Ultrasonic welding device and welding process for automobile parts

Abstract

The present invention relates to the field of ultrasonic welding technology, and in particular to an ultrasonic welding device and welding process for automotive accessories. In view of the problem that when the existing ultrasonic welding device is used to weld the terminal, the copper wire between the welded part and the unwelded part of the terminal undergoes severe deformation in a short distance and is prone to breakage. It includes: an operating table, the operating table is equipped with an electric mechanical arm; an ultrasonic welding head, which is installed on the electric mechanical arm; a soldering sheet, which is installed on the ultrasonic welding head, and the soldering sheet is in an inverted T shape, and the middle part of the T-shaped horizontal part is squeezed and matched with the ultrasonic welding head. The present invention adds a soldering sheet on the lower side of the ultrasonic welding head to increase a transition area between the welded part and the unwelded part of the terminal, so as to reduce the severity of the deformation of the copper wire between the unwelded part and the welded part of the terminal, thereby increasing the overall tensile strength of the welded part of the terminal.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic welding, and in particular to an ultrasonic welding device and a welding process for automobile parts. Background Art

[0002] With the gradual development of new energy vehicle technology, the number of wires and terminal blocks that need to be welded in the automobile production process has gradually increased. Ultrasonic welding technology is widely used in the production of automotive parts due to its advantages such as fast welding speed and stable electrical performance of the terminal blocks after welding. When welding terminal blocks, existing ultrasonic welding machines usually need to place the terminal blocks on the pads that need to be welded, and then extrude the terminal blocks and the pads through the ultrasonic welding head, and transmit ultrasonic vibrations to the terminal blocks, so that the copper wire in the terminal blocks gradually melts, and the melted copper wire finally condenses into a whole under the extrusion of the ultrasonic welding head. The body is formed by the ultrasonic welding head and bonded to the pad. Because in the above process, only the position where the terminal is squeezed by the ultrasonic welding head melts, and the volume of the welding part of the terminal decreases after melting. When the welding part of the terminal melts and deforms, the connected copper wire is usually pulled in the squeezed direction, causing the copper wire between the non-welding part of the terminal and the welding part of the terminal to bend violently within a short distance. When the welded terminal is pulled, the copper wire between the non-welding part of the terminal and the welding part of the terminal is more likely to break because it has undergone a large degree of deformation, resulting in insufficient reliability of the ultrasonic welding part of the terminal. Summary of the invention

[0003] In order to overcome the disadvantages of the existing ultrasonic welding device that when welding the terminal, the copper wire between the welded part and the unwelded part of the terminal undergoes severe deformation in a short distance and is prone to breakage, the present invention proposes an ultrasonic welding device and a welding process for automobile parts.

[0004] The technical solution of the present invention is: an ultrasonic welding device for automobile accessories, comprising: an operating table, the operating table is equipped with an electric mechanical arm and an electric clamp; an ultrasonic welding head, installed on the electric mechanical arm, used to provide the ultrasonic power required for welding; a soldering sheet, installed on the ultrasonic welding head, the soldering sheet is in an inverted T-shape, and the middle part of the T-shape is squeezed and matched with the ultrasonic welding head to ensure that the ultrasonic wave is stably transmitted to the wiring terminal through the soldering sheet, and the two sides of the T-shape of the soldering sheet are made of flexible metal material, which is convenient for bending and deformation at the T-shape of the soldering sheet, and is used to adapt to the deformation of the wiring terminal and transmit vibration to the wiring terminal.

[0005] Furthermore, a uniformly distributed first guide groove and a symmetrically and uniformly distributed second guide groove are provided on the side of the soldering sheet away from the ultrasonic welding head, and all of the first guide grooves and all of the second guide grooves are located at the level of the T-shape of the soldering sheet, wherein the first guide groove is located in the middle of the horizontal part of the T-shape of the soldering sheet, and the symmetrically distributed second guide grooves are respectively located on both sides of the horizontal part of the T-shape of the soldering sheet, and both the first guide groove and the second guide groove are used to guide adjacent molten metals through extrusion.

[0006] Furthermore, the first guide groove is arranged obliquely to form an inclined protrusion at the welding position of the wiring terminal.

[0007] Further, the width of the second guide groove is smaller than the width of the adjacent first guide groove, and the depth of the second guide groove is greater than the depth of the adjacent first guide groove, the cross-sectional area of ​​the second guide groove is smaller than the cross-sectional area of ​​the adjacent first guide groove, and the second guide groove is connected to the adjacent first guide groove.

[0008] Furthermore, the vertical portion of the T-shaped soldering sheet is provided with symmetrically distributed mounting holes, and the mounting holes are arranged obliquely, and the soldering sheet is mounted on the ultrasonic welding head by means of bolts passing through adjacent mounting holes.

[0009] Furthermore, the soldering sheet is provided with symmetrically distributed beam lines near the first guide groove, and the beam lines are used to limit the diffusion range of the squeezed terminal.

