JP2005342861A - Vibration suppressing tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration suppressing tool for suppressing vibration contributing to reduction of generation of noise, improvement of machining accuracy and the service life of a cutting tool, shortening of machining time and improvement of productivity of a machined product by suppressing vibration generated by rotation of a rotary shaft by mounting the tool on a machine tool. <P>SOLUTION: This suppressing tool 1 has a bearing part which is a bearing mounted on a machine tool main body in an inserted state of the rotary shaft or a collar C and has an inner diameter capable of inserting the rotary shaft or the collar C, and has an adjuster provided with a roller at a distal end. The adjuster is arranged so that the distal end may be in contact with the rotary shaft. The tool 1 is constituted of a plurality of collars C fitted to the rotary shaft. Reverse truncated cone shaped tapered receiving recessed parts are provided at both ends of the one collar C. In the collars C fitted on both the sides, truncated cone shaped tapered projecting parts having almost the same shapes as those of the tapered receiving recessed parts are provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vibration reducing tool that is mounted on a machine tool that performs cutting by rotating a rotating shaft, and that reduces vibrations generated by the rotation of the rotating shaft.

  Conventionally, in a machine tool, a workpiece is cut by rotating a rotating shaft. Such machine tools include lathes, boring machines, milling machines, drilling machines, polishing machines, and the like. In such machining by a machine tool, vibration is generated by the rotation of the rotating shaft. There are various possible causes of vibration, but vibration occurs due to rattling caused by friction over many years at the base of the rotating shaft in machine tools, or vibration due to centrifugal force due to the size or weight of the cutting tool to be attached. May occur.

  At this time, there was a problem that a tremendous noise was generated by the vibration at the same time as the machine tool was driven. In addition, the vibration is transmitted to the cutting tool attached to the rotating shaft, and the machining accuracy of the workpiece is lowered. Furthermore, the life of the cutting tool itself is shortened by using the cutting tool while the vibration is applied. There was also a problem such as.

Various techniques have been proposed and various attempts have been made so far to solve the above problems, but at present, such problems have not been solved, and therefore the above problems are not solved. Still remains.
JP2004-106091 JP 2002-172504 A

  In view of the above problems, the present invention reduces the generation of noise by reducing the vibration generated by the rotation of the rotary shaft by mounting a vibration reducing tool for reducing vibration on a machine tool, An object of the present invention is to provide a vibration attenuator that improves the tool life and further contributes to shortening the machining time and improving the productivity of the workpiece.

  In order to achieve the above object, the present invention is a vibration reducing tool mounted on a machine tool for cutting a workpiece by rotating a rotating shaft and having a function of reducing vibration generated by the rotation of the rotating shaft. is there.

  In the present invention, the vibration attenuator is a bearing that is attached to the machine tool body in a state in which the rotating shaft is inserted, and has a bearing portion having an inner diameter into which the rotating shaft can be inserted and a roller at the tip. It is possible to adopt a configuration in which the tip of the adjuster is arranged so that the tip of the adjuster contacts the rotating shaft.

  Furthermore, the present invention can employ a configuration in which the bearing portion of the vibration reducing tool has an inner diameter into which a collar fitted to the rotating shaft can be inserted.

  Furthermore, the present invention comprises a plurality of collars on which the vibration attenuating tool is fitted to a rotating shaft, and a tapered receiving recess having an inverted frustoconical shape is provided at both ends of one collar and is fitted on both sides thereof. The collar may be configured to have a truncated cone-shaped tapered convex portion that is substantially the same shape as the tapered receiving concave portion.

  According to the vibration reducing tool of the present invention, the vibration generated by the rotation of the rotating shaft in the machine tool can be surely reduced, and the tremendous noise from the vibration can be reduced, which is very useful.

  In addition, in cutting using a machine tool, the vibration transmitted to the cutting tool is also reduced by reducing the vibration of the rotating shaft, dramatically improving machining accuracy and dramatically improving the cutting tool life. In addition, the machining time can be drastically improved and the machining time can be shortened, thereby contributing to the improvement of the productivity of the processed product.

  Hereinafter, embodiments of a vibration reducing tool 1 according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an embodiment of the first vibration reducing tool 1 according to the present invention. The vibration reducing tool 1 is mounted on a machine tool that cuts the workpiece K by rotating the rotating shaft S, and functions as a bearing 2 of the rotating shaft S. That is, the vibration reducing tool 1 according to the present invention includes a bearing portion 3 having an inner diameter into which the rotation shaft S can be inserted, and is mounted on the machine tool body, and the rotation shaft S is inserted into the bearing portion 3. It is the composition which becomes.

