Welding positioning jig for FPC and DIP part with uneven welding surface

Abstract

The utility model relates to a welding surface non-flat FPC and DIP part welding positioning jig which comprises a bottom plate and a cover plate, the bottom plate is provided with a plurality of positioning areas, and each positioning area is internally provided with an FPC positioning groove used for positioning an FPC and a part positioning groove used for positioning a DIP part; the cover plate comprises pressing areas in one-to-one correspondence with the positioning areas, each pressing area is internally provided with an avoiding hole and two spring PINs, the avoiding holes are located above the welding positions of the pins and the jacks, and the two spring PINs are located on the two opposite sides of the avoiding holes respectively and act on the threaded convex columns downwards. According to the welding positioning jig, the bottom plate is used for conducting initial positioning on the FPC and the DIP part, the cover plate presses the threaded protruding columns through the spring PINs, in this way, the part, in the welding area, of the FPC cannot move at will, and the welding quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of welding positioning, in particular to a welding positioning jig for FPC and DIP parts with uneven welding surfaces. Background Art

[0002] With the continuous advancement of technology, electronic products have gradually occupied the entire lifestyle. Small and exquisite appearance has become an inevitable trend of development. In order to make the products more accurate and exquisite, the precision requirements of assembly are essential. The precision of electronic mounting directly affects the assembly requirements of customers.

[0003] Typically, FPCs (flexible printed circuits) are soldered with a reinforcement sheet and DIP (dual in-line package) components. The reinforcement sheet is located on the back of the FPC, while the DIP components are located on the front of the FPC. These components are soldered separately. This means that the reinforcement sheet is first placed on the SMT machine, then soldered in a reflow oven. After the initial soldering process is complete, the DIP process begins, where the DIP components are placed and then soldered in a wave soldering oven. This method has the following drawbacks:

[0004] 1. Traditional welding process requires two different sets of equipment, which is very costly.

[0005] 2. Normal tinning is done on the gold surface. It is necessary to turn the tin side of the product downward and place it in the carrier avoidance slot, and then insert the DIP parts on it, which increases the operation process and wastes working hours;

[0006] 3. The two welding methods require the development of corresponding aluminum plate carriers and DIP parts furnace carriers, which increases the cost of the fixtures;

[0007] 4. FPC is heated for a long time, which not only increases energy consumption but also has an adverse effect on product quality.

[0008] Therefore, it is necessary to improve the fixture structure to solve the above problems. Summary of the Invention

[0009] The main purpose of the utility model is to provide a welding positioning fixture for FPC and DIP parts with uneven welding surfaces, which helps to improve the double-sided welding efficiency of FPC.

[0010] The utility model achieves the above-mentioned object through the following technical solutions: a welding positioning jig for FPC and DIP parts with uneven welding surfaces, which is used to position the FPC and DIP parts when they are welded into a welded part, wherein the DIP part is densely covered with multiple pins, and the FPC is provided with multiple jacks corresponding to the pins and threaded protrusions on both sides of the pins;

[0011] The invention comprises a bottom plate and a cover plate, wherein the bottom plate is provided with a plurality of positioning areas, each positioning area having an FPC positioning groove for positioning the FPC and a component positioning groove for positioning the DIP component, wherein the FPC positioning groove is connected to the component positioning groove so that the pins of the FPC and the DIP component are inserted into the corresponding jacks when they are in place;

[0012] The cover plate includes pressure areas corresponding to the positioning areas one by one, and each pressure area is provided with a avoidance hole and two spring PINs. The avoidance hole is located above the welding position of the pin and the socket, and the two spring PINs are respectively located on opposite sides of the avoidance hole and act downward on the threaded boss.

[0013] Specifically, a plurality of lower air holes are provided in the area outside the positioning area, and a plurality of upper air holes are provided outside the range of the pressure application area.

[0014] Specifically, one of the lower surface of the cover plate and the upper surface of the base plate is provided with a plurality of positioning posts, and the other is provided with positioning holes corresponding one-to-one to the positioning posts.

[0015] Specifically, a pair of support plates are symmetrically provided on both sides of the lower surface of the bottom plate, and the lowest point of the support plates is not higher than the lowest point of the positioning area.

[0016] Furthermore, each support plate is provided with a plurality of side vents.

[0017] Specifically, the positioning area is C-shaped, and multiple groups of positioning areas 111 are arranged in pairs on the bottom plate. The two positioning areas in each group are 180° rotationally symmetrical and interlaced.

