A heat sink lamination welding apparatus and assembly method

Abstract

The present application relates to the technical field of automatic installation and welding of heat dissipation plates, and discloses a heat dissipation plate bonding and welding device and an assembling method, which comprises a rack, an annular double-layer reflow jig conveying line, a jig opening and closing assembly, a secondary positioning assembly, a bonding workstation, a product grabbing assembly, a welding and pressing protection assembly and an ultrasonic welding assembly; the annular double-layer reflow jig conveying line realizes automatic reflow of a carrier; the jig opening and closing assembly and the secondary positioning assembly form two-stage positioning and deviation correction; the bonding workstation completes protection film bonding; the product grabbing assembly completes cover plate buckling and finished product discharging; the welding and pressing protection assembly and the ultrasonic welding assembly complete ultrasonic welding by upwardly and downwardly abutting each other; the present application has high positioning precision, can avoid workpiece deformation caused by pressure during welding, realizes full-process automatic operation, and improves production efficiency and product yield.

Description

Technical Field

[0001] This invention relates to the field of automated installation and welding machinery for heat sinks, specifically to a heat sink bonding and welding equipment and assembly method. Background Technology

[0002] As the power of electronic devices continues to increase, the demand for heat sinks continues to grow. Finished heat sinks require sequential steps of protective film application, cover plate fastening, and ultrasonic welding. Early processing methods used multiple independent machines, with separate equipment for film application, cover plate installation, and ultrasonic welding. Workpieces relied on manual transfer, resulting in large repetitive positioning errors and low production efficiency. The industry is gradually upgrading to automated production lines, which fall into two categories: the first is a standard unidirectional conveyor line where the carrier is transported in one direction, requiring manual repositioning of the empty carrier back to the loading end after processing; the second, a few lines with return flow capabilities, only achieve physical return of the carrier, lacking a graded positioning and correction structure.

[0003] For example, Chinese patent application number CN202322660834.2 discloses a device for improving the operating efficiency of ultrasonic automatic welding equipment, including a circulating fixture mechanism. The circulating fixture mechanism is equipped with several battery cell support fixtures, and welding seats are installed below the battery cell support fixtures. Several welding machines are provided on the side of the circulating fixture mechanism. A welding head is provided on one side of the welding machine through a guide rail assembly, and the welding head is connected to a drive component that is set on the welding machine and can drive the welding head to move up and down. This patent only relies on the fixture itself to achieve workpiece positioning, without setting an independent pre-clamping + secondary correction two-stage positioning mechanical structure. The workpiece will have displacement and angular cumulative deviation during the circulation process of the circulating fixture, which cannot meet the high-precision positioning requirements of the film application process, and is prone to film application misalignment. Ultrasonic welding is prone to incomplete welding and misaligned welding, and the positioning accuracy is not high. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a heat sink bonding and welding equipment and assembly method, which has the advantages of high positioning accuracy, easy deformation of ultrasonically welded workpieces under pressure, automatic reflow of the carrier, and good coordination between workstations in each process. It solves the problems of insufficient single-stage positioning accuracy, easy deformation of ultrasonically welded workpieces under pressure, inability of carriers to automatically reflow, and poor coordination between workstations in existing heat sink production lines.

[0005] To achieve the aforementioned objectives of high positioning accuracy, minimal deformation of ultrasonically welded workpieces under pressure, automatic recirculation of the carrier, and good coordination among various process stations, this invention provides the following technical solution: A heat sink bonding welding device, comprising a frame, a ring-shaped double-layer recirculation fixture conveyor line, a fixture opening and closing assembly, a secondary positioning assembly, a bonding workstation, a product gripping assembly, a welding pressing protection assembly, and an ultrasonic welding assembly. The ring-shaped double-layer recirculation fixture conveyor line is fixedly installed on the frame. The fixture opening and closing assembly and the secondary positioning assembly are sequentially fixed to the frame along the flow direction of the ring-shaped double-layer recirculation fixture conveyor line. The bonding workstation is mounted on the frame and located downstream of the secondary positioning assembly. The product gripping assembly spans above the frame. The ultrasonic welding assembly is slidably installed on the frame. The welding pressing protection assembly is vertically slidably connected to the frame and located directly below the welding head of the ultrasonic welding assembly. The support surface of the welding pressing protection assembly is vertically aligned with the welding head of the ultrasonic welding assembly.

[0006] Preferably, the annular double-layer reflux fixture conveyor line includes a two-end reversing and transfer mechanism, a station blocking and positioning unit, and a carrier fixture; the two-end reversing and transfer mechanism is respectively disposed at the beginning and end of the annular double-layer reflux fixture conveyor line; the station blocking and positioning unit is fixed at intervals to the frame along the flow path of the conveyor line; the carrier fixture is slidably installed on the annular double-layer reflux fixture conveyor line; and the two-end reversing and transfer mechanism is used to realize the switching displacement of the carrier fixture between the upper processing channel and the lower reflux channel on the conveyor line.