[0010] Further, it also includes: a control mechanism for actively controlling the bending deformation of the soldering iron sheet, the control mechanism is arranged on the electric mechanical arm, and the control mechanism includes: a support frame fixed to the electric mechanical arm, the support frame is fixed with a symmetrically distributed fixed block; an electric push rod, having a plurality of symmetrically distributed electric push rods, the electric push rods are installed on the fixed block; a telescopic frame, having a plurality of symmetrically distributed electric push rods, respectively installed on adjacent electric push rods, the telescopic frame is slidably connected with a symmetrically and evenly distributed fixed rod, the fixed rod is rotatably connected with a rotating block, and the symmetrically distributed rotating blocks are slidably connected with an extrusion sheet together; a connecting plate, having two symmetrically distributed, the two connecting plates are respectively fixed to both sides of the T-shaped horizontal position of the soldering iron sheet, the extrusion sheet is fixed to the adjacent connecting plate, and the connecting plate is made of a flexible material, and is used to reduce the influence of ultrasonic vibration on the soldering iron sheet on the adjacent extrusion sheet.

[0011] Furthermore, a connecting shaft is installed between two adjacent extrusion sheets on the same telescopic frame, and the maximum rotation angle of the connecting shaft is 15°, which is used to limit the maximum rotation angle between two adjacent extrusion sheets.

[0012] Furthermore, it also includes: an extrusion component, which has several groups of symmetrically distributed extrusion components for controlling the deformation of adjacent T-shaped horizontal parts of the soldering sheets in the width direction, and the extrusion components are installed on adjacent telescopic frames. The extrusion component includes: a limit plate, which has several evenly distributed ones, and the limit plates are slidably connected to adjacent and symmetrically distributed fixing rods, and an elastic member is fixedly connected between the fixing rods and the adjacent limit plates, and a connecting block is fixedly connected to the side of the limit plate close to the adjacent extrusion sheet, and the connecting block is extruded and matched with the adjacent extrusion sheet, and the extrusion sheet is made of flexible metal material to facilitate the bending and deformation of the extrusion sheet in its own length direction; a limit strip, which has several evenly distributed ones, one of which is fixedly connected to the ultrasonic welding head, and the other limit strips are respectively fixedly connected to adjacent limit plates, and the limit plate is provided with a groove, and the limit strip and the groove of the adjacent and non-fixed limit plate are limitedly matched.

[0013] Furthermore, an ultrasonic welding process for automobile parts is applied to the above-mentioned ultrasonic welding device for automobile parts, and specifically includes the following steps:

[0014] S1: Install the wiring terminal and the gasket on the electric clamp, and start the electric clamp;

[0015] S2: Control the electric mechanical arm to drive the ultrasonic welding head to move downward, and the ultrasonic welding head drives the soldering sheet to move downward together, and the soldering sheet squeezes the wiring terminal and transmits ultrasonic vibration to the wiring terminal, so that the copper wire in the wiring terminal is melted;

[0016] S3: adjusting the length of the electric push rod according to the distance that the soldering sheet presses the terminal downward, and the electric push rod drives the adjacent telescopic frame to move, thereby adjusting the bending degree of the adjacent parts of the adjacent soldering sheets, so as to form a transition area between the welding part and the non-welding part of the terminal;

[0017] S4: By controlling the telescopic end of the electric push rod that does not need to form a transition area to move, the adjacent extrusion sheets and the adjacent connection blocks are released from the mutual extrusion state, thereby causing the adjacent parts of the adjacent extrusion sheets and the soldering sheets to bend, and causing the molten material at the welding position of the terminal to flow to the transition area;

[0018] S5: After the welding is completed, the electric mechanical arm drives the ultrasonic welding head to move upward and reset, and controls the electric clamp to release the wiring terminal.

[0019] The beneficial effects of the present invention are as follows: the present invention adds a soldering sheet on the lower side of the ultrasonic welding head, thereby adding a transition area between the welded portion and the unwelded portion of the terminal, so as to reduce the severity of the deformation of the copper wire between the unwelded portion and the welded portion of the terminal, thereby increasing the overall tensile strength of the welded portion of the terminal.

[0020] The present invention actively controls the soldering sheet to deform through components such as an electric push rod, thereby assisting the soldering sheet to deform evenly, ensuring the beauty and firmness of the transition area of ​​the wiring terminal, and increasing the reliability of the device.

[0021] The present invention controls whether transition areas are formed on both sides of the wiring terminal through the cooperation between the limit plate and the adjacent limit strips, and when only one transition area needs to be formed, the firmness of the other transition area is enhanced by hindering the formation of the transition area on the other side, thereby increasing the types of different situations that the device can cope with and increasing the scope of application of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a three-dimensional structural schematic diagram of the ultrasonic welding head, the soldering sheet and the supporting frame of the present invention;

[0024] Figure 3 It is a three-dimensional structural schematic diagram of the ultrasonic welding head, the soldering sheet and the fixing block of the present invention;

[0025] Figure 4 is a cross-sectional view of the soldering sheet of the present invention;

[0026] Figure 5 It is a three-dimensional structural schematic diagram of the fixed block, the electric push rod and the telescopic frame of the present invention;

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the soldering sheet, the rotating block and the extrusion sheet of the present invention;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the rotating block, the extrusion sheet and the limiting plate of the present invention.

