A clamping system for nanosecond laser welding of metal foils and thin-film plastics

Abstract

The invention discloses a clamping system for nanosecond laser welding of metal foil and film-like plastic, and relates to the field of laser welding. It comprises two supporting bases, on which clamping assemblies are respectively provided, and further comprises a quartz glass pad and a high-transmittance quartz glass sheet. The quartz glass pad, the metal foil, the film-like plastic, and the high-transmittance quartz glass sheet are fixed together by two clamping assemblies. The invention has a simple structure and a reasonable design. By arranging a quartz glass pad and a high-transmittance quartz glass sheet, the invention not only ensures the fixation between the metal foil and the film-like plastic, but also makes the metal foil and the film-like plastic completely spread and in close contact. The clamping force is controlled by the clamping bolts and pressure sensors on both sides, which is convenient for adjusting the welding effect. The integration of the base and the clamping device enables the entire fixture to be stably installed and easy to operate, improves the stability during the welding process, ensures the accuracy of welding, improves the quality of welding, and has good practicality.

Description

Technical Field

[0001] The present invention relates to a clamping system for nanosecond laser welding of metal foils and thin-film plastics, and relates to the field of laser welding. Background Art

[0002] Nanosecond welding adopts the latest welding process concept. Using a scanning welding method, the laser energy can be distributed arbitrarily, with the characteristics that the pulse width and frequency are independently adjustable. After melting the material, a specific molten pool is formed to achieve the purpose of welding, and it has extremely high cost performance. It is especially suitable for welding between thin sheets of dissimilar non-ferrous metals; it is widely applicable to the welding of dissimilar non-ferrous metal thin sheets. The principle of laser pulse scanning welding is applied. The laser energy is evenly distributed along the specified trajectory, avoiding the defect that the long-pulse energy is Gaussian-distributed, and it is not easy to penetrate during thin-sheet welding. The solder joints are composed of multiple nanosecond pulses with high peak values, which improves the absorption rate on the surface of non-ferrous metals. Therefore, non-ferrous metals such as copper and aluminum and some thermoplastic polymers can be welded stably.

[0003] Currently, most metal foils and thin-film plastics are used in PCB boards (printed circuit boards) and 5G radio frequency antenna substrates. However, the connection method between the two mainly uses adhesive bonding or magnetron sputtering. The adhesive bonding connection method is likely to cause the adhesive to fail during high-temperature operation. This causes the metal foil and the thin-film plastic substrate to separate, affecting the use. For the method of magnetron sputtering, metal ions are magnetron-sputtered onto the surface of the thin-film plastic to connect the two. However, currently, the connection strength is difficult to control, and industrial waste liquid will also be generated, with a relatively high cost. Therefore, currently, it is necessary to tightly connect the two by means of nanosecond laser welding.

[0004] For example, the Chinese patent (application number 2012102120757) of "A thin-sheet laser welding workbench" solves the problem that thin sheets are prone to deformation during long-distance welding positioning and the welding process. However, for ultra-thin weldments such as metal foils and thin-film plastics, it is impossible to accurately make the two materials contact precisely with each other, and at the same time, it is also impossible to control the clamping force when the two come into contact. This makes it impossible to accurately control the quality of the welding joint between the metal foil and the thin-film plastic during the welding process, causing great trouble during the later adjustment of process parameters.

[0005] Due to the limitation of the ultra-thin properties of metal foils and thin-film plastics themselves, it is very difficult to fix the two on the laser welding test bench, resulting in difficulties during welding. Currently, there are few fixtures that can fix the two and perform nanosecond laser welding. When a nanosecond laser welding machine is working, it directly uses the laser beam emitted from the laser head for welding. During the welding process, it is not easy to install and fix the metal foil and the thin-film plastic, and they are prone to shaking during the welding process, making the welding of the two extremely difficult. Summary of the Invention

[0006] The present invention aims at solving the technical problems mentioned in the above background technology and adopts the following technical solutions to achieve the above problems:

[0007] A clamping system for nanosecond laser welding of metal foil and film-like plastic comprises two supporting bases, each of which is provided with a clamping assembly, and further comprises a quartz glass pad and a high-transmittance quartz glass sheet. The quartz glass pad, metal foil, film-like plastic and high-transmittance quartz glass sheet are fixed together by the two clamping assemblies, and the quartz glass pad, film-like plastic, metal foil and high-transmittance quartz glass sheet are arranged in sequence from bottom to top, and a pressure sensor is also provided on the quartz glass pad, and the sensing end of the pressure sensor corresponds to the film-like plastic, and a pressure display is electrically connected to the side wall of the pressure sensor.

