Design and assembly method of adjustable clamp for laser processing of ultrathin carbon / carbon composite material

Abstract

The invention belongs to the field of laser processing, and relates to a design and assembly method for an adjustable clamp used for laser processing of an ultrathin carbon / carbon composite material screen structure, in particular to a design and assembly method for an adjustable clamp used for laser processing of an ultrathin carbon / carbon composite material screen structure. The design of the adjustable clamp adopts a modularized, normalized and serialized design method. Modules in the modular design of the adjustable clamp are composed of a bottom frame module, a pressing plate module, a sliding guide rail module and an adjusting module, and all the modules are connected through installation bolts. The assembling method of the adjustable clamp comprises the steps of assembling the underframe module, assembling the pressing plate module and the sliding guide rail module, installing the supporting frame assembly, then installing the adjusting module, pre-adjusting the height of the cross-shaped adjusting block in the adjusting module, and finally installing a workpiece to complete clamping. The clamp is simple in overall structure and convenient to operate. The cross-shaped adjusting block has a curved surface or a plane shape, is convenient to disassemble and replace, and plays a key role in high-quality, high-efficiency and high-precision laser processing of the ultra-thin carbon / carbon composite material screen structure.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of laser processing, and relates to a design and assembly method of an adjustable clamp for laser processing of a super-thin carbon / carbon composite screen structure. BACKGROUND

[0002] An ion thruster is a power device widely used in the field of space propulsion. The grid assembly, as a key component in the ion thruster, has a super-thin structure with a high-density grid array hole. Since the carbon / carbon composite material has the advantages of high specific strength, high-temperature resistance, ablation resistance, and friction and wear resistance, the carbon / carbon composite material is used to replace the metal molybdenum as the grid material, which can effectively improve the reliability and service life of the ion engine. The super-thin carbon / carbon composite screen structure has the structural characteristics of a large machining surface domain diameter of ≥300 mm, a super-thin structure thickness of ≤0.6 mm, and a high-density array hole, which makes the traditional processing method difficult to continue. Laser drilling technology has become one of the effective methods for processing carbon / carbon composite materials due to its high precision, non-contact processing, and wide range of processable materials. The existing laser processing of super-thin materials is usually clamped by the edge of the workpiece and fixed on the workbench for processing. The workpiece is only fixed by the edge of the clamp, or clamped by a vacuum adsorption platform, and the workpiece is in direct contact with the lower adsorption platform.

[0003] However, due to the complex characteristics of the super-thin carbon / carbon composite screen structure, such as a large machining surface domain, a super-thin structure, and a high-density array of small holes, only the edge of the workpiece is clamped, the weakly rigid workpiece is easily deformed under the combined action of its own weight and the medium-high pressure cooling gas flow during processing, which leads to the deviation of the laser focal point, and further reduces the processing efficiency and precision. When using the full adhesion clamping method of negative pressure adsorption, the surface of the clamp in direct contact with the workpiece is easily vaporized under laser irradiation, and the vaporized products condense and adhere to the surface of the workpiece, which leads to the pollution of the processing surface and seriously affects the processing quality. In addition, the super-thin carbon / carbon composite screen structure is a typical non-standard part, and its demand for the clamp shows the characteristics of overall convergence and partial difference. For the super-thin carbon / carbon material grid assembly with different surface shapes of curved surface / flat surface, the conformal clamp needs to be replaced to clamp the super-thin carbon / carbon material workpiece with different surface shapes. Therefore, it is urgent to design an adjustable clamp for laser processing of super-thin carbon / carbon composite screen structures to meet the high-quality and high-efficiency processing requirements.

[0004] The existing laser processing ultra-thin material clamping technology, patent publication number CN221849051U, inventor Zhao Jie et al.'s invention patent "A fixture for laser processing" uses a slotted clamping mechanism in conjunction with a reciprocating screw to clamp the material, and directly places it on a cross base for laser processing. This clamping method causes wear on the material surface due to direct contact between the metal fixture surface and the material workpiece, thereby affecting the material properties. Patent publication number CN 113172352A, inventor Li Wei et al.'s invention patent "A laser processing method and laser processing equipment for a flexible screen" uses an optical vacuum adsorption positioning platform to clamp and process ultra-thin workpieces. This negative pressure adsorption full-fit clamping method causes the laser to react with the fixture material. The substance produced after the reaction will adhere to the ultra-thin material, affecting the laser processing quality. Summary of the Invention

[0005] In order to overcome the problems of existing fixtures that easily cause workpiece deformation, reactant adhesion, and conformal clamping of ultra-thin carbon / carbon material gate components with different surface shapes during processing, the present invention invents a design and assembly method of a special adjustable fixture for laser hole precision processing of ultra-thin carbon / carbon composite material screen structures, thereby achieving high-quality and efficient processing requirements of ultra-thin carbon / carbon composite material screen structures.

