A processing method for special-shaped polycrystalline diamond

Abstract

The invention relates to the technical field of polycrystalline diamond processing, in particular to a processing method for special-shaped polycrystalline diamond, comprising: mixed raw materials, a base, a front plate, a left plate, a rear plate, a right plate and a top plate, and the specific steps are as follows: A, placing the front plate, the left plate, the rear plate and the right plate in a placement cavity provided in the base, the front plate, the left plate, the rear plate and the right plate forming a molding cavity, and then pouring the mixed raw materials into the molding cavity; B, then placing the top plate in the molding cavity, covering the molding cavity, and then hydraulically operating the top plate to pre-press the mixed raw materials to form a mixed entity with a certain strength and shape; C, taking out the front plate, the left plate, the top plate, the rear plate, the right plate and the mixed entity in the molding cavity from the base together. The purpose of the invention is to solve the problem that in order to obtain special-shaped polycrystalline diamond, the surface of the polycrystalline diamond is shaped after high-temperature and high-pressure molding, which prolongs the processing time of the polycrystalline diamond.

Description

Technical Field

[0001] The invention relates to the technical field of polycrystalline diamond processing, in particular to a processing method for special-shaped polycrystalline diamond. Background Art

[0002] Polycrystalline diamond is a material made of many tiny diamond crystals sintered through high temperature and high pressure technology. This material is famous for its excellent hardness and wear resistance and is widely used in industrial cutting, grinding and drilling. The production process of polycrystalline diamond includes raw material preparation, purification, batching, charging and ultra-high pressure and high temperature synthesis and subsequent processing, including cutting, shaping, grinding, polishing, etc., to obtain the final product.

[0003] Existing polycrystalline diamonds usually need to be formed at high temperature and high pressure, and then their surfaces need to be shaped to obtain special-shaped polycrystalline diamonds. The shaping process consumes energy and wastes materials. The most important thing is that it prolongs the processing time of polycrystalline diamonds and the process is cumbersome. Summary of the invention

[0004] The object of the present invention is to provide a method for processing shaped polycrystalline diamond to solve the problem that in order to obtain shaped polycrystalline diamond, the surface of the shaped polycrystalline diamond is reshaped after high temperature and high pressure molding, which prolongs the processing time of the polycrystalline diamond.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for processing special-shaped polycrystalline diamond includes mixing raw materials, a base, a front plate, a left plate, a rear plate, a right plate, and a top plate. The specific steps are as follows:

[0007] A. Place the front plate, left plate, rear plate and right plate in the placement cavity opened on the base. The front plate, left plate, rear plate and right plate form a molding cavity, and then pour the mixed raw materials into the molding cavity;

[0008] B. Then, the top plate is placed in the molding cavity, the molding cavity is covered, and then the top plate is hydraulically operated to pre-press the mixed raw materials to form a mixed entity with a certain strength and shape;

[0009] C. Take out the front plate, left plate, top plate, rear plate, right plate and the mixed entity in the molding cavity from the base;

[0010] D. Expand the left plate and the right plate to both sides respectively, so that the mixed entity falls out of the molding cavity;

[0011] E. Clean the mixed entity and then dry it;

[0012] F. The dried mixed entity is heated and pressurized under a high temperature and high pressure environment to form polycrystalline diamond.

[0013] Preferably, in step B, the top of the top plate is movably connected with a lifting block that can move up and down, and the top of the top plate is provided with a telescopic groove for the lifting block to move up and down. When the top plate is hydraulically pressed, the lifting block will be pressed into the telescopic groove first, and then the pressure will act on the surface of the top plate.

[0014] Preferably, the four sides of the top plate are in contact with the inner wall of the molding cavity, pre-pressing the mixed raw materials so that the mixed raw materials are transformed into the shape surrounded by the cavity bottom, the front plate, the left plate, the rear plate, the right plate and the bottom of the top plate.

