: Place the nanocrystalline copper busbar assembly product assembled in step S1 into the pulse hot riveting welding equipment carrier and fix it, then turn on the equipment, first perform upper hot riveting welding, then take out the product and perform lower hot riveting welding, the temperature is 350°C;

[0088] S3: After step S2 is completed, the front and rear buckles of the hot riveting fixture body 1 are opened to remove the upper cover 16, and then the nanocrystalline copper busbar assembly product is ejected and removed through all the elastic components one and two.

[0089] Depend on Figure 6 It can be observed that after the upper and lower hot riveting and hot melting welding, the copper busbar pins are obviously uneven.

[0090] The flatness of comparative example 2 was found to be unqualified after testing, and the average flatness value was greater than 0.3 mm.

[0091] Comparative Example 3

[0092] S1: First, the copper busbar and nanocrystalline components are preliminarily assembled in a laser welding fixture, and then the I-shaped copper sheet and the U-shaped copper sheet are welded using a laser welding process. After welding, a nanocrystalline copper busbar component product with 4 windings and 8 pin terminals is assembled;

[0093] The welding power of thick copper bar is 80%, the welding process is straight line short distance circular jitter welding, and the jitter radius is controlled at 2.5mm; the welding power of thin copper bar is 60%, the welding process is straight line short distance circular jitter welding, and the jitter radius is controlled at 1mm;

[0094] S2: Place the nanocrystalline copper busbar assembly product assembled in step S1 in the installation area 2, wherein the copper busbar pins on the left and right sides cooperate with the upper surfaces of the corresponding push rods, so that the copper busbar pins of the nanocrystalline product are lifted up by the eight push rods in the hot riveting carrier, and the clamping blocks 3 on the front and rear sides clamp the nanocrystalline copper busbar assembly product, and then cover the upper cover 16 according to the position of the positioning column, and then fasten and lock the buckles on the front and rear sides to keep the copper busbar pins on the same surface;

[0095] S3: The nanocrystalline copper busbar product and the hot riveting fixture after being fixed and limited in step S2 are placed in a pulse hot riveting welding equipment carrier and fixed, and then the equipment is turned on, and the upper hot riveting welding is first performed, and then the hot riveting carrier carrying the product is taken out, and then the lower hot riveting welding is performed in another pulse hot riveting welding equipment carrier, and the temperature is 350°C;

[0096] S4: Then, open the front and rear buckles of the hot riveting fixture body 1 to remove the upper cover 16, and then use all the elastic components one and two to push out the nanocrystalline copper busbar assembly product.

[0097] Depend on Figure 7 It can be seen from the observation that after the upper and lower hot riveting and hot melting welding, the unevenness of the copper busbar pins has been significantly improved.

[0098] The flatness of comparative example 3 was found to be unqualified after testing, and the average flatness value was greater than 0.2 mm.

[0099] Comparative Example 4

[0100] S1: First, the copper busbar and nanocrystalline components are preliminarily assembled in a laser welding fixture, and then the I-shaped copper sheet and the U-shaped copper sheet are welded using a laser welding process. After welding, a nanocrystalline copper busbar component product with 4 windings and 8 pin terminals is assembled;

[0101] The welding power of thick copper bar is 80%, the welding process is straight line short distance circular jitter welding, and the jitter radius is controlled at 2.5mm; the welding power of thin copper bar is 60%, the welding process is straight line short distance circular jitter welding, and the jitter radius is controlled at 1mm;

[0102] S2: Place the nanocrystalline copper busbar assembly product assembled in step S1 in the installation area 2, wherein the copper busbar pins on the left and right sides cooperate with the upper surfaces of the corresponding push rods, so that the copper busbar pins of the nanocrystalline product are lifted up by the eight push rods in the hot riveting carrier, and the clamping blocks 3 on the front and rear sides clamp the nanocrystalline copper busbar assembly product, and then cover the upper cover 16 according to the position of the positioning column, and then fasten and lock the buckles on the front and rear sides to keep the copper busbar pins on the same surface;

[0103] S3: The nanocrystalline copper busbar product fixed and limited in step S2 is placed together with the hot riveting fixture into the carrier of the pulse hot riveting welding equipment, and then the equipment is turned on to first perform the upper hot riveting welding, and then the product is taken out and the lower hot riveting welding is performed, and the temperature is 350°C;

[0104] S4: Then, open the front and rear buckles of the hot riveting fixture body 1 to remove the upper cover 16, and then use all the elastic components one and two to push out the nanocrystalline copper busbar assembly product.

