Assembly for synthesizing composite sheet with middle hole and synthesis method thereof

Abstract

The invention relates to an assembly for synthesizing a composite sheet with a hole in the middle and a synthesis method thereof. The assembly comprises a metal cup and an auxiliary core. The metal cup comprises a buckle cover matched with the hard alloy substrate and a cup body A; diamond micro-powder mixed with a binding agent and a hard alloy matrix are sequentially contained in the cup body A from bottom to top; the hard alloy base body is annular; the auxiliary core is a cylindrical body corresponding to the mounting hole and sequentially penetrates through the axis of the hard alloy matrix and the axis of the diamond micro-powder layer from top to bottom; the auxiliary core is made of high-melting-point metal; the buckle cover is buckled on the top of the cup body A and connected with the top of the hard alloy matrix; the synthesis method comprises the following steps: (1) preparing raw materials; (2) synthesizing at high temperature and high pressure; when the auxiliary core is used for high-temperature and high-pressure synthesis, the metal cup is supported to guarantee forming of the composite sheet; during machining, the auxiliary core can reduce the drilling difficulty of the mounting hole, the cutting machining cost of the mounting hole is reduced, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of diamond composite sheet synthesis, in particular to a composite component used for synthesizing a composite sheet with a middle hole and a synthesis method thereof. Background Art

[0002] The composite sheet with a hole in the middle is provided with an axially penetrating mounting hole at the axis position for installation. The current method for synthesizing the composite sheet with a hole in the middle is as follows: Step 1, prepare the raw materials. Select an appropriate amount of diamond micropowder and cemented carbide matrix, mix them, and put them into the metal cup; Step 2, high temperature and high pressure synthesis. Put the prepared raw materials into the pyrophyllite block to form a synthetic block; put the synthetic block into a six-sided top press for high temperature and high pressure synthesis; Step 3, mechanical processing. Peel off the external metal cup, and then process the mounting hole by grinding, laser cutting, etc.

[0003] However, both diamond and cemented carbide substrates are extremely hard materials. It is necessary to use laser cutting technology to rough-machine the mounting holes first, and then use grinding technology to fine-machine the mounting holes. The processing efficiency is very low. For thicker composite sheets, the mounting holes are difficult to process. Because the thickness of the composite sheet is too large, it is difficult for laser cutting to cut through the composite sheet to perform rough machining of the mounting holes. The existing composite sheet synthesis method with a hole in the middle is difficult to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and to provide an assembly used for synthesizing a composite sheet with a middle hole and a synthesis method thereof.

[0005] The technical scheme of the present invention is: a composite component for synthesizing a composite sheet with a middle hole comprises a metal cup and an auxiliary core; the metal cup comprises a buckle cover and a cup body armor matched with a cemented carbide substrate; the cup body armor contains diamond micropowder mixed with a binder and a cemented carbide substrate in order from bottom to top; the cemented carbide substrate is in a circular ring shape, which is obtained by mixing tungsten carbide powder and cobalt powder in a certain proportion, pressing at room temperature, and sintering at high temperature under slight pressure; the auxiliary core is a columnar body corresponding to the mounting hole, and passes through the axis of the cemented carbide substrate and the diamond micropowder layer in order from top to bottom; the position of the auxiliary core corresponds to the mounting hole The position of the hole; the auxiliary core is made of a high melting point metal and has certain strength and high temperature resistance; metals such as molybdenum, niobium, tungsten, titanium and their alloys can be used as materials for making the auxiliary core; the melting point of molybdenum is 2623°C, the melting point of niobium is 2477°C, and the melting point of tungsten is 3422°C. The corresponding melting points of related alloys are also very high. The temperature of the high temperature and high pressure synthesis of the present invention is between 1450°C and 1550°C. Therefore, these high melting point metals and their alloys will not become liquid at this temperature and can play a supporting role; the buckle cover is buckled on the top of the cup body armor and connected to the top of the cemented carbide substrate.

[0006] Preferably, the cup body armor includes a circular bottom plate, an inner wall armor, and an outer wall armor; the bottom end of the inner wall armor and the bottom end of the outer wall armor are respectively connected to the inner edge and the outer edge of the circular bottom plate; the bottom of the diamond micropowder mixed with a binder is connected to the circular bottom plate; the inner wall armor and the outer wall armor cooperate to confine the diamond micropowder on the circular bottom plate between the inner wall armor and the outer wall armor to facilitate the formation of the diamond layer; the top of the outer wall armor is higher than the top of the inner wall armor; the auxiliary core passes through the axis of the inner wall armor.