[0015] Preferably, the bottom walls of the left plate and the right plate are fixedly connected with short bottom edge strips, the bottom of the placement cavity is fixedly connected with two long bottom edge strips, the inner sides of the long bottom edge strips and the short bottom edge strips are rounded, the four sides of the forming cavity are rounded, and a rounded groove is provided at the bottom of the top plate. The long bottom edge strips, the short bottom edge strips, the rounded grooves and the rounded corners of the forming cavity are used to pre-press the mixed raw materials into a mixed entity with rounded edges.

[0016] Preferably, a return spring is fixedly connected between the bottom wall of the telescopic groove and the bottom of the lifting block. When the hydraulic pressure is completed, the pressure is removed, and the lifting block automatically extends a portion from the surface of the top plate under the action of the elastic force of the return spring. In step C, the front plate, left plate, top plate, rear plate, right plate and the mixed entity in the molding cavity are taken out from the base together by clamping the lifting block and pulling it upward.

[0017] Preferably, the tops of the left plate and the right plate are movably connected with limit baffles that can move left and right. In step C, the two limit baffles are first closed toward the middle so that the two limit baffles are located above the top plate, and then the lifting block is clamped and pulled upward to drive the top plate to move upward. When the top plate contacts the limit baffle, continuing to move upward will drive the front plate, left plate, limit baffle, top plate, rear plate, and right plate to move upward, and due to the rounded corners of the short bottom edge strips, the two short bottom edge strips can hold up the mixed entity and move it upward together, thereby taking the front plate, left plate, rear plate, right plate and the mixed entity in the molding cavity out of the base.

[0018] Preferably, in step E, the mixed entity is moved to a cleaning chamber together with the front plate, left plate, top plate, rear plate and right plate, and then the top plate is moved downward to contact with the top of the mixed entity, and then the left plate and the right plate are opened to both sides respectively, and then the front plate, left plate, rear plate, right plate and top plate are taken away, and the mixed entity can be cleaned.

[0019] Preferably, the mixed raw material is selected from diamond micropowder and metal binder powder, and the raw materials are uniformly mixed, and the mass fraction of the diamond micropowder in the mixed raw material is 50%-90%.

[0020] Preferably, the particle size of the diamond powder is 10-30 μm, the metal binder powder is one of cobalt and nickel, and the high temperature and high pressure conditions are 1500° C. and 5-6 GPa.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. By pre-pressing the mixed raw materials into a certain shape, the edges of the mixed entity are rounded, eliminating the subsequent processing steps of rounding the polycrystalline diamond and reducing the processing time;

[0023] 2. By pre-pressing the mixed raw materials in the molding cavity surrounded by the front plate, the left plate, the rear plate and the right plate, it is convenient to take out the pre-pressed mixed entity from the base, which is conducive to moving the mixed entity and demoulding the mixed entity;

[0024] 3. By setting a limit baffle, when the limit baffle moves to the top of the top plate, it can limit the top plate from moving out of the molding cavity, and can also limit the rotation of the left plate and the right plate when hoisting the top plate, which is conducive to facilitating the movement and transportation of the mixed entity and preventing the mixed entity from being damaged when it is directly clamped for transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a state diagram after the hydraulic pressure in step B of the present invention is completed;

[0026] Figure 2 It is a schematic structural diagram of a cutaway portion of the base of the present invention;

[0027] Figure 3 It is a schematic structural diagram of the left plate, the limit baffle plate and the right plate of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the top plate and the lifting block of the present invention;

[0029] Figure 5 It is a state diagram of the front plate, the left plate, the top plate, the rear plate, and the right plate in step C of the present invention;

[0030] Figure 6 This is a state diagram of the left plate and the right plate being unfolded to both sides respectively in step D of the present invention.

