A pressure transmission device for a six-sided top press for producing superhard materials

Abstract

The utility model discloses a pressure transmission device for a six-sided top press for producing superhard materials. By arranging a contraction-type convex pressure transmission surface at the top of the top hammer and a groove matched with a phyllite block, on the one hand, the distance from the top hammer surface to the outer wall of the through hole is reduced, and the pressure transmission efficiency at the core synthesis position is significantly improved; on the other hand, the pressure can be concentrated to the convex part, which greatly improves the synthesis pressure at the synthesis position in the synthesis cavity, which is conducive to the realization and establishment of an ultra-high pressure field of 8GPa or above.

Description

Technical Field

[0001] The utility model relates to a pressure transmission device, in particular to a pressure transmission device for a six-sided top press machine for producing superhard materials, belonging to the technical field of superhard material synthesis. Background Art

[0002] The six-sided top press is divided into two types: hinge type and pull rod type. The maximum pressure that can be achieved by the hexahedral and octahedral pressure chamber is about 15-30GPa. There are many companies in China that produce it. The six-sided top press is the most widely used large-cavity press in China. This press has the advantages of strong self-centering, low cost, and easy operation. It is the main equipment for synthesizing superhard materials such as diamond and cubic boron nitride (cBN) in China.

[0003] Taking the polycrystalline diamond carbide composite sheet (hereinafter referred to as "composite sheet") as an example of superhard materials, it is made by sintering diamond micropowder and carbide matrix under high pressure and high temperature. The composite sheet has become the main cutting component of drilling and tunneling equipment. At present, the main equipment for producing diamond composite sheets in China is the hinged beam type six-sided top press. The six pistons of the press push the carbide top hammer connected to its top forward. The end faces of the six carbide top hammers form a cubic space, in which a composite phyllite block with pressure transmission and sealing functions is placed. The phyllite block is a nearly cubic structure with a cylindrical synthesis cavity inside. The synthesis cavity forms a high temperature and high pressure environment of 1300-1800℃ and 5-9GPa required for the sintering synthesis of the composite sheet.

[0004] With the development of the market in the fields of oil and gas drilling, engineering tunneling, coal mining, etc., the requirements for the wear resistance of composite sheets are getting higher and higher, and the synthesis cavity pressure required for high-end composite sheets is also getting higher and higher. At present, the carbide top hammer and talc block on the six-sided top press are the key components for the high pressure required in the high-temperature and high-pressure synthesis of composite sheets. How to simultaneously obtain high pressure transmission efficiency in the synthesis process of composite sheets and form a stable cavity pressure field through the sealing cooperation between the talc block and the top hammer is the key to the current high-temperature and high-pressure synthesis, especially the establishment and application of ultra-high pressure fields of 8GPa and above.

[0005] In response to the above problems, current research mainly focuses on adjusting the material and structure of the phyllite block on the basis of matching the existing top hammer structure, or improving the material and structure of the top hammer on the premise of matching the existing phyllite block structure, in order to improve the pressure transmission efficiency and sealing performance. The improvements of these two methods are often concentrated on accessory manufacturers in different fields. Although there are improvements to varying degrees, they have not achieved synchronous and coordinated improvements of the two. In particular, the phyllite block wall thickness is often too thick at the height center of the phyllite block, that is, the core position of polycrystalline diamond synthesis. In addition, the phyllite material shrinks greatly under high temperature, resulting in low pressure transmission efficiency, making it difficult to achieve stable establishment of ultra-high pressure of 8GPa and above.

[0006] In view of the above-mentioned shortcomings, it is necessary to provide a pressure transmission device for a six-sided top press for producing superhard materials. Utility Model Content

[0007] The utility model provides a pressure transmission device for a six-sided top press for producing superhard materials, which is used for transmitting pressure in producing superhard materials and overcomes the defects of low pressure transmission efficiency and difficulty in establishing superhigh pressure in the prior art.

[0008] To achieve the above purpose, the scheme of the utility model is as follows:

[0009] A pressure transmission device for a six-sided top press for producing superhard materials, comprising a pyrophyllite block and a top hammer for transmitting pressure to the six sides of the pyrophyllite block; a through hole is provided in the pyrophyllite block, and a groove extending radially toward the through hole is provided on the side of the pyrophyllite block; the top hammer comprises a first top hammer arranged on four side faces, and a second top hammer arranged along the through hole; the first top hammer comprises, from bottom to top, a group of inclined surfaces contracting along a center line and a raised pressure transmission surface, the structure of the raised pressure transmission surface matches that of the groove; a raised portion is provided on the top of the raised pressure transmission surface, the cross section of the raised portion is circular, and any longitudinal section is arc-shaped.

[0010] Furthermore, the second top hammer shrinks along the center line from the bottom to the pressure transmission surface, and the non-stress-bearing surface of the waist is approximately parallel to the inclined surface group of the adjacent first top hammer.

