JP2004282890A - Method for attaching main shaft body to rotor and processing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for attaching a main shaft body to a rotor and processing equipment, wherein the length of a main shaft body in the direction of rotating shaft at fitting portion is reduced, thereby the amount of bend in the main shaft body can be reduced and the main shaft can be rotated with higher accuracy. <P>SOLUTION: The attaching method is for attaching the main shaft body (14) to the rotor (16) of a motor by fitting, and a length (m) of the fitting portion in the direction of the rotating shaft (Zr) is made shorter than a length (L) of the rotor in the direction of the rotating shaft. The fitting width ratio (m/L), expressed by the ratio of the length of the fitting portion in the direction of the rotating shaft to the length of the rotor in the direction of the rotating shaft, is set to be within a predetermined range. The main shaft body is attached with tightening force corresponding thereto. When the main shaft body is attached to the rotor with a sleeve in-between, the following procedure is followed: a substantially annular projection is formed inside the sleeve or outside the main shaft body, the length of the projection in the direction of the rotating shaft is made shorter than the length of the rotor in the direction of the rotating shaft, the rotor and the sleeve are fitted together, and the sleeve, and the main shaft body are fitted together at the projection. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of attaching a spindle to a rotor of a motor and an apparatus for machining the apparatus having a rotating spindle.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various types of processing apparatuses that provide a cutting tool or the like on a rotating main body and rotate the main body with a motor to perform processing have been put to practical use.
FIG. 5A schematically shows the structure of the motor 10. The motor 10 has a yoke 12 as a housing and a stator 18 (magnet or the like) provided on the yoke 12. A rotor 16 (such as an iron core and a coil) is provided inside the stator 18, and when the coil is energized, the rotor 16 rotates about the axis Zr as a rotation axis. The main shaft 14 supported by bearings 15 is attached to the rotor 16.
Next, a conventional attachment method for attaching the main shaft body 14 to the rotor 16 of the motor 10 will be described with reference to FIGS.
FIG. 5B shows a state where the rotor 16 and the main shaft body 14 are directly shrink-fitted. In particular, in the case of the main shaft 14 used at high speed rotation, the rotor 16 of the motor 10 is shrink-fitted (sometimes by cold fitting) to the main shaft 14 and the main shaft 14 is directly fixed to the rotor 16. In this case, over the length “L” of the rotor 16 in the rotation axis direction, the rotor 16 and the main shaft body 14 are fitted at the fitting portion “S” (the thick line portion). In all the drawings, the thickness “Sf” of the fitting portion indicates the size of the interference (fitting strength) of the fitting.
In FIG. 5C, a sleeve 20 (stepped sleeve or the like) is fitted between the rotor 16 and the main shaft body 14. Here, the diameter φ of each portion of the main shaft body 14 is φ1>φ2> φ3. The rotor 16 is fitted to the sleeve 20 at a fitting portion “Ss”, and the sleeve 20 is fitted to the main shaft body 14 at a fitting portion “S”. The through hole H is used for supplying hydraulic pressure or the like to the space K to remove the fitted main shaft body 14 from the sleeve 20.
[0003]
Since the above-described method of attaching the main shaft to the rotor has been generally performed conventionally, no prior art document will be described.
[0004]
[Problems to be solved by the invention]
When the main shaft 14 of the processing apparatus is attached to the rotor 16 of the motor 10, the fitting state of the fitting portion between the main shaft 14 and the rotor 16 may change due to the effects of centrifugal expansion, thermal stress, and the like. When the fitting state changes, the amount of bending of the main shaft body 14 changes depending on the difference in rotation speed and the manner in which a load is applied, which may affect machining accuracy. The “change in the amount of bending of the main shaft 14” means that the larger the area in which the main shaft 14 and the rotor 16 are fitted (the area in contact with each other due to the force of the fitting), the larger the area in the rotation axis direction of the main shaft 14. The longer the distance, the greater the effect. This is because not only a uniform stress is applied to each position but also various magnitudes of stress are applied to various positions in the fitting portion.
