JP2016155205A - Chattering vibration preventing jig for workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chattering vibration preventing jig for a workpiece, which can prevent the chattering vibration of the workpiece easily and reliably.SOLUTION: A workpiece chattering vibration preventing jig 1 comprises: an expansion body 10 expansible in the axial direction; a first adsorbent 20 and a second adsorbent 30 disposed at the two axial ends of the expansion body 10; and a fixing portion 40 for fixing the expansions of the expansion body 10. The first absorbent 20 includes a magnet body, and changeover means 22 for changing the magnetic force of the magnet body in a suction part 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a workpiece chatter vibration preventing jig for preventing chatter vibration of a workpiece in machining.

  When machining a workpiece such as cutting, there is a risk of so-called chatter vibration on the workpiece due to the force received from the tool, which may cause problems such as noise generation and reduced machining accuracy. For this reason, this measure has been studied in the past. For example, in Patent Document 1, as shown in FIG. 7, a cylinder 53 having a bolt 53 provided with a magnet 52 at an end of a head 51 and a magnet 54 at an end and a thread groove on an inner peripheral surface. There is disclosed a chattering prevention jig 50 that includes a jig main body 55, a bolt 53 is screwed into the jig main body 55, and can be fixed to a desired length by a fixing nut 56.

  When the chattering prevention jig 50 is used, the workpiece fixed to the machine tool 60 as shown in FIG. 8 with the bolt 53 screwed into the jig main body 55 as shown in FIG. The magnet 54 of the jig main body 55 is attracted and fixed to the square mass 62 by inserting it between the 70 and the square mass 62 placed on the transport table 61 of the machine tool 60. Next, the bolt 53 is rotated to extend the overall length of the chattering prevention jig 50, and the magnet 52 is attracted and fixed to the workpiece 70. Thereafter, the chattering prevention jig 50 can be fixed between the square mass 62 and the workpiece 70 by tightening the fixing nut 56.

JP 2008-87138 A

  The conventional chattering prevention jig 50 prevents the workpiece 70 from bending in both directions up and down because the magnets 52 and 54 arranged at both ends are firmly attached to the workpiece 70 and the square mass 62, respectively. The chatter vibration of the workpiece 70 being processed can be suppressed.

  However, if the magnetic force of the magnets 52 and 54 is increased in order to reliably prevent chatter vibration, the chatter prevention jig 50 is likely to be attracted to the square mass 62 and the workpiece 70 unexpectedly, and chatter to the workpiece 70 is prevented. There is a possibility that positioning of the prevention jig 50 may be difficult, and further, when finely adjusting the position of the chatter prevention jig 50, it is difficult to remove the magnet 52 from the workpiece 70 by screwing the bolt 53. Therefore, there was a problem that workability was poor.

  Therefore, an object of the present invention is to provide a workpiece vibration preventing jig that can easily and reliably prevent chatter vibration of a workpiece.

  The object of the present invention is to fix an expansion / contraction body that can be expanded and contracted in the axial direction, a first adsorbent body and a second adsorbent body that are respectively provided at both axial ends of the expansion body, and expansion and contraction of the expansion body. The first attracting member is achieved by a chatter vibration preventing jig for a workpiece including a magnet body and switching means for changing the attracting force by the magnet body.

  In the workpiece chatter vibration preventing jig, the switching means preferably includes an operation member for rotating the magnet body.

  The first adsorbent is preferably connected to the expandable body via a spherical bearing, and an O-ring is preferably interposed between the first adsorbent and the expandable body. .

  According to the workpiece chatter vibration preventing jig according to the present invention, the chatter vibration of the workpiece can be easily and reliably prevented.

1 is a side view of a workpiece chatter vibration preventing jig according to a first embodiment of the present invention. It is sectional drawing of the chatter vibration preventing jig of the workpiece shown in FIG. It is a schematic block diagram which shows the principal part of the chatter vibration preventing jig of the workpiece shown in FIG. It is a schematic block diagram for demonstrating the action | operation of the principal part of the chatter vibration prevention jig | tool of a workpiece shown in FIG. It is sectional drawing of the chatter vibration prevention jig | tool of the to-be-processed object which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the chatter vibration prevention jig | tool of the to-be-processed object which concerns on the 3rd Embodiment of this invention. It is a side view of the conventional chatter vibration preventing jig. It is a perspective view which shows the use condition of the chatter vibration prevention jig | tool shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 and FIG. 2 are a side view and a sectional view of a chatter vibration preventing jig for a workpiece according to the first embodiment of the present invention. As shown in FIG. 1 and FIG. 2, a chatter vibration preventing jig 1 for a workpiece includes a stretchable body 10 that can be stretched in the direction of the axis L and first ends provided at both ends of the stretchable body 10 in the direction of the axis L. The adsorbing body 20 and the second adsorbing body 30, and a fixing member 40 that fixes expansion and contraction of the expansion and contraction body 10 are provided.

