Concave hemispherical metal superhard grinding wheel forming die and sintering die
By combining the concave upper pressure block and the convex lower pressure block, along with the support and pressure ring, the problems of uniformity and density of the abrasive layer are solved, costs are reduced, production efficiency is improved, and the quality of the grinding wheel is ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 赛扬精工(扬州)有限公司
- Filing Date
- 2025-06-06
- Publication Date
- 2026-06-12
AI Technical Summary
Existing concave hemispherical metal superhard grinding wheel forming molds cannot be positioned during the sintering of the abrasive layer and the substrate, resulting in poor uniformity and uneven density of the abrasive layer, and requiring a large allowance for re-grinding, which increases costs.
The upper pressing block with an inwardly concave arc structure and the lower pressing block with an outwardly convex arc structure, combined with a support, a core rod and a pressure ring, form a mold cavity or mold cavity to achieve uniform distribution and density of the abrasive layer. Through the combination of step-by-step pressing and sintering mold, the substrate is avoided from directly participating in the pressing.
This achieves uniformity and density of the abrasive layer, reduces raw material waste and processing costs, improves production efficiency, and ensures grinding wheel quality.
Smart Images
Figure CN224346948U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of grinding wheel forming mold technology, and in particular to a concave hemispherical metal superhard grinding wheel forming mold and sintering mold. Background Technology
[0002] Metal superhard grinding wheels are grinding wheels made using metal powder as the main binder and diamond or cubic boron nitride as the abrasive. Due to their high strength and wear resistance, they can ensure high-precision shape and size, and have a relatively long service life, so they are widely used in the precision machining of various materials, such as cutting tools, gemstones, automotive parts, and photovoltaic semiconductors.
[0003] With the rapid development of science and technology, the requirements for grinding wheels in material processing are becoming increasingly stringent, especially for irregularly shaped superhard metal grinding wheels, which require high precision in dimensions and radius (R-angle). Current production methods typically involve sintering the abrasive layer and substrate together into a planar structure, then using electrical discharge machining (EDM) to process the wheel's shape and contour. This not only significantly increases material and processing costs but also makes it difficult to guarantee the wheel's contour accuracy. To reduce costs, existing technology designs the forming die's pressure head as a hemispherical structure, then sintersects the abrasive layer and substrate together into a concave hemispherical structure. However, since the abrasive layer lacks a central hole, it cannot be positioned as a center support, nor can it guarantee uniform material feeding. Furthermore, if the abrasive layer and substrate are directly sintered together, the abrasive layer is subjected to unidirectional pressure, leading to uneven density in the grinding wheel. Cracks easily appear in areas where pressure cannot be transmitted, affecting the overall quality of the grinding wheel. Therefore, to address these problems and technical requirements, it is necessary to improve the existing concave hemispherical metal superhard grinding wheel forming die. Summary of the Invention
[0004] The purpose of this utility model is to provide a concave hemispherical metal superhard grinding wheel forming mold and sintering mold. It has a simple structure and strong practicality. It can effectively avoid the large allowance grinding of concave hemispherical grinding wheels, solve the problems of material waste and increased cost in the prior art, improve production efficiency, and ensure the density of the abrasive layer structure and the quality of the grinding wheel by pressing without a matrix.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A concave hemispherical metal superhard grinding wheel forming mold includes a mold frame and an upper pressure block and a lower pressure block located within the mold frame; the upper pressure block is located above the lower pressure block; the side of the upper pressure block in contact with the abrasive layer has a concave arc-shaped structure; the side of the lower pressure block in contact with the abrasive layer has an outward convex arc-shaped structure; the upper pressure block includes a support and a mandrel; the inner sidewall of the mold frame has a stepped structure; the upper part of the support extends outward to form a lug; the lug is located on the stepped structure; the height of the stepped structure is the same as the height of the lug; a pressure ring may or may not be fitted on the lower pressure block.
[0007] In this invention, when a pressure ring is fitted onto the lower pressure block, a mold cavity is formed between the mold frame, upper pressure block, lower pressure block, and pressure ring to hold the powder raw material and form a hollow hemispherical abrasive layer blank. When no pressure ring is fitted onto the lower pressure block, a mold cavity is formed between the mold frame, upper pressure block, and lower pressure block to hold the powder raw material and form a hollow hemispherical abrasive layer blank. Whether or not a pressure ring is fitted onto the upper pressure block is optional and depends on the hollow hemispherical abrasive layer blank to be prepared, and does not affect the understanding of the technical effect of this invention by those skilled in the art.
