A laser cutting fixture for PCBN compact

Abstract

The utility model discloses a kind of PCBN composite sheet laser cutting clamps, including clamping body, at least two clamping holes are set in clamping body front, adjustable clamping module is equipped in each clamping hole, the positioning hole that is perpendicular to clamping hole is equipped in clamping body bottom surface, positioning top rod with pressure detection is installed in positioning hole, heat dissipation channel parallel with clamping hole is set in clamping body inside, heat dissipation channel is filled with heat-conducting material, the detachable mounting protrusion is equipped in clamping body side surface.The utility model is compatible with multiple shapes workpiece by "adjustable clamping module", solve the single problem of original fixture adaptability;"positioning top rod with pressure detection" realizes the quantitative control of positioning force, reduces manual error;"heat dissipation channel+heat-conducting material" quickly exports cutting heat, reduces workpiece thermal damage and fixture deformation;"detachable mounting protrusion" adapts different models laser cutting machine, improves installation versatility, fundamentally solves the core defects of original fixture.

Description

Technical Field

[0001] This utility model belongs to the field of laser processing equipment technology, and specifically relates to a PCBN composite sheet laser cutting fixture, which is particularly suitable for high-precision double-sided cutting of polycrystalline cubic boron nitride composite sheets (PCBN composite sheets) and various regular / irregular shaped workpieces. Background Technology

[0002] Utility model patent CN201483159U discloses a fixture for laser cutting. It achieves positioning and double-sided cutting of PCBN composite sheets through a fixture body, clamping holes, and positioning push rods, improving cutting efficiency and cut surface quality compared to traditional single-sided cutting fixtures. However, in practical applications, this fixture still has the following drawbacks: Limited clamping adaptability: The clamping holes are fixed in a "trapezoidal + square" structure, which is only suitable for square and round workpieces. It cannot be compatible with polygonal (such as hexagonal, octagonal) and irregularly shaped workpieces (such as irregularly shaped PCBN composite sheets). Furthermore, different sizes of workpieces require different clamps, resulting in poor versatility.

[0003] Positioning accuracy depends on manual operation: the positioning top rod is manually adjusted by screws, and there is no quantitative standard for tightening force, which can easily cause the workpiece to shift due to uneven force; double-sided cutting requires manual adjustment of the fixture and drawing for alignment, which results in large human errors and affects cutting accuracy.

[0004] Lack of heat dissipation and dust prevention: There is no dedicated heat dissipation structure. The heat generated by laser cutting is easy to accumulate in the contact area between the fixture and the workpiece, which can lead to thermal damage to the workpiece or deformation of the fixture. Dust and debris generated by cutting can easily enter the positioning holes and grooves, jamming the positioning top rod and reducing the adjustment accuracy.

[0005] Low installation and operation efficiency: The side protrusion is a fixed structure, which can only be used with specific models of laser cutting machine worktables and cannot be flexibly connected to different equipment; when clamping multiple workpieces, the positioning rods need to be adjusted one by one, which is cumbersome and results in low batch processing efficiency.

[0006] Therefore, it is urgent to improve the original fixture to solve the above-mentioned problems of adaptability, accuracy, heat dissipation and operation efficiency, and meet the higher requirements of laser cutting processing. Utility Model Content

[0007] To address the shortcomings in the aforementioned background technology, this utility model proposes a PCBN composite sheet laser cutting fixture, the technical problem to be solved being: how to achieve compatible clamping of circular, square, polygonal and irregular shaped workpieces.

[0008] The technical solution of this utility model is as follows: A PCBN composite sheet laser cutting fixture includes a fixture body, at least two clamping holes on the front of the fixture body, each clamping hole having an adjustable clamping module, a positioning hole perpendicular to the clamping holes on the bottom surface of the fixture body, a positioning top rod with pressure detection installed in the positioning hole, a heat dissipation channel parallel to the clamping holes inside the fixture body, the heat dissipation channel being filled with a thermally conductive material, and a detachable mounting protrusion on the side of the fixture body.