[0007] Preferably, the fixture opening and closing assembly includes a bottom lifting mechanism, a middle drive unit, and two side grippers; the bottom lifting mechanism is vertically fixed to the frame, the middle drive unit is installed at the lifting output end of the bottom lifting mechanism, and the two side grippers are symmetrically slidably installed on the middle drive unit. The two side grippers can synchronously close towards each other or open in the opposite direction, and the clamping area of ​​the two side grippers is vertically aligned with the workpiece bearing position of the fixture.

[0008] Preferably, the secondary positioning component is fixed to the frame and cooperates with the lifting operation height of the bottom lifting mechanism; the secondary positioning component is provided with two sets of independent positioning stations, and the two sets of positioning stations are vertically aligned with the two workpiece bearing positions of the carrier fixture respectively; the positioning end of the secondary positioning component can perform position and angle correction constraints on the workpiece after it is pre-clamped by the fixture opening and closing component.

[0009] Preferably, the bonding workstation includes an upper XY transfer module, a Z-axis lifting slide, a vacuum adsorption head, a dual-servo lifting cylinder, and a rotary fine-tuning base; the upper XY transfer module is horizontally fixed to the frame, the Z-axis lifting slide is slidably mounted on the upper XY transfer module, and the vacuum adsorption head is fixed to the lower end of the Z-axis lifting slide; the dual-servo lifting cylinder is vertically fixed to the frame, and the rotary fine-tuning base is rotatably mounted on the output end of the dual-servo lifting cylinder, with the bearing surface of the rotary fine-tuning base vertically aligned with the pressing end of the vacuum adsorption head.

[0010] Preferably, the bonding workstation further includes two sets of side-mounted locking mechanisms; the two sets of side-mounted locking mechanisms are symmetrically arranged on the left and right sides of the rotary fine-tuning base, and the locking end of the side-mounted locking mechanism can extend and retract toward the workpiece bearing area of ​​the rotary fine-tuning base to form a lateral locking constraint on the fine-tuned workpiece.

[0011] Preferably, the product gripping assembly includes a gantry frame, an X-axis moving module, a Z-axis lifting drive, and grippers; the gantry frame is fixedly mounted on the top of the machine frame, the X-axis moving module is slidably mounted on the gantry frame beam, the Z-axis lifting drive is fixed to the sliding seat of the X-axis moving module, and the grippers are fixed to the output end of the Z-axis lifting drive; the movement stroke of the grippers covers the material position on the cover plate, the bonding workstation, and the ultrasonic welding component workstation.

[0012] Preferably, the welding pressing protection assembly includes a support frame and a contoured support block; the support frame is vertically fixed to the machine frame, and the contoured support block is vertically slidably installed on the support frame. The contoured support block can slide upward to the bottom of the workpiece and form a vertical top-to-top support structure with the welding head of the ultrasonic welding assembly.

[0013] Preferably, the ultrasonic welding assembly includes an XY servo base, an ultrasonic main unit, and a Z-axis servo welding head mechanism; the XY servo base is horizontally slidably mounted on the frame, the ultrasonic main unit is fixedly mounted on the upper end of the XY servo base, and the Z-axis servo welding head mechanism is vertically mounted on the ultrasonic main unit, with the welding head of the Z-axis servo welding head mechanism precisely aligned vertically with the contour support block.

[0014] A heat sink bonding and welding assembly method, applied to the aforementioned heat sink bonding and welding equipment, includes the following steps: S1. The carrier fixture carries the heat dissipation plate and flows along the annular double-layer return fixture conveyor line. The station blocking and positioning unit limits the carrier fixture. The bottom lifting mechanism lifts the workpiece. The middle drive unit drives the two side grippers to close to complete the pre-clamping of the workpiece. S2. The carrier fixture is transferred to the secondary positioning component station, where the secondary positioning component completes secondary position and angle correction positioning of the pre-clamped workpiece. S3. The XY transfer module of the bonding workstation drives the vacuum adsorption pressure head to pick up the film, the Z-axis lifting slide presses down to complete the bonding of the film material on the heat sink surface, the rotating fine adjustment base adjusts the workpiece posture, and the side-standing locking mechanism locks the workpiece. S4. The grippers of the product gripping component grip the cover plate and transfer it to the surface of the heat sink. S5. The carrier fixture is transferred to the welding station. The top of the workpiece is supported by the contour support block. The Z-axis servo welding head mechanism moves down to complete the ultrasonic welding pressure holding operation. S6. The welding head and contour support block are reset, the grippers release the workpiece, the product gripping component grips the finished product and unloads it, and the carrier fixture returns to circulation via the reversing transfer mechanism.

