A method and device for removing a material cup from a polycrystalline diamond compact

Abstract

The present application relates to the technical field of polycrystalline diamond compact processing, and particularly relates to a diamond compact material cup removing processing method and device. The diamond compact material cup removing processing device comprises a protective cover, the protective cover has an end face covering part for covering the end face of the external material cup of the diamond compact, and a through hole is arranged on the end face covering part so that the edge part of the material cup is covered and only the central area of the end face is exposed. The diamond compact material cup removing processing method covers the external material cup of the diamond compact by the protective cover, exposes the central area of the end face of the diamond compact through the through hole on the end face of the protective cover, then performs sand blasting processing on the central area of the end face of the material cup, removes the material cup in the central area, exposes the end face of the central area of the diamond layer, and finally grinds the edge part of the material cup, removes the material cup in the edge part, and exposes the end face of the edge part of the diamond layer.

Description

Technical Field

[0001] This invention relates to the field of polycrystalline diamond composite sheet processing technology, specifically to a method and apparatus for removing the material cup from a diamond composite sheet. Background Technology

[0002] Polycrystalline diamond compact (PDC) is a high-performance composite superhard material formed by sintering micron-sized diamond particles onto a cemented carbide matrix. The finished PDC retains the high hardness, high heat resistance, and corrosion resistance of diamond particles while also possessing weldability comparable to that of cemented carbide, making it an ideal material for manufacturing cutting tools, drilling bits, and other wear-resistant tools.

[0003] Existing polycrystalline diamond composite sheet structures consist of an upper diamond layer and a lower cemented carbide matrix. These two completely different materials are processed using high-temperature sintering combined with press rolling. During the sintering process, both the diamond layer and the cemented carbide matrix layer need to be added to a reaction vessel. This reaction vessel is typically a cylindrical or cylindrical cup with a lid at one end. During sintering, the lid is first opened, and then the cemented carbide matrix is ​​added into the inner cavity. Diamond powder is then added on top of the cemented carbide matrix, followed by the reactants for the sintering reaction. The lid is then closed, and sintering and press rolling are performed. After sintering and pressurization, the desired polycrystalline diamond composite sheet blank is obtained. After sintering and rolling, the composite sheet blank needs further processing. The cup attached to the diamond layer is removed, exposing the end face of the diamond layer, thus completing the processing of the polycrystalline diamond composite sheet.

[0004] However, removing the feed cup from diamond composite sheet blanks remains a significant challenge. The common practice is to use a specialized grinding machine to shape the outer periphery of the blank and grind the end face containing the diamond layer to remove the feed cup outside the top surface of the diamond layer, exposing the top surface. However, due to high-temperature consolidation and press rolling, edge compression and wrinkling cause the thickness of the feed cup's edge to be greater than the central area. Therefore, during grinding, the thicker edge area must be ground away first before grinding the rest of the feed cup, including the central area, resulting in excessively long grinding times and low processing efficiency for diamond composite sheets. To address the low efficiency of grinding machines, another existing technology involves sandblasting the composite sheet blank to directly remove the feed cup outside the diamond composite layer. This significantly improves processing efficiency. Sandblasting typically uses high-pressure white corundum.

[0005] However, there is a problem with sandblasting diamond composite sheets: due to stress concentration and other reasons, the edge of the sandblasted surface of the composite sheet blank will also have edge missing during the sandblasting process, causing damage or pitting on the edge of the diamond layer under the cup, which will affect the subsequent use of the polycrystalline diamond composite sheet. Summary of the Invention

[0006] The purpose of this invention is to provide a method for removing the material cup from a diamond composite sheet, thereby solving the technical problem in the prior art where the edge of the diamond layer is easily missing when the material cup on the composite sheet blank is removed by sandblasting, which affects the subsequent use of the diamond blank. In addition, the purpose of this invention is also to provide a device for removing the material cup from a diamond composite sheet, so that the central area of ​​the top of the material cup of the diamond composite sheet blank is exposed and the edge area is covered during sandblasting.

