PIN forming device based on IGBT module

Abstract

The invention discloses a PIN forming device based on an IGBT module, and particularly relates to the technical field of PIN production. By arranging a cutting-off unit and a bending unit, after a copper wire reaches a designated position, a group of second sliding blocks arranged diagonally slide in corresponding second fixing bases, corresponding blades extrude the copper wire, and the copper wire is cut off through the bending unit; the other group of two sliders II which are arranged diagonally slide in the fixed base II and repeatedly act to form the guide angles of the PINs in four directions, so that the copper wires can be conveniently cut off, the bending unit starts to work at the same time, namely, the module I and the module II are folded to be close to the front ends of the copper wires, and the PINs can be conveniently formed. Due to the fact that the first module and the second module are arranged in a staggered mode, the front end of the copper wire is bent to form an S-shaped bend, the bending position is elastic, the copper substrate cannot be damaged, and when the copper substrate is welded, the copper substrate is effectively protected, and tension cracks are prevented.

Description

Technical Field

[0001] The invention relates to the technical field of PIN needle production, in particular to a PIN needle forming device based on an IGBT module. Background Art

[0002] IGBT module, or insulated gate bipolar transistor module, is a semiconductor device that integrates multiple IGBT chips and their drive circuits and protection circuits. IGBT module consists of a single or multiple IGBT units. Each IGBT unit is actually a composite power semiconductor device. The PIN pins of the IGBT module, also called plug pins or pins, mainly play the role of electrical connection. They connect the internal circuit of the IGBT module with the external circuit, so that the IGBT module can work normally. The quality and reliability of the PIN pins directly affect the performance and service life of the IGBT module.

[0003] The existing PIN pins are tin-plated or gold-plated as a whole. This process requires the use of tin to solder the PIN pin part in advance when soldering to the substrate. However, the PIN pin is not elastic when connected to the substrate, and there is a possibility of damaging the substrate. In addition, the solder paste contains flux, which causes the tin to climb upward, requiring multiple high-temperature soldering. After tin soldering, there are cases of cold soldering and false soldering, which causes product failure. Summary of the invention

[0004] The object of the present invention is to provide a PIN needle forming device based on an IGBT module to solve the problems mentioned in the above background technology.

[0005] The technical problems mainly solved by the present invention are:

[0006] In the existing solution, the PIN needle has no elasticity when connected to the substrate, and there is a possibility of damaging the substrate.

[0007] The present invention can be implemented by the following technical solutions:

[0008] A PIN needle forming device based on an IGBT module, comprising a vertical plate installed vertically on the edge of the top surface of a workbench, a wire hole is provided in the middle of the surface of the vertical plate, and a processing seat for positioning and processing the PIN needle is installed on the front end surface of the vertical plate, a through hole with the same center as the wire hole is provided on the end surface of the processing seat, and openings are provided on the four outer sides of the processing seat, and a cutting and bending assembly is installed on the front end surface of the vertical plate located outside the wire hole, the cutting and bending assembly comprises a cutting unit and a bending unit, the bending unit is located outside the cutting unit, and the bending unit comprises a module 1 and a module 2, the module 1 and the module 2 are staggered and respectively arranged on both sides of the processing seat; the cutting unit comprises four tool holders, the four tool holders are arranged in an X-distribution, and a blade facing the corresponding opening and guiding the PIN needle is installed inside each of the tool holders;

[0009] Four fixed bases 2 are installed on the front end surface of the vertical plate, and a slider 2 is slidably installed inside each of the fixed bases 2. One end of the slider 2 is fixed to the blade, and a bearing 3 is installed on the surface of the other end of the slider 2. A spring 2 is sleeved on the end of the blade away from the opening, and the end of the spring 2 is fixed to the outer wall of the tool holder.

[0010] A further technical improvement of the present invention is that a No. 2 cam which is in rolling contact with bearing three is rotatably mounted on the front end surface of the vertical plate, and four No. 2 cams are arranged in an X-shape, and two No. 2 cams arranged diagonally form a group, and the high point protrusions in a group of No. 2 cams are in rolling contact with bearing three at the same time.

