CN114160871A

CN114160871A - Shearing auxiliary tool for surface-mounted device lead

Info

Publication number: CN114160871A
Application number: CN202111512884.5A
Authority: CN
Inventors: 张艳鹏; 王玉龙; 刘剑; 聂磊
Original assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Current assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Priority date: 2021-12-11
Filing date: 2021-12-11
Publication date: 2022-03-11
Anticipated expiration: 2041-12-11
Also published as: CN114160871B

Abstract

The invention provides a shearing auxiliary tool for a surface-mounted device lead, which comprises two guide shafts vertically fixed on the upper surface of a base, wherein a welding surface size adjusting mechanism is movably sleeved on the guide shafts; the welding surface size adjusting mechanism comprises an adjusting part, a movable clamp and a fixed clamp; the base is provided with a base outer vertical surface vertical to the feeding direction, and when the fixed clamp is sleeved on the guide shaft, the fixed clamp is provided with a fixed clamp outer vertical surface vertically aligned with the base outer vertical surface; the movable fixture is provided with a groove body to form a movable vertical panel perpendicular to the feeding direction, and one end of the lead connecting device of the surface-mounted device extends into the groove body, so that the vertical part of the lead of the surface-mounted device is attached to the movable vertical panel; the fixed fixture and the movable fixture are connected in a sliding mode along the feeding direction, and the adjusting component is used for adjusting the sliding distance between the fixed vertical panel and the outer vertical surface of the fixed fixture. The invention solves the problem that the manual trimming length of the welding surface of the flat lead surface-mounted device is uncontrollable. And the alignment precision between the formed lead and the printed board bonding pad is ensured, so that the forming parameters are quantized.

Description

Shearing auxiliary tool for surface-mounted device lead

Technical Field

The invention relates to the technical field of electronic assembly, in particular to a shearing auxiliary tool for a surface-mounted device lead.

Background

Leads of aerospace-grade high-reliability surface-mounted (surface-mounted) devices are mostly parallel to a device body and are in a horizontal state, the leads cannot be directly assembled, and the flat leads are required to be formed into a gull wing shape by using a special forming tool in combination with the size of a printed circuit board pad and the parameter requirements of forming station height, welding surface length, shoulder width and the like specified by standards. Because the die of the forming equipment is generally fixed parameters, the forming of the device lead wire can only be met under the condition of certain forming parameters, and for surface-mounted devices which can not meet the parameter requirements of the forming equipment, a manual forming mode is needed, and the forming and shearing operation of the straight lead wire is completed by means of a tool, an oblique pliers and the like. In the cutting process after the lead is formed, the integral deflection deformation of the lead caused by the action of force on the lead in the cutting direction by the cutting edge of an inclined jaw clamp or other tools for cutting often occurs, so that the lead cannot be accurately aligned with a printed board bonding pad; meanwhile, the length of the reserved welding surface of the lead cannot be confirmed in the manual shearing process, the lengths of the reserved welding surfaces of all the leads are difficult to be kept consistent, the more the number of the leads is, the more obvious the results are, the uncontrollable length of the welding surface or the inconsistent length of the welding surface generated in the shearing process possibly causes that the lapping length of the lead and the bonding pad cannot meet the relevant standard requirements, and thus the forming failure is caused.

Therefore, how to ensure that the lead of the flat lead surface-mounted device does not deflect and deform in the cutting direction and has an accurate, flush and consistent length in the process of manually cutting the bonding surface becomes a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to solve the problems and provides an auxiliary tool for shearing a lead of a surface-mounted device, and the length of a welding surface of the auxiliary tool is adjustable.

In order to achieve the purpose, the invention adopts the following specific technical scheme:

the shearing auxiliary tool for the surface-mounted device lead is characterized by comprising a base and a welding surface size adjusting mechanism;

two guide shafts are vertically fixed on the upper surface of the base, and the welding surface size adjusting mechanism is movably sleeved on the guide shafts;

the welding surface size adjusting mechanism comprises an adjusting part, a movable clamp and a fixed clamp;

the base is provided with a base outer vertical surface vertical to the feeding direction, and when the fixed clamp is sleeved on the guide shaft, the fixed clamp is provided with a fixed clamp outer vertical surface vertically aligned with the base outer vertical surface;

the movable fixture is provided with a groove body to form a movable vertical panel perpendicular to the feeding direction, and one end of the lead connecting device of the surface-mounted device extends into the groove body, so that the vertical part of the lead of the surface-mounted device is attached to the movable vertical panel;

the fixed fixture and the movable fixture are connected in a sliding mode along the feeding direction, and the adjusting component is used for adjusting the sliding distance between the fixed vertical panel and the outer vertical surface of the fixed fixture.

