CN216441840U

CN216441840U - Paster piezo-resistor welding tool

Info

Publication number: CN216441840U
Application number: CN202122817217.XU
Authority: CN
Inventors: 段花山; 吕志昆; 孔凡伟
Original assignee: Shandong Jingdao Microelectronics Co ltd
Current assignee: Shandong Jingdao Microelectronics Co ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-05-06
Anticipated expiration: 2031-11-17

Abstract

The utility model relates to a welding jig for a chip piezoresistor, belonging to the field of packaging and welding of electronic products, comprising a support plate made of aluminum, wherein the surface of the support plate is provided with a working position for placing a frame and a chip; the cover plate is correspondingly arranged above the carrier plate, and through holes which are in one-to-one correspondence with the working positions are formed in the surface of the cover plate; the pressing nail is movably arranged in the through hole, the upper end of the pressing nail is provided with a limiting block, and the lower end surface of the pressing nail protrudes downwards to the lower surface of the cover plate when the cover plate is horizontally placed, so that the pressing nail is pressed on a target product on the working position to combine the frame and the chip; the utility model utilizes the dead weight of the press nail to press on the surface of a product, thereby avoiding the phenomena of welding deviation, pin pressing damage and open welding caused by strong pressing and thermal expansion of the traditional jig.

Description

Paster piezo-resistor welding tool

Technical Field

The utility model relates to the technical field of electronic product packaging and welding, in particular to a welding jig for a surface mounted varistor.

Background

With the continuous development of electronic products, the yield of the electronic products is higher and higher, the chip type piezoresistor is more and more popular in the market, and the demand on the product of the chip type piezoresistor is increased rapidly, so that the requirements on the product yield and the production efficiency are higher and higher. In the welding process of the piezoresistor, the whole material sheet passes through a high-temperature welding furnace, the frame is heated and deformed after welding, and pins are seriously pressed and damaged due to deviation, open welding and injection molding, so that batch production cannot be realized. The reason is that the piezoresistor is welded at high temperature in the welding furnace by being placed in the welding jig, the traditional welding jig is generally a carrier plate and a cover plate made of carbon plates, the carrier plate and the cover plate clamp a target product in the middle to be fixed and sent to the welding furnace, the welding jig is not suitable for a piezoresistor frame, the longer the frame is, the larger the thermal expansion deformation is, and therefore the material sheet is easily deviated and crushed under the bearing of the traditional jig.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of the prior art and provides a welding jig for a Surface Mount Device (SMD) piezoresistor, which can correct welding deviation, pin crush and open welding.

The technical scheme for solving the technical problems is as follows: a welding jig for surface-mounted piezoresistors is characterized by comprising

The carrier plate is made of aluminum, and the surface of the carrier plate is provided with a working position for placing the frame and the chip;

the cover plate is correspondingly arranged above the carrier plate, and through holes which are in one-to-one correspondence with the working positions are formed in the surface of the cover plate;

and the pressing nail is movably arranged in the through hole, the upper end of the pressing nail is provided with a limiting block, and the lower end surface of the pressing nail protrudes downwards to the lower surface of the cover plate when the cover plate is horizontally placed, so that the pressing nail is pressed on a target product on the working position to combine the frame and the chip.

Furthermore, the cover plate is made of carbon.

Furthermore, the diameter of the limiting block is larger than that of the through hole.

Furthermore, the bottom end of the pressing nail is provided with an action block, and the diameter of the action block is larger than that of the through hole.

