A fixing device for bulk lead wire welding

Abstract

The application discloses a fixing device for bulk lead wire welding and belongs to the technical field of semiconductor manufacturing. The fixing device comprises a mounting seat, a lead wire length limiting plate with a positioning block, a lead wire jack positioning plate and a substrate fixing plate which are sequentially connected through a screw rod, a guide groove and a positioning groove in the mounting seat, and the plates are fixedly connected through the interaction of a leveling nut, an equal-height sleeve and first and second locking nuts connected on the screw rod. The sliding guide cooperation of the positioning block and the guide groove ensures the mutual parallelism between the plate surfaces, the lead wire length limiting plate, the lead wire jack positioning plate, the substrate fixing plate and the substrate can be fixedly limited, the parallelism between the plate surfaces is not easily changed, the perpendicularity requirement and the equal-degree extension requirement of the lead wire are further ensured, all the lead wires are inserted into the lead wire welding through holes on the substrate through the device, the lead wires are limited on the side and the bottom, the device can be applied to an automatic welding machine, and thus the welding efficiency and the welding quality are improved.

Description

Technical Field

[0001] This invention relates to the field of semiconductor manufacturing technology, and more specifically to a fixing device for bonding bulk leads. Background Technology

[0002] Hybrid integrated circuit architecture design involves various types of bulk lead soldering. The main structures involved are: firstly, lead interconnection soldering between multilayer boards; and secondly, lead interconnection soldering first used for internal circuit lead soldering, and then assembling the leads to components or complete devices.

[0003] Bulk lead types mainly include cylindrical metal leads, cross-shaped metal leads, and nail-head metal leads. Because bulk leads are individual, scattered leads, current lead soldering technology uses manual soldering irons to solder each lead individually. However, this technology has the following problems:

[0004] 1) Low soldering efficiency: Since each lead is individual and no limiting and fixing method is adopted, each lead can only be soldered to the substrate one by one by manual soldering with a soldering iron.

[0005] 2) Poor welding quality: First, the quality of the solder joints is inconsistent due to differences in the skill level of the personnel; second, the lead wires extend in different lengths and need to be trimmed; third, the verticality of the lead wires cannot be guaranteed after welding, requiring subsequent pin reshaping.

[0006] Overall, the existing technology for soldering bulk leads has low efficiency and poor soldering quality. Summary of the Invention

[0007] To address the aforementioned technical problems, the present invention provides a fixing device for welding bulk lead wires.

[0008] The present invention adopts the following technical solution:

[0009] A fixing device for welding bulk lead wires includes a mounting base, characterized in that: the mounting base includes a base plate and two side plates perpendicularly connected thereto, the two side plates are arranged opposite to each other, the base plate is provided with a set of vertical screws, each side plate is provided with a guide groove with an open top and arranged vertically, one of the guide grooves on each side plate is provided with a connected positioning groove at the top, the groove width of the positioning groove is greater than the groove width of the guide groove, and the bottom of the positioning groove is parallel to the base plate;

[0010] Inside the mounting base, from bottom to top, there are a lead wire length limiting plate, a lead wire insertion hole positioning plate, and a base plate fixing plate, which are fitted onto the screw with a gap. The lead wire length limiting plate and the lead wire insertion hole positioning plate are both fitted with the guide grooves on both sides to form a guide sliding connection. The base plate fixing plate is fitted with the positioning groove and supported on the bottom of the positioning groove.

[0011] The lower end of the lead wire length limiting plate is provided with a leveling nut connected to the screw; a height equalizing sleeve is provided between the lead wire insertion hole positioning plate and the lead wire length limiting plate, and the height equalizing sleeve is fitted onto the screw; the upper end of the lead wire insertion hole positioning plate is provided with a first locking nut connected to the screw, which is used to fix the position of the lead wire insertion hole positioning plate and the lead wire length limiting plate as a whole; the upper end of the substrate fixing plate is provided with a second locking nut connected to the screw, which is used to fix the position of the substrate fixing plate.

[0012] The lead insertion hole positioning plate is evenly distributed with a set of limiting through holes; the substrate fixing plate is provided with a set of positioning posts, which position and connect the substrate to the plane of the substrate fixing plate. The substrate fixing plate is also provided with windows for avoiding devices and leads to be mated on the substrate.

[0013] Furthermore, both sides of the lead wire length limiting plate, lead wire insertion hole positioning plate, and substrate fixing plate are equipped with positioning blocks that cooperate with guide grooves and / or positioning grooves.

[0014] Furthermore, the equal-limiting through hole includes an inverted conical hole with a larger upper end and a smaller lower end, and a cylindrical hole directly connected to it. The small end of the inverted conical hole is directly connected to the cylindrical hole with the same diameter, and the cylindrical hole is clearance-fitted with the lead wire to be mated.