  The vibration reducing tool 1 has an adjuster 5 having a roller 6 at the tip, and the tip is arranged so as to be in contact with the rotating shaft S inserted into the bearing portion 3. The attachment means and attachment location of the adjuster 5 to the bearing 2 are not particularly limited, but in FIGS. 1 to 3, a through hole 4 is provided from the side surface of the bearing 2 toward the bearing portion 3, and the penetration The case where the structure attached by inserting the adjuster 5 in the hole 4 is employ | adopted is shown. In this case, the adjuster 5 is inserted to such an extent that the tip of the adjuster 5 protrudes slightly from the inner surface of the bearing portion 3, and the tip contacts the rotating shaft S inserted into the bearing portion 3. An adjuster 7 is provided at the base of the adjuster 5 so that the position of the adjuster 5 can be adjusted. That is, by providing the adjustment tool 7, it is possible to adjust the positioning of how much the tip of the adjuster 5 protrudes from the inner surface of the bearing portion 3. FIG. 2 is a partial cross-sectional view according to one embodiment of the first vibration reducing tool 1 of the present invention for showing the insertion state of the adjuster 5, and FIG. 3 shows the rotation shaft S and the tip of the adjuster 5. It is a cross-sectional enlarged view concerning one Embodiment in the 1st vibration reduction tool 1 of this invention for showing a contact state with.

  It is also conceivable to adopt a configuration in which the adjuster 5 is mounted on the outside of the bearing 2 with respect to the mounting means and mounting location. FIG. 4 shows a case where the adjuster 5 is mounted outside the bearing 2. In this case as well, as described above, the adjuster 5 is mounted so that the tip of the adjuster 5 protrudes slightly from the inside of the bearing portion 3, and the tip contacts the rotating shaft S inserted in the bearing portion 3. An adjuster 7 is provided at the base of the adjuster 5 so that the position of the adjuster 5 can be adjusted. That is, by providing the adjustment tool 7, it is possible to adjust the positioning of how much the tip of the adjuster 5 protrudes from the inside of the bearing portion 3.

  Here, the cause of the vibration generated in the machine tool will be described. Such a cause may be vibration due to rattling caused by friction over many years at the base of the rotary shaft S in a machine tool, or vibration due to centrifugal force due to the size, weight, etc. of the cutting tool T to be mounted. Etc. That is, since there is a deviation between the center line L where the rotation axis S should originally rotate and the center point where the rotation axis S is actually located, the center point of the rotation axis S is at the tip of the rotation axis S. A circular motion is caused about the center line L to generate vibration. Accordingly, it is necessary to match the center line L to be rotated with the center point of the rotation axis S in order to reduce such vibration.

  Further, even when the center line L to be rotated and the center point of the rotation axis S can be made coincident, when cutting is actually performed, the pressure at which the cutting tool T and the workpiece K are in contact with each other. As a result, the center line L to be rotated and the center point of the rotation axis S are shifted again, so that it is necessary not to cause a shift due to the pressure.

  By adopting the above configuration, the first vibration reducing tool 1 according to the present invention can match the center line L to be rotated and the center point of the rotation axis S as much as possible. That is, since the adjuster 7 can be used to adjust the position of the adjuster 5, the position of the adjuster 5 can be adjusted, and the shift of the center point of the rotation axis S can be corrected to coincide with the center line L to be rotated. It becomes possible. If the center line L to be rotated and the center point of the rotation axis S completely coincide with each other, vibrations of the machine tool hardly occur, and the center line L to be rotated and the center point of the rotation axis S completely Even if they cannot be matched, the vibration of the machine tool is reduced to the limit due to the action of pressing the rotating shaft S with the adjuster 5.

  Further, if the rotary shaft S is completely positioned by the adjuster 5, even if pressure is applied from the outside, the rotary shaft S does not deviate from the position. Therefore, in the actual cutting process, the cutting tool T and the workpiece K are separated. There is no deviation at the center point of the rotary shaft S that has already been positioned due to the pressure at the time of contact, and this has a great effect on reducing the vibration.