[0006] The adjustable fixture is designed using a modular, standardized, and serialized approach. The modular design consists of a base frame module, a pressure plate module, a sliding guide module, and an adjustment module. Each module is connected by mounting bolts, resulting in a simple and practical structure. The hollow areas between the base frame and pressure plate modules correspond to the hollow areas, creating a "田"-shaped frame structure. A cross adjustment block is installed in this hollow area, allowing the laser to pass through and fully supporting, positioning, and locking the workpiece. The height of the cross adjustment block can be adjusted in two ways, with either a straight or curved surface to accommodate varying workpiece heights and shapes. Adjustment is convenient and reliable.

[0007] The technical solution adopted by the present invention is a design and assembly method for an adjustable fixture for laser processing ultra-thin carbon / carbon composite materials, which is characterized in that the adjustable fixture design adopts modular, standardized, and serialized design methods; the modules in the modular design of the adjustable fixture are composed of a base frame module, a pressure plate module, a sliding guide module, and an adjustment module, and the modules are connected by mounting bolts; standardization refers to the size specifications of the main parts in each module adopting rectangular or square shapes; serialization refers to the size of the main parts adopting rectangular or square sizes being in a series, which is selected during design, and the main parts have different heights, specifications, sizes, and series to meet the size requirements of various processed parts;

[0008] The various modules of the design are assembled in sequence into a whole adjustable clamp by assembling; the specific assembly method of the adjustable clamp is as follows:

[0009] Step one, assemble the adjustable clamp chassis module;

[0010] First, assemble the chassis module, which is composed of a chassis 4, a stand 5, and a connecting head 6. The chassis 4 is a rectangular or square frame structure, and the upper surface of the chassis 4 is a smooth plane. The middle position of the chassis 4 is a hollow processing area. The chassis 4 is supported by four stands 5, and the end of each stand 5 is connected to a connecting slot of a connecting head 6. A fixing bolt is inserted through the connecting slot to fix the chassis 4 on the workbench.

[0011] Step two, assemble the pressure plate module

[0012] The pressure plate module is composed of a pressure plate 1, a first gasket 2, a second gasket 3, and a plurality of mounting bolts 11. The pressure plate 1, the first gasket 2, and the second gasket 3 are all hollow structures, and the size specifications are all rectangular or square. The first gasket 2 and the second gasket 3 are made of rubber material and have different height series. The appropriate one is selected according to the workpiece processing requirements. The parts in the pressure plate module are connected together from the pressure plate downward through the mounting bolts 11.

[0013] Step three, assemble the sliding guide rail module;

[0014] The sliding guide rail module is composed of a guide rail 8 and a sliding block 9. The guide rail 8 is composed of a guide rail body 8a, a mountain-shaped guide rail 8b, and a guide rail body mounting screw 8c. The sliding block 9 is composed of a sliding block body 9a, a sliding block V-shaped groove 9b, and a sliding block fixing screw 9c. First, the guide rail body mounting screw 8c is inserted through the through hole of the guide rail body 8a to fix the four guide rail bodies 8a in the middle of the four edge frames of the chassis 4. The bottoms of the four guide rail bodies 8a are fixed to the four ends of the cross-shaped support plate 7, respectively. Then, the four sliding block bodies 9a of the sliding block are installed on the four end parts of the cross-shaped adjusting block 10 through the sliding block fixing screw 9c.

[0015] Step four, install the adjusting module to adjust the sliding guide rail assembly;

[0016] The adjusting module is composed of a cross-shaped adjusting block 10 and a support plate assembly. The cross-shaped adjusting block 10 is made of high-strength glass fiber material and has a threaded hole 10a in the center. The size specification of the cross-shaped adjusting block 10 is a rectangular or square block. The upper surface of the cross-shaped adjusting block 10 has two shapes: a straight surface and a curved surface. The appropriate one is selected according to the shape of the workpiece to meet the requirements of different workpiece shapes. The support plate assembly is composed of a cross-shaped support plate 7 and an adjusting screw 7a. The size specification of the cross-shaped support plate 7 is a rectangular or square plate. The adjusting screw 7a is installed in the center hole of the cross-shaped support plate 7 during the assembly of the support plate assembly.