[0008] It should be noted that the pressure sensor placed on the quartz glass pad (the best installation position of the pressure sensor is in the middle of the quartz glass pad) can effectively display the pressure between the metal foil and the thin film plastic, thereby ensuring the accuracy of welding and facilitating the subsequent adjustment of welding parameters.

[0009] As a preferred example, each of the clamping assemblies includes a support base, a locking bolt, and a clamping block, and the locking bolt is threadedly sleeved on the support base, the clamping block is installed on the end of the locking bolt located inside the support base, and the clamping block is located above the high-transmittance quartz glass sheet.

[0010] It should be noted that the support base can not only support the quartz glass pad, but also cooperate with the clamping block to clamp the entire laser welding "sandwich" structure.

[0011] As a preferred example, when the locking bolts on the two clamping assemblies are rotated, the clamping blocks are rotated toward the bottom of the support base until the high-transmittance quartz glass sheet is pressed.

[0012] It should be noted that the locking bolt includes a screw and a nut, the screw is threadedly sleeved on the support base, the nut is threadedly sleeved on the screw, and the bottom of the nut is in contact with the top of the support base, and the bottom of the screw is fixed with a clamping block.

[0013] As a preferred example, the two clamping assemblies are respectively mounted on external nanosecond lasers, and the laser emitting end of the laser is located directly above the high-transmittance quartz glass sheet clamped by the two clamping blocks.

[0014] As a preferred example, the length, width and height of the quartz glass spacer are 100 mm, 100 mm and 3 mm respectively, and the length, width and height of the high-transmittance quartz glass are also 100 mm, 100 mm and 3 mm respectively.

[0015] The beneficial effects of the present invention are as follows: The structure of the present invention is simple and reasonably designed. By providing a quartz glass spacer and a high-transmission quartz glass sheet, the fixation between the copper metal foil and the thin-film plastic is ensured during use, and at the same time, the metal foil and the thin-film plastic can be fully spread and closely contacted. The clamping force is controlled by the clamping bolts and pressure sensors on both sides, which is convenient for adjusting the welding effect. The integration of the base and the clamping device enables the stable installation of the entire fixture, convenient operation, improves the stability during the welding process, ensures the welding precision, improves the welding quality, and has good practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural view of the present invention;

[0017] Figure 2 is a front view of the present invention;

[0018] Figure 3 is Figure 2 a schematic structural view in the A-A direction of

[0019] In the figure: locking bolt 1, support base 2, high-transmission quartz glass sheet 3, quartz glass backing plate 4, pressure display 5, pressure sensor 6, clamping block 7. DETAILED DESCRIPTION OF THE INVENTION

[0020] In order to facilitate the understanding of the technical means, creative features, achieved purposes and effects of the present invention, the present invention will be further described below with reference to specific drawings.

[0021] The method of welding a metal foil and a thin-film plastic is as follows: Turn on the nanosecond laser, use the guiding laser to determine the overlapping welding area, set the welding speed to 150 mm / s, the jump speed to 1800 mm / s, the laser power to 90%, and the laser frequency to 20 (KHz). Start the nanosecond laser welding of the overlapping metal foil and thin-film plastic.

[0022] Example 1

[0023] As Figures 1-3 shown, a clamping system for nanosecond laser welding of copper foil and polyetheretherketone film includes two support bases 2. Clamping components are respectively provided on the copper foils on the two support bases 2. It also includes a quartz glass backing plate 4 and a high-transmission quartz glass sheet 3. The quartz glass backing plate 4, the polyetheretherketone film, and the high-transmission quartz glass sheet 3 are jointly fixed by the two clamping components, and the quartz glass backing plate 4, the polyetheretherketone film, the copper foil, and the high-transmission quartz glass sheet 3 are arranged in sequence from bottom to top. A pressure sensor 6 is also provided on the quartz glass backing plate 4, and the sensing end of the pressure sensor 6 corresponds to the polyetheretherketone film. A pressure display 5 is electrically connected to the side wall of the pressure sensor 6.

[0024] Each clamping assembly includes a support base 2, a locking bolt 1, and a clamping block 7. The locking bolt 1 is threadedly sleeved on the support base 2, and the clamping block 7 is installed at the end of the locking bolt 1 inside the support base 2, and the clamping block 7 is located above the high-transmittance quartz glass sheet 3.

[0025] When the locking bolts 1 on the two clamping assemblies are rotated, at this time the clamping blocks 7 rotate downward towards the support base 2 until the high-transmittance quartz glass sheet 3 is pressed tightly.