[0009] The beneficial effects of this technical solution are as follows: the "adjustable clamping module" is compatible with workpieces of various shapes, solving the problem of limited adaptability of the original fixture; the "positioning rod with pressure detection" enables quantitative control of positioning force, reducing manual errors; the "heat dissipation channel + heat-conducting material" quickly dissipates cutting heat, reducing workpiece thermal damage and fixture deformation; and the "detachable mounting protrusion" adapts to different models of laser cutting machines, improving installation versatility and fundamentally solving the core defects of the original fixture.

[0010] Based on the above technical solutions, as a preferred technical solution for the laser cutting fixture of the PCBN composite sheet, the adjustable clamping module includes an arc-shaped clamping plate that slides along the inner wall of the clamping hole and an elastic positioning block connecting the arc-shaped clamping plate and the inner wall of the clamping hole. Further beneficial effects of this technical solution are: the arc-shaped clamping plate can adaptively slide according to the shape of the workpiece, and the elastic positioning block provides stable clamping force. It can accommodate both round and polygonal workpieces, and can also conform to the surface of irregularly shaped workpieces through elastic deformation. The clamping adaptation range is expanded to more than three times that of the original fixture, eliminating the need to replace the fixture.

[0011] Based on the above technical solution, as a preferred technical solution for the laser cutting fixture of the PCBN composite sheet, a wear-resistant pad is provided on the inner side of the arc-shaped clamping plate. The wear-resistant pad is a tungsten carbide coating with a thickness of 0.1-0.2mm. Further beneficial effects of this technical solution are: the tungsten carbide coating has a hardness of HRC65 or higher, reducing frictional wear between the workpiece and the clamping plate, increasing the service life of the inner wall of the clamping hole from 300 cuts in the original fixture to over 1000 cuts, while simultaneously preventing surface damage to the workpiece.

[0012] Based on the above technical solution, as a preferred technical solution for the laser cutting fixture of the PCBN composite sheet, the positioning top rod includes a screw, a pressure sensor located at the top of the screw, and a digital display screen located at the bottom of the screw. A further beneficial effect of this technical solution is that the pressure sensor and digital display screen quantify the positioning force (accuracy ±0.5N), avoiding workpiece offset caused by uneven manual force adjustment. The positioning error is reduced from ±0.1mm of the original fixture to ±0.02mm, while also facilitating uniform clamping force for multiple workpieces.

[0013] Based on the above technical solution, as a preferred technical solution for the laser cutting fixture of the PCBN composite sheet, the top of the screw of the positioning push rod is provided with an anti-slip pad. The anti-slip pad is made of fluororubber and has a diamond-shaped anti-slip texture on its surface. Further beneficial effects of this technical solution are: the fluororubber anti-slip pad has a friction coefficient of 0.8, which is twice that of the original metal push rod; the diamond-shaped anti-slip texture further increases friction, preventing workpiece displacement caused by cutting vibration; and the double-sided cutting alignment error is reduced from ±0.1mm of the original fixture to ±0.03mm.

[0014] Based on the above technical solutions, as a preferred technical solution for the laser cutting fixture of the PCBN composite sheet, the heat dissipation channel extends through the front and rear sides of the fixture body at both ends. The heat-conducting material is aluminum nitride ceramic particles. The front of the fixture body is provided with heat dissipation holes communicating with the heat dissipation channel. The diameter of the heat dissipation holes is 2-3 mm, and the spacing is 10-15 mm. The further beneficial effects of this technical solution are: the thermal conductivity of aluminum nitride ceramic is 170 W / m·K, which is more than 5 times that of the original fixture body material. Combined with the heat dissipation holes, a "channel + hole" dual heat dissipation is formed. During cutting, the temperature of the workpiece contact part is reduced from 80-120℃ in the original fixture to 40-60℃, the workpiece thermal damage rate is reduced by 60%, and the risk of fixture deformation is reduced by 80%.

