Clamp for test of grinding silicon carbide ceramic by porous diamond abrasive particles

Abstract

The utility model belongs to the field of precision machining, and particularly relates to a clamp for a test of grinding silicon carbide ceramics by porous diamond abrasive particles. The clamp is composed of a clamping part and an angle fine adjustment part, the clamping part comprises a clamping block, a positioning block and a compression bolt and is used for clamping a workpiece, and the angle fine adjustment part comprises a bench clamp seat, a limiting block, a chassis, a base, a locking handle, a horizontal angle needle, a vertical angle needle, a blocking cover and a limiting rod. The included angle of the silicon carbide ceramic workpiece relative to the grinding direction of the porous diamond abrasive particles can be changed, and then the cutting depth of the abrasive particles is changed. According to the device, the cutting depth of the abrasive particles can be accurately controlled, and effective help can be provided for self-sharpening research of the porous diamond abrasive particles.

Description

Technical Field

[0001] This utility model belongs to the field of precision machining, specifically relating to a fixture for testing silicon carbide ceramics using porous diamond abrasive. Background Technology

[0002] In recent years, hard and brittle materials, represented by silicon carbide (SiC) ceramics, have been widely used in high-end equipment fields such as satellite optical mirrors due to their excellent material properties. However, as a typical difficult-to-machine material, its excellent properties place high demands on processing. Porous diamond superhard abrasives are a new type of diamond superhard abrasive developed in recent years. These abrasives have multiple micropore structures on their surface, forming numerous micro-cutting edges. Compared with other abrasives, they have the characteristics of high efficiency and low damage when grinding hard and brittle materials, making them the preferred processing method for silicon carbide ceramics. However, the factors affecting the grinding and removal of silicon carbide ceramics are numerous and complex. The research on its self-sharpening mechanism is still in a bottleneck period. In actual experiments, the depth of cut of porous diamond abrasives needs to be strictly controlled and adjusted. At the same time, the fixture used in the experiment needs to be used with a high-precision electric displacement stage. The overall size is small, but the fixtures currently available on the market cannot meet the size requirements and are also difficult to match with high-precision electric displacement stages. Therefore, it is not possible to use existing ordinary fixtures to assist in the experiment of grinding silicon carbide ceramics with porous diamond abrasives.

[0003] To address the aforementioned problems, this invention proposes a fixture for testing porous diamond abrasive grinding silicon carbide ceramics. This fixture can precisely control the abrasive cutting depth and also provide effective assistance for the study of the self-sharpening properties of porous diamond abrasives. Summary of the Invention

[0004] The purpose of this invention is to provide a fixture for testing porous diamond abrasive grinding of silicon carbide ceramics in order to solve the above-mentioned problems.

[0005] A fixture for testing porous diamond abrasive grinding of silicon carbide ceramics is characterized in that the fixture includes a workpiece to be tested, a clamping block, a positioning block, a clamping bolt, a vise seat, a limiting block, a chassis, a base, a locking handle, a horizontal angle pin, a vertical angle pin, a stop cover, a limiting bar, M6 bolts, and M8 bolts; wherein the clamping components include: a clamping block, a positioning block, and a clamping bolt; the angle micro-adjustment components include: a vise seat, a limiting block, a chassis, a base, a locking handle, a horizontal angle pin, a vertical angle pin, a stop cover, and a limiting bar; and the fixing connection components include: M6 bolts and M8 bolts.

[0006] The inner platform of the clamping block, the inner end face of the positioning block, and the bottom surface are all precision ground and polished to ensure a surface roughness of 0.1μm or less. After processing, they are drilled, enlarged, and reamed. The size L of the positioning block and the size S of the inner platform of the clamping block must be consistent, and the distance H between the inner platforms of the clamping blocks must be greater than 80mm but not more than 100mm to avoid imbalance due to excessive size of the clamping block.

[0007] The curved end faces of the vise base, limiting block, and chassis are all precision ground and polished to ensure a surface roughness of 0.1μm or less. After machining, they are drilled, enlarged, and reamed, with the hole size consistent with the size of the hole in the clamping block. The upper end face of the base and the lower end face of the chassis are also precision ground and polished to ensure a surface roughness of 0.1μm or less. Both are equipped with limiting holes for installing limiting bars. Angle values ​​are engraved on the outer surfaces of the chassis and the base, with a graduation of 1° and a range of -5° to 5° (counterclockwise direction is positive).