[0008] Furthermore, the lower pressure block and the pressure ring are either separate structures or an integral structure.
[0009] Furthermore, when the pressure ring is fitted onto the lower pressure block, the outer wall of the support and the outer wall of the pressure ring are in close contact with the inner wall of the mold frame, and the lower end face of the mold frame, the lower end face of the pressure ring, and the lower end face of the lower pressure block are flush.
[0010] Furthermore, when the pressure ring is not fitted on the lower pressure block, the outer wall of the support and the outer wall of the lower pressure block are in contact with the inner wall of the mold frame, and the lower end face of the mold frame is flush with the lower end face of the lower pressure block.
[0011] Furthermore, the mandrel is located inside the support; the outer wall of the mandrel is in close contact with the inner wall of the support; the upper end face of the mold frame, the upper end face of the support, and the upper end face of the mandrel are flush. The support and the mandrel are separate structures, which facilitates material feeding; the flushness of the upper end face of the mold frame, the upper end face of the support, and the upper end face of the mandrel ensures stability when the molding die is inverted for pressing.
[0012] Furthermore, the lower pressure block includes a first pressure head and a second pressure head; the first pressure head is located on the second pressure head; the first pressure head has a spherical crown structure; the second pressure head has a columnar structure. More preferably, the first pressure head and the second pressure head are an integral structure. The first pressure head contacts the powder raw material and cooperates with the upper pressure block, allowing the powder raw material to be directly formed into a hollow hemispherical abrasive layer blank, eliminating the need for subsequent large-scale grinding and reducing material and processing costs.
[0013] Preferably, when a pressure ring is fitted onto the pressing block, a washer is provided on the outer side of the pressure ring, a pad is provided below the washer, the mold frame is located on the washer, the second pressing head is 0.2~1mm higher than the pressure ring, and the height of the washer is less than the height of the pressure ring; when a pressure ring is not fitted onto the pressing block, a washer is provided on the outer side of the second pressing head, a pad is provided below the washer, the mold frame is located on the washer, and the height of the washer is less than the height of the second pressing head.
[0014] In this invention, the washer is used to elevate the mold frame, thereby increasing the distance between the upper and lower pressure blocks, ensuring that the abrasive layer blank has a uniform distribution and tight bonding during the pressing process; after feeding, the forming mold is inverted as a whole, and by setting a pad, the operator can easily flip the forming mold; after the forming mold is inverted, the washer is removed, and the forming mold is pressed in a conventional manner to obtain the abrasive layer blank.
[0015] In this invention, the lower end face of the support is flush with the lower end face of the first pressure head, and the second pressure head is 0.2~1mm higher than the pressure ring, which can prevent the support and the pressure ring from colliding during pressing and damaging the mold. More preferably, the second pressure head is 0.4~0.8mm higher than the pressure ring.
[0016] A concave hemispherical metal superhard grinding wheel sintering mold includes a mold ring, a lower pressure block, and a substrate. The side of the lower pressure block that contacts the abrasive layer has an outwardly convex arc-shaped structure; the side of the substrate that contacts the abrasive layer has an inwardly concave arc-shaped structure. A pressure ring may or may not be fitted on the lower pressure block. When the pressure ring is fitted on the lower pressure block, the mold ring, lower pressure block, and pressure ring are respectively located above the substrate. The outer diameter of the mold ring is the same as the outer diameter of the substrate. The inner sidewall of the mold ring is in close contact with the outer sidewall of the pressure ring, and the inner sidewall of the pressure ring is in close contact with the outer sidewall of the lower pressure block. When the pressure ring is not fitted on the lower pressure block, the lower pressure block is located above the substrate. The outer diameter of the lower pressure block is the same as the outer diameter of the substrate. The outer sidewall of the lower pressure block and the outer sidewall of the substrate are respectively in close contact with the inner sidewall of the mold ring.
[0017] In this invention, the grinding wheel is prepared in stages by setting up a forming mold and a sintering mold. During pressing, there is no substrate, resulting in a hollow hemispherical abrasive layer blank, which ensures the dimensional accuracy and uniformity of the abrasive layer. After pressing, the hollow hemispherical abrasive layer blank is assembled with the sintering mold. The pressing block and pressure ring used in the sintering mold can be directly reused from the forming mold, reducing mold manufacturing costs. As is common knowledge, the side of the substrate in contact with the abrasive layer has a concave arc structure, closely fitting the convex surface of the abrasive layer blank. In practical applications, the side of the substrate in contact with the abrasive layer can be sandblasted to ensure a strong bond between the substrate and the abrasive layer.