[0011] A further technical improvement of the present invention is that: the front end surface of the vertical plate is located on both sides of the processing seat and cam No. 3 is rotatably installed, a fixed base No. 3 is installed between the cam No. 3 and the processing seat, a reset slide rod is slidably installed inside the fixed base No. 3, and one end of the reset slide rod is provided with a bearing No. 4 that is in rolling contact with the cam No. 3.

[0012] A further technical improvement of the present invention lies in that: a cam No. 1 is installed on the front end surface of the vertical plate, which is located in the middle above the two groups of cams No. 2, and a fixed base No. 1 is provided below the cam No. 1, and an automatically reset slider No. 1 is slidably installed inside the fixed base No. 1, and a connecting frame is installed on the bottom outer surface of the slider No. 1, and a push block for pushing down the folded and bent PIN needle is installed below the connecting frame.

[0013] The further technical improvement of the present invention lies in that: a mounting seat is installed at the bottom of the front end surface of the vertical plate, and a No. 4 cam is installed at the front end of the mounting seat through a transmission shaft, a fixed platform is installed on the upper surface of the end of the mounting seat, a limit plate is slidably provided on the end surface of the fixed platform, a bearing 1 that is in rolling contact with the No. 4 cam is provided below the limit plate, and an inclined block is provided above the limit plate, a sliding seat is slidably installed on the upper end surface of the fixed platform, and a sealing plate is installed on the upper end surface of the fixed platform, a bearing 2 that is in abutment contact with the inclined block is installed on one side of the sliding seat, and a collision block that squeezes the front end of the PIN needle is installed on the other side of the sliding seat, and a spring 1 is installed between the sliding seat and the sealing plate.

[0014] A further technical improvement of the present invention is that a large gear is embedded in the middle of the rear end surface of the vertical plate, and the rear end surface of the vertical plate is located outside the large gear and is rotatably provided with a plurality of transmission gears, the transmission gears are fixed to the corresponding cam No. 1, cam No. 2 and cam No. 3, and a driving gear driven by a driving motor is installed at the bottom of the large gear, the driving gear is meshed with the large gear, and the center of the driving gear is fixed to the transmission shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. By setting a cutting unit and a bending unit, after the copper wire reaches the designated position, a group of two diagonally arranged sliders 2 slide in the corresponding fixed base 2, and squeeze the spring 2 during the sliding process, and the slider 2 pushes the blade toward the opening direction, so that the blade leaves the inside of the knife holder, and the corresponding blade squeezes the copper wire, thereby forming a guide angle of the PIN needle, and breaking it at the end of the guide angle to facilitate the formation of the PIN needle. Another group of two diagonally arranged sliders 2 slide in the fixed base 2, and the action is repeated to form guide angles in four directions of the PIN needle, which is convenient for cutting the copper wire. The bending unit starts working at the same time, that is, module 1 and module 2 are closed close to the front end of the copper wire. Since module 1 and module 2 are staggered, the front end of the copper wire is bent to form an S-bend shape. Since the bending part is elastic, the copper substrate will not be damaged. When welding with the copper substrate, the copper substrate is effectively protected to prevent cracking;

[0017] 2. After the PIN needle is cut and bent, the No. 4 cam starts to work, that is, the high point protrusion in the No. 4 cam pushes the bearing 1, and then pushes the limit plate and the inclined block to move upward. The bevel of the inclined block rolls with the bearing 2, and then pushes the sliding seat to slide on the upper end surface of the fixed table. At this time, the collision block squeezes the front end of the PIN needle, thereby forming a flat end, which is convenient for soldering balls. The chip and the PIN needle are welded at the same time to avoid falling off. Through the rotation of the No. 1 cam, the roller on the upper part of the slider is pushed, so that the slider moves down and drives the push block to move together, thereby pushing the bent and cut PIN needle away from the processing position. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the external structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 A partial enlarged view of the middle A;

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the bending and cutting assembly of the present invention;

[0022] Figure 4 For the present invention Figure 3 A partial enlarged view of point B in the middle;

[0023] Figure 5 It is a schematic diagram of the three-dimensional installation structure of the driving gear and the large gear of the present invention;

[0024] Figure 6 This is a product schematic diagram of the PIN needle of the present invention.