[0015] Compared with the prior art, the present invention provides a heat sink bonding and welding device and assembly method, which has the following beneficial effects: 1. This heat sink bonding welding equipment and assembly method utilizes a two-stage positioning structure—pre-clamping and secondary correction—through the cooperation of a fixture opening and closing component and a secondary positioning component. The fixture opening and closing component first performs initial clamping and limiting of the incoming heat sink, while the secondary positioning component precisely corrects the workpiece's planar position and deflection angle, eliminating the cumulative positional and angular deviations generated during the flow of the carrier fixture on the annular double-layer return fixture conveyor line. This two-stage positioning collaboration can control the workpiece positioning accuracy within ±0.03mm, avoiding misalignment problems during subsequent protective film bonding, and improving the defects of misaligned welding and incomplete welding during ultrasonic welding, thus solving the problem of insufficient accuracy in traditional single-stage positioning.

[0016] 2. The heat sink welding equipment and assembly method utilize a welding pressure protection component that works in conjunction with the vertical top-support structure of the ultrasonic welding component. During ultrasonic welding, the contoured support block lifts the heat sink from the bottom of the workpiece, forming a rigid top-to-bottom alignment with the upper Z-axis servo welding head mechanism. This distributes the welding pressure across both mechanisms, preventing the thin-walled heat sink from being solely subjected to downward pressure from the upper welding head, which could lead to dents or warping. The contoured support block matches the bottom surface of the workpiece, ensuring uniform transmission of ultrasonic energy to the welding joint surface. This enhances the weld strength between the cover plate and the heat sink, reducing the workpiece damage and scrap rate.

[0017] 3. The heat sink bonding welding equipment and assembly method utilize a ring-shaped double-layer return fixture conveyor line coupled with a two-end reversing transfer mechanism to achieve a fully automated closed-loop circulation of the fixture. The upper flow channel completes all workpiece processing steps, and the empty fixture after processing is switched to the lower return flow channel via the two-end reversing transfer mechanism, automatically returning to the equipment's loading start position. This eliminates the need for manual handling of empty fixtures, reduces manual intervention, and improves the continuous production utilization rate of the equipment.

[0018] 4. This heat sink bonding and welding equipment and assembly method integrates pre-clamping, secondary positioning, film bonding, cover plate fastening, ultrasonic welding, and finished product unloading onto the frame. A single product gripping mechanism simultaneously achieves cover plate loading and fastening and finished product unloading. Each station is arranged sequentially along the conveyor line, with tight process logic and coordinated action between stations. This reduces workpiece transfer time between multiple machines, shortens the overall processing cycle, improves overall production line efficiency, and addresses the problem of poor coordination between stations in traditional solutions. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the opening and closing assembly structure of the fixture of the present invention; Figure 3 This is a schematic diagram of the secondary positioning component structure of the present invention; Figure 4 This is a schematic diagram of the workstation structure of the present invention; Figure 5 This is a schematic diagram of the gripping component structure of the product of the present invention; Figure 6 This is a schematic diagram of the welding press protection component of the present invention; Figure 7 This is a schematic diagram of the ultrasonic welding assembly structure of the present invention.