[0031] In the figure: 1. base; 2. placement cavity; 3. long bottom edge strip; 4. front plate; 5. left plate; 6. short bottom edge strip; 7. T-shaped slider; 8. T-shaped slide groove; 9. limit baffle; 10. top plate; 11. rounded groove; 12. telescopic groove; 13. reset spring; 14. lifting block; 15. clamping groove; 16. limit slider; 17. limit slide groove; 18. back plate; 19. right plate. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 6 , the present invention provides a technical solution:

[0034] A method for processing special-shaped polycrystalline diamond includes mixing raw materials, a base 1, a front plate 4, a left plate 5, a rear plate 18, a right plate 19, and a top plate 10, and the specific steps are as follows:

[0035] A. Place the front plate 4, the left plate 5, the rear plate 18, and the right plate 19 in the placement cavity 2 opened in the base 1. The front plate 4, the left plate 5, the rear plate 18, and the right plate 19 form a molding cavity, and then pour the mixed raw materials into the molding cavity;

[0036] Furthermore, the front plate 4 and the rear plate 18 are symmetrically arranged front to back, the left plate 5 and the right plate 19 are symmetrically arranged left to right, and a first rotating rod is arranged at the edge line of the left top of the left plate 5, and the front and rear ends of the first rotating rod are respectively rotatably connected to the front plate 4 and the rear plate 18, and a second rotating rod is arranged at the edge line of the right top of the right plate 19, and the front and rear ends of the second rotating rod are respectively rotatably connected to the front plate 4 and the rear plate 18, and the rear wall of the front plate 4, the right wall of the left plate 5, the front wall of the rear plate 18, and the left wall of the right plate 19 form a molding cavity.

[0037] B. Then, the top plate 10 is placed in the molding cavity, the molding cavity is covered, and then the top plate 10 is hydraulically operated to pre-press the mixed raw materials to form a mixed entity with a certain strength and shape;

[0038] Furthermore, the four sides of the top plate 10 are in contact with the inner wall of the molding cavity, and the top plate 10 can be hydraulically pressed by a hydraulic press to pre-press the mixed raw materials so that the mixed raw materials are formed into a shape surrounded by the bottom of the cavity 2, the front plate 4, the left plate 5, the rear plate 18, the right plate 19 and the bottom of the top plate 10;

[0039] Furthermore, the bottom walls of the left plate 5 and the right plate 19 are fixedly connected with short bottom side strips 6, and the two short bottom side strips 6 are symmetrically arranged, and the bottom of the groove where the cavity 2 is placed is fixedly connected with two long bottom side strips 3, and the two long bottom side strips 3 are symmetrically arranged, and the top ends of the two long bottom side strips 3 are respectively located directly below the bottom of the front plate 4 and the rear plate 18, and the bottom of the front plate 4, the bottom of the rear plate 18, and the top ends of the long bottom side strips 3 are the same size;

[0040] Furthermore, the inner sides of the long bottom edge strip 3 and the short bottom edge strip 6 are rounded, and a rounded groove 11 is provided at the bottom of the top plate 10. By setting the long bottom edge strip 3, the short bottom edge strip 6, the rounded groove 11, and the rounded corners of the molding cavity, the edge lines of the pre-pressed mixed entity are rounded, thereby eliminating the subsequent processing steps of rounding the polycrystalline diamond and reducing the processing time.

[0041] C. Take out the front plate 4, the left plate 5, the top plate 10, the rear plate 18, the right plate 19 and the mixed entity in the molding cavity from the base 1;

[0042] Furthermore, the tops of the left plate 5 and the right plate 19 are both movably connected with a limit baffle 9 that can move left and right, and the top of the top plate 10 is movably connected with a lifting block 14 that can move up and down, and the two limit baffles 9 are closed toward the middle so that the two limit baffles 9 are partially located above the top plate 10, and then the lifting block 14 is pulled upward to drive the top plate 10 to move upward. When the top plate 10 contacts the limit baffle 9, continuing to move upward will drive the front plate 4, the left plate 5, the rear plate 18, and the right plate 19 to move upward, and due to the rounded corners of the short bottom edge strips 6, the two short bottom edge strips 6 can hold up the mixed entity and move it upward together, so that the front plate 4, the left plate 5, the top plate 10, the rear plate 18, the right plate 19 and the mixed entity in the molding cavity are taken out from the base 1;

[0043] Furthermore, the tops of the left plate 5 and the right plate 19 are fixedly connected with a T-shaped slider 7, and the bottom of the limit baffle 9 is provided with a T-shaped slide groove 8 for the T-shaped slider 7 to slide. By pushing the limit baffle 9 left and right, the T-shaped slider 7 moves along the track of the T-shaped slide groove 8, so that the limit baffle 9 moves left and right on the top of the left plate 5 and the right plate 19. When a part of the limit baffle 9 is located at the top of the top plate 10, the top plate 10 can be restricted from moving out of the molding cavity.