[0007] Furthermore, the buckle cover includes a circular top plate, an inner wall B, and an outer wall B; the top of the inner wall B and the top of the outer wall B are respectively connected to the inner edge and the outer edge of the circular bottom plate; the bottom of the circular top plate is connected to the top of the cemented carbide substrate; the auxiliary core passes through the center of the inner wall B.

[0008] Furthermore, the inner wall A is connected to the side of the auxiliary core; the inner wall B is connected to the inner wall of the cemented carbide substrate; the inner wall A and the inner wall B overlap; in this way, the auxiliary core is easily stuck on the upper end of the inner wall B and is not easy to fall off.

[0009] Furthermore, the metal cup also includes cup body B; the cup body B includes a circular bottom plate and an annular outer wall; the lower end of the annular outer wall is connected to the outer edge of the circular bottom plate; the annular outer wall is abutted against the outer wall of cup body A; the top of the circular bottom plate is connected to the bottom of cup body A to prevent the auxiliary core from falling.

[0010] Preferably, the outer diameter of the auxiliary core is greater than the inner diameter of the mounting hole, so that it is easy to perform fast and low-cost drilling processing with an ordinary drill bit after synthesis; the remaining part of the auxiliary core is also tightly combined with the inner hole of the cemented carbide; the inner hole of the auxiliary core is the mounting hole.

[0011] A method for synthesizing an assembly using the above-mentioned composite sheet with intermediate holes ①Prepare raw materials The auxiliary core is inserted vertically into the center of the cup body armor; the binder and diamond micropowder are mixed evenly; an appropriate amount of diamond micropowder mixed with the binder is selected and placed at the bottom of the cup body armor; the cemented carbide matrix is ​​sleeved outside the auxiliary core, placed inside the cup body armor, and pressed on the mixed diamond micropowder; in this way, the upper section of the auxiliary core supports the cemented carbide matrix during high temperature and high pressure synthesis, and the lower end supports the synthesized diamond, which can avoid deformation and maintain the basic shape of the installation hole; the buckle cover is buckled on the top of the cup body armor and connected with the top of the cemented carbide matrix; ②High temperature and high pressure synthesis Put the prepared raw materials into the pyrophyllite block to form a synthetic block; the pyrophyllite block has heating devices, pressure transmission devices, heat conduction devices, etc. inside to facilitate high temperature and high pressure synthesis; put the synthetic block into a six-sided top press for high temperature and high pressure synthesis; the synthesis pressure is 5.5~7.5GPa, and the synthesis temperature is 1450~1550℃; the auxiliary core supports the metal cup to ensure the formation of the composite sheet; the metal cup ensures that the diamond powder is formed and connected to the cemented carbide bottom; ③Machining The synthetic block is taken out and the talc block is peeled off; the outer metal cup is peeled off by sandblasting to expose the internal composite sheet body; the outer circle of the composite sheet is ground until the outer diameter of the composite sheet reaches the outer diameter of the finished composite sheet; the top of the composite sheet is plane-ground until the height of the composite sheet reaches the height of the finished composite sheet; the auxiliary core part is drilled to form a mounting hole; because the auxiliary core is much easier to process than the diamond layer or cemented carbide, the cutting cost of the mounting hole is reduced and the processing efficiency is improved.

[0012] Furthermore, the outer diameter of the auxiliary core is less than the inner diameter of the mounting hole; after synthesis, fast and low-cost drilling with an ordinary drill bit can only remove the auxiliary core as much as possible, and the size requirement of the mounting hole cannot be met; therefore, after drilling the auxiliary core part, the mounting hole is finely processed by discharge / wire cutting / laser. Compared with the existing synthesis method, the difficulty has been reduced a lot, and the efficiency and processing quality are also guaranteed, thereby improving the wear resistance of the mounting hole.

[0013] The beneficial effects of the present invention are as follows: the assembly used for the synthetic intermediate hole composite sheet of the present invention has the following advantages: (1) The present invention uses the auxiliary core to support the metal cup during high temperature and high pressure synthesis to ensure the formation of the composite sheet; the metal cup ensures the formation of the diamond powder and is connected to the cemented carbide bottom; during mechanical processing, the auxiliary core can reduce the difficulty of drilling the mounting hole, reduce the cutting processing cost of the mounting hole, and improve the processing efficiency; (2) The outer diameter of the auxiliary core of the present invention is greater than the inner diameter of the mounting hole, which facilitates rapid and low-cost drilling processing with a common drill bit after synthesis; the remaining part of the auxiliary core is still tightly combined with the inner hole of the cemented carbide; the inner hole of the auxiliary core is the mounting hole; (3) The outer diameter of the auxiliary core of the present invention is less than the inner diameter of the mounting hole, which ensures low processing difficulty and high processing efficiency, guarantees processing quality and improves the wear resistance of the mounting hole.