[0015] Based on the above technical solution, as a preferred technical solution for the laser cutting fixture of the PCBN composite sheet, the fixture body has a groove corresponding to the positioning hole, and a dust plug coaxial with the positioning hole is provided in the groove. The center of the dust plug has a central hole that dynamically seals with the outer wall of the positioning rod. Further beneficial effects of this technical solution are: the dust plug effectively prevents cutting dust from entering the positioning hole, avoids jamming of the positioning rod, increases the positioning rod adjustment accuracy retention rate from 60% of the original fixture to 95%, and reduces the fixture maintenance frequency from once a week to once a month.

[0016] Based on the above technical solution, as a preferred technical solution for the PCBN composite sheet laser cutting fixture, the detachable mounting protrusion includes a base threadedly connected to the side of the fixture body and a T-shaped mounting block located on the outside of the base; the base is available in at least two specifications. A further beneficial effect of this technical solution is that by replacing the base and T-shaped mounting block with different specifications, it can be adapted to more than 80% of laser cutting machine worktables on the market, solving the problem of limited compatibility of the original fixture, and reducing the installation adaptation time from 30 minutes to 5 minutes.

[0017] Based on the above technical solution, as a preferred technical solution for the laser cutting fixture of the PCBN composite sheet, the T-shaped mounting block is provided with a waist-shaped mounting hole, the length of which is 15-20mm and the width is 8-10mm. A further beneficial effect of this technical solution is that the waist-shaped mounting hole allows for ±2.5mm adjustment of the installation position, eliminating the need for precise alignment with the worktable screw holes, thus improving installation efficiency by 50%. Simultaneously, it accommodates slight deformation of the worktable, ensuring the fixture is horizontally fixed.

[0018] Based on the above technical solutions, as a preferred technical solution for the laser cutting fixture of the PCBN composite sheet, the front of the fixture body is provided with positioning scale lines corresponding one-to-one with the clamping holes. The positioning scale lines have an accuracy of 0.05mm and are compatible with the positioning system of the laser cutting machine. A further beneficial effect of this technical solution is that the positioning scale lines are linked with the positioning system of the laser cutting machine. During double-sided cutting, manual drawing alignment is unnecessary; automatic alignment of the cutting surfaces can be achieved simply by matching the scale lines. The alignment time is reduced from 5-8 minutes for the original fixture to 10-15 seconds, increasing batch processing efficiency by 40%.

[0019] The overall beneficial effects of the various technical solutions provided in this application are to achieve the following core improvements: Compatibility: Compatible with round, square, polygonal and irregular shaped workpieces, with a clamping size range of 5-50mm, without the need to change the clamps.

[0020] Accuracy: Positioning error reduced from ±0.1mm to ±0.02mm, double-sided cutting alignment error ±0.03mm, meeting the requirements of high-precision processing.

[0021] Heat dissipation and dust prevention: The workpiece thermal damage rate is reduced by 60%, the risk of fixture deformation is reduced by 80%, and the positioning pin adjustment accuracy retention rate reaches 95%.

[0022] Versatility: Compatible with over 80% of laser cutting machine models, reducing installation time by 83%.

[0023] Efficiency: Multi-workpiece clamping operation time is reduced by 50%, batch processing efficiency is increased by 40%, cutting cost is reduced by 30%, and overall performance is superior to the original fixture. Attached Figure Description

[0024] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 1 A sectional view; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; The markings in the diagram are as follows: 1-Clamping body, 2-Clamping hole, 21-Adjustable clamping module, 211-Arc-shaped clamping plate, 212-Elastic positioning block, 213-Wear-resistant pad, 3-Positioning hole, 4-Positioning top rod, 41-Screw, 42-Pressure sensor, 43-Digital display screen, 44-Anti-slip pad, 5-Heat dissipation channel, 51-Heat-conducting material, 52-Heat dissipation hole, 6-Removable mounting protrusion, 61-Base, 62-T-shaped mounting block, 621-Oval mounting hole, 7-Groove, 71-Dust plug, 711-Center hole, 8-Positioning scale line, 9-Workpiece. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the core concept of the present utility model and the following embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] These embodiments are provided to make the application thorough and complete, and to fully express the scope of the application to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​illustrated in these embodiments should be interpreted as merely exemplary and not as limiting.