Further, the adjusting mechanism comprises an adjusting screw rod; the adjusting screw rod is in threaded connection with the threaded through hole of the movable clamp, and the adjusting screw rod is rotated to drive the movable clamp to move; the adjusting screw rod freely rotates in the horizontal guide hole of the fixed clamp.

Further, the adjusting screw comprises a front end thread and a round handle arranged outside the fixing clamp.

Furthermore, the welding surface size adjusting mechanism comprises a horizontal guide shaft penetrating the setting fixture and the moving fixture to realize sliding connection.

Furthermore, the fixed clamp is provided with a rectangular groove which penetrates through the upper part and the lower part, and the movable clamp is surrounded by the rectangular groove;

one end of the fixing clamp close to the groove body is provided with an opening communicated with the rectangular groove, and the opening is used for leading wires of the surface-mounted devices to extend into the groove body;

the length of the opening is smaller than that of the rectangular groove, so that the rectangular groove limits the movement distance of the brake fixture.

Furthermore, a horizontal guide shaft penetrating through the rectangular groove is fixed at one end of the fixing clamp in the length direction, and one end of the moving clamp in the length direction is in sliding connection with the horizontal guide shaft.

Furthermore, the adjusting mechanism is arranged at the other end of the movable clamp in the length direction.

Furthermore, the adjusting mechanism comprises an adjusting screw rod, the other end of the length direction of the fixed clamp is provided with the adjusting screw rod penetrating through the rectangular groove, and the other end of the length direction of the movable clamp is in threaded connection with the adjusting screw rod.

Furthermore, two vertical guide holes which penetrate through the upper part and the lower part are formed in the two ends of the clamping device, and the vertical guide holes are matched with the guide shafts for use.

The invention can obtain the following technical effects:

the invention solves the problems that the lead is deflected and deformed in the shearing direction in the process of manually shearing the welding surface of the conventional flat lead surface-mounted device, the length of the welding surface is uncontrollable, and the lengths of the leads are inconsistent. The welding surface size adjusting mechanism can be taken down from the base to independently use the length measuring tool, and the distance between the movable vertical panel and the outer vertical surface of the fixed clamp is adjusted under the action of the adjusting part. And finally, shearing the device lead by using the bevel pliers along a plane formed by the outer vertical surface of the base and the outer vertical surface of the fixed clamp.

Drawings

FIG. 1 is a schematic structural view of a shearing auxiliary tool provided by the invention;

FIG. 2 is a schematic structural diagram of a base provided by the present invention;

FIG. 3 is a schematic structural view of a holding fixture provided by the present invention;

FIG. 4 is a schematic structural view of a moving clamp according to the present invention;

FIG. 5 is a schematic view of the adjusting screw of the present invention;

fig. 6 is a schematic cross-sectional view of the shear assist tool according to the present invention in use.

Reference numerals:

the welding jig comprises a base 1, a guide shaft 2, a base upper surface 3, a base outer vertical surface 4, a welding surface size adjusting mechanism 5, a fixed clamp 6, a horizontal guide hole 7, a vertical guide hole 8, a fixed vertical surface plate 9, a movable clamp 10, a horizontal guide through hole 11, a threaded through hole 12, a movable vertical surface plate 13, an adjusting screw 14, front end threads 15, a circular handle 16, a horizontal guide shaft 17, a rectangular groove 18 and pins 19.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.

The auxiliary shearing tool for the lead of the surface-mounted device shown in fig. 1 comprises a base 1 and a welding surface size adjusting mechanism 5;

the welding surface size adjusting mechanism 5 comprises an adjusting part, a movable clamp 10 and a fixed clamp 6;

the base 1 is provided with a base outer vertical surface 4 vertical to the feeding direction, and when the fixed clamp 6 is sleeved on the guide shaft 2, the fixed clamp 6 is provided with a fixed clamp outer vertical surface vertically aligned with the base outer vertical surface 4; thus, the outer vertical surface of the positioning fixture and the outer vertical surface 4 of the base together provide a vertical surface for exposing the part of the lead to be cut. The direction of the base 1 from far away to near the base facade 4 is the feeding direction.