[0008] The fixture for testing the grinding of silicon carbide ceramics with porous diamond abrasives is assembled according to the following steps: First, the base and the cover are fixed with M8 bolts, and a limiting rod is installed in the limiting hole inside the base, and a locking handle is installed on its outside; second, the chassis is installed in the corresponding position of the base according to the position of the limiting hole, and a locking handle and a horizontal angle pin are installed on the outside of the chassis; then, the vertical angle pin is installed on the side surface of the vise seat, and its arc end face is aligned with the arc end face of the chassis, and a limiting block is installed on the corresponding position on the upper end face of the chassis, which restricts the movement of the vise seat relative to the chassis, and the limiting block is fixed with M8 bolts; finally, the clamping block is fixed to the surface of the vise seat with M8 bolts, and the positioning block is fixed to the table surface of the vise seat with M6 bolts, completing the assembly of the entire fixture.

[0009] This invention relates to a fixture for testing the grinding of silicon carbide ceramics with porous diamond abrasive. The fixture can control the depth of cut of the porous diamond abrasive by finely adjusting the horizontal and vertical angles of the workpiece relative to the grinding direction of the porous diamond abrasive. Specifically, this adjustment is achieved by adjusting the horizontal angle adjustment component of the base and the vertical angle adjustment component of the vise seat. The specific adjustment method is as follows: The horizontal angle can be adjusted by slightly rotating the base by hand according to the direction adjustment requirements and the range of the horizontal angle needle. After the angle is appropriate, rotate the locking handle on the base to prevent the base from slipping and loosening, causing the angle to deviate from the normal value. Similarly, the vertical angle can be adjusted by slightly rotating the vise seat by hand according to the direction adjustment requirements and the range of the vertical angle needle. After the angle is appropriate, rotate the locking handle on the surface of the base to prevent the vise seat from deviating from the normal angle value due to the cutting force transmitted during the test.

[0010] The specific steps for using the fixture of this invention for testing porous diamond abrasive grinding of silicon carbide ceramics are as follows:

[0011] I. Fixture Installation and Silicon Carbide Ceramic Workpiece Fixing: First, fix the test pressure plate to the surface of the test bench, then fix the test support block to the corresponding position on the pressure plate, and simultaneously fix the bottom surface of the high-precision electric displacement stage to the test rectangular support block; next, use M8 screws to install and fix the assembled porous diamond abrasive grinding silicon carbide ceramic test fixture to the surface of the high-precision electric displacement stage; then, install any bottom surface of the workpiece to be tested on the surface of the clamping block and make the entire workpiece close to the surface of the positioning block, install the four clamping screws symmetrically to the corresponding holes on the outer surface of the clamping block in sequence, clamp the workpiece to be tested, and complete the fixture installation and silicon carbide ceramic workpiece fixing.

[0012] II. Adjusting the Angle Between the Silicon Carbide Ceramic Workpiece and the Grinding Direction of the Porous Diamond Abrasive: First, control the feed rate and feed volume of the high-precision electric displacement stage used in the test to bring the workpiece close to the tool equipped with porous diamond abrasive. Stop feeding when the distance between the workpiece and the porous diamond abrasive reaches the contact limit. Second, adjust and lock the horizontal angle adjustment component of the chassis according to the test conditions so that the horizontal angle between the workpiece and the grinding direction of the porous diamond abrasive meets the test requirements. Finally, adjust and lock the vertical angle adjustment component of the vise according to the test conditions so that the vertical angle between the workpiece and the grinding direction of the porous diamond abrasive meets the test requirements. This completes the adjustment of the angle between the silicon carbide ceramic workpiece and the grinding direction of the porous diamond abrasive, thereby controlling the depth of cut of the porous diamond abrasive.

[0013] Compared with existing fixtures for grinding silicon carbide ceramics with porous diamond abrasives, the advantages of this utility model are: (i) the fixture can strictly control and adjust the cutting depth of porous diamond abrasives, and can carry out grinding tests of porous diamond abrasives under different cutting depth conditions; (ii) the fixture can be used with a high-precision electric displacement stage, with a small overall size and small error during the test; (iii) it can provide effective assistance for the study of the self-sharpening property of porous diamond abrasives. Attached Figure Description

[0014] Figure 1 This is an overall schematic diagram of the grinding test fixture;

[0015] Figure 2 This is the front view of the grinding test fixture;

[0016] Figure 3 This is a side view of the grinding test fixture;

[0017] Figure 4 This is a bottom view of the grinding test fixture;

