A ring fixture for reducing the gap between tile-shaped permanent magnets

Abstract

The present invention discloses an annular clamp for reducing the splicing gap of a tile-shaped permanent magnet, belonging to the technical field of permanent magnet processing and assembly, comprising a clamp base (1), a clamp body (2) and at least two positioning blocks (3), wherein the clamp body (2) is concentric with the clamp base (1) and fixedly connected to the top of the clamp base (1), and the positioning blocks (3) are evenly arranged near the circumference of the clamp base (1); a processing machine tool clamping through hole (18) is arranged at the center of the bottom of the clamp base (1), a clamping cavity for clamping a magnetic tile to be processed is arranged at the center of the clamp body (2), and a plurality of radial slits (23) with uniform depth and uniform distribution are arranged on the circumference, and a broken seam (24) is also arranged on the clamp body (2); by adopting the clamp of the present invention, the splicing gap of the entire magnetic ring can be reduced by changing the circumference of the clamp, so as to meet the requirement that the cumulative splicing gap is not greater than 0.08 mm.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet processing and assembly, in particular to an annular clamp for reducing a splicing gap of a tile-shaped permanent magnet. Background Art

[0002] The annular samarium cobalt permanent magnet used in a certain space device is made of more than 20 tiles spliced ​​into a ring. The process requires that the cumulative splicing gap is no more than 0.08mm, which requires that the average arc length deviation of a single tile is less than 0.004mm. However, the existing processing technology for this type of annular samarium cobalt permanent magnet is to directly wire cut it into the final size of the tile. The arc length of the tile processed by this existing process is difficult to meet the above requirements. Summary of the invention

[0003] The purpose of the present invention is to provide an annular clamp for reducing the splicing gap of tile-shaped permanent magnets to solve the above-mentioned problem.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: an annular clamp for reducing the splicing gap of a tile-shaped permanent magnet, comprising a clamp base, a clamp body and at least two positioning blocks, wherein the clamp body is concentric with the clamp base and fixedly connected to the top of the clamp base, and the positioning blocks are evenly arranged near the circumference of the clamp base; a processing machine tool clamping through hole is arranged at the center position of the bottom of the clamp base, a clamping cavity for clamping the magnetic tile to be processed is arranged at the center of the clamp body, and several radial slits with consistent depth and uniform distribution are arranged on the circumference, and a broken seam is also arranged on the clamp body.

[0005] As a preferred technical solution: the clamp body is connected to the clamp base by bolts.

[0006] As a preferred technical solution: the positioning block is connected to the fixture base via bolts.

[0007] As a preferred technical solution: the axial thickness of the clamp body is 4-8 mm longer than the axial length of the magnetic tile to be processed.

[0008] As a preferred technical solution: the slit width is 2.5-3.5 mm.

[0009] Compared with the prior art, the advantages of the present invention are: the fixture of the present invention loads the rough magnetic tile into the inner surface of the annular clamping surface, and by changing the circumference of the fixture, the magnetic tiles are made close to each other along the circumference, and then the inner arc surface of the magnetic tile is processed to a more precise size that meets the final requirements of the magnetic tile by using the internal cylindrical grinding process, and then the magnetic tile is loaded into the external cylindrical fixture positioning surface whose diameter matches the inner diameter of the magnetic tile, and the external cylindrical grinding process is used to grind the outer circle of the magnetic tile to the size that meets the final requirements of the magnetic tile, thereby reducing the splicing gap of the entire magnetic ring and achieving the requirement that the cumulative splicing gap is not greater than 0.08mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic diagram of the assembly structure of a clamp according to an embodiment of the present invention;

[0011] Figure 2 for Figure 1 AA section view;

[0012] Figure 3 for Figure 1 Schematic diagram of the specific structure of the middle clip;

[0013] Figure 4 for Figure 1 Schematic diagram of the structure of the middle fixture base;

[0014] Figure 5 for Figure 4 BB cross-sectional view;

[0015] Figure 6 for Figure 1 Schematic diagram of the structure of the positioning block.