  The stretchable body 10 includes a first tubular body 11 and a second tubular body 12. The tip of the first cylindrical body 11 is connected to the first adsorption body 20 via a spherical bearing 13 and is supported so as to be rotatable in all directions around the spherical bearing 13. An O-ring 14 is interposed between the first cylindrical body 11 and the first adsorption body 20 so as to surround the spherical bearing 13. The O-ring 14 is held by a flange portion 11 a that protrudes outward from the outer peripheral surface near the tip of the first cylindrical body 11. When the proximal end side of the first tubular body 11 is inserted into the second tubular body 12 in a nested manner, the stretchable body 10 expands and contracts.

  The second cylindrical body 12 has a second adsorbent 30 integrally formed at the tip. A screw portion 12a is formed on the outer peripheral surface of the second cylindrical body 12, a taper portion 12b is provided from the screw portion 12a toward the proximal end, and a fixing member 40 made of a nut is screwed into the screw portion 12a. To do. The tapered portion 12 b is divided into a plurality of portions in the circumferential direction by radially formed slits, and is pressed by the fastening of the fixing member 40 to reduce the diameter, thereby fixing the first cylindrical body 11.

  A spring member 15 made of a coil spring or the like is inserted into the first cylindrical body 11 and the second cylindrical body 12. One end of the spring member 15 is locked to a locking portion 11b formed on the inner peripheral surface of the first cylindrical body 11, and the other end is in contact with the inner surface of the second adsorbent 30. It is energized in the direction to extend 10 from the contracted state.

  The first attracting body 20 includes a magnet base having an attracting portion 21 at the tip in the axis L direction, and includes an operation member 22 as a switching unit that switches on / off of attracting in the attracting portion 21.

  FIG. 3 is a schematic configuration diagram of the first adsorbent 20. As shown in FIG. 3, the first adsorption body 20 includes a magnet body 23 made of a cylindrical permanent magnet magnetized in the radial direction, and a casing 24 that holds the magnet body 23. The magnet body 23 is connected to the operation member 22 (see FIGS. 1 and 2), and can be rotated in the casing 24 by a rotation operation of the operation member 22. The casing 24 is configured by interposing non-magnetic bodies 27 and 28 between a pair of blocks 25 and 26 made of a magnetic material such as iron, and the adsorbing portion 21 is formed on one non-magnetic body 28 side. Yes.

  As shown in FIG. 3, the first adsorbing body 20 configured as described above has a magnetic force line M <b> 1 of the magnet body 23 in a state where the N pole and the S pole of the magnet body 23 face the nonmagnetic bodies 27 and 28, respectively. Passes through only one of the pair of blocks 25 and 26 and is confined in each of the blocks 25 and 26, so that the magnetic force generated between the magnetic body (not shown) contacting the attracting portion 21 is very small. Become. On the other hand, when the magnet body 23 shown in FIG. 3 is rotated by 90 ° in the direction of the arrow, the magnetic lines of force M2 pass through both the pair of blocks 25 and 26 as shown in FIG. A strong magnetic force is generated between the magnetic body (not shown) in contact therewith. Thus, the attraction force in the attraction portion 21 can be changed by the rotation of the magnet body 23 by the operation of the operation member 22.

  As shown in FIG. 2, the second adsorbent 30 has an adsorbing portion 31 formed of a shallow concave portion at the tip in the axis L direction. The suction part 31 is surrounded by an O-ring 32 and is connected to the suction pipe V of the suction device via the communication path 33 so that the inside of the suction part 31 has a negative pressure and sucks an object to be adsorbed (not shown). can do.

  The workpiece chatter vibration preventing jig 1 having the above-described configuration can be used, for example, interposed between the square mass 62 and the workpiece 70 shown in FIG. The chatter vibration preventing jig 1 turns off the suction of the first adsorbent 20 by operating the operation member 22 in advance and loosens the fixing member 40 in advance. Then, in a state where the expansion body 10 is contracted against the urging force of the spring member 15, the chatter vibration preventing jig 1 is connected to the square mass 62 and the work piece 70 so that the first adsorbent body 20 faces downward. Insert between. The stretchable body 10 is extended by the biasing force of the spring member 15, the suction portion 21 of the first suction body 20 abuts on the upper surface of the square mass 62, and the suction portion 31 of the second suction body 30 is the workpiece 70. It contacts the lower surface of the.