[0014] The synthesis method can reduce the difficulty of drilling the mounting hole during mechanical processing, reduce the cutting processing cost of the mounting hole, and improve the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a sectional perspective view of the assembly in the first embodiment; Figure 2 is a sectional perspective view of the assembly in the second embodiment; Figure 3 is a sectional perspective view of the assembly in the third embodiment; Figure 4 is a cutaway perspective view of the assembly in the fourth embodiment; Figure 5is a cross-sectional stereogram of the raw materials used in the synthesis method of Example 5; Figure 6 is a cross-sectional stereogram of the first raw material used in the synthesis method of Example 6; Figure 7 is a cross-sectional stereogram of the second raw material used in the synthesis method of Example 6; Figure 8 is a cross-sectional stereogram of the third raw material used in the synthesis method of Example 6; In the figure: 1. diamond powder, 2. cemented carbide substrate, 31. buckle cover, 311. circular top plate, 312. inner wall B, 313. outer wall B, 32. cup body A, 321. circular bottom plate, 322. inner wall A, 323. outer wall A, 33. cup body B, 331. circular bottom plate, 332. annular outer wall, 4. auxiliary core. DETAILED DESCRIPTION

[0016] Example 1: See Figure 1 A composite component for synthesizing a composite sheet with a middle hole includes a metal cup and an auxiliary core 4; the metal cup includes a buckle cover 31 and a cup body armor 32 matched with a cemented carbide substrate 2; the cup body armor 32 contains diamond powder 1 mixed with a binder and a cemented carbide substrate 2 in order from bottom to top; the cemented carbide substrate 2 is annular and is obtained by mixing tungsten carbide powder and cobalt powder in a certain proportion, pressing at room temperature, and sintering at high temperature under slight pressure; the auxiliary core 4 is a columnar body corresponding to the mounting hole, and passes through the axis of the cemented carbide substrate 2 and the diamond powder 1 layer from top to bottom in order; the position of the auxiliary core 4 corresponds to the mounting hole The position of the hole; the auxiliary core 4 is made of a high melting point metal and has certain strength and high temperature resistance; metals such as molybdenum, niobium, tungsten, titanium and their alloys can be used as the material for making the auxiliary core 4; the melting point of molybdenum is 2623°C, the melting point of niobium is 2477°C, and the melting point of tungsten is 3422°C. The corresponding melting points of the relevant alloys are also very high. The temperature of the high temperature and high pressure synthesis of the present invention is between 1450°C and 1550°C. Therefore, these high melting point metals and their alloys will not become liquid at this temperature and can play a supporting role; the buckle cover 31 is buckled on the top of the cup body A 32 and connected to the top of the cemented carbide substrate 2.

[0017] Compared with the prior art, the present invention utilizes the auxiliary core 4 to support the metal cup during high temperature and high pressure synthesis to ensure the forming of the composite sheet; the metal cup ensures the formation of the diamond powder and is connected to the cemented carbide bottom as a whole; during mechanical processing, the auxiliary core 4 can reduce the difficulty of drilling the mounting hole, reduce the cutting processing cost of the mounting hole, and improve processing efficiency.

[0018] The outer diameter of the auxiliary core 4 is greater than the inner diameter of the mounting hole, which facilitates fast and low-cost drilling processing with an ordinary drill bit after synthesis; the remaining part of the auxiliary core 4 is also tightly combined with the inner hole of the cemented carbide; the inner hole of the auxiliary core 4 is the mounting hole.

[0019] Example 2: See Figure 2 , Embodiment 2 is basically the same as Embodiment 1, and the similarities are not repeated here. The differences are as follows: the cup body armor 32 includes a circular bottom plate 321, an inner wall armor 322, and an outer wall armor 323; the bottom ends of the inner wall armor 322 and the outer wall armor 323 are respectively connected to the inner edge and the outer edge of the circular bottom plate 321; the bottom of the diamond powder 1 mixed with a binder is connected to the circular bottom plate 321; the inner wall armor 322 and the outer wall armor 323 cooperate to confine the diamond powder 1 on the circular bottom plate 321 between the inner wall armor 322 and the outer wall armor 323, so as to facilitate the formation of the diamond layer; the top of the outer wall armor 323 is higher than the top of the inner wall armor 322; the auxiliary core 4 passes through the axis of the inner wall armor 322.