  In addition, since the roller 6 is provided at the tip of the adjuster 5, friction between the inner surface of the bearing portion 3 and the outer peripheral surface of the rotating shaft S caused by the rotation of the rotating shaft S is reduced. That is, the wear of the inner surface of the bearing portion 3 and the outer peripheral surface of the rotating shaft S is reduced, and the function as the original bearing 2 is sufficiently exerted, and it works beneficially for preventing the displacement of the rotating shaft S. Furthermore, the rotation of the rotary shaft S is smoothly performed by the action of the roller 6, and the effect of further reducing vibration is exhibited.

  Although the number of adjusters 5 arranged is not particularly limited, at least two functions are required for adjusting the position of the center point of the rotating shaft S and reducing friction between the inner surface of the bearing portion 3 and the outer peripheral surface of the rotating shaft S. It is desirable to arrange more than four places, preferably four or more places.

  Further, the means for attaching the first vibration reducing tool 1 according to the present invention to the machine tool is not particularly limited, and a step of providing a structure that can be attached to an existing machine tool or newly manufacturing a machine tool. It is also conceivable to construct a machine incorporating the vibration reducing tool 1.

  5 and 6 are explanatory views showing an embodiment in a state where the first vibration reducing tool 1 according to the present invention is actually mounted on a machine tool, and FIG. Shows a case where the horizontal milling machine F is mounted. In a state in which the vibration reducing tool 1 is mounted on the machine tool, the adjusting tool 7 is adjusted so that the center line L to be originally rotated and the center point of the rotating shaft S coincide with each other, and cutting is performed. In the drawings, a drilling machine B and a horizontal milling machine F are illustrated as machine tools. However, other machine tools such as a lathe, a vertical milling machine, a polishing machine, a boring machine, etc., are rotated to rotate the rotating shaft S. Any machine tool that cuts can be used.

  Further, as shown in FIG. 6, a machine tool in which a collar C is fitted to a rotary shaft S such as a horizontal milling machine rotates the collar C together with the rotary shaft S. Therefore, the present invention is applied to such a machine tool. When the vibration attenuating tool 1 is mounted, the bearing portion 3 of the vibration attenuating tool 1 is configured to have an inner diameter into which the collar C can be inserted. Other configurations are the same as the above configuration in which the rotation shaft S is inserted into the bearing portion 3.

  FIG. 7 is a perspective view showing a second vibration reducing tool 1 according to the present invention, and FIG. 8 is a partial sectional view showing the second vibration reducing tool 1 according to the present invention. The vibration attenuating tool 1 is composed of a plurality of collars C having a function of a collar C fitted to a rotary shaft S such as a horizontal milling machine. At both ends of one collar C, an inverted frustoconical tapered receiving recess 8 is provided, which functions as a tapered receiving C1. The collar C fitted on both sides of the taper receiver C1 is provided with a truncated cone-shaped tapered convex portion 9 having substantially the same shape as the taper receiving concave portion 8, and functions as the taper C2. For the other collars C and cutting tools T that are fitted to the rotary shaft S, ordinary ones are used.

  Each collar C and cutting tool T has a rotation shaft insertion hole 10 in the center, and each collar C and cutting tool T is fitted to the rotation shaft S through the rotation shaft insertion hole 10, and the rotation shaft S Each of the collars C and the cutting tool T is rotated along with the rotation of the material, and cutting is performed. The conventional collar C has a simple cylindrical shape, and the cutting tool T is sandwiched between one color C and another color C, and cutting has been performed. In such processing, in order to prevent the cutting tool T from blurring, the fitted collar C has to be tightened at the end of the rotation shaft S. However, complete tightening is impossible and a fine gap is generated, and when the rotation of the rotary shaft S is added, the gap becomes remarkable. Even if the rotation can be completely tightened at the tightening stage, if the rotation of the rotary shaft S is applied thereto, a gap is generated due to the stress caused by the rotation, or the fastening means at the end of the rotary shaft S can be loosened. It will cause a gap. As a result, the cutting tool T is shaken, the machining accuracy is lowered, and the machine tool is also vibrated.

