Carbon fiber sleeve grinding tool

Abstract

The utility model provides a carbon fiber sleeve grinding tool, including a mandrel, a tensioning sleeve and a clamping mechanism. The tensioning section of the mandrel has a taper, and the inner conical hole of the tensioning sleeve is matched with the outer conical surface of the tensioning section. When in use, the tensioning sleeve is installed on the mandrel, and then the carbon fiber sleeve to be processed is set on the outer periphery of the tensioning sleeve. The clamping mechanism is used to push the tensioning sleeve to move toward the large diameter end of the tensioning section, so that the radial size of the tensioning sleeve is expanded, and the tensioning sleeve can fit the inner wall of the carbon fiber sleeve. With the transmission of force, the carbon fiber sleeve, the tensioning sleeve and the mandrel can be fixed as a whole. The utility model can be used for the processing of cylindrical parts with thin wall thickness such as carbon fiber sleeves. After installation, it can be fixed as a whole with the parts, and will not cause damage to the parts during clamping. The clamping has high coaxiality, which helps to ensure the processing accuracy.

Description

Technical Field

[0001] The utility model belongs to the technical field of carbon fiber sleeve processing, and in particular relates to a carbon fiber sleeve grinding tool. Background Art

[0002] The carbon fiber sleeve can be used as a part of the magnetic levitation blower. At present, the rotor speed of the magnetic levitation blower is basically above 20000r / min. Under high-speed rotation, the fixing requirements of the rotor magnet are relatively high. At present, the installation and fixing method of the magnetic steel in the magnetic levitation blower is usually surface mounting, that is, the inner surface of the magnetic steel is coated with strong glue, pasted to the rotor core, and then pressed and fixed with the carbon fiber sleeve.

[0003] Carbon fiber is a composite material, and the produced carbon fiber sleeve needs to be ground to meet the design dimensional accuracy requirements. However, the carbon fiber sleeve used on the magnetic levitation blower is thin, but has a large diameter and a wall thickness of several millimeters. If the traditional mechanical clamping method is used, the side wall of the part is easily deformed by the clamping force, resulting in damage or scrapping of the part, which brings difficulties to processing. Utility Model Content

[0004] The utility model provides a carbon fiber sleeve grinding tool, aiming to solve the problem in the prior art that the carbon fiber sleeve is difficult to clamp during processing.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a carbon fiber sleeve grinding tool, including:

[0006] The core shaft has a first connecting section and a tightening section which are sequentially arranged along the axial direction, the diameter of the tightening section is larger than the diameter of the first connecting section, the outer peripheral surface of the tightening section has a taper, and the small diameter end of the tightening section is adjacent to the first connecting section;

[0007] A tension sleeve is sleeved on the tension section, the tension sleeve has a tapered hole that matches the taper of the tension section, and at least one tension slit is respectively formed at both ends of the tension sleeve, the tension slit extends along the axial direction of the tension sleeve and penetrates the wall thickness of the tension sleeve; and

[0008] The clamping mechanism cooperates with the first connecting section and acts on one end of the tension sleeve adjacent to the first connecting section to provide a first pre-tightening force for the tension sleeve to move toward the large-diameter end of the tension section.

[0009] In a possible implementation, the pressing mechanism includes:

[0010] a first end cover, slidably fitted in the first connecting section, and

[0011] The first nut is arranged on a side of the first end cover away from the tension sleeve and is threadably matched with the first connecting section.

[0012] In a possible implementation, a side wall of the first end cover is provided with a plurality of ventilation holes along its circumference.

[0013] In a possible implementation, the mandrel further includes a second connecting section, which is disposed on a side of the tensioning section away from the first connecting section;

[0014] The carbon fiber sleeve grinding tool also includes a disassembly mechanism, which cooperates with the second connecting section and acts on one end of the tension sleeve adjacent to the second connecting section to provide the tension sleeve with a second preload force to move toward the small diameter end of the tension section.

[0015] In a possible implementation, the disassembly mechanism includes:

[0016] a second end cover, slidably fitted in the second connecting section, and

[0017] The second nut is arranged on a side of the second end cover away from the tension sleeve and is threadably matched with the second connecting section.

[0018] In a possible implementation manner, ends of the first connecting segment and the second connecting segment are respectively provided with clamping portions, and a radial cross-section of the clamping portions is a hexagon.

