Novel backflow jig

Abstract

The utility model discloses a novel backflow jig which comprises a carrier plate and a cover plate matched with the carrier plate to clamp a substrate, the upper surface of the carrier plate is provided with a positioning area used for placing the substrate, and a plurality of first hollow areas used for avoiding components on the substrate are distributed at the bottom of the positioning area. A plurality of first hollowed-out areas are arranged on the base plate, first rubber strips are arranged on the periphery of the outer side of a notch of each first hollowed-out area, a plurality of second hollowed-out areas are arranged on the cover plate, the number and the positions of the second hollowed-out areas correspond to those of the first hollowed-out areas, second rubber strips are arranged on the periphery of the outer side of a notch of each second hollowed-out area, and the first rubber strips correspond to the second rubber strips up and down to press the base plate. The first rubber strip is installed on the carrier plate through a first fixing structure, and the second rubber strip is installed on the cover plate through a second fixing structure. According to the structure, the substrate is prevented from being scratched, bumped or scratched in the backflow process.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor processing, in particular to a novel reflow fixture. Background Art

[0002] SMT (Surface Mount Technology) is a technology that directly mounts electronic components on the surface of a circuit board. With the development of SMT, compared with traditional perforated component technology, SMT allows higher component density and smaller component size, making the equipment more miniaturized and integrated. Among them, the reflow fixture is a key tool in the field of electronic manufacturing. It not only improves production efficiency and welding quality, but also provides necessary support for processing circuit boards of different designs and requirements.

[0003] The reflow fixture is mainly composed of a carrier plate and a cover plate that cooperates with the carrier plate to clamp the substrate. The function of the carrier plate is to support and position the substrate to prevent the substrate from moving or deforming during processing. The function of the cover plate is to press the substrate to prevent the substrate from moving on the carrier plate, and to prevent the substrate from warping during the reflow process while pressing the substrate. The carrier plate is made of metal material with good thermal conductivity, and a number of heat dissipation holes are designed on the surface. Metal ribs are provided on the surface of the carrier plate and the bottom of the cover plate. The use of metal ribs can reduce the contact area between the carrier plate and the cover plate and the substrate. However, the texture of the existing metal ribs is harder than the substrate material, which will cause scratches, bumps, and scratches on the substrate, resulting in a decrease in the yield rate. At the same time, rework of defective products will also lead to problems such as reduced production efficiency. Utility Model Content

[0004] The utility model aims to provide a novel reflow fixture, the structure of which can prevent a substrate from being bumped, scratched and dented during a reflow process, thereby improving product yield.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A novel reflow fixture comprises a carrier plate for supporting and positioning a substrate and a cover plate for pressing the substrate in cooperation with the carrier plate, wherein a positioning area for placing the substrate is provided on the upper surface of the carrier plate, the upper surface of the positioning area is lower than the upper surface of the carrier plate, a plurality of first hollow areas for avoiding components on the substrate are distributed at the bottom of the positioning area, a first rubber strip is provided around the outer side of the notch of each of the first hollow areas, a plurality of second hollow areas corresponding to the positions of the first hollow areas are provided on the cover plate, a second rubber strip is provided around the outer side of the notch of each of the second hollow areas, the first rubber strip corresponds to the second rubber strip one by one up and down, thereby pressing the substrate, the first rubber strip is mounted on the carrier plate through a first fixing structure, and the second rubber strip is mounted on the cover plate through a second fixing structure.

[0007] By adopting the above technical solution, a plurality of first rubber strips are arranged on the carrier plate, and a plurality of second rubber strips are arranged on the cover plate; the plurality of first rubber strips correspond to the plurality of second rubber strips one by one, thereby pressing the substrate to prevent the substrate from moving, deforming or warping during the reflow process, and at the same time reducing the contact area between the carrier plate and the cover plate and the substrate. Moreover, the texture of the rubber strips is softer than that of the substrate, which can prevent the substrate from being scratched, bumped or scratched during the reflow process.

