JP6145396B2 - Machine tool steady rest device - Google Patents

Description

  The present invention, for example, in a machine tool configured to machine an outer peripheral surface or an end surface of a work by rotating a long work and causing a tool to act on the work, switches the centering and resting of the work. The present invention relates to a steady-state steadying device that can be performed in a conventional manner.

For example, in a lathe, when machining the workpiece by applying a tool to the workpiece while rotating the workpiece, especially when the workpiece is a long object, it is necessary to push the The end surface is supported or the outer peripheral surface of the workpiece is supported by a steady rest.

In recent years, a machining center has been developed that enables a workpiece to be turned by mounting a rotary table having a mechanism for rotating the workpiece on the work table. Some of these types of machining centers are provided with a tailstock and a steady rest as in the lathe.

For example, Patent Document 1 includes a lathe spindle 14 that is fixedly disposed on a bed 2 and that drives the workpiece 20 to rotate, and a support 44 that is rotatably disposed on the bed 2 by a lidar 50. A structure in which three sets of holders 54, 56, and 58 that serve as center pushers or steady rests are arranged at predetermined angular intervals on the upper surface is disclosed. In this conventional apparatus, the end surface or the outer peripheral surface of the rod-shaped workpiece is machined by switching the center 44 and the steady rest by rotating the support 44 so that one of the holders is coaxial with the main shaft 14. Like to do.

Japanese Patent No. 4323135

By the way, in the said conventional apparatus, the support 44 which is a comparatively large structure which supports three sets of holders is rotated about 180 degree | times, and it switches between a center pushing and steadying, and the support 44 is large sized. Therefore, it takes time to switch, and therefore the conventional apparatus is not suitable for high-speed machining.

  The present invention has been made in view of the above-described conventional situation, and it is an object of the present invention to provide a steady rest device for a machine tool that can switch steady rest and tail press in a short time and can realize high-speed machining. Yes.

The invention of claim 1 is a machine tool comprising a work spindle that rotationally drives a work, and a tool spindle that causes a tool to act on the work to machine the work.
A tailstock steadying device comprising a tailstock portion that supports the end surface of the workpiece and a steadying portion that supports the outer peripheral surface of the workpiece,
A rotation member disposed so as to be rotatable about a rotation axis parallel to the rotation axis of the work spindle and movable in the direction of the rotation axis;
The center pushing part and the steadying part are arranged adjacent to the rotating member so as to be positioned on an arc passing through the rotation axis of the work spindle with the rotation axis as a center when viewed in the rotation axis direction. It is characterized by being.

A second aspect of the present invention provides the center steady rest apparatus for a machine tool according to the first aspect,
The rotating member includes a position in use where a center line of the center pushing part or the steadying part is coaxial with a rotation axis of the work spindle, and the center pushing part and the steadying part are predetermined from the rotation axis of the work spindle. It is characterized in that it can be rotated between a retracted position that is more than an angle away.

The invention of claim 3 is the steady rest device for the machine tool according to claim 2,
An axial movement mechanism for moving a rotation shaft fixed to the rotation member in the direction of the rotation axis, and a rotation mechanism for rotating the rotation shaft about the rotation axis. Yes.

A fourth aspect of the present invention relates to the steady rest device for a machine tool according to any one of the first to third aspects,
The machine tool includes a tool changer and a work table having a turning mechanism, and is a machining center for machining a work on the work table by rotating the tool spindle, and the work is rotated on the work table. A rotating table is provided, and the tailrest steadying device is mounted on the work table.

  According to the first aspect of the present invention, the rotating member disposed so as to be rotatable around the rotation axis is positioned on an arc passing through the rotation axis of the work spindle with the rotation axis as the center. Since the center pushing part and the steadying part are arranged adjacent to each other, the pivoting member can be switched by a slight angle to switch between the tailing and the steadying, and the conventional relatively large support is rotated by about 180 °. Compared with the equipment, the switching time can be greatly shortened and high-speed machining can be realized.