[0019] In a possible implementation, a process hole is provided on the end surface of the clamping portion.

[0020] In a possible implementation, the taper of the tensioning section is 1:100.

[0021] In a possible implementation, the axial length of the tensioning section is greater than the axial length of the tensioning sleeve.

[0022] In a possible implementation, the tension sleeve is provided with a stress relief hole at the end of the tensioning slit. The stress relief hole is a circular hole that penetrates the wall thickness of the tension sleeve. The diameter of the stress relief hole is greater than the width of the tensioning slit.

[0023] Compared with the prior art, the carbon fiber sleeve grinding tool provided by the utility model has the following beneficial effects:

[0024] The carbon fiber sleeve grinding tool provided by the utility model includes a mandrel, a tensioning sleeve and a clamping mechanism. The tensioning section of the mandrel has a taper, and the inner conical hole of the tensioning sleeve is matched with the outer conical surface of the tensioning section. When in use, the tensioning sleeve is installed on the mandrel, and then the carbon fiber sleeve to be processed is set on the outer periphery of the tensioning sleeve, and the clamping mechanism is used to push the tensioning sleeve to move toward the large diameter end of the tensioning section, so that the radial size of the tensioning sleeve is expanded, and the tensioning sleeve can fit the inner wall of the carbon fiber sleeve. With the transmission of force, the carbon fiber sleeve, the tensioning sleeve and the mandrel can be fixed as a whole. Then the mandrel can be placed on the machine tool for processing, and the clamping mechanism on the machine tool can firmly clamp the mandrel.

[0025] The utility model can be used for processing cylindrical parts with thin wall thickness such as carbon fiber sleeves, and can be fixed with the parts as a whole after installation, and will not cause damage to the parts during clamping, and the clamping coaxiality is high, which helps to ensure the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a carbon fiber sleeve grinding tool provided in one embodiment of the utility model;

[0027] Figure 2 An internal cross-sectional view of a carbon fiber sleeve grinding tool provided in one embodiment of the utility model;

[0028] Figure 3 An exploded diagram of a carbon fiber sleeve grinding tool provided in one embodiment of the utility model;

[0029] Figure 4 for Figure 3 A partial enlarged view of part A in the middle.

[0030] Description of reference numerals:

[0031] 1. Carbon fiber sleeve grinding tooling;

[0032] 10. Mandrel; 11. First connecting section; 111. Clamping portion; 112. Process hole; 12. Tightening section; 13. Second connecting section;

[0033] 20. Tension sleeve; 21. Tension seam; 22. Stress relief hole;

[0034] 30. Clamping mechanism; 31. First end cover; 311. Ventilation hole; 32. First nut;

[0035] 40. Disassembly mechanism; 41. Second end cover; 42. Second nut. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] It should be noted that when an element is referred to as being "fixed to", "fixed" or "fixedly disposed" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" or "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. When an element is referred to as being "set to" or "disposed on" another element, it may be directly on the other element or there may be a central element. "Multiple" refers to two or more quantities. "At least one" refers to one or more quantities. "Several" refers to one or more quantities.

[0038] 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 belongs.

[0039] Please also read Figures 1 to 4 , the carbon fiber sleeve grinding tool 1 provided in the embodiment of the utility model is described below.

[0040] See also Figure 1 , Figure 2 and Figure 3 The embodiment of the utility model provides a carbon fiber sleeve grinding tool 1, including a mandrel 10, a tensioning sleeve 20 and a clamping mechanism 30. The mandrel 10 has a first connecting section 11 and a tensioning section 12 arranged in sequence along the axial direction. The diameter of the tensioning section 12 is greater than the diameter of the first connecting section 11. The outer peripheral surface of the tensioning section 12 has a taper, and the small diameter end of the tensioning section 12 is adjacent to the first connecting section 11; the tensioning sleeve 20 is sleeved on the tensioning section 12, and the tensioning sleeve 20 has a tapered hole adapted to the taper of the tensioning section 12. At least one tensioning slit 21 is respectively opened at both ends of the tensioning sleeve 20, and the tensioning slit 21 extends along the axial direction of the tensioning sleeve 20 and penetrates the wall thickness of the tensioning sleeve 20; the clamping mechanism 30 cooperates with the first connecting section 11, and the clamping mechanism 30 acts on one end of the tensioning sleeve 20 adjacent to the first connecting section 11, so as to provide a first pre-tightening force for the tensioning sleeve 20 to move toward the large diameter end of the tensioning section 12.