The utility model has the beneficial effects that: according to the utility model, the aluminum carrier plate, the through hole and the press nail on the surface of the cover plate are arranged, the press nail is movably arranged in the through hole, and the press nail is pressed on the surface of a product by the dead weight of the press nail during working, so that the phenomena of welding deviation, pin pressing damage and welding failure caused by strong pressing and thermal expansion of a traditional jig are avoided.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic perspective view of a carrier plate according to the present invention;

FIG. 4 is a schematic plan view of the cover plate of the present invention;

FIG. 5 is a schematic view of the structure of a press stud according to an embodiment of the present invention;

FIG. 6 is a schematic side view of the present invention in operation;

FIG. 7 is a schematic cross-sectional view of the present invention in its operating state;

FIG. 8 is a schematic view of the construction of a press stud according to another embodiment of the present invention;

in the figure: 1. the structure comprises a carrier plate, 2 parts of a cover plate, 3 parts of through holes, 4 parts of press nails, 41 parts of limiting blocks and 42 parts of action blocks.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the utility model.

As shown in fig. 1 to 7, the welding jig for the chip piezoresistor of the embodiment includes

The carrier plate 1 is made of aluminum materials to replace the conventional carbon materials, and the surface of the carrier plate 1 is provided with a working position for placing a frame and a chip;

the cover plate 2 is made of carbon and is correspondingly arranged above the carrier plate 1, and through holes 3 which are in one-to-one correspondence with the working positions are formed in the surface of the cover plate;

the pressing nail 4 is movably arranged in the through hole 3, the upper end of the pressing nail 4 is provided with a limiting block 41, the diameter of the limiting block 41 is larger than that of the through hole 3, and the pressing nail 4 is used for preventing the pressing nail 4 from sliding out when the pressing nail 4 moves in the through hole 3; the lower end surface of the press pin 4 protrudes downward from the lower surface of the cover plate 2 when the cover plate 2 is horizontally rested, and is used for pressing the target product on the work site to combine the frame and the chip.

Before use, the press pin 4 is firstly put into the through hole 3 of the cover plate 2. When the device is used, the carrier plate 1 is firstly placed into the frame, then the chip is placed into the frame, finally the cover plate 2 with the press pins 4 is pressed on the carrier plate 1, at the moment, the press pins 4 are pressed aiming at the free falling body of each product, the frame is combined with the chip by the gravity of the press pins 4, and finally the device is welded and molded through a high-temperature furnace. The expansion coefficient of the aluminum cover plate is close to that of the copper frame, so that the problem of thermal expansion of the frame and a jig during welding is solved, and the pressing pin is matched with the frame pressed according to self weight, so that tests prove that the structure can greatly reduce the phenomena of welding deviation, pin pressing damage and open welding caused by the welding jig, and improve the yield of products.

As shown in fig. 8, on the basis of the above embodiment, in another embodiment of the present invention, an action block 42 is further provided at the bottom end of the pressing nail, and the diameter of the action block 42 is larger than that of the through hole 3. The purpose of setting up this effect piece is firstly satisfied the pressfitting to the product, secondly prevents that apron 2 from taking off the back transfer in-process and pressing nail 4 by roll-off in the through-hole 3, has practiced thrift the binding process.

Claims

1. A welding jig for surface-mounted piezoresistors is characterized by comprising

The carrier plate (1) is made of aluminum, and the surface of the carrier plate is provided with a working position for placing the frame and the chip;

the cover plate (2) is correspondingly arranged above the carrier plate (1), and the surface of the cover plate is provided with through holes (3) which correspond to the working positions one by one;

and the pressing nail (4) is movably arranged in the through hole (3), the upper end of the pressing nail (4) is provided with a limiting block (41), and the lower end face of the pressing nail (4) is protruded downwards to the lower surface of the cover plate (2) when the cover plate (2) is horizontally placed for pressing a target product on the working position to combine the frame and the chip.

2. The welding jig for the patch piezoresistor according to the claim 1 is characterized in that the cover plate (2) is made of carbon.

3. The paster varistor welding tool according to claim 1, characterized by, the diameter of stopper (41) is greater than through-hole (3) diameter.

4. The paster varistor welding tool of claim 1, characterized by, the bottom of the pressure nail (4) is equipped with an action piece (42), the diameter of action piece (42) is greater than the diameter of through-hole (3).