[0018] Due to the application of the above technical solutions, the concave hemispherical metal superhard grinding wheel forming mold and sintering mold of this utility model have the following advantages: First, compared with the prior art, this utility model can press and form a concave hemispherical abrasive layer blank in one go, and then use the sintering mold to perform conventional sintering on the prepared blank to obtain a concave hemispherical metal superhard grinding wheel, which solves the problem of large allowance grinding and waste of raw materials in the prior art and improves production efficiency; Second, by setting up a forming mold and a sintering mold, pressing first and then sintering, there is no matrix during pressing, which ensures the density and uniformity of the grinding wheel abrasive layer structure; Third, by setting up washers and pads to raise the mold frame, it further ensures that the abrasive layer blank has a uniform distribution and tight bonding during the pressing process. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the concave hemispherical metal superhard grinding wheel forming mold in the feeding state of Example 1.
[0020] Figure 2 This is a schematic diagram of the structure of the concave hemispherical metal superhard grinding wheel forming mold under pressing state in Example 1.
[0021] Figure 3 This is a schematic diagram of the structure of the concave hemispherical metal superhard grinding wheel sintering mold in Example 1.
[0022] Figure 4 This is a schematic diagram of the concave hemispherical metal superhard grinding wheel forming mold in the feeding state of Example 3.
[0023] Figure 5 This is a schematic diagram of the structure of the concave hemispherical metal superhard grinding wheel forming mold under pressing state in Example 3.
[0024] Figure 6 This is a schematic diagram of the structure of the concave hemispherical metal superhard grinding wheel sintering mold in Example 3.
[0025] The components include: mold frame 1, upper pressure block 2, lower pressure block 3, pressure ring 4, washer 5, pad 6, mold ring 7, substrate 9, abrasive layer blank 10, support 201, mandrel 202, first pressure head 301, and second pressure head 302. Detailed Implementation
[0026] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments. The specific components involved are prior art, and the connection and usage methods between the specific components are conventional techniques.
[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are merely for ease of description and should not be construed as limiting the invention.
[0028] The raw materials for preparing concave hemispherical metal superhard grinding wheels are existing products that meet the conventional requirements for grinding wheels. The inventiveness of this invention lies in the novel forming mold and sintering mold, which can integrally press and form a concave hemispherical abrasive layer blank in one step. Then, the blank is conventionally sintered using the sintering mold to obtain the concave hemispherical metal superhard grinding wheel. This solves the problems of existing technologies requiring large allowances for regrinding and wasting raw materials. Furthermore, the absence of a matrix during pressing ensures the density and uniformity of the abrasive layer structure, resulting in more stable workpiece quality. Example 1
[0029] like Figures 1 to 3 As shown:
[0030] A concave hemispherical metal superhard grinding wheel forming mold and sintering mold are used to prepare concave hemispherical metal superhard grinding wheels. The specifications of the grinding wheel after forming are DW, 67.2×60×30×3 (mm) M22.
[0031] The concave hemispherical metal superhard grinding wheel forming mold includes a mold frame 1, an upper pressure block 2, a lower pressure block 3, a pressure ring 4, a washer 5, and a pad 6;
[0032] The outer diameter of the mold frame is 120mm and the height is 50mm. The upper part of the inner wall of the mold frame has a stepped structure with a height of 10mm and a width of 5mm. The lower inner diameter is 63.2mm.
[0033] The upper pressure block, lower pressure block, and pressure ring are all located inside the mold frame; the upper pressure block is located above the lower pressure block; the side of the upper pressure block that contacts the abrasive layer has an inwardly concave arc-shaped structure; the side of the lower pressure block that contacts the abrasive layer has an outwardly convex arc-shaped structure; the pressure ring is sleeved on the lower pressure block, and its inner sidewall is in close contact with the outer sidewall of the lower pressure block.
[0034] The upper pressure block includes a support 201 and a core rod 202; the upper part of the support extends outward to form a lug, the size of which is consistent with the size of the stepped structure of the mold frame, with a height of 10mm and a width of 5mm; the lug is located on the stepped structure;
[0035] In this embodiment, the support and mandrel, as well as the lower pressing block and the pressing ring, are all separate structures. The mold frame, support, mandrel, lower pressing block, and pressing ring together form a mold cavity with a thickness of 2.8 mm, in which the powder raw material is placed. After conventional pressing, a hollow hemispherical abrasive layer blank is obtained.