[0018] Figure 5 This is an internal perspective view of the grinding test fixture;

[0019] Figure 6 This is a schematic diagram of the clamping block;

[0020] Figure 7 This is a schematic diagram of a bench vise base;

[0021] Figure 8 This is a schematic diagram of the chassis;

[0022] Figure 9 This is a schematic diagram of the base;

[0023] In the diagram: 1. Workpiece to be tested; 2. Clamping block; 3. Positioning block; 4. Clamping bolt; 5. Bench vise seat; 6. Limiting block; 7. Chassis; 8. Base; 9. Locking handle; 10. Horizontal angle pin; 11. Vertical angle pin; 12. Cover; 13. Limiting bar; 14. M6 bolt; 15. M8 bolt. Detailed Implementation

[0024] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0025] Specific Implementation Method 1: The fixture for testing the grinding of silicon carbide ceramics with porous diamond abrasives includes the workpiece to be tested, clamping blocks, positioning blocks, clamping bolts, vise base, limiting blocks, chassis, base, locking handle, horizontal angle pins, vertical angle pins, a stop cover, a limiting bar, M6 bolts, and M8 bolts; wherein the clamping components include: clamping blocks, positioning blocks, and clamping bolts; the angle fine adjustment components include: vise base, limiting blocks, chassis, base, locking handle, horizontal angle pins, vertical angle pins, a stop cover, and a limiting bar; the fixed connection components include: M6 bolts and M8 bolts.

[0026] In this embodiment, the inner platform surface of the clamping block, the inner end face of the positioning block, and the bottom surface are all precision ground and polished to ensure a surface roughness of 0.1μm or less. After machining, drilling, reaming, and boring are performed on them respectively. The size L of the positioning block and the size S of the inner platform surface of the clamping block must be consistent, and the distance H between the inner platforms of the clamping blocks is greater than 80mm but not more than 100mm to avoid imbalance due to excessive clamping block size. The curved end faces of the vise seat, the limiting block, and the chassis are all precision ground and polished. The surface is machined to ensure a roughness of 0.1μm or less. After machining, it is also drilled, enlarged, and reamed, with the hole size consistent with the hole size in the clamping block. The upper end face of the base and the lower end face of the chassis are also precision ground and polished to ensure a surface roughness of 0.1μm or less. At the same time, both are equipped with limiting holes for installing limiting rods. Angle values ​​are engraved on the outer surface of the chassis and the outer surface of the base, with a graduation value of 1° and a range of -5° to 5° (counterclockwise direction is positive).

[0027] Specific Implementation Method Two: The fixture for the test of grinding silicon carbide ceramics with porous diamond abrasives is assembled according to the following steps: First, fix the base and the cover with M8 bolts, and install a limit bar in the limit hole inside the base, and install the locking handle on the outside; second, install the chassis in the corresponding position of the base according to the position of the limit hole, and install the locking handle and the horizontal angle pin on the outside of the chassis; then, install the vertical angle pin on the side surface of the vise seat, and at the same time, align its arc end face with the arc end face of the chassis, and install the limit block in the corresponding position on the upper end face of the chassis, so that the movement of the vise seat relative to the chassis is restricted by the limit block, and fix the limit block with M8 bolts; finally, fix the clamping block to the surface of the vise seat with M8 bolts, and fix the positioning block to the table surface of the vise seat with M6 bolts, thus completing the assembly of the entire fixture.

[0028] Specific Implementation Method 3: The fixture used for testing the grinding of silicon carbide ceramics with porous diamond abrasives can control the depth of cut of the porous diamond abrasives by finely adjusting the horizontal and vertical angles of the workpiece relative to the grinding direction of the porous diamond abrasives. This adjustment is achieved by adjusting the horizontal angle adjustment component of the base and the vertical angle adjustment component of the vise seat. The specific adjustment method is as follows: Adjust the horizontal angle by slightly rotating the base by hand according to the direction adjustment requirements and the range of the horizontal angle needle. After the angle is appropriate, rotate the locking handle on the base to prevent the base from slipping and loosening, causing the angle to deviate from the normal value. Similarly, adjust the vertical angle by slightly rotating the vise seat by hand according to the direction adjustment requirements and the range of the vertical angle needle. After the angle is appropriate, rotate the locking handle on the surface of the base to prevent the vise seat from deviating from the normal angle value due to the cutting force transmitted during the test.