[0020] The buckle cover 31 includes a circular top plate 311, an inner wall B 312, and an outer wall B 313; the top of the inner wall B 312 and the top of the outer wall B 313 are respectively connected to the inner edge and the outer edge of the circular bottom plate 321; the bottom of the circular top plate 311 is connected to the top of the cemented carbide substrate 2; the auxiliary core 4 passes through the center of the inner wall B 312.

[0021] The inner wall A 322 is connected to the side of the auxiliary core 4; the inner wall B 312 is connected to the inner wall of the cemented carbide substrate 2; the inner wall A 322 and the inner wall B 312 overlap; in this way, the auxiliary core 4 is easily stuck on the upper end of the inner wall B 312 and is not easy to fall off.

[0022] The outer diameter of the auxiliary core 4 is less than the inner diameter of the mounting hole; after synthesis, fast and low-cost drilling with an ordinary drill bit can only remove the auxiliary core 4 as much as possible, and the size requirement of the mounting hole cannot be met; therefore, it is also necessary to use discharge / wire cutting / laser to fine-process the mounting hole after drilling the auxiliary core 4. Compared with the existing synthesis method, the difficulty has been reduced a lot, and the efficiency and processing quality are also guaranteed, thereby improving the wear resistance of the mounting hole.

[0023] The auxiliary core 4 can also be obtained by mixing, pressing and sintering magnesium oxide powder; the auxiliary core 4 material is magnesium oxide powder and 2% to 3% sodium silicate, because the melting point of magnesium oxide is 2852°C.

[0024] In this embodiment, the auxiliary core 4 is not in direct contact with the diamond powder 1, so there is no need to worry about the magnesium oxide powder and the diamond powder 1 being mixed and affecting the purity of the synthetic diamond material.

[0025] Example 3: See Figure 3, Embodiment 3 is basically the same as Embodiment 2, and the similarities are not repeated here. The differences are as follows: the metal cup also includes a cup body B 33; the cup body B 33 includes a circular bottom plate 331 and an annular outer wall 332; the lower end of the annular outer wall 332 is connected to the outer edge of the circular bottom plate 331; the annular outer wall 332 is abutted against the outer wall of the cup body A 32; the top of the circular bottom plate 331 is connected to the bottom of the cup body A 32 to prevent the auxiliary core 4 from falling.

[0026] Example 4: See Figure 4 The fourth embodiment is basically the same as the third embodiment, and the similarities are not repeated here. The difference is that the buckle cover 31 is a circular cover body, which is inverted on the top of the cemented carbide substrate 2.

[0027] Example 5: See Figure 5 A method for synthesizing an assembly used for synthesizing a composite sheet with intermediate holes according to the first embodiment comprises the following steps: ①Prepare raw materials The auxiliary core 4 is vertically inserted into the center of the cup body armor 32; the binder and the diamond powder 1 are mixed evenly; an appropriate amount of the diamond powder 1 mixed with the binder is selected and placed at the bottom of the cup body armor 32; the cemented carbide substrate 2 is sleeved outside the auxiliary core 4, placed inside the cup body armor 32, and pressed on the mixed diamond powder 1; in this way, the upper section of the auxiliary core 4 supports the cemented carbide substrate 2 during high temperature and high pressure synthesis, and the lower end supports the synthesized diamond, which can avoid deformation and maintain the basic shape of the installation hole; the buckle cover 31 is buckled on the top of the cup body armor 32 and connected to the top of the cemented carbide substrate 2; ②High temperature and high pressure synthesis Put the prepared raw materials into the pyrophyllite block to form a synthetic block; the pyrophyllite block has heating devices, pressure transmission devices, heat conduction devices, etc. inside to facilitate high temperature and high pressure synthesis; put the synthetic block into a six-sided top press for high temperature and high pressure synthesis; the synthesis pressure is 5.5~7.5GPa, and the synthesis temperature is 1450~1550℃; the auxiliary core 4 supports the metal cup to ensure the formation of the composite sheet; the metal cup ensures that the diamond powder is formed and connected to the cemented carbide bottom; ③Machining The synthetic block is taken out and the talc block is peeled off; the outer metal cup is peeled off by sandblasting to expose the internal composite sheet body; the outer circle of the composite sheet is ground until the outer diameter of the composite sheet reaches the outer diameter of the finished composite sheet; the top of the composite sheet is plane-ground until the height of the composite sheet reaches the height of the finished composite sheet; the auxiliary core 4 is drilled to form a mounting hole; because the auxiliary core 4 is much less difficult to process than the diamond layer or cemented carbide, the cutting cost of the mounting hole is reduced and the processing efficiency is improved.

