Technology for eliminating air bag bumps of FPC pressing machine

Abstract

The invention discloses a process for eliminating air bag bumps of an FPC (Flexible Printed Circuit) pressing machine, and aims to provide the process for eliminating the air bag bumps of the FPC pressing machine, so that the pressure of the FPC pressing machine is more uniform, and the quality of finished products is well improved. A surface roughening treatment process is adopted to replace the design of a plurality of vertically and horizontally crossed air guide grooves, when the lower surface of the air bag mounting plate is rough, the uneven microstructure of the air bag mounting plate can increase a gap between the air bag mounting plate and the contact surface of the air bag, and the tiny concave-convex structures provide more channels and gaps for air molecules, so that the air bag mounting plate is more uniform in air flow. When air moves on the rough surface, the air can be diffused and permeated more easily through the channels and the gaps, and therefore the air bag swelling phenomenon of the FPC pressing machine is eliminated. The invention is applied to the technical field of FPC pressing machines.

Description

Technical Field

[0001] The invention relates to a process applied in a flexible circuit board pressing machine, and in particular to a process for eliminating air bag bulging of an FPC pressing machine. Background Art

[0002] The Chinese patent with publication number CN102806747B discloses an airbag assembly in a vacuum laminating machine for a flexible printed circuit board, which includes a rubber receiving bottom plate and a rubber fixing plate, which are combined up and down to form a cavity, the airbag is contained in the cavity, and the outer cavity surface of the airbag is tightly attached to the smooth surface where the rubber receiving bottom plate and the rubber fixing plate contact, the rubber receiving bottom plate has an air inlet hole, the air inlet hole is connected to an external pressurized air source, the upper plane and the lower plane of the rubber fixing plate both have through holes, and the lower plane of the rubber fixing plate has a plurality of grooves, the pressurized air source passes through the air inlet hole of the rubber receiving bottom plate, passes through the through holes on the upper plane and the lower plane of the rubber fixing plate, and then acts on the inner cavity surface of the airbag through the grooves on the lower plane of the rubber fixing plate.

[0003] Since the airbag is made of rubber material, it will become soft and droop when used. The position and height of the airbag's drooping are uncertain, which causes the airbag to contact the laminating material too early when the circuit is pressed, making it impossible to completely evacuate the gas in the pressing cavity during vacuum pressing. Therefore, before pressing, the rubber base plate is often equipped with an air inlet to connect to a negative pressure source. The airbag can indeed be attached to the rubber fixing plate through a negative pressure source, but since the lower plane of the rubber fixing plate has multiple crisscross grooves, the lower plane of the rubber fixing plate forms multiple blank areas, causing the airbag to form bulges in the blank areas, such as Figure 1 As shown in the figure, the bulging of the airbag will cause uneven pressure distribution on the circuit board during the subsequent pressing process, thus affecting the pressing effect and quality of the product. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a process for eliminating airbag bulging of an FPC press machine, so that the pressure of the FPC press machine is more uniform and the quality of the finished product is greatly improved.

[0005] The technical solution adopted by the present invention is: the present invention is a process for eliminating airbag bulging of an FPC press machine, and the process is applied to an FPC press machine, wherein the FPC press machine comprises an upper pressing mechanism and a lower pressing machine, and an airbag pressing structure is arranged on the upper pressing mechanism, and the airbag pressing structure comprises an airbag mounting plate and an airbag, and the edge of the airbag is sealed and fixedly mounted on the airbag mounting plate so that the airbag wraps the bottom of the airbag mounting plate, and an upper air hole is arranged on the top of the airbag mounting plate, and a plurality of lower air holes are arranged on the bottom of the airbag mounting plate, and an airflow channel is arranged in the airbag mounting plate, and a plurality of the lower air holes are connected to the upper air hole through the airflow channel, and the process for eliminating airbag bulging of an FPC press machine is: the lower surface of the airbag mounting plate is roughened so that a plurality of the lower air holes are arranged on the rough surface.

[0006] Furthermore, the lower surface of the airbag mounting plate is roughened by sandblasting or wire drawing.

[0007] Furthermore, in the sandblasting process, dry and angular yellow sand or quartz sand with a diameter of 1 to 2 mm is selected, and compressed air is used to spray the sand particles at high speed from the sandblasting gun nozzle to the lower surface of the airbag mounting plate. The impact and friction of the sand particles are used to remove dirt on the lower surface of the airbag mounting plate, and at the same time, a surface with a certain roughness is obtained.

[0008] Furthermore, in the sandblasting process, a pressure of 4-8kg / cm² is used for the sandblasting operation.

[0009] Furthermore, the average arithmetic deviation Ra value of the profile of the lower surface of the airbag mounting plate is greater than 6.3 μm.

[0010] Furthermore, a side air hole communicating with the air flow channel is provided on the side surface of the airbag mounting plate.

