A grinding platform for nanocrystalline diamond sheets

Abstract

A grinding platform for nanocrystalline diamond sheets comprises an iron disc and a diamond grinding wheel mounted on a worktable, and a rotary table rotatably positioned between them. A connecting rod is fixedly connected to the rotary table, and a nanocrystalline diamond fixing device is located at the top of the connecting rod. The nanocrystalline diamond fixing device is rotatably mounted on the connecting rod and moves synchronously with the rotary table under the drive of the connecting rod. The nanocrystalline diamond fixing device includes a micrometer head and a clamping part fixed to the front end of the micrometer screw of the micrometer head. A support member for rotatably connecting to the connecting rod is also fixed on the clamping part fixed between the micrometer head and the micrometer screw. When the micrometer head rotates, its micrometer screw drives the metal tubes A and B of the clamping part to move unidirectionally and record the scale changes. This can improve the grinding rate of nanocrystalline diamond sheets and can be set according to different grinding thicknesses, reducing measurement steps.

Description

Technical Field

[0001] This utility model belongs to the field of polycrystalline diamond grinding technology, and specifically relates to a grinding platform for nano-polycrystalline diamond sheets. Background Technology

[0002] Grinding is widely used in the diamond processing industry due to its high processing accuracy and strong adaptability to workpiece materials. However, the energy consumed by grinding to remove a unit volume of material is far greater than that of other commonly used processing methods. Of this energy consumed, nearly 90% will accumulate in the grinding area in the form of grinding heat. This will lead to high temperature and high pressure in the grinding area, which will affect the service life of the grinding wheel and reduce the surface accuracy of the workpiece.

[0003] Nanocrystalline diamond has a strength more than twice that of ordinary single-crystal diamond, making it difficult to grind in grinding processes and requiring a lot of time and manpower.

[0004] The invention disclosed in CN111993270A is a nano-layer lubricated diamond grinding wheel device based on the shock wave cavitation effect. Its key technical features include a control system, an acceleration module, a shock wave acceleration module, a processing module, and a recovery module. The control system controls the operation of the device. The acceleration module, composed of an acceleration tube and a small Laval tube, enables the nanoparticles to acquire initial velocity. The shock wave acceleration module, composed of an electromagnetic coil, an impact head, an impact ball, a wave concentrator, and a large Laval tube, generates two wave sources: one cleans impurities on the grinding wheel surface, and the other impacts nanoparticles with initial velocity onto the grinding wheel surface to form a nano-layer. During processing, the nanoparticles in the nano-layer are autonomously released into the grinding core area, achieving self-lubrication and cooling within the grinding zone. The recovery module is used to recover the nanoparticles for reuse, primarily focusing on enhancing the lubrication and cooling effect.

[0005] The invention disclosed in CN114248170B is a device and method for directional adsorption of nano-aerosols in diamond grinding. The technical solution involves a three-stage acceleration and pressurization device that propels nanoparticles forward after the air pressure regulating valve is opened. A lubricating mixture generator injects a mixture into the acceleration device, giving the nano-aerosol particles a "coating." Through three-stage acceleration, the nano-aerosol particles are uniformly embedded into the grinding wheel surface to form a nano-layer, improving the lubrication and cooling effect in the core grinding area. During processing, the nanoparticles in the nano-layer are autonomously released into the core grinding area, significantly reducing grinding specific energy and minimizing the waste of grinding fluid. This solution primarily addresses the problems of insufficient lubrication and excessively high heat transfer temperature during diamond grinding of engineering ceramics, preventing nanoparticles from timely entering the core grinding area.

[0006] Further improvements and enhancements are still needed for the grinding equipment and grinding efficiency of nanodiamond sheets. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of the prior art by providing a grinding platform for nano-polycrystalline diamond sheets, thereby achieving efficient grinding of nano-polycrystalline diamond.

[0008] To solve the above technical problems, the technical solution adopted by this utility model is as follows: A grinding platform for nanocrystalline diamond wafers includes an iron disc and a diamond grinding wheel mounted on a worktable, and a rotary table rotatably arranged between the two. An electromagnetic heating device is fixed below the iron disc. The diamond grinding wheel rotates under the drive of an equipped motor. A connecting rod is fixedly connected to the rotary table, and a nanocrystalline diamond fixing device is provided on the top of the connecting rod. The nanocrystalline diamond fixing device is rotatably mounted on the connecting rod and moves synchronously with the rotary table under the drive of the connecting rod. The nanodiamond fixing device includes a micrometer head and a clamping part fixed to the front end of the micrometer screw of the micrometer head. The clamping part, which is fixed between the micrometer head and the micrometer screw, is also fixed with a support member for rotatably connecting with the connecting rod. The clamping part includes a metal tube A, a metal tube B sleeved in the metal tube A, and a metal clip inserted in the metal tube B. A buffer spring is fixed at the bottom of the metal tube A, and the other end of the buffer spring is connected to the metal tube B. The exposed part of the metal tube B that fits against the metal tube A is also provided with scale lines. An L-shaped limiting rod is also fixedly connected to the connecting rod, and a magnet for fixing the metal tube B is fixedly provided at the end of the L-shaped limiting rod. When the differential head rotates, its micrometer screw drives metal tube A and metal tube B to move in one direction.