[0007] To achieve the above objectives, the technical solution of the diamond composite sheet cup removal processing method provided by the present invention is as follows:

[0008] A method for removing the material cup from a diamond composite sheet involves using a protective cover to shield the material cup outside the diamond composite sheet. Through a through hole on the end face of the protective cover, the edge of the material cup is covered while only the central area of ​​the end face is exposed. Then, the central area of ​​the end face of the material cup is sandblasted to remove the material cup in the central area, exposing the end face of the central area of ​​the diamond layer. Finally, the protective cover is removed, and the edge of the material cup is ground to remove the material cup at the edge, exposing the end face of the edge part of the diamond layer.

[0009] Beneficial Effects: This invention addresses the problems existing in the removal of the cup from the outer surface of a diamond composite sheet in the prior art. It proposes a novel method for removing the cup from a diamond composite sheet. This method uses a protective cover to shield the edge of the cup while exposing the central area of ​​the cup's end face. This allows for sandblasting of the central area of ​​the cup outside the diamond layer. The central portion of the cup can be directly removed during sandblasting without affecting the edge of the diamond layer, preventing edge loss due to sandblasting. After sandblasting, the protective cover can be removed, and only the edge of the cup outside the diamond layer needs to be ground off. This significantly reduces the time spent on overall grinding, lowers the grinding difficulty, improves the efficiency of removing the cup outside the diamond layer, and prevents edge loss of the diamond layer, ensuring the integrity of the diamond layer after cup removal. This effectively solves the technical problem in the prior art where sandblasting removal of the cup from the composite sheet blank easily results in edge loss of the diamond layer, affecting the subsequent use of the diamond composite sheet.

[0010] Preferably, after removing the protective cover and before grinding the edge of the cup, the two end faces of the cup are first ground flat. Grinding the two end faces of the cup first allows the diamond composite layer to be laid flat and aligned, facilitating the subsequent grinding of the outer cup of the diamond layer.

[0011] Preferably, a grinding machine is used to grind the edge of the material cup, with a pressure of 0.3-0.8 MPa and a rotation speed of 20-50 r / min during grinding. Using a grinding machine saves manpower, is easy to control, and improves grinding efficiency.

[0012] Preferably, a grinding mill is used to grind the edge of the material cup, with diamond single-crystal particles added as abrasive during grinding. The diamond single-crystal particles enhance the grinding effect, ensuring that the entire material cup is ground away, thus further improving grinding efficiency.

[0013] The technical solution of the diamond composite sheet cup removal processing device provided by the present invention is as follows:

[0014] A diamond composite sheet cup removal processing device includes a protective cover. The protective cover has an end face covering portion for covering the end face of the outer cup of the diamond composite sheet. The end face covering portion is provided with a through hole so that the edge portion of the cup is covered while only the central area of ​​the end face is exposed, thereby facilitating sandblasting processing of the central area of ​​the end face of the cup.

[0015] Beneficial effects: The diamond composite cup removal processing device of the present invention, by setting a protective cover, can cover the end face of the outer cup of the diamond composite layer through the end face of the protective cover, protect the edge of the diamond composite layer and prevent the edge from being missing due to sandblasting. The through hole on the protective cover can expose the central area of ​​the cup end face. Without affecting the edge of the diamond composite layer, the cup corresponding to the central part of the diamond composite layer and the through hole can be quickly sandblasted away. Then, the diamond composite sheet with the cup in the central area removed can be ground, improving processing efficiency and shortening processing time.

[0016] Preferably, the protective cover is a plate-like structure, including a cover plate for covering the material cup. The protective cover also includes an elastic pad fixed to one side of the cover plate and used for placement between the cover plate and the material cup. The through hole is provided in the cover plate and the elastic pad. By making the protective cover a plate-like structure, the coverage area of ​​the material cup can be increased, and the through hole can be directly machined on the surface of the cover plate for convenience and speed. By providing an elastic pad between the cover plate and the material cup, the elastic pad can press the uneven top surface of the material cup after rolling, ensuring a tight seal and preventing sand leakage or waste accumulation at the top of the material cup.