[0008] As a further solution of the utility model: the first fixing structure and the second fixing structure are arranged relatively upward and downward, and both include a through installation groove and a pressure plate. The cross-sections of the first rubber strip and the second rubber strip are T-shaped structures, divided into a narrow part and a wide part. The installation groove is a three-level step groove, which is divided into a first step groove, a second step groove and a third step groove from the inside to the outside. The first rubber strip and the second rubber strip are respectively embedded in the corresponding first step groove and the second step groove, and the narrow parts of the first rubber strip and the second rubber strip both protrude out of the corresponding first step groove. The cross-section of the pressure plate is a T-shaped structure. The pressure plate is embedded in the corresponding second step groove and the third step groove and contacts with the corresponding rubber strip, and the two ends are fixed by screws.

[0009] As a further solution of the utility model: the first fixing structure and the second fixing structure are arranged relatively upward and downward, and both include a fixing column and a T-slot. The cross-sections of the first rubber strip and the second rubber strip are both T-shaped structures, divided into a narrow part and a wide part. One end of the T-slot is provided with a stepped through hole communicating with the T-slot. The shape of the fixing column is adapted to the through hole. During assembly, the first rubber strip and the second rubber strip are respectively inserted into the T-slot through the corresponding through holes, and the narrow parts of the first rubber strip and the second rubber strip protrude out of the corresponding T-slot. Subsequently, the fixing column is inserted into the corresponding through hole and clamped by a retaining spring, thereby fixing the first rubber strip and the second rubber strip in the corresponding T-slot.

[0010] As a further solution of the utility model: the carrier plate has a first positioning structure for positioning the cover plate, and the cover plate has a second positioning structure adapted to the first positioning structure.

[0011] As a further solution of the utility model: the first positioning structure is a positioning pin, and the second positioning structure is a positioning hole.

[0012] As a further solution of the present invention: the hardness range of the first rubber strip and the second rubber strip is 50ShoreA to 90ShoreA.

[0013] As a further solution of the utility model: the first rubber strip and the second rubber strip are both fluororubber. Fluororubber is an organic elastomer copolymerized from fluorine-containing monomers, which has a high temperature resistance of up to 300°C, acid and alkali resistance, oil resistance, chemical corrosion resistance, etc.

[0014] As a further solution of the utility model: the four corners of the positioning area are all provided with R corners.

[0015] In summary, a plurality of first rubber strips are arranged on the carrier, and a plurality of second rubber strips are arranged on the cover; the plurality of first rubber strips correspond to the plurality of second rubber strips one by one, thereby pressing the substrate, effectively preventing the substrate from moving, deforming or warping during the reflow process, and reducing the contact area between the carrier and the cover and the substrate. Moreover, the texture of the rubber strips is softer than that of the substrate, which can prevent the substrate from being scratched, bumped or scratched during the reflow process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings.

[0017] Figure 1 It is a structural schematic diagram of a new type of reflux fixture of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the carrier board in Embodiment 1 of the utility model;

[0019] Figure 3 The figure shows that the carrier plate and the cover plate cooperate to clamp the substrate in the first embodiment;

[0020] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0021] Figure 5 It is a structural schematic diagram of the first rubber strip of the utility model;

[0022] Figure 6 It is a schematic diagram of the structure of the pressure plate in Embodiment 1 of the present utility model;

[0023] Figure 7 It is a structural schematic diagram of the carrier board in Embodiment 2 of the present utility model;

[0024] Figure 8 yes Figure 7 Sectional view at the middle BB;

[0025] Fig. 9 It is a schematic structural diagram of the fixing column in Example 2 of the utility model. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Example 1

[0028] See also Figure 1-4 As shown, the utility model is a new type of reflow fixture, including a carrier plate 10 and a cover plate 20 that cooperates with the carrier plate 10 to clamp the substrate 6. The carrier plate 10 has a first positioning structure 11 for positioning the cover plate 20. The cover plate 20 has a second positioning structure 21 that is adapted to the first positioning structure 11. In this embodiment, the first positioning structure 11 can be a positioning pin, and the number of the positioning pins is multiple and evenly distributed on the edge of the upper surface of the carrier plate 10. The second positioning structure 21 can be a positioning hole, and its number and position correspond to the positioning pin.

