TWI756822B - Abrasive diamond particles having at least four surfaces of different directions and method of manufacturing the same - Google Patents

Abstract

The subject invention discloses a method of manufacturing abrasive diamond particles having surfaces of at least four different directions, comprising: preparing a mold having a plurality of cavities thereon, each of the cavities having a conical shape as that of each of desired diamond particles; filling diamond powder mixture into the cavities; clamping the mold with a press to clamp the mold so as to sinter the diamond powder mixture under high temperature and high pressure to synthesize diamond particles each of which having the shape of each of the cavities.

Description

Grinding diamond particles having surfaces with at least four different directions, and method for producing the diamond particles

The present invention relates to a diamond particle for grinding which can be applied to a tool such as a grinding wheel and a manufacturing method of the diamond particle, and particularly relates to a diamond particle having surfaces with at least four different directions and a manufacturing method of the diamond particle.

As shown in the photo in Figure 1, the conventional artificial diamond particles do not have a specific shape and are attached to the body of the sand tire, which may cause insufficient gripping force or insufficient cutting force. The main reason for these problems is that the diamond particles themselves are round and their surface cannot provide multiple cutting directions. When attached to the sand tire body, only the rounded corners are exposed, lacking sharp corners that can be cut, and when applied in a certain direction, it is possible to Facing poor machinability.

The current method for solving the gripping force of artificial diamond particles in the body of the sand tire is to coat the outer layer of the diamond with metal. This added metal layer increases the surface area used to secure the diamond to the matrix for increased grip. However, with the rise of environmental awareness, the cost of electroplating wastewater treatment has increased, and with the advancement of technology, some processes cannot have metal residues, such as parts of 5G mobile phones, so metal layers should be avoided on artificial diamonds. In order for the artificial diamond to have sufficient grip on the sand tire body, it is necessary to provide other fixing structures.

The photograph of FIG. 3 shows a structure that provides improved cutting force with respect to conventional artificial diamonds. In order to provide a good cutting force by increasing the chance of exposing the cutting tip of the diamond, the prior art uses a predetermined arrangement of diamonds to improve the cutting force. However, this method is time-consuming and labor-intensive, and there is a certain chance that the sharp corner of the diamond is not facing upwards.

Another way to increase the cutting force is to fabricate the cutting tip by chemical vapor deposition (CVD), but this is very expensive and time-consuming.

Based on the aforementioned bottleneck of the prior art, it is necessary to provide an artificial diamond particle structure for fixing on the body of a grinding wheel and a manufacturing method thereof, which can have better grip without a metal layer, and its manufacturing method is relatively inexpensive , can provide better cutting force than the prior art while avoiding the high cost of chemical vapor deposition.

In order to solve the aforementioned problems, the present invention provides a process that can easily manufacture diamond particles with specific shapes and structures. These diamond particles provide an artificial diamond structure with more cutting tips (cutting corners). In particular, the artificial diamond particles according to the present invention have at least four differently oriented surfaces defining a plurality of cutting tips.

In one aspect, the present invention provides a method of manufacturing diamond particles for grinding with at least four differently oriented surfaces, the method comprising the steps of:

(1) Prepare a mold with a plurality of mold holes on the mold, wherein the shape of the mold holes of the mold holes corresponds to the shape of the diamond particles, and is in the shape of a pyramid; (2) The diamond powder mixture is filled into the mold (3) using a press to hold the mold, to subject the diamond powder mixture in the mold hole of the mold to high temperature and high pressure for sintering, so as to synthesize diamond particles having the shape of the mold hole.

Wherein step (2) further comprises placing a single crystal diamond particle into the center of the diamond powder mixture.

The present invention also provides diamond particles having surfaces with at least four different orientations made according to the above method.

In another aspect, the present invention also provides diamond particles having at least four differently oriented surfaces, comprising: a pyramid-shaped cut body having four differently oriented surfaces, wherein each surface has edges, and A cutting tip formed by the intersection of adjacent edges of the differently oriented surfaces; a single crystal diamond, which is located in the center of the diamond particle.