In the method of attaching the main shaft body 14 to the rotor 16 shown in FIG. 5B, the main shaft body 14 is fitted over the length "L" of the rotor 16 in the rotation axis direction. The distance in the rotation axis direction is long.
In the method of attaching the main shaft body 14 to the rotor 16 shown in FIG. 5C, the length of the fitting portion is “m1 + m2”, which is shorter than the length “L” of the rotor 16 in the rotation axis direction. Since the maximum distance “M” including the two fitting portions is long, the distance to which the stress is applied is long, and the effect of reducing the change in the amount of bending of the main shaft body 14 is small.
The present invention has been made in view of such a point, and reduces the amount of bending of the main shaft body by reducing the distance of the main shaft body in the rotation axis direction in the fitting portion, thereby achieving higher accuracy. An object of the present invention is to provide a method and an apparatus for attaching a spindle to a rotor that can rotate the spindle.
[0005]
[Means for Solving the Problems]
As a means for solving the above problems, a first invention of the present invention is a method of attaching a main shaft to a rotor as described in claim 1.
The method of attaching the main shaft to the rotor according to claim 1, wherein the main shaft is attached to the rotor of the motor by fitting the main shaft to the rotor, and the rotation of the fitting portion between the rotor and the main shaft is performed. Since the length in the axial direction is shorter than the length in the rotation axis direction of the rotor and the rotor is mounted by fitting, the distance of the main shaft body in the rotation axis direction at the fitting portion can be shortened.
Thereby, the amount of bending of the main shaft can be reduced, and the main shaft can be rotated with higher accuracy.
[0006]
According to a second aspect of the present invention, there is provided a method of attaching a main shaft to a rotor as described in claim 2.
The method of attaching the main shaft to the rotor according to claim 2 is the method of attaching the main shaft to the rotor according to claim 1, wherein the fitting of the rotor and the main shaft with respect to the length of the rotor in the rotation axis direction is performed. The fitting width ratio indicated by the length of the portion in the rotation axis direction is set within a predetermined range, and the main shaft is attached to the rotor of the motor with a tightening force according to the set fitting width ratio.
Thereby, the fitting can be appropriately performed with the fastening force according to the fitting width ratio, the amount of bending of the main shaft can be reduced, and the main shaft can be rotated with higher accuracy.
[0007]
A third aspect of the present invention is a method for attaching a main shaft to a rotor as described in claim 3.
The method of attaching a main shaft to a rotor according to claim 3 is a method of attaching the main shaft to the rotor via a substantially cylindrical sleeve between the rotor and the main shaft of the motor. A substantially annular convex portion is provided on the inner side of the sleeve or the outer side of the main shaft body in the circumferential direction with respect to the rotation axis, and the convex portion used for fitting the main shaft body and the sleeve is one place, and The length of the projection in the rotation axis direction is set shorter than the length of the rotor in the rotation axis direction. Then, the rotor and the sleeve are fitted together, and the sleeve and the main shaft body are fitted together at the projection.
As described above, the main shaft and the sleeve are fitted at one convex portion, and the length of the convex portion in the rotation axis direction is set to be shorter than the length of the rotor in the rotation axis direction. The distance of the fitting portion in the axial direction can be reduced.
Thereby, the amount of bending of the main shaft can be reduced, and the main shaft can be rotated with higher accuracy.
[0008]
Further, a fourth invention of the present invention is a method for attaching a main shaft to a rotor as described in claim 4.
The method of attaching the main shaft to the rotor according to claim 4 is a method of attaching the main shaft to the rotor via a substantially cylindrical sleeve between the rotor and the main shaft of the motor. On the inner side of the sleeve or the outer side of the main shaft, a plurality of substantially annular convex portions are provided in the circumferential direction with respect to the rotation axis, and there are a plurality of convex portions used for fitting the main shaft with the sleeve. In addition, the length of each projection in the rotation axis direction is set to be shorter than the length of the rotor in the rotation axis direction. Then, while the rotor and the sleeve are fitted together, the sleeve and the main shaft body are fitted with the plurality of protrusions, and the maximum distance in the rotation axis direction including the plurality of protrusions used for the fitting is the rotation axis direction of the rotor. A plurality of protrusions used for fitting are arranged so as to be shorter than the length.