[0026] The two clamping assemblies are respectively installed on an external nanosecond laser, and the laser emission end of the laser is located directly above the high-transmittance quartz glass sheet 3 clamped by the two clamping blocks 7.

[0027] The length, width, and height of the quartz glass spacer are 100 mm, 100 mm, and 3 mm respectively, and the length, width, and height of the high-transmittance quartz glass are also 100 mm, 100 mm, and 3 mm respectively.

[0028] It should be noted that the length, width, and height of the copper foil are 80 mm * 30 mm * 0.02 mm; the length, width, and height of the polyetheretherketone film are 80 mm * 30 mm * 1 mm; the length, width, and height of the entire device are 107 mm * 62 mm * 35 mm.

[0029] Working principle: Unfold the copper foil and the polyetheretherketone film and place them on the quartz glass spacer 4, and place the copper foil on the polyetheretherketone film. In this way, during welding, the heat can be quickly transferred to the plastic film by using the high heat transfer property of the metal foil, and then covered with the high-transmittance quartz glass sheet 3. At this time, adjust the locking bolts 1 on both sides to fix it, which is convenient for the welded parts to spread and be in close contact;

[0030] Through the locking bolt 1, the clamping force between the polyetheretherketone film and the copper foil is determined by the pressure sensor 6 and the pressure indicator 5. Such a stable installation is convenient to operate, improves the stability during the welding process, ensures the welding precision, improves the welding quality, and has good practicability;

[0031] At this time, turn on the nanosecond laser to perform butt joint nanosecond laser welding on the copper foil and the polyetheretherketone film. After welding, adjust the locking bolt 1, remove the high-transmittance quartz glass sheet 3, and take out the successfully welded parts.

[0032] Example 2

[0033] It is exactly the same as Example 1 as a whole, and the only difference is that the plastic film used is a PA66 film.

[0034] It should be noted that in addition to Examples 1 and 2, it can also be applied to the welding between other metal foils and plastic films.

[0035] Since only the materials are different between Embodiment 1 and Embodiment 2, but the working principle of the whole device is the same, the working principle will not be introduced in detail.

[0036] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and various changes and improvements can be made without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A clamping system for nanosecond laser welding of metal foil and thin-film plastics, comprising two support bases, and clamping assemblies are respectively arranged on the two support bases, and it is characterized in that, It also includes a fused silica backing plate and a high-transmission fused silica sheet. The fused silica backing plate, metal foil, thin-film plastic, and high-transmission fused silica sheet are jointly fixed by two clamping assemblies. The fused silica backing plate, thin-film plastic, metal foil, and high-transmission fused silica sheet are arranged in sequence from bottom to top. A pressure sensor is also provided on the fused silica backing plate, and the sensing end of the pressure sensor corresponds to the thin-film plastic. A pressure display is electrically connected to the side wall of the pressure sensor; Each clamping assembly includes a support base, a locking bolt, and a clamping block. The locking bolt is threadedly sleeved on the support base, and the clamping block is installed at the end of the locking bolt located inside the support base. The clamping block is located above the high-transmission fused silica sheet. The support base can not only support the fused silica pad but also cooperate with the clamping block to clamp the entire laser-welded "sandwich" structure; The method of welding the metal foil and the thin-film plastic is as follows: Unfold the copper foil and the polyether ether ketone film and place them on the fused silica pad. Place the copper foil on the polyether ether ketone film to quickly transfer the heat to the thin-film plastic by using the high heat transfer property of the metal foil. Then cover it with a high-transmission fused silica sheet. At this time, turn on the nanosecond laser and perform butt-joint nanosecond laser welding on the copper foil and the polyether ether ketone film; The pressure sensor on the fused silica backing plate is located at the middle position of the fused silica backing plate.

2. The clamping system for nanosecond laser welding of metal foils and thin-film plastics according to claim 1, characterized in that: When the locking bolts on the two clamping assemblies are rotated, the clamping blocks rotate downward towards the support base until the high-transmission fused silica sheet is pressed tightly.

3. A clamping system for nanosecond laser welding of metal foils and thin-film plastics according to claim 1, characterized in that: The two clamping assemblies are respectively installed on the external nanosecond laser, and the laser emission end of the laser is located directly above the high-transmission fused silica sheet clamped by the two clamping blocks.

4. A clamping system for nanosecond laser welding of metal foils and thin-film plastics according to claim 1, characterized in that: The length, width, and height of the fused silica pad are 100 mm, 100 mm, and 3 mm respectively, and the length, width, and height of the high-transmission fused silica are also 100 mm, 100 mm, and 3 mm respectively.

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