[0029] Specific Implementation Method Four: The fixture for testing porous diamond abrasive grinding of silicon carbide ceramics according to this utility model shall be used according to the following steps:

[0030] I. Fixture Installation and Silicon Carbide Ceramic Workpiece Fixing: First, fix the test pressure plate to the surface of the test bench, then fix the test support block to the corresponding position on the pressure plate, and simultaneously fix the bottom surface of the high-precision electric displacement stage to the test rectangular support block; next, use M8 screws to install and fix the assembled porous diamond abrasive grinding silicon carbide ceramic test fixture to the surface of the high-precision electric displacement stage; then, install any bottom surface of the workpiece to be tested on the surface of the clamping block and make the entire workpiece close to the surface of the positioning block, install the four clamping screws symmetrically to the corresponding holes on the outer surface of the clamping block in sequence, clamp the workpiece to be tested, and complete the fixture installation and silicon carbide ceramic workpiece fixing.

[0031] II. Adjusting the Angle Between the Silicon Carbide Ceramic Workpiece and the Grinding Direction of the Porous Diamond Abrasive: First, control the feed rate and feed volume of the high-precision electric displacement stage used in the test to bring the workpiece close to the tool equipped with porous diamond abrasive. Stop feeding when the distance between the workpiece and the porous diamond abrasive reaches the contact limit. Second, adjust and lock the horizontal angle adjustment component of the chassis according to the test conditions so that the horizontal angle between the workpiece and the grinding direction of the porous diamond abrasive meets the test requirements. Finally, adjust and lock the vertical angle adjustment component of the vise according to the test conditions so that the vertical angle between the workpiece and the grinding direction of the porous diamond abrasive meets the test requirements. This completes the adjustment of the angle between the silicon carbide ceramic workpiece and the grinding direction of the porous diamond abrasive, thereby controlling the depth of cut of the porous diamond abrasive.

Claims

1. A fixture for testing porous diamond abrasive grinding of silicon carbide ceramics, characterized in that, The fixture used for the porous diamond abrasive grinding of silicon carbide ceramics specifically includes: The test workpiece (1), clamping components, angle fine adjustment components, and fixed connection components; The clamping components include: a clamping block (2), a positioning block (3), and a clamping bolt (4); The angle fine adjustment component includes: bench vise (5), limit block (6), chassis (7), base (8), locking handle (9), horizontal angle needle (10), vertical angle needle (11), cover (12), and limit bar (13); The fixed connection components include: bolts M6 (14) and bolts M8 (15); The inner platform of the clamping block (2), the inner end face and the bottom surface of the positioning block (3) are all precision ground and polished to ensure that the surface roughness is 0.1μm or less. After processing, they are drilled, enlarged and reamed respectively. The size L of the positioning block (3) and the size S of the inner platform of the clamping block (2) must be consistent, and the distance H between the inner platforms of the clamping block (2) is greater than 80mm but not more than 100mm to avoid imbalance due to the excessive size of the clamping block. The arc end faces of the vise base (5), the limiting block (6), and the chassis (7) are all precision ground and polished to ensure a surface roughness of 0.1μm or less. After processing, they are drilled, enlarged, and reamed, with the size of the holes being consistent with the size of the holes in the clamping block (2). The upper end face of the base (8) and the lower end face of the chassis (7) are also precision ground and polished to ensure a surface roughness of 0.1μm or less. At the same time, limiting holes are provided inside both for installing limiting rods. Angle values ​​are engraved on the outer surface of the chassis (7) and the outer surface of the base (8), with a graduation value of 1° and a range of -5° to 5°. The fixture used for grinding silicon carbide ceramics with porous diamond abrasive can control the depth of cut of porous diamond abrasive by finely adjusting the horizontal and vertical angles of the workpiece (1) to be tested relative to the grinding direction of porous diamond abrasive. The specific adjustment function is achieved by adjusting the horizontal angle adjustment component of the base (7) and the vertical angle adjustment component of the vise seat (5). The horizontal angle can be adjusted by slightly rotating the base (7) by hand according to the direction adjustment requirements and the range of the horizontal angle needle (10). After the angle is appropriate, rotate the locking handle (9) on the base (8) to prevent the base (7) from slipping and loosening, causing the angle to deviate from the normal value. Similarly, the vertical angle can be adjusted by slightly rotating the vise seat (5) by hand according to the direction adjustment requirements and the adjustment range of the vertical angle needle (11). After the angle is appropriate, rotate the locking handle (9) on the surface of the base (7) to prevent the vise seat (5) from deviating from the normal angle value due to the cutting force transmission during the test.

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