Clamping device for PCD tool production

Abstract

The invention provides a clamping device for PCD cutter production, and relates to the technical field of welding positioning, the clamping device comprises a vacuum brazing furnace, a control table and a workbench, a fixing mechanism for fixing a PCD cutter body is arranged in the vacuum brazing furnace, an adjusting mechanism convenient to adjust is arranged on the fixing mechanism, and the control table is connected with the workbench. The fixing mechanism comprises a clamping disc, an embedded block, a side edge block and a transmission rod, the adjusting mechanism comprises an invar arc-shaped plate and a brass arc-shaped plate, and the clamping disc is installed on the inner side wall of the vacuum brazing furnace in a sliding mode. According to the device, the invar arc-shaped plate and the brass arc-shaped plate are matched, the honeycomb graphite gasket is arranged between the invar arc-shaped plate and the brass arc-shaped plate, various problems caused by thermal expansion are effectively solved in the high-temperature vacuum brazing process, the invar arc-shaped plate and the brass arc-shaped plate can generate relative displacement due to different thermal expansion coefficients, and the thermal expansion coefficient of the invar arc-shaped plate and the brass arc-shaped plate is reduced. And the honeycomb graphite gasket can be subjected to compression deformation, so that elastic potential energy is stored, and extra stress generated by metal thermal expansion is buffered.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding positioning, and more specifically, relates to a clamping device for producing PCD tools. Background Art

[0002] Vacuum brazing is a brazing process performed in a vacuum environment (usually with a vacuum degree ≥1×10⁻³Pa). The process melts the brazing filler metal by heating and wets the surface of the base material. Capillary action fills the gap in the joint, and a strong connection is formed after cooling. Vacuum brazing of PCD tools melts the brazing filler metal at high temperatures in a vacuum environment, firmly connecting the polycrystalline diamond (PCD) insert to the carbide or steel tool body. This prevents PCD from oxidizing or graphitizing at high temperatures (because vacuum isolates oxygen and allows for precise temperature control), while ensuring high strength and minimal deformation of the welded joint.

[0003] Chinese Patent Publication No. CN105563018A describes a method for vacuum brazing a DCMP aluminum alloy chassis. This method removes excess brazing material from the workpiece after welding, mills away process allowances and process bosses, drills holes as required, and performs surface treatment on the workpiece. This method offers a simple process, ease of manufacture, and guaranteed workpiece quality and dimensional accuracy, reducing production costs and improving efficiency.

[0004] Existing PCD vacuum brazing machines have the following disadvantages when performing welding:

[0005] 1. Regarding tool body fixation convenience, traditional fixation methods lack an effective pre-fixing mechanism. When fixing multiple PCD tool bodies, operators must expend considerable time and effort to precisely locate and initially secure each tool body, a cumbersome and inefficient process. For example, when batch welding PCD tools, the tool bodies must be precisely positioned and initially secured manually each time. This not only consumes labor but also significantly prolongs the entire fixation process, reducing production efficiency.

[0006] 2. Fixturing efficiency issues are prominent during mass production. Traditional fixtures typically require individual adjustments to secure multiple PCD tool bodies, resulting in complex and labor-intensive operations. In the context of mass welding PCD tools, this individual adjustment method severely restricts production efficiency and fails to meet the growing market demand for PCD tools.

[0007] 3. Thermal expansion issues can occur during high-temperature vacuum brazing. The high-temperature vacuum brazing environment used for PCD blade welding is subject to a wide range of temperature fluctuations. As the metal components of the fixture expand and contract due to varying thermal expansion coefficients, they shift relative to each other, exerting uneven forces on the blade. On the one hand, excessive stress at high temperatures can damage the blade due to uneven force. On the other hand, during cooling, metal contraction can relax the clamping force, causing the blade to shift. This ultimately leads to poor weld quality, resulting in weak welds, and blade misalignment. Summary of the Invention

[0008] In order to solve the above technical problems, the present invention provides a clamping device for PCD tool production to solve the above problems.