[0025] In the figure: 1. workbench; 2. vertical plate; 3. cam No. 1; 4. cam No. 2; 5. cam No. 3; 6. fixed base No. 1; 7. slider No. 1; 8. mounting seat; 9. cam No. 4; 10. fixed table; 11. limit plate; 12. bearing No. 1; 13. inclined block; 14. bearing No. 2; 15. sliding seat; 16. spring No. 1; 17. impact block; 18. connecting frame; 19. push block; 20. fixed base No. 2; 21. slider No. 2; 22. bearing No. 3; 23. spring No. 2; 24. tool holder; 25. fixed base No. 3; 26. bearing No. 4; 27. module No. 1; 28. module No. 2; 29. ​​processing seat; 30. through hole; 31. opening; 32. blade; 33. large gear; 34. driving gear. DETAILED DESCRIPTION

[0026] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0027] See also Figure 1-Figure 6As shown, the present invention provides a PIN needle forming device based on an IGBT module, comprising a workbench 1, a vertical plate 2 is vertically installed on the top edge of the workbench 1, a wire hole is provided in the middle of the surface of the vertical plate 2, and a processing seat 29 for positioning and processing the PIN needle is installed on the front end surface of the vertical plate 2, a through hole 30 with the same center as the wire hole is provided on the end surface of the processing seat 29, and openings 31 are provided on the four outer side surfaces of the processing seat 29, and a cutting and bending assembly is installed on the front end surface of the vertical plate 2 located outside the wire hole, the cutting and bending assembly includes a cutting unit and a bending unit, the bending unit is located outside the cutting unit, the bending unit includes a module 1 27 and a module 2 28, the module 1 27 and the module 2 28 are staggered and respectively arranged on both sides of the processing seat 29; the cutting unit includes four tool holders 24, the four tool holders 24 are arranged in an X-distribution, and a blade 32 facing the corresponding opening 31 and guiding the PIN needle is installed inside the interior of each tool holder 24; four fixed bases 20 are installed on the front end surface of the vertical plate 2, and each fixed base 20 has a A slider 21 is installed for internal sliding, one end of the slider 21 is fixed to the blade 32, and a bearing 32 is installed on the surface of the other end of the slider 21. A spring 23 is sleeved on the end of the blade 32 away from the opening 31, and the end of the spring 23 is fixed to the outer wall of the tool holder 24. During operation, the copper wire is pulled by the guide straightening of the feeder to straighten the wire. At the same time, the feeder sets a length range, and the copper wire enters through the wire hole and is transported to the front end through the through hole 30. Then, a group of two diagonally arranged sliders 21 slide in the corresponding fixed base 20 at the same time, squeezing the spring 23 during the sliding process, and the slider 21 pushes the blade 32 toward the direction of the opening 31, so that the blade 32 leaves the inside of the tool holder 24, and the corresponding blade 32 squeezes the copper wire, thereby forming a guide angle of the PIN needle, which is broken at the end of the guide angle to facilitate the formation of the PIN needle. Then, another group of two diagonally arranged sliders 21 slide in the fixed base 20, and the action is repeated to form guide angles in four directions of the PIN needle, which is convenient for cutting the copper wire. Figure 6 At the end shown, when the guide angle of the PIN needle end is squeezed, the bending unit starts working at the same time, that is, module 1 27 and module 2 28 are closed close to the front end of the copper wire. Since module 1 27 and module 2 28 are staggered, the front end of the copper wire is bent to form an S-bend shape. Since the bending part is elastic, the copper substrate will not be damaged. When welding with the copper substrate, the copper substrate is effectively protected to prevent cracking.

