Large-diameter composite sheet assembly structure

Abstract

The utility model discloses a kind of large-diameter composite sheet assembly structures, belong to tool composite sheet processing device technical field, including talcose sealing block, synthetic cavity is equipped in the talcose sealing block, the middle part position of synthetic cavity is equipped with carbon tube, the middle part position of carbon tube is equipped with heat conduction sheet, heat conduction sheet is symmetrically equipped with first carbon sheet, composite sheet combination mechanism, second carbon sheet, heat insulation sheet, titanium sheet and plug mechanism in two directions of up and down, first carbon sheet, composite sheet combination mechanism and second carbon sheet are arranged in the cavity of carbon tube.The utility model increases heat conduction in synthetic cavity high temperature area and enhances heat insulation in low temperature area, can improve and solve synthetic cavity temperature gradient effectively solve the problem that large-diameter composite sheet synthetic cavity body temperature gradient is big.

Description

Technical Field

[0001] This utility model relates to the technical field of tool composite sheet processing device, specifically to a large-diameter composite sheet assembly structure. Background Technology

[0002] The use of composite sheets for cutting tools (PCD, PCBN) has been increasing year by year, with both domestic usage and export volume showing double-digit growth. However, for high-end composite sheet products, especially large-diameter composite sheets, China still relies heavily on imports. The main reason is that the performance stability of domestically produced large-diameter composite sheets varies, with significant performance differences between the edges and the middle area of ​​the composite sheet.

[0003] The performance difference between the edge and middle regions of the composite sheet is related to the pressure and temperature gradients of the synthesis chamber. Since the adoption of molten salt materials in domestic synthesis technology, the salt melts into a liquid under high temperature and pressure, enabling the synthesis chamber to reach an isostatic pressure state, and the pressure gradient problem of the synthesis chamber has been significantly improved. However, the temperature gradient problem in the synthesis chamber has not been improved enough. In particular, with the increasing size of presses, the Ø650 cylinder diameter press is already in the stage of being phased out, the Ø850 cylinder diameter press is currently the main model (producing composite sheets with a diameter of about Ø60), the Ø950-Ø1050 cylinder diameter press (producing composite sheets with a diameter of about Ø70) has been mass-produced, and the Ø1200-Ø1500 cylinder diameter press (producing composite sheets with a diameter of Ø80 and above) has entered the research and development stage. It is foreseeable that the temperature gradient in the chamber will continue to increase during the expansion of the synthesis chamber, and improving and solving the temperature gradient of large-diameter composite sheets has become an important issue.

[0004] This invention discloses a large-diameter composite sheet assembly structure, employing an Ø850 cylinder diameter to synthesize composite sheets with a diameter of approximately Ø60. Innovations are made in assembly structure design, material selection, and process methods. The high-temperature zone of the synthesis chamber is enhanced with increased heat conduction, and the low-temperature zone with improved insulation, thus improving and resolving the temperature gradient within the synthesis chamber. The selection and manufacturing of the diamond-copper thermal conductive component utilizes the initial high-temperature, high-pressure synthesis process to complete the diamond-copper sintering, effectively leveraging the high thermal conductivity of diamond-copper. The simplification of the complex diamond-copper manufacturing process is a key innovation, simplifying and optimizing the manufacturing process for diamond-copper and large-diameter composite sheets, and providing a reference for the synthesis of even larger composite sheets. Utility Model Content

[0005] To address the issue of large temperature gradients in the synthesis cavity of large-diameter composite sheets, this invention provides a large-diameter composite sheet assembly structure.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A large-diameter composite sheet assembly structure includes a pyrophyllite sealing block, a synthesis cavity inside the pyrophyllite sealing block, a carbon tube in the middle of the synthesis cavity, a heat-conducting plate in the middle of the carbon tube, and a first carbon sheet, a composite sheet assembly mechanism, a second carbon sheet, a heat insulation plate, a titanium sheet, and a plug mechanism symmetrically arranged in two directions above and below the heat-conducting plate. The first carbon sheet, the composite sheet assembly mechanism, and the second carbon sheet are located inside the cavity of the carbon tube.

[0007] The pyrophyllite sealing block is composed of an upper sealing block and a lower sealing block arranged symmetrically. The inner wall of the contact side of the upper sealing block and the lower sealing block is provided with an annular groove. A dolomite tube is provided in the annular groove. A carbon tube and a salt tube are arranged in sequence inside the dolomite tube.

[0008] The heat-conducting sheet has a sandwich structure, with a diamond layer in the middle and copper alloy layers on both sides. The thickness of the diamond layer is 100-500 micrometers, preferably 200-300 micrometers, and the copper alloy layer is a copper-boron alloy layer with a boron content of 0.8%.

[0009] The composite sheet assembly includes a cubic boron nitride layer and a cemented carbide portion. The cubic boron nitride layer is located on the side close to the heat-conducting sheet, and a gasket is provided on the outside of the cemented carbide portion. A metal cup is fitted over the cubic boron nitride layer.