[0036] The outer side wall of the support and the outer side wall of the pressure ring are in contact with the inner side wall of the mold frame; the lower end face of the mold frame, the lower end face of the pressure ring, and the lower end face of the lower pressure block are flush.
[0037] The mandrel is located inside the support; the outer wall of the mandrel is in close contact with the inner wall of the support; the upper end face of the mold frame, the upper end face of the support, and the upper end face of the mandrel are flush.
[0038] The pressing block includes a first pressing head 301 and a second pressing head 302; the first pressing head is located on the second pressing head; the first pressing head has a spherical crown structure; the second pressing head has a columnar structure. A pressure ring is sleeved on the first pressing head, with an outer diameter of 63.2 mm, an inner diameter of 57.24 mm, and a height of 9.5 mm, which is 0.5 mm smaller than the height of the first pressing head. In this embodiment, the first pressing head and the second pressing head are an integral structure.
[0039] The washer is located outside the pressure ring and is 2mm lower in height than the pressure ring. The mold frame is located on the washer to elevate the mold frame. The pad is located below the washer.
[0040] The concave hemispherical metal superhard grinding wheel sintering mold includes a mold ring 7, a lower pressure block, a base 9, and a pressure ring, wherein the lower pressure block and the pressure ring are the same as the lower pressure block and pressure ring of the forming mold;
[0041] The die ring, lower pressure block, and pressure ring are located above the substrate. The outer diameter of the die ring is 68mm, the inner diameter is 63.2mm, and the height is 9.5mm. The outer diameter of the substrate is 68mm, and the side in contact with the abrasive layer is a concave arc structure with a radius of 32.8mm. The die ring is fitted onto the pressure ring, and its inner sidewall is in close contact with the outer sidewall of the pressure ring.
[0042] The method of using the concave hemispherical metal superhard grinding wheel forming mold and sintering mold in this embodiment is as follows:
[0043] (1) According to Figure 1 The assembly mold shown is used, with only the mandrel left unassembled. The theoretical material quantity is then weighed and fed into the mold cavity through the center hole of the support. Finally, the mandrel is assembled to complete the material loading process.
[0044] (2) Invert the mold as a whole, remove the gasket, and use a conventional hot press sintering machine to perform conventional pressing (the pressing temperature is lower than the sintering temperature for preparing the grinding wheel) to obtain the abrasive layer blank 10. The thickness of the abrasive layer blank is 2.8 mm, the radius of the inner arc is 30 mm, and there is a straight edge with a thickness of 0.5 mm on the arc.
[0045] (3) Disassemble the molding mold, according to Figure 3 The assembly sintering mold shown is used for conventional sintering with a conventional hot press sintering machine, so that the abrasive layer is bonded to the matrix, and a concave hemispherical metal superhard grinding wheel blank is obtained.
[0046] (4) Disassemble the sintering mold and perform conventional fine grinding and fine turning on the concave hemispherical metal superhard grinding wheel blank to obtain the finished concave hemispherical metal superhard grinding wheel. Example 2
[0047] Based on Embodiment 1, the difference in this embodiment is that the lower pressure block and the pressure ring are adjusted to be an integral structure, while the rest remains the same. The integral structure of the lower pressure block and the pressure ring reduces the number of mold components required for assembly, making operation more convenient. Example 3
[0048] like Figures 4 to 6 As shown:
[0049] A concave hemispherical metal superhard grinding wheel forming mold and sintering mold are used to prepare concave hemispherical metal superhard grinding wheels. The specifications of the grinding wheel after forming are DW, 114.3×43.86×18.796×6.86 (mm) R / 85.81.
[0050] The concave hemispherical metal superhard grinding wheel forming mold includes a mold frame 1, an upper pressure block 2, a lower pressure block 3, a washer 5, and a pad 6;
[0051] The outer diameter of the mold frame is 190mm and the height is 60mm. The upper part of the inner wall of the mold frame has a stepped structure with a height of 10mm and a width of 5mm. The lower inner diameter is 116mm.
[0052] Both the upper and lower pressure blocks are located inside the mold frame; the upper pressure block is located above the lower pressure block; the side of the upper pressure block that contacts the abrasive layer has an inwardly concave arc shape, and the radius of the arc on the side that contacts the abrasive layer is 85.8mm; the side of the lower pressure block that contacts the abrasive layer has an outwardly convex arc shape, and the radius of the arc on the side that contacts the abrasive layer is 85.8mm.