In this manner, the main shaft body and the sleeve are fitted at a plurality of protrusions, and the length of each protrusion in the rotation axis direction is set to be shorter than the length of the rotor in the rotation axis direction, and a plurality of protrusions used for the fitting are set. By setting the maximum distance in the rotation axis direction including the projection to be shorter than the length of the rotor in the rotation axis direction, the distance of the fitting portion of the main shaft body in the rotation axis direction can be shortened.
Thereby, the amount of bending of the main shaft can be reduced, and the main shaft can be rotated with higher accuracy.
[0009]
A fifth aspect of the present invention is a processing apparatus as set forth in claim 5.
According to a fifth aspect of the present invention, the main shaft is attached to the rotor of the motor by the method of attaching the main shaft to the rotor according to any one of the first to fourth aspects.
This makes it possible to realize a processing device capable of reducing the amount of bending of the main shaft and rotating the main shaft with higher accuracy.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram illustrating one embodiment of a conventional “method of attaching a spindle to a rotor” and one embodiment of the present invention “a method of attaching a spindle to a rotor”.
◆ [First Embodiment (FIGS. 1 and 2)]
The first embodiment is a method of directly attaching the rotor 16 to the main shaft 14.
As shown in FIG. 1A, in the conventional “method of attaching the main shaft to the rotor”, for example, when shrink-fitting the rotor 16 to the main shaft 14, the interference of the fitting portion “ Sf "is likely to be non-uniform (the magnitude of the tightening force at each position is non-uniform), and the stress for tightening the main shaft body 14 (F1 to F6 in FIG. 1A) is likely to be biased. The factors include variations in the processing accuracy of each component and variations in the manner in which the rotor cools, and methods for holding the spindle 14 until the rotor 16 cools.
[0011]
The bias of the tightening stress causes the main shaft body 14 to bend. Here, the "bending of the main shaft 14" refers to the whirling of the main shaft 14 at the "evaluation position (see FIG. 1A)" for evaluating the performance of the main shaft 14. As shown in FIG. 1A, the rotation axis Zr and the main shaft body 14 actually bend with respect to the ideal rotation axis Zr (type) and the ideal main shaft body 14 (type). May be. In the case where "the bending of the main shaft 14" occurs, when the main shaft 14 is operated, the interference due to the difference in the amount of centrifugal expansion between the main shaft 14 and the rotor 16 is reduced (the tightening force is reduced), and the motor 10 The state of stress in the fitting portion is liable to change due to the occurrence of thermal stress due to the heat generated by the member. In this case, "the bending of the main shaft body 14" may further change. The change in the stress state largely depends on the width (distance in the rotation axis direction) of the fitting portion between the main shaft body 14 and the member (the rotor 16 in this case) fitted to the main shaft body 14. This is due to the magnitude of each stress (F1 to F6) and the moment due to the distance between the stresses.
[0012]
On the other hand, in the “method of attaching the main shaft to the rotor” in the present embodiment shown in FIG. 1B, the main shaft 14 and the member (the rotor 16 in this case) fitted to the main shaft 14 are connected. A convex portion is provided inside the rotor 16 so that the width (distance in the rotation axis direction) of the fitting portion becomes the distance “m”. As described above, the distance in the rotation axis direction at the fitting portion is set to a distance sufficiently shorter than the distance "L" according to the conventional method shown in FIG. Thus, it is possible to suppress a change in the stress state due to a moment or the like due to the magnitude of each stress (F1 to F4) and the distance between the stresses. In this case, since the distance of the fitting portion in the rotation axis direction is shortened, the interference "Sf" (tightening force) of the fitting portion is increased.