[0010] The heat insulation sheet is a circular sheet structure, consisting of a graphite sheet and a dolomite ring or magnesium oxide ring surrounding the graphite sheet.

[0011] The plug mechanism includes a plug, a pyrophyllite sheet, and a dolomite sheet. The plug has a T-shaped structure, and the pyrophyllite sheet and the dolomite sheet are annular pieces, respectively fitted around the central protrusion of the plug. The dolomite sheet is located on the side closer to the heat-conducting plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention, by placing a heat-conducting component at the center of the composite sheet assembly structure and heat-insulating components at both ends, ensures that the radial temperature gradient of the composite sheet within the synthesis chamber is less than 20 degrees Celsius, thanks to the heat-conducting component. This maintains essentially the same product performance between the edge and center regions of the large-diameter composite sheet, with a difference within 8%, which is considered equivalent within the testing error range. The heat-insulating components reduce heat dissipation in areas near the plug, and the adjustable resistivity and size of the carbon sheet in the middle of the heat-insulating component allow for appropriate matching of resistance to heat generation, balancing with the heat dissipation from the plug. This keeps the axial temperature of the synthesis chamber within a small range, effectively solving the problem of large temperature gradients in the synthesis chamber of large-diameter composite sheets. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the large-diameter composite sheet assembly structure of this utility model; Figure 2 This is a cross-sectional view of the composite sheet assembly mechanism in this utility model; Figure 3 This is a cross-sectional view of the heat-conducting sheet in this utility model; Figure 4 This is a cross-sectional view of the heat insulation sheet in this utility model; Figure 5 This is a C-scan interface diagram of the synthesized product in the embodiment; Figure 6 The image shows the C-scan thickness map of the synthesized product in the example.

[0014] In the diagram, 1. Pyrophyllite sealing block, 1-1. Upper sealing block, 1-2. Lower sealing block, 2. Plug, 3. Titanium sheet, 4. Pyrophyllite sheet, 5. Dolomite sheet, 6. Insulation sheet, 7. Salt tube, 8. Heat-conducting sheet, 8-1. Diamond layer, 8-2. Copper alloy layer, 9. First carbon sheet, 10. Cubic boron nitride layer, 11. Metal cup, 12. Carbon tube, 13. Gasket, 14. Second carbon sheet, 15. Hard alloy part, 16. Dolomite tube. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The cooling water pipe installation and connection structure involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] like Figure 1-6 As shown, this embodiment provides a large-diameter composite sheet assembly structure. Large diameter generally refers to a composite sheet diameter of Ø50mm or more. It includes a pyrophyllite sealing block 1, a synthesis cavity inside the pyrophyllite sealing block 1, a carbon tube 12 in the middle of the synthesis cavity, a heat-conducting plate 8 in the middle of the carbon tube 12, and a first carbon sheet 9, a composite sheet assembly mechanism, a second carbon sheet 14, a heat insulation plate 6, a titanium sheet 3, and a plug mechanism symmetrically arranged in two directions above and below the heat-conducting plate 8. The first carbon sheet 9, the composite sheet assembly mechanism, and the second carbon sheet 14 are located inside the cavity of the carbon tube 12.

[0017] Among them, the pyrophyllite sealing block 1 is composed of an upper sealing block 1-1 and a lower sealing block 1-2 arranged symmetrically. The inner wall of the contact side of the upper sealing block 1-1 and the lower sealing block 1-2 is provided with an annular groove. A dolomite tube 16 is provided in the annular groove. A carbon tube 12 and a salt tube 7 are arranged in sequence inside the dolomite tube 16.

[0018] The heat-conducting sheet 8 has a sandwich structure, with a diamond layer 8-1 in the middle and copper alloy layers 8-2 on both sides. The thickness of the diamond layer 8-1 is 100-500 micrometers, preferably 200-300 micrometers. The copper alloy layer 8-2 is a copper-boron alloy layer with a boron content of 0.8%. The thermal conductivity of the diamond layer 8-1 is 2200W / MK, and the thermal conductivity of the copper alloy is 400W / MK.

[0019] The heat-conducting sheet 8 has a thickness ranging from 0.3 to 1.0 mm. The diamond layer 8-1 is located in the middle layer of the sandwich structure. The volume ratio of diamond in the middle layer is 60-80%, and its particle size is 100-500 micrometers. It uses native equal-volume diamond with a purity of ≥99.99%. The copper alloy layer 8-2 is located on the outer side of the sandwich structure. The copper sheet is made of copper-boron alloy with a boron content of 0.5-3%. The thickness of the copper sheet is 0.6-0.9 times the average particle size of the diamond.