[0053] The upper pressure block includes a support 201 and a core rod 202; the upper part of the support extends outward to form a lug, the size of which is consistent with the size of the stepped structure of the mold frame, with a height of 10mm and a width of 5mm; the lug is located on the stepped structure;
[0054] In this embodiment, the support and the mandrel are separate structures. The mold frame, support, mandrel and lower pressure block form a mold cavity with a thickness of 6.86mm, where the powder raw material is placed. After conventional pressing, a hollow hemispherical abrasive layer blank is obtained.
[0055] The outer side wall of the support and the outer side wall of the pressure ring are in contact with the inner side wall of the mold frame; the lower end face of the mold frame and the lower end face of the lower pressure block are flush with each other.
[0056] The mandrel is located inside the support; the outer wall of the mandrel is in close contact with the inner wall of the support; the upper end face of the mold frame, the upper end face of the support, and the upper end face of the mandrel are flush.
[0057] The lower pressure block has a height of 32.57 mm and includes a first pressure head 301 and a second pressure head 302. The first pressure head is located on the second pressure head. The first pressure head has a spherical cap structure with a height of 10 mm. The second pressure head has a columnar structure. In this embodiment, the first pressure head and the second pressure head are an integral structure.
[0058] The pressing block includes a first pressing head 301 and a second pressing head 302; the first pressing head is located on the second pressing head; the first pressing head has a spherical crown structure; the second pressing head has a columnar structure. A pressure ring is sleeved on the first pressing head, with an outer diameter of 63.2 mm, an inner diameter of 57.24 mm, and a height of 9.5 mm, which is 0.5 mm smaller than the height of the first pressing head. In this embodiment, the first pressing head and the second pressing head are an integral structure.
[0059] The washer is located on the outside of the second pressure head and is 2.5mm smaller than the height of the second pressure head. The mold frame is located on the washer to raise the mold frame. The pad is located below the washer.
[0060] The concave hemispherical metal superhard grinding wheel sintering mold includes a mold ring 7, a lower pressure block, and a base 9, wherein the lower pressure block is the lower pressure block of the forming mold;
[0061] The pressure block is located above the substrate; the outer diameter of the die ring is 180mm, the inner diameter is 116mm, and the height is 54mm; the outer diameter of the substrate is 116mm, and the side in contact with the abrasive layer is a concave arc structure with a radius of 85.8mm; the outer wall of the pressure block and the outer wall of the substrate are in contact with the inner wall of the die ring.
[0062] The method of using the concave hemispherical metal superhard grinding wheel forming mold and sintering mold in this embodiment is as follows:
[0063] (1) According to Figure 4 The assembly mold shown is used, with only the mandrel left unassembled. The theoretical material quantity is then weighed and fed into the mold cavity through the center hole of the support. Finally, the mandrel is assembled to complete the material loading process.
[0064] (2) Invert the mold as a whole, remove the gasket, and use a conventional hot press sintering machine to perform conventional pressing (the pressing temperature is lower than the sintering temperature for preparing the grinding wheel) to obtain the abrasive layer blank 10. The thickness of the abrasive layer blank is 6.86 mm, and the radii of the inner and outer arcs are both 85.8 mm.
[0065] (3) Disassemble the molding mold, according to Figure 6The assembly sintering mold shown is used for conventional sintering with a conventional hot press sintering machine, so that the abrasive layer is bonded to the matrix, and a concave hemispherical metal superhard grinding wheel blank is obtained.
[0066] (4) Disassemble the sintering mold and perform conventional fine grinding and fine turning on the concave hemispherical metal superhard grinding wheel blank to obtain the finished concave hemispherical metal superhard grinding wheel.
[0067] Application Example 1
[0068] The concave hemispherical metal superhard grinding wheel is prepared using the forming mold and sintering mold of Example 1. Compared with the existing method of preparing concave hemispherical metal superhard grinding wheels of the same specification (first sintering the abrasive layer and the substrate together to form a planar structure, and then using an electrical discharge dressing equipment to grind the concave hemispherical structure with a large allowance), the overall cost (materials, labor, time) is reduced by 30%. Moreover, when using the concave hemispherical metal superhard grinding wheel to grind spherical metal workpieces according to conventional methods, the surface quality of the workpiece after grinding is comparable to that of the workpiece after grinding with grinding wheels prepared by existing production.