[0011] Furthermore, the first top hammer is provided with a first inclined surface group, a second inclined surface group, and a third inclined surface group which shrink along the center line in sequence from bottom to top; the inclined surfaces in the same inclined surface group have the same shrinkage angle; the third inclined surface group and the raised portion form a raised pressure transmission surface; and the cross section enclosed by the third inclined surface group is a square.

[0012] Preferably, the cross sections enclosed by the first inclined surface group and the second inclined surface group are respectively square.

[0013] Preferably, the angles of the first bevel group, the second bevel group and the third bevel group relative to the horizontal cross-sectional plane are α, β and γ respectively; α is 45-46°, more preferably 46°; β is 41-43°, more preferably 42°; γ is 0-15°, more preferably 8°.

[0014] Furthermore, the height of the circular protrusion is 0.1-8.5 mm, preferably 3.8 mm.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model provides a pressure transmission device for a six-sided top press for producing superhard materials, which is composed of a top hammer group and a phyllite block matched therewith, and a contraction-type convex pressure transmission surface and a groove matched with the phyllite block. On the one hand, the distance from the top hammer surface to the outer wall of the through hole is reduced, which significantly improves the pressure transmission efficiency at the core synthesis position; on the other hand, the pressure can be concentrated to the convex part, which greatly increases the synthesis pressure at the synthesis position in the synthesis cavity, which is conducive to the realization and establishment of an ultra-high pressure field of 8GPa or above. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the working state of the pressure transmission device of the six-sided top press for producing superhard materials described in the utility model.

[0018] Figure 2 The utility model is a schematic diagram of an explosion of a pressure transmission device for a six-sided top press for producing superhard materials.

[0019] Figure 3 This is the front view of the first top hammer of the utility model.

[0020] Figure 4 This is a top view of the first top hammer of the utility model.

[0021] Figure 5 It is a longitudinal cross-sectional view of the pyrophyllite block described in the utility model.

[0022] Figure 6 This is a top view of the pyrophyllite block described in the utility model.

[0023] Among them: 1. first top hammer; 2. second top hammer; 3. talc block; 11. contraction surface; 12. raised pressure transmission surface; 31. groove; 32. through hole; 101. first inclined surface group; 102. second inclined surface group; 103. third inclined surface group; 104. raised part; 301. side plane; 302. fourth inclined surface group; 303. recessed part. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be determined according to specific circumstances.

[0027] In one embodiment, Figure 1-6 As shown, a pressure transmission device for a six-sided top press for producing superhard materials is proposed, including a phyllite block 3 and a top hammer for transmitting pressure to the six sides of the phyllite block 3; a through hole 32 is provided in the phyllite block 3, and a groove 31 extending radially to the through hole 32 is provided on the side of the phyllite block 3; the top hammer includes a first top hammer 1 arranged on four sides, and a second top hammer 2 arranged along the through hole direction; the first top hammer 1 includes a first inclined surface group 101, a second inclined surface group 102, and a third inclined surface group 103 from bottom to top including contraction along the center line; the inclined surfaces in the same inclined surface group have the same contraction angle; the first inclined surface group 101 and the second inclined surface group 102 constitute an inclined surface group; a raised portion 104 is provided on the top of the third inclined surface group 103, and the two constitute a raised pressure transmission surface 12. The raised pressure transmission surface 12 matches the groove 31; the cross section enclosed by the third inclined surface group (103) is square. The cross section of the raised portion 104 is circular, and any longitudinal section is arc-shaped. As shown Figure 5-6 As shown, any side surface of the pyrophyllite block 3 perpendicular to the through hole 32 is composed of a side plane 301, a fourth inclined surface group 302 and a recessed portion 303, the fourth inclined surface group 302 matches the third inclined surface group 103, and the recessed portion 303 matches the raised portion 104. That is, during operation, the raised portion 104 enters the recessed portion 303, the third inclined surface group 103 and the fourth inclined surface group 302 abut against each other, and pressure transmission is achieved through the raised pressure transmission surface 12 formed by the third inclined surface group 103 and the raised portion 104.

[0028] In the above embodiment, the pressure transmission device is composed of a top hammer group and a matching talc block to provide a contraction-type raised pressure transmission surface and a matching groove. On the one hand, the distance from the top hammer surface to the outer wall of the through hole is reduced, which significantly improves the pressure transmission efficiency at the core synthesis position; on the other hand, the pressure can be concentrated on the raised portion, which greatly increases the synthesis pressure at the synthesis position in the synthesis cavity, which is conducive to the realization and establishment of an ultra-high pressure field of 8 GPa or above.

