JP5350957B2 - Anti-vibration tool and turning method for thin-walled cylindrical workpiece into which anti-vibration tool is inserted - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control tool which increases a backup force generated against an inner peripheral face of a thin wall cylindrical workpiece, and prevents the vibration control tools overlapping one another, and also to provide a lath cutting method for a thin wall cylindrical workpiece in which the vibration control tools is inserted. <P>SOLUTION: When lath cutting an outer peripheral face of the thin wall cylindrical workpiece rotatably supported, the vibration control tool 1 extending in an axial direction of the thin wall cylindrical workpiece is inserted in the thin wall cylindrical workpiece. The vibration control tool 1 is pressed against the inner peripheral face of the thin wall cylindrical workpiece as the thin wall cylindrical workpiece is rotated, so that chattering vibration of the thin wall cylindrical workpiece in suppressed. A traverse section of the each vibration control tool 1 is formed in an oval shape. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  In the present invention, when turning the outer peripheral surface of the thin cylindrical workpiece rotatably supported, the thin cylindrical workpiece is pressed against the inner peripheral surface of the thin cylindrical workpiece as the thin cylindrical workpiece is rotated. The present invention relates to a vibration isolator that suppresses chatter vibration. The present invention also relates to a turning method for a thin cylindrical workpiece that suppresses chatter vibration of the thin cylindrical workpiece using the vibration isolator when the outer peripheral surface of the thin cylindrical workpiece is turned.

  In the patent document 1, the present applicant has disclosed a turning method for suppressing the occurrence of chatter vibration when an outer surface turning process is performed on a thin-walled pipe-shaped workpiece having reduced diameter portions at both ends. In this turning method, a plurality of round rod-shaped vibration isolator having an outer diameter smaller than the inner diameter of the reduced diameter portion is inserted into a thin pipe-shaped workpiece.

  Thereafter, when the thin pipe-shaped workpiece is rotated during the above-described outer surface turning process, all the vibration isolators are continuously arranged along the inner circumferential surface of the thin-walled pipe workpiece by centrifugal force. Pressed against the surface. As a result, a backup force is generated on the inner peripheral surface, and chatter vibration is suppressed by the backup force.

JP 2001-87902 A

  However, when a thin cylindrical workpiece is used when turning a thin cylindrical workpiece as in the above-described turning method, a part of the outer peripheral surface of the anti-vibration device is not included in the thin cylindrical workpiece. It was only pressed against the surface. For this reason, there is a concern that the round-bar-shaped vibration isolator may not be able to generate a sufficient backup force on the inner peripheral surface and cannot effectively suppress the occurrence of chatter vibration.

  Further, in addition to a round bar-shaped vibration isolator, for example, when a vibration isolator made of a band-shaped member is inserted into a thin cylindrical workpiece, when the thin cylindrical workpiece is rotated during turning, the vibration isolator There is also a concern that the two do not overlap and cannot be pressed against the inner peripheral surface of the thin cylindrical workpiece.

  This invention is proposed in view of such a situation, and while being able to increase the backup force generated with respect to the inner peripheral surface of the thin cylindrical workpiece, the vibration isolator capable of suppressing overlapping with each other, It aims at providing the turning method of the thin cylindrical workpiece | work in which this vibration isolator is inserted.

  The vibration isolator according to the invention of claim 1 is inserted into the thin cylindrical workpiece and extends in the axial direction of the thin cylindrical workpiece when turning the outer peripheral surface of the thin cylindrical workpiece rotatably supported. A vibration isolator that is pressed against the inner peripheral surface of the thin cylindrical workpiece as the thin cylindrical workpiece is rotated to suppress chatter vibration of the thin cylindrical workpiece, and has a cross-sectional shape of the vibration isolator Is characterized by an elliptical shape.

  The invention of claim 2 is characterized in that, in claim 1, the vibration isolator is made of a cylindrical elastic body, and a holding member for holding the elliptical shape is inserted into the cylindrical elastic body. And

  According to a third aspect of the present invention, in the second aspect, the holding member is an elastic body.

  According to a fourth aspect of the present invention, in the second or third aspect, the cylindrical elastic body is formed by an elliptical laminated body in which thin and strip-like elastic materials are wound in an elliptical shape and laminated.