The movable fixture 10 is provided with a groove body to form a movable vertical panel 13 perpendicular to the feeding direction, as shown in fig. 6, one end of a lead connecting device of the surface-mounted device extends into the groove body, so that the vertical part of the pin 19 is attached to the movable vertical panel 13, the horizontal lead section where the part to be cut of the pin 19 is located is fixed by the fixed fixture 6 and the base 1, and the length to be cut is marked through the vertical surface.

The fixed clamp 6 is connected with the movable clamp 10 in a sliding mode along the feeding direction, and the adjusting component is used for adjusting the sliding distance between the movable vertical panel 13 and the outer vertical surface of the fixed clamp.

Two guide shafts 2 are vertically fixed on the upper surface 3 of the base 1, the welding surface size adjusting mechanism 5 can be movably sleeved on the guide shafts 2, and the welding surface size adjusting mechanism 5 is provided with two vertical guide holes 8 matched with the guide shafts 2, so that the welding surface size adjusting mechanism 5 can separate the base 1 and be independently taken down. Since the thickness of the movable vertical plate 13 is known, the distance between the movable vertical plate 13 and the outer vertical surface of the fixed clamp can be adjusted to a required length by the adjusting component with the help of a length measuring tool such as a vernier caliper. Then, the welding surface size adjusting mechanism 5 with the adjusted relative distance is installed on the base 1, the non-cutting end of the horizontal lead segment is vertically and fixedly connected with a lead segment (namely a vertical segment) with one vertical end, when the lead is sent into a gap between the welding surface size adjusting mechanism 5 and the base 1, the vertical segment is clamped and positioned by the vertical panel 13, and the cutting end of the horizontal lead segment is exposed out of the base 1.

Preferably, two vertical guide holes 8 penetrating up and down are formed at two ends of the fixed clamp 6, and the vertical guide holes 8 are matched with the guide shaft 2 for use.

Preferably, the adjustment mechanism includes an adjustment screw 14; the adjusting screw 14 is in threaded connection with the threaded through hole 12 of the movable clamp 10, and the adjusting screw 14 is rotated to drive the movable clamp 10 to move; the adjusting screw 14 is freely rotatable in the horizontal guide hole 7 of the fixed clamp (6). The adjusting screw 14 and the movable clamp 10 form a single-screw pair structure, the horizontal guide hole 7 and the adjusting screw 14 are concentric, but the inner diameter of the horizontal guide hole is larger than the outer diameter of the adjusting screw 14, and the horizontal guide hole 7 is used for supporting the adjusting screw 14.

To facilitate the rotation of the adjusting screw 14, it comprises a front thread 15 and a circular handle 16 placed outside the setting device 6. The front end thread 15 is arranged in the horizontal guide hole 7 and the thread through hole 12 for adjusting the distance, and the diameter of the circular handle 16 is larger than that of the front end thread 15, so that the adjusting screw 14 is prevented from being completely screwed into the fixing clamp 6.

Preferably, the welding surface size adjusting mechanism 5 includes a horizontal guide shaft 17 penetrating the setting jig 6 and the moving jig 10 to achieve a sliding connection.

Preferably, the fixed clamp 6 is provided with a through rectangular groove 18, and the rectangular groove 18 surrounds the movable clamp 10; one end of the fixing clamp 6 close to the groove body is provided with an opening communicated with the rectangular groove 18, and the opening is used for leading wires of the surface-mounted devices to extend into the groove body; the length of the opening is less than the length of the rectangular slot 18 so that the brake caliper 10 cannot exit the opening from the rectangular slot 18 until the rectangular slot 18 limits the distance the brake caliper 10 can move. The rectangular slot 18 and the opening are integrally formed as a T-shaped slot.

In a preferred embodiment of the present invention, wherein the base 1 is a rectangular parallelepiped structure as shown in fig. 2, one end of the upper surface 3 of the base is provided with two guide shafts 2. The connecting line between the two guide shafts 2 is vertical to the feeding direction, and the connecting line direction is set to be the length direction of the movable and fixed clamping apparatus.