[0018] Specifically, an anti-compression strip is protruded from each of the four sides of the lower surface of the cover plate, and the lower surfaces of all the anti-compression strips are flush and face the bottom plate.

[0019] The beneficial effects of the technical solution of this utility model are:

[0020] The base plate of this soldering fixture is used to initially position the FPC and DIP components, respectively. When the FPC is positioned within its positioning slots and the DIP within its positioning slots, the pins and sockets are plugged into each other. Solder paste surrounds the pins on the sockets, and the solder paste reflows the pins to the sockets. The retaining holes provide a safety mechanism for soldering. During this process, the cover plate uses spring pins to press against the threaded bosses, preventing the FPC from moving within the soldering area and ensuring soldering quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an exploded view of the weldment;

[0022] Figure 2This is a diagram showing the matching relationship between the welding positioning fixture and the weldment in the embodiment;

[0023] Figure 3 This is a diagram showing the positioning relationship between the base plate and a set of welded parts;

[0024] Figure 4 A three-dimensional diagram of the cover.

[0025] The numbers in the figure represent:

[0026] 1-Welding positioning fixture,

[0027] 11- bottom plate, 111- positioning area, 1111- FPC positioning slot, 1112- parts positioning slot, 112- positioning hole, 113- lower vent hole, 114- support plate, 1141- side vent hole;

[0028] 12-cover plate, 121-pressure area, 1211-avoidance hole, 1212-spring PIN, 122-positioning column, 123-anti-pressure strip, 124-upper vent hole;

[0029] 2-welding part, 21-FPC, 211-jack, 212-threaded boss, 22-DIP part, 221-pin. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to specific embodiments.

[0031] Example:

[0032] like Figure 1 As shown, the present invention is a welding positioning fixture for FPC and DIP components with uneven welding surfaces, which is used to position FPC 21 and DIP component 22 when welding them into a welded component 2. The DIP component 22 is densely distributed with multiple pins 221, and the FPC 21 is provided with multiple sockets 211 corresponding to the pins 221 and threaded bosses 212 located on both sides of the pins 221.

[0033] like Figures 1 to 4As shown, the welding positioning fixture 1 includes a base plate 11 and a cover plate 12. The base plate 11 is provided with a plurality of positioning areas 111, and a plurality of lower air holes 113 are provided in the area outside the positioning area 111. Each positioning area 111 has an FPC positioning groove 1111 for positioning the FPC 21 and a part positioning groove 1112 for positioning the DIP part 22. The FPC positioning groove 1111 is connected to the part positioning groove 1112 so that the pin 221 is inserted into the corresponding socket 211 when the FPC 21 and the DIP part 22 are in place; the cover plate 12 includes a pressure area 121 corresponding to the positioning area 111 one by one, and a plurality of upper air holes 124 are provided outside the range of the pressure area 121. Each pressure area 121 is provided with a avoidance hole 1211 and two spring PINs 1212. The avoidance hole 1211 is located above the welding position of the pin 221 and the socket 211, and the two spring PINs 1212 are located at two opposite sides of the avoidance hole 1211 and act downward on the threaded boss 212 .

[0034] The base plate 11 is used to initially position the FPC 21 and the DIP component 22, respectively. When the FPC 21 is located in the FPC positioning groove 1111 and the DIP component 22 is located in the component positioning groove 1112, the pins 221 are plugged into the sockets 211 one by one, and solder paste will surround the pins 221 on the sockets 211. The solder paste will solder the pins 221 to the sockets 211 through reflow soldering. The avoidance holes 1211 play a avoiding role for the welding mechanism. During this process, the cover plate 12 uses the spring PIN 1212 to press the threaded boss 212, so that the part of the FPC 2 in the welding area will not move arbitrarily, ensuring the quality of welding. The upper air vents 124 and the lower air vents 113 allow hot air to circulate relatively smoothly in the welding positioning fixture 1, so that the entire welding part 2 is heated evenly.

[0035] like Figures 2 to 4 As shown, a plurality of positioning posts 122 are provided on the lower surface of the cover plate 12 , and a positioning hole 112 corresponding to the positioning posts 122 is provided on the upper surface of the base plate 11 .

[0036] Because spring pin 1212 presses against the top of threaded boss 212, the relative positioning of cover 12 and FPC 21 is required. The positions of base 11, FPC 21, and DIP component 22 are also determined. Therefore, to ensure that spring pin 1212 is pressed into position, cover 12 and base 11 must be properly aligned. This is achieved by the cooperation between positioning post 122 and positioning hole 112. The positions of positioning post 122 and positioning hole 112 can be interchanged without affecting their functionality.