In the present embodiment, a convex portion (a convex portion directed inward) in the circumferential direction with respect to the rotation axis Zr is provided inside the rotor 16, but a convex portion in the circumferential direction with respect to the rotation axis Zr is provided outside the main shaft body 14. A portion (a convex portion facing outward) may be provided. Further, the convex portion may be provided at a plurality of places instead of one place. When the protrusions are provided at a plurality of positions, the fitting is performed such that the maximum distance in the rotation axis direction including the protrusions and the protrusions used for fitting is smaller than the distance “L” of the rotor 16 in the rotation axis direction. The convex part to be used is arranged.
[0013]
Next, a method for setting the distance in the rotation axis direction of the fitting portion and a method for setting the interference will be described with reference to the graphs shown in FIGS.
The fitting width ratio / fitting interference ratio characteristics shown in FIG. 2 (A) correspond to “fitting width” and “fitting interference” in the conventional mounting method shown in FIG. The graph when 0 is set is shown. According to this characteristic, when the fitting width ratio is 0.4 (0.4 times the conventional width), the interference ratio needs to be about 2.5 (2.5 times the conventional tightening force). It indicates that there is. The “limit of the interference” indicates a physical limit (a limit due to a size in expansion when shrink-fitting, a diameter of the main shaft body 14 and the like). Although the "limit of the interference" is affected by the material, dimensions, shape, allowable torque, and the like, the interference ratio can be set in a range of 0 to 5 in the embodiment.
[0014]
The fitting width ratio / shaft bending change ratio characteristics shown in FIG. 2 (B) are the “fitting width” and “shaft bending change amount” in the conventional mounting method shown in FIG. The graph when 0 is set is shown. According to this characteristic, when the fitting width ratio is 0.4 (0.4 times the conventional width), the axial bending change ratio can be reduced to about 0.2 (1/5 the conventional bending amount). ing.
For example, when it is desired to reduce the shaft bending change ratio to 1/5 (0.2 times) of the related art, the fitting width ratio is set to be smaller than the “fit width ratio / shaft bending change ratio characteristic” shown in FIG. It can be seen that it is sufficient to set the fitting interference ratio to 2.5, by setting it to 0.4 and from the “fitting width ratio / fitting interference ratio characteristic” shown in FIG.
As described above, if the method of attaching the main shaft to the rotor in the present embodiment is used, the amount of bending of the main shaft can be reduced as compared with the conventional case, and the processing accuracy can be further improved. Conventionally, the bending of the main shaft at the time of shrink fitting may be corrected by re-grinding the main shaft after shrink fitting. However, in the present embodiment, the main shaft at the time of shrink fitting is corrected. In order to reduce the amount of bending itself, there is almost no need to regrind the spindle.
[0015]
Note that if the fitting width ratio is reduced, the axial bending change ratio can be reduced, but the fitting width ratio cannot be made smaller than the "limit of interference" shown in FIG. In the case of the example shown in FIG. 2A, the fitting width ratio can be set in the range of 0.2 to 1.0.
In this case, the fitting width ratio is set within a predetermined range so that the shaft bending change amount ratio is smaller and the limit of the interference is not exceeded, and the fitting interference ratio according to the set engagement width ratio is set. Attach.
In the case of the examples shown in FIGS. 2A and 2B, in order to further reduce the axial bending change ratio, the fitting width ratio is not exceeded without exceeding the limit of the interference, and considering variations such as errors. Is preferably set to about 0.3 to 0.4.
[0016]
◆ [Second embodiment (FIGS. 3A and 4A)]
In the first embodiment, the method of directly shrink-fitting the rotor 16 to the main shaft 14 has been described. However, in the second to fifth embodiments described below, the main body 14 and the rotor 16 A method for attaching the main shaft body 14 to the rotor 16 via a substantially cylindrical sleeve 20 therebetween will be described.