In yet another aspect, the present invention provides a diamond particle having at least four differently oriented surfaces, comprising: a core substantially polyhedral with a plurality of core surfaces; and a plurality of cuts, wherein the plurality of cuts Each cut portion of the core portion extends from one of a plurality of core surfaces of the core portion, wherein each of the cut portions has at least four differently oriented surfaces, and wherein the at least four Each surface has several edges, and cutting tips are formed by the intersection of adjacent edges of the surfaces.

Preferably, a bottom of at least one cutting portion is smaller than a corresponding surface of the core portion, and a peripheral band is exposed.

Preferably, the core portion is a cube.

In yet another aspect, the present invention provides a method of making abrasive diamond particles having at least four differently oriented surfaces, the diamond particles comprising: a core having a generally polygonal shape with a plurality of core surfaces; and a plurality of cuts wherein each cut portion of the plurality of cut portions extends from one of the plurality of core surfaces of the core portion, wherein each of the cut portions has at least four differently oriented surfaces . The method includes:

(1) prepare a mold, the mold is composed of an upper mold with an upper mold hole and a lower mold with a lower mold hole, and the shape of the mold hole of the upper mold hole and the lower mold hole corresponds to the upper half of the diamond particle. shape, lower half shape; (2) filling the diamond powder mixture into the die hole; (3) using a press to clamp the die, so as to apply high temperature and high pressure pressing to the diamond powder mixture in the die hole of the die. Sintered to synthesize diamond particles.

Preferably, the step (2) further comprises placing a single crystal diamond in the center of the diamond powder mixture.

Preferably, a bottom of at least one cutting portion is smaller than a corresponding surface of the core portion, and a peripheral band is exposed, and wherein the core portion is a cube.

The preferred choice of the artificial diamond material for the cutting abrasive in the present invention is the material of polycrystalline diamond (PCD). The advantages of polycrystalline diamond are good thermal conductivity, high hardness, and good wear resistance, which can obtain high processing precision and processing efficiency in cutting. efficacy. When making artificial diamonds, the required powder materials are placed in a mold and pressed at high temperature and high pressure. For Silicon Polycrystalline Diamond (SiPCD) composite materials, the manufacturing method is to mix silicon powder and diamond micro-powder (or "diamond micro-powder"), put it in a mold, and then press it under high temperature and high pressure.

According to a first embodiment of the present invention, the structure of the diamond particles has at least four surfaces in different directions to form a pyramid, a frustum, or other polyhedral shapes with more surfaces, wherein the diamond particles Each surface of the has a number of edges, and cutting tips are formed by the intersection of adjacent edges of the differently oriented surfaces.

According to another embodiment of the present invention, the diamond particle includes: a polygonal core portion having a plurality of surfaces, and a plurality of cutting portions extending from at least one of the plurality of surfaces of the core portion, the cutting portions Each of them has at least four surfaces in different directions, forming a pyramid, frustum, or other polyhedral shape with more surfaces, wherein each surface of each cut has edges, and is formed by the Cutting tips are formed by the intersection of adjacent edges of surfaces of different orientations. According to a preferred embodiment, the core portion of the diamond particle with the above-mentioned structure is a polyhedron, such as a cube, so that the overall shape of the diamond particle has a shape extending like a wave-absorbing block.

According to a preferred embodiment of the present invention, the center of the diamond particles as the cutting abrasive is provided with a reverse anvil element, and the diamond anvil is preferably a single crystal diamond particle. The diamond anvil is inserted into it before pressing the diamond particles.

According to the advantages of the present case, the bonding of crystals generally has a problem of directionality, but the diamond particles of the present invention can be grown on the grinding wheel at any position.

According to another advantage of the present case, the present case can use the technology of pressing diamond sheets to implant diamonds in a shape mold, and obtain the improved diamond particles under high temperature and high pressure.