[0028] It should be noted that, in the description of this application, unless otherwise stated, "several" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "axial," "radial," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] Furthermore, the terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0030] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0031] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0032] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0033] like Figures 1 to 3 As shown, a PCBN composite sheet laser cutting fixture includes a fixture body 1. The front of the fixture body 1 has at least two clamping holes 2, and each clamping hole 2 is provided with an adjustable clamping module 21. The bottom surface of the fixture body 1 has a positioning hole 3 perpendicular to the clamping holes 2. A positioning top rod 4 with pressure detection is installed in the positioning hole 3. A heat dissipation channel 5 parallel to the clamping holes 2 is opened inside the fixture body 1. The heat dissipation channel 5 is filled with a thermally conductive material 51. The side of the fixture body 1 has a detachable mounting protrusion 6.

[0034] The beneficial effects of this embodiment are as follows: the "adjustable clamping module 21" is compatible with workpieces of various shapes, solving the problem of limited adaptability of the original fixture; the "positioning rod 4 with pressure detection" realizes quantitative control of positioning force, reducing manual errors; the "heat dissipation channel 5 + heat-conducting material 51" quickly dissipates cutting heat, reducing workpiece thermal damage and fixture deformation; the "detachable mounting protrusion 6" is compatible with different models of laser cutting machines, improving installation versatility and fundamentally solving the core defects of the original fixture.

[0035] Based on the above embodiments, as a preferred embodiment of the PCBN composite sheet laser cutting fixture, the adjustable clamping module 21 includes an arc-shaped clamping plate 211 that slides along the inner wall of the clamping hole 2 and an elastic positioning block 212 that connects the arc-shaped clamping plate 211 with the inner wall of the clamping hole 2.

[0036] Preferably, the elastic positioning block 212 is made of silicone rubber and has a compression range of 0-5mm.

[0037] Further beneficial effects of this embodiment are: the arc-shaped clamping plate 211 can slide adaptively with the shape of the workpiece, and the elastic positioning block 212 provides a stable clamping force. It can be compatible with round and polygonal workpieces, and can also fit the surface of irregularly shaped workpieces through elastic deformation. The clamping and adaptation range is extended to more than 3 times that of the original clamp, without the need to replace the clamp.

[0038] Based on the above embodiments, as a preferred embodiment of the laser cutting fixture for PCBN composite sheets, the inner side of the arc-shaped clamping plate 211 is provided with a wear-resistant pad 213, which is a tungsten carbide coating with a thickness of 0.1-0.2mm.

[0039] Further beneficial effects of this embodiment are: the hardness of the tungsten carbide coating reaches HRC65 or higher, reducing frictional wear between the workpiece and the clamping plate, increasing the service life of the inner wall of the clamping hole 2 from 300 cuts of the original fixture to more than 1000 cuts, while avoiding surface damage to the workpiece.

[0040] Based on the above embodiments, as a preferred embodiment of the PCBN composite sheet laser cutting fixture, the positioning top rod 4 includes a screw 41, a pressure sensor 42 located at the top of the screw 41, and a digital display screen 43 located at the bottom of the screw 41, which can display the clamping pressure in real time, in N.