[0011] Furthermore, an annular groove is provided on the upper surface of the airbag mounting plate, and the edge of the airbag is buckled in the annular groove.

[0012] Furthermore, a boss is provided on the airbag mounting plate, and the airbag pressing structure c also includes a pressing frame, the airbag is fitted and covered on the surface of the boss, and the pressing frame presses and fixes the four sides of the airbag to the lower surface of the airbag mounting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the airbag bulging of the existing FPC pressing machine; Figure 2 It is a structural diagram of the FPC pressing machine; Figure 3 is a schematic structural diagram of an airbag mounting plate of Embodiment 1; Figure 4 is a cross-sectional view of the airbag pressing structure of the first embodiment; Figure 5 is a structural schematic diagram of the airbag mounting plate of the first embodiment from another perspective; Figure 6 is a schematic diagram of the airbag pressing structure of the second embodiment; Figure 7 is an exploded view of the airbag pressing structure of the second embodiment; Figure 8 is a partial schematic diagram of the lower surface of the airbag mounting plate of the third embodiment after wire drawing; Fig. 9 It is a schematic diagram of the FPC pressing machine airbag after the process improvement of the present invention. DETAILED DESCRIPTION Embodiment 1

[0014] like Figures 2 to 5 As shown, in this embodiment, the process of eliminating airbag bulging of an FPC press machine of the present invention is applied to an FPC press machine, and the FPC press machine includes an upper pressing mechanism a and a lower pressing mechanism b, and the upper pressing mechanism a is provided with an airbag pressing structure c, and the airbag pressing structure c includes an airbag mounting plate 1 and an airbag 2, and the edge of the airbag 2 is sealed and fixedly installed on the airbag mounting plate 1, so that the airbag 2 wraps the bottom of the airbag mounting plate 1, and an upper air hole 3 is provided on the top of the airbag mounting plate 1, and a plurality of lower air holes 4 are provided on the bottom of the airbag mounting plate 1, and an airflow channel 5 is provided in the airbag mounting plate 1, and the plurality of lower air holes 4 are connected with the upper air hole 3 through the airflow channel 5. The process of eliminating airbag bulging of an FPC press machine is: the lower surface of the airbag mounting plate 1 is roughened, so that the plurality of lower air holes 4 are all arranged on the rough surface.

[0015] In this embodiment, the lower surface of the airbag mounting plate 1 is roughened by sandblasting.

[0016] In this embodiment, dry and angular yellow sand or quartz sand with a diameter of 1 to 2 mm is selected in the sandblasting process, and the sand is sprayed from the sandblasting gun nozzle at a high speed to the lower surface of the airbag mounting plate 1 by compressed air, and the dirt on the lower surface of the airbag mounting plate 1 is removed by the impact and friction of the sand, and a surface with a certain roughness is obtained. In this embodiment, the average arithmetic deviation Ra value of the profile of the lower surface of the airbag mounting plate 1 is greater than 6.3 μm.

[0017] In this embodiment, a pressure of 4-8 kg / cm² is selected for the sand blasting operation in the sand blasting process.

[0018] In this embodiment, the side of the airbag mounting plate 1 is provided with a side air hole 6 connected to the airflow channel 5. The design of the side air hole 6 can speed up the exhaust or inflation speed, thereby speeding up the expansion or contraction speed of the airbag 2.

[0019] In this embodiment, an annular groove 7 is provided on the upper surface of the airbag mounting plate 1, and the edge of the airbag 2 is buckled into the annular groove 7. Four screw holes 10 are also provided on the upper surface of the airbag mounting plate 1. When in use, the upper surface of the airbag mounting plate 1 is connected to the upper pressing mechanism a through the screw holes 10, and the upper pressing mechanism a presses the edge of the airbag 2 tightly into the annular groove 7, thereby ensuring the airtightness between the airbag 2 and the airbag mounting plate 1. Embodiment 2

[0020] like Figure 6 and Figure 7 As shown, the difference between this embodiment and the first embodiment is that: the annular groove 7 is not provided on the airbag mounting plate 1, and a boss 8 is provided on the airbag mounting plate 1. The airbag pressing structure c also includes a pressing frame 9. The airbag 2 is fitted and covered on the surface of the boss 8. The pressing frame 9 presses the four sides of the airbag 2 tightly to the lower surface of the airbag mounting plate 1. During pressing, the upper air hole 3 is connected to the external air source, and the high-pressure gas enters between the airbag 2 and the boss 8 through the gas channel. Then, the airbag 2 bulges outward and presses on the FPC board under the action of the high-pressure gas. Since the airbag 2 can fit well on the surface of the FPC board, and the pressing force is evenly released by the action of the high-pressure gas. In addition, the design of the pressing frame 9 can facilitate later maintenance and replacement. Embodiment 3