[0044] Furthermore, a telescopic groove 12 is provided at the top of the top plate 10 for the lifting block 14 to move up and down, and a return spring 13 is fixedly connected to the bottom wall of the telescopic groove 12. The top of the return spring 13 is fixedly connected to the bottom of the lifting block 14. The top surface of the lifting block 14 is smaller than the contact surface of the hydraulic press rod. When the hydraulic press presses the top plate 10, the lifting block 14 is first pressed into the telescopic groove 12, and then the rod still has an area in contact with the surface of the top plate 10. At this time, the force of the rod will act on the surface of the top plate 10, and will not cause damage to the return spring 13. When the hydraulic rod is removed, the lifting block 14 is ejected from the telescopic groove 12 under the action of the elastic force of the return spring 13.

[0045] Furthermore, both ends of the lifting block 14 are fixedly connected to the limit slide block 16, and the side wall of the telescopic slot 12 is provided with a limit slide groove 17 for the limit slide block 16 to move up and down. By setting the limit slide block 16 to move in the limit slide groove 17, when the lifting block 14 is pulled, the lifting block 14 can be prevented from moving out of the telescopic slot 12;

[0046] Furthermore, clamping grooves 15 are symmetrically provided on both sides of the lifting block 14 . The clamping grooves 15 are provided to facilitate a clamp to clamp the lifting block 14 , and then to facilitate pulling the lifting block 14 upward.

[0047] D. Expand the left plate 5 and the right plate 19 to both sides respectively, so that the mixed solid falls out of the molding cavity;

[0048] Furthermore, with the full-automatic clamping robot arm, the taken-out front plate 4, left plate 5, rear plate 18, right plate 19 and mixed entity are moved to the cleaning room for placement. During the moving process, please refer to the left plate 5 in the figure. The top plate 10 will be pulled and contacted with the limit baffle 9. Because the top plate 10 is in contact with the limit baffle 9, the rotation of the left plate 5 and the right plate 19 is restricted. Therefore, during the movement, the short bottom edge strip 6 will always hold the mixed entity so that it will not fall. After being moved into the cleaning room, please refer to Figure 6 , use the robot arm to move the top plate 10 downward so that the top plate 10 drops to contact with the top of the mixed entity. At this time, the limit baffle 9 and the top plate 10 are away from each other, and the bottoms of the two short bottom edge strips 6 have slots for clamping by the fully automatic clamping robot arm. Then, the two fully automatic clamping robot arms can be used to clamp the bottoms of the left plate 5 and the right plate 19 respectively, and open them to both sides. Then, the three fully automatic clamping robot arms are moved upward to lift the front plate 4, the left plate 5, the rear plate 18, the right plate 19, and the top plate 10 away from the mixed entity, which is conducive to the automatic movement of the mixed entity and the demoulding of the mixed entity, reducing the steps of manual operation and reducing the risk factor during polycrystalline diamond processing.

[0049] E. Clean the mixed entity and then dry it;

[0050] Furthermore, the front plate 4, the left plate 5, the rear plate 18, the right plate 19, and the top plate 10 can also be cleaned at the same time to ensure the quality of the next pre-pressing. An ultrasonic cleaning machine can be used to clean the front plate 4, the left plate 5, the rear plate 18, the right plate 19, the top plate 10, and the mixed entity. The cleaned mixed entity can be dried by blowing hot air.

[0051] F. heating and pressurizing the dried mixed entity under a high temperature and high pressure environment to form polycrystalline diamond;

[0052] Furthermore, the mixed entity is heated and pressurized by a six-sided top press. Specifically, the dried mixed entity is placed in a graphite mold, and then the graphite mold containing the mixed entity is placed in a pyrophyllite block on the six-sided top press as a pressure transmission medium.

[0053] Furthermore, the mixed raw materials are selected from diamond micropowder and metal binder powder, and the raw materials are uniformly mixed, and the mass fraction of the diamond micropowder in the mixed raw materials is 50%-90%.