[0029] The names and serial numbers of the parts in the figure are: 1: operating table, 101: electric mechanical arm, 102: electric clamp, 2: ultrasonic welding head, 3: soldering sheet, 301: first guide groove, 302: second guide groove, 303: mounting hole, 304: beam line, 4: support frame, 5: fixed block, 6: electric push rod, 7: telescopic frame, 8: fixed rod, 9: rotating block, 10: extrusion sheet, 1001: connecting shaft, 11: connecting plate, 12: limiting plate, 1201: elastic part, 13: connecting block, 14: limiting strip. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0031] Because in the process of welding the terminal head and the pad using the existing ultrasonic welding device, the copper wire on the terminal head will melt only at the position squeezed by the ultrasonic welding head, and after the copper wire at this position of the terminal head melts and becomes solid again, its volume will decrease with the squeezing of the ultrasonic welding head. This will cause the copper wire between the unwelded part and the welded part of the terminal head to undergo more drastic deformation during the welding process. When the welding is completed, when the copper wire on the terminal head is pulled, the copper wire connecting the welded part and the unwelded part is likely to break before the welded part of the terminal head, resulting in insufficient reliability of the overall welding part of the terminal head.

[0032] In view of the above problems, the present invention provides an ultrasonic welding device for automobile parts, such as Figure 1-Figure 4 As shown, it includes: an operating table 1, on which an electric mechanical arm 101 and an electric clamp 102 are installed; an ultrasonic welding head 2, which is installed on the electric mechanical arm 101 and is used to provide the ultrasonic power required for welding; a soldering sheet 3, which is installed on the ultrasonic welding head 2, and the soldering sheet 3 is in an inverted T shape, and the middle part of the T-shaped horizontal part is squeezed and matched with the ultrasonic welding head 2 to ensure that the ultrasonic wave is stably transmitted to the wiring terminal through the soldering sheet 3, and the two sides of the T-shaped horizontal part of the soldering sheet 3 are made of flexible metal material, which is convenient for bending and deformation at the T-shaped horizontal part of the soldering sheet 3, so as to adapt to the deformation of the wiring terminal and transmit vibration to the wiring terminal.

[0033] In the above scheme, the electric manipulator 101, the electric clamp 102 and the ultrasonic welding head 2 are all electrical control components. A control terminal electrically connected to the electric manipulator 101, the electric clamp 102 and the ultrasonic welding head 2 is installed on the operating table 1. The staff controls the device to perform specific welding work through the control terminal, wherein the electric manipulator 101 is used to drive the ultrasonic welding head 2 and other components to move up and down. During the welding process, the electric manipulator 101 drives the ultrasonic welding head 2 and the soldering sheet 3 to squeeze the terminal head downward, thereby promoting the melting of the copper wire on the terminal head under the dual effects of ultrasonic vibration and pressure, and forming a whole with uniform pressure distribution on the lower metal gasket to ensure the firmness of the welding. The electric clamp 102 is used to clamp the terminal head and the gasket welded to the terminal head, thereby ensuring the accuracy of the welding position between the terminal head and the gasket.

[0034] The soldering sheet 3 is made of flexible metal and can be bent and deformed in the front and rear directions. During the welding process, when the soldering sheet 3 is squeezed by the ultrasonic welding head 2, the thickness of the soldering sheet 3 does not change, and by tightly squeezing the bottom of the ultrasonic welding head 2 and the soldering sheet 3, the stability of the ultrasonic welding head 2 transmitting ultrasonic vibration through the soldering sheet 3 is ensured. The thickness of the front and rear sides of the T-shaped horizontal part of the soldering sheet 3 is greater than the thickness of the middle part of the T-shaped horizontal part, which is used to increase the resistance of the soldering sheet 3 to the deformation of the T-shaped horizontal part, so that the front and rear sides of the T-shaped horizontal part of the soldering sheet 3 are deformed into a smooth curve, which increases the resistance after welding. Aesthetics: During the welding process, when the terminal is squeezed and welded by the middle of the T-shaped horizontal part of the soldering sheet 3, the front and rear sides of the T-shaped soldering sheet 3 are squeezed by the suspended terminal, and deformation occurs to varying degrees, so that a uniform transition occurs between the deformed and undeformed parts of the terminal. Because the transition area is simultaneously subjected to weaker ultrasonic vibrations transmitted by the adjacent parts of the soldering sheet 3, melting and adhesion occur to varying degrees, which increases the firmness of the connection between different copper wires in the transition area of ​​the terminal, thereby increasing the connection strength between the deformed and undeformed parts of the terminal, and increasing the reliability of welding.