[0017] Preferably, the protective cover further includes a counterweight plate fixed to the other side of the cover plate, with the through hole penetrating the counterweight plate. The counterweight plate can press the cover plate firmly against the top of the cup, ensuring the reliability and stability of the protective cover during use.

[0018] Preferably, each of the two surfaces of the cover plate is provided with a fixing groove for fixing and assembling the elastic pad and the counterweight plate, respectively. The fixing grooves on the two surfaces of the cover plate allow the elastic pad and the counterweight plate to be fixedly installed within the mounting grooves, ensuring the assembly stability of the components inside the protective cover.

[0019] Preferably, the diamond composite sheet cup removal processing device further includes a base, on which at least one mounting groove is provided for mounting the diamond composite sheet along with its external cup. The base and the mounting groove on it enable the diamond composite sheet to be positioned correctly, preventing circumferential displacement.

[0020] Preferably, the protective cover is a cup-shaped structure for inverting onto the outside of the material cup. The bottom of the protective cover has a through hole for exposing the central area of ​​the material cup's end face. The protective cover also includes a cup body for covering the circumferential surface of the material cup surrounding the diamond composite sheet, forming the circumferential covering portion of the material cup. By designing the protective cover as a cup-shaped structure, the material cup can be directly covered by inverting the cup-shaped protective cover. The inverted protective cover is stable on the outside of the material cup, the cup opening supports the protective cover, and the circumferential covering portion also covers and protects the circumferential surface of the material cup surrounding the diamond composite sheet. This ensures that only the central area of ​​the material cup's end face is sandblasted during sandblasting, avoiding impact on other areas of the diamond composite sheet. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the diamond composite sheet removal and processing device in Embodiment 1 of the present invention;

[0022] Figure 2 for Figure 1 A top view of the diamond composite sheet removal cup processing device in the middle;

[0023] Figure 3 for Figure 1 A magnified view of the selected area within the box.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Protective cover; 2. Base; 3. Diamond composite sheet blank; 4. Mounting groove; 5. Through hole; 6. Cover plate; 7. Counterweight plate; 8. Elastic pad; 9. Fixing groove. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to embodiments.

[0027] Specific embodiment 1 of the diamond composite sheet cup removal processing device provided by the present invention:

[0028] The diamond composite sheet cup removal processing device in this embodiment is used to arrange and position the composite sheet and cover and protect the outer edge of the diamond layer of the diamond composite sheet when removing the cups on the diamond composite sheet. The processing device includes a horizontally laid base with multiple mounting slots for mounting the diamond composite sheet. The processing device also includes a protective cover that presses on the base to cover the cups on the top surface of each diamond composite sheet. The protective cover has through holes for exposing the central area of ​​the top surface of the cup.

[0029] Specifically, such as Figures 1 to 3 As shown, base 2 is a horizontally extending flat plate structure, with... Figure 2 For example, the base 2 has fifteen spaced mounting slots 4. Each mounting slot 4 is a circular groove for placing the diamond composite blank 3 after rolling and sintering to limit its circumferential movement. The protective cover 1 is fastened to the base 2, completely covering the base 2. At the same time, the protective cover 1 has through holes 5 that correspond one-to-one with the mounting slots 4 on the base 2. After the protective cover 1 presses the composite blank, the through holes 5 cover the edge of the material cup while only the central area of ​​the end face is exposed.