[0037] like Figure 2 and Figure 3As shown, a pair of support plates 114 are symmetrically provided on both sides of the lower surface of the bottom plate 11 . The lowest point of the support plates 114 is not higher than the lowest point of the positioning area 111 . Each support plate 114 is provided with a plurality of side vents 1141 .

[0038] Because the component positioning grooves 1112 make the base plate 11 very deep at that location, but there is no need to increase the base plate 11's thickness to achieve this depth, the base plate 11 is supported by two support plates 114 on the bottom edge to prevent the base plate 11 from being affected by the uneven surface behind the component positioning grooves 1112. The side vents 1141 also facilitate the flow of hot air to avoid being blocked by the support plates 114.

[0039] like Figure 2 and Figure 3 As shown, the positioning area 111 is C-shaped, and multiple groups of positioning areas 111 are arranged in pairs on the bottom plate 11. The two positioning areas 111 in each group are 180° rotationally symmetrical and interlaced.

[0040] In this embodiment, there are four positioning areas 111, with two positioning areas 111 forming a group, and the two areas interspersed. This allows multiple groups of welded components 2 to be positioned simultaneously using a single base plate 11, and the layout effectively utilizes the plate surface space. A corresponding number of pressure areas 121 are also provided on the cover plate 12.

[0041] like Figure 4 As shown, an anti-pressure strip 123 is protruded from each of the four sides of the lower surface of the cover plate 12 , and the lower surfaces of all the anti-pressure strips 123 are flush and face the bottom plate 11 .

[0042] Only the spring pin 1212 on the cover 12 can contact the threaded boss 212, and the pressure cannot be too great to damage the FPC 21. Therefore, the rest of the lower surface of the cover 12 must maintain a certain height difference from the upper surface of the base plate 11. This is achieved by the anti-pressure strip 123 to support the middle of the cover 12.

[0043] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A welding positioning jig for FPC and DIP components with uneven welding surfaces, used for positioning the FPC and DIP components when welding them together. The DIP component is densely packed with pins, and the FPC is provided with multiple sockets corresponding to the pins and threaded bosses on both sides of the pins; characterized by: The invention comprises a bottom plate and a cover plate, wherein the bottom plate is provided with a plurality of positioning areas, each positioning area having an FPC positioning groove for positioning the FPC and a component positioning groove for positioning the DIP component, wherein the FPC positioning groove is connected to the component positioning groove so that the pins of the FPC and the DIP component are inserted into the corresponding jacks when they are in place; The cover plate includes pressure areas corresponding to the positioning areas one by one, and each pressure area is provided with a avoidance hole and two spring PINs. The avoidance hole is located above the welding position of the pin and the socket, and the two spring PINs are respectively located on opposite sides of the avoidance hole and act downward on the threaded boss.

2. The welding positioning jig for FPC and DIP parts with uneven welding surfaces according to claim 1, characterized in that: A plurality of lower air holes are provided in the area outside the positioning area, and a plurality of upper air holes are provided outside the range of the pressure application area.

3. The welding positioning jig for FPC and DIP parts with uneven welding surfaces according to claim 1, characterized in that: One of the lower surface of the cover plate and the upper surface of the base plate is provided with a plurality of positioning posts, and the other is provided with positioning holes corresponding to the positioning posts one by one.

4. The welding positioning jig for FPC and DIP parts with uneven welding surfaces according to claim 1, characterized in that: A pair of support plates are symmetrically arranged on both sides of the lower surface of the bottom plate, and the lowest point of the support plates is not higher than the lowest point of the positioning area.

5. The welding positioning jig for FPC and DIP parts with uneven welding surfaces according to claim 4, characterized in that: Each supporting plate is provided with a plurality of side vents.

6. The welding positioning jig for FPC and DIP parts with uneven welding surfaces according to claim 1, characterized in that: The positioning area is C-shaped, and multiple groups of positioning areas are arranged in pairs on the bottom plate. The two positioning areas in each group are 180° rotationally symmetrical and interlaced.

7. The welding positioning jig for FPC and DIP parts with uneven welding surfaces according to claim 1, characterized in that: An anti-compression strip is protruded from each of the four sides of the lower surface of the cover plate, and the lower surfaces of all the anti-compression strips are flush and face the bottom plate.

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