[0016] In the figure: 1. Clamp base; 11. Threaded hole a; 12. Threaded hole b; 13. Threaded hole c; 14. Threaded hole d; 15. Machine tool clamping surface; 16. Clamp body positioning surface; 17. Round surface; 18. Processing machine tool clamping through hole; 2. Clamp body; 21. Threaded hole e; 22. Through hole a; 23. Slit; 24. Break; 25. Magnetic tile clamping surface; 26. Through hole b; 27. Through hole c; 3. Positioning block; 31. Step hole; 32. Threaded hole f; 4. Magnetic tile to be processed; 5. Bolt. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Example:

[0019] See also Figure 1 , a ring-shaped fixture for reducing the gap of tile-shaped permanent magnet splicing, comprising a fixture base 1, a fixture body 2 and at least two positioning blocks 3, wherein the fixture body 2 is concentric with the fixture base 1 and fixedly connected to the top of the fixture base 1, and the positioning blocks 3 are evenly arranged near the circumference of the fixture base 1; a processing machine tool clamping through hole 18 is arranged at the center of the bottom of the fixture base 1, a clamping cavity for clamping the magnetic tile 4 to be processed is arranged at the center of the fixture body 2, and several radial slits 23 with consistent depth and uniform distribution are arranged on the circumference, and a broken seam 24 is also arranged on the fixture body 2;

[0020] The materials used for the fixture base 1, the fixture body 2 and at least two positioning blocks 3 of the present invention are all 45# steel, and other alloy steels can also be used; Figure 1The bolts 5 are cylindrical head hexagon socket bolts or screws of different specifications;

[0021] In this embodiment, the structure of the fixture base 1 is as follows: Figure 4 and Figure 5 As shown, the whole is circular, and threaded holes a11 and b12 for connecting the positioning block 3 are arranged on its circumference, and threaded holes c13 and d14 for connecting the clamp body 2 are also arranged, and the side wall of the processing machine tool clamping through hole 18 is the machine tool clamping surface 15, and the upper end thereof is the clamp body positioning surface 16, and the circular surface 17, and the diameter of the circular surface 17 is slightly larger than the diameter of the inner arc of the magnetic tile 4 to be processed, and is not larger than 1 / 2 of the sum of the inner arc diameter and the outer arc diameter of the magnetic tile 4 to be processed;

[0022] The structure of the clamp body 2 is as follows Figure 3 As shown, the whole is also circular, and is provided with a slit 24, whose width is about 3mm, a threaded hole e21 is provided at one end edge of the slit 24, and a through hole a22 is provided at the other end edge, and ten radial slits 23 with the same depth and uniform distribution are provided on its circumference, and the inner side is a magnetic tile clamping surface 25 for clamping the magnetic tile 4 to be processed, and its diameter size is determined according to the outer diameter size of the magnetic tile 4 to be processed, and a through hole b26 and a through hole c27 for connecting with the threaded hole c13 and the threaded hole d14 of the fixture base 1 are also provided on its circumference;

[0023] In this embodiment, there are three positioning blocks 3 evenly distributed around the clamp base 1. The positioning blocks 3 are symmetrically provided with two step holes 31 for connecting with the clamp base 1 and a threaded hole f32 in the radial direction for positioning the inner arc clamp body 2.

[0024] The axial thickness of the clamp body 2 is 4-8 mm longer than the axial length of the magnetic tile to be processed.

[0025] The width of the fracture 24 is 2.5-3.5 mm.

[0026] The manufacturing process of the above-mentioned clamp body 2 is as follows:

[0027] Rough machining into a complete ring (leaving finishing allowance for inner and outer circumferential surfaces and both end surfaces) and end face through holes b26 and c27 → stress relief heat treatment → finishing of inner and outer circumferences and end surfaces to required dimensions → wire cutting of radial slits 23, disconnected fractures 24 and two triangular notches on the outer circumferential surface → machining of threaded holes e21 and through holes a22.