[0020] In the diagram: 1. Frame; 2. Circular double-layer return jig conveyor line; 21. Two-end reversing transfer mechanism; 22. Station blocking and positioning unit; 23. Carrier jig; 3. Jig opening and closing assembly; 31. Bottom lifting mechanism; 32. Middle drive unit; 33. Two-side grippers; 4. Secondary positioning assembly; 41. Positioning station; 5. Fitting workstation; 51. Upper XY transfer module; 52. Z-axis lifting slide; 53. Vacuum adsorption pressure head; 54. Dual servo lifting cylinder; 55. Rotary fine-tuning base; 56. Side-mounted locking mechanism; 6. Product gripping assembly; 61. Gantry frame; 62. X-axis moving module; 63. Z-axis lifting drive component; 64. Gripper; 7. Welding pressing protection assembly; 71. Support frame; 72. Contouring support block; 8. Ultrasonic welding assembly; 81. XY servo base; 82. Ultrasonic main unit; 83. Z-axis servo welding head mechanism. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figure 1 and Figure 6 and Figure 7 As shown, a heat sink bonding and welding equipment includes a frame 1, a ring-shaped double-layer reflux fixture conveyor line 2, a fixture opening and closing assembly 3, a secondary positioning assembly 4, a bonding workstation 5, a product gripping assembly 6, a welding pressing protection assembly 7, and an ultrasonic welding assembly 8. The ring-shaped double-layer reflux fixture conveyor line 2 is fixedly installed on the frame 1. The fixture opening and closing assembly 3 and the secondary positioning assembly 4 are sequentially fixed to the frame 1 along the flow direction of the ring-shaped double-layer reflux fixture conveyor line 2. The bonding workstation 5 is mounted on the frame 1 and located downstream of the secondary positioning assembly 4. The product gripping assembly 6 is positioned across the top of the frame 1. The ultrasonic welding assembly 8 is slidably installed on the frame 1. The welding pressing protection assembly 7 is vertically slidably connected to the frame 1 and located directly below the welding head of the ultrasonic welding assembly 8. The support surface of the welding pressing protection assembly 7 is vertically aligned with the welding head of the ultrasonic welding assembly 8. The entire machine uses the frame 1 as the mounting base, housing the feeding, pre-clamping, and... The entire process, including secondary positioning, membrane bonding, cover plate fastening, ultrasonic welding, and finished product unloading, is integrated into a functional module layout. The circular double-layer reflux fixture conveyor line 2 enables automatic circulation of the carrier. The fixture opening and closing component 3 and the secondary positioning component 4 form a two-level positioning constraint to eliminate workpiece displacement deviation during the flow process. The welding station uses welding pressure protection component 7 and ultrasonic welding component 8 for top-bottom support, ensuring balanced welding force and preventing deformation of the thin-walled heat sink under pressure. Each station is arranged sequentially along the conveyor line, with close process connections, realizing integrated automated operation of heat sink membrane bonding, cover fastening, and ultrasonic welding, reducing manual handling and improving the consistency of the entire line processing.

[0023] like Figure 1 As shown, the annular double-layer reflux fixture conveyor line 2 includes a two-end reversing and transfer mechanism 21, a station blocking and positioning unit 22, and a fixture 23. The two-end reversing and transfer mechanism 21 is respectively set at the beginning and end of the annular double-layer reflux fixture conveyor line 2. The station blocking and positioning unit 22 is fixed at intervals to the frame 1 along the flow path of the conveyor line. The fixture 23 is slidably installed on the annular double-layer reflux fixture conveyor line 2. The two-end reversing and transfer mechanism 21 is used to realize the switching displacement of the fixture 23 between the upper processing flow channel and the lower reflux flow channel on the conveyor line. The upper flow channel is responsible for the processing of each process of the workpiece, and the lower flow channel realizes the automatic return of the empty fixture 23 without the need for manual handling of the fixture to return to the loading end. The station blocking and positioning unit 22 can accurately lock the fixture 23 at each working station to ensure the stability of the fixture position when each mechanism is working. The two-end reversing and transfer mechanism 21 completes the switching of the upper and lower flow channels, realizes the closed-loop circulation of the fixture, and improves the equipment utilization rate. The carrier fixture 23 is made of hard aluminum alloy with a hard anodized surface, which is wear-resistant and deformation-resistant. It can support two workpieces at the same time, improving the output efficiency of the equipment.

[0024] like Figure 2As shown, the fixture opening and closing assembly 3 includes a bottom lifting mechanism 31, a middle drive unit 32, and two side grippers 33. The bottom lifting mechanism 31 is vertically fixed to the frame 1. The middle drive unit 32 is installed at the lifting output end of the bottom lifting mechanism 31. The two side grippers 33 are symmetrically slidably installed on the middle drive unit 32. The two side grippers 33 can synchronously close towards each other or open in the opposite direction. The clamping area of ​​the two side grippers 33 is vertically aligned with the workpiece bearing position of the carrier fixture 23. The bottom lifting mechanism 31 adopts a servo electric cylinder. The drive unit has an adjustable output thrust of 0-1200N, which can lift the intermediate drive unit 32 together with the two side grippers 33 to the workpiece clamping height. The intermediate drive unit 32 adopts a synchronous bidirectional slide structure to ensure the synchronous opening and closing of the two side grippers 33 and avoid workpiece displacement caused by single-sided clamping. The gripping heads of the two side grippers 33 are inlaid with polyurethane buffer pads to avoid damaging the heat sink surface when clamping the workpiece. It completes the pre-clamping limit of the transferred workpiece, initially constrains the general position of the workpiece, and provides the basic conditions for the subsequent secondary positioning component 4 to correct the deviation.

