Welding cushion block device and welding machine applying same

Abstract

The utility model provides a welding cushion block device and a welding machine using the same, and the welding cushion block device comprises a cushion block base which is used for being fixedly connected with the welding machine; the clamping structure is arranged at the top of the cushion block base; and the frame cushion block is fixedly clamped to the clamping structure, the top supporting face of the frame cushion block is higher than the clamping structure, and the frame cushion block is used for supporting the lead frame of the welding machine when the welding machine executes welding operation. According to the welding cushion block device provided by the utility model, the shape structure of the special cushion block adaptive to the TO-3P chip is changed, the cushion block main body is arranged to be the cushion block base used for being fixedly connected with an aluminum wire welding machine track, meanwhile, the clamping structure is arranged at the top of the cushion block base, and the frame cushion block is fixedly clamped on the clamping structure; and the top supporting surface of the frame cushion block is higher than the clamping structure, so that the TO-3P special cushion block is quickly transformed into a special lead frame which is adaptive to and supports a TO-247 power module, and aluminum wire welding is performed after the lead frame is pressed down to the top of the frame cushion block which is heightened relative to the cushion block base by a welding machine, so that the pseudo soldering rate is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum wire welding machines, in particular to a welding pad device and a welding machine using the same. Background Art

[0002] The aluminum wire bonding machine is used to bond the lead frame and the pad (PAD) on the chip with aluminum wire to achieve the circuit connection between the chip and the lead frame. Specifically, the aluminum wire bonding machine can perform the wire bonding process on the chip. The aluminum wire bonding machine is provided with a trough body inside, and a track is provided on the trough body. The aluminum wire bonding machine loads the die bonded lead frame onto the track and pushes the lead frame from one end of the track to the other end, and performs welding on the chip and the lead frame during the pushing process.

[0003] Since the step difference of the dedicated lead frame of the TO-247 power module (the distance between the power module welding surface of the TO-247 power module on its dedicated lead frame and the frame pin) is larger than the step difference of the dedicated lead frame of the TO-3P chip (the distance between the chip welding surface of the TO-3P chip on its dedicated lead frame and the frame pin), the height of the pad specifically used to support the TO-3P lead frame during welding is relatively low (the height of the pad supporting the TO-247 lead frame during welding). If the dedicated pad of TO-3P, which is widely used, is directly used when welding the aluminum wire to the TO-247 lead frame, it is easy to cause the welding machine to fail to accurately press the TO-247 lead frame into place, thereby resulting in a high solder joint cold soldering rate, that is, the dedicated pad of TO-3P cannot be directly used to support the TO-247 lead frame. Therefore, the art needs to improve the dedicated pad of the TO-3P chip so that it can be adapted and compatible with the TO-247 lead frame at the same time, improve the adaptability of the dedicated pad of the TO-3P chip used in large quantities and reduce the production cost. Utility Model Content

[0004] The utility model provides a welding pad device to solve the technical problems in the prior art that the dedicated pad for TO-3P chip is relatively low in height, poor in versatility, and cannot be adapted to support the lead frame of TO-247 power module during aluminum wire welding.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is:

[0006] The utility model provides a welding pad device, comprising:

[0007] The pad base is used for fixed connection with the welding machine;

[0008] A clamping structure is arranged on the top of the pad base;

[0009] The frame pad is fixedly clamped on the clamping structure, and the top supporting surface of the frame pad is higher than the clamping structure, and is used to support the lead frame of the welding machine when the welding machine performs welding operations.

[0010] Preferably, the top two ends of the frame pad respectively correspond to a pair of inclined transition surfaces, and the clamping structure includes:

[0011] The first clamping block and the second clamping block are fixedly connected to the top of the cushion block base at intervals; the side end of the first clamping block facing the second clamping block is provided with a first inclined clamping surface matching the shape of the inclined transition surface, and the side end of the second clamping block facing the first clamping block is provided with a second inclined clamping surface matching the shape of the inclined transition surface;

[0012] The frame pad is fixedly clamped on the clamping structure through a pair of inclined clamping surfaces which correspond to the first inclined clamping surface and the second inclined clamping surface respectively.

[0013] Preferably, the first clamping block is integrally connected to one side of the top of the cushion block base;

[0014] A slide groove is provided on the other side of the top of the cushion block base relative to the first clamping block, the shape of the slide groove matches the shape of the second clamping block, a first mounting hole is provided at the bottom of the slide groove, and the second clamping block is provided with a second mounting hole matching the first mounting hole;

[0015] The second clamping block cooperates with the slide groove and is detachably connected to the top of the pad base by screws or bolts passing through the corresponding second mounting holes and the first mounting holes. A clamping opening is formed between the first inclined clamping surface, the second inclined clamping surface and the top of the pad base. The frame pad is supported on the top of the pad base in the clamping opening and clamped between the first inclined clamping surface and the second inclined clamping surface.