[0035] The specific working process is as follows: the staff first places the gasket and terminal to be welded on the electric clamp 102, and controls the electric clamp 102 to clamp the gasket and terminal to be welded through the control terminal. Then the staff starts the ultrasonic welding head 2 through the control terminal, and the ultrasonic welding head 2 transmits ultrasonic waves to the soldering sheet 3. The staff controls the electric mechanical arm 101 through the control terminal to drive the ultrasonic welding head 2 and other parts to move downward, so that the soldering sheet 3 gradually squeezes the terminal and transmits ultrasonic vibration to the terminal at the same time. The terminal near the middle of the T-shaped soldering sheet 3 is subject to the largest amplitude of ultrasonic vibration and melts the fastest, and gradually sticks under the pressure of the soldering sheet 3. The terminal end stuck on the adjacent gasket and close to the T-shaped end of the soldering sheet 3 is subjected to a smaller amplitude of ultrasonic vibration and a smaller degree of melting. At the same time, because the terminal end is squeezed less by the soldering sheet 3 at this location, a transition area is formed. When the soldering sheet 3 moves downward for a certain period of time, the control terminal automatically controls the electric mechanical arm 101 to drive the ultrasonic welding head 2 to move upward and reset, and closes the ultrasonic welding head 2. The staff removes the terminal end from the electric clamp 102. The terminal end forms a transition area between the welding area and the unwelded area, and the copper wires in the transition area are adhered to each other, so that the tensile strength of the transition area is increased, and the firmness between the terminal end and the gasket after welding is increased.

[0036] Further, if Figure 4As shown, a uniformly distributed first guide groove 301 and a symmetrically and uniformly distributed second guide groove 302 are provided on the side of the soldering sheet 3 away from the ultrasonic welding head 2, and all the first guide grooves 301 and all the second guide grooves 302 are located at the level of the T-shape of the soldering sheet 3, wherein the first guide groove 301 is located in the middle of the horizontal part of the T-shape of the soldering sheet 3, and the symmetrically distributed second guide grooves 302 are respectively located on both sides of the horizontal part of the T-shape of the soldering sheet 3, and both the first guide groove 301 and the second guide groove 302 are used to guide adjacent molten metals by extrusion.

[0037] In the above scheme, a uniformly distributed first guide groove 301 is provided in the middle of the horizontal part of the T-shaped soldering sheet 3 to receive the material produced after the initial melting of the upper side of part of the terminal, thereby promoting the contact between the soldering sheet 3 and the material on the lower side that has not been completely melted, thereby increasing the efficiency of the ultrasonic vibration transmission downward. When the material is squeezed, it flows along the adjacent first guide groove 301. After the welding is completed, the material in the first guide groove 301 solidifies to form a protrusion similar to a reinforcing rib to increase the firmness of the welding part of the terminal. By providing uniformly distributed second guide grooves 302 on both sides of the horizontal part of the T-shaped soldering sheet 3, when the soldering sheet 3 squeezes the transition area of ​​the terminal, the soldering sheet 3 near the welding part of the terminal is relatively The extrusion pressure on the copper wire in the adjacent terminal is relatively large, and the amplitude of vibration transmitted by the soldering sheet 3 at this location to the copper wire in the terminal is relatively large, while the extrusion pressure on the copper wire in the adjacent terminal by the soldering sheet 3 far away from the terminal welding location is relatively small, and the amplitude of vibration transmitted by the soldering sheet 3 at this location to the copper wire in the terminal is relatively small. At this time, the copper wire near the terminal welding location in the transition area of ​​the adjacent terminal is more melted and is subjected to greater extrusion pressure. After the copper wire at this location is melted, it flows toward the location far away from the terminal welding location under the guidance of the adjacent second guide groove 302, and gradually adheres to the unmelted copper wire in the transition area, so that the unmelted copper wires in the transition area are more tightly connected to each other, thereby enhancing the firmness of the transition area of ​​the terminal.

[0038] Further, if Figure 4 As shown, the first guide groove 301 is arranged to be inclined, so as to form an inclined protrusion at the welding position of the wiring terminal.

[0039] In the above scheme, by setting the first guide groove 301 to an inclined state, the rib-like protrusion formed at the welding point of the terminal is inclined. The protrusion not only has excellent resistance to left and right dragging, but also gives the terminal the ability to resist front and back dragging, so that the welding point between the terminal and the gasket forms a more reliable relationship, thereby ensuring the firmness of the welding of the terminal.

[0040] Further, if Figure 4As shown, the width of the second guide groove 302 is smaller than the width of the adjacent first guide groove 301, and the depth of the second guide groove 302 is greater than the depth of the adjacent first guide groove 301, the cross-sectional area of ​​the second guide groove 302 is smaller than the cross-sectional area of ​​the adjacent first guide groove 301, and the second guide groove 302 is connected to the adjacent first guide groove 301.

