Positioning tool

Abstract

The utility model provides a positioning tool, and relates to the technical field of tool design. The positioning tool is used for positioning a hub, the hub comprises a supporting ring and a plurality of guide rail protruding keys located at one end of the supporting ring, the guide rail protruding keys extend outwards in the axial direction of the supporting ring, the hub further comprises a flange, the flange surrounds the periphery, close to the end of the guide rail protruding keys, of the supporting ring by a circle, and the positioning tool comprises a bottom plate and a pressing device. Wherein the bottom plate is provided with a limiting groove which is recessed inwards from the top face, the bottom face of the limiting groove is provided with a positioning groove and a plurality of receding holes, the end, provided with the guide rail protruding keys, in the supporting ring can be clamped in the limiting groove, one guide rail protruding key in the guide rail protruding keys is arranged in the positioning groove in a penetrating mode, and the remaining guide rail protruding keys are arranged in the different receding holes in a penetrating mode; the pressing device is arranged on the bottom plate, and when the supporting ring is clamped in the limiting groove, the pressing device can press the flange. According to the positioning tool, the alignment rate and the positioning precision can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of tooling design, and more particularly, to a positioning tooling. Background Art

[0002] During the machining process of aircraft wheel brake parts, there are many large parts, such as wheel hubs, which need to strictly ensure the geometric tolerances on both sides of the drawings, and the tolerance requirements are quite high. However, in actual machining, due to the part size and complexity, it is difficult to complete all processes in one machining, and the workpiece needs to be flanged. After flanging, manual alignment is usually required, the alignment speed is slow, and the positioning accuracy is low, making it difficult to ensure that both sides of the part can meet the requirements of the reference geometric tolerances. Therefore, it is necessary to seek an optimized solution to improve the alignment speed and positioning accuracy.

[0003] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] The present disclosure provides a station tooling that can improve the alignment speed and positioning accuracy.

[0005] According to one aspect of the present disclosure, there is provided a positioning tooling for positioning a wheel hub, the wheel hub including a support ring and a plurality of guide rail keys located at one end of the support ring, the guide rail keys extending axially outward along the support ring, the wheel hub further including a flange surrounding the periphery of the end of the support ring close to the guide rail keys, the positioning tooling comprising:

[0006] A bottom plate having a limiting groove recessed inward from the top surface, the bottom surface of the limiting groove being provided with a positioning groove and a plurality of avoidance holes, the end of the support ring having the guide rail keys can be clamped in the limiting groove, one of the guide rail keys of each of the guide rail keys is inserted into the positioning groove, and the remaining guide rail keys are respectively inserted into different avoidance holes;

[0007] A pressing device provided on the bottom plate, which can press the flange when the support ring is clamped in the limiting groove.

[0008] In an exemplary embodiment of the present disclosure, the pressing device includes a plurality of pressing components uniformly distributed circumferentially along the limiting groove, the pressing component including a pressing part and a supporting part connected to each other, one end of the supporting part being in contact with the surface of the bottom plate; the pressing part is connected to the end of the supporting part away from the bottom plate and extends in a direction parallel to the bottom plate, the pressing part is detachably connected to the bottom plate, and the pressing part can press the flange.

[0009] In an exemplary embodiment of the present disclosure, the positioning groove includes a guiding groove and a fixing groove that communicate with each other in a direction parallel to the bottom plate. The guiding groove includes a through first through hole and a second through hole. The first through hole is located on a side of the second through hole close to the bottom surface of the limiting groove. The included angle between the side wall of the first through hole and the central axis of the limiting groove is greater than or equal to 10° and less than or equal to 30°; and in the depth direction of the limiting groove, the size of the opening of the first through hole increases sequentially from bottom to top; the second through hole is a straight hole.

[0010] In an exemplary embodiment of the present disclosure, the positioning groove and the plurality of avoidance holes are annular and evenly distributed at equal intervals.

[0011] In an exemplary embodiment of the present disclosure, both the guiding groove and the fixing groove are rectangular grooves, and the avoidance holes are circular holes.

[0012] In an exemplary embodiment of the present disclosure, the number of the avoidance holes is greater than the number of the guide rail keys.