[0017] Align the central threaded hole 10a of the cross adjustment block 10 on which the slider body 9a in the sliding guide rail module is installed with the adjusting bolt 7a installed at the center of the cross support plate 7, and screw the adjusting bolt 7a into the central threaded hole 10a of the cross adjustment block 10; rotate the cross adjustment block 10 so that the slider body 9a in the guide rail module installed at its end is aligned with the gable guide rail 8b, and enter the gable guide rail 8b from top to bottom, and the slider body 9a and the gable guide rail 8b are matched with each other using a clearance fit;

[0018] Step 5: Pre-adjust the height of the cross adjustment block in the adjustment module to meet the requirements of different workpiece processing heights.

[0019] Adjustment 1: Using the guide rail module to limit the other degrees of freedom of the cross adjustment block 10 so that it can move up and down to adapt to gaskets of different thicknesses;

[0020] Adjustment 2: Use the cross-shaped support plate 7 fixed to the bottom of the track and rotate the adjusting bolt 7a on the support plate 7 to fine-tune the upper and lower positions of the cross adjustment block 10 to be consistent with the installation height of the workpiece;

[0021] Step 6: Install the workpiece to complete the clamping

[0022] Install the workpiece between the first gasket 2 and the second gasket 3 of the pressure plate module, close to the through hole 11 a Position, by installing bolts 11, the pressure plate module and the base frame 4 are fixed together, and the workpiece is positioned; the position corresponding to the hollow area of ​​the base frame module and the pressure plate module is the hollow area, and the hollowing is a "田"-shaped frame structure. The cross adjustment block 10 installed in the hollow area allows the laser to pass through and can support, position and lock the workpiece; use the adjustment bolt 7a to fine-tune the height of the cross adjustment block 10 to keep it at the same level as the workpiece and close to the surface of the workpiece;

[0023] Check the tightness between the workpiece and the second gasket 3 to avoid deformation caused by the downward purge of the protective gas and the stress concentration caused by its own weight, thereby improving the quality of laser hole making.

[0024] After the adjustable fixture is assembled and adjusted, the ultra-thin carbon / carbon composite material workpiece is laser-drilled to give it a screen structure.

[0025] The beneficial effects of the present invention are as follows: the adjustable fixture is designed in a modular, standardized, and serialized manner, with standardized design and a wide range of applications. It can meet the requirements for laser processing of ultra-thin carbon / carbon composite materials with high efficiency and high quality. The ultra-thin workpiece is placed on a hollow "田"-shaped frame in the middle of the adjustable fixture. The workpiece and the cross adjustment block must fit tightly together to form an effective support for the ultra-thin workpiece, solving the technical problems of bending and deformation of the ultra-thin carbon / carbon workpiece due to the force generated during the downward sweep of the protective gas, causing the laser focus to shift and affecting the processing efficiency. The two gaskets are rubber gaskets, so that the ultra-thin material is buffered by the rubber material during the clamping process, avoiding direct contact with the pressure plate and the base frame to damage the workpiece surface.

[0026] The cross adjustment block is made of high-strength fiberglass, a material that boasts high surface finish, low laser absorption, non-flammability, and excellent chemical resistance. Its internal crystal structure refracts the laser beam, significantly attenuating the laser energy during penetration and significantly weakening the interaction between the laser and the fixture material. Therefore, using this material as a cross adjustment block ensures that the adjustable fixture can achieve the desired punching effect during processing while still providing support. When processing ultra-thin carbon / carbon materials with varying curved / flat surfaces, it's difficult to efficiently replace the corresponding conformal adjustment blocks, thereby supporting and clamping ultra-thin carbon / carbon materials with flat / curved surfaces. Cross adjustment blocks with both straight and curved surfaces are available for selection, facilitating quick replacement based on the workpiece's surface shape, significantly improving production flexibility and efficiency.

[0027] The adjustable fixture features a simple overall structure and easy operation. The cross-adjustment block can be adjusted to suit the shape of the ultra-thin material being processed, allowing for fine-tuning of the height to accommodate workpieces of varying heights. It is also easily disassembled and replaced, playing a key role in the high-quality, efficient, and high-precision laser processing of ultra-carbon / carbon composite screen structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 : Flowchart of adjustable fixture design and assembly method.