[0015] Furthermore, one of the guide grooves has a wider groove than the others, for use in assembling error-proofing features.

[0016] Furthermore, the equal-height sleeve is threadedly connected to the corresponding screw.

[0017] Furthermore, a vertical scale is provided on the outer surface of the side plate.

[0018] Furthermore, the value of the scale increases from top to bottom, and its zero position is flush with the upper surface of the substrate fixing plate 40.

[0019] Compared with existing technologies, the present invention has the following advantages:

[0020] In this design, the sliding guide cooperation between the positioning block and the guide groove ensures that the surfaces of each plate are parallel to each other. The interaction of the leveling nut, the equalizing sleeve, and the first and second locking nuts connected to the screw can limit and fix the lead wire length limiting plate, the lead wire insertion hole positioning plate, the base plate fixing plate, and the base plate, so as to ensure that the parallel relationship between the surfaces of each plate is not easily changed, and further ensure the perpendicularity and extension equalness requirements of the lead wire. By inserting the lead wire into all the lead wire welding through holes on the base plate through this device, the lead wire is limited by the periphery and bottom side, which can be used for automatic welding machines, thereby improving both welding efficiency and welding quality. Attached Figure Description

[0021] Figure 1 This is an exploded view of the structure according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the limiting through hole structure according to an embodiment of the present invention;

[0023] Figure 3 This is an assembly diagram of an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached drawings: 1. Screw; 2. Leveling nut; 3. Equalizing sleeve; 4. First locking nut; 5. Second locking nut; 6. Base plate; 61. Positioning hole; 7. Scale; 10. Mounting base; 11. Base plate; 12. Side plate; 13. Guide groove; 14. Positioning groove; 20. Lead wire length limiting plate; 21. Positioning block; 30. Lead wire insertion hole positioning plate; 31. Limiting through hole; 311. Inverted conical hole; 312. Cylindrical hole; 40. Base plate fixing plate; 41. Positioning post; 42. Window hole. Detailed Implementation

[0025] To make the present invention clearer, a fixing device for welding bulk lead wires according to the present invention will be further described below with reference to the accompanying drawings. The specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0026] like Figures 1 to 3 As shown, a fixing device for welding bulk lead wires includes a mounting base 10, which consists of a base plate 11 and two side plates 12 perpendicularly connected to it. The two side plates 12 are parallel to each other and spaced apart. The mounting base 10 has a U-shaped cross-section and is preferably integrally formed by bending a metal plate. Four vertically fixed screws 1 are provided on the base plate 11, and the screws 1 have continuous threads. Two guide grooves 13 are provided on each side plate 12. Each guide groove 13 is vertically arranged, with an open upper end and the bottom of the groove flush with the upper surface of the base plate 11. The two side walls of the guide groove 13 are parallel to each other, and the groove width has a precision requirement. A connecting positioning groove 14 is provided at the upper end of the guide groove 13 near the left side of each side plate 12. The width of the positioning groove 14 is greater than the width of the guide groove 13, and the bottom of the positioning groove 14 is parallel to the base plate 11.

[0027] Inside the mounting base 10, from bottom to top, there are a lead wire length limiting plate 20, a lead wire insertion hole positioning plate 30, and a substrate fixing plate 40. The lead wire length limiting plate 20, the lead wire insertion hole positioning plate 30, and the substrate fixing plate 40 are all rectangular plates. Their surfaces have through holes (not shown in the figure) corresponding to the screw 1, through which they are fitted onto the screw 1. Two protruding positioning blocks 21 are integrally provided on each of their two sides. The positioning blocks 21 have dimensional accuracy requirements. The positioning blocks of the lead wire length limiting plate 20 and the lead wire insertion hole positioning plate 30 are matched with the guide groove 13 to form a clearance fit, which plays a sliding guiding role. The positioning block of the substrate fixing plate 40 near the left side can be supported on the bottom of the positioning groove 14, and the positioning block near the right side can be matched with the guide groove 13 to form a clearance sliding fit.

[0028] The lower end of the lead wire length limiting plate 20 is provided with a set of leveling nuts 2, which are screwed onto each screw rod 1. Rotating the leveling nuts 2 ensures that their upper surfaces are all on the same horizontal plane. A height equalizing sleeve 3 is provided between the lead wire insertion hole positioning plate 30 and the lead wire length limiting plate 20. The height equalizing sleeve 3 has a through hole and is fitted onto each screw rod 1 to ensure a fixed distance between the lead wire insertion hole positioning plate 30 and the lead wire length limiting plate 20. The upper end of the lead wire insertion hole positioning plate 30 is provided with a first locking nut 4 connected to each screw rod 1, which can tighten the lead wire insertion hole positioning plate 30 and the lead wire length limiting plate 20 together, thus fixing their positions as a whole. The upper end of the substrate fixing plate 40 is provided with a second locking nut 5 connected to each screw rod 1. Tightening the second locking nut 5 presses the substrate fixing plate 40 firmly onto the bottom of the positioning groove 14. Among them, the leveling nut 2 and the first locking nut 4 are both hexagonal long nuts, which are convenient to use tools to turn the knob; the second locking nut 5 is a thin hexagonal nut.