As shown in fig. 3, the locking device 6 has two vertical guide holes 8 and a T-shaped slot formed in the middle of the locking device 6, which are formed through the locking device 6 in a direction perpendicular to the upper surface 3 of the base. The holding jig 6 moves up and down along the two vertical guide shafts 2 through the two vertical guide holes 8. Two horizontal guide holes 7 are arranged on the solid part of the fixing device 6 which is not provided with a T-shaped groove in the length direction, one is concentric with the adjusting screw 14, and the other is used for matching with a horizontal guide shaft 17 in a sliding way. The outer vertical surface of the fixing clamp far away from the T-shaped groove is flush with the outer vertical surface 4 of the base close to one side of the vertical guide shaft 2. The T-shaped groove forms the aforementioned opening in the side of the fixed clamp 6 remote from the base outer vertical surface 4, and the fixed clamp 6 is divided into three sections of inconsistent thickness due to the effect of the T-shaped groove. The thick area has high strength, and is beneficial to installing two vertical guide holes 8. The area, which is thin in the middle and is opposite to the movable clamp, is provided with a fixed panel 9, the thickness of the fixed panel 9 is far smaller than the whole thickness of the fixed clamp 6, and when the lead is fixed, the lead is less stressed and is not easy to damage.

As shown in fig. 4, the movable clamp 10 is provided with a horizontal guide through hole 11 and a threaded through hole 12 in the horizontal direction, the movable clamp 10 is nested in the T-shaped groove of the fixed clamp 6, the horizontal guide shaft 17 penetrates through one horizontal guide hole 7 and the horizontal guide through hole 11, and the other horizontal guide hole 7 is concentric with the threaded through hole 12. The side and the bottom of the welding surface length adjusting movable fixture 10 far away from the outer vertical surface 4 of the base are subjected to material cutting treatment, and a movable vertical panel 13 vertical to the feeding direction is formed by means of arranging a groove body. The groove body is used for avoiding the vertical part with a higher lead wire, so that the vertical part is fully blocked by the vertical panel 13. In addition, after the groove body is formed, the thickness of the movable vertical panel 13 is smaller than the whole thickness of the movable fixture 10. When the vernier caliper measures the distance between the movable vertical panel 13 and the movable vertical panel 9, the distance is reduced, the operation is easy, and the measurement precision is high. And thinning the bottom of the movable vertical panel 13 to form a gap with the upper surface 3 of the base, so that a horizontal lead segment can conveniently pass through the movable vertical panel 13. The bottom of the movable vertical plate 13 may not be thinned, the bottom of the movable vertical plate 13 and the bottom of the fixed clamp 6 may be flush with each other, and both the bottoms may abut against the upper surface 3 of the base, respectively.

As shown in fig. 5, the front end of the adjusting screw 14 is a front end thread 15, the rear end is a circular handle 16, the adjusting screw 14 passes through the horizontal guide hole 7 and can freely rotate in the horizontal guide hole 7, and the fixing clamp 6 has a position limit for the adjusting screw 14 along the center direction of the horizontal guide hole 7. The front end thread 15 of the adjusting screw 14 and the thread through hole 12 have the same parameters, and the adjusting screw 14 drives the movable clamp 10 to move so as to adjust the relative distance between the movable clamp 10 and the fixed clamp 6.

When the welding surface size adjusting mechanism is used, the welding surface size adjusting mechanism 5 is firstly taken down from the base 1, and the adjusting screw 14 is rotated to enable the outer vertical surface (close to the base outer vertical surface 4) of the welding surface length adjusting movable vertical surface 13 to be in contact with the inner vertical surface (far from the base outer vertical surface 4) of the fixed vertical surface 9. Then, the scale of the vernier caliper is adjusted to a required length value of the welding surface, the adjusting screw 14 is rotated to enable the distance between the inner vertical surface of the movable vertical panel 13 and the outer vertical surface of the fixed vertical panel 9 to be consistent with the length value set by the vernier caliper, and then a device with the pins formed into a gull wing shape is fed from the top end of the T-shaped groove of the fixed caliper 6 to the direction of the welding surface size adjusting mechanism 5 until the vertical part of the gull wing-shaped pin is abutted against the inner vertical surface of the movable vertical panel 13; artificially lifting the welding face size adjusting mechanism 5 to facilitate the horizontal lead section to pass through the upper surface 3 of the base, loosening the hand and applying force to the welding face length adjusting mechanism 5 from the top end to enable the bottom end of the welding face length adjusting movable vertical face 13 and the upper surface 3 of the base to jointly fix the device lead, and finally using the diagonal pliers to complete the shearing operation of the device lead along the plane formed by the outer vertical face 4 of the base on one side of the base close to the vertical guide shaft and the outer vertical face of the fixed vertical panel 9.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be taken as limiting the invention. Variations, modifications, substitutions and alterations of the above-described embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