[0029] Figure 2 : Adjustable fixture three-dimensional assembly drawing; Figure 3 : Top view of the three-dimensional assembly drawing of the chassis internal components; Figure 4 : Bottom-view stereoscopic assembly drawing of the chassis internal components; Figure 5 : Assembly perspective view of the pressure plate assembly; Figure 6 : The bottom-up stereogram of the cross adjustment block,

[0030] Figure 7: Comparison diagram of installing different surface shape cross adjustment blocks in the inner cavity of the base frame. Among them, a) is a diagram of installing a curved surface shape cross adjustment block, and b) is a diagram of installing a flat surface shape cross adjustment block.

[0031] Wherein, 1-pressing plate, 2-second gasket, 3-first gasket, 4-base frame, 5-stand, 6-connector, 7-cross-shaped support frame, 7a-adjusting bolt, 8a-guide rail body, 8b-trapezoidal guide rail, 8c-guide rail body mounting screw, 9-sliding guide rail module, 9a-sliding block body, 9b-sliding block V-shaped groove, 9c-sliding block fixing screw, 10-cross adjustment block, 10a-cross adjustment block center threaded hole, 11-mounting bolt, 11a-through hole. DETAILED DESCRIPTION

[0032] The specific implementation process of the present application will be described in detail below in combination with the drawings and technical solutions.

[0033] Figure 1 is the design and assembly method flowchart of the adjustable clamp of the present application.

[0034] The adjustable clamp design adopts a modular, standardized and serialized design method. The modules in the modular design are composed of a base frame module, a pressing plate module, a sliding guide rail module and an adjustment module, and the modules are connected by mounting bolts. Standardization refers to the size of the main parts in each module being rectangular or square, and in this embodiment, the size is all square. Serialization refers to the height of the main parts being different, with different size series, to adapt to the size requirements of various machining parts. For example, the heights of the first gasket 2 and the second gasket 3 in the pressing plate module adopt different sizes in the size series.

[0035] The designed modules are assembled in sequence to become an adjustable clamp as a whole by assembly, as shown in Figure 2 ; The specific assembly method of the adjustable clamp is as follows:

[0036] Step one, assemble the adjustable clamp base frame module.

[0037] First, assemble the base frame module, which is composed of a base frame 4, a stand 5 and a connector 6. The base frame 4 is a rectangular or square frame structure, and the upper surface of the base frame 4 is a smooth plane. The middle position of the base frame 4 is a hollow processing area. The base frame 4 is supported by four stands 5, and the end of each stand 5 is connected with the connecting slot of the connector 6. The fixed bolt is inserted through the connecting slot to fix the base frame 4 on the workbench, as shown in Figure 2 、 Figure 3 .

[0038] Step two, assemble the pressing plate module

[0039] The pressing plate module is composed of a pressing plate 1, a first gasket 2, a second gasket 3 and a plurality of mounting bolts 11; the pressing plate 1, the first gasket 2 and the second gasket 3 are all hollow structures, and the sizes of all the components are rectangular or square. The first gasket 2 and the second gasket 3 are both made of rubber material and have different size series, which are selected according to the requirements of workpiece processing. The components in the pressing plate module are connected together in sequence from the pressing plate through the mounting bolts 11, see Figure 5 .

[0040] Step three, assemble the sliding guide rail module;

[0041] The sliding guide rail module is composed of a guide rail 8 and a sliding block 9, and the guide rail 8 is composed of a guide rail body 8a, a mountain-shaped guide rail 8b and a guide rail body mounting screw 8c. The sliding block 9 is composed of a sliding block body 9a, a sliding block V-shaped groove 9b and a sliding block fixing screw 9c. First, the guide rail body mounting screw 8c is inserted through the through hole of the guide rail body 8a to fix the four guide rail bodies 8a in the middle of the four frame edges of the base frame 4, and the bottoms of the four guide rail bodies 8a are fixed to the four ends of the cross-shaped support plate 7, respectively. Then, the four sliding block bodies 9a of the sliding block are fixed to the four end portions of the cross-shaped adjusting block 10 through the sliding block fixing screw 9c, see Figure 3 、 Figure 4 、 Figure 6 .