[0028] See also Figure 3 and Figure 4As shown, the front end surface of the vertical plate 2 is rotatably mounted with a No. 2 cam 4 that is in rolling contact with the bearing three 22. There are four No. 2 cams 4, and the four No. 2 cams 4 are distributed in an X shape. The two No. 2 cams 4 arranged diagonally form a group. The high point protrusions in one group of No. 2 cams 4 are in rolling contact with the bearing three 22 at the same time, and the high point protrusions in the other group of No. 2 cams 4 are in rolling contact with the corresponding bearing three 22. First, the high point protrusions in one group of No. 2 cams 4 are in rolling contact with the bearing three 22, pushing the diagonally arranged slider two 21 to slide in the corresponding fixed base two 20. The slider two 21 elastically pushes the blade 32 in the tool holder 24 to move, and the blade 32 squeezes the end of the copper wire. When the high point protrusion in the No. 2 cam 4 is no longer in contact with the bearing three 22, the bearing three 22 is reset to the initial position under the elastic reset of the spring two 23, and then the other group of diagonally arranged sliders two 21 repeat the action of the first group, thereby forming PI The guide angles of the N needle in four directions; the front end surface of the vertical plate 2 is located on both sides of the processing seat 29, and the No. 3 cam 5 is rotatably installed. A fixed base 3 25 is installed between the No. 3 cam 5 and the processing seat 29, and a reset slide bar is slidably installed inside the fixed base 3 25. One end of the reset slide bar is provided with a bearing 4 26 that is in rolling contact with the No. 3 cam 5. Module 1 27 and module 2 28 are respectively fixed to the corresponding reset slide bars. When the copper wire is cut, the copper wire is bent at the same time, that is, through the rotation of the No. 3 cam 5, its high point protrusion contacts with the bearing 4 26, and the bearings 4 26 on both sides push the reset slide bar to slide in the fixed base 3 25, and the reset slide bar pushes the module 1 27 and the module 2 28 to approach the center, completing the bending operation on the front part of the PI N needle.

[0029] See also Figure 1 and Figure 2 As shown, the front end surface of the vertical plate 2 is located in the middle above the two groups of No. 2 cams 4, and a No. 1 cam 3 is installed. A fixed base 6 is arranged below the No. 1 cam 3. An automatically reset slider 7 is slidably installed inside the fixed base 6. A connecting frame 18 is installed on the bottom outer surface of the slider 7. A push block 19 for pushing down the bent PI N needle is installed below the connecting frame 18. When the guide angles of the PI N needle in four directions are completed, the No. 1 cam 3 is rotated and the roller on the upper part of the slider 7 is pushed, so that the slider 7 slides elastically in the fixed base 6. The slider 7 moves downward and drives the connecting frame 18 and the push block 19 to move together, so as to push the bent and cut PI N needle away from the processing position. When the high point protrusion in the No. 1 cam 3 does not contact the roller, the slider 7 is reset to the initial position to continue the molding production of the next cycle of the PI N needle. The material guide trough is installed in the unloading position in advance to guide the PI N needle to fall to the fixed position.

[0030] See also Figure 1 and Figure 2As shown, a mounting seat 8 is installed at the bottom of the front end surface of the vertical plate 2, and a No. 4 cam 9 is installed at the front end of the mounting seat 8 through a transmission shaft rod, a fixed platform 10 is installed on the upper surface of the end of the mounting seat 8, and a limit plate 11 is slidably provided at the end surface of the fixed platform 10, a bearing 12 that is in rolling contact with the No. 4 cam 9 is provided below the limit plate 11, and an inclined block 13 is provided above the limit plate 11, a sliding seat 15 is slidably installed on the upper end surface of the fixed platform 10, and a sealing plate is installed on the upper end surface of the fixed platform 10, a bearing 2 14 that is in abutment contact with the inclined block 13 is installed on one side of the sliding seat 15, and the other side of the sliding seat 15 is provided with a bearing 14 that is in abutment contact with the inclined block 13. A collision block 17 for squeezing the front end of the PIN needle is installed on one side, and a spring 16 is installed between the sliding seat 15 and the sealing plate. When the PIN needle is cut and bent, the No. 4 cam 9 starts to work, that is, the high point protrusion in the No. 4 cam 9 pushes the bearing 12, and then pushes the limit plate 11 and the inclined block 13 to move upward, and the hypotenuse of the inclined block 13 rolls in contact with the bearing 2 14, thereby pushing the sliding seat 15 to slide on the upper end surface of the fixed platform 10. At this time, the collision block 17 squeezes the front end of the PIN needle to form a flat end, which is convenient for soldering balls and can weld chips and PIN needles at the same time to avoid falling off.