[0041] In the above scheme, because the second guide groove 302 is connected with the adjacent first guide groove 301, when the soldering sheet 3 and the first guide groove 301 apply pressure to the terminal, part of the molten material at the terminal is guided by the adjacent first guide groove 301 to flow into the second guide groove 302. Subsequently, because the cross-sectional area and width of the second guide groove 302 are smaller than the cross-sectional area and width of the adjacent first guide groove 301, the part of the molten material is squeezed and flows into the copper wire in the transition area, thereby promoting the mutual adhesion and bonding of the copper wires in the transition area. After welding, the remaining material in the second guide groove 302 forms a relatively slender and front-to-back reinforcement rib on the upper side of the terminal, thereby enhancing the overall resistance of the copper wire in the transition area to front-to-back stretching, and further reducing the possibility of copper wire breakage in the transition area of ​​the terminal.

[0042] Further, if Figure 3 and Figure 4 As shown, the vertical portion of the T-shaped soldering sheet 3 is provided with symmetrically distributed mounting holes 303 , and the mounting holes 303 are arranged obliquely. The soldering sheet 3 is mounted on the ultrasonic welding head 2 by means of bolts passing through adjacent mounting holes 303 .

[0043] In the above scheme, by slanting the mounting hole 303, the staff only needs to tighten the bolts in the mounting hole 303 when installing the soldering sheet 3, which is convenient for repairing or replacing the soldering sheet 3. It can not only improve the horizontal clamping force between the soldering sheet 3 and the ultrasonic welding head 2, and ensure the firmness of the connection between the soldering sheet 3 and the ultrasonic welding head 2, but also drag the soldering sheet 3 upward to ensure the squeezing force in the vertical direction between the ultrasonic welding head 2 and the soldering sheet 3, and ensure the reliability of ultrasonic vibration transmission between the two.

[0044] Further, if Figure 3 and Figure 5 As shown, the soldering sheet 3 is provided with symmetrically distributed beam lines 304 near the first guide groove 301 , and the beam lines 304 are used to limit the diffusion range of the squeezed terminal.

[0045] In the above scheme, the wire bundle 304 is installed on the left and right sides of the soldering sheet 3, and is mainly installed on the middle area of ​​the soldering sheet 3 near the T-shaped level. It is used to reduce the tendency of the copper wire of the terminal to diffuse outward due to squeezing when the soldering sheet 3 squeezes the copper wire of the terminal downward, thereby avoiding the copper wire of the terminal from diffusing to the side of the soldering sheet 3, thereby ensuring the effectiveness of the ultrasonic welding process.

[0046] Further, if Figure 2 , Figure 5 and Figure 6 As shown, it also includes: a control mechanism for actively controlling the bending deformation of the soldering sheet 3, the control mechanism is arranged on the electric mechanical arm 101, and the control mechanism includes: a support frame 4, fixed to the electric mechanical arm 101, the support frame 4 is fixed with a symmetrically distributed fixed block 5; an electric push rod 6, having a plurality of symmetrically distributed electric push rods 6, the electric push rod 6 is installed on the fixed block 5; a telescopic frame 7, having a plurality of symmetrically distributed electric push rods, respectively installed on adjacent electric push rods 6, the telescopic frame 7 is slidably connected with a symmetrically and evenly distributed fixed rod 8, the fixed rod 8 is rotatably connected with a rotating block 9, and the symmetrically distributed rotating blocks 9 are slidably connected with an extrusion sheet 10 together; a connecting plate 11, having two symmetrically distributed, the two connecting plates 11 are respectively fixed to the two sides of the T-shaped horizontal part of the soldering sheet 3, the extrusion sheet 10 is fixed to the adjacent connecting plate 11, and the connecting plate 11 is made of a flexible material, which is used to reduce the influence of ultrasonic vibration on the soldering sheet 3 on the adjacent extrusion sheet 10.

[0047] In the above scheme, the electric push rod 6 is an electric control component, the electric push rod 6 is electrically connected to the control terminal, one end of the telescopic frame 7 is fixedly connected to the fixed part of the electric push rod 6, and the other end of the telescopic frame 7 is fixedly connected to the telescopic end of the electric push rod 6. The number of the electric push rod 6 and the telescopic frame 7 can be two, or a plurality of symmetrical ones. The control terminal actively controls the movement of the telescopic end of the electric push rod 6 to control the overall extension or contraction of the telescopic frame 7. The telescopic frame 7 is an existing device, which is mainly used to control the adjacent and evenly distributed fixed rods 8 to move arithmetic differences. Taking the front telescopic frame 7 and adjacent components as an example, the specific movement method is: when the telescopic frame 7 moves Figure 5 When the viewing angle shown is contracted, assuming that the rearmost fixed rod 8 moves upward by h, the second fixed rod 8 from the back to the front moves upward by 2h, and so on, the nth fixed rod 8 from the back to the front moves upward by nh, so that the fixed rod 8 drives the adjacent extrusion sheets 10 to move together, drives the adjacent soldering sheets 3 to deform evenly, forms a smooth curve at the deformation of the soldering sheets 3, and ensures that the transition area of ​​the terminal head extruded by the soldering sheet 3 is more evenly deformed and stressed, thereby ensuring the tensile performance of the transition area of ​​the terminal head.