[0030] like Figure 3 As shown, the protective cover 1 in this embodiment is a fixedly connected three-layer plate structure, including a middle cover plate 6, an elastic pad 8 located at the lower end of the cover plate 6 between the cover plate 6 and the material cup, and a counterweight plate 7 located at the top of the cover plate 6. In this embodiment, the cover plate 6, the elastic pad 8, and the counterweight plate 7 are all rectangular plate structures, thus covering the base 2 after being fixedly connected to form the protective cover 1. Figure 3 As shown, to ensure a stable connection between the three layers, the upper and lower surfaces of the cover plate 6 in this embodiment are provided with fixing grooves 9 for pressing and fixing the elastic pad 8 and the counterweight block. The fixing grooves 9 have the same depth and area, and the depth of the fixing grooves 9 matches the thickness of the counterweight plate 7 and the elastic pad 8. The elastic pad 8 and the counterweight block are embedded in the fixing grooves 9, allowing for timely disassembly and replacement after prolonged sandblasting. In this embodiment, the counterweight plate 7 is made of materials including but not limited to steel and hard alloy to ensure the top pressure effect and facilitate periodic replacement. The elastic pad 8 is made of materials including but not limited to rubber.

[0031] like Figure 3As shown, after the three-layer plate body is assembled to form the protective cover 1, through holes 5 are provided on the protective cover 1, corresponding one-to-one with the mounting grooves 4 on the base 2. This allows the central area of ​​the top cup of the diamond composite sheet to be exposed after the protective cover 1 is fastened. That is, in this embodiment, each of the three layers of the protective cover 1 is provided with fifteen interconnected through holes 5, and the plate surface of the protective cover 1 constitutes the end face covering part used to cover the end face of the outer cup of the diamond composite sheet. Of course, in other embodiments, through holes can be opened on each layer of the plate body first, and then the protective cover can be assembled.

[0032] In this embodiment, the diamond composite cup removal processing device, by setting a protective cover 1, can cover the end face of the outer cup of the diamond composite layer through the end face covering part of the protective cover 1, protect the edge part of the diamond composite layer, and prevent the edge part from being missing due to sandblasting. The through hole 5 on the protective cover 1 can expose the central area of ​​the cup end face. Without affecting the edge of the diamond composite layer, the cup corresponding to the central part of the diamond composite layer and the through hole 5 is quickly sandblasted away. Then, the diamond composite sheet with the cup in the central area removed can be ground, which improves processing efficiency and shortens processing time.

[0033] Specific embodiment 2 of the diamond composite sheet removal and processing device provided by the present invention:

[0034] In this invention, the structure of the elastic pad can be modified. Unlike Embodiment 1, in this embodiment, the elastic pad is fixed below the cover plate but only matches the size of the diamond composite sheet; that is, fifteen elastic pads corresponding to the mounting grooves on the base are arranged at intervals below the cover plate. In other embodiments, the elastic pad can also be a strip or a band structure. In other different embodiments, the material of the elastic pad can also be changed, for example, replaced with silicone, plastic, or other elastic structures. Alternatively, in extreme cases of other different embodiments, the elastic pad can be omitted.

[0035] Specific embodiment 3 of the diamond composite sheet removal and processing device provided by the present invention:

[0036] In this invention, the structure of the counterweight plate 7 can be modified. The difference from Embodiment 1 is that, in this embodiment, the structure and size of the counterweight plate can be changed to be smaller than the cover plate, and its shape can also be a circular plate or a frame-shaped structural plate with a perforated groove. In other embodiments, the counterweight plate can be omitted, or the cover plate and the counterweight plate can be integrally formed.

[0037] Specific embodiment 4 of the diamond composite sheet removal and processing device provided by the present invention:

[0038] In this invention, the structure and assembly form of the protective cover can be modified. The difference from Embodiment 1 is that in this embodiment, the elastic pad and counterweight plate are adhered to the fixing groove on the cover plate. In other embodiments, fasteners, locks, or pins and screws can also be used to fix the three-layer plate structure together. Of course, the fixing groove on the protective cover can also be omitted, and the three-layer plate structure can be directly fixed using the aforementioned fixing methods.

[0039] Specific embodiment 5 of the diamond composite sheet removal and processing device provided by the present invention:

[0040] In this invention, the number of feeding cups on the base can be changed. The difference from Embodiment 1 is that in this embodiment, the number of mounting slots on the base is set to a number other than 15, which can be increased or decreased according to actual conditions, but at least one mounting slot must be ensured.