  The invention according to claim 5 inserts a vibration isolator extending in the axial direction of the thin cylindrical workpiece into the thin cylindrical workpiece rotatably supported, and rotates the thin cylindrical workpiece so that the outer peripheral surface of the thin cylindrical workpiece is In the turning method of a thin cylindrical workpiece to be turned, the vibration isolator according to any one of claims 1 to 4 is inserted into the thin cylindrical workpiece.

According to the vibration isolator according to the invention of claim 1 and the thin cylindrical workpiece turning method according to the invention of claim 5, a part of the outer periphery of the conventional round rod-shaped vibration isolator is pressed against the inner peripheral surface. Compared to the case where the outer peripheral surface of the thin cylindrical workpiece is turned, the region where the vibration isolator of the present invention is pressed against the inner peripheral surface can be widened. Accordingly, when turning the outer peripheral surface of the thin cylindrical workpiece, the backup force for the inner peripheral surface of the thin cylindrical workpiece can be increased as compared with the conventional case.
Further, when turning the outer peripheral surface of the thin cylindrical workpiece, even if another vibration isolator is temporarily placed on one vibration isolator, the other vibration isolator is It can be moved along the elliptical curve of the vibration isolator. Thereby, it can suppress that one vibration isolator and another vibration isolator overlap.
According to the second aspect of the present invention, when the vibration isolator is inserted into the thin cylindrical workpiece before the thin cylindrical workpiece is rotated, the other elastic vibration isolator is attached to the cylindrical elastic body of the one vibration isolator. Even when an impact is applied to the cylindrical elastic body of the tool, the holding member can receive the impact. Thereby, the cylindrical elastic body of one vibration isolator is prevented from being greatly deformed, and the elliptical shape can be maintained.
Further, when turning the outer peripheral surface of the thin cylindrical workpiece, the cylindrical elastic body is expanded by a pressing force (centrifugal force) acting on the cylindrical elastic body when pressed against the inner peripheral surface. It is elastically deformed. Thereby, about a cylindrical elastic body, the surface closely_contact | adhered to the said internal peripheral surface can be expanded.
In addition, when turning the outer peripheral surface, the cylindrical elastic body absorbs the impact and deforms even if an impact is applied when pressed against the inner peripheral surface. Thereby, even if a cylindrical elastic body is pressed against the inner peripheral surface, the inner peripheral surface is prevented from being damaged.
According to the invention of claim 3, when the outer peripheral surface is turned, the holding member is also elastically deformed so as to be expanded by the pressing force (centrifugal force) acting on the holding member. For this reason, when the holding member expands and deforms and presses the inner surface of the cylindrical elastic body, it is possible to promote expansion of the cylindrical elastic body.
According to invention of Claim 4, when turning the said outer peripheral surface, when a cylindrical elastic body is pressed against the said inner peripheral surface, it is a thin and strip | belt-shaped elastic material which forms this cylindrical elastic body Due to the pressing force (centrifugal force) acting on the material, it is possible to further facilitate the expansion and deformation due to easy elongation.

It is a perspective view of the vibration isolator of embodiment of this invention. It is explanatory drawing of the method of inserting the vibration isolator in a thin cylindrical workpiece and turning the outer peripheral surface of this thin cylindrical workpiece.

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS. 1 and 2. As will be described later, the vibration isolator 1 shown in FIG. 1 is used to suppress chatter vibration that occurs when the outer peripheral surface of a metal thin cylindrical workpiece 10 is turned. The vibration isolator 1 includes a cylindrical laminated body 2 and a flat plate 4.

  The laminate 2 is formed in a cylindrical shape by winding the sheet member 3 a predetermined number of times while applying a predetermined tension to the belt-shaped sheet member 3. Here, the winding shape of the belt-shaped sheet member 3 was an elliptical shape. Thereby, the shape of the cross section of the vibration isolator 1 becomes elliptical. In the present embodiment, the belt-shaped sheet member 3 is formed of natural rubber (elastic material) having a thickness of about 1 mm. In addition, the laminated body 2 is an example of the elliptical laminated body of this invention.

  The flat plate 4 is inserted into the laminate 2 over the entire length in the direction parallel to the longitudinal direction of the cylindrical laminate 2. The flat plate 4 is fixed so as to be sandwiched in the stacked body 2, thereby suppressing deformation of the stacked body 2. Thereby, the shape of the cross section of the vibration isolator 1 is held in an elliptical shape. In the present embodiment, the flat plate 4 is made of natural rubber, similar to the sheet member 3 described above. The flat plate 4 is an example of the holding member of the present invention.

