WO2018214372A1

WO2018214372A1 - Printed circuit board manufacturing process including extruding nuts

Info

Publication number: WO2018214372A1
Application number: PCT/CN2017/104704
Authority: WO
Inventors: 吴军权; 陈春; 林映生; 卫雄
Original assignee: 惠州市金百泽电路科技有限公司; 深圳市金百泽电子科技股份有限公司; 西安金百泽电路科技有限公司
Priority date: 2017-05-24
Filing date: 2017-09-30
Publication date: 2018-11-29
Also published as: CN107182170A; CN107182170B

Abstract

Disclosed is a printed circuit board manufacturing process including extruding nuts. The manufacturing process comprises the following steps: preparing, according to the shapes and features of the extruding nuts (20), an auxiliary jig (10) for placing the extruding nuts (20), with several nut placement holes (13) in cooperation with the extruding nuts (20) being provided on the auxiliary jig (10); placing the extruding nuts (20) in the nut placement holes (13) on the auxiliary jig (10); carrying out pre-fixation of a PCB (40) and the extruding nuts (20); after the pre-fixation is completed, using a laminating device for the conventional production of the PCB (40) to embed the extruding nuts (20) into the PCB (40), and riveting installation of the extruding nuts (20) being completed; and finally, carrying out processing and treatment for the shape of the PCB (40). The printed circuit board (40) manufacturing process including the extruding nuts (20) has the advantages of a high riveting efficiency, a high precision and a good flatness, allows a jig to be utilized again, and dispenses with a special riveting apparatus for the extruding nuts (20).

Description

Printed circuit board manufacturing process with squeeze nut

Technical field

The invention relates to the technical field of printed circuit board manufacturing, in particular to a manufacturing process of a printed circuit board comprising an extruded nut.

Background technique

The squeeze nut, also called self-fastening nut, is a kind of nut applied to a thin plate or sheet metal, with embossing teeth and a guiding groove at one end, a nut column with one end of the embossing tooth and the guiding groove, and the other end is A nut head with a round shape. When in use, the teeth of the squeeze nut can be squeezed into the plate by pressure, plastic deformation of the periphery of the hole, and the deformation is squeezed into the guide groove, thereby generating a locking effect.

The manufacturing method of the extruded nut PCB is usually completed by completing the finished product of the PCB and then installing the extruded nut. At present, the installation of the extruded nut usually requires a special nut riveting machine to individually install the nut. In the actual use process, these nut riveting presses are not dedicated to the PCB. Improper adjustment of the pressure is very easy to damage the finished PCB, and the mold is also more elaborate. The specifications for the use of extruded nuts on PCBs are often complex and varied. When faced with a large number of products and facing a variety of different types of extruded nuts, if multiple equipment is purchased to improve the processing efficiency of the equipment, Compared to cheap nuts, it is often costly.

Summary of the invention

The invention provides a manufacturing process of a printed circuit board with high riveting efficiency, high precision, good flatness, recyclability of the jig and the elimination of the special extrusion nut riveting equipment for the configuration.

The invention can be implemented by the following technical solutions:

A printed circuit board manufacturing process comprising a squeeze nut, comprising the steps of:

In the first step, the squeezing nut assists the manufacture of the jig, and the auxiliary jig for placing the squeezing nut is prepared according to the shape and characteristics of the squeezing nut, and the auxiliary jig is provided with a plurality of matching nuts Nut placement hole;

In the second step, the pressing nut is placed. After the auxiliary jig is prepared in the first step, the pressing nut is placed in the nut placing hole on the auxiliary jig;

The third step is to pre-fix the PCB and the extrusion nut. First, a plurality of nut mounting holes are formed on the PCB to match the pressing nut. After the nut mounting hole is processed, the PCB is placed above the extrusion nut. The nut mounting hole on the PCB is corresponding to the pressing nut, and the pre-fixed PCB and the auxiliary jig with the pressing nut are pre-fixed by the rivet;

The fourth step, the installation of the squeeze nut, using the laminating equipment used in the conventional production of the PCB, the squeeze nut is embedded in the PCB, and the riveting and pressing installation of the squeeze nut is completed;

The fifth step, PCB shape processing, after the installation of the extrusion nut, remove the auxiliary fixture, place the auxiliary fixture on the machine for PCB shape processing, complete the PCB shape processing, remove the squeeze Press the nut of the PCB, leave the auxiliary fixture on the machine, and place the next PCB with the extruded nut for shape processing.