[0025] like Figure 3 As shown, the secondary positioning component 4 is fixed to the frame 1 and cooperates with the lifting operation height of the bottom lifting mechanism 31. The secondary positioning component 4 is equipped with two sets of independent positioning stations 41. The two sets of positioning stations 41 are vertically aligned with the two workpiece bearing positions of the carrier fixture 23. The positioning end of the secondary positioning component 4 can perform position and angle correction constraints on the workpiece after pre-clamping by the fixture opening and closing component 3. The two sets of independent positioning stations 41 can simultaneously perform X / Y direction translation correction and angle deflection correction on the two workpieces respectively, eliminating the cumulative position and angle errors caused by the carrier flow and pre-clamping. The positioning end uses wear-resistant POM material positioning blocks, which have moderate rigidity and will not scratch the side of the workpiece. The positioning height matches the height of the workpiece after being lifted by the fixture opening and closing component 3. The two-stage positioning of pre-clamping and secondary correction improves the workpiece positioning accuracy to within ±0.03mm, meeting the requirements of the subsequent high-precision film application process and preventing film misalignment.

[0026] like Figure 4As shown, the bonding workstation 5 includes an upper XY transfer module 51, a Z-axis lifting slide 52, a vacuum adsorption head 53, a dual servo lifting cylinder 54, and a rotary fine-tuning base 55. The upper XY transfer module 51 is horizontally fixed to the frame 1, the Z-axis lifting slide 52 is slidably mounted on the upper XY transfer module 51, and the vacuum adsorption head 53 is fixed to the lower end of the Z-axis lifting slide 52. The dual servo lifting cylinder 54 is vertically fixed to the frame 1, and the rotary fine-tuning base 55 is rotatably mounted on the output end of the dual servo lifting cylinder 54. The bearing surface of the rotary fine-tuning base 55 is vertically aligned with the pressing end of the vacuum adsorption head 53. The upper XY transfer module 51 adopts a ball screw linear module with a repeatability of ±0.02mm, driving the Z-axis lifting slide 52 and vacuum adsorption head 53 to complete the protective film picking and transfer. The vacuum adsorption head 53 has multiple built-in vacuum negative pressure channels with a negative pressure value of -0.06 to 0.09MPa, which stably adsorbs the protective film. The dual servo lifting cylinder 54 can accurately control the workpiece support height, and the rotating fine-tuning base 55 can rotate at a small angle to compensate for the workpiece angle deviation. Together with the upper vacuum adsorption head 53, it can achieve flat pressing and adhesion of the protective film, reducing bubbles and wrinkles.

[0027] like Figure 4 As shown, the bonding workstation 5 also includes two sets of side-mounted locking mechanisms 56. The two sets of side-mounted locking mechanisms 56 are symmetrically arranged on the left and right sides of the rotary fine-tuning base 55. The locking end of the side-mounted locking mechanism 56 can extend and retract toward the workpiece bearing area of ​​the rotary fine-tuning base 55 to form a lateral locking constraint on the fine-tuned workpiece. After the workpiece has been corrected in posture by the rotary fine-tuning base 55, the two side-mounted locking mechanisms 56 extend synchronously to clamp the workpiece from the side, locking the XY plane position of the workpiece and preventing the workpiece from shifting or deflecting during the film bonding process. The locking end is equipped with an elastic buffer, and the locking pressure is controllable, so as not to squeeze and damage the edge of the heat sink, ensuring the stability of the workpiece posture throughout the film bonding process.

[0028] like Figure 5As shown, the product gripping component 6 includes a gantry frame 61, an X-axis moving module 62, a Z-axis lifting drive 63, and a gripper 64. The gantry frame 61 is fixedly mounted above the frame 1. The X-axis moving module 62 is slidably mounted on the crossbeam of the gantry frame 61. The Z-axis lifting drive 63 is fixed to the sliding seat of the X-axis moving module 62. The gripper 64 is fixed to the output end of the Z-axis lifting drive 63. The movement stroke of the gripper 64 covers the material loading position on the cover plate, the bonding workstation, and the ultrasonic welding component workstation. The gantry frame 61 is made of thick-walled aluminum profile welded and processed, with strong structural rigidity, suppressing high-speed movement vibration. The X-axis moving module 62 and the Z-axis lifting drive 63 are servo driven, and the movement speed and displacement are precisely adjustable. The gripper 64 is a pneumatic parallel gripper with anti-slip buffer pads on the gripper head, which can complete the material handling, transfer, and fastening of the cover plate, as well as the gripping and unloading of the finished product after welding. One set of mechanisms can handle both the material loading of the cover plate and the unloading of the finished product, reducing the number of mechanisms and saving equipment space and cost.