[0028] Example 6: See Figure 6-Figure 8The sixth embodiment is basically the same as the fifth embodiment, and the similarities are not repeated here. The difference is that the assembly used for the synthetic intermediate hole composite sheet described in any one of the second, third, and fourth embodiments is used.

[0029] In step ③, after drilling the auxiliary core 4 part, the mounting hole is finely processed by using discharge / wire cutting / laser. Compared with the existing synthesis method, the difficulty has been greatly reduced, the efficiency and processing quality are also guaranteed, and the wear resistance of the mounting hole is improved.

Claims

1. An assembly for synthesizing a composite sheet with a middle hole, characterized in that: It includes a metal cup and an auxiliary core; the metal cup includes a buckle cover and a cup body armor matched with a cemented carbide substrate; the cup body armor contains diamond micropowder mixed with a binder and a cemented carbide substrate from bottom to top; the cemented carbide substrate is in a circular ring shape; the auxiliary core is a columnar body corresponding to the mounting hole, and passes through the cemented carbide substrate and the axis of the diamond micropowder layer from top to bottom; the auxiliary core is made of a high melting point metal; the buckle cover is buckled on the top of the cup body armor and connected to the top of the cemented carbide substrate.

2. The assembly for the synthetic intermediate holed composite sheet according to claim 1, characterized in that: The cup body armor includes a circular bottom plate, an inner wall armor and an outer wall armor; the bottom ends of the inner wall armor and the outer wall armor are respectively connected to the inner edge and the outer edge of the circular bottom plate; the bottom of the diamond micropowder mixed with a binder is connected to the circular bottom plate; the top of the outer wall armor is higher than the top of the inner wall armor.

3. The assembly for the synthetic intermediate holed composite sheet according to claim 2, characterized in that: The buckle cover comprises a circular top plate, an inner wall B and an outer wall B; the top of the inner wall B and the top of the outer wall B are respectively connected with the inner edge and the outer edge of the circular bottom plate; the bottom of the circular top plate is connected with the top of the cemented carbide substrate.

4. The assembly for the synthetic intermediate holed composite sheet according to claim 2 or 3, characterized in that: The metal cup also includes cup body B; the cup body B includes a circular bottom plate and an annular outer wall; the lower end of the annular outer wall is connected to the outer edge of the circular bottom plate; the annular outer wall is abutted against the outer wall of the cup body A; the top of the circular bottom plate is connected to the bottom of the cup body A.

5. The assembly for the synthetic intermediate holed composite sheet according to claim 1, characterized in that: The outer diameter of the auxiliary core is greater than the inner diameter of the mounting hole.

6. A method for synthesizing an assembly for synthesizing a composite sheet with intermediate holes according to claim 1, characterized in that: The following steps are involved: ①Prepare raw materials Insert the auxiliary core vertically into the center of the cup body armor; Mix the binder and diamond micropowder evenly; Select an appropriate amount of diamond micropowder mixed with the binder and put it into the bottom of the cup body armor; Put the cemented carbide matrix outside the auxiliary core, put it into the cup body armor, and press it on the mixed diamond micropowder; Put the buckle cover on the top of the cup body armor and connect it with the top of the cemented carbide matrix; ②High temperature and high pressure synthesis Put the prepared raw materials into the pyrophyllite block to form a synthetic block; put the synthetic block into a six-sided top press for high temperature and high pressure synthesis; ③Machining The composite block is taken out and the pyrophyllite block is peeled off; the external metal cup is peeled off by sandblasting; the outer circle of the composite sheet is ground until the outer diameter of the composite sheet reaches the outer diameter of the finished composite sheet; the top of the composite sheet is plane-ground until the height of the composite sheet reaches the height of the finished composite sheet; the auxiliary core part is drilled to form a mounting hole.

7. The synthesis method according to claim 6, characterized in that: The outer diameter of the auxiliary core is less than the inner diameter of the mounting hole; in step ③, after drilling the auxiliary core part, the mounting hole is finely processed using discharge / wire cutting / laser.

Images