Further, the auxiliary fixture according to the first step includes a hole fixture plate and a fixture pad, and the hole fixture plate is provided with a plurality of nut placement holes that cooperate with the pressing nut, The perforated jig plate and the jig plate are placed in order from top to bottom.

Further, the hole fixture plate and the fixture pad are respectively provided with corresponding positions of the holes The hole, the hole fixture plate and the fixture pad are fixed by a rivet connection.

Further, the perforated jig plate and the jig pad are epoxy resin plates made of epoxy resin.

Further, the diameter of the nut placement hole on the perforated jig plate is 0.05 mm larger than the diameter of the nut head of the extrusion nut.

Further, the thickness of the perforated jig plate is the same as the thickness of the nut head in the pressing nut, and the thickness of the jig pad is greater than 1 mm.

Further, the nut mounting hole diameter on the PCB in the third step is slightly smaller than the large diameter of the nut column of the pressing nut.

Further, the installation of the squeeze nut in the fourth step, specifically, after completing the pre-fixation of the third step PCB and the squeeze nut, respectively, an epoxy pad is placed under the auxiliary jig and the top of the PCB. The plate is provided with a steel plate on the outer surfaces of the upper and lower epoxy pads, and then the pressing nut is embedded in the PCB by using a laminating device to complete the installation of the extruded nut.

Further, after the PCB profile processing in the fifth step is completed, after the installation of the squeeze nut is completed, the PCB with the squeeze nut and the auxiliary jig are sequentially taken out, and the hole fixture plate and the rule in the auxiliary jig are removed. With the backing plate removed, place the perforated jig plate with the nut placement hole on the machine table pad, and then place the PCB with the nut side facing down, so that the extrusion nut is aligned with the nut placement hole cover. Shape processing on the hole fixture board.

Further, in the PCB shape processing in the fifth step, when the shape processing is performed, the depth of the cutter is adjusted, and the lower cutter depth of the cutter is the surface sinking of the hole fixture board. 0.2mm depth.

The manufacturing process of the printed circuit board with the extruded nut of the invention has the following beneficial effects:

First, the riveting efficiency is high. The invention realizes the full-plate riveting of the nut by making the auxiliary jig for the squeeze nut pressing, and the riveting method with the traditional single nut in turn can carry out the whole plate. The batch riveting of the nuts greatly improves the riveting efficiency of the extruded nut;

Secondly, the riveting precision is high. The invention adopts the preparation of the auxiliary jig, and the setting of the nut placing hole on the perforated jig plate in the auxiliary jig, so that the pressing nut is first placed in the auxiliary jig and then passed through the PCB. For the setting of the nut mounting hole, first place the PCB on the top of the auxiliary fixture to make the nut mounting hole on the PCB correspond to the pressing nut on the auxiliary fixture, and then pre-fix the PCB and the auxiliary fixture by the rivet, and finally Then, the pressing nut is mounted on the PCB by pressing with a conventional laminating device. The nut is placed first, and then the nut mounting hole on the PCB is aligned with the pressing nut and then pressed together, thereby greatly improving the nut. The precision of riveting and the positional accuracy of riveting are accurate to ±50um;

Third, the flatness is good. By using the combination of the hole fixture plate and the fixture pad in the auxiliary fixture, the squeeze nut is placed in the nut placement hole on the hole fixture plate on the upper part of the fixture pad, The fixture pad plays the role of full plate support on the squeeze nut, the nut does not tilt after the riveting, and the flatness is kept within 0.1 mm;

Fourth, the PCB can be effectively protected, and the auxiliary nut is used to place the extrusion nut, and then the PCB and the auxiliary fixture are pre-fixed. After the pre-fixation, the epoxy is placed on the top of the PCB and under the auxiliary fixture. a backing plate and a steel plate on the outer surface of the epoxy backing plate, and then using lamination The device is pressed, which effectively avoids damage to the PCB caused by the pressing process, and effectively protects the PCB;

Fifth, the auxiliary fixture can be recycled. After the installation of the extrusion nut is completed, the auxiliary fixture can be used as a backing plate in the process of processing the shape of the subsequent PCB, thereby providing protection for the PCB during the shape production process. After the PCB shape processing is completed, the PCB is removed, and then the next PCB is placed for shape processing, without replacing the new pad, recycling, and improving the utilization rate of the auxiliary fixture;

Sixth, the cost is low. The manufacturing process of the printed circuit board with the squeeze nut of the invention not only realizes the full plate riveting of the nut, but also adopts the conventional laminating equipment commonly used in the PCB production process. The nut riveting can be completed, and the special extrusion nut riveting equipment is not needed, which saves the equipment cost and greatly reduces the factory cost.