[0029] In another embodiment, the equalizing sleeve 3 has a threaded through hole, specifically a hexagonal long nut, which is threaded onto the screw 1. By rotating the equalizing sleeve 3, fine adjustments are made to change the distance between the lead-in socket positioning plate 30 and the lead length limiting plate 20. This, combined with the first locking nut 4, fixes the lead-in socket positioning plate 30 in place. Since the lead length limiting plate 20 is supported on the leveling nut 2, and this device is applied to the limiting of lightweight leads, with the leads resting on the surface of the lead length limiting plate 20, the distance between the lead-in socket positioning plate 30 and the lead length limiting plate 20 does not easily change, thus meeting the usage requirements.

[0030] A set of limiting through holes 31 are evenly arranged on the lead insertion hole positioning plate 30, and the axis of the limiting through holes 31 is perpendicular to the plate surface of the lead insertion hole positioning plate 30. Each limiting through hole 31 includes an inverted conical hole 311 with a larger upper end and a smaller lower end, and a cylindrical hole 312 directly connected to it. The small end of the inverted conical hole 311 is directly connected to the cylindrical hole 312 with the same diameter, and the cylindrical hole 312 is clearance-fitted with the lead to be mated. The positioning position of the limiting through holes 31 corresponds to the position of the lead to be mated in the substrate 6, so as to ensure that when the substrate 6 is installed on this device, there is a limiting through hole 31 that is vertically corresponding to the lead. The inverted conical hole 311 is set to facilitate the insertion of the lead and serves as a guide.

[0031] The substrate fixing plate 40 is provided with a set of positioning posts 41, which are vertically fixed to the connected plate surface. The positions of the positioning posts 41 correspond to the positioning holes 61 of the substrate 6. The substrate 6 is positioned and connected to the upper plane of the substrate fixing plate 40 by the positioning posts 41. The center of the plate surface of the substrate fixing plate 40 is also provided with a window hole 42 for avoiding devices and leads to be mated on the substrate.

[0032] The lead length limiting plate 20 and the substrate fixing plate 40 are machined from metal plates, and the lead insertion hole positioning plate 30 is made of a PCB board with layout design.

[0033] In this device, one of the guide grooves 13 has a wider groove than the other guide grooves, which is used to install the error prevention device.

[0034] A vertical scale 7 is provided on the outer surface of the side plate 12. The value of the scale 7 increases from top to bottom. Its zero position is flush with the upper surface of the substrate fixing plate 40, and the lead wire extension length can be determined by visual inspection.

[0035] How to use this device:

[0036] S1. Install lead wire length limiting plate:

[0037] 1) First, install a leveling nut 2 on each of the four screws 1, and rotate the leveling nut 2 to the base of the support;

[0038] 2) Next, put the lead wire length limiting plate 20 onto the screw 1 and place it on the leveling nut 2, while its four positioning blocks 21 are inserted into the guide groove 13;

[0039] 3) Adjust according to the length of the lead wire to make the upper surfaces of the four leveling nuts 2 at the same level, and adjust the lead wire length limiting plate 20 to the required height (which can be determined by observing with a ruler 7).

[0040] S2. Install the lead wire socket positioning plate:

[0041] 1) Place the equal height sleeve 3 on the screw 1 and on the upper surface of the lead wire length limiting plate 20. The height of the equal height sleeve 3 can be about half of the lead wire extension length.

[0042] 2) Next, insert the lead wire insertion hole positioning plate 30 into the screw 1 and place it on the upper surface of the equal height sleeve 3, while its four positioning blocks 21 are inserted into the guide groove 13;

[0043] 3) Install the first locking nut 4 on each screw 1 to fix both the lead wire insertion hole positioning plate 30 and the lead wire length limiting plate 20.

[0044] S3. Install the substrate fixing plate:

[0045] 1) The two positioning blocks of the substrate fixing plate 40 are inserted into the guide groove 13 and the other two positioning blocks are inserted into the positioning groove 14, and the lower surface of the substrate fixing plate 40 is in contact with the bottom of the positioning groove 14. At this time, the upper surface of the substrate fixing plate 40 is exactly flush with the "0" mark on the scale 7.

[0046] 2) Install the second locking nut 5 on each screw 1 to fix the base plate fixing plate 40.

[0047] S4. Mounting the substrate:

[0048] The substrate 6, which requires wire bonding, is positioned on the upper surface of the substrate fixing plate 40 by positioning post 41.