[0042] Step four, install the adjusting module to deploy the sliding guide rail assembly;

[0043] The adjusting module is composed of a cross-shaped adjusting block 10 and a support plate assembly. The cross-shaped adjusting block 10 is made of high-strength glass fiber material and has a threaded hole 10a in the center. The size specification of the cross-shaped adjusting block 10 is a rectangular or square block. The upper surface of the cross-shaped adjusting block 10 has two shapes: a straight surface shape and a curved surface shape, which are selected according to the requirements of workpiece processing shape to meet the requirements of different processing workpiece shapes, see Figure 7 . The support plate assembly is composed of a cross-shaped support plate 7 and an adjusting screw 7a. The size specification of the cross-shaped support plate 7 is a rectangular or square plate. The adjusting screw 7a is installed in the center hole of the cross-shaped support plate 7 when the support plate assembly is assembled, see Figure 4 .

[0044] Align the center threaded hole 10a of the cross-shaped adjusting block 10 in which the sliding block body 9a of the sliding guide rail module is installed with the adjusting screw 7a installed in the center of the cross-shaped support plate 7, and then screw the adjusting screw 7a into the center threaded hole 10a of the cross-shaped adjusting block 10. Rotate the cross-shaped adjusting block 10 so that the sliding block body 9a of the guide rail module installed at the end of the cross-shaped adjusting block 10 is aligned with the mountain-shaped guide rail 8b and enters the mountain-shaped guide rail 8b from top to bottom. The sliding block body 9a and the mountain-shaped guide rail 8b are matched in a clearance fit manner.

[0045] Step 5: Pre-adjust the height of the cross adjustment block in the adjustment module to meet the requirements of different workpiece processing heights.

[0046] Adjustment 1: The cross adjustment block 10 is moved up and down while limiting other degrees of freedom in the guide rail module to adapt to gaskets of different thicknesses.

[0047] Adjustment 2: Use the cross-shaped support plate 7 fixedly installed at the bottom of the track and rotate the adjusting bolt 7a on the support plate 7 to fine-tune the upper and lower positions of the cross adjustment block 10 to be consistent with the installation height of the workpiece.

[0048] Step 6: Install the workpiece to complete the clamping

[0049] Install the workpiece between the first gasket 2 and the second gasket 3 of the pressure plate module, close to the through hole 11 a The workpiece is positioned by installing bolts 11 to securely connect the pressure plate module and the base frame 4. The hollow area between the base frame module and the pressure plate module is a hollowed-out area, forming a "田"-shaped frame structure. A cross adjustment block 10 installed in this hollowed-out area allows the laser to pass through and supports, positions, and locks the workpiece. Adjustment bolts 7a are used to fine-tune the height of the cross adjustment block 10 to maintain it level with the workpiece and close contact with the workpiece surface.

[0050] Check the tightness between the workpiece and the second gasket 3 to avoid deformation caused by the downward purge of the protective gas and the stress concentration caused by its own weight, thereby improving the quality of laser hole making.

[0051] After the adjustable fixture is assembled and adjusted, the ultra-thin carbon / carbon composite material workpiece is laser-drilled to give it a screen structure.

[0052] Based on an ingenious design, the present invention can effectively ensure the positioning and clamping of low-rigidity ultra-thin carbon / carbon composite material workpieces in a single installation. Relying on the manufacturing precision of the adjustable fixture, the workpiece height can be accurately adjusted by adjusting the bolts to meet the processing requirements, thereby completing high-precision laser processing of holes in the screen structure of ultra-thin carbon / carbon composite material workpieces.