FIG. 3A is a schematic view showing a method of attaching the main shaft body 14 to the rotor 16 in the second embodiment. A substantially cylindrical sleeve 20 was inserted into the rotor 16, and the rotor 16 and the sleeve 20 were fitted together at the fitting portion “Ss”, and the main shaft 14 was inserted into the sleeve 20 to be provided inside the sleeve. The sleeve 20 and the main shaft body 14 are fitted at the fitting portion “S” at the convex portion. Note that a protrusion may be provided outside the main shaft body 14 without providing the protrusion inside the sleeve 20.
When the distance in the rotation axis direction of the rotor 16 is “L” and the distance in the rotation axis direction of the fitting portion of the main shaft body 14 is “m”, the fitting interference in the fitting width ratio (m / L). The ratio and the ratio of the amount of change in the axial bending show characteristics similar to those described in FIGS. 2A and 2B.
[0017]
In the second embodiment shown in FIG. 3A, the overhang portion V may become an unbalance or twisting factor depending on the size of the rotor 16 and the magnitude of the torque. Can cause Therefore, by supporting the overhang portion V with, for example, an O-ring or fitting of a relatively weak clamping force, it is possible to reduce vibration and the like during rotation. An example using this structure is shown in FIG.
Note that the “fit of relatively weak force” is different from the “fit (fixedly fixed fit)” described so far, and hence, the “relatively weak force” that can be supported "Fit" is referred to as "support level fit".
[0018]
In the example of FIG. 4A, the diameter φ of the main shaft body 14 is φ1> φ2. As shown in FIG. 4A, the overhang portion V is supported by an O-ring G (the main shaft body 14 and the sleeve 20 are brought into contact with the O-ring G). As shown in FIG. 4A, when a stepped sleeve is used for the sleeve 20, even after the sleeve 20 is attached to the main shaft body 14, the hydraulic pressure is supplied from the through hole H so that the space can be reduced. By expanding K, it is possible to withdraw the sleeve 20 from the main shaft body 14 (in this case, withdraw rightward). This makes it easier to repair the fitted state and to replace the spindle 14 or the motor 10. In this case, the O-ring G on the side of the through hole H needs to be hermetically sealed.
[0019]
◆ [Third Embodiment (FIGS. 3B and 4B)]
FIG. 3B is a schematic view showing a method of attaching the main shaft body 14 to the rotor 16 in the third embodiment. A substantially cylindrical sleeve 20 was inserted into the rotor 16, and the rotor 16 and the sleeve 20 were fitted together at the fitting portion “Ss”, and the main shaft 14 was inserted into the sleeve 20 to be provided inside the sleeve. The sleeve 20 and the main shaft body 14 are fitted at the fitting portion “S” at the convex portion. Note that a protrusion may be provided outside the main shaft body 14 without providing the protrusion inside the sleeve 20.
When the distance in the rotation axis direction of the rotor 16 is “L” and the distance in the rotation axis direction of the fitting portion of the main shaft body 14 is “m”, the fitting interference in the fitting width ratio (m / L). The ratio and the ratio of the amount of change in the axial bending show characteristics similar to those described in FIGS. 2A and 2B. Hereinafter, the same applies to the fourth and fifth embodiments.
[0020]
As in the second embodiment, in the third embodiment shown in FIG. 3 (B), depending on the size of the rotor 16 and the magnitude of the torque, the overhang portion V may cause unbalance or torsion. And may cause vibration or the like during rotation. Therefore, as in the second embodiment, by supporting the overhang portion V with an O-ring or by fitting a support level, vibration during rotation can be reduced. An example using this structure is shown in FIG.
In the example of FIG. 4B, the diameter φ of the main shaft body 14 is φ1> φ2. As shown in FIG. 4B, the overhang portion V is supported by an O-ring G (the main shaft 14 and the sleeve 20 are brought into contact with the O-ring G). As shown in FIG. 4B, when a stepped sleeve is used for the sleeve 20, even after the sleeve 20 is attached to the main shaft 14, by supplying hydraulic pressure from the through hole H, the space can be increased. By expanding K, it is possible to withdraw the sleeve 20 from the main shaft body 14 (in this case, withdraw rightward). This makes it easier to repair the fitted state and to replace the spindle 14 or the motor 10. In this case, the O-ring G on the side of the through hole H needs to be hermetically sealed.