  Next, the chatter vibration preventing jig 1 is moved along the upper surface of the square mass 62, and a suction device (not shown) is operated at a desired position to start suction by the second adsorbent 30. The adsorbent 30 is adsorbed and fixed to the workpiece 70. Thereafter, the operation of the operation member 22 turns on the adsorption of the first adsorbent 20, and adsorbs the adsorbing part 21 to the square mass 62 by magnetic force. Finally, the fixing member 40 is fastened to fix the length of the stretchable body 10. Thus, the chatter vibration preventing jig 1 can be firmly fixed between the square mass 62 and the workpiece 70, and chatter vibration during the processing of the workpiece 70 can be suppressed. In the present embodiment, the first adsorber 20 is fixed to the square mass 62 after the second adsorbent 30 is fixed to the workpiece 70, but the first adsorbent 20 is first fixed to the square mass 62. The second adsorbent 30 may be fixed to the workpiece 70 after being fixed to the workpiece 70.

  The chatter vibration preventing jig 1 of the present embodiment can change the attracting force in the attracting portion 21 of the first attracting body 20 by rotating the magnet body 23 by operating the operating member 22. Therefore, by switching the suction of the suction portion 21 from ON to OFF, positioning with respect to the workpiece 70 and removal after the suction can be easily performed, and workability can be improved.

  Further, since the first adsorbing body 20 is connected to the stretchable body 10 via the spherical bearing 13, the stretchable body 10 is centered on the spherical bearing 13 even when the workpiece 70 is distorted. By rotating, the first adsorbent 20 can easily follow the distortion of the workpiece 70. Further, the O-ring 14 interposed between the stretchable body 10 and the first adsorbent body 20 is elastically deformed with the rotation of the stretchable body 10, so that the chatter vibration preventing jig 1 is securely attached. be able to.

  As mentioned above, although one Embodiment of this invention was explained in full detail, the specific aspect of this invention is not limited to the said embodiment. For example, in the present embodiment, the spring member 15 is inserted into the first cylindrical body 11 and the second cylindrical body 12 constituting the expansion body 10, and the expansion body 10 is moved by the urging force of the spring member 15. Although the length of the stretchable body 10 can be adjusted quickly and easily by extending, the first tubular body 11 is used as shown in FIG. 5 without using the spring member 15. A threaded portion 11c may be formed on the outer peripheral surface of the second cylindrical body 12 so that the expansion / contraction length of the expansion / contraction body 10 can be adjusted by screwing with the inner peripheral surface of the second cylindrical body 12.

  In the present embodiment, the second adsorber 30 is configured to be able to reliably adsorb even an object to be adsorbed made of a nonmagnetic material such as stainless steel by adopting a vacuum adsorption method. However, as shown in FIG. 6, the structure provided with magnet body 34 'which consists of permanent magnets in adsorption | suction part 31' of 2nd adsorption body 30 'may be sufficient. 5 and 6, the same components as those in FIG. 2 are denoted by the same reference numerals. The chatter vibration preventing jig of the workpiece having the configuration shown in FIG. 6 is preferably arranged so that the first adsorbing body 20 that can be switched on and off is adsorbed to the workpiece.

DESCRIPTION OF SYMBOLS 1 Workpiece chatter vibration prevention jig | tool 10 Telescopic body 13 Spherical bearing 14 O-ring 20 1st adsorption body 21 Adsorption part 22 Operation member 23 Magnet body 30 2nd adsorption body

Claims (3)

A stretchable body that can stretch in the axial direction;
A first adsorbent and a second adsorbent respectively provided at both axial ends of the stretchable body;
A fixing member for fixing expansion and contraction of the elastic body,
The first attracting body is a chatter vibration preventing jig for a workpiece, comprising a magnet body and switching means for changing the attracting force by the magnet body.   The chatter vibration preventing jig according to claim 1, wherein the switching unit includes an operation member that rotates the magnet body. The first adsorbent is connected to the stretchable body via a spherical bearing,
3. The chatter vibration preventing jig for a workpiece according to claim 1, wherein an O-ring is interposed between the first adsorbent and the stretchable body.

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