[0013] In an exemplary embodiment of the present disclosure, the gap between the positioning groove and the guide rail key is less than 0.03 micrometers.

[0014] In an exemplary embodiment of the present disclosure, the pressing portion and the supporting portion are of an integral structure.

[0015] In an exemplary embodiment of the present disclosure, a plurality of fixing holes are provided on the outer periphery of the bottom plate and are evenly distributed in the circumferential direction of the limiting groove. Internal threads are provided in the fixing holes; the pressing portion includes a U-shaped groove, and a stop portion is provided in the U-shaped groove;

[0016] The pressing assembly further includes:

[0017] A set screw, with external threads provided on the outer periphery. The set screw passes through the U-shaped groove and the fixing hole and is threadedly connected to the fixing hole; the end of the set screw away from the bottom plate abuts against the surface of the stop portion away from the bottom plate; rotating the set screw can move the pressing portion in a direction close to the bottom plate to press the flange.

[0018] In an exemplary embodiment of the present disclosure, the number of the avoidance holes is 11 to 16.

[0019] The positioning tooling of the present disclosure, after one side of the wheel hub is machined, the support ring can be placed in the limit groove in the bottom plate. This design effectively restricts the movement of the support ring in the transverse direction (e.g., in the X-axis and / or Y-axis directions). At the same time, during the operation process, any guide rail convex key can be flexibly selected to insert into the positioning groove, while the other guide rail convex keys are respectively inserted into the avoidance holes. Such a design effectively prevents the rotation or sliding of the wheel hub in the limit groove through the cooperation of the guide rail convex keys with the positioning groove and the avoidance holes, and significantly improves the alignment accuracy of the repeated positioning of the wheel hub. In addition, the tooling is also equipped with a pressing device for pressing the flange part of the wheel hub, thereby further restricting the movement of the wheel hub in the longitudinal direction (for example, the vertical direction). In summary, the positioning tooling of the present disclosure realizes the comprehensive positioning of the wheel hub in the transverse and longitudinal directions. Compared with the traditional manual alignment method, it not only has higher efficiency, but also the positioning accuracy is significantly improved.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the wheel hub.

[0023] Figure 2 It is a schematic diagram of the bottom plate in the embodiment of the present disclosure.

[0024] Figure 3 It is a schematic diagram of the assembly of the positioning tooling and the wheel hub in the embodiment of the present disclosure.

[0025] Figure 4 It is a top view of the bottom plate in the embodiment of the present disclosure.

[0026] Figure 5 It is a top view of the assembly of the positioning tooling and the wheel hub in the embodiment of the present disclosure.

[0027] Figure 6 In the embodiment of the present disclosure along Figure 5 The cross-sectional view after being cut along the dotted line in.

[0028] Figure 7 It is a schematic diagram of the pressing assembly in the embodiment of the present disclosure.

[0029] Figure 8 It is a side view of the pressing assembly in the embodiment of the present disclosure.

[0030] In the figure: 100, support ring; 200, guide rail key; 300, flange; 1, bottom plate; 101, fixing hole; 11, limiting groove; 12, positioning groove; 121, guiding groove; 122, fixing groove; 13, avoidance hole; 2, pressing component; 21, pressing part; 211, U-shaped groove; 22, supporting part; 23, stopping part; 3, fastening piece. Detailed implementation manners

[0031] Now, example embodiments will be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed descriptions will be omitted.

[0032] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the icon to another component, these terms are used in this specification only for convenience, for example, according to the directions of the examples described in the accompanying drawings. It can be understood that if the device of the icon is turned upside down, the component described as "upper" will become the component described as "lower". When a structure is "on" another structure, it may mean that a structure is integrally formed on another structure, or that a structure is "directly" disposed on another structure, or that a structure is "indirectly" disposed on another structure through another structure.

[0033] The terms "a", "an", "the" and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to mean an open inclusion and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc. The terms "first" and "second" are used only as labels and are not a limitation on the quantity of their objects.

