Pre-thinned diamond compact
By using pre-thinning structure and segmented thinning alloy methods in diamond composite sheets, the problem of diamond composite sheets being easily bent after the cemented carbide is thinned, and the flatness and cost-effectiveness of the product are improved.
Patent Information
- Application Number
- CN202421736123.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-07-22
AI Technical Summary
Existing diamond composite sheets are prone to bending after the cemented carbide is thinned, resulting in a large deviation in the thickness of the center and surroundings of the processed diamond composite sheets.
The pre-thinned diamond composite sheet structure is adopted, including the first metal cup, the second metal cup and the multi-layer structure of the cemented carbide and diamond layer. The thicker alloy is used to ensure the flatness of the product by thinning the alloy in the segment, and the metal cup is removed in subsequent processing to achieve the production of the finished product.
During the synthesis and processing process, the bending and dimensional deviation of the product are avoided, and the cost loss of alloy thinning processing is reduced, and the reuse of the second cemented carbide is realized, reducing production costs.
Smart Images
Figure CN222536487U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of superhard materials, in particular to a pre-thinned diamond composite sheet. Background Art
[0002] Diamond composite sheets have the characteristics of high wear resistance and high thermal conductivity of diamond, and also have the advantages of high impact resistance and good welding performance of cemented carbide. In view of the above advantages, a large number of cutting tool products on the market are currently replacing the cutting edges with diamond composite sheets, so as to achieve the processing of high-hardness materials and precision materials. The resulting workpieces have the advantages of high surface finish, low thermal damage, and good processing dimensional stability. The service life of the tool itself is also significantly improved compared with traditional products.
[0003] At present, diamond composite sheet tools often need to thin their carbide parts, then cut into different shapes and combine with the corresponding tool bodies through welding. In actual production, alloy thinning not only wastes time and materials, but more importantly, when the alloy thickness is gradually thinned, the strong internal stress generated by the difference in expansion coefficients between diamond and carbide will cause obvious bending of the entire composite sheet, resulting in a large deviation in thickness between the center and the surrounding of the final processed diamond composite sheet, and no normal processing tool; and if a thin layer of alloy is selected during synthesis, the flatness of the product will be more difficult to guarantee due to the greater pressure during synthesis, resulting in the complete scrapping of the product. Utility Model Content
[0004] The utility model provides a pre-thinned diamond composite sheet, which solves the problem that the existing diamond composite sheet blade alloy is prone to obvious bending after being thinned.
[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:
[0006] A pre-thinned diamond composite sheet includes a first metal cup and a second metal cup, wherein the first metal cup is placed in the second metal cup, wherein a compacted diamond powder layer, a first hard alloy layer and a first protective sheet are arranged in the first metal cup, wherein a bending portion is arranged on the upper part of the first metal cup, wherein the bending portion is provided with grooves of equal width and equal distance so that the bending portion is flatly folded above the first protective sheet, wherein a filling sheet is arranged above the first protective sheet except for the bending portion; an isolation layer, a second protective sheet and a second hard alloy layer are arranged above the bending portion and the filling sheet, wherein a third metal cup is inverted outside the second hard alloy. The side wall of the second metal cup is tightly sleeved outside the first metal cup, and the third metal cup is tightly sleeved outside the second metal cup.
[0007] Among them, the first protective sheet and the second protective sheet are zirconium sheets, molybdenum sheets, niobium sheets, tantalum sheets or iron sheets; the isolation layer is a molybdenum disulfide layer, a hexagonal boron nitride layer, a graphite layer or a mica layer; the first cemented carbide layer and the second cemented carbide layer are tungsten carbide cobalt alloy layers.
[0008] Wherein, the thickness of the first cemented carbide is 0.8-2.5 mm, and the thickness of the second cemented carbide is 2-25 mm.
[0009] The width of the groove is 0.2-1 mm, the depth is 0.1-0.8 mm, and there are 3-8 grooves evenly distributed along the circumference.
[0010] The utility model provides a pre-thinned diamond composite sheet, which has the following beneficial effects:
[0011] In the thinned diamond assembly composite sheet of the utility model, the alloy is segmented, so that the thicker alloy can be used to ensure the overall flatness of the product during the synthesis and processing, avoiding processing size deviation caused by product arching and bending, and greatly reducing various cost losses caused by alloy thinning processing; in the subsequent processing process, the second alloy can be removed as a whole, and the second alloy can be reused, further reducing the production cost of the diamond composite sheet. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is a cross-sectional view of the diamond powder layer, the first hard alloy, and the first protective sheet in the first metal cup;
[0013] Figure 2 is a three-dimensional schematic diagram of a first metal cup;
[0014] Figure 3 is a cross-sectional schematic diagram of the first metal cup after packaging;
[0015] Figure 4 for Figure 3 A top view of
[0016] Figure 5 This is a schematic cross-sectional view of the composite sheet after assembly.
[0017] In the figure, 1. diamond powder layer, 2. first cemented carbide layer, 3. first metal cup, 3-1. bending part, 3-2. groove, 4. first protective sheet, 5. filling sheet, 6. isolation layer, 7. second protective sheet, 8. second cemented carbide layer, 9. second metal cup, 10. third metal cup. DETAILED DESCRIPTION
[0018] 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.