[0009] The tool holder is fixed on the workbench, and the tool holder is fixed on the workbench, and the tool holder is fixed on the workbench, and the tool holder is fixed on the workbench, and the tool holder is fixed on the workbench, and the tool holder is fixed on the workbench, and the tool holder is fixed on the workbench, and the tool holder is fixed on the workbench, and the tool holder is fixed on the workbench, and the tool holder is fixed on the workbench, and the tool holder is fixed on the workbench, and the tool holder is fixed on the workbench, and the tool holder is fixed on the workbench The two lugs have the form of a hole, and the two lugs are connected along the longitudinal axis of the wheel shaft, and the two lugs have the form of a hole, and the two lugs are connected along the longitudinal axis of the wheel shaft respectively.

[0010] Preferably, each of the side ends of the Invar curved plates is provided with an avoidance groove, each of the brass curved plates is slidably mounted on the inner side wall of each avoidance groove, and a honeycomb graphite gasket is fixedly mounted between each of the brass curved plates and each avoidance groove, and the honeycomb graphite gasket is located on the inner side wall of the avoidance groove.

[0011] Preferably, a fixing plate is provided at the side end of each brass arc-shaped plate, and a nickel-based high-temperature spring is fixedly installed between each fixing plate and the brass arc-shaped plate.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In the present invention, the pre-fixation of the PCD cutter body is achieved by cooperating with a fixing plate and a brass arc plate. In actual operation, when the PCD cutter body is placed between the two fixing plates, the nickel-based high-temperature spring will use its own elasticity to push the fixing plate to initially clamp the PCD cutter body, providing a preliminary positioning and fixing force for the PCD cutter body, helping the cutter body to quickly find the correct position, assisting in the subsequent formal clamping operation, and preliminarily fixing multiple PCD cutter bodies, thereby improving the convenience of PCD cutter body fixing.

[0014] In the present invention, by providing a fixing plate and a nickel-based high-temperature spring in combination, it is achieved that during the subsequent actual fixation, the deformation force of the nickel-based high-temperature spring is utilized to adapt to PCD cutter bodies with a certain tolerance range. Since PCD cutter bodies from different batches or production processes may have slight size differences, when the two Invar curved plates drive the fixing plate to further clamp and fix the PCD cutter body, the nickel-based high-temperature spring will be compressed or stretched accordingly according to the actual size of the cutter body, ensuring that the cutter body is firmly fixed within the clamping range. While ensuring the synchronous fixation of multiple cutter bodies, it shows a high degree of adaptability and improves the compatibility with cutter bodies of different specifications.

[0015] In the present invention, by providing a worm and a worm wheel in cooperation with each other, and with the cooperation of the transmission rod and the double-headed screw, it is achieved that by rotating a worm, multiple Invar curved plates can be driven to approach synchronously, thereby synchronously clamping and fixing multiple PCD cutter bodies. When welding PCD tools in batches, the steps of fixing the PCD cutter bodies are simplified, the work efficiency during batch production is improved, manpower is saved, and there is no need to adjust and fix them one by one.

[0016] The present invention effectively addresses various issues arising from thermal expansion during high-temperature vacuum brazing by combining curved Invar and brass plates with a honeycomb graphite gasket. Under high-temperature conditions, the curved Invar and brass plates will shift relative to each other due to their differing thermal expansion coefficients. The honeycomb graphite gasket compresses and deforms, storing elastic potential energy and buffering the additional stress generated by the metal's thermal expansion. This prevents excessive force from being applied to the PCD cutter body and damage from uneven force. This structure also functions during cooling, preventing a loss of clamping force due to metal contraction and ensuring a stable clamping state for the cutter body. This effectively addresses the effects of stress changes on the cutter body during thermal expansion and contraction.

[0017] In the present invention, by providing a honeycomb graphite gasket, fine adjustment and control of stress changes during the thermal expansion and contraction of the metal are achieved, ensuring the high stability of the PCD tool body clamping. During the compression process, the unique design of the honeycomb structure causes micro-contact between adjacent side walls. At this time, the interlayer sliding friction on the graphite surface consumes part of the mechanical energy and forms a damping force. At the same time, when the hole wall is deformed, the interlayer bonding force between the graphite crystal layers, that is, the van der Waals force, produces "viscous resistance", further attenuating the force fluctuation during rebound. This dual damping mechanism can effectively adapt to the relative displacement of the metal and greatly reduce the force fluctuation. Whether it is during the process of temperature increase expansion or temperature decrease contraction, it can ensure that the clamping force of the fixture on the PCD tool body is always maintained within a stable range, avoiding displacement or damage of the tool body due to large force fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the vacuum brazing furnace of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the clamping disk of the present invention;

[0020] Figure 3 It is a schematic structural diagram of the Invar curved plate of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the worm of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the transmission rod of the present invention;

[0023] Figure 6 It is a structural diagram of the side block of the present invention;

[0024] Figure 7 It is a structural schematic diagram of the fixing plate of the present invention;

[0025] Figure 8 It is a structural schematic diagram of the brass curved plate of the present invention.