[0048] By setting the connecting plate 11 to be made of flexible rubber material, the probability of the ultrasonic vibration on the soldering sheet 3 being transmitted to the extrusion sheet 10 can be reduced as much as possible under the premise that the extrusion sheet 10 drives the adjacent parts on the soldering sheet 3 to move, thereby reducing the wear of the extrusion sheet 10 and its components caused by the ultrasonic vibration, thereby increasing the service life of the extrusion sheet 10 and its components.

[0049] The working principle of the above scheme is as follows: when the staff is welding a terminal with a larger diameter, because there are more copper wires in the terminal (more gaps between the copper wires), and the deformation of the copper wire during the welding process is also large, the control terminal adjusts the moving distance of the telescopic ends of the two electric push rods 6 synchronously according to the distance that the soldering sheet 3 squeezes the terminal downward, and when the telescopic end of the electric push rod 6 is extended, it drives the adjacent telescopic frame 7 to retract upward, and the contraction of the telescopic frame 7 drives all adjacent fixed rods 8 to move upward by different distances, and the fixed rod 8 rotates relative to the adjacent rotating block 9, and the rotating block 9 drives the adjacent extrusion sheet 10 to move upward, and the extrusion sheets 10 on the same telescopic frame 7 jointly drive the adjacent soldering sheets 3 to bend into a uniformly distributed curve, thereby ensuring that the transition area of ​​the terminal always maintains a uniform change state, reducing the possibility of large deformation of the copper wire in the transition area of ​​the terminal, and thereby reducing the possibility of the copper wire breaking due to excessive deformation.

[0050] Further, if Figure 6 and Figure 7 As shown, a connecting shaft 1001 is installed between two adjacent extrusion sheets 10 on the same telescopic frame 7 , and the maximum rotation angle of the connecting shaft 1001 is 15°, which is used to limit the maximum rotation angle between two adjacent extrusion sheets 10 .

[0051] In the above scheme, by installing a connecting shaft 1001 between two adjacent extrusion sheets 10, the maximum rotation angle between the two adjacent extrusion sheets 10 is limited in turn, thereby limiting the deformation range of the soldering sheet 3, avoiding the soldering sheet 3 from undergoing transitional deformation, and thus avoiding excessive bending of the transition area of ​​the terminal, which affects the tensile effect of the transition area.

[0052] Further, if Figure 6 and Figure 7 As shown, it also includes: an extrusion component, which has several symmetrically distributed groups, and is used to control the deformation of adjacent soldering sheets 3 in the T-shaped horizontal position in the width direction of the extrusion component. The extrusion component is installed on the adjacent telescopic frame 7. The extrusion component includes: a limit plate 12, which has several evenly distributed ones, and the limit plate 12 is slidably connected to the adjacent and symmetrically distributed fixed rods 8, and an elastic member 1201 is fixedly connected between the fixed rod 8 and the adjacent limit plate 12. A connecting block 13 is fixedly connected to the side of the limit plate 12 close to the adjacent extrusion sheet 10, and the connecting block 13 is extruded and matched with the adjacent extrusion sheet 10. The extrusion sheet 10 is made of flexible metal material, which is convenient for the extrusion sheet 10 to bend and deform in its own length direction; a limit strip 14, which has several evenly distributed ones, and one of the limit strips 14 is fixedly connected to the ultrasonic welding head 2, and the other limit strips 14 are respectively fixedly connected to the adjacent limit plate 12, and the limit plate 12 is provided with a groove, and the limit strip 14 and the groove of the adjacent and non-fixed limit plate 12 are limitedly matched.

[0053] Because there may be a variety of welding situations in the process of welding terminal heads, such as welding two terminal heads together and welding one terminal head to a gasket. When welding the latter, it is obviously not necessary to manufacture transition areas on both sides of the weld at the same time. The above scheme aims to solve the above problems and enhance the types of situations that this scheme can address.

[0054] In the above scheme, the soldering sheet 3 and all the extrusion sheets 10 can be bent and deformed in the left and right directions. The specific deformation rules are as follows: the control terminal controls the soldering sheet 3 to bend and deform in the left and right directions. Figure 5 When the position is bent upward, the limit strip 14 does not cooperate with the corresponding groove on the limit plate 12, but the limit plate 12 is always squeezed and cooperated with the adjacent extrusion sheet 10 through the connecting block 13, thereby ensuring that the adjacent extrusion sheet 10 will not bend and deform in the left and right directions during the upward movement. The soldering sheet 3 needs to manufacture one side of the transition area. The soldering sheet 3 still works according to the above working principle, and the soldering sheet 3 does not need to manufacture one side of the transition area. The control terminal controls the electric push rod 6 to make the soldering sheet 3 on this side bend and deform downward. At this time, the upper limit strip 14 of the ultrasonic welding head 2 first squeezes and limits the adjacent limit plate 12, preventing the limit plate 12 from moving downward with the adjacent fixing rod 8. The adjacent elastic member 1201 is compressed and stored, and the upper limit strip 14 of the limit plate 12 continues to limit the adjacent limit plate 12. Therefore, when the soldering sheet 3 is Figure 5 When the position is bent downward, all the limit plates 12 are restricted to the horizontal position shown in the figure, so all the connecting blocks 13 are no longer squeezed and matched with the adjacent extrusion sheets 10. After the extrusion sheets 10 stop being squeezed by the adjacent connecting blocks 13, they can bend and deform in the left and right directions. At this time, when the soldering sheet 3 squeezes the adjacent wiring terminals, the pressure in the middle is relatively large, and the pressure on the left and right sides is relatively small. Therefore, the soldering sheet 3 and the extrusion sheet 10 are pushed by the adjacent fixing rods 8 and bend downward in the left and right directions. At this time, the width of the second guide groove 302 at this location is further reduced, increasing the resistance to the flow of materials after the lower copper wire is melted, so that after the material at the welding location of the wiring terminal is melted, it flows in another direction with smaller resistance (for example, after the front side of the soldering sheet 3 is bent downward, the material tends to flow to the rear side of the soldering sheet 3), thereby promoting more material to flow to the transition area, thereby increasing the firmness of the wiring terminals in the transition area.