[0016] Preferably, the pad base is provided with at least one third mounting hole for fixedly connecting with a corresponding hole position on a fixed rail provided on the base of the welding machine.

[0017] Preferably, the first clamping block, the second clamping block and the clamping opening are arranged at one end of the top of the cushion block base, the top surface height of the cushion block base opposite to the other end is lower than the height of the clamping opening, the top surface is provided with a groove, and the groove is connected to the side end surface of the cushion block base opposite to the other end;

[0018] The top surface is provided with a pair of third mounting holes on both sides of the groove respectively.

[0019] Preferably, a through groove is provided at the bottom of the cushion block base for fixedly cooperating with a fixed rail provided on the base of the welding machine.

[0020] Preferably, a mounting step is provided on the side of the cushion block base for matching with a mounting groove provided on the base of the welding machine.

[0021] Preferably, the pad base, the clamping structure and the frame pad are all made of aluminum.

[0022] The utility model also provides a welding machine, comprising a lead frame and a driving device for pulling the lead frame, and also comprising the above-mentioned welding pad device.

[0023] Preferably, the welding machine is an aluminum wire welding machine.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] The welding pad device provided by the utility model changes the shape structure of the special pad for TO-3P chip adapted to the track of the aluminum wire welding machine, sets the pad body thereof as a pad base for fixed connection with the track of the aluminum wire welding machine, and sets a clamping structure on the top of the pad base, and fixes a frame pad on the clamping structure, and the top supporting surface of the frame pad is higher than the clamping structure, so that the TO-3P special pad can be quickly and conveniently transformed into a welding pad device adapted to the special lead frame supporting the TO-247 power module when welding aluminum wires. The welding pad device can take into account the lead frames with better and worse pressing flatness, and the aluminum wire is welded after the welding machine presses the lead frame down to the top of the frame pad of the welding pad device, so as to solve the problem of high solder joint false soldering rate due to the inability of the welding machine to accurately press the TO-247 lead frame into place when the traditional TO-3P special pad directly supports the TO-247 lead frame, thereby greatly improving the welding quality of the TO-247 lead frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution proposed by the utility model, it is described in detail below in combination with the embodiments and drawings. It should be understood that the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, these drawings can be changed under the concept of the utility model.

[0027] Figure 1 The overall assembly structure of the welding pad device of the utility model is a three-dimensional Figure 1 .

[0028] Among them, the main marks of the drawings in the figure are as follows:

[0029] 1. Block base; 11. Top surface; 111. Groove; 112. Third mounting hole; 12. Slide groove; 13. Through groove; 14. Mounting step; 2. Clamping structure; 21. First clamping block; 211. First inclined clamping surface; 22. Second clamping block; 221. Second inclined clamping surface; 222. Second mounting hole; 3. Frame block; 31. Top support surface; 32. Inclined transition surface; 4. Clamping opening. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the following is a summary of the technical problems, technical solutions and beneficial effects to be solved by the present invention. Figure 1 And embodiments, the utility model is further described in detail.

[0031] See also Figure 1 A welding pad device provided in the utility model includes:

[0032] A pad base 1 is used for being fixedly connected to a welding machine; a clamping structure 2 is arranged on the top of the pad base 1; a frame pad 3 is fixedly clamped on the clamping structure 2, and a top supporting surface of the frame pad 3 is higher than the clamping structure 2, and is used for carrying and supporting the lead frame of the welding machine through the top supporting surface 31 of the frame pad 3 when the welding head of the welding machine (not shown in the figure) performs welding operations on the lead frame (not shown in the figure) and the chip (not shown in the figure) and the power module device (not shown in the figure).

[0033] In this embodiment, the top ends of the frame pad 3 correspond to a pair of inclined transition surfaces 32, and the clamping structure 2 includes:

[0034] The first clamping block 21 and the second clamping block 22 are fixedly connected to the top of the cushion block base 1 at a relative interval; the side end of the first clamping block 21 facing the second clamping block 22 is provided with a first inclined clamping surface 211 matching the shape of the inclined transition surface 32, and the side end of the second clamping block 22 facing the first clamping block 21 is provided with a second inclined clamping surface 221 matching the shape of the inclined transition surface 32;

[0035] The frame pad 3 is fixedly clamped on the clamping structure 2 through a pair of inclined clamping surfaces that respectively correspond to the first inclined clamping surface 211 and the second inclined clamping surface 221 .