[0026] In the figure, the correspondence between the component names and the drawing numbers is: 1. Vacuum brazing furnace; 11. Control console; 12. Workbench; 13. Box door; 2. Clamping plate; 21. Placement groove; 22. Movable slide; 3. Embedded block; 31. Mounting groove; 4. Side block; 41. Cylindrical hole; 42. Worm; 5. Transmission rod; 51. Worm gear; 52. Double-headed screw; 6. Invar curved plate; 61. Avoidance groove; 62. Sliding block; 63. Threaded groove; 64. Honeycomb graphite gasket; 7. Brass curved plate; 71. Fixed plate; 72. Nickel-based high-temperature spring. DETAILED DESCRIPTION

[0027] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0028] See also Figure 1 - Figure 8The present invention provides a clamping device for PCD tool production, including a vacuum brazing furnace 1, a control console 11 and a workbench 12. The vacuum brazing furnace 1 is provided with a fixing mechanism for fixing the PCD tool body, and the fixing mechanism is provided with an adjustment mechanism for easy adjustment. The fixing mechanism includes a clamping plate 2, an embedded block 3, a side block 4 and a transmission rod 5. The adjustment mechanism includes an Invar curved plate 6 and a brass curved plate 7. The clamping plate 2 is slidably mounted on the inner side wall of the vacuum brazing furnace 1, and the side end of the clamping plate 2 is penetrated by at least two movable slide grooves 22. The embedded block 3 is fixedly mounted on the inner wall of the movable slide 22, the side block 4 is fixedly mounted on the side end of the clamping plate 2, the Invar curved plate 6 is located on the clamping plate 2, and the brass curved plate 7 is located on the side end of the Invar curved plate 6. The vacuum brazing furnace 1 is fixedly mounted on the upper end of the workbench 12, and a console 11 is fixedly mounted on the upper end of the vacuum brazing furnace 1. The side end of the vacuum brazing furnace 1 is hinged with a box door 13. When welding PCD tools, the welding surfaces of the PCD tool body and the PCD insert must be precisely processed to remove burrs, oil stains and oxidation. The brazing material is placed on the welding surface of the PCD tool body, and the PCD blade is assembled on the PCD tool body to ensure that the joint area is completely covered. The assembled PCD tool body is fixed with a clamp, and the door 13 is opened. The assembled workpiece is placed in the vacuum brazing furnace 1. After closing the door 13, the vacuum pump is started by operating the console 11. First, a low vacuum is drawn to remove most of the air, and then the high vacuum pump (molecular pump or diffusion pump) is switched to a high vacuum to avoid oxidation. Then the console 11 can be operated to slowly increase the vacuum in the vacuum brazing furnace 1. Heat up to remove moisture and organic impurities from the base material and the solder to avoid the formation of pores. Then operate the control console 11 to raise the temperature in the vacuum brazing furnace 1 to the melting point of the solder. Accelerate the heating rate to reach the liquidus temperature of the solder. At this time, the solder melts and wets the surface of the base material. Keep the temperature slightly higher than the melting point of the solder to allow the solder to fully wet and fill the gap. At the same time, promote atomic diffusion to form a transition layer. Turn off the heating device and cool it down with the vacuum brazing furnace 1 or introduce inert gas (such as argon) for rapid cooling. After the furnace temperature drops, open the furnace door and take out the workpiece.