[0069] Application Example 2
[0070] The concave hemispherical metal superhard grinding wheel was prepared using the forming mold and sintering mold of Example 3. Compared with the existing method of preparing concave hemispherical metal superhard grinding wheels of the same specifications (first sintering the abrasive layer and the substrate together to form a planar structure, and then using an electrical discharge dressing equipment to grind the concave hemispherical structure with a large allowance), the overall cost (materials, labor, time) is reduced by 25%. Moreover, when using the concave hemispherical metal superhard grinding wheel to grind spherical optical glass according to conventional methods, the surface quality of the workpiece after grinding is comparable to that of the workpiece after grinding with grinding wheels prepared by existing production.
[0071] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the principle of the present utility model, and these should also be considered to fall within the protection scope of the present utility model.
Claims
1. A concave hemispherical metal superhard grinding wheel forming mold, characterized in that: The device includes a mold frame and an upper pressure block and a lower pressure block located within the mold frame. The upper pressure block is located above the lower pressure block. The side of the upper pressure block that contacts the abrasive layer has an inwardly concave arc-shaped structure. The side of the lower pressure block that contacts the abrasive layer has an outwardly convex arc-shaped structure. The upper pressure block includes a support and a core rod. The inner sidewall of the mold frame has a stepped structure. The upper part of the support extends outward to form a lug. The lug is located on the stepped structure. The height of the stepped structure is the same as the height of the lug. The lower pressure block may or may not have a pressure ring fitted on it.
2. The concave hemispherical metal superhard grinding wheel forming mold according to claim 1, characterized in that: The lower pressure block and the pressure ring can be separate or integrated.
3. The concave hemispherical metal superhard grinding wheel forming mold according to claim 1, characterized in that: When the pressure ring is fitted onto the lower pressure block, the outer wall of the support and the outer wall of the pressure ring are in contact with the inner wall of the mold frame, and the lower end face of the mold frame, the lower end face of the pressure ring, and the lower end face of the lower pressure block are flush.
4. The concave hemispherical metal superhard grinding wheel forming mold according to claim 1, characterized in that: When the pressure ring is not fitted on the lower pressure block, the outer wall of the support and the outer wall of the lower pressure block are in contact with the inner wall of the mold frame, and the lower end face of the mold frame is flush with the lower end face of the lower pressure block.
5. The concave hemispherical metal superhard grinding wheel forming mold according to claim 1, characterized in that: The mandrel is located inside the support; the outer wall of the mandrel is in contact with the inner wall of the support; the upper end face of the mold frame, the upper end face of the support, and the upper end face of the mandrel are flush.
6. The concave hemispherical metal superhard grinding wheel forming mold according to claim 1, characterized in that: The pressing block includes a first pressing head and a second pressing head; the first pressing head is located on the second pressing head; the first pressing head has a spherical crown structure; the second pressing head has a columnar structure.
7. The concave hemispherical metal superhard grinding wheel forming mold according to claim 6, characterized in that: The first pressure head and the second pressure head are an integral structure.
8. The concave hemispherical metal superhard grinding wheel forming mold according to claim 6, characterized in that: When the pressure ring is fitted onto the pressure block, a washer is provided on the outside of the pressure ring, a pad is provided below the washer, the mold frame is located on the washer, the second pressure head is 0.2~1mm higher than the pressure ring, and the height of the washer is less than the height of the pressure ring.
9. The concave hemispherical metal superhard grinding wheel forming mold according to claim 6, characterized in that: When the pressure ring is not fitted on the pressing block, a washer is provided on the outside of the second pressing head, a pad is provided below the washer, the mold frame is located on the washer, and the height of the washer is less than the height of the second pressing head.
10. A concave hemispherical metal superhard grinding wheel sintering mold, characterized in that: The device includes a die ring, a lower pressure block, and a substrate. The side of the lower pressure block that contacts the abrasive layer has a convex arc shape, while the side of the substrate that contacts the abrasive layer has a concave arc shape. A pressure ring may or may not be fitted onto the lower pressure block. When a pressure ring is fitted onto the lower pressure block, the die ring, lower pressure block, and pressure ring are located above the substrate. The outer diameter of the die ring is the same as the outer diameter of the substrate, and the inner wall of the die ring is in close contact with the outer wall of the pressure ring. The inner wall of the pressure ring is in close contact with the outer wall of the lower pressure block. When a pressure ring is not fitted onto the lower pressure block, the lower pressure block is located above the substrate, and the outer diameter of the lower pressure block is the same as the outer diameter of the substrate. The outer wall of the lower pressure block and the outer wall of the substrate are in close contact with the inner wall of the die ring.