[0021]
◆ [Fourth embodiment (FIG. 4C)]
In the fourth embodiment shown in FIG. 4C, the fitting portion between the main shaft 14 and the sleeve 20 is modified from the third embodiment shown in FIG. 4B. Hereinafter, differences from the third embodiment will be described.
The diameter φ of the main shaft body 14 is φ1>φ2> φ3. The rotor 16 and the sleeve 20 are fitted at a fitting portion “Ss”, and the sleeve 20 and the main shaft body 14 are fitted at two convex portions (a plurality of convex portions) provided inside the sleeve 20. S ”. Note that a protrusion may be provided outside the main shaft body 14 without providing the protrusion inside the sleeve 20.
Further, assuming that the distances in the rotation axis direction at the fitting portion of the main shaft body 14 are “m1” and “m2”, respectively, the fitting width ratio (m / L) used for the fitting width ratio / fitting interference ratio characteristic. ) Is replaced by m = m1 + m2 (the sum of the fitting widths of the respective protrusions; see FIG. 4C). In addition, “m” of the fitting width ratio (m / L) used for the fitting width ratio / shaft bending change ratio characteristic is m = mt (the maximum distance in the rotation axis direction including each convex portion. 4 (C)).
Further, the through hole H for supplying hydraulic pressure is provided so as to communicate with a space K between the convex portions used for fitting. For this reason, the O-ring G in the fourth embodiment does not need to have airtightness.
[0022]
◆ [Fifth Embodiment (FIG. 4D)]
The fifth embodiment shown in FIG. 4 (D) is different from the fourth embodiment shown in FIG. 4 (C) in that a fitting portion "Sa" is used instead of the O-ring G by fitting a support level. It was what was. Hereinafter, differences from the fourth embodiment will be described.
The diameter φ of the main shaft 14 is φ1>φ2>φ3>φ4> φ5. The rotor 16 and the sleeve 20 are fitted together at the fitting portion “Ss”, and the sleeve 20 is provided on the inside of the sleeve 20 by two convex portions (a plurality of convex portions) used for the fitting portion “S”. The main shaft 14 is fitted. Then, the sleeve 20 is supported on the main shaft body 14 by two convex portions used for the support level fitting portion “Sa” provided inside the sleeve 20. Note that a protrusion may be provided outside the main shaft body 14 without providing the protrusion inside the sleeve 20.
In addition, the through holes H and H1 when supplying hydraulic pressure are formed by a space K between the convex portions used for fitting and a space between the convex portions used for fitting the support level. K1 is provided so as to communicate with each of them.
[0023]
The above-described “method of attaching the spindle to the rotor” is not limited to application to a processing device, but can be applied to various devices having a rotating spindle. In particular, if the present invention is applied to a processing device that performs cutting or the like using a rotating main shaft, the main shaft can be rotated with higher accuracy, and a processing device that processes a work with higher accuracy can be realized. is there.
Further, a "main shaft body mounting structure to the rotor" may be used, in which the main shaft body is mounted on the rotor using the structure described above.
[0024]
The method of attaching the spindle to the rotor and the processing apparatus of the present invention are not limited to the configuration, shape, and the like described in the present embodiment, and various changes, additions, and deletions are possible without changing the gist of the present invention. is there. For example, three projections for fitting may be provided.
The method of attaching the main shaft to the rotor according to the present invention can be used for various devices that require high-precision rotation of the main shaft. For example, the present invention can also be applied to a main spindle that rotates at tens of thousands [rpm].
The numerical values and graphs used in the description of the present embodiment are examples, and the present invention is not limited to these numerical values and graphs.