[0036] In the preferred implementation of this embodiment, the frame pad 3 is rectangular (cuboid), and a pair of inclined transition surfaces 32 are respectively arranged at a pair of side edges of the upper bottom surface of the frame pad 3, and the pair of inclined transition surfaces 32 are chamfered surfaces.

[0037] In a preferred implementation manner of the present embodiment, the first clamping block 21 and the second clamping block 22 are rectangular (cuboid), one end of the first inclined clamping surface 211 is connected to the middle position in the height direction of the vertical surface of one side of the first clamping block 21 facing the second clamping block 22, and the other end of the first inclined clamping surface 211 is away from the other vertical surface relative to the first clamping block 21 (the other vertical surface facing away from the second clamping block 22) and extends obliquely upward close to the second clamping block 22, so that the first clamping block 21 extends to the top end surface of the other end of the first inclined clamping surface 211, and forms a protrusion protruding relatively close to the second clamping block 22 with the first inclined clamping surface 211.

[0038] At the same time, one end of the second inclined clamping surface 221 is connected to the middle position in the height direction of the vertical surface of the second clamping block 22 facing the first clamping block 21, and the other end of the second inclined clamping surface 221 is away from the other vertical surface of the second clamping block 22 (the other vertical surface facing away from the first clamping block 21) and extends obliquely upward close to the first clamping block 21, so that the second clamping block 22 extends to the top end surface of the other end of the second inclined clamping surface 221, and forms a protrusion protruding relative to the direction of the first clamping block 21 with the second inclined clamping surface 221.

[0039] In this embodiment, the first clamping block 21 is integrally connected (integrally formed) and arranged on one side of the top of the cushion block base 1;

[0040] A slide groove 12 is provided on the other side of the top of the cushion block base 1 relative to the first clamping block 21, and the shape of the slide groove 12 matches the shape of the second clamping block 22. A first mounting hole (not shown in the figure) is provided at the bottom of the slide groove 12, and the second clamping block 22 is provided with a second mounting hole 222 matching the first mounting hole;

[0041] The second clamping block 22 cooperates with the slide groove 12 and is detachably connected to the top of the pad base 1 by screws or bolts passing through the corresponding second mounting hole 222 and the first mounting hole. A clamping opening 4 is formed between the first inclined clamping surface 211, the second inclined clamping surface 221 and the top of the pad base 1. The frame pad 3 is supported on the top of the pad base 1 in the clamping opening 4 and clamped between the first inclined clamping surface 211 and the second inclined clamping surface 221.

[0042] In other embodiments (not shown in the figures), the first clamping block 21 may also adopt the same structural type as the second clamping block 22, that is, a slide groove is also provided on the side of the top of the cushion block base 1 opposite to the first clamping block 21, and the shape of the slide groove matches the appearance of the first clamping block 21, and a mounting hole is provided at the bottom of the slide groove (not shown in the figures), and the first clamping block 21 is provided with a mounting hole matching the first mounting hole; the first clamping block cooperates with the slide groove, and is detachably connected to the top of the cushion block base by screws or bolts passing through the corresponding mounting holes, and is symmetrically arranged with the second clamping block 22.

[0043] In this embodiment, the block base 1 is provided with at least one third mounting hole 112 for passing screws or bolts so that the bottom of the block base 1 is fixedly connected with the corresponding hole position on the fixed rail (not shown in the figure) provided on the base of the welding machine by screws or bolts, thereby fixing the block base 1 on the base of the welding machine.

[0044] In this embodiment, the first clamping block 21, the second clamping block 22 and the clamping opening 4 are arranged at the same end of the top of the cushion block base 1, the top surface 11 at the other end of the top of the cushion block base 1 is lower than the height of the clamping opening 4, the top surface 11 is provided with a groove 111, and the groove 111 is connected to the side end surface at the other end of the top of the cushion block base 1; the top surface 11 is provided with a pair of third mounting holes 112 on both sides of the groove 111. The groove 111 is used to cooperate with the corresponding protrusion structure of the above-mentioned fixed track to improve the fastening of the cushion block base 1 and the fixed track.

[0045] In a preferred implementation manner of this embodiment, the first mounting hole, the second mounting hole 222 and the third mounting hole 112 are all threaded holes.

[0046] In this embodiment, a through groove 13 is provided at the bottom of the cushion block base 1 for fixedly cooperating with a fixed rail provided on the base of the welding machine.

[0047] In a preferred implementation manner of this embodiment, the horizontal extension direction of the through slot 13 passes through directly below the clamping opening 4 , that is, the horizontal extension direction of the through slot 13 passes between the first clamping block 21 and the second clamping block 22 .