[0029] In the above embodiment, if Figure 4 As shown, the first bevel group 101, the second bevel group 102 and the third bevel group 104 of the first top hammer 1 all contain four symmetrical bevels of equal area. The four bevels of the first bevel group 101 bevel the cone and intersect with the four bevels of the second bevel group 102. The four bevels of the second bevel group 102 intersect with the four bevels of the third bevel group 103. The four bevels of the third bevel group 103 intersect with the bottom surface of the top center protrusion 104. The structure surrounded by the first bevel group 101, the second bevel group 102 and the third bevel group 104 are all in the positive direction in the cross section. In high temperature and high pressure synthesis, the force uniformity of the first top hammer 1 is greatly improved, and the service life of the top hammer under high pressure is significantly increased, with significant economic benefits.

[0030] In a preferred embodiment, Figure 5-6 As shown, for the phyllite block 3, the side plane 301 is provided with a certain width to ensure the distance between the groove 31 and the edge of the phyllite block 3, so as to form a high-pressure seal under ultra-high pressure and play a sealing and pressure-maintaining role. In addition, the second top hammer 2 is shrinkable from the bottom along the force-bearing surface direction, and preferably, the non-force-bearing surface of its waist is similar to or the same as the contraction angle of the first inclined surface group 101 and the second inclined surface group 102 of the first top hammer 1, and forms a nearly parallel inclined surface with the adjacent inclined surface group 11. During high-temperature and high-pressure synthesis, for the phyllite block 3, the fourth inclined surface group 302 is contacted and squeezed by the third inclined surface group 103 of the top hammer, the recessed portion 303 is contacted and squeezed by the raised portion 104, and the 12 edges connected to the side plane 301 and the surrounding areas are compressed into the gap between the adjacent top hammers by high-pressure extrusion deformation flow ( Figure 1 ), such as extending toward the surface of the second inclined surface group 102, thereby forming a high-pressure sealing and pressure-maintaining effect for the phyllite block.

[0031] In a preferred embodiment, Figure 3As shown, in the first top hammer 1, the angles of the first bevel group 101, the second bevel group 102 and the third bevel group 103 relative to the cross-sectional direction are α, β and γ respectively; α is 45-46°, β is 41-43°, and γ is 0-15°; preferably, α, β and γ are 46°, 42° and 8° respectively. The height of the protrusion 104 is 0.1-8.5mm, preferably 3.8mm. The setting of the above angle and height parameters reduces the distance from the top hammer surface at the synthetic core position to the outer wall of the heating tube in the through hole by more than 40%, significantly improving the pressure transmission efficiency at the core synthesis position.

[0032] In some embodiments, a commonly used square protrusion may be selected as the top force-bearing surface of the second top hammer 2. As a conventional setting in the art, the sealing treatment and setting of the through hole 32 of the pyrophyllite block 3 during high temperature and high pressure synthesis are not described here.

[0033] 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 pressure transmission device for a six-sided top press for producing superhard materials, characterized in that: The invention comprises a phyllite block (3) and a top hammer for transmitting pressure to six surfaces of the phyllite block (3); a through hole (32) is provided in the phyllite block (3), and a groove (31) extending radially toward the through hole (32) is provided on the side surface of the phyllite block (3); the top hammer comprises a first top hammer (1) provided on four side surfaces, and a second top hammer (2) provided along the through hole (32); the first top hammer (1) comprises, from bottom to top, a group of inclined surfaces (11) contracting along a center line and a convex pressure transmission surface (12), the structure of the convex pressure transmission surface (12) matching that of the groove (31); a convex portion (104) is provided on the top of the convex pressure transmission surface (12), the cross section of the convex portion (104) is circular, and any longitudinal cross section is arc-shaped.

2. The pressure transmission device according to claim 1, characterized in that: The second top hammer (2) shrinks along the center line from the bottom to the pressure transmission surface, and its waist non-stress surface is approximately parallel to the inclined surface group (11) of the adjacent first top hammer (1).

3. The pressure transmission device according to claim 1, characterized in that: The first top hammer (1) is provided with a first inclined surface group (101), a second inclined surface group (102), and a third inclined surface group (103) which are contracted along the center line in sequence from bottom to top; the inclined surfaces in the same inclined surface group have the same contraction angle; the third inclined surface group (103) and the raised portion (104) form a raised pressure transmission surface (12); and the cross section enclosed by the third inclined surface group (103) is a square.

4. The pressure transmission device according to claim 3, characterized in that: The cross sections enclosed by the first inclined surface group (101) and the second inclined surface group (102) are respectively square.

5. The pressure transmission device according to claim 3 or 4, characterized in that: The angles of the first inclined plane group (101), the second inclined plane group (102) and the third inclined plane group (103) relative to the cross-sectional direction are α, β and γ respectively; α is 45-46°, β is 41-43°, and γ is 0-15°.

6. The pressure transmission device according to claim 5, characterized in that: The α, β and γ correspond to 46°, 42° and 8° respectively.

7. The pressure transmission device according to claim 1, characterized in that: The height of the protrusion (104) is 0.1-8.5 mm.

8. The pressure transmission device according to claim 7, characterized in that: The height of the protrusion (104) is 3.8 mm.

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