  According to the second aspect of the present invention, since the rotating member can be rotated between the use position and the retracted position, depending on the processing content, the rotating member, the center pushing portion, and the steadying portion may be connected to the tool spindle. In the case of interference in processing, such as interference, the rotating member can be retracted to the retracted position together with the center pushing portion and the steady rest portion easily and in a short time, and the processing can be executed smoothly.

According to the invention of claim 3, since the pivot member is provided with an axial movement mechanism that moves the pivot member in the pivot axis direction and a pivot mechanism that rotates the pivot member around the pivot axis, Can be performed easily and reliably, and both can be switched easily and reliably, and the retreat to the retreat position can be performed easily and reliably in a short time.

  According to the fourth aspect of the present invention, the rotation table for rotating the workpiece is provided on the work table of the machining center, and the center push-down device is mounted on the work table, so that the present apparatus can be easily applied to the machining center.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a machining center provided with a turntable with a tailrest device according to Embodiment 1 of the present invention. It is a front perspective view of the center-holding steadying apparatus with which the turning table was equipped. FIG. 3 is a side view of the tailstock steadying device attached to the turning table. It is a front perspective view of the rotation member part of the said center-holding steady apparatus. It is a top view of the rotation member of the said center-holding steadying apparatus. It is a cross-sectional front view of the said center-holding steady apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  In the figure, reference numeral 1 denotes a machining center provided with a tailrest device 2 according to an embodiment of the present invention. The machining center 1 includes a bed 3, a first movable base 4 that is mounted on the left and right side walls 3a and 3a of the bed 3 so as to be movable in the Y-axis (front-rear) direction, A second movable table 5 mounted on the movable table 4 so as to be movable in the X-axis (left and right) direction, and a spindle head 6 mounted on the second movable table 5 so as to be movable in the Z-axis (up and down) direction. And. A tool spindle 7 is rotatably disposed in the spindle head 6, and a tool T is mounted on the lower end portion of the tool spindle 7. Although not shown, the machining center 1 includes a tool changer that automatically changes the tool T.

Further, between the left and right side walls 3a, 3a of the bed 3, a swivel base 8 having an L shape in a side view is disposed. The swivel base 8 constitutes the L-shaped vertical side, the base portion 8a supported on the back wall 3b of the bed 3 so as to be pivotable about the B axis parallel to the Y axis, and the L shape. And a table portion 8b that forms a horizontal side of the shape and that extends horizontally toward the front side following the base portion 8a.

A turntable 9 is mounted on the table portion 8 b of the swivel base 8. The rotary table 9 has a work spindle that is driven to rotate about a C axis parallel to the Z axis, and a chuck 9a is provided at the upper end of the work spindle. Is gripped.

  The tailstock steadying device 2 fixes a rotation member 11 to an upper end portion of a rotation shaft 10 having a rotation axis C ′ parallel to the rotation axis C of the work spindle, and the rotation shaft 10 is connected to a shaft. The moving mechanism 14 is moved in the direction of the rotation axis C ′, and the rotation mechanism 15 is rotated around the rotation axis C ′.

The rotating member 11 includes a center pushing portion 12 having a center 12a for supporting the axial center portion of the tip end surface Wa of the work W, and a steadying portion 13 having a support ring 13a for supporting the outer peripheral surface Wb of the work W. I have. The center 12a and the support ring 13a are rotatably supported by the rotating member 11.

As shown in FIG. 5, the tail pusher 12 and the steady rest 13 are arcs R passing through the rotation axis C of the work spindle with the rotation axis C ′ as the center when viewed in the direction of the rotation axis C ′. The rotating member 11 is disposed adjacent to the rotating member 11 at a predetermined angular interval so as to be positioned above. The predetermined interval is an interval that does not interfere with each other in view of the assumed workpiece diameter, that is, the steadying portion 13 interferes with the workpiece at the time of centering or the tailing portion 12 contacts the workpiece at the time of steadying. An interval that does not interfere.