[0029] At least two circular grooves 21 are provided on the upper end of the clamping disk 2, and each circular groove 21 is connected to the movable slide 22. The side ends of each embedded block 3 are penetrated by a mounting groove 31, and the side ends of the two side blocks 4 are penetrated by a cylindrical hole 41. The inner side walls of the two cylindrical holes 41 are rotatably mounted with the same worm 42. The number of the transmission rod 5 is multiple sections, and the same double-headed screw 52 is fixedly installed between each two sections of the transmission rod 5. Each double-headed screw 52 is located in the movable slide 22 just below each circular groove 21. The transmission rods 5 on both sides are rotatably mounted on the inner side walls of the mounting groove 31, and the circumferential ends of the transmission rod 5 are also fixedly mounted with a worm gear 51. The Invar curved plate 6 is located on the inner side wall of the circular groove 21. The Invar curved plate 6 is located on the inner side wall of the circular groove 21. A sliding block 62 is fixedly installed at the lower end of the plate 6, and the sliding block 62 is slidably installed on the inner side wall of the movable slide 22. A threaded groove 63 is penetrated by the side end of each sliding block 62, and each double-headed screw 52 is threadedly installed on the inner side wall of the threaded groove 63. An avoidance groove 61 is opened at the side end of each Invar curved plate 6, and each brass curved plate 7 is slidably installed on the inner side wall of each avoidance groove 61. A honeycomb graphite gasket 64 is fixedly installed between each brass curved plate 7 and each avoidance groove 61. The honeycomb graphite gasket 64 is located on the inner side wall of the avoidance groove 61. When the PCD tool body on the clamping plate 2 is placed in a vacuum brazing furnace 1 for high-temperature welding, the expansion of the brass curved plate 7 is much greater than that of the Invar curved plate 6, and the relative elongation difference between the two will The honeycomb graphite gasket 64 in the compression avoidance groove 61 offsets the increase in clamping force caused by the expansion of the brass arc plate 7 through the elastic force of the honeycomb graphite gasket 64, avoiding excessive clamping force to fracture the PCD. In the subsequent cooling stage, the contraction of the Invar arc plate 6 is greater than that of the brass arc plate 7. The relative contraction difference causes the honeycomb graphite gasket 64 to reset, and the clamping force is maintained by the nickel-based high-temperature spring 72 to avoid relaxation of the clamping force due to cold contraction. The material of the honeycomb graphite gasket 64 is high-temperature graphite with a purity of ≥99% and a temperature resistance of more than 2,000 degrees. It has the characteristics of high temperature resistance, low degassing rate, and interlayer sliding. The honeycomb structure can transform the brittleness of graphite into "controllable deformation-rebound" ability through a special porous grid design, while utilizing the energy in the structural deformation. Dissipation generates damping force. When the Invar curved plate 6 and the brass curved plate 7 produce relative displacement due to thermal expansion, the side wall of the honeycomb hole will bend and deform, storing elastic potential energy. During the cooling stage, the metal shrinks, the pressure is released, and the elastic deformation of the side wall of the honeycomb hole is restored, pushing the metal to reset and achieve "rebound". When under pressure, the adjacent side walls of the honeycomb hole will have a small contact, especially the honeycomb structure. The interlayer sliding friction on the graphite surface will consume part of the mechanical energy and form a damping force. When the hole wall is deformed, the relative sliding between the graphite crystal layers will produce "viscous resistance" due to the interlayer bonding force, that is, the van der Waals force, which further attenuates the force fluctuation during rebound, thereby adapting to the relative displacement of the brass curved plate 7 and the Invar curved plate 6, forming a damping force to reduce the force fluctuation and ensure stable clamping;

[0030] Each brass arc-shaped plate 7 is provided with a fixing plate 71 at the side end, and a nickel-based high-temperature spring 72 is fixedly installed between each fixing plate 71 and the brass arc-shaped plate 7. After the brazing material is applied between the PCD cutter body and the PCD blade, the PCD cutter body can be fixed. The user can place the PCD cutter body between the fixing plates 71 on the clamping plate 2. A nickel-based high-temperature spring 72 is set between the fixing plate 71 and the brass arc-shaped plate 7. When the PCD cutter body is placed between the fixing plates 71, the rebound thrust of the nickel-based high-temperature spring 72 will cause the fixing plates 71 on both sides to pre-clamp the PCD cutter body. The user can use the same method to pre-fix multiple PCD cutter bodies to be welded between each set of fixing plates 71 on the clamping plate 2. After completing the pre-fixation of the PCD cutter body After fixation, the user can rotate the worm 42, and the worm 42 and each worm wheel 51 are meshed. When the worm 42 rotates, it will drive each worm wheel 51 to rotate. When each worm wheel 51 rotates, it will drive the transmission rod 5 to rotate. When the transmission rod 5 rotates, it will drive each double-headed screw 52 to rotate. Because the double-headed screw 52 is threaded and installed on the inner side of the thread groove 63, when the double-headed screw 52 rotates, it will drive two sliding blocks 62 placed in the circular groove 21 to approach each other through the thread groove 63. The approach of the two sliding blocks 62 to each other will drive the two Invar curved plates 6 to approach each other, thereby compressing the nickel-based high-temperature spring 72, and the fixing plate 71 will further clamp and fix the PCD cutter body. Until each PCD cutter body is fixed and stable, the user can stop rotating the worm 42 to complete the fixation of the PCD cutter body.