The diamond particles obtained according to the disclosure of the present invention can provide advantages including increased cutting surface area, easy fixation of sharp points (cutting tips) on the diamond on the grinding wheel, and relatively low cost.

Therefore, based on the above, the present invention also discloses a manufacturing method for manufacturing the diamond particles.

The foregoing and other advantages of the present invention will be further understood from the description of the following embodiments.

present Pyramid of Shape and structure of diamond particles:

According to one embodiment of the present invention, the diamond particles (10) used on a cutting tool such as a grinding wheel to provide a grinding function comprise a cutting body in the shape of a pyramid with at least four surfaces (12) in different directions, Each of the surfaces (12) has edges (14) and cutting tips (16) formed by the intersection of adjacent edges of the differently oriented surfaces. The embodiment of the pyramid-shaped diamond particle (10) disclosed in FIG. 4A is a triangular abrasive having a tetrahedral shape, however, according to the spirit of the present invention, the diamond particle (10) may also be a frustum with a cross-sectional plane. According to the schematic diagram of the preferred embodiment as shown in FIG. 4B , a single crystal diamond particle can be set in the center of the diamond particle (10) of FIG. 4A as a diamond anvil (18). The diamond anvil (18) is inserted into it before pressing the diamond particles (10).

Direct pressing to produce diamond particles (10) :

The pressing method of the present invention (not shown in the figure) preferably uses a six-sided press to synthesize diamonds, wherein the diamond powder mixture is mainly filled in the die holes of the mold, and then the six-sided press is used to pressurize the mold . The diamond powder mixture can be, for example, a silicon polycrystalline diamond composite micropowder comprising a mixture of silicon powder and diamond powder. When filling the powder (filling mixed powder), in principle, the large particles are in the middle, and the small particles (fine powder) are filled in the side, and then go to synthetic pressing, so that the pressed diamond has a good density. The mold is preferably circular. Gaskets/washers are added on the outside of the mold to conduct electricity and transmit pressure. The mold is placed in a six-sided press, two of which can be energized, and the other four directions are only responsible for pressurization. When electrified, the mixture of diamond powders is synthesized by pressing in six directions by heating up with electricity. After the high temperature and high pressure synthesis is completed, the high temperature and high pressure synthesized diamond particles are obtained. Based on the above, the process of manufacturing diamond particles for grinding with surfaces of at least four different directions in the present invention generally includes: (1) providing a diamond powder mixture of diamond composite micropowder; (2) providing a mold, the mold is preferably A circular/cylindrical die hole with a specific shape; (3) placing the diamond powder mixture in the die hole; (4) sintering the diamond powder mixture under high temperature and pressure to form a diamond particle. Preferably, in step (3), a single crystal diamond can be further placed in the center of the die hole during powder filling, as a pair of diamond anvils (18) that provide opposing forces for pressing force.

5A and 5B are schematic diagrams of a mold for producing diamond particles (10) by pressing. Through the mould and by pressing, the diamond particles ( 10 ) of FIG. 4A and the diamond particles ( 10 ) with the diamond anvil ( 18 ) of FIG. 4B can be produced.

According to the disclosure of the aforementioned pressing method of the present invention, in order to manufacture the diamond particles (10) of FIG. 4A, the steps are: (A) preparing a preferably circular mold (100) with a plurality of mold holes (102) on it , the shape of each die hole (102) corresponds to the shape of the diamond particles (10), and is a pyramid/tetrahedron; (B) the diamond powder mixture is filled into the die holes (102); (C) a Press, hold the mold (100), and apply high temperature and high pressure pressing to the diamond powder mixture in the mold hole (102) of the mold (100) for sintering, so as to synthesize the diamond particles (10) of FIG. 4A. Because of its triangular section, it is triangular in appearance.