[0009] The iron disc and the diamond grinding wheel are at the same horizontal level on the worktable.

[0010] The support member adopts a flat lug and is connected to a corresponding U-shaped fork lug fixed at the top of the connecting rod.

[0011] The flat lugs and U-shaped fork lugs are connected by pins or bolts and pre-tightened with nuts and washers.

[0012] The inner diameter of metal tube A is set to be the same as the outer diameter of metal tube B.

[0013] The metal clip is designed with a conical structure, and multiple limiting grooves are spaced apart on the cone.

[0014] The beneficial effects of this utility model are: (1) The grinding platform for nano-polycrystalline diamond sheets is provided by setting an iron disc and a diamond grinding wheel on the worktable and rotating a table between the two. A connecting rod is fixedly connected to the rotating table and a nano-diamond fixing device is provided on the top of the connecting rod. The nano-diamond fixing device is rotatably mounted on the connecting rod and moves synchronously with the rotating table under the drive of the connecting rod. The nano-diamond fixing device includes a micrometer head and a clamping part fixed to the front end of the micrometer screw of the micrometer head. A support member for rotating connection with the connecting rod is also fixed on the clamping part fixed between the micrometer head and the micrometer screw. When the micrometer head rotates, its micrometer screw drives the metal tube A and metal tube B of the clamping part to move unidirectionally and record the scale change, which can improve the grinding rate of nano-polycrystalline diamond sheets. At the same time, it can be set according to different grinding thicknesses to reduce the measurement process.

[0015] (2) The grinding platform utilizes the fact that diamond can react with iron at high temperature and the part of diamond in contact with iron is graphitized. Therefore, the method of first graphitizing the surface of nano-polycrystalline diamond and then grinding is more conducive to the grinding of nano-polycrystalline diamond and improves grinding efficiency. Attached Figure Description

[0016] Figure 1 This is a simplified structural diagram of the present invention; Figure 2 This is a schematic diagram of the nanodiamond fixing device; Figure 3 This is a schematic diagram of the metal card head. Detailed Implementation

[0017] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0018] This invention provides a grinding platform for nanocrystalline diamond sheets, such as... Figures 1 to 3 As shown.

[0019] A grinding platform for nanocrystalline diamond wafers includes an iron disc 1 and a diamond grinding wheel 6 mounted on a worktable, and a rotary table 8 rotatably arranged between them. During installation, the iron disc and the diamond grinding wheel are at the same horizontal height on the worktable. An electromagnetic heating device is fixed below the iron disc 1, and the diamond grinding wheel 6 rotates under the drive of an equipped motor. A connecting rod 2 is fixedly connected to the rotary table 8, and a nanocrystalline diamond fixing device 5 is provided on the top of the connecting rod 2. The nanocrystalline diamond fixing device 5 is rotatably mounted on the connecting rod 2 and moves synchronously with the rotary table 8 under the drive of the connecting rod 2. The nanocrystalline diamond fixing device 5 includes a micrometer head 17 and a clamping part fixed to the front end of the micrometer screw 12 of the micrometer head. A support member 4 for rotatably connecting with the connecting rod is also fixed on the clamping part 11 fixed between the micrometer head and the micrometer screw 12.

[0020] The clamping part includes a metal tube A13, a metal tube B15 sleeved in the metal tube A13, and a metal clip 16 clamped in the metal tube B15. A buffer spring 14 is fixed at the bottom of the metal tube A13, and the other end of the buffer spring 14 is connected to the metal tube B15. A scale line 18 is also provided at the exposed part of the metal tube B15 that fits against the metal tube A.

[0021] To enhance the limiting effect, an L-shaped limiting rod 7 is also fixedly connected to the connecting rod 2, and a magnet is fixed at the end of the L-shaped limiting rod 7 to fix the metal tube B, ensuring that the metal tube remains fixed.