DRAWINGS

1 is a schematic view showing a state in which an extrusion nut is attached to an auxiliary nut of a squeeze nut according to the present invention;

2 is a schematic view showing a state in which a PCB and an auxiliary fixture are pre-fixed according to the present invention;

Figure 3 is a schematic view showing the state before lamination of the PCB and the extruded nut of the present invention;

4 is a schematic view showing the processing and installation of a PCB profile in the present invention;

Figure 5 is a schematic view showing the processing state of the PCB outline in the present invention;

Figure 6 is an enlarged view of I in Figure 5.

detailed description

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the products of the present invention will be further described in detail below with reference to the examples and the accompanying drawings.

As shown in FIG. 1 to FIG. 6, a printed circuit board manufacturing process including the extruded nut 20 includes the following steps:

In the first step, the squeezing nut 20 assists in the manufacture of the jig 10, and the auxiliary jig 10 for placing the squeezing nut 20 is prepared according to the shape and characteristics of the squeezing nut 20, and the auxiliary jig 10 is provided with a plurality of The squeezing nut 20 is matched with the nut placing hole 13 . Specifically, the auxiliary jig 10 includes a hole jig plate 12 and a jig pad 11 , and the perforated jig plate 12 is provided with a plurality of squeezing plates The nut 18 is fitted with a nut placement hole 13 , and the perforated jig plate 12 and the jig pad 11 are sequentially placed from top to bottom, and the perforated jig plate 12 and the jig pad 11 are respectively provided. The positioning hole 14 corresponding to the hole position, the hole fixing tool board 12 and the jig pad 11 are connected and fixed by the rivet 30, and the perforated jig plate 12 and the jig pad 11 are made of epoxy resin. The epoxy resin plate, the nut placement hole 13 on the perforated jig plate 12 has a hole diameter larger than the diameter of the nut head 22 of the pressing nut 20 by 0.05 mm, and the thickness of the perforated jig plate 12 and the pressing nut 20 The thickness of the middle nut head 22 is the same, and the thickness of the jig pad 11 is greater than 1 mm;

In the second step, the pressing nut 20 is placed. After the preparation of the auxiliary jig 10 in the first step, the pressing nut 20 is placed in the nut placing hole 13 on the auxiliary jig 10;

The third step is pre-fixing of the PCB 40 and the pressing nut 20. First, a plurality of nut mounting holes 41 are formed on the PCB 40 to cooperate with the pressing nut 20. The nut mounting hole 41 on the PCB 40 has a slightly smaller hole diameter than the extrusion. The large diameter of the nut post 21 of the nut 20, after the nut mounting hole 41 is processed, the PCB 40 is placed above the pressing nut 20, so that the nut mounting hole 41 on the PCB 40 corresponds to the pressing nut 20, and is pre-fixed by the rivet 30. PCB40 and auxiliary with placed compression nut 20 Fixture 10;

In the fourth step, the installation of the squeeze nut 20 is performed by inserting the squeeze nut 20 into the PCB 40 using the laminating equipment used for the conventional production of the PCB 40, and completing the riveting and mounting of the squeeze nut 20, specifically, completing the third step of the PCB 40 and After the pre-fixing of the squeezing nut 20, an epoxy pad 50 is placed on the lower surface of the auxiliary jig 10 and the upper surface of the PCB 40, and a steel plate 60 is respectively disposed on the outer surfaces of the upper and lower epoxy pads 50, and then The extrusion nut 20 is mounted by inserting the squeeze nut 20 into the PCB 40 using a laminating apparatus.