Claims

1. A design and assembly method for an adjustable fixture for laser processing of ultra-thin carbon / carbon composite materials, characterized by: The adjustable fixture design adopts modularization, standardization and serialization design methods; The modules in the modular design of the adjustable fixture are composed of a base module, a pressure plate module, a sliding guide module and an adjustment module, and the modules are connected by mounting bolts; standardization means that the size specifications of the main parts in each module are rectangular or square; serialization means that the size of the main parts with rectangular or square dimensions is in a series, which is selected during design. The main parts have different heights and different specifications, sizes and series to meet the size requirements of various processed parts; Use assembly to assemble the designed modules in sequence to form an adjustable fixture as a whole; the specific assembly method of the adjustable fixture is as follows: Step 1: Assemble the adjustable fixture chassis module; First, assemble the chassis module, which consists of a chassis (4), columns (5), and connectors (6). The chassis (4) is a rectangular or square frame structure, and the upper surface of the chassis (4) is a smooth surface. The middle position of the chassis (4) is a hollow processing area. The chassis (4) is supported by four columns (5), and the end of each column (5) is connected to a connecting groove of a connector (6). The fixing bolts are passed through the connecting grooves to fix the chassis (4) on the workbench. Step 2: Assemble the pressure plate module The pressure plate module is composed of a pressure plate (1), a first gasket (2), a second gasket (3) and a plurality of mounting bolts (11); the pressure plate (1), the first gasket (2) and the second gasket (3) are all hollow structures, and the size specifications of each part are the same as a rectangle or a square. The first gasket (2) and the second gasket (3) are both made of rubber material and have different size and height series, which are selected in the series according to the workpiece processing requirements; the various parts in the pressure plate module are connected together in sequence from the pressure plate downwards by mounting bolts (11); Step 3: Assemble the sliding rail module; The sliding guide rail module is composed of a guide rail (8) and a slider (9), wherein the guide rail (8) is composed of a guide rail body (8a), a mountain-shaped guide rail (8b), and a guide rail body mounting screw (8c), and the slider (9) is composed of a slider body (9a), a slider V-shaped groove (9b), and a slider fixing screw (9c); first, the guide rail body mounting screw (8c) is passed through the through hole of the guide rail body (8a) to fix the four guide rail bodies (8a) to the middle of the four frames of the base frame (4), and the bottoms of the four guide rail bodies (8a) are respectively fixed to the four ends of the cross-shaped support plate (7); then, the four slider bodies (9a) of the slider are fixed to the four ends of the cross adjustment block (10) through the slider fixing screws (9c); Step 4: Install the adjustment module and adjust the sliding guide rail assembly; The adjustment module is composed of a cross adjustment block (10) and a support plate assembly. The cross adjustment block (10) is made of high-strength glass fiber material and has a threaded hole (10a) processed in the center. The cross adjustment block (10) has a size specification of a rectangular or square block. The upper surface of the cross adjustment block (10) has two shapes: a straight surface shape and a curved surface shape, which are selected according to the requirements of the workpiece processing shape to meet the requirements of different workpiece shapes. The support plate assembly is composed of a cross support plate (7) and an adjusting bolt (7a). The size specification of the cross support plate (7) is a rectangular or square plate. When assembling the support plate assembly, the adjusting bolt (7a) is installed in the center hole of the cross support plate (7). Adjust the sliding guide rail assembly, align the central threaded hole (10a) of the cross adjustment block (10) on which the slider body (9a) in the sliding guide rail module is installed with the adjustment bolt (7a) installed on the center of the cross support plate (7), and screw the adjustment bolt (7a) into the central threaded hole (10a) of the cross adjustment block (10); rotate the cross adjustment block (10) so that the slider body (9a) in the guide rail module installed at its end is aligned with the mountain-shaped guide rail (8b), and enter the mountain-shaped guide rail (8b) from top to bottom, and the slider body (9a) and the mountain-shaped guide rail (8b) are matched in a clearance fit manner; Step 5: Pre-adjust the height of the cross adjustment block in the adjustment module to meet the requirements of different workpiece processing heights. Adjustment 1. Using the guide rail module to limit the other degrees of freedom of the cross adjustment block (10) to make it move up and down, so as to adapt to gaskets of different thicknesses; Adjustment 2: Using the cross-shaped support plate (7) fixedly mounted on the bottom of the track and the adjusting bolt (7a) on the rotating support plate (7), the upper and lower positions of the cross adjustment block (10) can be fine-tuned to be consistent with the installation height of the workpiece; Step 6: Install the workpiece to complete the clamping Install the workpiece between the first spacer (2) and the second spacer (3) of the platen module, near the position of the through hole (11 a ). Connect the platen module and the chassis (4) by the mounting bolts (11) to position the workpiece. The position corresponding to the hollow area of the chassis module and the platen module is a hollowed-out area, and the hollowed-out area is in the frame structure of a "field" shape. The cross adjustment block (10) installed in the hollowed-out area allows the laser to pass through and can support and position the workpiece. Use the adjustment bolt (7a) to finely adjust the height of the cross adjustment block (10) to keep it at the same horizontal level as the workpiece and close to the surface of the workpiece. Checking the tightness between the workpiece and the second gasket (3) to avoid deformation caused by the downward purge process of the protective gas and the stress concentration caused by the deadweight, thereby improving the quality of the laser hole making process; After the adjustable fixture is assembled and adjusted, the ultra-thin carbon / carbon composite material workpiece is laser-drilled to give it a screen structure.

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