[0022] The differential head uses an existing device, whose structure includes a differential cylinder 9 and a fixed sleeve 10. When the differential head 17 rotates, the micrometer screw 12 at the front end of the differential head drives the metal tube A13 and the metal tube B15 to move in one direction, resulting in a scale change.

[0023] In this embodiment, the support member adopts a flat lug 4, which is connected to the U-shaped fork lug 3 fixed at the top of the connecting rod 2. The flat lug 4 and the U-shaped fork lug 3 are connected by a pin or bolt, and are pre-tightened with nuts and washers to achieve rotation without shaking.

[0024] The inner diameter of the metal tube A13 is set to be the same as the outer diameter of the metal tube B15. One end of the metal tube B15 is connected to the buffer spring 14. The metal tube B15 is inserted into the metal tube A13. In the natural state of the buffer spring 14, there is a scale line 18 at the exposed part where the metal tube B and the metal tube A meet.

[0025] The metal clip 16 is designed with a conical structure, and multiple limiting grooves are spaced apart on the cone to ensure that the nano-polycrystalline diamond sheet can be fixed.

[0026] After placing the nano-polycrystalline diamond into the metal clip 16, insert the metal clip 16 into the metal tube B until the metal clip 16 secures the nano-polycrystalline diamond sheet.

[0027] Lift metal tube A13, rotate metal rod A, place metal tube A at the magnet at one end of L-shaped limit rod 7 and fix it, rotate micrometer head 17, micrometer screw 12 of micrometer head drives metal tube A and metal tube B to move in one direction until the nano-polycrystalline diamond sheet is close to the iron plate and the scale line at metal tube B remains unchanged, lock micrometer screw 12, and record the reading of micrometer head at this time.

[0028] Lift metal tube A, and correspondingly lift metal tube B. Open micrometer screw 12, rotate micrometer cylinder 9, lock micrometer screw 12, and lower metal tube A so that metal tube B is fixed to the magnet at one end of L-shaped limit rod 7.

[0029] The iron disc is then heated to 800℃. After heating for 30 seconds, metal tube A is lifted, metal rod A is rotated, and metal tube A is placed and fixed at the magnet at one end of the L-shaped limiting rod. The nano-polycrystalline diamond sheet is then pressed tightly against the diamond grinding wheel. After removing the surface carbonized layer, it is placed back on the iron disc and heated for another 30 seconds. Then it is placed on the diamond grinding wheel for grinding. This cycle is repeated until the graduation line at metal tube B is restored.

[0030] More specifically, the following description is provided in conjunction with detailed embodiments: In this invention, the electromagnetic heating device uses a small high-frequency induction heater to heat the iron disc 1, which is at the same horizontal level as the diamond grinding wheel 6. The motor that drives the diamond grinding wheel 6 has a threaded end, such as M12 / M14, machined on its shaft. The diamond grinding wheel 6 is fixed to the motor shaft by a flange with a threaded hole and locked with a nut, and anti-loosening washers are required.

[0031] Both the motor and the small high-frequency induction heater are fixed in corresponding positions below the worktable platform, using a desktop-grade small precision rotary table 8, such as the Velmex Rotary Table A5900TS (manual version), with a rotating base and a handwheel on the side. After rotating to the correct position, tightening the handwheel will lock it in place. The connecting rod 2 is a metal rod, which is inserted into the center hole and locked laterally with a set screw.

[0032] A metal rod is fixed to a rotatable rotary table 8. A U-shaped fork lug 3 is fixed to the metal rod. A flat plate lug 4 is connected to the U-shaped fork lug 3 by a pin or bolt that passes vertically through the fork lug and the lug. It is pre-tightened by a nut and washer to achieve rotation without wobbling. The flat plate lug 4 is connected and fixed to the bearing part 11 of the micrometer head 17. The front end of the micrometer screw 12 is connected to the metal tube A13. A buffer spring 14 is fixed inside the metal tube A13. The buffer spring 14 is not connected to the front end of the micrometer screw 12.

[0033] The outer diameter of metal tube B15 is the same as the inner diameter of metal tube A13. One end of metal tube B15 is connected to buffer spring 14. Metal tube B15 is inserted into metal tube A13. In the natural state of buffer spring 14, there is a scale line 18 at the exposed part where metal tube B15 and metal tube A13 meet. Metal tube B15 is used to place and fix metal clip 16, which is used to fix the nano-polycrystalline diamond sheet. An L-shaped limiting rod 7 is fixedly connected to the metal connecting rod 2, and is used to fix metal tube B15 by a fixed magnet.