[0031] like Figure 6 The product shown in the figure is a PIN needle product, with a chamfer at the end, the front end is extruded flat, and the front part is folded into an S-bend. After the product is produced, the flat position makes it convenient for the laser spot welding machine to implant solder balls into the flat end face of the PIN needle.

[0032] like Figure 1 and Figure 5 As shown, a large gear 33 is embedded in the middle of the rear end surface of the vertical plate 2, and the rear end surface of the vertical plate 2 is located outside the large gear 33 and is rotatably provided with a plurality of transmission gears, which are fixed to the corresponding cam No. 1 3, cam No. 2 4 and cam No. 3 5. A driving gear 34 driven by a driving motor is installed at the bottom of the large gear 33, and the driving gear 34 is meshed with the large gear 33. The center of the driving gear 34 is fixed to the transmission shaft, and the large gear 33 is driven to rotate by the driving gear 34, which in turn drives a plurality of transmission gears to move, thereby making the cam No. 1 3, cam No. 2 4 and cam No. 3 5 work together to ensure the normal movement of the entire device.

[0033] When the present invention is in use, by setting a cutting unit and a bending unit, after the copper wire reaches the specified position, a group of two diagonally arranged sliders 21 slide in the corresponding fixed base 20, and the spring 23 is squeezed during the sliding process, and the slider 21 pushes the blade 32 toward the direction of the opening 31, so that the blade 32 leaves the inside of the knife holder 24, and the corresponding blade 32 squeezes the copper wire, thereby forming a guide angle of the PIN needle, and breaking at the end of the guide angle to facilitate the formation of the PIN needle, and another group of two diagonally arranged sliders 21 slide in the fixed base 20, repeating the action to form guide angles in four directions of the PIN needle, which is convenient for cutting the copper wire, and the bending unit starts working at the same time, that is, the module 1 27 and the module 2 28 are closed and close to the front end of the copper wire. Since the module 1 27 and the module 2 28 are staggered, the front end of the copper wire is bent to form an S-bend shape. Since the bending part is elastic, the copper substrate will not be damaged. When welding with the copper substrate, the copper substrate is effectively protected to prevent cracking;

[0034] After the PIN needle is cut and bent, the No. 4 cam 9 starts to work, that is, the high point protrusion in the No. 4 cam 9 pushes the bearing 12, and then pushes the limit plate 11 and the inclined block 13 to move upward, and the hypotenuse of the inclined block 13 rolls with the bearing 2 14, thereby pushing the sliding seat 15 to slide on the upper end surface of the fixed platform 10. At this time, the collision block 17 squeezes the front end of the PIN needle to form a flat end, which is convenient for soldering balls and welding chips and PIN needles at the same time to avoid falling off. Through the rotation of the No. 1 cam 3, the roller on the upper part of the slider 7 is pushed, so that the slider 7 moves downward and drives the push block 19 to move together, thereby pushing the bent and cut PIN needle away from the processing position.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A PIN needle forming device based on an IGBT module, comprising a vertical plate (2) vertically mounted on the edge of the top surface of a workbench (1), characterized in that: A wire hole is provided in the middle of the surface of the vertical plate (2), and a processing seat (29) for positioning the PIN needle is installed on the front end surface of the vertical plate (2), a through hole (30) co-centered with the wire hole is provided on the end surface of the processing seat (29), and openings (31) are provided on the four outer side surfaces of the processing seat (29), and a cutting and bending assembly is installed on the front end surface of the vertical plate (2) outside the wire hole, and the cutting and bending assembly includes a cutting unit and a bending unit, the bending unit is located outside the cutting unit, and the bending unit is provided on the outer side of the cutting unit. The unit comprises a module 1 (27) and a module 2 (28), wherein the module 1 (27) and the module 2 (28) are staggered and respectively arranged on both sides of a processing seat (29), and the module 1 (27) and the module 2 (28) are closed close to the front end of the copper wire, and the front end of the copper wire is bent to form an S-bend shape; the cutting unit comprises four tool holders (24), and the four tool holders (24) are arranged in an X-distribution, and a blade (32) facing the inside of a corresponding opening (31) and guiding the PIN needle is installed inside each of the tool holders (24); Four fixed bases (20) are installed on the front end surface of the vertical plate (2), and a slider (21) is slidably installed inside each of the fixed bases (20). One end of the slider (21) is fixed to the blade (32), and a bearing (22) is installed on the surface of the other end of the slider (21). A spring (23) is sleeved on the end of the blade (32) away from the opening (31), and the end of the spring (23) is fixed to the outer wall of the tool holder (24).