[0041] Further beneficial effects of this embodiment are: the pressure sensor 42 and digital display screen 43 realize the quantification of positioning force with an accuracy of ±0.5N, avoid workpiece displacement caused by uneven manual adjustment of force, and reduce the positioning error from ±0.1mm of the original fixture to ±0.02mm. At the same time, it facilitates the uniform clamping force of multiple workpieces.

[0042] Based on the above embodiments, as a preferred embodiment of the PCBN composite sheet laser cutting fixture, the top of the screw 41 of the positioning push rod 4 is provided with an anti-slip pad 44. The anti-slip pad 44 is made of fluororubber and has a diamond-shaped anti-slip texture on its surface. A further beneficial effect of this embodiment is that the fluororubber anti-slip pad 44 has a friction coefficient of 0.8, which is twice that of the original metal push rod. The diamond-shaped anti-slip texture further increases friction, preventing workpiece displacement caused by cutting vibration. The double-sided cutting alignment error is reduced from ±0.1mm of the original fixture to ±0.03mm.

[0043] Based on the above embodiments, as a preferred embodiment of the PCBN composite sheet laser cutting fixture, the heat dissipation channel 5 extends through the front and rear sides of the fixture body 1 at both ends, the heat-conducting material 51 is aluminum nitride ceramic particles, and the front of the fixture body 1 is provided with heat dissipation holes 52 that communicate with the heat dissipation channel 5.

[0044] Preferably, the heat dissipation holes 52 have a diameter of 2-3 mm and a spacing of 10-15 mm.

[0045] Further beneficial effects of this embodiment are: the thermal conductivity of aluminum nitride ceramic is 170W / m・K, which is more than 5 times that of the original fixture material. Combined with the heat dissipation holes 52, it forms a "channel + hole" dual heat dissipation. During cutting, the temperature of the workpiece contact part drops from 80-120℃ in the original fixture to 40-60℃, the workpiece thermal damage rate is reduced by 60%, and the risk of fixture deformation is reduced by 80%.

[0046] Based on the above embodiments, as a preferred embodiment of the PCBN composite sheet laser cutting fixture, the fixture body 1 has a groove 7 at the position corresponding to the positioning hole 3. The groove 7 is provided with a dust plug 71 coaxial with the positioning hole 3. The dust plug 71 has a central hole 711 in the center that dynamically seals with the outer wall of the positioning rod 4. The further beneficial effects of this embodiment are: the dust plug 71 effectively blocks cutting dust from entering the positioning hole 3, avoids the positioning rod 4 from getting stuck, increases the positioning rod adjustment accuracy retention rate from 60% of the original fixture to 95%, and reduces the fixture maintenance frequency from once a week to once a month.

[0047] Based on the above embodiments, as a preferred embodiment of the PCBN composite sheet laser cutting fixture, the detachable mounting protrusion 6 includes a base 61 threadedly connected to the side of the fixture body 1 and a T-shaped mounting block 62 disposed on the outside of the base 61; the base 61 is provided in at least two specifications. Preferably, two specifications with heights of 10mm and 15mm are adopted.

[0048] Further beneficial effects of this embodiment are: by replacing the base 61 of different specifications and the T-shaped mounting block 62, it can be adapted to more than 80% of the laser cutting machine worktables on the market, solving the problem of limited compatibility of the original fixture installation, and shortening the installation and adaptation time from 30 minutes of the original fixture to 5 minutes.

[0049] Based on the above embodiments, as a preferred embodiment of the PCBN composite sheet laser cutting fixture, the T-shaped mounting block 62 is provided with a waist-shaped mounting hole 621, which is 15-20mm long and 8-10mm wide. A further beneficial effect of this embodiment is that the waist-shaped mounting hole 621 allows for ±2.5mm adjustment of the installation position, eliminating the need for precise alignment with the worktable screw holes, thus improving installation efficiency by 50%. It also accommodates slight deformation of the worktable, ensuring the fixture body 1 is horizontally fixed.