[0034] Embodiments of the present disclosure provide a positioning tooling, which is used to position a hub, and the hub can be a wheel hub of an aircraft. As Figure 1 shown, the hub may include a support ring 100 and a plurality of guide rail keys 200 located at one end of the support ring 100. Among them, the support ring 100 may be in a circular ring shape and can be used for assembling a tire; the guide rail key 200 can be used for positioning or fixing. The guide rail key 200 may be in a columnar shape and may extend axially along the support ring 100 beyond the support ring 100, and the cross-section of the guide rail key 200 may be rectangular. The hub further includes a flange 300, and the flange 300 surrounds the periphery of the end of the support ring 100 close to the guide rail key 200 for one week.

[0035] As Figure 2and Figure 3 As shown in Figure 3 , the positioning tooling of the present disclosure may include a bottom plate 1 and a pressing device, where:

[0036] The bottom plate 1 has a limiting groove 11 recessed inward from the top surface. The bottom surface of the limiting groove 11 is provided with a positioning groove 12 and a plurality of avoidance holes 13. The end of the guide rail convex key 200 in the support ring 100 can be clamped in the limiting groove 11. One of the guide rail convex keys 200 in each guide rail convex key 200 is inserted into the positioning groove 12, and the remaining guide rail convex keys 200 are respectively inserted into different avoidance holes 13;

[0037] The pressing device is arranged on the bottom plate 1. When the support ring 100 is clamped in the limiting groove 11, the pressing device can press the flange 300.

[0038] For the positioning tooling of the present disclosure, when one side of the hub is processed, the support ring 100 can be placed in the limiting groove 11 in the bottom plate 1. This design effectively limits the movement of the support ring 100 in the transverse direction (such as the X-axis and / or Y-axis directions). At the same time, during the operation process, any guide rail convex key 200 can be flexibly selected and inserted into the positioning groove 12, while the other guide rail convex keys 200 are respectively inserted into the avoidance holes 13. Such a design effectively prevents the rotation or sliding of the hub in the limiting groove 11 through the cooperation of the guide rail convex key 200 with the positioning groove 12 and the avoidance holes 13, and significantly improves the alignment accuracy of the repeated positioning of the hub. In addition, the tooling is also equipped with a pressing device for pressing the flange 300 part of the hub, thereby further restricting the movement of the hub in the longitudinal direction (such as the vertical direction). In summary, the positioning tooling of the present disclosure realizes the comprehensive positioning of the hub in the transverse and longitudinal directions. Compared with the traditional manual alignment method, it not only has higher efficiency, but also significantly improves the positioning accuracy.

[0039] The following will detail each part and its specific details of the positioning tooling in the embodiments of the present disclosure:

[0040] As Figure 2 shown, the bottom plate 1 can be in a plate shape, and its cross-section can be circular, elliptical or rectangular, etc. The bottom plate 1 can be made of a high-strength and wear-resistant metal material to ensure that it can withstand a large load and maintain a stable structure during use.

[0041] Please continue to refer to Figure 2As shown, the bottom plate 1 may have a limit groove 11, and the limit groove 11 can be used to clamp the end of the support ring 100 with the guide rail convex key 200. The limit groove 11 may be formed by inward depression from the top surface of the bottom plate 1, and the components (such as the support ring 100) that cooperate with it can be restricted and fixed through the limit groove 11. The shape of the limit groove 11 is the same as the shape of the support ring 100. For example, when the support ring 100 is circular, the shape of the limit groove 11 is also circular. The diameter of the limit groove 11 may be slightly larger than the diameter of the support ring 100. For example, the difference between the diameter of the limit groove 11 and the diameter of the support ring 100 is less than 0.03 mm. For example, the difference between the diameter of the limit groove 11 and the diameter of the support ring 100 is 0.03 mm; or, the difference between the diameter of the limit groove 11 and the diameter of the support ring 100 is 0.02 mm; or, the difference between the diameter of the limit groove 11 and the diameter of the support ring 100 is 0.01 mm.

[0042] Please continue to refer to Figure 2 As shown, the bottom surface of the limit groove 11 may be a plane, and a positioning groove 12 and a plurality of avoidance holes 13 may be provided on its bottom surface. The positioning groove 12 and the avoidance holes 13 can respectively cooperate with different guide rail convex keys 200 to restrict the support ring 100 connected to the guide rail convex key 200 from slipping or rotating.