The above embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The shearing auxiliary tool for the surface-mounted device lead is characterized by comprising a base (1) and a welding surface size adjusting mechanism (5);

two guide shafts (2) are vertically fixed on the upper surface (3) of the base (1), and the welding surface size adjusting mechanism (5) can be movably sleeved on the guide shafts (2);

the welding surface size adjusting mechanism (5) comprises an adjusting part, a movable clamp (10) and a fixed clamp (6);

the base (1) is provided with a base outer vertical surface (4) perpendicular to the feeding direction, and when the fixing clamp (6) is sleeved on the guide shaft (2), the fixing clamp (6) is provided with a fixing clamp outer vertical surface vertically aligned with the base outer vertical surface (4);

the movable fixture (10) is provided with a groove body to form a movable vertical panel (13) perpendicular to the feeding direction, and one end of the lead connecting device of the surface-mounted device extends into the groove body, so that the vertical part of the lead of the surface-mounted device is attached to the movable vertical panel (13);

the fixed clamp (6) and the movable clamp (10) are connected in a sliding mode along the feeding direction, and the adjusting component is used for adjusting the sliding distance between the movable vertical panel (13) and the outer vertical surface of the fixed clamp.

2. The shear assist tooling for surface mount device leads according to claim 1, wherein the adjustment mechanism comprises an adjustment screw (14); the adjusting screw (14) is in threaded connection with the threaded through hole (12) of the movable clamp (10), and the adjusting screw (14) is rotated to drive the movable clamp (10) to move; the adjusting screw (14) freely rotates in the horizontal guide hole (7) of the fixing clamp (6).

3. The shearing auxiliary tool for the lead of the surface-mounted device according to claim 2, wherein the adjusting screw (14) comprises a front end thread (15) and a circular handle (16) arranged outside the positioning fixture (6).

4. The shearing auxiliary tool for the surface-mounted device lead wire according to claim 1, wherein the welding surface size adjusting mechanism (5) comprises a horizontal guide shaft (17) penetrating through the fixed clamp (6) and the movable clamp (10) to realize the sliding connection.

5. The shearing auxiliary tool for the lead of the surface-mounted device according to claim 1, wherein the fixing clamp (6) is provided with a rectangular groove (18) which penetrates through the upper part and the lower part, and the rectangular groove (18) surrounds the movable clamp (10);

an opening communicated with the rectangular groove (18) is formed in one end, close to the groove body, of the positioning fixture (6), and the opening enables the lead of the surface-mounted device to extend into the groove body;

the length of the opening is smaller than that of the rectangular groove (18), so that the rectangular groove (18) limits the movement distance of the movable clamp (10).

6. The shearing auxiliary tool for the lead of the surface-mounted device according to claim 5, wherein a horizontal guide shaft (17) penetrating through the rectangular groove (18) is fixed at one end of the fixing clamp (6) in the length direction, and one end of the movable clamp (10) in the length direction is in sliding connection with the horizontal guide shaft (17).

7. The shearing auxiliary tool for the lead of the surface-mounted device according to claim 6, wherein the adjusting mechanism is mounted at the other end of the movable clamp (10) in the length direction.

8. The shearing auxiliary tool for the lead of the surface-mounted device according to claim 6, wherein the adjusting mechanism comprises an adjusting screw rod (14), the adjusting screw rod (14) penetrating through the rectangular groove (18) is installed at the other end of the fixing clamp (6) in the length direction, and the other end of the movable clamp (10) in the length direction is in threaded connection with the adjusting screw rod (14).

9. The shearing auxiliary tool for the lead of the surface-mounted device according to claim 1, wherein two vertical guide holes (8) penetrating through the upper part and the lower part of the positioning fixture (6) are formed at two ends of the positioning fixture, and the vertical guide holes (8) are matched with the guide shaft (2) for use.