[0055] Furthermore, an ultrasonic welding process for automobile parts is applied to the above-mentioned ultrasonic welding device for automobile parts, and specifically includes the following steps:

[0056] S1: Install the wiring terminal and the gasket on the electric clamp 102, and start the electric clamp 102;

[0057] S2: Control the electric mechanical arm 101 to drive the ultrasonic welding head 2 to move downward, and the ultrasonic welding head 2 drives the soldering sheet 3 to move downward together, and the soldering sheet 3 squeezes the wiring terminal and transmits ultrasonic vibration to the wiring terminal, so that the copper wire in the wiring terminal is melted;

[0058] S3: According to the distance that the soldering sheet 3 squeezes the terminal head downward, the length of the electric push rod 6 is adjusted, and the electric push rod 6 drives the adjacent telescopic frame 7 to move, thereby adjusting the bending degree of the adjacent parts of the adjacent soldering sheets 3, so as to form a transition area between the welding part and the non-welding part of the terminal head;

[0059] S4: By controlling the telescopic end of the electric push rod 6 that does not need to form a transition area to move, the adjacent extrusion sheets 10 and the adjacent connection blocks 13 are released from the mutual extrusion state, thereby causing the adjacent extrusion sheets 10 and the adjacent parts of the soldering sheet 3 to bend, and causing the molten material at the welding position of the terminal to flow to the transition area;

[0060] S5: After the welding is completed, the electric robot arm 101 drives the ultrasonic welding head 2 to move upward and reset, and controls the electric clamp 102 to release the wiring terminal.

[0061] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the contents described in the present invention should be included in the protection scope required by the present invention.

Claims

1. An ultrasonic welding device for automobile parts, characterized in that: Included are: An operating table (1), wherein the operating table (1) is equipped with an electric mechanical arm (101) and an electric clamp (102); An ultrasonic welding head (2) mounted on the electric mechanical arm (101) and used to provide ultrasonic power required for welding; A soldering sheet (3) is mounted on the ultrasonic welding head (2), the soldering sheet (3) is in an inverted T-shape, and the middle of the T-shaped horizontal part is squeezed and matched with the ultrasonic welding head (2), so as to ensure that the ultrasonic wave is stably transmitted to the wiring terminal through the soldering sheet (3), and the two sides of the T-shaped horizontal part of the soldering sheet (3) are made of flexible metal material, so as to facilitate bending and deformation at the T-shaped horizontal part of the soldering sheet (3), so as to adapt to the deformation of the wiring terminal and transmit vibration to the wiring terminal; It also includes: a control mechanism for actively controlling the bending deformation of the soldering sheet (3), the control mechanism being arranged on the electric mechanical arm (101), and the control mechanism including: A support frame (4) fixedly connected to the electric mechanical arm (101), the support frame (4) being fixedly connected with symmetrically distributed fixing blocks (5); An electric push rod (6), comprising a plurality of symmetrically distributed electric push rods (6), wherein the electric push rods (6) are mounted on the fixed block (5); The telescopic frames (7) are provided with a plurality of symmetrically distributed ones, and are respectively mounted on adjacent electric push rods (6); the telescopic frames (7) are slidably connected to symmetrically and evenly distributed fixed rods (8); the fixed rods (8) are rotatably connected to rotating blocks (9); and the symmetrically distributed rotating blocks (9) are slidably connected to an extrusion sheet (10); The connecting plates (11) have two symmetrically distributed ones, the two connecting plates (11) are respectively fixed to two sides of the T-shaped horizontal position of the soldering sheet (3), the extrusion sheet (10) is fixed to the adjacent connecting plates (11), and the connecting plates (11) are made of a flexible material and are used to reduce the influence of ultrasonic vibration on the soldering sheet (3) on the adjacent extrusion sheet (10).