[0050] Based on the above embodiments, as a preferred embodiment of the PCBN composite sheet laser cutting fixture, the front of the fixture body 1 is provided with positioning scale lines 8 corresponding one-to-one with the clamping holes 2. The positioning scale lines 8 have an accuracy of 0.05mm and are compatible with the laser cutting machine positioning system. A further beneficial effect of this embodiment is that the positioning scale lines 8 are linked with the laser cutting machine positioning system, eliminating the need for manual drawing alignment during double-sided cutting. Automatic alignment of the cutting surfaces can be achieved simply by matching the scale lines, reducing the alignment time from 5-8 minutes for the original fixture to 10-15 seconds, and improving batch processing efficiency by 40%.

[0051] Preferably, such as Figure 1 As shown: The fixture body 1 is a cuboid structure with four clamping holes 2 evenly distributed on the front. Each clamping hole 2 is provided with a positioning scale line 8 next to it. Two detachable mounting protrusions 6 are installed on each of the left and right sides of the fixture body 1. Heat dissipation holes 52 are evenly distributed on the front. The workpiece 9 is placed in the clamping holes 2.

[0052] Specifically as follows: Main body: Rectangular clamp body 1, dimensions 200×100×50mm, material is 6061 aluminum alloy.

[0053] Clamping holes: There are 4 circular clamping holes 2 on the front, with a diameter of 30mm and a center-to-center distance of 50mm; each clamping hole 2 is engraved with a positioning scale line 8, with a scale range of 0-30mm and an accuracy of 0.05mm.

[0054] Mounting protrusions: Two detachable mounting protrusions 6 on each side, base 61 with a diameter of 12mm, and T-shaped mounting block 62 with dimensions of 20×15×8mm.

[0055] Heat dissipation holes: 20 heat dissipation holes are evenly distributed on the front, with a diameter of 2.5mm, arranged in a matrix of 4 rows and 5 columns.

[0056] like Figure 2As shown: The cross-sectional view shows that the positioning hole 3 is perpendicular to the clamping hole 2, the screw 41 of the positioning rod 4 is screwed into the positioning hole 3, the top pressure sensor 42 is in contact with the workpiece 9, and the bottom digital display screen 43 is exposed on the bottom surface of the clamp body 1; the heat dissipation channel 5 inside the clamp body 1 is filled with heat-conducting material 51, and the two ends penetrate through the front and rear sides of the clamp body 1; the groove 7 is embedded with a dust plug 71, covering the bottom of the positioning hole 3.

[0057] Specifically as follows: Positioning hole: 8mm diameter threaded hole 3, 40mm depth, vertically penetrating to clamping hole 2.

[0058] Positioning rod: Screw 41, diameter 8mm, length 50mm; Pressure sensor 42, model PT124G-210, range 0-100N; Digital display screen 43, size 15×10mm, display accuracy 0.1N; Anti-slip pad 44, diameter 10mm, thickness 3mm, surface diamond anti-slip texture 441, spacing 1mm.

[0059] Heat dissipation channel: Rectangular heat dissipation channel 5, size 10×5mm, length 200mm, runs through the front and back sides of the clamp body, filled with aluminum nitride ceramic particles 51, particle size 1-2mm.

[0060] Groove and dust plug: Groove 7 has a diameter of 15mm and a depth of 5mm; dust plug 71 has a diameter of 15mm and a thickness of 5mm, and has a φ8mm through hole in the center that is coaxial with positioning hole 3.

[0061] like Figure 3 As shown in the enlarged view: the adjustable clamping module 21 has an arc-shaped clamping plate 211 that fits against the surface of the workpiece 9. The inner side is provided with a wear-resistant pad 213, and the outer side is connected to the inner wall of the clamping hole 2 through an elastic positioning block 212. The elastic positioning block 212 is in a slightly compressed state.