To form diamond particles (10) having an inverted diamond anvil (18) as shown in FIG. 4B, during the powder filling step (B) and before the pressing step (C), the diamond anvil is used as a diamond anvil The single crystal diamond particles of (18) are placed in the center of the diamond powder mixture, and then the high temperature and high pressure pressing of step (C) is performed to sinter the diamond particles (10) of triangular abrasives with the diamond anvil (18) shown in FIG. 4B . . In detail, the steps are: (A) preparing a preferably circular mold (100) with a plurality of mold holes (102) on it, the shape of the mold holes (102) corresponding to the diamond particles (10) (B) Fill the diamond powder mixture into the die holes (102), and put the single crystal diamond particles as the diamond anvil (18) into the diamond powder mixture when filling the powder (C) use a press to clamp the mold (100) to apply high temperature and high pressure pressing to the diamond powder mixture in the mold hole (102) of the mold (100) for sintering to synthesize a product. Diamond particles (10) of Figure 4B.

The purpose of the present invention is to provide a special structure of another diamond particle (ie "diamond anvil (18)") in the middle of the diamond particle (10), to improve the structure density obtained by the pressing process of the diamond particle (10), so as to obtain a higher density of diamond particles (10). In detail, if a single crystal diamond as a diamond anvil (18) is set in the middle of the diamond particles (10), in the pressing step, when the outer press starts to press the diamond powder mixture, the diamond anvil (18) in the center ), which will provide a reaction force to the pressure exerted by the press, and push back in the opposite direction; moreover, the contact part next to the reverse diamond anvil (18) will also be uniformly compressed, thus pressing out diamond particles with better structural density ( 10). In contrast, in the absence of a reverse diamond anvil, when the press starts to press the diamond powder mixture, the center of the diamond powder mixture will be offset by the upper and lower pressures, the middle pressure will be zero, and the force will be relatively poor, so that the central structure density of the diamond particles formed is poor. Therefore, thanks to the present invention placing a single crystal diamond in the center of the diamond powder mixture as a diamond anvil providing a counter-force, the resulting diamond particle (10) structure greatly improves the poor center compression of the diamond powder mixture , so that the diamond particles (10) have better structural density. It can be seen in FIG. 4B that the single crystal diamond is a complete diamond, and its volume is larger than that of the diamond powder particles.

Manufacture of diamond compacts by pressing (PCD) , Again Laser-cut diamond particles (10) :

6A and 6B are respectively a photograph and a schematic diagram of a diamond compact (PCD) ( 60 ) of diamond particles ( 10 ) produced by laser cutting, which is cylindrical.

According to the disclosure of the aforementioned pressing method of the present invention, in order to manufacture a diamond compact (PCD) (60), according to the aforementioned pressing method, the steps are: (A) preparing a cylindrical mold with cylindrical mold holes; (B) Putting the diamond powder mixture into the mold hole; (C) using a press, clamping the cylindrical mold, to apply high temperature and high pressure pressing to the diamond powder mixture in the mold hole of the mold for sintering to synthesize (synthesize) A cylindrical diamond composite sheet (60) corresponding to the shape of the cylindrical die hole is produced. Then, cutting includes: (D) laser cutting the diamond composite sheet (60) to cut out tetrahedral diamond particles (10) (triangular particles) with uniform size, shape and thickness as abrasives. In order to cut out the tetrahedral diamond particles (10) with uniform size, shape and thickness, a preferred cutting method of step (D) is based on the required tetrahedral outline of the diamond particles (10), using 120 angle Laser cutting; that is, turning 120 degrees after each cut side, for a total of three 120-degree cuts, to cut out the diamond grain abrasive. In this way, triangular grained (tetrahedral) diamond grain abrasives with uniform size, shape and thickness can be obtained.

The diamond powder mixture used in the foregoing process may include large-sized diamonds (eg, nitrogen-containing diamonds) and fine-powdered small-sized diamonds (eg, boron-containing diamonds). When filling the diamond powder mixture into the die hole of the cylindrical mold, fill the large diamond in the middle and the small (fine powder) diamond in the side, so that the diamonds are tightly packed together to sinter a better diamond structure .