[0041] Compared with the prior art, the carbon fiber sleeve grinding tool 1 provided in the embodiment of the utility model has the following beneficial effects:

[0042] The carbon fiber sleeve grinding tool 1 provided by the embodiment of the utility model comprises a mandrel 10, a tension sleeve 20 and a clamping mechanism 30. The tensioning section 12 of the mandrel 10 has a certain taper, and the inner conical hole of the tension sleeve 20 is matched with the outer conical surface of the tensioning section 12. When in use, the tension sleeve 20 is installed on the mandrel 10, and then the carbon fiber sleeve to be processed is set on the outer periphery of the tension sleeve 20. The clamping mechanism 30 is used to push the tension sleeve 20 to move toward the large diameter end of the tensioning section 12, so that the radial size of the tension sleeve 20 is expanded, and the tension sleeve 20 can fit the inner wall of the carbon fiber sleeve. With the transmission of force, the carbon fiber sleeve, the tension sleeve 20 and the mandrel 10 can be fixed as a whole. Then the mandrel 10 can be placed on the machine tool for processing, so that the clamping mechanism (such as a three-jaw chuck, a top screw, etc.) on the machine tool can firmly clamp the mandrel 10.

[0043] The embodiment of the utility model can be used for processing cylindrical parts with thin wall thickness such as carbon fiber sleeves. After installation, it can be fixed with the parts as a whole, and will not cause damage to the parts during clamping. The clamping has high coaxiality, which helps to ensure processing accuracy.

[0044] In the embodiment of the utility model, the mandrel 10 is a stepped shaft, having at least a first connecting section 11 and a tensioning section 12. The tensioning section 12 has a certain taper, and the specific taper is not limited, and can be 1:100, 1:70, etc. The first connecting section 11 is coaxially connected to the tensioning section 12, and the first connecting section 11 is used to install a clamping mechanism 30. The clamping mechanism 30 can move axially along the first connecting section 11. When the clamping mechanism 30 approaches the tensioning sleeve 20, it can push the tensioning sleeve 20 to move toward the large diameter end to achieve radial expansion, thereby tightening the carbon fiber sleeve from the inner hole, so that the tensioning sleeve 20, the carbon fiber sleeve and the mandrel 10 are connected as one, and then the mandrel 10 is fixed on the machine tool to grind the carbon fiber sleeve.

[0045] The tension sleeve 20 can be made of aluminum alloy or other metal materials. Aluminum alloy has a small elastic modulus and is more deformed under the same force, making it easy to fix the carbon fiber sleeve. The outer diameter of the tension sleeve 20 is slightly smaller than the inner hole diameter of the carbon fiber sleeve. The inner hole of the tension sleeve 20 is also a conical structure, and the diameter taper from the left end face to the right end face is 1:100. At the same time, four tensioning seams 21 with a width of 5 mm can be processed at both ends of the tension sleeve 20. When multiple tensioning seams 21 are opened at each end of the tension sleeve 20, the multiple tensioning seams 21 are arranged at equal intervals along the circumferential direction, and the tensioning seams 21 opened at both ends are staggered in the axial direction and do not interfere with each other.

[0046] The clamping mechanism 30 is used to provide a first pre-tightening force for the tensioning sleeve 20 to move toward the large diameter end of the tensioning section 12 . The clamping mechanism 30 may be a structure such as a pressure block or a screw that can move axially along the first connecting section 11 .

[0047] See also Figure 1 , Figure 2 and Figure 3 In some possible embodiments, the clamping mechanism 30 includes a first end cover 31 and a first nut 32. The first end cover 31 is slidably fitted in the first connecting section 11. The first nut 32 is arranged on a side of the first end cover 31 away from the tensioning sleeve 20 and is threadedly fitted in the first connecting section 11.

[0048] In this embodiment, the clamping mechanism 30 includes a first end cap 31 and a first nut 32. The first end cap 31 is slidably disposed on the first connecting section 11. The first connecting section 11 is provided with a thread at the position where the first nut 32 cooperates. By rotating the first nut 32, the first end cap 31 can be pushed against the tension sleeve 20, thereby achieving tension and fixation of the carbon fiber sleeve. A groove can be provided on the outer periphery of the first nut 32 for easy rotation and tightening.