[0029] like Figure 6 As shown, the welding pressing protection assembly 7 includes a support frame 71 and a contoured support block 72. The support frame 71 is vertically fixed to the frame 1, and the contoured support block 72 is vertically slidably installed on the support frame 71. The contoured support block 72 can slide upward to the bottom of the workpiece and form a vertical top-to-top support structure with the welding head of the ultrasonic welding assembly 8. The support frame 71 is formed by bending steel plate and provides vertical movement guidance for the contoured support block 72. The contoured support block 72 is contoured according to the bottom contour of the heat sink and is made of high-strength, high-temperature resistant engineering plastic. During ultrasonic welding, the contoured support block 72 presses upward against the bottom of the workpiece and forms a rigid top-to-top with the welding head above. The welding pressure is borne by the upper and lower mechanisms, which prevents the thin-walled heat sink from being dented or warped by the welding pressure, and reduces the rate of incomplete welding and workpiece pressure damage.

[0030] like Figure 7 As shown, the ultrasonic welding assembly 8 includes an XY servo base 81, an ultrasonic main unit 82, and a Z-axis servo welding head mechanism 83. The XY servo base 81 is horizontally slidably mounted on the frame 1, the ultrasonic main unit 82 is fixedly mounted on the upper end of the XY servo base 81, and the Z-axis servo welding head mechanism 83 is vertically mounted on the ultrasonic main unit 82. The welding head of the Z-axis servo welding head mechanism 83 is precisely aligned vertically with the contour support block 72. The XY servo base 81 can achieve fine-tuning compensation of the welding head's planar position. The ultrasonic main unit 82 has a working power of 2000-3000W and a working frequency of 20kHz, which can achieve stable ultrasonic welding. The Z-axis servo welding head mechanism 83 servo controls the welding pressure, holding time, and downward speed, and the welding parameters are digitally adjustable. The precise alignment of the welding head with the contour support block 72 ensures that the ultrasonic energy is stably transmitted to the welding position, improving the welding strength and reducing defects such as misalignment and incomplete welding.

[0031] A heat sink bonding and welding assembly method, applied to the aforementioned heat sink bonding and welding equipment, includes the following steps: S1. The carrier fixture carries the heat dissipation plate and flows along the annular double-layer return fixture conveyor line. The station blocking and positioning unit limits the carrier fixture. The bottom lifting mechanism lifts the workpiece. The middle drive unit drives the two side grippers to close to complete the pre-clamping of the workpiece. S2. The carrier fixture is transferred to the secondary positioning component station, where the secondary positioning component completes secondary position and angle correction positioning of the pre-clamped workpiece. S3. The XY transfer module of the bonding workstation drives the vacuum adsorption pressure head to pick up the film, the Z-axis lifting slide presses down to complete the bonding of the film material on the heat sink surface, the rotating fine adjustment base adjusts the workpiece posture, and the side-standing locking mechanism locks the workpiece. S4. The grippers of the product gripping component grip the cover plate and transfer it to the surface of the heat sink. S5. The carrier fixture is transferred to the welding station. The top of the workpiece is supported by the contour support block. The Z-axis servo welding head mechanism moves down to complete the ultrasonic welding pressure holding operation. S6. The welding head and contour support block are reset, the grippers release the workpiece, the product gripping component grips the finished product and unloads it, and the carrier fixture returns to circulation via the reversing transfer mechanism.

[0032] The entire method relies on equipment to achieve full-process automation. First, pre-clamping and then secondary correction are used to ensure the accuracy of film application. After film application, the workpiece is locked and then the cover plate is fastened to ensure that the position does not shift. Welding adopts bottom contouring and top support to protect the workpiece from deformation. After processing, the carrier is automatically returned without manual intervention. The process logic is coherent, the cycle time is controllable, and the product processing consistency is high, making it suitable for mass continuous production.

[0033] Working principle: After the equipment is powered on, all mechanisms of the machine perform origin reset. The heat sink is placed on the carrier fixture 23 and conveyed forward by the upper flow channel of the annular double-layer return fixture conveyor line 2. The station blocking and positioning unit 22 stops the carrier fixture 23 at the station of the fixture opening and closing component 3; the bottom lifting mechanism 31 lifts it up, and the middle drive unit 32 drives the two side grippers 33 to close and pre-clamp the heat sink.

[0034] After pre-clamping is completed, the carrier fixture 23 continues to flow to the secondary positioning component 4 station. The two positioning stations 41 respectively correct the position and angle of the two workpieces to eliminate the position deviation caused by the flow.

[0035] The workpiece is transferred to the bonding workstation 5. The upper XY transfer module 51 drives the vacuum adsorption head 53 to pick up the protective film and move it above the workpiece. The Z-axis lifting slide 52 presses down to complete the film application. The rotating fine-tuning base 55 makes fine adjustments and corrections to the workpiece posture, and the side-mounted locking mechanism 56 locks the workpiece laterally.