  Next, a method of turning the outer peripheral surface of the metal thin cylindrical workpiece 10 using the vibration isolator 1 described above will be described. First, the thin cylindrical workpiece 10 shown in FIG. 2 is supported between a lathe spindle (not shown) and a tailstock. By rotating the main shaft, the thin cylindrical workpiece 10 is supported between the main shaft and the tailstock while rotating.

  A plurality of vibration isolator 1 is inserted into the inside 11 of the thin cylindrical workpiece 10. Here, as will be described later, in order to press the plurality of vibration isolator 1 over almost the entire circumference of the inner peripheral surface of the thin cylindrical workpiece 10, the thin cylindrical workpiece 10 extends to the entire length in the axial direction. In this state, as shown in FIG. 2A, five vibration isolator 1 (1 </ b> A to 1 </ b> E) was inserted into the interior 11. At this time, another anti-vibration tool 1 different from each anti-vibration tool may be temporarily placed on each anti-vibration tool 1. In this case, even when the thin-walled cylindrical workpiece 10 is brought into a stationary state without rotating, the other anti-vibration tools 1 are arranged along the elliptical curve corresponding to the outer periphery of each anti-vibration tool 1. It moves downward from the top of the tool 1. For this reason, it is suppressed that the other vibration isolator 1 overlaps with each vibration isolator 1 in an up-down direction, respectively.

  Subsequently, when the main shaft starts rotating in the direction indicated by the arrow in FIG. 2B, the thin-walled cylindrical workpiece 10 and the vibration isolator 1A to 1E rotate, and each vibration isolator 1A. Centrifugal force acts on ~ 1E. In addition, gravity acts on each vibration isolator 1A to 1E. Due to this gravity, when the thin cylindrical workpiece 10 has just started to rotate, it becomes easy for each vibration isolator to move downward along the outer periphery of the other vibration isolator in the vicinity. As the subsequent rotation of the thin cylindrical workpiece 10 continues, each vibration isolator 1A-1E moves in the direction of rotation of the thin cylindrical workpiece 10, and the centrifugal force acting on each vibration isolator 1A-1E increases. To do. As a result, as shown in FIG. 2B, the anti-vibration devices 1A to 1E are prevented from overlapping each other, and the laminate 2 of the anti-vibration devices 1A to 1E (see FIG. 1). Is pressed against the inner peripheral surface of the thin cylindrical workpiece 10.

  Further, when the rotational speed of the main shaft is increased toward a predetermined rotational speed and the thin cylindrical workpiece 10 is rotated, the vibration isolators 1A to 1E move in the rotational direction of the thin cylindrical workpiece 10 and are adjacent to each other. Each tool will be pressed. Accordingly, as shown in FIG. 2C, the vibration isolators 1 </ b> A to 1 </ b> E are disposed along the inner peripheral surface of the thin cylindrical workpiece 10 without overlapping each other.

  In addition to this, the centrifugal force increases in proportion to the increase in the rotational speed of the main shaft, and the laminate 2 of the vibration isolator 1A to 1E is elastically deformed on the inner peripheral surface by the centrifugal force. Pressed. For this reason, as shown to (C) figure of FIG. 2, each vibration isolator 1A-1E receives the said centrifugal force, respectively, and carries out expansion deformation. At this time, the flat plate 4 in each vibration isolator 1A-1E is also expanded and deformed by centrifugal force in the same manner as the laminated body 2, and the flat plate 4 is the inner surface of each laminated body 2 of each vibration isolator 1A-1E. It is fixed so as to be sandwiched in the laminate 2 while pressing. Accordingly, as shown in FIG. 2C, each of the vibration isolators 1A to 1E is in a state in which the minor axis of the transverse section is reduced and the major axis of the transverse section is enlarged and the elliptical shape is maintained. It is pressed against the inner peripheral surface.

  Thereafter, when the rotational speed of the main shaft reaches a predetermined rotational speed, the centrifugal force increases as compared with the state shown in FIG. Therefore, as shown in FIG. 2D, the flat plate 4 is further expanded compared to the state of FIG. 2C by the centrifugal force (see the white arrow in FIG. 2). In addition to the deformation, each of the vibration isolator 1A to 1E has the above-described configuration in which the minor axis of the transverse section is further reduced and the major axis of the transverse section is further enlarged as compared with the state of FIG. It is pressed against the inner surface and comes into close contact. At this time, each of the vibration isolator 1A to 1E pushes the adjacent vibration isolator as the major axis of the cross section increases. Thereby, each anti-vibration tool 1A-1E moves similarly to description of the (C) figure of above-mentioned FIG. 2, and distributes | distributes equally along the internal peripheral surface of the thin cylindrical workpiece 10 without mutually overlapping. Is done.