[0020] The heat-conducting sheet 8 is pressed using an ultrasonic cold-pressing device, with an ultrasonic frequency range of 20000-50000 Hz and a cold-pressing pressure of 30-50 MPa. The manufacturing steps are as follows: 1. Preparation of copper foil and diamond: Select 4-inch copper foil (with matching 4-inch cold pressing mold).

[0021] 2. Place a 4-inch flat copper foil at the bottom of the cold pressing mold in step 1, and then place a diamond of a set weight on it.

[0022] 3. After preparing in step 2, turn on ultrasonic vibration to evenly disperse the diamond.

[0023] 4. After preparing in step 3, place copper foil on top of the diamond and perform low-pressure cold pressing at 3 MPa for 3 seconds. Then, start ultrasonic cold pressing to a final pressure of approximately 40 MPa. This yields a sandwich diamond-copper alloy cold-pressed sheet.

[0024] 5. Based on the required diamond-copper alloy dimensions for the large-diameter composite sheet, cut the diamond-copper alloy obtained in step 4 to obtain the heat-conducting component.

[0025] The diamond-copper alloy thermal conductive component is not sintered during cold pressing, but sintered in the early stage of the composite sheet synthesis process, and its high thermal conductivity is then utilized. The synthesis process is short, with heating time of 10-15 minutes (general synthesis time is 20-30 minutes), pressure of 5-6.5 GPa, temperature of 1300-1450 degrees Celsius, and low power consumption.

[0026] The composite sheet assembly includes a cubic boron nitride layer 10 and a cemented carbide portion 15. The cubic boron nitride layer 10 is located on the side close to the heat-conducting sheet 8. A gasket 13 is provided on the outside of the cemented carbide portion 15. A metal cup 11 is fitted over the cubic boron nitride layer 10.

[0027] Among them, the heat insulation sheet 6 has a circular structure, which is composed of a graphite sheet and a dolomite ring or magnesium oxide ring surrounding the graphite sheet.

[0028] The plug mechanism includes a plug 2, a pyrophyllite plate 4, and a dolomite plate 5. The plug 2 has a T-shaped structure, and the pyrophyllite plate 4 and the dolomite plate 5 are ring-shaped pieces, respectively fitted around the middle protrusion of the plug 2. The dolomite plate 5 is located on the side close to the heat-conducting plate 8.

[0029] The 5820PCBN, synthesized using the large-diameter composite sheet assembly structure of this embodiment, has a diameter of 58mm, a thickness of 20mm, and a composite layer thickness of 2.0mm. The composite sheet edge region has a viscosity (HV) of 3986, while the central region has an HV of 3805, a difference of approximately 4.7%. The tool life difference is 6.3%. Other product testing is the same. The C-scan image of product 5820PCBN is shown below. Figure 5 and Figure 6 .

[0030] Finally, it should be noted that the accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

Claims

1. A large-diameter composite sheet assembly structure, comprising a pyrophyllite sealing block, characterized in that: The pyrophyllite sealing block is provided with a synthesis chamber. A carbon tube is provided in the middle of the synthesis chamber. A heat-conducting plate is provided in the middle of the carbon tube. The heat-conducting plate is symmetrically provided with a first carbon plate, a composite plate combination mechanism, a second carbon plate, a heat insulation plate, a titanium plate, and a plug mechanism in two directions. The first carbon plate, the composite plate combination mechanism, and the second carbon plate are located in the cavity of the carbon tube.

2. The large-diameter composite sheet assembly structure according to claim 1, characterized in that: The pyrophyllite sealing block is composed of an upper sealing block and a lower sealing block arranged symmetrically. The inner wall of the contact side of the upper sealing block and the lower sealing block is provided with an annular groove. A dolomite tube is provided in the annular groove. A carbon tube and a salt tube are arranged in sequence inside the dolomite tube.

3. The large-diameter composite sheet assembly structure according to claim 1, characterized in that: The heat-conducting sheet has a sandwich structure, with a diamond layer in the middle and copper alloy layers on both sides. The thickness of the diamond layer is 100-500 micrometers, and the copper alloy layer is a copper-boron alloy layer.

4. The large-diameter composite sheet assembly structure according to claim 1, characterized in that: The composite sheet assembly includes a cubic boron nitride layer and a cemented carbide portion. A gasket is provided on the outside of the cemented carbide portion. The cubic boron nitride layer is located on the side close to the heat-conducting sheet. A metal cup is wrapped around the cubic boron nitride layer.

5. The large-diameter composite sheet assembly structure according to claim 1, characterized in that: The heat insulation sheet has a circular structure, consisting of a graphite sheet and a dolomite ring or magnesium oxide ring surrounding the graphite sheet.

6. The large-diameter composite sheet assembly structure according to claim 1, characterized in that: The plug mechanism includes a plug, a pyrophyllite plate, and a dolomite plate. The plug has a T-shaped structure, and the pyrophyllite plate and the dolomite plate are annular plates, respectively fitted around the middle protrusion of the plug. The dolomite plate is located on the side closer to the heat-conducting plate.

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