[0043] In an exemplary embodiment of the present disclosure, as Figure 4 shown, the positioning groove 12 may include a guiding groove 121 and a fixing groove 122 that communicate with each other along a direction parallel to the bottom plate 1, wherein the guiding groove 121 may be located on the side of the fixing groove 122 close to the center of the limit groove 11. The shapes of the fixing groove 122 and the guiding groove 121 can both match the cross-sectional shape of the guide rail convex key 200, so that both the fixing groove 122 and the guiding groove 121 can be closely fitted with the guide rail convex key 200. For example, when the shape of the guide rail convex key 200 is rectangular, the shapes of the positioning groove 12 and the guiding groove 121 can both be rectangular.

[0044] In an exemplary embodiment of the present disclosure, the guiding groove 121 may include a first through hole and a second through hole that communicate with each other. The first through hole is located on the side of the second through hole close to the bottom surface of the limit groove 11. The included angle between the side wall of the first through hole and the central axis of the limit groove 11 is greater than or equal to 10° and less than or equal to 30°. For example, the included angle between the side wall of the first through hole and the central axis of the limit groove 11 can be 10°, 15°, 20°, 25° or 30°. Of course, the included angle between the side wall of the first through hole and the central axis of the limit groove 11 can also be other values, which will not be listed one by one here. In the depth direction of the limit groove 11, the size of the first through hole increases sequentially from bottom to top, and the second through hole can be a straight hole. For example, the side wall of the first through hole can be inclined, so that when the guide rail convex key 200 is assembled with the positioning groove 12, the guide rail convex key 200 can quickly slide in through the first through hole, which is convenient for assembly.

[0045] In an exemplary embodiment of the present disclosure, the gap between the positioning groove 12 and the guide rail key 200 is less than 0.03 microns. For example, the gap between the positioning groove 12 and the guide rail key 200 may be 0.03 microns; or, the gap between the positioning groove 12 and the guide rail key 200 may be 0.02 microns; or, the gap between the positioning groove 12 and the guide rail key 200 may be 0.01 microns. Such a design can prevent the guide rail key 200 from shaking in the positioning groove 12 during processing, which helps to reduce the geometric tolerance of the drawing on both sides of the part, and under this design, the geometric tolerance is within 0.03 microns.

[0046] The avoidance hole 13 may penetrate the bottom surface of the limiting groove 11 along the thickness direction of the bottom plate 1, that is, the avoidance hole 13 may be a through hole. The avoidance hole 13 may be a circular hole, an elliptical hole, a rectangular hole, a polygonal hole or an irregular hole structure, and the shape of the avoidance hole 13 is not particularly limited here. The positioning groove 12 and the plurality of avoidance holes 13 may be distributed in a ring shape around the central axis of the limiting groove 11, and may be evenly arranged at equal intervals.

[0047] The total number of the positioning grooves 12 and the avoidance holes 13 may be at least equal to the number of the guide rail convex keys 200. One of the guide rail convex keys 200 may be inserted into the positioning groove 12, and the remaining guide rail convex keys 200 may be respectively inserted into different avoidance holes 13. The top view of the structure after the guide rail convex keys 200 are inserted into the positioning grooves 12 and the avoidance holes 13 is as shown in FIG. Figure 5 shown; along Figure 5 The cross-section diagram cut by the dashed line is as follows Figure 6 During operation, any guide rail key 200 can be flexibly selected to be inserted into the positioning groove 12, while the other guide rail keys 200 are respectively inserted into the avoidance holes 13. This design effectively prevents the wheel hub from rotating or slipping in the limiting groove 11 through the cooperation between the guide rail key 200 and the positioning groove 12 and the avoidance holes 13, and significantly improves the alignment accuracy of the wheel hub for repeated positioning.

[0048] In some embodiments of the present disclosure, the number of the avoidance holes 13 may be greater than the number of the guide rail cams 200, that is, the avoidance holes 13 may be redundantly designed, which may reduce the weight of the positioning tooling to a certain extent, help reduce the labor intensity of workers, and improve the operability of the positioning tooling. For example, when the number of the guide rail cams 200 is 8, the number of the avoidance holes 13 may be 11 to 16, for example, the number of the avoidance holes 13 may be 11, 12, 13, 14, 15 or 16.