[0029] like Figure 2 As shown, a positioning area 12 for placing the substrate 6 is provided on the upper surface of the carrier 10. The upper surface of the positioning area 12 is lower than the upper surface of the carrier 12. The four corners of the positioning area 12 are all provided with R angles 13. This structure makes it easier to put the substrate into the positioning area 12, and the edges and corners of the substrate 6 are not easily scratched by the positioning area 12.

[0030] like Figure 1 and Figure 2 As shown, a plurality of first hollow regions 14 are distributed at the bottom of the positioning region 12 to avoid the components 601 on the substrate 6. A plurality of second hollow regions 22 corresponding to the positions of the first hollow regions 14 are disposed on the cover plate 20.

[0031] like Figure 1 , Figure 2 and Figure 5 As shown, a plurality of first rubber strips 8 are distributed around the outside of the notch of each first hollow area 14. A plurality of second rubber strips 7 are distributed around the outside of the notch of each second hollow area. Among them, the number of the first rubber strips 8 is the same as the number of the second rubber strips 7 and the positions correspond one to one, so as to press the substrate 6. Since rubber is a highly elastic polymer material, it has high elasticity, good wear resistance and thermal stability. At the same time, the texture of rubber is softer than that of the substrate. In this way, rubber strips are used to replace the metal ribs in the prior art. After the substrate is clamped up and down, it can avoid the substrate from being scratched, bumped, or scratched during the reflow process. In this embodiment, the hardness range of the first rubber strip 8 and the second rubber strip 9 is 50Shore A to 90Shore A.

[0032] The first rubber strip 8 and the second rubber strip 7 are both made of fluororubber. The cross-sections of the first rubber strip 8 and the second rubber strip 7 are both T-shaped structures, which are divided into a narrow part and a wide part. It should be noted here that since the thickness of the cover plate is smaller than the thickness of the carrier plate, the cross-section of the second rubber strip 7 is smaller than the cross-section of the first rubber strip 8. Fluororubber is an organic elastomer copolymerized by fluorine-containing monomers, which has a high temperature resistance of up to 300°C, acid and alkali resistance, oil resistance, chemical corrosion resistance, etc.

[0033] like Figure 4 , Figure 5 and Figure 6 As shown, each first rubber strip 8 is mounted on the carrier plate 10 through the corresponding first fixing structure. Each second rubber strip 7 is mounted on the cover plate 20 through the corresponding second fixing structure. The first fixing structure is arranged opposite to the second fixing structure at the upper and lower sides. Here, the first fixing structure is taken as an example, and the first fixing structure includes a through mounting groove 30 and a pressing plate 31 arranged in the mounting groove 30. The mounting groove is a three-level step groove, which is divided into a first step groove 301, a second step groove 302 and a third step groove 303 from the inside to the outside. Each first rubber strip 8 is embedded in the corresponding first step groove 301 and the second step groove 302. The narrow part of the first rubber strip 8 protrudes out of the corresponding first step groove 301. The cross section of the pressing plate 31 is a T-shaped structure. Each pressing plate 31 is embedded in the corresponding second step groove 302 and the third step groove 303 and contacts the corresponding first rubber strip 8, and the two ends are fixed to the carrier plate 10 by screws to press the corresponding first rubber strip 8.

[0034] In summary, a plurality of first rubber strips are arranged on the carrier, and a plurality of second rubber strips are arranged on the cover; the plurality of first rubber strips correspond to the plurality of second rubber strips in upper and lower positions, thereby pressing the substrate to prevent the substrate from moving, deforming or warping during the reflow process, and reducing the contact area between the carrier and the cover and the substrate. Moreover, the texture of the rubber strips is softer than that of the substrate, which can prevent the substrate from being scratched, bumped or scratched during the reflow process.