The material of the main shaft body may be, for example, a steel material such as SCM415 (carburized steel), SACM645 (nitrided steel), or an Al ₂ O ₃ , SiC, or SiTi ceramic. Further, as a material of the sleeve, for example, there is a steel material such as SCM415 (carburized steel).
[0025]
【The invention's effect】
As described above, by using the method of attaching the main shaft to the rotor according to any one of claims 1 to 4, the distance of the main shaft in the rotation axis direction of the fitting portion in the fitting portion is reduced, so that the main shaft is The amount of bending can be reduced, and the spindle can be rotated with higher accuracy.
Further, according to the processing device described in claim 5, it is possible to realize a processing device capable of rotating the spindle body with higher accuracy.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a conventional method of attaching a spindle to a rotor and a method of attaching a spindle to a rotor (first embodiment) of the present invention.
FIG. 2 is a diagram illustrating a graph of a fitting width ratio / fitting interference ratio characteristic, and a graph of a fitting width ratio / axial bending change ratio characteristic.
FIG. 3 is a diagram illustrating a second and a third embodiment.
FIG. 4 is a diagram illustrating second to fifth embodiments.
FIG. 5 is a diagram illustrating a conventional method of attaching a main shaft to a rotor.
[Explanation of symbols]
Reference Signs List 10 Motor 14 Main shaft 16 Rotor 20 Sleeve S Fitting portion Ss (of main shaft) Ss Fitting portion between rotor and sleeve Sf Fitting portion interference L Distance in the rotating shaft direction of the rotor m Fitting portion of main shaft Distance (width) in rotation axis direction
Zr rotation axis F1-F6 stress

Claims (5)

A method of attaching a main shaft to a rotor of a motor by fitting the main shaft to a rotor,
The length of the fitting portion between the rotor and the main shaft body in the rotation axis direction is shorter than the length of the rotor in the rotation axis direction,
A method of attaching a spindle to a rotor. A method of attaching a main shaft to a rotor according to claim 1,
With respect to the length of the rotor in the rotation axis direction, a fitting width ratio indicated by the length in the rotation axis direction of a fitting portion between the rotor and the main shaft body is set within a predetermined range, and the fitting width ratio is set according to the set fitting width ratio. Attach the main shaft to the motor rotor with the tightening force,
A method of attaching a spindle to a rotor. A method of attaching the main shaft to the rotor via a substantially cylindrical sleeve between the rotor of the motor and the main shaft, a method of attaching the main shaft to the rotor,
A substantially annular convex portion is provided inside the sleeve or outside the main shaft body in the circumferential direction with respect to the rotation axis,
The number of protrusions used for fitting the main shaft body and the sleeve is one, and the length of the protrusion in the rotation axis direction is set shorter than the length of the rotor in the rotation axis direction,
Along with fitting the rotor and the sleeve, the sleeve and the main shaft body are fitted with the projection.
A method of attaching a spindle to a rotor. A method of attaching the main shaft to the rotor via a substantially cylindrical sleeve between the rotor of the motor and the main shaft, a method of attaching the main shaft to the rotor,
A plurality of substantially annular convex portions are provided inside the sleeve or outside the main shaft body in the circumferential direction with respect to the rotation axis,
There are a plurality of protrusions used for fitting the main shaft body and the sleeve, and the length of each protrusion in the rotation axis direction is set shorter than the length of the rotor in the rotation axis direction,
The rotor and the sleeve are fitted together, and the sleeve and the main shaft body are fitted with the plurality of protrusions, and the maximum distance in the rotation axis direction including the plurality of protrusions used for fitting is larger than the length of the rotor in the rotation shaft direction. Arrange a plurality of protrusions used for fitting so that
A method of attaching a spindle to a rotor. A machining device comprising a motor and a spindle, wherein the spindle is rotated by the motor to perform machining,
A method of attaching a main shaft to a rotor of a motor according to the method of attaching a main shaft to a rotor according to any one of claims 1 to 4,
A processing device characterized by the above-mentioned.

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