[0048] In this embodiment, the through slot 13 is in a rectangular parallelepiped shape, that is, the cross section of the through slot 13 is rectangular.

[0049] In other embodiments (not shown in the figures), the through groove 13 may also be in the shape of a polygonal column with an isosceles trapezoidal cross section.

[0050] In this embodiment, a mounting step 14 is provided on the side of the cushion block base 1 for matching with a mounting groove provided on the base of the welding machine.

[0051] In this embodiment, the pad base 1, the clamping structure 2 and the frame pad 3 are all made of aluminum.

[0052] In the preferred implementation manner of this embodiment, the cushion block base 1, the clamping structure 2 and the frame cushion block 3 are all made of 6063 aluminum profiles.

[0053] Since friction will be generated between the lead frame and the frame pad 3 when the aluminum wire welding machine pulls the lead frame, if the hardness of the material used in the frame pad 3 is too high, it is easy to cause wear of the lead frame and the frame pad 3, thereby affecting the service life of the lead frame and the frame pad 3; in addition, during welding, the welding head of the aluminum wire welding machine will generate a downward pressure on the chip or power module and the lead frame, so the frame pad 3 must not be too hard, and it must also have a certain strength and toughness to resist the pressure, so as to avoid cracking caused by excessive pressure during chip or power module welding and reduce the welding yield. 6063 aluminum profiles have the advantages of good corrosion resistance, strong oxidation resistance, moderate hardness, strength and toughness, etc., and are suitable for high friction and easy wear conditions between the frame pad 3 and the lead frame to improve the service life and welding effect of the welding pad device.

[0054] The utility model also provides a welding machine (not shown in the figure), including a lead frame (not shown in the figure) and a driving device (not shown in the figure) for pulling the lead frame, and also includes the above-mentioned welding pad device.

[0055] In this embodiment, the welding machine is an aluminum wire welding machine, and also includes an aluminum wire welding device for performing aluminum wire welding on the lead frame, the chip, and the power module device through its welding head.

[0056] In this embodiment, the driving device includes:

[0057] The guide rail is arranged above the base of the welding machine and is used for clamping and conducting the lead frame; the driving mechanism is used for driving the lead frame to move along one end of the guide rail to the other end.

[0058] The above-mentioned fixed rail on the base of the welding machine is arranged below the guide rail and parallel to the extension direction of the guide rail. The welding pad device is fixedly installed on the fixed rail so that the path of the lead frame moving along the guide rail passes directly above the frame pad 3 of the welding pad device.

[0059] In this embodiment, the lead frame may be a dedicated lead frame for a TO-247 power module, or may be a dedicated lead frame for a TO-3P chip.

[0060] In this embodiment, when the lead frame is a dedicated lead frame for the T0-247 power module and the aluminum wire welding device of the welding machine performs aluminum wire welding on the lead frame and the T0-247 power module through its welding head, two or four aluminum wires can be welded at a time according to the actual needs of the welded chip or power module device product. Each aluminum wire includes two welding points of the IGBT chip (Insulated Gate Bipolar Transistor) and the FRD chip (Fast Recovery Diode), as well as a frame welding point (named POST).

[0061] In this embodiment, when performing aluminum wire welding on the lead frame and T0-247 power module, the aluminum wire welding device of the aluminum wire welding machine is divided into two left and right welding heads, and the two welding heads respectively share half of the welding quantity, that is, 1 / 2 of the aluminum wire is welded by the left welding head, and 1 / 2 of the aluminum wire is welded by the right welding head at the same time.

[0062] Taking the welding machine as an aluminum wire welding machine as an example, the method of using the welding pad device provided by the utility model when applied to the welding machine is as follows;

[0063] S1: Support the pad base 1 on a horizontal work surface;

[0064] S2: placing the frame pad 3 on the top of the pad base 1, between the first clamping block 21 and the slide groove 12;

[0065] S3: The second clamping block 22 is matched with the slide groove 12, and screws are passed through the corresponding second mounting hole 222 and the first mounting hole to fix the second clamping block 22 to the top of the pad base 1, and a clamping opening 4 is formed between the first inclined clamping surface 211, the second inclined clamping surface 221 and the top of the pad base 1, and the frame pad 3 is supported on the top of the pad base 1 in the clamping opening 4 and clamped between the first inclined clamping surface 211 and the second inclined clamping surface 221; by adjusting the screwing depth of the screw, the frame pad 3 is clamped in the clamping opening 4, and the pad base 1, the clamping structure 2 and the frame pad 3 are fixedly connected to form an integral welding pad device;