[0019] like Figure 1-Figure 5 As shown, this embodiment provides a pre-thinned diamond composite sheet, including a first metal cup 3 and a second metal cup 9, the first metal cup 3 is placed in the second metal cup 9, and a compacted diamond powder layer 21, a first hard alloy layer and a first protective sheet 4 are arranged in the first metal cup 3, a bending portion 3-1 is arranged on the upper part of the first metal cup 3, and the bending portion 3-1 is provided with grooves 3-2 of equal width and equal distance so that the bending portion 3-1 is folded flat above the first protective sheet 4, and a filling sheet 5 is arranged above the first protective sheet 4 except the bending portion 3-1; an isolation layer 6, a second protective sheet 7 and a second hard alloy layer 8 are arranged above the bending portion 3-1 and the filling sheet 5, and a third metal cup 10 is inverted outside the second hard alloy. The side wall of the second metal cup 9 is tightly sleeved outside the first metal cup 3, and the third metal cup 10 is tightly sleeved outside the second metal cup 9.
[0020] Among them, the first protective sheet 4 and the second protective sheet 7 are zirconium sheets, molybdenum sheets, niobium sheets, tantalum sheets or iron sheets; the isolation layer 6 is a molybdenum disulfide layer, a hexagonal boron nitride layer, a graphite layer or a mica layer; the first cemented carbide layer and the second cemented carbide layer 8 are tungsten carbide cobalt alloy layers.
[0021] The thickness of the first cemented carbide is 0.8-2.5 mm, and the thickness of the second cemented carbide is 2-25 mm.
[0022] The width of the groove 3-2 is 0.2-1 mm, the depth is 0.1-0.8 mm, and there are 3-8 grooves evenly distributed along the circumference.
[0023] The subsequently processed diamond composite sheet is made by grinding the pre-thinned diamond composite sheet assembled above after high temperature and high pressure synthesis, and includes a diamond micro powder layer and a first hard alloy layer.
[0024] The assembly method of the assembled pre-thinned diamond composite sheet is:
[0025] 1) Diamond powder, first hard alloy, and first protective sheet 4 are sequentially placed in the first metal cup 3, wherein the diamond powder needs to be compacted after being placed in;
[0026] 2) The side wall of the first metal cup 3 that is higher than the first protective sheet 4 is pressed inward to make it contact with the first protective sheet 4, and a filling sheet 5 is placed on the upper part of the first protective sheet 4;
[0027] 3) Put the first metal cup 3 and its wrapping, the isolation layer 6, the second protective sheet 7, and the second hard alloy into the second metal cup 9 in sequence;
[0028] 4) Insert the second metal cup 9 into the third metal cup 10 from above the second cemented carbide, and the resulting assembly can be placed in a synthesis chamber for high temperature and high pressure synthesis.
[0029] The subsequent processing methods of pre-thinned diamond composite sheets are:
[0030] 1) Remove the metal cup on the diamond side of the synthesized rough composite sheet by sandblasting;
[0031] 2) Grind and polish the side of the diamond layer according to the finished product requirements;
[0032] 3) removing the metal cup wrapped around the second cemented carbide by external cylindrical grinding, so as to separate the second cemented carbide from the first metal cup 3;
[0033] 4) The metal cup and the protective sheet at the bottom of the first alloy are removed by end surface grinding to obtain a finished diamond composite sheet.
[0034] The pre-thinned diamond composite sheet ensures the flatness of the product during synthesis; it avoids dimensional deviation caused by product aerodynamic deformation during processing, and reduces the cost waste caused by cemented carbide thinning; the second cemented carbide can be completely recovered after processing for secondary use, further reducing the production cost of the product.
[0035] 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 pre-thinned diamond composite sheet, characterized in that: The invention comprises a first metal cup and a second metal cup, wherein the first metal cup is placed in the second metal cup, wherein a compacted diamond powder layer, a first hard alloy layer and a first protective sheet are arranged in the first metal cup, wherein a bending portion is arranged on the upper part of the first metal cup, wherein the bending portion is arranged with grooves of equal width and equal distance so that the bending portion is folded flat above the first protective sheet, wherein a filling sheet is arranged above the first protective sheet in addition to the bending portion; an isolation layer, a second protective sheet and a second hard alloy layer are arranged above the bending portion and the filling sheet, and a third metal cup is inverted outside the second hard alloy.
2. A pre-thinned diamond composite sheet according to claim 1, characterized in that: The first protection sheet and the second protection sheet are zirconium sheets, molybdenum sheets, niobium sheets, tantalum sheets or iron sheets.
3. The pre-thinned diamond composite sheet according to claim 1, characterized in that: The isolation layer is a molybdenum disulfide layer, a hexagonal boron nitride layer, a graphite layer or a mica layer.
4. The pre-thinned diamond composite sheet according to claim 1, characterized in that: The first cemented carbide layer and the second cemented carbide layer are tungsten carbide cobalt alloy layers.
5. The pre-thinned diamond composite sheet according to claim 1, characterized in that: The thickness of the first hard alloy is 0.8-2.5 mm, and the thickness of the second hard alloy is 2-25 mm.
6. The pre-thinned diamond composite sheet according to claim 1, characterized in that: The width of the groove is 0.2-1 mm, the depth is 0.1-0.8 mm, and 3-8 grooves are evenly distributed along the circumference.