[0021] The difference between this embodiment and the first and second embodiments is that: in this embodiment, the lower surface of the airbag mounting plate 1 is roughened by a wire drawing process, such as Figure 8 As shown. The wire drawing process usually makes the lower metal surface of the airbag mounting plate 1 rougher. During the wire drawing process, the airbag mounting plate 1 is subjected to friction and cutting by mechanical forces, which will cause a certain shape and size roughness on the surface. In addition, the heat generated during the wire drawing process will increase the surface hardness of the material and the surface grains will become finer. These factors together lead to an increase in surface roughness. Wire drawing will make the surface rougher. By adjusting the wire drawing process parameters, such as line speed, wire drawing head shape, cutting depth, etc., using high-quality wire drawing dies and adopting appropriate lubricants and cooling measures, the surface roughness can be controlled to a certain extent. Through the wire drawing process, the difficulty of roughening the lower surface of the airbag mounting plate 1 can be reduced, and the consistency of the roughening treatment of the lower surface of the airbag mounting plate 1 can be improved.

[0022] In Example 1, Example 2, and Example 3, the present invention replaces the design of multiple crisscross air guide grooves by adopting a surface roughening process. When the lower surface of the airbag mounting plate 1 is rough, its uneven microstructure will increase the gap between the contact surface with the airbag 2. These tiny bumps and depressions provide more channels and gaps for gas molecules. When gases move on the rough surface, they can diffuse and penetrate more easily through these channels and gaps. This microstructural characteristic makes the rough surface have higher gas conductivity than the smooth surface, thereby eliminating the phenomenon of airbag bulging in the FPC laminating machine, such as Fig. 9 As shown, the pressure of the FPC pressing machine is more uniform, which greatly improves the quality of the finished product.

[0023] Although the embodiments of the present invention are described with practical solutions, they do not constitute limitations on the meaning of the present invention. For those skilled in the art, it is obvious to modify the implementation scheme and combine it with other solutions based on this description.

Claims

1. A process for eliminating airbag bulging of an FPC press machine, the process being applied to an FPC press machine, the FPC press machine comprising an upper pressing mechanism (a) and a lower pressing mechanism (b), the upper pressing mechanism (a) being provided with an airbag pressing structure (c), the airbag pressing structure (c) comprising an airbag mounting plate (1) and an airbag (2), the edge of the airbag (2) being sealed and fixedly mounted on the airbag mounting plate (1) so that the airbag (2) wraps around the bottom of the airbag mounting plate (1), the top of the airbag mounting plate (1) being provided with an upper air hole (3), the bottom of the airbag mounting plate (1) being provided with a plurality of lower air holes (4), the airbag mounting plate (1) being provided with an airflow channel (5), the plurality of lower air holes (4) being connected to the upper air hole (3) through the airflow channel (5), characterized in that: The process for eliminating airbag bulging of an FPC pressing machine comprises: roughening the lower surface of the airbag mounting plate (1) so that a plurality of lower air holes (4) are all arranged on the rough surface.

2. A process for eliminating airbag bulging of an FPC press machine according to claim 1, characterized in that: The lower surface of the airbag mounting plate (1) is roughened by a sandblasting process or a wire drawing process.

3. A process for eliminating airbag bulging of an FPC press machine according to claim 2, characterized in that: In the sandblasting process, dry and angular yellow sand or quartz sand with a diameter of 1 to 2 mm is selected, and the sand particles are sprayed at high speed from the sandblasting gun nozzle to the lower surface of the airbag mounting plate (1) using compressed air. The impact and friction of the sand particles are used to remove dirt on the lower surface of the airbag mounting plate (1), and at the same time, a surface with a certain roughness is obtained.

4. A process for eliminating airbag bulging of an FPC press machine according to claim 3, characterized in that: In the sandblasting process, a pressure of 4-8kg / cm² is used for sandblasting operation.

5. The process for eliminating airbag bulging of FPC pressing machine according to claim 3, characterized in that: The average arithmetic deviation Ra value of the profile of the lower surface of the airbag mounting plate (1) is greater than 6.3 μm.

6. The process for eliminating airbag bulging of an FPC press machine according to claim 1, characterized in that: The side surface of the airbag mounting plate (1) is provided with a side air hole (6) which is in communication with the airflow channel (5).

7. The process for eliminating airbag bulging of an FPC press machine according to claim 1, characterized in that: An annular groove (7) is provided on the upper surface of the airbag mounting plate (1), and the edge of the airbag (2) is buckled into the annular groove (7).

8. The process for eliminating airbag bulging of an FPC press machine according to claim 1, characterized in that: The airbag mounting plate (1) is provided with a boss (8), and the airbag pressing structure (c) further comprises a pressing frame (9). The airbag (2) is fitted and covered on the surface of the boss (8), and the pressing frame (9) presses the four sides of the airbag (2) tightly and fixes them on the lower surface of the airbag mounting plate (1).

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