[0054] Furthermore, the particle size of the diamond powder is 10-30 μm, the metal binder powder is one of cobalt and nickel, the high temperature condition is 1500° C., and the high pressure is adjusted to 5-6 GPa.

[0055] The specific scheme is as follows: the front plate 4, the left plate 5, the rear plate 18, and the right plate 19 are placed in the placement cavity 2 of the base 1, and the long bottom edge strip 3 is aligned with the front plate 4 and the rear plate 18, and the uniformly mixed diamond powder and metal binder powder are poured into the molding cavity, and then the top plate 10 is placed in the molding cavity, and the molding cavity is covered, and the top plate 10 is hydraulically pressed by a hydraulic press, and the hydraulic rod on the hydraulic press first contacts the lifting block 14, and presses the lifting block 14 into the telescopic groove 12 until the upper surface of the lifting block 14 is flush with the upper surface of the top plate 10, and then the hydraulic rod contacts the top plate 10 and presses the top plate 10 downward, so that the mixed raw materials in the molding cavity are die-cast into a mold that fits the base 1, the long bottom edge strip 3, and the front plate 4. , left plate 5, short bottom edge strip 6, top plate 10, rear plate 18, and the shape of the inner wall of the right plate 19. After die-casting, remove the hydraulic rod, and the lifting block 14 extends out of the telescopic slot 12 under the elastic force of the reset spring 13, so that the limit slider 16 moves upward along the track of the limit slide slot 17, and then use the first fully automatic clamping robot arm to clamp the lifting block 14 by embedding the clamping end into the clamping slot 15, and then push the two limit baffles 9 to close, so that the T-shaped slider 7 moves along the track of the T-shaped slide slot 8 until a part of the two limit baffles 9 moves to the top of the top plate 10, and then use the robot arm to lift the top plate 10 upward. When the top plate 10 contacts the limit baffle 9, it will drive the front plate 4, left plate 5, and short bottom edge strip 6 to move upward. The side strip 6, the rear plate 18, the right plate 19, and the mixed entity move upward together until they are removed from the placement chamber 2, and then move into the cleaning chamber, and use the first fully automatic clamping robot arm to move the top plate 10 downward until the top plate 10 drops to contact the top of the mixed entity. At this time, the limit baffle 9 and the top plate 10 are separated from each other, and the second and third fully automatic clamping robots are used to clamp the bottom of the left plate 5 and the right plate 19 respectively, and open them to both sides, and then use the three fully automatic clamping robots to move upward, lift the front plate 4, the left plate 5, the short bottom side strip 6, the rear plate 18, the right plate 19, and the top plate 10 away from the mixed entity, and then use the ultrasonic cleaning machine to clean the mixed entity and the front plate 4, the left plate 5 , short bottom edge strip 6, rear plate 18, right plate 19, and top plate 10 are cleaned, and after cleaning, hot air is blown into the cleaning room to dry the mixed entity and the front plate 4, left plate 5, short bottom edge strip 6, rear plate 18, right plate 19, and top plate 10. After drying, the front plate 4, left plate 5, short bottom edge strip 6, rear plate 18, right plate 19, and top plate 10 are driven by a mechanical arm to wrap the mixed entity, and then the mixed entity is moved to a graphite mold in a pyrophyllite block installed on a six-sided top press as a pressure transmission medium, and then the front plate 4, left plate 5, short bottom edge strip 6, rear plate 18, right plate 19, and top plate 10 are removed by a mechanical arm, and the mixed entity is heated and pressurized by a six-sided top press to form polycrystalline diamond.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for processing a special-shaped polycrystalline diamond, comprising a mixed raw material, a base (1), a front plate (4), a left plate (5), a rear plate (18), a right plate (19), and a top plate (10), characterized in that: The specific steps are as follows: A. placing the front plate (4), the left plate (5), the rear plate (18), and the right plate (19) in a placement cavity (2) provided in the base (1), so that the front plate (4), the left plate (5), the rear plate (18), and the right plate (19) form a molding cavity, and then pouring the mixed raw materials into the molding cavity; B. Then, the top plate (10) is placed in the molding cavity, the molding cavity is covered, and then the top plate (10) is hydraulically operated to pre-press