[0036] The product gripping component 6 operates by gripping the cover plate from the material position on the cover plate and moving it to engage with the heat sink.

[0037] The carrier fixture 23 is transferred to the ultrasonic welding station, and the contour support block 72 of the welding pressure protection component 7 slides upward to support the bottom of the workpiece; the XY servo base 81 of the ultrasonic welding component 8 completes the position calibration, and the Z-axis servo welding head mechanism 83 moves downward, completing the ultrasonic welding pressure holding under the top support of the contour support block 72.

[0038] After welding is completed, the welding head and contour support block 72 reset and release the workpiece; the product gripping component 6 grips the finished product after welding and sends it out of the equipment for unloading; the unloaded carrier fixture 23 is switched into the lower return flow channel through the two-end reversing transfer mechanism 21, and returns to the equipment loading start position to enter the next production cycle.

[0039] In summary, this heat sink bonding and welding equipment and assembly method achieves two-stage positioning and correction through the pre-clamping of the fixture opening and closing component 3 and the secondary positioning component 4, eliminating the cumulative position and angle deviations caused by the carrier flow, ensuring high positioning accuracy, and avoiding film misalignment problems. The welding pressing protection component 7 and the contour support block 72 are vertically aligned with the welding head of the ultrasonic welding component 8, ensuring complete support for the bottom of the workpiece during ultrasonic welding, preventing deformation of the heat sink under pressure, and reducing the occurrence of defects such as incomplete welding and workpiece damage. The annular double-layer return fixture conveyor line 2 automatically switches and returns the upper and lower layers of the carrier fixture 23 using the reversing transfer mechanism 21 at both ends, eliminating the need for manual handling of empty carriers and achieving a high degree of automation. The entire machine integrates pre-clamping, secondary positioning, film bonding, cover plate fastening, ultrasonic welding, and finished product unloading onto the frame 1, with each station working in synergy, smooth process connections, and high production efficiency. This solves the problems of insufficient single-stage positioning accuracy, easy deformation of ultrasonically welded workpieces under pressure, inability of carriers to automatically return, and poor coordination between workstations in existing heat sink production lines.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat sink bonding and welding equipment, comprising a frame (1), a ring-shaped double-layer reflux fixture conveyor line (2), a fixture opening and closing assembly (3), a secondary positioning assembly (4), a bonding workstation (5), a product gripping assembly (6), a welding pressing and protection assembly (7), and an ultrasonic welding assembly (8), characterized in that, The annular double-layer reflux fixture conveyor line (2) is fixedly installed on the frame (1). The fixture opening and closing component (3) and the secondary positioning component (4) are sequentially fixed on the frame (1) along the flow direction of the annular double-layer reflux fixture conveyor line (2). The bonding workstation (5) is mounted on the frame (1) and located downstream of the secondary positioning component (4). The product gripping component (6) is straddling the frame (1). The ultrasonic welding component (8) is slidably installed on the frame (1). The welding pressing protection component (7) is vertically slidably connected to the frame (1) and located directly below the welding head of the ultrasonic welding component (8). The support surface of the welding pressing protection component (7) is vertically aligned with the welding head of the ultrasonic welding component (8).

2. The heat sink bonding and welding equipment according to claim 1, characterized in that: The annular double-layer reflux fixture conveyor line (2) includes a two-end reversing transfer mechanism (21), a station blocking and positioning unit (22), and a carrier fixture (23). The two-end reversing transfer mechanism (21) is respectively set at the beginning and end of the annular double-layer reflux fixture conveyor line (2). The station blocking and positioning unit (22) is fixed at intervals to the frame (1) along the flow path of the conveyor line. The carrier fixture (23) is slidably installed on the annular double-layer reflux fixture conveyor line (2). The two-end reversing transfer mechanism (21) is used to realize the switching displacement of the carrier fixture (23) between the upper processing channel and the lower reflux channel on the conveyor line.

3. The heat sink bonding and welding equipment according to claim 1, characterized in that: The fixture opening and closing assembly (3) includes a bottom lifting mechanism (31), a middle drive unit (32), and two side grippers (33). The bottom lifting mechanism (31) is vertically fixed to the frame (1). The middle drive unit (32) is installed at the lifting output end of the bottom lifting mechanism (31). The two side grippers (33) are symmetrically slidably installed on the middle drive unit (32). The two side grippers (33) can synchronously close towards each other or open in the opposite direction. The clamping area of ​​the two side grippers (33) is vertically aligned with the workpiece bearing position of the carrier fixture (23).