[0049] The clamping device may be disposed on the bottom plate 1. When the support ring 100 is clamped in the limiting groove 11, the clamping device can clamp the flange 300. For example, the clamping device can be detachably fixed to the bottom plate 1. In some embodiments of the present disclosure, the clamping device may include a plurality of clamping components 2. Please continue to refer toFigure 3 and Figure 5 As shown in and

[0050] , a plurality of pressing components 2 can be evenly distributed along the circumferential direction of the limiting groove 11. Different pressing components 2 can be used to press different regions of the flange 300 respectively, so that different regions of the flange 300 can be evenly stressed, and then the flange 300 can be pressed.

[0050] In an exemplary embodiment of the present disclosure, as shown in Figure 7 and Figure 8 , the pressing component 2 may include a pressing part 21 and a supporting part 22 which are connected to each other. Among them, the supporting part 22 may be in a block shape, and one end of the supporting part 22 may have a supporting surface, and the supporting surface may be a plane and may be in contact with the surface of the bottom plate 1. The pressing part 21 may also be in a block shape and may be connected to the end of the supporting part 22 far from the bottom plate 1. For example, the pressing part 21 may be connected to the side surface of the end of the supporting part 22 far from the bottom plate 1 and may extend toward the side close to the limiting groove 11 in a direction parallel to the bottom plate 1. The length of the pressing part 21 extending inward may be less than the width of the flange 300 and greater than half of the width of the flange 300. The pressing part 21 can be used to press the flange 300 so as to limit the flange 300 in the longitudinal direction, which helps to improve the positioning accuracy of the hub.

[0051] In an exemplary embodiment of the present disclosure, the materials of the pressing part 21 and the supporting part 22 may be the same. For example, the materials of the pressing part 21 and the supporting part 22 may both be rigid materials such as metal, alloy or stainless steel. To ensure the structural strength of the pressing component 2, the pressing part 21 and the supporting part 22 may be an integral structure, and the pressing part 21 and the supporting part 22 may be formed by an integral molding process.

[0052] In some embodiments of the present disclosure, the pressing part 21 may be detachably connected to the bottom plate 1. For example, as shown in Figure 2 and Figure 4 , a plurality of fixing holes 101 may be provided on the outer periphery of the bottom plate 1, and the plurality of fixing holes 101 may be evenly distributed along the circumferential direction of the limiting groove 11. For example, the number of the fixing holes 101 may be 3 to 15. For example, it may be 3, 6, 9, 12 or 15. Of course, the number of the fixing holes 101 may also be other numbers, which will not be listed one by one here. The fixing holes 101 may extend in a direction perpendicular to the surface of the bottom plate 1, and the fixing holes 101 may be through holes or blind holes, and no special limitation is made here. The shape of the fixing holes 101 may be circular, and internal threads may be provided therein.

[0053] Please continue to refer to Figure 3 , Figure 5 , Figure 7 and Figure 8 . Figure 3 、 Figure 5 、 Figure 7 and Figure 8 ​​​​​​​​As shown, the pressing part 21 may have a U-shaped groove 211. The U-shaped groove 211 may penetrate through the bottom plate 1 in a direction perpendicular to the bottom plate 1, and the opening of the U-shaped groove 211 may face the limiting groove 11. The projection of the U-shaped groove 211 on the bottom plate 1 coincides with the fixing hole 101. A stop portion 23 may be provided in the U-shaped groove 211. In some embodiments of the present disclosure, the stop portion 23 may be a stepped structure on the side wall of the U-shaped groove 211, and the stepped surface may face away from the bottom plate 1. In some other embodiments of the present disclosure, the stop portion 23 may be in a sheet shape and may be parallel to the bottom plate 1. One side edge of the stop portion 23 may be connected to the inner wall of the U-shaped groove 211. For example, the stop portion 23 may be a rectangular sheet, and the number thereof may be two. The two rectangular sheets may be respectively connected to two side edges distributed oppositely in the U-shaped groove 211, and in the direction parallel to the bottom plate 1, the side edges of the two rectangular sheets away from the side wall of the U-shaped groove 211 are distributed oppositely, that is, the heights of the two rectangular sheets from the bottom plate 1 are equal. In some other embodiments of the present disclosure, the stop portion 23 may also be in a U shape. For example, it may be a U-shaped sheet, and the outer wall of the U-shaped sheet is conformally connected to the inner wall of the U-shaped groove 211.