[0028] Ring clamp installation method:

[0029] Place the clamp body 2 on the clamp positioning surface 16 of the clamp base 1, align the through hole b26 and the through hole c27 of the clamp body 2 with the threaded hole c13 and the threaded hole d14 of the clamp base 1 respectively, and screw in the bolt 5 to connect the clamp body 2 with the clamp base 1;

[0030] Then, three positioning blocks 3 are placed on the fixture positioning surface 16 of the fixture base 1 respectively, so that the step hole 31 of the positioning block 3 is aligned with the threaded hole a11 and the threaded hole b12 of the fixture base 1, and the small hole end surface of the step hole 31 of the positioning block 3 should be in contact with the fixture positioning surface 16 of the fixture base 1, and the bolts 5 are inserted into the step hole 31 of the positioning block 3 and the threaded hole a11 and the threaded hole b12 of the fixture base 1 and tightened to firmly fix the positioning block 3 on the fixture base 1;

[0031] Screw one bolt 5 into each of the threaded holes f32 in the radial direction of the three positioning blocks 3, slightly supporting the clamp body 2; the assembled clamp is as shown in FIG. Figure 1 shown.

[0032] Clamp the assembled fixture as a whole on the three-jaw chuck of the internal machining machine tool through the machine clamping surface 15 provided on the fixture base 1 for the internal machining machine tool, use a dial indicator or a micrometer to align the fixture positioning surface 16 of the fixture base 1, so that the end face runout value of the fixture positioning surface 16 of the fixture base 1 does not exceed the end face runout value required by the magnetic tile, tighten the three-jaw chuck, and firmly fix the annular fixture as a whole on the three-jaw chuck of the internal machining machine tool. At this point, the annular fixture is installed.

[0033] How to hold and remove the magnetic tile:

[0034] Place the magnetic tiles 4 to be processed on the magnetic tile clamping surface 25 of the clamping body 2 in sequence, so that the outer cylindrical surface of each magnetic tile 4 to be processed contacts and fits flatly with the clamping surface 25 of the clamping body 2, and one end surface of the magnetic tile 4 to be processed contacts and fits flatly with the positioning surface 16 of the clamp base 1, and the side surfaces of two adjacent magnetic tiles are close to each other; first install the magnetic tile 4 located within the 1 / 3 position range of the lower side of the clamping surface 25 of the clamping body 2, and then place a piece of soft material (for example, a piece of soft material) with a diameter slightly larger than the inner diameter of the magnetic tile 4 and a thickness close to the axial length of the magnetic tile 4 on the inner cylindrical surface of the installed magnetic tile 4 A gasket (such as a foam board) is used as an auxiliary tool to support the magnetic tile 4 installed later, and to make the outer cylindrical surface of the magnetic tile 4 close to the clamping surface 25 of the clamping body 2; after the clamping surface 25 of the clamping body 2 is filled with a full circle of magnetic tiles 4, bolts 5 are installed in the through holes a22 and the threaded holes e21 of the clamping body 2 and properly tightened, so that the clamping body 2 clamps all the magnetic tiles 4. During the clamping process, it is necessary to check whether there are other broken pieces or debris between adjacent magnetic tiles 4 and between the magnetic tiles 4 and the clamping surface 25 of the clamping body 2, and they should be cleaned up first to prevent affecting the subsequent processing accuracy;

[0035] Use a dial indicator or micrometer probe to contact the part of the clamping surface 25 of the clamp body 2 that is not blocked by the magnetic tile, align the inner cylindrical surface of the clamp body 2, tighten all the bolts 5 at the positions of the through holes b26 and c27 of the clamp body 2, and properly tighten the bolts in the radial threaded holes f32 on the positioning block 3 to support the outer cylindrical surface of the clamp body 2 to prevent the clamp body from shifting; in this step, when the clamp body 2 clamps the magnetic tile, the roundness of the clamping surface 25 may deteriorate due to the deformation of the clamp body 2. At this time, the method of aligning the clamp body is to minimize the deviation value displayed by the dial indicator or micrometer reading; at this time, the adjustment and fixation of the clamp body 2 are completed.