[0062] Specifically as follows: Arc-shaped clamps: Two symmetrical arc-shaped clamps 211, with their convex sides facing each other and their concave sides connected to the clamping space 2 via elastic positioning blocks 212; the arc-shaped clamps 211 are made of 304 stainless steel, with a thickness of 2mm and an arc radius of 15mm. This is a preferred embodiment. The convex workpiece 9 of the arc-shaped clamps 211 can be clamped between the two arc-shaped clamps 211 and the positioning top rod 4. Since the concave side of each arc-shaped clamp 211 is supported by an elastic positioning block 212, the workpiece 9 can be stably positioned regardless of its shape.

[0063] Elastic positioning blocks: Two silicone rubber elastic positioning blocks 212 are connected to the outside of the arc-shaped clamping plate 211. The size is 10×8×5mm and the Shore hardness is 50±5A.

[0064] Wear-resistant pad: The inner side of the arc-shaped clamp 211 is sprayed with a tungsten carbide coating 213 with a thickness of 0.15mm and a surface roughness Ra≤0.2μm.

[0065] Matching relationship: One end of the elastic positioning block 212 is bonded to the inner wall of the clamping hole 2, and the other end is bonded to the outer side of the arc-shaped clamping plate 211, with a compression of 2mm, providing a clamping force of about 30N.

[0066] The following example, taking the cutting of irregular PCBN composite sheets—workpiece 9, with dimensions of 20×15×5mm—illustrates the specific application of this utility model: Step 1: Fixture Installation According to the specifications of the laser cutting machine worktable, select a base 61 with a height of 15mm, and fix the detachable mounting protrusion 6 to the left and right sides of the clamp body 1 by thread connection.

[0067] Place the clamp body 1 on the workbench and fix it with bolts through the waist-shaped mounting hole 621 of the T-shaped mounting block 62. Adjust the position of the waist-shaped mounting hole 621 to ensure that the clamp body 1 is horizontal and calibrate it with a level.

[0068] Step 2: Workpiece clamping and positioning Remove the dust plug 71 from the groove 7 and place the workpiece 9 into the clamping hole 2.

[0069] The workpiece 9 pushes the arc-shaped clamping plate 211 to slide, the elastic positioning block 212 compresses and provides clamping force, and the wear-resistant pad 213 on the inner side of the arc-shaped clamping plate 211 fits against the workpiece surface to achieve adaptive clamping.

[0070] Rotate the screw 41 of the positioning rod 4 and observe the digital display screen 43. Stop adjusting when the pressure is displayed as 50N. Preset different forces according to different workpiece materials. The diamond-shaped anti-slip texture of the anti-slip pad 44 prevents the workpiece from sliding.

[0071] Step 3: Cut the first side Start the laser cutting machine, align the laser cutting head with the first cutting line of the workpiece 9 using the positioning scale line 8 on the front of the fixture 1, and set the cutting speed to 5mm / s.

[0072] During the cutting process, the aluminum nitride ceramic particles 51 in the heat dissipation channel 5 conduct heat out through the heat dissipation holes 52, and the surface temperature of the workpiece 9 is maintained at about 45°C, with no obvious thermal damage.

[0073] Step 4: Align the double-sided cuts with the second cut. After the first side is cut, loosen the mounting bolts and rotate the clamp 1180°.

[0074] By linking the positioning scale line 8 with the positioning system of the laser cutting machine, the second cutting line is aligned with the first cutting line with an alignment error of ±0.03mm, and the clamping body 1 is re-fixed.

[0075] Keeping the cutting parameters unchanged, the second side was cut, and the entire alignment process took only 12 seconds.

[0076] Step 5: Workpiece removal and fixture maintenance Rotate the positioning rod 4 in the opposite direction. The digital display screen 43 shows that the pressure has dropped to 0N. Take out the workpiece 9. The cut surface is flat and the roughness Ra≤0.8μm.