The fifth step is to process the outer shape of the PCB 40. After the installation of the squeeze nut 20 is completed, the auxiliary jig 10 is removed. Specifically, the PCB 40 and the auxiliary jig 10 with the squeeze nut 20 in the auxiliary jig 10 are sequentially taken out. The perforated jig plate 12 and the jig plate 11 in the auxiliary jig 10 are disassembled, and the perforated jig plate 12 with the nut placement hole 13 is laid on the machine table pad 70, and then the PCB 40 is carried. The side of the nut faces downward, so that the pressing nut 20 is aligned with the nut placing hole 13 to cover the hole fixture plate 12, and the outer shape processing is performed, and when the outer shape processing is performed, the depth of the lower cutting knife is adjusted by the milling cutter 80. The lower cutting depth of the milling cutter 80 is a depth of 0.2 mm of the surface of the perforated jig 12, that is, the value of A in Fig. 6 is 0.2 mm.

The manufacturing process of the printed circuit board with the squeeze nut 20 of the invention adopts the method of installing the squeeze nut 20 by the auxiliary jig 10 to manufacture the squeeze nut 20PCB40, and the positional deviation can be controlled within 0.2 mm, and the installation flatness does not exceed 0.1. Mm, and the thermal reliability is good, the nut pull-out force is greater than 100N. Specifically, by making the auxiliary jig 10 for squeezing the pressing nut 20, the full-plate riveting of the nut is realized, and the riveting method of the conventional single nut is sequentially performed, and the batch of the plurality of nuts of the whole plate can be performed. The riveting pressure greatly improves the riveting efficiency of the pressing nut 20; the present invention assists the setting of the nut placing hole 13 on the perforated jig 12 in the jig 10 by the preparation of the auxiliary jig 10, so that the pressing nut 20 is provided. Firstly, it is fixed in the auxiliary fixture 10, and then through the setting of the nut mounting hole 41 on the PCB 40, the PCB 40 is first placed above the auxiliary fixture 10 to make the nut mounting hole 41 on the PCB 40 and the pressing nut on the auxiliary fixture 10. 20 one-to-one correspondence, then the PCB 40 and the auxiliary jig 10 are pre-fixed by the rivet 30, and finally the pressing nut 20 is mounted on the PCB 40 by pressing with a conventional laminating device, and the pressing nut 20 is placed first. The nut mounting hole 41 on the PCB 40 is aligned with the pressing nut 20 and then pressed together, thereby greatly improving the precision of the nut riveting, and the position accuracy of the riveting is accurate to ±50 um; The combination of the plate 12 and the jig pad 11 is used to place the pressing nut 20 in the nut placing hole 13 on the perforated jig plate 12 on the upper portion of the jig pad 11, and the jig pad 11 is pressed against the pressing nut 20. Plays the role of full board support, the nut will not tilt after riveting, and it is flat It is kept within 0.1 mm; the pressing nut 20 is placed by the auxiliary jig 10 of the present invention, and the pre-fixing of the PCB 40 and the auxiliary jig 10 is performed. After the pre-fixing, the upper surface of the PCB 40 and the auxiliary jig 10 are respectively disposed. The epoxy pad 50 is provided with a steel plate 60 on the outer surface of the epoxy pad 50, and then pressed by a laminating device, which effectively avoids damage to the PCB 40 caused by the pressing process, and effectively protects the PCB 40; the auxiliary fixture 10 After the installation of the extrusion nut 20 is completed, it can be used as a backing plate during the processing of the shape of the subsequent PCB 40, thereby providing protection for the PCB 40 during the shape forming process, and at the same time, when the PCB 40 shape processing is completed, the PCB 40 is removed. Then, the next PCB 40 can be placed for shape processing, no need to replace the new pad, and the cycle is used to improve the utilization rate of the auxiliary jig 10; The manufacturing process of the printed circuit board of the press nut 20 is not only realized by the manufacture of the auxiliary jig 10, but also the riveting of the full plate of the nut, and the conventional laminating equipment commonly used in the production process of the PCB 40 can be used for the riveting of the nut without configuration. The special extrusion nut 20 riveting equipment saves the equipment cost and greatly reduces the factory cost.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention in any way; and those skilled in the art can smoothly implement the present invention as shown in the drawings and described above. However, those skilled in the art can make equivalent changes to the changes, modifications and evolutions made by the above-disclosed technical contents without departing from the technical scope of the present invention. At the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments in accordance with the essential techniques of the present invention are still within the scope of the technical solutions of the present invention.