[0041] Specific embodiment 6 of the diamond composite sheet removal and processing device provided by the present invention:

[0042] In this invention, the structure of the protective cover can also be modified. The difference from Embodiment 1 is that, in this embodiment, the protective cover is a cup-shaped structure for inverting onto the base and located outside the material cup. The bottom of the cup has a through hole that exposes the central area of ​​the material cup's end face. The cup body of the protective cover covers the circumferential surface of the material cup outside the diamond composite sheet, forming the circumferential surface covering portion of the material cup. The cup-shaped protective cover is a cylindrical structure with one open end and a through hole at the bottom of the other end. In other embodiments, the protective cover can also be a frustum-shaped structure or a trapezoidal structure with one open end.

[0043] The present invention employs the diamond composite sheet cup removal processing device in the above embodiments to perform the removal process of the outer cup of the diamond composite sheet. Before performing the cup removal process, it is necessary to obtain a composite sheet blank with the cup externally fixed. The processing method of the composite sheet blank is the same as the processing method of diamond composite sheets in the prior art. The specific processing method is as follows:

[0044] The alloy matrix and diamond powder are sequentially loaded into a metal cup, and then the binder and other reactants required for sintering are added. After that, a high-temperature heating device is used with the aid of a press to sinter and roll the cup at high temperature. After sintering and rolling, a composite blank with the metal cup on the outer surface is obtained.

[0045] Example 1 of the diamond composite sheet cup removal processing method provided by the present invention:

[0046] A method for removing the material cup from a diamond composite sheet, using the diamond composite sheet material cup removal processing device described in the above embodiments to remove the material cup outside the diamond layer of the composite sheet blank, thereby exposing the diamond layer of the diamond composite sheet, includes the following steps:

[0047] (1) The composite blank is placed into the mounting slot on the base of the processing device, with the alloy matrix of the composite blank at the bottom and the diamond layer at the top. Then, a protective cover is used to cover the composite blank. The protective cover blocks the outer edge of the top of the diamond layer, and the through hole on the protective cover exposes the center area of ​​the top surface of the material cup facing upward.

[0048] (2) Use a sandblasting machine to sandblast the exposed area of ​​the top center of the composite sheet blank in the through hole of the protective cover. The sandblasting machine uses a blade with a diameter of 58mm to remove the circular area with a diameter of 30-40mm in the center of the top surface of the blank, so that the diamond layer in the circular area of ​​the top surface of the blank is exposed.

[0049] (3) After sandblasting, the composite blank is removed from the base. The two end faces of the material cup are first ground on both sides with a grinding machine to make the two end faces of the material cup flat and make the height of each diamond composite sheet uniform. Then, the diamond layer of the composite blank is arranged with the diamond layer facing down. The remaining material cup on the outer edge of the diamond layer end face of the composite blank is ground on one side to remove the material cup on the outer edge of the diamond layer end face and obtain the required diamond composite sheet, thus achieving the purpose of removing the material cup of the diamond composite sheet.

[0050] In step (3), when performing double-sided grinding of the cups, 35 pieces are used per batch; when performing single-sided grinding to remove the cups, abrasive is added for auxiliary grinding. The abrasive is 170 / 200 mm diameter, 25 CT diamond single crystal particles. A grinding machine is used to grind the remaining cups outside the diamond layer edge. The grinding machine is pressurized at 0.3-0.8 MPa and rotates at 20-50 r / min. The grinding time for the cups is 2-4 hours. In other embodiments, the number of pieces processed per batch can be increased or decreased when performing double-sided grinding of the cups.