  In the present embodiment, as described above and as shown in FIG. 2D, the vibration isolators 1 </ b> A to 1 </ b> E are pressed and brought into close contact with the entire circumference of the inner peripheral surface of the thin cylindrical workpiece 10. In this state, the outer peripheral surface of the thin cylindrical workpiece 10 in a rotating state is turned with a cutting tool (not shown). As described above, since the laminate 2 is formed of natural rubber, an impact is applied to each laminate 2 when the laminate 2 that forms each vibration isolator 1A to 1E is pressed against the inner peripheral surface. Even so, each laminate 2 absorbs the impact and elastically deforms.

  As shown in FIG. 2D, if the major axis of the cross section of each vibration isolator 1A to 1E is further expanded, each of the vibration isolators 1A to 1E corresponds to the increase in the major axis. The surface pressed against the inner peripheral surface of the thin cylindrical workpiece 10 becomes wider. Thereby, as a conventional example, each anti-vibration tool 1A-1E is compared with the case where the outer periphery of the anti-vibration device whose cross section is circular like the round bar-shaped anti-vibration device is made to stick to the inner peripheral surface. The surface closely contacting the inner peripheral surface of the thin cylindrical workpiece 10 can be widened. For this reason, the backup force with respect to the said internal peripheral surface increases compared with the conventional example. Thereby, since the rigidity of the thin cylindrical workpiece 10 increases, the vibration-proofing effect can be enhanced in the turning process as compared with the conventional example. Therefore, chatter vibration generated in the thin cylindrical workpiece 10 can be suppressed during turning.

  As described above, in this embodiment, the anti-vibration effect is enhanced as compared with the conventional example. For this reason, when each vibration isolator 1A-1E is arrange | positioned apart from each other without overlapping each other along the inner peripheral surface, there is a gap between the vibration isolators 1 adjacent along the inner peripheral surface. Even if it is provided, chatter vibration can be suppressed from occurring in the thin cylindrical workpiece 10 during the above-described turning process. Therefore, since it is not necessary to arrange the vibration isolator 1 without a gap over the entire circumference of the inner peripheral surface, the number of the vibration isolator 1 to be inserted into the inside 11 of the thin cylindrical workpiece 10 is appropriately and flexibly used. The occurrence of chatter vibration can be suppressed while adjusting.

  When the turning of the thin cylindrical workpiece 10 is stopped by stopping the rotation of the main shaft after the above-described turning process is finished, centrifugal force does not act on the vibration isolators 1A to 1E. For this reason, the shape of the cross section of each vibration isolator 1A-1E restore | restores to the elliptical shape as shown to (A) figure of FIG. 2 with the elastic force of the laminated body 2. FIG.

<Effect of this embodiment>
In this embodiment, the shape of each vibration isolator 1A-1E was made into an elliptical shape. For this reason, as compared with the conventional example, the outer peripheral surface of the thin cylindrical workpiece 10 is compared with the case where a part of the outer periphery of the round-bar-shaped vibration isolator is pressed against the inner peripheral surface of the thin cylindrical workpiece 10. When performing the turning process, it is possible to widen the surface where each of the vibration isolators 1A to 1E is pressed against the inner peripheral surface. Accordingly, the backup force for the inner peripheral surface can be increased when the outer peripheral surface is turned as compared with the conventional example.
Further, when turning the outer peripheral surface of the thin cylindrical workpiece 10, when the vibration isolator 1 </ b> A to 1 </ b> E is inserted into the inside 11 of the thin cylindrical workpiece 10, as described above, On top of this, other anti-vibration devices 1 different from the respective anti-vibration devices may be temporarily placed. Even in this case, if the shape of each vibration isolator 1 is an elliptical shape, as described above, the other vibration isolator 1 can be prevented from overlapping each vibration isolator 1 in the vertical direction.