[0034] In use, place the nano-polycrystalline diamond sheet in the metal chuck 16, then insert the metal chuck 16 into the metal tube B15 until the metal chuck 16 secures the nano-polycrystalline diamond sheet. Lift the metal tube A13 to prevent the diamond sheet from colliding with the iron plate. Rotate the rotary table 8, which will correspondingly drive the metal connecting rod 2 and the nano-diamond sheet fixing device 5 to rotate. After rotating to the corresponding position, retract the rotary table 8. Place the metal tube A13 and fix it at the magnet at one end of the L-shaped limiting rod 7. Rotate the micrometer cylinder 9, and the micrometer screw 12 of the micrometer head 17 will drive the metal tubes A13 and B15 to move unidirectionally until the nano-polycrystalline diamond sheet is close to the iron plate 1, and the position of the scale line 18 at the metal tube B remains unchanged. Lock the micrometer screw and record the reading of the micrometer head 17 at this time. Then lift metal tube A13 and corresponding metal tube B15, open the micrometer screw, rotate the micrometer cylinder 9, lock the micrometer screw, and lower metal tube A13 to the magnet at one end of the L-shaped limit rod 7 for fixation.

[0035] Heat the iron disc 1 to 800℃. After heating on the iron disc 1 for 30 seconds, lift the metal tube A13, unlock and rotate the rotary table 8. After rotating to the corresponding position, place the metal tube A13 onto the magnet at one end of the L-shaped limit rod 7 and fix it. The nano-polycrystalline diamond sheet is pressed tightly against the diamond grinding wheel 6. After removing the surface carbonized layer, place it back on the iron disc 1 and heat for 30 seconds. Then place it on the fixed diamond grinding wheel 6 for grinding. Repeat this process until the scale line 18 at the metal tube B returns to its original position.

[0036] This grinding platform utilizes the fact that diamond reacts with iron at high temperatures, causing the diamond-iron contact area to graphitize. Therefore, the method of first graphitizing the surface of nanocrystalline diamond before grinding is more beneficial for nanocrystalline diamond grinding and improves grinding efficiency.

[0037] If this patent uses terms such as "first" and "second" to define components, those skilled in the art should know that the use of "first" and "second" is merely for the convenience of describing this utility model and simplifying the description, and the above terms have no special meaning.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

[0039] In the description of this utility model, it should be understood that the terms "front", "rear", "left", "right", "center", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this utility model and simplify 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. Therefore, they should not be construed as limiting the scope of protection of this utility model.

Claims

1. A grinding platform for nanocrystalline diamond sheets, characterized in that: It includes an iron disc and a diamond grinding wheel mounted on a workbench, as well as a rotating table arranged between the two. An electromagnetic heating device is fixed under the iron disc. The diamond grinding wheel rotates under the drive of the motor. A connecting rod is fixed to the rotating table, and a nano-diamond fixing device is provided on the top of the connecting rod. The nano-diamond fixing device is rotatably mounted on the connecting rod and moves synchronously with the rotating table under the drive of the connecting rod. The nanodiamond fixing device includes a micrometer head and a clamping part fixed to the front end of the micrometer screw of the micrometer head. The clamping part, which is fixed between the micrometer head and the micrometer screw, is also fixed with a support member for rotatably connecting with the connecting rod. The clamping part includes a metal tube A, a metal tube B sleeved in the metal tube A, and a metal clip inserted in the metal tube B. A buffer spring is fixed at the bottom of the metal tube A, and the other end of the buffer spring is connected to the metal tube B. The exposed part of the metal tube B that fits against the metal tube A is also provided with scale lines. An L-shaped limiting rod is also fixedly connected to the connecting rod, and a magnet for fixing the metal tube B is fixedly provided at the end of the L-shaped limiting rod. When the differential head rotates, its micrometer screw drives metal tube A and metal tube B to move in one direction.

2. The grinding platform for nanocrystalline diamond sheets according to claim 1, characterized in that: The iron disc and the diamond grinding wheel are at the same horizontal level on the worktable.

3. A grinding platform for nanocrystalline diamond sheets according to claim 1, characterized in that: The support member adopts a flat lug and is connected to a corresponding U-shaped fork lug fixed at the top of the connecting rod.

4. A grinding platform for nanocrystalline diamond sheets according to claim 3, characterized in that: The flat lugs and U-shaped fork lugs are connected by pins or bolts and pre-tightened with nuts and washers.

5. A grinding platform for nanocrystalline diamond sheets according to any one of claims 1 to 4, characterized in that: The inner diameter of metal tube A is set to be the same as the outer diameter of metal tube B.

6. A grinding platform for nanocrystalline diamond sheets according to claim 5, characterized in that: The metal clip is designed with a conical structure, and multiple limiting grooves are spaced apart on the cone.

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