[0105] Depend on Figure 8 It can be seen from the observation that after the upper and lower hot riveting and hot melting welding, the unevenness of the copper busbar pins has been significantly improved.

[0106] The flatness of comparative example 4 was found to be unqualified after testing, and the average flatness value was greater than 0.1 mm.

[0107] In the present invention, the laser welding jig is a laser welding jig with a limiting structure; the ordinary welding jig refers to a laser welding jig without a limiting structure.

[0108] It can be seen from Example 1 and Comparative Examples 1-4 that, through the method of the present invention, the copper bar and the nanocrystalline component are first preliminarily assembled in a laser welding fixture, so that the coplanarity of the copper bar pins is less than 0.03 mm, and then the I-type copper sheet and the U-type copper sheet are welded using a laser welding process. After welding, a nanocrystalline copper bar component product with 4 windings and 8 pin terminals is assembled, and then the nanocrystalline copper bar component product is installed in the hot riveting fixture of the present invention for fixed positioning, so that the coplanarity of the copper bar pins of the product is maintained at less than 0.03 mm. The nanocrystalline copper bar product after fixed positioning is placed in a pulse hot riveting welding equipment carrier together with the hot riveting fixture for fixing, and then the equipment is turned on, and the carrier is adjusted to a specified position in the Z-axis direction, and then the plastic parts in the nanocrystalline copper bar product are instantly hot-melted and cooled through the upper and lower welding heads, so that the copper bar pins are fixed on the same horizontal plane of the plastic parts, and the copper bar pins are fixed on the same horizontal plane of the plastic parts. Then, the nanocrystalline copper bar product is demolded to obtain a nanocrystalline component with a copper bar pin flatness of less than 0.1 mm.

Claims

1. A hot riveting jig, characterized in that The invention comprises a hot riveting jig body (1), wherein a cavity is provided inside the hot riveting jig body (1), wherein a mounting area (2) for a nanocrystalline copper busbar assembly product is provided at the center of the cavity, and push rod assemblies for making the copper busbar pins of the nanocrystalline copper busbar assembly product be in the same plane are symmetrically provided on the left and right sides of the mounting area (2), the bottom of the push rod assembly is fixed on a bottom plate (4) of the riveting jig body (1), and the upper surfaces of the push rod assemblies on both sides are at the same height, and two clamping blocks (3) are symmetrically provided on the front and rear sides of the mounting area (2), and the clamping blocks (3) are fixed on the bottom plate (4) of the riveting jig body (1).

2. A hot riveting jig according to claim 1, characterized in that The push rod assembly comprises push rod one (5), push rod two (6), push rod three (7) and push rod four (8) which are arranged in sequence from top to bottom, each push rod has an elastic component one on its outer surface facing outward, and each clamping block (3) has an elastic component two on its outer surface facing outward, wherein all the elastic components one and two elastic components two constitute a demoulding mechanism for demoulding a nanocrystalline copper busbar assembly product.

3. A hot riveting jig according to claim 2, characterized in that The elastic component 1 comprises a mounting disc 1 (9) and a spring 1 (10), wherein the mounting disc 1 (9) is fixed to the lower outer surface of the corresponding push rod, one end of the spring 1 (10) is mounted on the mounting disc 1 (9), and the other end of the spring 1 (10) is mounted in a mounting groove 1 correspondingly provided on the upper surface of the bottom plate (4).

4. A hot riveting jig according to claim 2, characterized in that The second elastic component comprises a second mounting disc (11) and a second spring (12); the second mounting disc (11) is mounted on the clamping block (3); one end of the second spring (12) is mounted on the second mounting disc (11); and the other end of the second spring (12) is mounted in a second mounting groove correspondingly provided on the upper surface of the base plate (4).

5. The hot riveting jig according to claim 1, characterized in that A first positioning column (13) is provided on the left side of the installation area (2), and a second positioning column (14) and a third positioning column (15) are provided on the right side thereof from top to bottom. The first positioning column (13) and the second positioning column (14) are both passed through the hot riveting jig body (1) and fixed on the bottom plate (4). The third positioning column (15) is fixed in the side portion of the riveting jig body (1) having thickness.

6. The hot riveting jig according to claim 1, characterized in that An upper cover (16) is provided at the upper end of the heat riveting jig body (1), the upper cover (16) is connected to a buckle (18) via a rotating shaft (19), the lower end of the buckle (18) is buckled onto a bottom plate (4), and the heat riveting jig body (1) and the bottom plate (4) are fixedly connected via a fastening screw (17).