[0031] Working principle:

[0032] The first step is to weld the PCD tool. The welding surface of the PCD tool body and the PCD insert must be precisely machined to remove burrs, oil stains and oxide layers. The brazing material is placed on the welding surface of the PCD tool body. The PCD insert is assembled on the PCD tool body to ensure that the joint area is completely covered. The assembled PCD tool body is fixed with a clamp. The door 13 is opened and the assembled workpiece is placed in the vacuum brazing furnace 1. After closing the door 13, the vacuum pump is started by operating the console 11. First, a low vacuum is drawn to remove most of the air. Then, the high vacuum pump (molecular pump or diffusion pump) is switched to a high vacuum to avoid oxygen. , and then the control console 11 can be controlled to slowly heat up the vacuum brazing furnace 1 to remove moisture and organic impurities in the base material and the brazing material to avoid the formation of pores. The control console 11 is then controlled to heat up the vacuum brazing furnace 1 to the melting point of the brazing material, and the heating rate is accelerated to reach the liquidus temperature of the brazing material. At this time, the brazing material melts and wets the surface of the base material. The temperature is kept slightly higher than the melting point of the brazing material to allow the brazing material to fully wet and fill the gap, while promoting atomic diffusion to form a transition layer. The heating device is turned off and the vacuum brazing furnace 1 can be cooled or an inert gas (such as argon) can be introduced for rapid cooling. After the furnace temperature drops, the furnace door can be opened to take out the workpiece.

[0033] In the second step, after the brazing material is applied between the PCD cutter body and the PCD insert, the PCD cutter body can be fixed. The user can place the PCD cutter body between the fixing plates 71 on the clamping plate 2. A nickel-based high-temperature spring 72 is set between the fixing plate 71 and the brass arc plate 7. When the PCD cutter body is placed between the fixing plates 71, the rebound thrust of the nickel-based high-temperature spring 72 will cause the fixing plates 71 on both sides to pre-clamp the PCD cutter body. The user can use the same method to pre-fix multiple PCD cutter bodies to be welded between each set of fixing plates 71 on the clamping plate 2. After completing the pre-fixation of the PCD cutter body, the user can rotate the worm 42, and the worm 42 and each worm wheel 5 1 are all meshed, and when the worm 42 rotates, it will drive each worm wheel 51 to rotate. When each worm wheel 51 rotates, it will drive the transmission rod 5 to rotate. When the transmission rod 5 rotates, it will drive each double-headed screw 52 to rotate. Because the double-headed screw 52 is threaded and installed on the inner side of the thread groove 63, when the double-headed screw 52 rotates, it will drive two sliding blocks 62 placed in the circular groove 21 to approach each other through the thread groove 63. The approach of the two sliding blocks 62 will drive the two Invar curved plates 6 to approach each other, thereby compressing the nickel-based high-temperature spring 72. The fixing plate 71 will further clamp and fix the PCD cutter body. After each PCD cutter body is fixed and stable, the user can stop rotating the worm 42 to complete the fixation of the PCD cutter body.

[0034] This device achieves pre-fixation of the PCD cutter body by providing a fixing plate 71 and a brass curved plate 7 in conjunction with each other. In actual operation, when the PCD cutter body is placed between the two fixing plates 71, the nickel-based high-temperature spring 72 will, by virtue of its own elasticity, push the fixing plate 71 to initially clamp the PCD cutter body, providing a preliminary positioning and fixing force for the PCD cutter body, helping the cutter body to quickly find its position and assisting in the subsequent formal clamping operation. It can also provide preliminary fixation for multiple PCD cutter bodies, thereby improving the convenience of PCD cutter body fixation.