[0066] S4: The pad base 1, the clamping structure 2 and the frame pad 3 are fixedly connected to form a welding pad device, and the pad base 1 is fixedly matched with the fixed track provided on the base of the welding machine through the through groove 13 provided at the bottom of the pad base 1, and the screws pass through the corresponding third mounting holes 112 and the corresponding holes provided on the fixed track, so that the pad base 1 is fixedly installed on the base of the welding machine;

[0067] S5: The aluminum wire welding machine loads the lead frame with completed crystal bonding onto the guide track through a robotic arm or other loading mechanism, and the driving mechanism pulls the lead frame from one end of the guide track to the other end. During the pulling process, the lead frame passes through and stays directly above the welding pad device, and the welding head of the aluminum wire welding device presses the lead frame down to fit it onto the top support surface 31 of the frame pad 3. The top support surface 31 is used to carry and support the lead frame of the welding machine, and the welding head performs aluminum wire welding on the chip or power module and the lead frame.

[0068] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding pad device, characterized in that: include: A pad base (1) for fixedly connecting to a welding machine; A clamping structure (2) is arranged on the top of the cushion block base (1); A frame pad (3) is fixedly clamped on the clamping structure (2), and the top support surface of the frame pad (3) is higher than the clamping structure (2), and is used to support the lead frame of the welding machine when the welding machine performs a welding operation.

2. The welding pad device according to claim 1, characterized in that: The top ends of the frame pad (3) respectively correspond to a pair of inclined transition surfaces (31), and the clamping structure (2) comprises: A first clamping block (21) and a second clamping block (22) are fixedly connected to the top of the cushion block base (1) at intervals; a first inclined clamping surface (211) matching the shape of the inclined transition surface (31) is provided on the side end of the first clamping block (21) facing the second clamping block (22); and a second inclined clamping surface (221) matching the shape of the inclined transition surface (31) is provided on the side end of the second clamping block (22) facing the first clamping block (21); The frame cushion block (3) is fixedly clamped on the clamping structure (2) by a pair of inclined clamping surfaces respectively corresponding to the first inclined clamping surface (211) and the second inclined clamping surface (221).

3. The welding pad device according to claim 2, characterized in that: The first clamping block (21) is integrally connected and arranged on one side of the top of the cushion block base (1); A slide groove (12) is provided on the other side of the top of the cushion block base (1) relative to the first clamping block (21), the shape of the slide groove (12) matches the shape of the second clamping block (22), a first mounting hole is provided at the bottom of the slide groove (12), and the second clamping block (22) is provided with a second mounting hole (222) matching the first mounting hole; The second clamping block (22) cooperates with the slide groove (12) and is detachably connected to the top of the cushion block base (1) by screws or bolts passing through the corresponding second mounting holes (222) and the first mounting holes; A clamping opening (4) is formed between the first inclined clamping surface (211), the second inclined clamping surface (221) and the top of the pad base (1); the frame pad (3) is supported on the top of the pad base (1) in the clamping opening (4) and clamped between the first inclined clamping surface (211) and the second inclined clamping surface (221).

4. The welding pad device according to claim 3, characterized in that: The cushion block base (1) is provided with at least one third mounting hole (112) for fixedly connecting with a corresponding hole position on a fixed track provided on the base of the welding machine.

5. The welding pad device according to claim 4, characterized in that: The first clamping block (21), the second clamping block (22) and the clamping opening (4) are arranged at one end of the top of the cushion block base (1); the height of the top surface (11) at the other end of the top of the cushion block base (1) is lower than the height of the clamping opening (4); the top surface (11) is provided with a groove (111); the groove (111) is connected to the side end surface at the other end of the top of the cushion block base (1); The top surface (11) is provided with a pair of third mounting holes (112) on both sides of the groove (111) respectively.

6. The welding pad device according to claim 4, characterized in that: A through groove (13) is provided at the bottom of the cushion block base (1) for fixedly cooperating with a fixed track provided on the base of the welding machine.

7. The welding pad device according to claim 4, characterized in that: The side of the cushion block base (1) is provided with an installation step (14) for matching with an installation groove provided on the base of the welding machine.

8. The welding pad device according to any one of claims 1 to 7, characterized in that: The pad base (1), the clamping structure (2) and the frame pad (3) are all made of aluminum.

9. A welding machine, comprising a lead frame and a driving device for pulling the lead frame, characterized in that: It also includes the welding pad device according to any one of claims 1-8.

10. The welding machine according to claim 9, characterized in that The welding machine is an aluminum wire welding machine.

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