7. A method for hot riveting copper bar pin flatness fixation process for nanocrystalline products suitable for industrial production, characterized in that The hot riveting jig is a hot riveting jig according to any one of claims 1 to 6; and comprises the following specific steps: S1: First, the copper busbar and nanocrystalline components are preliminarily assembled in a laser welding fixture, and then the I-shaped copper sheet and the U-shaped copper sheet are welded using a laser welding process. After welding, a nanocrystalline copper busbar component product with 4 windings and 8 pin terminals is assembled; S2: Fixing the nanocrystalline copper busbar assembly product assembled in step S1 in the hot riveting fixture so that the copper busbar pins are on the same surface; S3: Put the nanocrystalline copper busbar product and the hot riveting jig after being fixed and limited in step S2 into the carrier of the pulse hot riveting welding equipment, then turn on the equipment, adjust the carrier in the Z-axis direction to reach the specified position, and then instantly melt and cool the plastic parts in the nanocrystalline copper busbar product through the upper and lower welding heads, so that the copper busbar pins are fixed on the same horizontal plane of the plastic parts; S4: After the copper busbar pins are fixed on the same horizontal plane of the plastic part in step S3, the nanocrystalline copper busbar product is demoulded to obtain a nanocrystalline component with a copper busbar pin flatness of less than 0.1 mm.

8. The method for hot riveting copper bar pin flatness of nanocrystalline products suitable for industrial production according to claim 7, characterized in that In step S1, the copper bar and the nanocrystalline component are preliminarily assembled in a laser welding fixture, and the coplanarity of the copper bar pins is less than 0.03 mm; in step S1, the welding power of the thick copper bar is 80%, the welding process is straight-line short-distance circular jitter welding, and the control jitter radius is 2.5 mm; the welding power of the thin copper bar is 60%, the welding process is straight-line short-distance circular jitter welding, and the control jitter radius is 1 mm; The specific process of step S2 is as follows: The nanocrystalline copper busbar assembly product assembled in step S1 is placed in the installation area (2), wherein the copper busbar pins on the left and right sides cooperate with the upper surfaces of the corresponding push rods, so that the copper busbar pins of the nanocrystalline product are lifted up by the eight push rods in the hot riveting carrier, and the clamping blocks (3) on the front and rear sides clamp the nanocrystalline copper busbar assembly product, and then the upper cover (16) is covered according to the position of the positioning column, and then the front and rear side buckles are fastened and locked to keep the copper busbar pins on the same surface.

9. The method for hot riveting copper bar pin flatness of nanocrystalline products suitable for industrial production according to claim 7, characterized in that The specific process of step S3 is as follows: S3.1: The first stage: the energy is 40-50%, the pulse heating duration is 2-3s, and the temperature is 350-370℃; ① The vehicle reaches the specified position 161.700mm in the Y-axis direction, and the speed is 60.00mm / s; ② The upper 4 welding heads reach the designated position 122.191mm in the Z-axis direction, with an initial velocity of 60.00mm / s; ③ The Z-axis direction of the next two welding heads reaches the specified position of 41.950mm, and the initial speed is 60.00mm / s; S3.2: The second stage: the energy is 50-60%, the pulse heating duration is 12-15s, and the temperature is 390-410℃; ①The specified position in the Y-axis direction remains unchanged; ② The upper 4 welding heads continue to descend in the Z-axis direction, the buffer speed is 0.150mm / s, and the set buffer distance is 1.2mm; ③ The next two welding heads continue to rise in the Z-axis direction, the buffer speed is 0.150mm / s, and the buffer distance is set to 0.6mm; S3.3: Pressurize and heat the upper and lower welding heads at the same time, with a pressure of 8-10kg, and keep the temperature and pressure for 10s; S3.4: Rapidly cool to 100-120°C, and keep the cooling time for 5-7s to allow the plastic part to be fixed; S3.5: Raise the temperature to 150-200℃ for demoulding, and at the same time, lift the upper and lower welding heads by 1mm to reduce the pulling of plastic parts near the copper busbar pins during demoulding, which will affect the flatness of the copper busbar pins.

10. The method for hot riveting copper bar pin flatness of nanocrystalline products suitable for industrial production according to claim 7, characterized in that Step S4: The demoulding process of the nanocrystalline copper busbar product is as follows: First, open the buckles (18) on the front and rear sides of the hot riveting fixture body (1) to remove the upper cover (16), and then use all the elastic components one and two to push out the nanocrystalline copper busbar assembly product and remove it.

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