[0035] By providing a fixing plate 71 and a nickel-based high-temperature spring 72 for cooperation, this device can utilize the deformation force of the nickel-based high-temperature spring 72 during subsequent actual fixing to adapt to PCD cutter bodies with a certain tolerance range. Since PCD cutter bodies from different batches or production processes may have slight size differences, when the two Invar curved plates 6 mutually drive the fixing plate 71 to further clamp and fix the PCD cutter body, the nickel-based high-temperature spring 72 will compress or expand accordingly according to the actual size of the cutter body, ensuring that the cutter body is firmly fixed within the clamping range. While ensuring the simultaneous fixing of multiple cutter bodies, it shows a high degree of adaptability and improves compatibility with cutter bodies of different specifications.

[0036] By arranging a worm 42 and a worm wheel 51 in coordination with each other, and with the cooperation of the transmission rod 5 and the double-headed screw 52, ​​this device realizes that by rotating a single worm 42, multiple Invar curved plates 6 can be driven to move synchronously toward each other, thereby synchronously clamping and fixing multiple PCD cutter bodies. When batch welding PCD tools, the steps of fixing the PCD cutter bodies are simplified, the work efficiency during batch production is improved, manpower is saved, and there is no need to adjust and fix them one by one.

[0037] In the third step, when the PCD tool body on the clamping plate 2 is placed in the vacuum brazing furnace 1 for high-temperature welding, the expansion of the brass arc plate 7 is much greater than that of the Invar arc plate 6. The relative elongation difference between the two will compress the honeycomb graphite gasket 64 in the avoidance groove 61, and the elastic force of the honeycomb graphite gasket 64 is used to offset the clamping force increase caused by the expansion of the brass arc plate 7, so as to avoid excessive clamping force and fracturing of the PCD. In the subsequent cooling stage, the contraction of the Invar arc plate 6 is greater than that of the brass arc plate 7. The relative contraction difference causes the honeycomb graphite gasket 64 to reset, and the clamping force is maintained by the nickel-based high-temperature spring 72 to avoid relaxation of the clamping force due to cold contraction. The material of the honeycomb graphite gasket 64 is high-temperature graphite with a purity of ≥99% and a temperature resistance of more than 2,000 degrees. It itself has the characteristics of high temperature resistance, low degassing rate, and interlayer sliding. The honeycomb structure can hold the graphite through a special porous grid design. The brittleness of the honeycomb is converted into "controllable deformation-rebound" ability, and the energy dissipation in the structural deformation is used to generate damping force. When the Invar curved plate 6 and the brass curved plate 7 produce relative displacement due to thermal expansion, the side wall of the honeycomb hole will bend and deform to store elastic potential energy. During the cooling stage, the metal shrinks, the pressure is released, and the elastic deformation of the side wall of the honeycomb hole is restored, pushing the metal to reset and achieve "rebound". When under pressure, the adjacent side walls of the honeycomb hole will have a small contact, especially the honeycomb structure. The interlayer sliding friction on the graphite surface will consume part of the mechanical energy and form a damping force. When the hole wall is deformed, the relative sliding between the graphite crystal layers will produce "viscous resistance" due to the interlayer bonding force, that is, the van der Waals force, which further attenuates the force fluctuation during rebound, thereby adapting to the relative displacement of the brass curved plate 7 and the Invar curved plate 6, forming a damping force to reduce the force fluctuation and ensure stable clamping.

[0038] This device effectively addresses various issues arising from thermal expansion during high-temperature vacuum brazing by arranging an Invar curved plate 6 and a brass curved plate 7 in combination, with a honeycomb graphite gasket 64 disposed therebetween. Under high-temperature conditions, the Invar curved plate 6 and the brass curved plate 7 will experience relative displacement due to their different thermal expansion coefficients, and the honeycomb graphite gasket 64 will be compressed and deformed, thereby storing elastic potential energy and buffering the additional stress generated by the thermal expansion of the metal, thereby avoiding excessive force on the PCD cutter body and preventing damage to the cutter body due to uneven force. During the cooling process, this structure also functions to avoid relaxation of the clamping force due to metal contraction, ensuring that the cutter body always maintains a stable clamping state, effectively addressing the impact of stress changes on the cutter body during thermal expansion and contraction.