[0077] Re-insert the dust plug 71 into the groove 7 to prevent dust from entering the positioning hole 3; clean the dust in the heat dissipation channel 5 once a month to ensure heat dissipation effect.

[0078] This embodiment can be flexibly adjusted: if clamping a circular workpiece, such as a φ10mm PCBN composite sheet, the arc-shaped clamping plate 211 naturally fits the circular surface, and the elastic positioning block 212 provides uniform clamping force; if adapting to different worktables, only the base 61 of different heights needs to be replaced, without replacing the entire fixture. The ease of operation and versatility are significantly better than existing fixtures.

[0079] Any aspects of this utility model that are not detailed herein are conventional technical means known to those skilled in the art.

[0080] The above content shows and describes the basic principles, main features, and beneficial effects of this utility model. The above description is merely a preferred embodiment of this utility model and is not intended to limit it. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A laser cutting fixture for PCBN composite sheets, characterized in that: The clamping body (1) has at least two clamping holes (2) on its front side, and each clamping hole (2) is provided with an adjustable clamping module (21). The bottom surface of the clamping body (1) is provided with a positioning hole (3) perpendicular to the clamping hole (2). A positioning top rod (4) with pressure detection is installed in the positioning hole (3). A heat dissipation channel (5) parallel to the clamping hole (2) is provided inside the clamping body (1). The heat dissipation channel (5) is filled with a heat-conducting material (51). A detachable mounting protrusion (6) is provided on the side of the clamping body (1).

2. The PCBN composite sheet laser cutting fixture according to claim 1, characterized in that: The adjustable clamping module (21) includes an arc-shaped clamping plate (211) that slides along the inner wall of the clamping hole (2) and an elastic positioning block (212) that connects the arc-shaped clamping plate (211) to the inner wall of the clamping hole (2).

3. The PCBN composite sheet laser cutting fixture according to claim 2, characterized in that: The inner side of the arc-shaped clamp (211) is provided with a wear-resistant liner (213), which is a tungsten carbide coating with a thickness of 0.1-0.2 mm.

4. The PCBN composite sheet laser cutting fixture according to any one of claims 1-3, characterized in that: The positioning rod (4) includes a screw (41), a pressure sensor (42) located at the top of the screw (41), and a digital display screen (43) located at the bottom of the screw (41).

5. The PCBN composite sheet laser cutting fixture according to claim 4, characterized in that: The top of the screw (41) of the positioning rod (4) is provided with an anti-slip pad (44), which is made of fluororubber and has a diamond-shaped anti-slip pattern on its surface.

6. The PCBN composite sheet laser cutting fixture according to claim 3, characterized in that: The heat dissipation channel (5) extends through the front and rear sides of the clamp body (1) at both ends. The heat-conducting material (51) is aluminum nitride ceramic particles. The front of the clamp body (1) is provided with heat dissipation holes (52) that communicate with the heat dissipation channel (5).

7. The PCBN composite sheet laser cutting fixture according to any one of claims 1-3 and 5-6, characterized in that: The clamping hole (2) is provided with a groove (7) at the position corresponding to the positioning hole (3). A dust plug (71) coaxial with the positioning hole (3) is provided in the groove (7). The center of the dust plug (71) is provided with a central hole (711) that dynamically seals with the outer wall of the positioning rod (4).

8. The PCBN composite sheet laser cutting fixture according to claim 7, characterized in that: The detachable mounting protrusion (6) includes a base (61) threaded to the side of the clamping body (1) and a T-shaped mounting block (62) located on the outside of the base (61); the base (61) is available in at least two specifications.

9. The PCBN composite sheet laser cutting fixture according to claim 8, characterized in that: The T-shaped mounting block (62) has a waist-shaped mounting hole (621).

10. The PCBN composite sheet laser cutting fixture according to any one of claims 1-3, 5-6, and 8-9, characterized in that: The clamping body (1) has positioning scale lines (8) on the front that correspond one-to-one with the clamping holes (2).

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