[0049] See also Figures 1 to 4 In some possible embodiments, a plurality of vent holes 311 are provided on the side wall of the first end cover 31 along its circumference to facilitate gas discharge when the end cover is installed.

[0050] See also Figures 1 to 3 In some possible embodiments, the core shaft 10 also includes a second connecting section 13, which is arranged on a side of the tensioning section 12 away from the first connecting section 11; the carbon fiber sleeve grinding tool 1 also includes a disassembly mechanism 40, which cooperates with the second connecting section 13, and the disassembly mechanism 40 acts on one end of the tensioning sleeve 20 adjacent to the second connecting section 13, and is used to provide a second pre-tightening force for the tensioning sleeve 20 to move toward the small diameter end of the tensioning section 12.

[0051] In this embodiment, the disassembly mechanism 40 can have the same structure as the clamping mechanism 30. The disassembly mechanism 40 is arranged in the second connecting section 13. When the carbon fiber sleeve is processed, the clamping mechanism 30 is removed, and then the tension sleeve 20 is pushed from the large diameter end to the small diameter section through the disassembly mechanism 40 to separate the tension sleeve 20 and the carbon fiber sleeve.

[0052] See also Figures 1 to 3 In some possible embodiments, the disassembly mechanism 40 includes a second end cap 41 and a second nut 42. The second end cap 41 is slidably matched with the second connecting section 13, and the second nut 42 is disposed on a side of the second end cap 41 away from the tension sleeve 20 and is threadedly matched with the second connecting section 13.

[0053] In this embodiment, the second end cover 41 has the same structure as the first end cover 31, and the second nut 42 has the same structure as the first nut 32. When the processing is completed, the first end cover 31 and the first nut 32 are removed, and then the second end cover 41 and the second nut 42 are installed from the second connecting section 13 to separate the carbon fiber sleeve, the tension sleeve 20 and the core shaft 10.

[0054] See also Figure 1 and Figure 3 In some possible embodiments, the ends of the first connecting section 11 and the second connecting section 13 are respectively provided with a clamping portion 111, and the radial cross section of the clamping portion 111 is hexagonal, so as to facilitate the use of a clamp to fix the first nut 32 and the second nut 42 when tightening them.

[0055] See also Figure 3 and Figure 4 In some possible embodiments, a process hole 112 is provided on the end face of the clamping portion 111. The process hole 112 is specifically a deep hole with a taper arranged at the center of the end face of the clamping portion 111, which is convenient for top fixation during grinding of the carbon fiber sleeve. The taper can be processed according to the taper of the top screw of the grinder.

[0056] In some possible embodiments, the taper of the tensioning section 12 is 1:100, and the diameter increases by 1 mm for every 100 mm increase in the axial length.

[0057] See also Figure 2 In some possible embodiments, the axial length of the tensioning section 12 is greater than the axial length of the tensioning sleeve 20, and the axial length of the tensioning sleeve 20 is greater than the length of the carbon fiber sleeve to be processed, so as to avoid the tensioning sleeve 20 being partially suspended during the movement toward the large diameter end, thereby affecting the processing accuracy of the carbon fiber sleeve.

[0058] See also Figure 1 and Figure 3 In some possible embodiments, the tension sleeve 20 is provided with a stress relief hole 22 at the end of the tensioning slit 21. The stress relief hole 22 is a circular hole that penetrates the wall thickness of the tension sleeve 20. The diameter of the stress relief hole 22 is greater than the width of the tensioning slit 21. The purpose of providing the stress relief hole 22 at the end of the tensioning slit 21 is to reduce stress concentration and make the expansion more uniform. The diameter of the stress relief hole 22 is greater than the groove width of the tensioning slit 21. The diameter of the stress relief hole 22 can be 10 mm.

[0059] When installing and fixing the carbon fiber sleeve: first place the core shaft 10 horizontally, with the cone surface with a small diameter at the left end and the large cone surface at the right end, and the large cone surface of the tension sleeve 20 enters from the left end of the core shaft 10 until the tension sleeve 20 is completely in contact with the cone surface of the core shaft 10, at which time the tension sleeve 20 can no longer move; then insert the carbon fiber sleeve from the left end and move it to a suitable position on the tension sleeve 20; finally, install the first end cover 31 until its right end surface contacts the left end surface of the tension sleeve 20, and screw on the first nut 32; at this time, the tension sleeve 20 is in an unexpanded state, and the carbon fiber sleeve can move freely.