[0036] Taking the clamp body 2 with a clamping surface 25 diameter of φ120mm as an example, practice shows that the roundness error of the clamping surface 25 of the clamp body 2 does not exceed 0.15mm, and the resulting change in magnetic declination does not exceed 0.2°, which is still within an acceptable range compared with the magnetic declination error caused by other factors.

[0037] At this point, the clamping of the first circle of magnetic tiles 4 to be processed is completed, and the grinding of the inner arc surface of the magnetic tiles 4 can be carried out.

[0038] After the inner arc surface of the first circle of the magnetic tile 4 to be processed is processed and the rotation of the inner circle processing machine tool is stopped, the soft material pad used when installing the magnetic tile 4 to be processed is placed on the inner arc surface of the magnetic tile 4 to support the magnetic tile 4 to prevent it from falling; loosen the bolts 5 in the radial threaded holes f32 on the two positioning blocks 3 installed at the threaded hole a11 position of the fixture base 1, as well as the bolts 5 at the position of the through hole c27 of the clamp body 2, and the bolts 5 installed in the threaded holes e21 and the through hole a22 on the clamp body 2, so that the clamp body 2 releases the clamped magnetic tile 4 to be processed. At this time, do not loosen the bolts 5 at other positions for the time being. Take out the processed magnetic tiles 4 to be processed one by one, and place them in groups in order in the container to prevent mixing. Take out the soft material pad, clean the clamping surface 25 of the clamp body 2, and facilitate the clamping of the next batch of magnetic tiles 4 to be processed for inner arc surface processing.

[0039] Since the previous circle of magnetic tiles 4 has been processed, the two bolts 5 installed at the through hole b26 of the clamp body 2 and the one screw 5 in the radial threaded hole f32 on the positioning block 3 installed at the threaded hole b12 of the fixture base 1 have not been loosened, and the clamp body 2 will not produce a large displacement, which is convenient for the subsequent clamping of the magnetic tiles 4 to be processed, and reduces the time consumed by the alignment of the clamp body 2. If the roundness error of the clamping surface 25 of the clamp body 2 continues to increase after the new magnetic tiles 4 to be processed are clamped again, it is necessary to loosen all the bolts 5 that fix the clamp body 2 to the fixture base 1, and all the screws 5 in the radial threaded holes f32 on the positioning blocks 3, and re-align the clamp body 2 that clamps the magnetic tiles 4 to be processed according to the above method, and fix it according to the above method.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A ring fixture for reducing the gap between tile-shaped permanent magnets, characterized in that: The invention comprises a fixture base (1), a fixture body (2) and at least two positioning blocks (3), wherein the fixture body (2) is concentric with the fixture base (1) and fixedly connected to the top of the fixture base (1), and the positioning blocks (3) are evenly arranged near the circumference of the fixture base (1); a processing machine tool clamping through hole (18) is arranged at the center of the bottom of the fixture base (1), a clamping cavity for clamping a magnetic tile to be processed is arranged at the center of the fixture body (2), and a plurality of radial slits (23) with uniform depth and uniform distribution are arranged on the circumference, and a broken seam (24) is also arranged on the fixture body (2).

2. The annular fixture for reducing the splicing gap of tile-shaped permanent magnets according to claim 1 is characterized in that: The clamp body (2) is connected to the clamp base (1) via bolts.

3. The annular fixture for reducing the splicing gap of tile-shaped permanent magnets according to claim 1 is characterized in that: The positioning block (3) is connected to the fixture base (1) via bolts.

4. The annular fixture for reducing the splicing gap of tile-shaped permanent magnets according to claim 1 is characterized in that: The axial thickness of the clamp body (2) is 4-8 mm longer than the axial length of the magnetic tile to be processed.

5. The annular fixture for reducing the splicing gap of tile-shaped permanent magnets according to claim 1 is characterized in that: The width of the fracture (24) is 2.5-3.5 mm.

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