[0051] The processing method in this embodiment covers the edge of the material cup with a protective cover while exposing the central area of ​​the material cup end face. This allows for sandblasting of the central area of ​​the material cup outside the diamond layer. The central part of the material cup can be directly removed during sandblasting without affecting the edge of the diamond layer, and there will be no edge loss due to sandblasting. After sandblasting, the protective cover can be removed. At this point, only the edge of the material cup outside the diamond layer needs to be ground off. This greatly reduces the time spent on overall grinding, lowers the grinding difficulty, improves the efficiency of removing the material cup outside the diamond layer, and prevents the occurrence of edge loss of the diamond layer. It ensures the integrity of the diamond layer after the material cup is removed, effectively solving the technical problem in the prior art that edge loss of the diamond layer and the impact on the subsequent use of the diamond composite sheet are easily caused when sandblasting is used to remove the material cup on the diamond composite sheet.

[0052] Example 2 of the diamond composite sheet cup removal processing method provided by the present invention:

[0053] The difference from Example 1 is that in this example, before grinding the edge of the cup, it is not necessary to grind the two end faces of the cup flat; the edge of the cup can be ground directly.

[0054] Example 3 of the diamond composite sheet cup removal processing method provided by the present invention:

[0055] The difference from Example 1 is that in this example, the parameters and speed of the grinder can be adjusted as long as the grinding efficiency can be improved and the grinding requirements can be met.

[0056] Example 4 of the diamond composite sheet cup removal processing method provided by the present invention:

[0057] The difference from Example 1 is that in this example, the abrasive can also be diamond single crystal particles of other particle sizes and diameters, such as grinding particles of diamond single crystal particles with a particle size of not less than 170 / 200 and a particle size of not less than 25CT per piece.

[0058] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of removing a table of a diamond compact, characterized by, The protective cover (1) is used to cover the material cup outside the diamond composite sheet, the through hole (5) on the end face of the protective cover (1) is used to make the edge part of the material cup be covered and only the center area of the end face be exposed, then the center area of the end face of the material cup is sandblasted to remove the material cup in the center area and expose the end face of the diamond layer in the center area, finally the protective cover (1) is removed, the two end faces of the material cup are ground flat, then the edge part of the material cup is ground to remove the material cup in the edge part and expose the end face of the diamond layer in the edge part.

2. The method of claim 1, wherein, The edge part of the material cup is ground by the grinding machine, the pressure is 0.3-0.8MPA and the rotating speed is 20-50r / min.

3. The method of claim 1, wherein, The edge part of the material cup is ground by the grinding machine, and the diamond single crystal particles are added as the abrasive during the grinding.

4. A diamond compact material cup removal processing apparatus for implementing the diamond compact material cup removal processing method according to claim 1, characterized by, The protective cover (1) has an end face covering part for covering the end face of the material cup outside the diamond composite sheet, the through hole (5) is arranged on the end face covering part to make the edge part of the material cup be covered and only the center area of the end face be exposed, so as to facilitate the sandblasting of the center area of the end face of the material cup.

5. The apparatus according to claim 4, wherein The protective cover (1) is a plate structure, including a cover plate (6) for covering the material cup, the protective cover (1) further includes an elastic pad (8) fixed on one side of the cover plate (6) and arranged between the cover plate (6) and the material cup, and the through hole (5) is arranged on the cover plate (6) and the elastic pad (8).

6. The apparatus according to claim 5, wherein The protective cover (1) further includes a counterweight pressing plate (7) fixed on the other side of the cover plate (6), and the through hole (5) penetrates the counterweight pressing plate (7).

7. The apparatus according to claim 6, wherein The two sides of the cover plate (6) are respectively provided with a fixing groove (9) for fixing the elastic pad (8) and the counterweight pressing plate (7).

8. The apparatus according to any one of claims 4 to 7, wherein The diamond composite sheet material cup removing device further includes a base (2), and at least one mounting groove (4) for mounting the diamond composite sheet with the external material cup is arranged on the base (2).

9. The apparatus according to claim 4, wherein The protective cover (1) is a cup-shaped structure for being invertedly mounted outside the material cup, the through hole (5) for exposing the center area of the end face of the material cup is arranged on the bottom of the protective cover (1), and the protective cover (1) further includes a cup body for covering the peripheral surface of the material cup outside the diamond composite sheet, and the cup body constitutes the peripheral surface covering part of the material cup.

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