Here, the rotating member 11 includes a position A in use where the center line of the tailstock 12 or the steady rest 13 is coaxial with the rotation axis C of the work spindle, the tailstock 12 and the steady rest 13. Is capable of rotating between a retraction position B that is more than a predetermined angle away from the rotation axis C of the work spindle. The retreat position B is the tool spindle 7, the rotating member 11, the tail pushing part 12, or the steadying part 13 when the work W is processed while the swivel base 8 is swiveled and positioned at a desired angular position. Means a position where no interference occurs.

The axial movement mechanism 14 is disposed in a guide member 16 having a U-shaped cross section arranged in the vertical direction, and the ball screw 17 is arranged in the vertical direction so as to be rotatable and non-movable in the axial direction. A nut member 19 is screwed onto the ball screw 17 and a servo motor 20 is connected to the upper end of the ball screw 17.

The nut member 19 is moved up and down by rotationally driving the ball screw by the servo motor 20. The guide member 16 is bolted and fixed to a base plate 22 fixed to the front end of the table portion 8b of the swivel base 8.

The rotation mechanism 15 supports the lower end portion of the rotation shaft 10 so as not to be relatively movable in the axial direction by the lower end bearing 24a, and rotates the middle portion thereof relative to the axial direction by the midway bearing 24b and rotates. Supports force transmission. The midway bearing 24b is fixed to the base plate 22 via a bracket 22b, and the lower end bearing 24a is coupled to the nut member 19 of the shaft movement mechanism 14 via a bracket 22a. The bracket 22a is broken in the middle of FIG. Reference numeral 10a denotes a bellows structure cover disposed so as to surround the rotating shaft 10, and is extendable in the axial direction.

A servomotor 23 is disposed on the base plate 22 with its axis parallel to the rotating shaft 10. A drive pulley 25 is connected to the drive shaft 25 a connected to the output shaft 23 a of the servomotor 23. The drive pulley 25 and the driven pulley 26 fixed to the lower end of the midway bearing 24 b are connected by a transmission belt 27.

  In this embodiment, when turning with the workpiece W centered, the workpiece W is gripped in the vertical direction by the chuck 9b of the workpiece spindle, and the center 12a of the center pushing portion 12 is set to the rotation axis C. The rotating member 11 is indexed and positioned by the rotating mechanism 15 so as to coincide with each other, and then the rotating shaft 10 so that the tip end portion of the center 12a of the center pushing portion 12 abuts on the axial center portion of the end surface Wa of the workpiece W. Is lowered by the axial movement mechanism 14. In this state, the work spindle is driven to rotate, and the swivel base 8 is turned 90 degrees, for example, and the tool T is applied to the outer peripheral surface Wb of the work W while the rotation of the tool spindle 7 is fixed. Is done.

On the other hand, when the end surface Wa or the outer peripheral surface Wb is processed in a state where the workpiece W is steady, the turning member 11 is arranged so that the axis of the support ring 13a of the steadying portion 13 coincides with the rotation axis C by the turning mechanism 15. The pivoting member 11 is lowered by the axial movement mechanism 14 so that the support ring 13a of the steadying portion 13 is in sliding contact with the outer peripheral surface Wa of the workpiece W. In this state, the work spindle is driven to rotate, and the tool T is allowed to act on the end surface Wa of the work W while the rotation of the tool spindle 7 is fixed. The machining is carried out in this way by acting on the outer peripheral surface Wb.

  In this embodiment apparatus, the rotating member 11 is disposed adjacent to the center pushing portion 12 and the steady rest portion 13 so as to be positioned on an arc R passing through the rotation axis C of the work spindle with the rotation axis C ′ as the center. Therefore, by rotating the rotating member 11 by a slight angle, it is possible to switch between the center pushing and the steady rest, and the switching time is longer than that of the conventional device that rotates a relatively large support by about 180 °. It can be shortened and high speed machining can be realized.