[0035] Example 2

[0036] Combination Figure 7 , Figure 8 and Fig. 9 As shown, the difference between this embodiment and the first embodiment is that the first fixing structure and the second fixing structure are arranged opposite to each other in the upper and lower parts, and both include a fixing column 40 and a T-slot 41. A stepped through hole 42 communicating with the T-slot 41 is opened at one end of the T-slot 41. The shape of the fixing column 40 is adapted to the through hole. Here, taking the first fixing structure as an example, during assembly, the first rubber strip 8 is inserted into the T-slot 41 through the through hole 42, and the narrow part of the first rubber strip 8 protrudes out of the corresponding T-slot 41. Subsequently, the fixing column 40 is inserted into the through hole 42 and clamped by the retaining spring 43, thereby fixing the first rubber strip in the T-slot 41.

[0037] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A new type of reflow fixture, comprising a carrier plate for supporting and positioning a substrate and a cover plate for pressing the substrate in cooperation with the carrier plate. It is characterized in that A positioning area for placing a substrate is provided on the upper surface of the carrier, the upper surface of the positioning area is lower than the upper surface of the carrier, a plurality of first hollow areas for avoiding components on the substrate are distributed at the bottom of the positioning area, a first rubber strip is provided around the outer side of the notch of each of the first hollow areas, a plurality of second hollow areas corresponding to the positions of the first hollow areas are provided on the cover plate, a second rubber strip is provided around the outer side of the notch of each of the second hollow areas, the first rubber strip corresponds to the second rubber strip one by one up and down, so as to press the substrate, the first rubber strip is mounted on the carrier plate through a first fixing structure, and the second rubber strip is mounted on the cover plate through a second fixing structure.

2. According to the new reflow fixture described in claim 1, It is characterized in that The first fixing structure and the second fixing structure are arranged opposite to each other in upper and lower parts, and both include a through installation groove and a pressure plate. The cross-sections of the first rubber strip and the second rubber strip are both T-shaped structures, which are divided into a narrow part and a wide part. The installation groove is a three-level step groove, which is divided into a first step groove, a second step groove and a third step groove from the inside to the outside. The first rubber strip and the second rubber strip are respectively embedded in the corresponding first step groove and the second step groove, and the narrow parts of the first rubber strip and the second rubber strip both protrude out of the corresponding first step groove. The cross-section of the pressure plate is a T-shaped structure. The pressure plate is embedded in the corresponding second step groove and the third step groove and contacts with the corresponding rubber strip, and the two ends are fixed by screws.

3. According to the new reflow fixture described in claim 1, It is characterized in that The first fixing structure and the second fixing structure are arranged opposite to each other in upper and lower parts, and both include fixing columns and T-shaped slots. The cross-sections of the first rubber strip and the second rubber strip are both T-shaped structures, which are divided into a narrow part and a wide part. One end of the T-shaped slot is provided with a stepped through hole communicating with the T-shaped slot. The shape of the fixing column is adapted to the through hole. During assembly, the first rubber strip and the second rubber strip are respectively inserted into the T-shaped slot through the corresponding through holes, and the narrow parts of the first rubber strip and the second rubber strip protrude out of the corresponding T-shaped slot. Subsequently, the fixing column is inserted into the corresponding through hole and clamped by a retaining spring, thereby fixing the first rubber strip and the second rubber strip in the corresponding T-shaped slot.

4. According to the new reflow fixture described in claim 1, It is characterized in that The carrier plate has a first positioning structure for positioning the cover plate, and the cover plate has a second positioning structure matched with the first positioning structure.

5. According to the new reflow fixture described in claim 4, It is characterized in that The first positioning structure is a positioning pin, and the second positioning structure is a positioning hole.

6. According to the new reflow fixture of claim 1, It is characterized in that The hardness of the first rubber strip and the second rubber strip is in the range of 50 Shore A to 90 Shore A.

7. According to the new reflow fixture of claim 1, It is characterized in that The first rubber strip and the second rubber strip are both made of fluororubber.

8. According to the new reflow fixture of claim 1, It is characterized in that The four corners of the positioning area are all provided with R corners.

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