  According to the second vibration reducing tool 1 of the present invention, the tapered receiving recess 8 having the inverted truncated cone shape is provided at both ends of the collar C so as to function as the tapered receiving C1, and both sides of the tapered receiving C1 are provided. The above-mentioned problem is solved by providing a truncated cone-shaped tapered convex portion 9 that is substantially the same shape as the tapered receiving concave portion 8 for the collar C fitted to the collar C so as to function as the tapered C2. That is, when the collar C and the cutting tool T are fitted to the rotation shaft S and the end of the rotation shaft S is tightened, the taper receiving recess 8 and the taper projection 9 are fitted, and each time the tightening is performed, the taper projection The portion 9 is dressed into the taper receiving recess 8. When the tightening is stopped, the tapered convex portion 9 that has bitten into the tapered receiving concave portion 8 tries to come out from the tapered receiving concave portion 8 this time. As shown in FIG. 9, the function acts on the force that the collar C tries to expand in the axial direction, so that the gaps between the collars C and the cutting tool T are brought into close contact with each other. Therefore, the cutting tool T is sandwiched between the collars C without any gap, and no blur occurs even when the rotation shaft S rotates.

  In addition, it is desirable to form one or more grooves 9a in the taper C2. By forming the groove 9a, the expansion and contraction of the taper C2 is improved, and the taper-shaped convex portion 9 is easy to bite into the taper-receiving concave portion 8 during tightening, and the taper-shaped convex portion 9 is tapered after the tightening. It will be possible to further function to try to get out of 8

  FIG. 9 is a perspective view showing an embodiment in a state in which the first vibration attenuating tool 1 and the second vibration attenuating tool 1 according to the present invention are mounted on the horizontal milling machine F. FIG. By mounting both the first vibration reducing tool 1 and the second vibration reducing tool 1, the synergistic effect of their action reduces vibration, reduces noise, improves machining accuracy, and improves the life of the cutting tool T. Thus, the effects of shortening the processing time and improving the productivity are drastically achieved.

  The first vibration reducing tool 1 according to the present invention is not limited to a machine tool that performs cutting by rotating the rotating shaft S as described above due to the property of reducing the vibration of the rotating rotating shaft S. The present invention can be applied to the field of machines that require precision to reduce the vibration caused by the rotation of the shaft S, particularly machines that require bearings.

It is a perspective view which shows one Embodiment in the 1st vibration reduction tool concerning this invention. It is a fragmentary sectional view concerning one embodiment in the 1st vibration reducing tool of the present invention. It is an expanded sectional view concerning one embodiment in the 1st vibration reducing tool of the present invention. It is a perspective view which shows other embodiment in the 1st vibration reduction tool concerning this invention. It is a perspective view which shows the Example of the state which mounted | wore the drilling machine with the 1st vibration reduction tool concerning this invention. It is a perspective view which shows the Example of the state which mounted | wore the horizontal milling machine with the 1st vibration reduction tool concerning this invention. It is a perspective view which shows the 2nd vibration reduction tool concerning this invention. It is a fragmentary sectional view showing the 2nd vibration reducing tool concerning the present invention. It is a perspective view which shows the Example of the state which mounted | wore the horizontal milling machine with the 1st vibration reduction tool and 2nd vibration reduction tool concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vibration reduction tool 2 Bearing 3 Bearing part 4 Through-hole 5 Adjuster 6 Roller 7 Adjustment tool 8 Taper receiving recessed part 9 Taper-shaped convex part 10 Rotating shaft insertion hole B Drilling machine C Color C1 Taper receiving C2 Taper F Horizontal milling machine K Workpiece L Center Line S Rotating axis T Cutting tool

Claims (4)

  A vibration reducing tool that is mounted on a machine tool that cuts a workpiece by rotating a rotating shaft and has a function of reducing vibration generated by the rotation of the rotating shaft.   The vibration attenuator is a bearing attached to the machine tool body with the rotating shaft inserted, and has an inner diameter bearing portion into which the rotating shaft can be inserted and an adjuster having a roller at the tip. The vibration attenuator according to claim 1, wherein the adjuster is disposed so that a tip of the adjuster is in contact with the rotating shaft.   The vibration attenuator according to claim 2, wherein the bearing portion of the vibration attenuator has an inner diameter into which a collar fitted to the rotating shaft can be inserted. The vibration attenuator comprises a plurality of collars fitted to the rotating shaft, and one collar has opposite frustoconical tapered receiving recesses at both ends, and the collars fitted on both sides thereof are provided with the tapered receptacles. 2. The vibration reducing tool according to claim 1, wherein a tapered convex portion having a truncated cone shape having substantially the same shape as the concave portion is provided.

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