[0060] Use a wrench or other tool to tighten the first nut 32, the first nut 32 pushes the first end cap 31 to move, and finally pushes the tension sleeve 20 to move to the right. The tension sleeve 20 is expanded by the circumferential expansion force of the mandrel 10 until the tension sleeve 20 contacts the carbon fiber sleeve. At this time, continue to tighten the first nut 32. With the transmission of force, there is an extrusion force between the tension sleeve 20 and the carbon fiber sleeve. At this time, the carbon fiber sleeve is fixed. Next, the entire installed tooling is fixed to the top screw of the grinder through the tapered process holes 112 at both ends for grinding.

[0061] After processing, remove the first nut 32 and the first end cover 31, then install the second end cover 41 and the second nut on the right end, tighten the second nut with a wrench, and as the force increases, the tensioning sleeve 20 and the carbon fiber sleeve move to the left end as a whole until the tensioning sleeve 20 reaches the position when it was first installed. At this time, the processed carbon fiber sleeve and the tensioning sleeve 20 can be removed together to complete the grinding of the carbon fiber sleeve.

[0062] It can be understood that the various parts in the above-mentioned embodiments can be freely combined or deleted to form different combination embodiments. The specific contents of each combination embodiment will not be repeated here. After this description, it can be considered that the utility model specification has recorded various combination embodiments and can support different combination embodiments.

[0063] 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. Carbon fiber sleeve grinding tool, characterized in that: include: A core shaft, comprising a first connecting section and a tightening section arranged in sequence along the axial direction, wherein the diameter of the tightening section is larger than the diameter of the first connecting section, the outer peripheral surface of the tightening section has a taper, and the small diameter end of the tightening section is adjacent to the first connecting section; A tension sleeve is sleeved on the tension section, the tension sleeve has a tapered hole adapted to the taper of the tension section, and at least one tension slit is respectively formed at both ends of the tension sleeve, the tension slit extends along the axial direction of the tension sleeve and penetrates the wall thickness of the tension sleeve; as well as A clamping mechanism cooperates with the first connecting section, and acts on one end of the tension sleeve adjacent to the first connecting section to provide a first pre-tightening force for the tension sleeve to move toward the large-diameter end of the tension section.

2. The carbon fiber sleeve grinding tool according to claim 1, characterized in that: The clamping mechanism comprises: a first end cover, slidably fitted in the first connecting section, and The first nut is arranged on a side of the first end cover away from the tension sleeve and is threadably matched with the first connecting section.

3. The carbon fiber sleeve grinding tool according to claim 2, characterized in that: The side wall of the first end cover is provided with a plurality of ventilation holes along its circumference.

4. The carbon fiber sleeve grinding tool according to claim 1, characterized in that: The mandrel further comprises a second connecting section, which is arranged on a side of the tensioning section away from the first connecting section; The carbon fiber sleeve grinding tool also includes a disassembly mechanism, which cooperates with the second connecting section and acts on one end of the tension sleeve adjacent to the second connecting section to provide a second preload force for the tension sleeve to move toward the small diameter end of the tension section.

5. The carbon fiber sleeve grinding tool according to claim 4, characterized in that: The disassembly mechanism comprises: a second end cap, slidably fitted in the second connecting section, and The second nut is arranged on a side of the second end cover away from the tension sleeve and is threadably matched with the second connecting section.

6. The carbon fiber sleeve grinding tool according to claim 4, characterized in that: The ends of the first connecting section and the second connecting section are respectively provided with clamping portions, and the radial cross-section of the clamping portions is hexagonal.

7. The carbon fiber sleeve grinding tool according to claim 6, characterized in that: The end surface of the clamping part is provided with a process hole.

8. The carbon fiber sleeve grinding tool according to claim 1, characterized in that: The taper of the tightening section is 1:

100.

9. The carbon fiber sleeve grinding tool according to claim 1, characterized in that: The axial length of the tensioning section is greater than the axial length of the tensioning sleeve.

10. The carbon fiber sleeve grinding tool according to claim 1, characterized in that: The tension sleeve is provided with a stress relief hole at the end of the tensioning slit. The stress relief hole is a circular hole and penetrates the wall thickness of the tension sleeve. The diameter of the stress relief hole is greater than the width of the tensioning slit.

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