  Further, since the rotation member 11 can be rotated between the use position A and the retreat position B, the rotation member 11, the tail pushing portion 12, and the steadying portion 13 interfere with the tool spindle 7 depending on the processing content. In the case where it interferes with the processing, such as, it is possible to smoothly execute the processing by retracting the rotating member 11 together with the tail pushing portion 12 and the steady rest portion 13 to the retreat position B.

Furthermore, since the pivot member 11 is provided with an axial mechanism 14 for moving the pivot member 11 in the direction of the pivot axis C ′ and a pivot mechanism 15 for pivoting the pivot member 11 about the pivot axis C ′. Stopping can be performed easily and reliably, and both can be switched, and retraction to the retreat position B can be performed easily and reliably.

  Further, in this embodiment, the tailrest steadying device 2 is applied to the machining center 1 provided with the rotary table 9 on the table portion 8b of the swivel base 8. Therefore, the present embodiment apparatus 2 is used as the swivel base. It can be easily applied to the machining center 1 simply by being fixed to the eight table portions 8b.

In the above-described embodiment, the turning process in which the tool T is applied while rotating the workpiece W has been described. However, the tailstock steadying device 1 according to the present invention rotates the tool spindle 7 while fixing the workpiece W. However, it is also useful in drilling for causing the tool T to act on the workpiece W. In this case, the tailstock steadying device 1 is used as a pressing member that simply presses the workpiece W so that chatter does not occur.

In addition, the applicable range of the steady rest device according to the present invention is not limited to the machining center, and is a machine tool that performs machining by rotating a relatively long workpiece. Any machine tool that requires pushing and steadying can be applied.

1 Machining center (machine tool)
2 Tail steady rest device 7 Tool spindle 8b Table (work table)
DESCRIPTION OF SYMBOLS 9 Rotating table 9a Work spindle 10 Rotating shaft 11 Rotating member 12 Tail pushing portion 13 Stabilizing portion 14 Axis moving mechanism 15 Rotating mechanism A Position in use B Position in retraction C Rotating axis C ′ Rotating axis R Arc T W Workpiece Wa Work end face Wb Workpiece outer peripheral surface

Claims (4)

In a machine tool comprising a work spindle for rotating a work and a tool spindle for machining the work by causing a tool to act on the work,
A tailstock steadying device comprising a tailstock portion that supports the end surface of the workpiece and a steadying portion that supports the outer peripheral surface of the workpiece,
A rotation member disposed so as to be rotatable about a rotation axis parallel to the rotation axis of the work spindle and movable in the direction of the rotation axis;
The center pushing part and the steadying part are arranged adjacent to the rotating member so as to be positioned on an arc passing through the rotation axis of the work spindle with the rotation axis as a center when viewed in the rotation axis direction. A steady rest device for a machine tool characterized by comprising: In the machine tool steady rest device according to claim 1,
The rotating member includes a position in use where a center line of the center pushing part or the steadying part is coaxial with a rotation axis of the work spindle, and the center pushing part and the steadying part are predetermined from the rotation axis of the work spindle. A push-push steadying device characterized by being capable of rotating between a retracted position that is more than an angle away. 3. The machine tool steady rest device for a machine tool according to claim 2,
An axial movement mechanism that moves a rotation shaft fixed to the rotation member in the direction of the rotation axis, and a rotation mechanism that rotates the rotation shaft about the rotation axis. A steady-state steadying device. In the machine tool steady rest device according to any one of claims 1 to 3,
The machine tool includes a tool changer and a work table having a turning mechanism,
A machining center for machining a work on the work table by rotating a tool spindle;
The work table is provided with a rotating table for rotating the work,
The centering steady apparatus of a machine tool, wherein the centering steadying apparatus is mounted on the work table.

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