[0049] S5. Install lead wires:

[0050] A single lead is placed into the lead mounting through hole on the substrate and passes through the limiting through hole 31 of the lead insertion positioning plate 30 of the second layer, ending at the lead length limiting plate 20 of the third layer. At this time, the lead length and perpendicularity are precisely controlled. In this way, the lead mounting in all the through holes of the substrate that need to be soldered is completed.

[0051] S6, Lead soldering:

[0052] At this time, all leads are circumferentially limited by the lead mounting through holes on the upper substrate and the limiting through holes on the lower substrate. The bottom of the lead is supported and limited by the lead length limiting plate, so that each lead is of equal length and perpendicular to the substrate, which greatly facilitates subsequent welding. For example, automatic welding machine welding, reflow soldering, or even manual welding can be used.

[0053] In this scheme, the sliding guide cooperation between the positioning block 21 and the guide groove 13 ensures that the surfaces of each plate are parallel to each other. The interaction between the leveling nut 2, the equal height sleeve 3 and the first locking nut 4 connected on the screw 1 can fix the plates to ensure that the parallel relationship between the surfaces of each plate is not easily changed, and further ensure the perpendicularity requirement and the equal extension length requirement of the lead wire. This scheme can limit the position of the lead wire, which can greatly improve the welding quality and efficiency of the subsequent bulk lead wire.

[0054] The above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. However, obvious variations or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A fixing device for welding bulk lead wires, comprising a mounting base (10), characterized in that: The mounting base (10) includes a base plate (11) and two side plates (12) perpendicularly connected thereto. The two side plates (12) are arranged opposite to each other. A set of vertical screws (1) is provided on the base plate (11). Each side plate (12) is provided with a guide groove (13) with an open top and arranged vertically. One of the guide grooves (13) on each side plate is provided with a connected positioning groove (14) at the top. The width of the positioning groove (14) is greater than the width of the guide groove (13). The bottom of the positioning groove (14) is parallel to the base plate (11). Inside the mounting base (10), from bottom to top, there are a lead wire length limiting plate (20), a lead wire insertion hole positioning plate (30), and a base plate fixing plate (40) that are fitted onto the screw (1) with a gap. The lead wire length limiting plate (20) and the lead wire insertion hole positioning plate (30) are both fitted with the guide grooves (13) on both sides with a gap to form a guide sliding connection. The base plate fixing plate (40) is fitted with the positioning groove (14) and is supported on the bottom of the positioning groove (14). The lower end of the lead wire length limiting plate (20) is provided with a leveling nut (2) connected to the screw (1); a height equalizing sleeve (3) is provided between the lead wire insertion hole positioning plate (30) and the lead wire length limiting plate (20), and the height equalizing sleeve (3) is fitted on the screw (1); the upper end of the lead wire insertion hole positioning plate (30) is provided with a first locking nut (4) connected to the screw (1), which is used to fix the position of the lead wire insertion hole positioning plate (30) and the lead wire length limiting plate (20) as a whole; the upper end of the substrate fixing plate (40) is provided with a second locking nut (5) connected to the screw (1), which is used to fix the position of the substrate fixing plate; The lead insertion positioning plate (30) is evenly distributed with a set of limiting through holes (31); the substrate fixing plate (40) is provided with a set of positioning posts (41), and the substrate (6) is positioned and connected to the upper plane of the substrate fixing plate (40) by the positioning posts (41). The substrate fixing plate (40) is also provided with window holes (42) for avoiding devices and leads to be matched on the substrate.

2. The fixing device for welding bulk lead wires according to claim 1, characterized in that: The lead wire length limiting plate (20), lead wire insertion hole positioning plate (30) and substrate fixing plate (40) are all connected to the guide groove (13) and / or positioning groove (14) by positioning blocks (21) on both sides.

3. A fixing device for welding bulk lead wires according to claim 2, characterized in that: The limiting through hole (31) includes an inverted conical hole (311) with a large upper end and a small lower end, and a cylindrical hole (312) directly connected to it. The small end of the inverted conical hole (311) is directly connected to the cylindrical hole (312) with the same diameter. The cylindrical hole (312) is in clearance fit with the lead wire to be fitted.

4. A fixing device for welding bulk lead wires according to claim 3, characterized in that: One of the guide grooves (13) has a wider groove than the other guide grooves, and is used to assemble the error prevention device.

5. A fixing device for welding bulk lead wires according to claim 1, characterized in that: The equal-height sleeve (3) is threadedly connected to the corresponding screw (1).

6. A fixing device for welding bulk lead wires according to claim 1, characterized in that: A vertical scale (7) is provided on the outer surface of the side plate (12).

7. A fixing device for welding bulk lead wires according to claim 6, characterized in that: The value of the scale (7) increases from top to bottom, and its zero position is flush with the upper surface of the base plate fixing plate (40).

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