Tool Pyramid shaped cutting section of Diamond particles and their production method:

As shown in FIG. 7, according to another embodiment of the present invention, the diamond particle (20) comprises: a core portion (21), the core portion (21) is substantially polygonal and has a plurality of core surfaces; and a plurality of cutting portions, wherein each cutting portion of the plurality of cutting portions extends from one of the surfaces of the plurality of core surfaces of the core portion (21), wherein each of the cutting portions has at least four surfaces (22) in different directions ) to form a pyramid, frustum, or other polygonal shape with more surfaces. Wherein, each surface (22) has several edges (27), and cutting tips (28) are formed by the intersection of adjacent edges of the surfaces in different directions. The diamond particles (10) shown in FIGS. 4A and 4B are a single cutting part; while the embodiment of FIG. 7 mainly provides a structure with multiple core parts (21) so that the diamond particles (20) can accommodate more cutting parts to provide For better effect, the principle of each cutting part is basically the same as that of FIG. 4A and FIG. 4B . In the embodiment of Figure 7, the bottom of the cut portion is smaller than a corresponding surface (22) of the core portion (21), exposing a peripheral band. In the preferred embodiment shown in FIG. 7 , the core part (21) of the diamond particle (20) with the above-mentioned structure is a polyhedron, such as a cube, so that the shape of the whole diamond particle has a shape extending like a wave-absorbing block. . Each cutting portion may be a frustum cone with a cross-sectional plane.

The diamond particles (20) can be formed by first opening a mold and then pressing with high temperature and high pressure in a similar manner as described above. The pressing and manufacturing steps are: (A) preparing a mold, which consists of an upper mold with an upper mold hole and a lower mold hole. The lower mold is formed, and the shape of the mold hole of the upper mold hole and the lower mold hole corresponds to the upper half shape and the lower half shape of the diamond particle (20) respectively; (B) the diamond powder mixture is filled in these mold holes; (C) ) using a press, clamping the mold to apply high temperature and high pressure pressing to the diamond powder mixture in the mold hole of the mold for sintering, so as to synthesize the diamond particles (20) of FIG. 7 . In order to manufacture the single crystal diamond particles containing the diamond anvil (18) in each cutting part, when the above step (B) fills the diamond powder mixture into the die holes, it further comprises the step of filling the diamond powder mixture into the die holes as the diamond anvil (18). Single crystal diamond particles are placed in the center of the diamond powder mixture.

The diamond particles (10;20) with the shape of this case can be fixed on the grinding wheel by sintering or electroplating (nickel plating). Because of the special shape of the diamond particles (10;20), they can have better anchoring force. Since the fixed shapes with different directions are more complex, and the diamond particles have a larger fixed surface area to attach to the sand tire body than the conventional diamond particles, it has better fixing force than the conventional technology.

FIGS. 8A to 8E are comparison diagrams of the diamond particles ( FIG. 8A ) with the shape of the pyramid (tetrahedron) and other shapes ( FIGS. 8B to 8E ) of the present invention. It can be understood that among different shapes, the pyramid in this case has the fewest sharp corners and ridges, and is the sharpest abrasive in physical structure. In addition, diamond particles are made by the process of this case, which has the advantage of a controllable tip design, and when diamond particles are set on the grinding wheel, their sharp corners (ie cutting tips) are always facing upward, so that the grinding wheel has excellent cutting force.

The foregoing description of the preferred embodiments of the present invention is merely illustrative, and is not intended to limit the characteristics of the present invention. Any process or product with the features listed in the scope of the patent application should be considered to fall within the scope of the disclosure of the present invention.

10: Diamond particles 12: Surface 14: Edge 16: Cutting tip 18: Reverse Diamond Anvil 20: Diamond particles 21: Core Department 22: The face of the core 24: Surface 27: Edge 28: Cutting tip 60: Diamond Composite 100: Mold 102: Die hole

Figure 1 is a photograph of a conventional embodiment of diamond particles.

Figure 2 is a photograph of another conventional embodiment of diamond particles showing that the diamond is coated with a metal layer to increase the surface area of the diamond.