As for each said vibration isolator 1A-1E, the cylindrical laminated body 2 is shape | molded by natural rubber (elastic material), and the flat plate 4 is inserted in this laminated body 2, respectively. For this reason, when the five anti-vibration devices 1 (1A to 1E) are inserted into the interior 11 when the thin-walled cylindrical workpiece 10 is brought into a stationary state without being rotated, Even when the laminate 2 of the other vibration isolator 1 is placed and an impact is applied, the flat plate 4 can receive the impact. Thereby, it can prevent that the laminated body 2 of each vibration isolator 1 deform | transforms significantly, and can maintain elliptical shape.
Furthermore, since the cylindrical laminated body 2 is formed of natural rubber as described above, when the outer peripheral surface of the thin-walled cylindrical workpiece 10 is turned, the laminated body 2 is caused to rotate by the centrifugal force. When pressed against the surface, the laminate 2 can be expanded and deformed as described above. Thereby, in each vibration isolator 1A-1E, the surface which the said laminated body 2 presses on the said internal peripheral surface and adheres becomes wide. Therefore, as the surface where each vibration isolator 1A-1E adheres to the inner peripheral surface becomes wider, each vibration isolator 1A-1E increases the backup force for the inner peripheral surface as compared with the conventional example. Can be made.
In addition, when the laminate 2 is pressed against the inner peripheral surface when the outer peripheral surface is turned as described above, the laminate 2 is formed of natural rubber. The body 2 is elastically deformed by absorbing the impact applied thereto. Thereby, even if the laminated body 2 is pressed against the said internal peripheral surface, it can suppress damaging this internal peripheral surface.

  Further, as described above, the flat plate 4 is made of natural rubber. Therefore, as described above, when the laminate 2 is pressed against the inner peripheral surface, the flat plate 4 is also expanded and deformed by the centrifugal force acting on the laminate 4 while pushing the inner surface of the laminate 2. 2 so as to be sandwiched between the two. Therefore, it can be promoted that the laminate 2 is expanded and deformed as the flat plate 4 pushes the inner surface of the laminate 2.

  Furthermore, as described above, the cylindrical laminate 2 was formed by winding the strip-shaped sheet member 3 formed of natural rubber having a thickness of about 1 mm into an elliptical shape. For this reason, as described above, when the laminate 2 is pressed against the inner peripheral surface, the laminate 2 is easily extended and deformed by the centrifugal force acting on the thin-walled sheet member 3 (thickness is about 1 mm). Is further promoted.

  The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention. In this embodiment, the laminated body 2 and the flat plate 4 are formed using natural rubber, but the laminated body 2 and the flat plate 4 may be formed of an elastic material such as various synthetic rubbers different from natural rubber.

  Moreover, in this embodiment, although the five vibration isolator 1 (1A-1E) was inserted in the inside 11 of the thin-walled cylindrical workpiece 10, not only this but four or less or six or more vibration isolator 1 is provided. Each may be inserted. Further, in the present embodiment, the vibration isolator 1 is formed by inserting the flat plate 4 into the cylindrical laminate 2, but the present invention is not limited to this, and for example, the flat plate 4 is inserted into a rubber pipe to prevent vibration. A tool may be formed.

  1 .... Vibration isolator 2 .... Laminated body 3 .... Strip-shaped sheet member 4 .... Flat plate 10 .... Thin cylindrical workpiece

Claims (5)

When turning the outer peripheral surface of the thin-walled cylindrical workpiece rotatably supported, the thin-walled cylindrical workpiece is inserted into the thin-walled cylindrical workpiece and extends in the axial direction of the thin-walled cylindrical workpiece. A vibration isolator that is pressed against the inner peripheral surface of the thin cylindrical workpiece and suppresses chatter vibration of the thin cylindrical workpiece,
A vibration isolator, wherein the cross section of the vibration isolator has an elliptical shape.   The vibration isolator according to claim 1, wherein the vibration isolator is formed of a cylindrical elastic body, and a holding member that holds the elliptical shape is inserted into the cylindrical elastic body.   The vibration isolator according to claim 2, wherein the holding member is an elastic body.   4. The vibration isolator according to claim 2, wherein the cylindrical elastic body is formed of an elliptical laminated body in which thin and strip-like elastic materials are wound in an elliptical shape and laminated. Turning a thin-walled cylindrical workpiece in which a vibration isolator extending in the axial direction of the thin-walled cylindrical workpiece is inserted into a thin-walled cylindrical workpiece rotatably supported, and the thin-walled cylindrical workpiece is rotated to turn the outer peripheral surface of the thin-walled cylindrical workpiece In the method
A thin cylindrical workpiece turning method, wherein the vibration isolator according to any one of claims 1 to 4 is inserted into the thin cylindrical workpiece.

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