[0039] By providing a honeycomb graphite gasket 64, this device achieves fine adjustment and control of stress changes during the thermal expansion and contraction of the metal, ensuring the high stability of the PCD tool body clamping. During the compression process, the unique design of the honeycomb structure causes micro-contact between adjacent side walls. At this time, the interlayer sliding friction on the graphite surface consumes part of the mechanical energy and forms a damping force. At the same time, when the hole wall deforms, the interlayer bonding force between the graphite crystal layers, that is, the van der Waals force, produces "viscous resistance", further attenuating the force fluctuation during rebound. This dual damping mechanism can effectively adapt to the relative displacement of the metal and greatly reduce the force fluctuation. Whether it is during the process of temperature increase expansion or temperature decrease contraction, it can ensure that the clamping force of the fixture on the PCD tool body is always maintained within a stable range, avoiding displacement or damage of the tool body due to large fluctuations in force.

[0040] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. A clamping device for producing PCD tools, comprising a vacuum brazing furnace (1), a control console (11) and a workbench (12), characterized in that: The vacuum brazing furnace (1) is provided with a fixing mechanism for fixing the PCD cutter body, and the fixing mechanism is provided with an adjustment mechanism for facilitating adjustment; The fixing mechanism comprises a clamping disc (2), an embedded block (3), a side block (4) and a transmission rod (5); the adjusting mechanism comprises an Invar arc plate (6) and a brass arc plate (7); the clamping disc (2) is slidably mounted on the inner wall of the vacuum brazing furnace (1); at least two movable slide grooves (22) are provided through the side end of the clamping disc (2); the embedded block (3) is fixedly mounted on the inner wall of the movable slide groove (22); the side block (4) is fixedly mounted on the side end of the clamping disc (2); the Invar arc plate (6) is located on the clamping disc (2); and the brass arc plate (7) is located on the side end of the Invar arc plate (6).

2. A clamping device for PCD tool production as claimed in claim 1, characterized in that: The vacuum brazing furnace (1) is fixedly mounted on the upper end of a workbench (12), a control console (11) is fixedly mounted on the upper end of the vacuum brazing furnace (1), and a door (13) is hingedly connected to the side end of the vacuum brazing furnace (1).

3. A clamping device for PCD tool production as claimed in claim 2, characterized in that: At least two placement circular grooves (21) are formed at the upper end of the clamping disc (2), and each of the placement circular grooves (21) is connected to the movable sliding groove (22).

4. A clamping device for PCD tool production as claimed in claim 3, characterized in that: A mounting groove (31) is provided through the side end of each of the inner blocks (3), a cylindrical hole (41) is provided through the side end of each of the two side blocks (4), and a same worm (42) is rotatably installed on the inner side walls of the two cylindrical holes (41).

5. A clamping device for PCD tool production as claimed in claim 4, characterized in that: The transmission rod (5) is provided in multiple sections, and a double-headed screw (52) is fixedly installed between each two sections of the transmission rod (5). Each double-headed screw (52) is located in a movable slide groove (22) directly below each placement circular groove (21).

6. A clamping device for PCD tool production as claimed in claim 5, characterized in that: The transmission rods (5) located on both sides are rotatably mounted on the inner side walls of the mounting groove (31), and the circumferential ends of the transmission rods (5) are also fixedly mounted with worm gears (51).

7. A clamping device for PCD tool production as claimed in claim 6, characterized in that: The Invar curved plate (6) is located on the inner side wall of the circular groove (21), and a sliding block (62) is fixedly mounted on the lower end of the Invar curved plate (6), and the sliding block (62) is slidably mounted on the inner side wall of the movable sliding groove (22).

8. A clamping device for PCD tool production as claimed in claim 7, characterized in that: A thread groove (63) is formed through the side end portion of each sliding block (62), and each double-headed screw (52) is threadably mounted on the inner side wall of the thread groove (63).

9. A clamping device for producing PCD tools as claimed in claim 8, characterized in that: Each of the side ends of the Invar curved plate (6) is provided with an avoidance groove (61), and each of the brass curved plates (7) is slidably mounted on the inner side wall of each avoidance groove (61). A honeycomb graphite gasket (64) is fixedly mounted between each of the brass curved plates (7) and each avoidance groove (61), and the honeycomb graphite gasket (64) is located on the inner side wall of the avoidance groove (61).

10. A clamping device for PCD tool production according to claim 9, characterized in that: A fixing plate (71) is provided at the side end of each brass arc-shaped plate (7), and a nickel-based high-temperature spring (72) is fixedly installed between each fixing plate (71) and the brass arc-shaped plate (7).

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