2. A PIN needle forming device based on an IGBT module according to claim 1, characterized in that: A second cam (4) rolling in contact with a third bearing (22) is rotatably mounted on the front end surface of the vertical plate (2), and four second cams (4) are provided, and the four second cams (4) are arranged in an X-shape, and two second cams (4) arranged diagonally form a group, and the high point protrusions in a group of second cams (4) are in rolling contact with the third bearing (22) at the same time.

3. The PIN needle forming device based on the IGBT module according to claim 1, characterized in that: The front end surface of the vertical plate (2) is located on both sides of the processing seat (29) and is rotatably mounted with a third cam (5). A fixed base (25) is installed between the third cam (5) and the processing seat (29). A reset slide bar is slidably installed inside the fixed base (25). One end of the reset slide bar is provided with a bearing four (26) that is in rolling contact with the third cam (5). Module one (27) and module two (28) are respectively fixed to the corresponding reset slide bars.

4. A PIN needle forming device based on an IGBT module according to claim 2, characterized in that: A cam No. 1 (3) is installed on the front end surface of the vertical plate (2) located in the middle above the two groups of cam No. 2 (4), and a fixed base No. 1 (6) is arranged below the cam No. 1 (3). An automatically reset slider No. 1 (7) is slidably installed inside the fixed base No. 1 (6), and a connecting frame (18) is installed on the bottom outer surface of the slider No. 1 (7), and a push block (19) for pushing down the folded and bent PIN needle is installed below the connecting frame (18).

5. The PIN needle forming device based on the IGBT module according to claim 1, characterized in that: A mounting seat (8) is installed at the bottom of the front end surface of the vertical plate (2), and a fourth cam (9) is installed at the front end of the mounting seat (8) through a transmission shaft rod. A fixed platform (10) is installed on the upper surface of the end of the mounting seat (8). A limit plate (11) is slidably provided at the end surface of the fixed platform (10). A bearing (12) that is in rolling contact with the fourth cam (9) is provided below the limit plate (11), and an inclined block (13) is provided above the limit plate (11). A sliding seat (15) is slidably installed on the upper end surface of the fixed platform (10), and a sealing plate is installed on the upper end surface of the fixed platform (10). A bearing (14) that is in abutment contact with the inclined block (13) is installed on one side of the sliding seat (15), and a collision block (17) that presses the front end of the PIN needle is installed on the other side of the sliding seat (15). A spring (16) is installed between the sliding seat (15) and the sealing plate.

6. The PIN needle forming device based on the IGBT module according to claim 5, characterized in that: A large gear (33) is embedded in the middle of the rear end surface of the vertical plate (2), and a plurality of transmission gears are rotatably arranged outside the large gear (33) on the rear end surface of the vertical plate (2), and the transmission gears are fixed to the corresponding first cam (3), second cam (4) and third cam (5). A driving gear (34) driven by a driving motor is installed at the bottom of the large gear (33), and the driving gear (34) is meshed with the large gear (33), and the center of the driving gear (34) is fixed to the transmission shaft.

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