4. The heat sink bonding and welding equipment according to claim 1, characterized in that: The secondary positioning component (4) is fixed to the frame (1) and cooperates with the lifting operation height of the bottom lifting mechanism (31); the secondary positioning component (4) is provided with two independent positioning stations (41), and the two positioning stations (41) are vertically aligned with the two workpiece bearing positions of the carrier fixture (23). The positioning end of the secondary positioning component (4) can perform position and angle correction constraints on the workpiece after it is pre-clamped by the fixture opening and closing component (3).

5. The heat sink bonding and welding equipment according to claim 1, characterized in that: The bonding workstation (5) includes an upper XY transfer module (51), a Z-axis lifting slide (52), a vacuum adsorption head (53), a dual servo lifting cylinder (54), and a rotary fine-tuning base (55). The upper XY transfer module (51) is horizontally fixed to the frame (1), the Z-axis lifting slide (52) is slidably installed on the upper XY transfer module (51), and the vacuum adsorption head (53) is fixed to the lower end of the Z-axis lifting slide (52). The dual servo lifting cylinder (54) is vertically fixed to the frame (1), and the rotary fine-tuning base (55) is rotatably installed on the output end of the dual servo lifting cylinder (54). The bearing surface of the rotary fine-tuning base (55) is vertically aligned with the pressing end of the vacuum adsorption head (53).

6. The heat sink bonding and welding equipment according to claim 5, characterized in that: The bonding workstation (5) also includes two sets of side-mounted locking mechanisms (56); the two sets of side-mounted locking mechanisms (56) are symmetrically arranged on the left and right sides of the rotary fine-tuning base (55). The locking end of the side-mounted locking mechanism (56) can extend and retract toward the workpiece bearing area of ​​the rotary fine-tuning base (55) to form a lateral locking constraint on the fine-tuned workpiece.

7. The heat sink bonding and welding equipment according to claim 1, characterized in that: The product gripping component (6) includes a gantry (61), an X-axis moving module (62), a Z-axis lifting drive (63), and a gripper (64). The gantry (61) is fixedly mounted above the frame (1). The X-axis moving module (62) is slidably mounted on the crossbeam of the gantry (61). The Z-axis lifting drive (63) is fixed to the sliding seat of the X-axis moving module (62). The gripper (64) is fixed to the output end of the Z-axis lifting drive (63). The movement stroke of the gripper (64) covers the material position on the cover plate, the bonding workstation, and the ultrasonic welding component workstation.

8. The heat sink bonding and welding equipment according to claim 1, characterized in that: The welding pressing protection assembly (7) includes a support frame (71) and a contour support block (72); the support frame (71) is vertically fixed to the frame (1), and the contour support block (72) is vertically slidably installed on the support frame (71). The contour support block (72) can slide upward to the bottom of the workpiece and form a vertical top-to-top support structure with the welding head of the ultrasonic welding assembly (8).

9. The heat sink bonding and welding equipment according to claim 1, characterized in that: The ultrasonic welding assembly (8) includes an XY servo base (81), an ultrasonic host (82), and a Z-axis servo welding head mechanism (83). The XY servo base (81) is horizontally slidably mounted on the frame (1), the ultrasonic host (82) is fixedly mounted on the upper end of the XY servo base (81), and the Z-axis servo welding head mechanism (83) is vertically mounted on the ultrasonic host (82). The welding head of the Z-axis servo welding head mechanism (83) is precisely aligned with the contour support block (72).

10. A method for bonding and welding heat sinks, characterized in that, The heat sink bonding and welding equipment according to any one of claims 1-9 includes the following steps: S1. The carrier fixture carries the heat dissipation plate and flows along the annular double-layer return fixture conveyor line. The station blocking and positioning unit limits the carrier fixture. The bottom lifting mechanism lifts the workpiece. The middle drive unit drives the two side grippers to close to complete the pre-clamping of the workpiece. S2. The carrier fixture is transferred to the secondary positioning component station, where the secondary positioning component completes secondary position and angle correction positioning of the pre-clamped workpiece. S3. The XY transfer module of the bonding workstation drives the vacuum adsorption pressure head to pick up the film, the Z-axis lifting slide presses down to complete the bonding of the film material on the heat sink surface, the rotating fine adjustment base adjusts the workpiece posture, and the side-standing locking mechanism locks the workpiece. S4. The grippers of the product gripping component grip the cover plate and transfer it to the surface of the heat sink. S5. The carrier fixture is transferred to the welding station. The top of the workpiece is supported by the contour support block. The Z-axis servo welding head mechanism moves down to complete the ultrasonic welding pressure holding operation. S6. The welding head and contour support block are reset, the grippers release the workpiece, the product gripping component grips the finished product and unloads it, and the carrier fixture returns to circulation via the reversing transfer mechanism.

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