2. The ultrasonic welding device for automobile parts according to claim 1, characterized in that: A side of the soldering sheet (3) away from the ultrasonic welding head (2) is provided with uniformly distributed first guide grooves (301) and symmetrically and uniformly distributed second guide grooves (302), all of the first guide grooves (301) and all of the second guide grooves (302) are located at the level of the T-shape of the soldering sheet (3), wherein the first guide grooves (301) are located in the middle of the T-shape of the soldering sheet (3), and the symmetrically distributed second guide grooves (302) are respectively located on both sides of the T-shape of the soldering sheet (3), and the first guide grooves (301) and the second guide grooves (302) are both used to guide adjacent molten metals by extrusion.

3. The ultrasonic welding device for automobile parts according to claim 2, characterized in that: The first guide groove (301) is arranged obliquely, and is used to form an inclined protrusion at the welding position of the wiring terminal.

4. The ultrasonic welding device for automobile parts according to claim 3, characterized in that: The width of the second guide groove (302) is smaller than the width of the adjacent first guide groove (301), and the depth of the second guide groove (302) is greater than the depth of the adjacent first guide groove (301), the cross-sectional area of ​​the second guide groove (302) is smaller than the cross-sectional area of ​​the adjacent first guide groove (301), and the second guide groove (302) and the adjacent first guide groove (301) are connected to each other.

5. The ultrasonic welding device for automobile parts according to claim 4, characterized in that: The vertical portion of the T-shaped soldering sheet (3) is provided with symmetrically distributed mounting holes (303), and the mounting holes (303) are arranged at an angle, and the soldering sheet (3) is mounted on the ultrasonic welding head (2) by means of bolts passing through adjacent mounting holes (303).

6. The ultrasonic welding device for automobile parts according to claim 5, characterized in that: The soldering sheet (3) is provided with symmetrically distributed beam lines (304) near the first guide groove (301), and the beam lines (304) are used to limit the diffusion range of the squeezed wiring terminal.

7. The ultrasonic welding device for automobile parts according to claim 6, characterized in that: A connecting shaft (1001) is installed between two adjacent extrusion sheets (10) on the same telescopic frame (7), and the maximum rotation angle of the connecting shaft (1001) is 15°, which is used to limit the maximum rotation angle between the two adjacent extrusion sheets (10).

8. The ultrasonic welding device for automobile parts according to claim 7, characterized in that: Also included are: An extrusion assembly having a plurality of symmetrically distributed groups, used for controlling the deformation of the adjacent soldering sheet (3) at the T-shaped level in the width direction, the extrusion assembly being mounted on the adjacent telescopic frame (7), and comprising: The limiting plates (12) are provided with a plurality of evenly distributed limiting plates (12), the limiting plates (12) being slidably connected to the adjacent and symmetrically distributed fixing rods (8), and an elastic member (1201) being fixedly connected between the fixing rods (8) and the adjacent limiting plates (12), and a connecting block (13) being fixedly connected to a side of the limiting plate (12) close to the adjacent extrusion sheet (10), the connecting block (13) being extrusion-matched with the adjacent extrusion sheet (10), and the extrusion sheet (10) being made of a flexible metal material, so that the extrusion sheet (10) can be bent and deformed in its own length direction; The limiting strips (14) are provided with a plurality of evenly distributed ones, wherein one of the limiting strips (14) is fixedly connected to the ultrasonic welding head (2), and the other limiting strips (14) are respectively fixedly connected to adjacent limiting plates (12), wherein the limiting plates (12) are provided with grooves, and the limiting strips (14) are limitedly matched with the grooves of the adjacent limiting plates (12) that are not fixedly connected thereto.

9. An ultrasonic welding process for automobile parts, applied to an ultrasonic welding device for automobile parts as claimed in claim 8, characterized in that: The specific steps include the following: S1: installing the wiring terminal and the gasket on the electric clamp (102), and starting the electric clamp (102); S2: controlling the electric mechanical arm (101) to drive the ultrasonic welding head (2) to move downward, the ultrasonic welding head (2) drives the soldering sheet (3) to move downward together, the soldering sheet (3) squeezes the wiring terminal and transmits ultrasonic vibration to the wiring terminal, causing the copper wire in the wiring terminal to melt; S3: adjusting the length of the electric push rod (6) according to the distance that the soldering sheet (3) presses the terminal head downward, and the electric push rod (6) drives the adjacent telescopic frame (7) to move, thereby adjusting the bending degree of adjacent parts of the adjacent soldering sheets (3), so as to form a transition area between the welding part and the non-welding part of the terminal head; S4: By controlling the telescopic end of the electric push rod (6) that does not need to form a transition area to move, the adjacent extrusion sheets (10) and the adjacent connection blocks (13) are released from the mutually extruded state, thereby causing the adjacent parts of the adjacent extrusion sheets (10) and the soldering sheets (3) to bend, thereby causing the molten material at the welding position of the terminal to flow to the transition area; S5: After welding is completed, the electric mechanical arm (101) drives the ultrasonic welding head (2) to move upward and reset, and controls the electric clamp (102) to release the wiring terminal.

Images