the mixed raw materials to form a mixed entity with a certain strength and shape; C. Take out the front plate (4), the left plate (5), the top plate (10), the rear plate (18), the right plate (19) and the mixed solid in the molding cavity from the base (1); D. Expand the left plate (5) and the right plate (19) to both sides respectively, so that the mixed solid falls out of the molding cavity; E. Clean the mixed entity and then dry it; F. heating and pressurizing the dried mixed entity under a high temperature and high pressure environment to form polycrystalline diamond; In step B, a lifting block (14) that can move up and down is movably connected to the top of the top plate (10), and a telescopic groove (12) is provided on the top of the top plate (10) for the lifting block (14) to move up and down. When the top plate (10) is hydraulically pressed, the lifting block (14) is first pressed into the telescopic groove (12), and then the pressure acts on the surface of the top plate (10); The top plate (10) is fitted around the inner wall of the molding cavity to pre-press the mixed raw material so that the mixed raw material is formed into a shape surrounded by the bottom of the cavity (2), the front plate (4), the left plate (5), the rear plate (18), the right plate (19) and the bottom of the top plate (10); The bottom walls of the left plate (5) and the right plate (19) are fixedly connected with short bottom edge strips (6); the bottom of the placement cavity (2) is fixedly connected with two long bottom edge strips (3); the inner sides of the long bottom edge strips (3) and the short bottom edge strips (6) are rounded; the four sides of the molding cavity are rounded; a rounded groove (11) is provided at the bottom of the top plate (10); and the mixed raw materials are pre-pressed into a mixed entity with a rounded edge by using the long bottom edge strips (3), the short bottom edge strips (6), the rounded groove (11), and the rounded corners of the molding cavity; A return spring (13) is fixedly connected between the bottom wall of the telescopic groove (12) and the bottom of the lifting block (14). When the hydraulic pressure is completed, the pressure is removed, and the lifting block (14) automatically extends a portion from the surface of the top plate (10) under the action of the elastic force of the return spring (13). In step C, the front plate (4), the left plate (5), the top plate (10), the rear plate (18), the right plate (19) and the mixed entity in the molding cavity are taken out from the base (1) together by clamping the lifting block (14) and pulling it upward; The tops of the left plate (5) and the right plate (19) are both movably connected with a limit baffle (9) that can move left and right. In step C, the two limit baffles (9) are first closed toward the middle so that the two limit baffles (9) are located above the top plate (10), and then the lifting block (14) is clamped and pulled upward to drive the top plate (10) to move upward. When the top plate (10) contacts the limit baffle (9), it continues to move upward to drive the front plate (4), the left plate (5), the limit baffle (9), the top plate (10), the rear plate (18), and the right plate (19) to move upward. Due to the rounded corners of the short bottom edge strips (6), the two short bottom edge strips (6) can lift the mixed entity and move it upward together, thereby taking the front plate (4), the left plate (5), the rear plate (18), the right plate (19) and the mixed entity in the molding cavity out of the base (1); In step E, the mixed entity together with the front plate (4), the left plate (5), the top plate (10), the rear plate (18), and the right plate (19) are moved to the cleaning chamber, and then the top plate (10) is moved downward to contact the top of the mixed entity, and then the left plate (5) and the right plate (19) are opened to both sides respectively, and then the front plate (4), the left plate (5), the rear plate (18), the right plate (19), and the top plate (10) are removed, and the mixed entity can be cleaned.

2. The method for processing special-shaped polycrystalline diamond according to claim 1, characterized in that: Diamond micro powder and metal binder powder are selected as the mixed raw materials, and the raw materials are uniformly mixed. The mass fraction of diamond micro powder in the mixed raw materials is 50% - 90%.

3. The method for processing special-shaped polycrystalline diamond according to claim 1, characterized in that: The particle size of diamond micro powder is 10-30μm, the metal binder powder is one of cobalt and nickel, and the high temperature and high pressure conditions are 1500℃ and 5-6GPa.

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