FIG. 3 is a photograph of yet another conventional embodiment of diamond particles showing that the plurality of diamonds have a predetermined arrangement to improve the diamond cutting force on the grinding wheel.

4A is a schematic diagram of the first embodiment of the diamond particles of the present invention.

FIG. 4B shows a preferred embodiment of the diamond particle of FIG. 4A with a single crystal diamond particle positioned in the center of the diamond particle as a diamond anvil.

5A and 5B are schematic diagrams of a mold for producing diamond particles by a pressing method.

6A and 6B are schematic diagrams of diamond compacts used for making diamond particles by laser cutting.

FIG. 7 is a schematic diagram of another embodiment of the diamond particles of the present invention.

8A to 8E are comparison diagrams of diamond particles having a pyramid (tetrahedron) shape according to the present invention ( FIG. 8A ) and diamond particles of other shapes ( FIGS. 8B to 8E ).

10: Diamond particles

12: Surface

14: Edge

16: Cutting tip

18: Reverse Diamond Anvil

Claims (12)

A kind of method that manufactures the grinding with the surface of at least four different directions with diamond particles, comprising: (A) prepare a mould, this mould has a plurality of die holes, and wherein the shape of the die holes of these die holes corresponds to the shape of this diamond particle , and in the shape of a pyramid; (B) filling the diamond powder mixture into the die holes, and placing a diamond anvil in the center of the diamond powder mixture; (C) using a press to clamp the mold to align the mold The diamond powder mixture in the die hole is subjected to high temperature and high pressure pressing for sintering, so as to synthesize diamond particles with the die hole shape. The method of claim 1, wherein the diamond anvil is a single crystal diamond. A diamond particle having surfaces with at least four different orientations, produced according to the method of claim 1 or 2. A diamond particle having at least four surfaces in different directions, comprising: a cutting body in the shape of a pyramid with four surfaces in different directions, wherein each surface has a number of edges, and The intersection of adjacent edges of the surface forms a cutting tip; a diamond anvil, which is located in the center of the diamond particle. The diamond particles of claim 4, wherein the diamond anvil is a single crystal diamond. A diamond particle having at least four differently oriented surfaces, comprising: a core substantially polyhedral with a plurality of core surfaces; and a plurality of cuts, wherein each cut of the plurality of cuts extends from the core One of the surfaces of the plurality of core surfaces of the portion extends, wherein each of the cut portions has at least four surfaces in different directions, and wherein each surface of the at least four surfaces in different directions has a plurality of edges, and a cutting tip formed by the intersection of the adjacent edges of the surfaces; wherein, a diamond anvil is arranged in the center of at least one cutting part. The diamond particle of claim 6, wherein the diamond anvil is a single crystal diamond. The diamond particle of claim 6 or 7, wherein a bottom of at least one cut portion is smaller than a corresponding surface of the core portion, exposing a peripheral band. The diamond particle of claim 6 or 7, wherein the core is a cube. A method of manufacturing diamond particles for grinding with surfaces of at least four different orientations, the diamond particles comprising: a core portion having a substantially polygonal shape with a plurality of core surfaces; and a plurality of cutting portions, wherein the plurality of cutting portions are each cut from the core One of the surfaces of the plurality of core surfaces of the portion extends, wherein each of the cut portions has at least four surfaces in different directions; the method includes: (A) preparing a mold, the mold having an upper mold hole The upper mold and the lower mold with the lower mold hole are formed, and the shapes of the upper mold hole and the lower mold hole are respectively corresponding to the upper half shape and the lower half shape of the diamond particle; (B) the diamond powder mixture is filled into these molds (C) using a press, clamping the mould, to apply high temperature and high pressure pressing to the diamond powder mixture in the mould hole of the mould for sintering, With synthetic diamond particles. The method of claim 10, wherein: the diamond anvil is a single crystal diamond. The method of claim 10 or 11, wherein: a bottom of the at least one cut portion is smaller than a corresponding surface of the core portion, exposing a peripheral band, and wherein the core portion is a cube.

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