Claims

A printed circuit board manufacturing process comprising a squeeze nut, comprising the steps of:

In the first step, the squeezing nut assists the manufacture of the jig, and the auxiliary jig for placing the squeezing nut is prepared according to the shape and characteristics of the squeezing nut, and the auxiliary jig is provided with a plurality of matching nuts Nut placement hole;

In the second step, the pressing nut is placed. After the auxiliary jig is prepared in the first step, the pressing nut is placed in the nut placing hole on the auxiliary jig;

The third step is to pre-fix the PCB and the extrusion nut. First, a plurality of nut mounting holes are formed on the PCB to match the pressing nut. After the nut mounting hole is processed, the PCB is placed above the extrusion nut. The nut mounting hole on the PCB is corresponding to the pressing nut, and the pre-fixed PCB and the auxiliary jig with the pressing nut are pre-fixed by the rivet;

The fourth step, the installation of the squeeze nut, using the laminating equipment used in the conventional production of the PCB, the squeeze nut is embedded in the PCB, and the riveting and pressing installation of the squeeze nut is completed;

The fifth step, PCB shape processing, after the installation of the extrusion nut, remove the auxiliary fixture, place the auxiliary fixture on the machine for PCB shape processing, complete the PCB shape processing, remove the squeeze Press the nut of the PCB, leave the auxiliary fixture on the machine, and place the next PCB with the extruded nut for shape processing.
The manufacturing process of the printed circuit board containing the squeeze nut according to claim 1, wherein the auxiliary fixture in the first step comprises a hole fixture plate and a fixture pad, and the hole treatment The plate has a plurality of nut placement holes that cooperate with the pressing nut, and the perforated jig plate And the fixture pad is placed from top to bottom.
The manufacturing process of the printed circuit board with the squeeze nut according to claim 2, wherein the hole-fixing tool plate and the fixture plate are provided with positioning holes corresponding to the holes, the holes The fixture plate and the fixture pad are fixed by rivets.
The manufacturing process of the printed circuit board with the extruded nut according to claim 3, wherein the perforated jig plate and the jig plate are epoxy resin plates made of epoxy resin.
The manufacturing process of the printed circuit board with the extruded nut according to claim 4, wherein the hole of the nut placement hole on the hole-fixing jig plate is 0.05 mm larger than the diameter of the nut head of the pressing nut.
The manufacturing process of the printed circuit board with the extruded nut according to claim 5, wherein the thickness of the hole-fixing plate is the same as the thickness of the nut head in the pressing nut, and the fixing plate of the jig The thickness is greater than 1mm.
The manufacturing process of the printed circuit board with a squeeze nut according to claim 1, wherein the diameter of the nut mounting hole on the PCB in the third step is slightly smaller than the diameter of the nut column of the extruded nut.
The manufacturing process of the printed circuit board containing the squeeze nut according to claim 1, characterized in that: the installation of the squeeze nut in the fourth step, specifically, the completion of the third step of the PCB and the extrusion nut After fixing, an epoxy pad is placed under the auxiliary fixture and on the top of the PCB, and a steel plate is respectively disposed on the outer surfaces of the upper and lower epoxy pads, and then the layer is used. The press device inserts the squeeze nut into the PCB to complete the installation of the squeeze nut.
The manufacturing process of the printed circuit board with the squeeze nut according to claim 1, wherein the PCB shape processing in the fifth step is completed, and after the installation of the squeeze nut, the PCB with the squeeze nut is used. And the auxiliary jig is taken out in turn, the perforated jig plate and the jig plate in the auxiliary jig are disassembled, and the perforated jig plate with the nut placement hole is laid on the machine pad, and then the PCB is taken With the nut side facing down, the extrusion nut is aligned with the nut placement hole cover on the perforated fixture plate for contour processing.
The manufacturing process of the printed circuit board with the squeeze nut according to claim 9, wherein the outer shape of the PCB in the fifth step is processed, and the depth of the lower edge of the cutter is adjusted during the outer shape processing. The lower cutter depth of the milling cutter is 0.2 mm deep at the surface of the hole fixture plate.