[0054] The pressing assembly 2 of the present disclosure further includes a set screw 3. External threads may be provided on the outer periphery of the set screw 3. The set screw 3 may pass through the U-shaped groove 211 and the fixing hole 101 and be threadedly connected to the fixing hole 101. At this time, the end of the set screw 3 away from the bottom plate 1 may abut against the surface of the stop portion 23 away from the bottom plate 1. Rotating the set screw 3 can move the pressing part 21 in a direction close to the bottom plate 1 to press the flange 300. The material of the set screw 3 may be metal, alloy, stainless steel, etc. Of course, it may also be other materials with relatively high rigidity, which will not be listed one by one here. For example, the set screw 3 may be a screw or a bolt. The pressing assembly 2 can be detachably connected to the wall plate by a screw or a bolt.

[0055] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and embodiments are only to be regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

Claims

1. A positioning tooling for positioning a wheel hub, the wheel hub including a support ring and a plurality of guide rail convex keys located at one end of the support ring, the guide rail convex keys extending axially outward along the support ring, the wheel hub further including a flange surrounding the periphery of the end of the support ring close to the guide rail convex keys, characterized in that, The positioning tooling includes: A bottom plate having a limiting groove recessed inward from the top surface. The bottom surface of the limiting groove is provided with a positioning groove and a plurality of avoidance holes. The end of the guide rail key in the support ring can be clamped in the limiting groove. One of the guide rail keys among the guide rail keys passes through the positioning groove, and the remaining guide rail keys respectively pass through different avoidance holes; A pressing device arranged on the bottom plate. When the support ring is clamped in the limiting groove, the pressing device can press the flange.

2. The positioning tooling according to claim 1, wherein, The pressing device includes a plurality of pressing components evenly distributed along the circumference of the limiting groove. The pressing component includes a pressing part and a supporting part connected to each other. One end of the supporting part is in contact with the surface of the bottom plate; the pressing part is connected to the end of the supporting part away from the bottom plate and extends in a direction parallel to the bottom plate. The pressing part is detachably connected to the bottom plate, and the pressing part can press the flange.

3. The positioning tooling according to claim 1, wherein, The positioning groove includes a guiding groove and a fixing groove communicating with each other along a direction parallel to the bottom plate. The guiding groove includes a through first through hole and a second through hole. The first through hole is located on the side of the second through hole close to the bottom surface of the limiting groove. The included angle between the side wall of the first through hole and the central axis of the limiting groove is greater than or equal to 10° and less than or equal to 30°; and in the depth direction of the limiting groove, the size of the opening of the first through hole gradually increases from bottom to top; the second through hole is a straight hole.

4. The positioning tooling according to any one of claims 1-3, characterized in that, The positioning groove and the plurality of avoidance holes are annular and evenly distributed at equal intervals.

5. The positioning tooling according to claim 3, characterized in that, Both the guiding groove and the fixing groove are rectangular grooves, and the avoidance holes are circular holes.

6. The positioning tooling according to claim 4, characterized in that, The number of the avoidance holes is greater than the number of the guide rail keys.

7. The positioning tooling according to any one of claims 1-3, characterized in that, The gap between the positioning groove and the guide rail key is less than 0.03 microns.

8. The positioning tooling according to claim 2, wherein, The pressing part and the supporting part are of an integral structure.

9. The positioning tooling according to claim 2, wherein A plurality of fixing holes evenly distributed along the circumference of the limiting groove are provided on the outer periphery of the bottom plate, and internal threads are provided in the fixing holes; the pressing part includes a U-shaped groove, and a stop part is provided in the U-shaped groove; The pressing component further includes: A set screw having an external thread on its outer periphery. The set screw passes through the U-shaped groove and the fixing hole and is threadedly connected to the fixing hole; the end of the set screw away from the bottom plate abuts against the surface of the stop part away from the bottom plate; rotating the set screw can make the pressing part move towards the bottom plate to press the flange.

10. The positioning tooling according to claim 6, characterized in that, The number of the avoidance holes is 11 to 16.

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