JP2003211335A - Work support device for machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work support device capable of centering a work, machining it by clamping, and machining it by preventing from vibrating in a single machine tool. <P>SOLUTION: This machine tool is so formed that a dividing device base 30 is attached to a table 25, a dividing shaft 31 of the dividing device 14 is rotatably and dividably provided to the dividing device base, and one side of the work 4 is detachably mounted on a work mount part 32 of the dividing shaft. The work support device 15 is provided with a work support device base 40 attached to the table, a moving body 41 movable in a U shaft direction in parallel to the axis CL<SB>3</SB>of the dividing shaft 31, a pair of clamping members 42 and 43 provided to the moving body movably in a V shaft direction and capable of clamping the outer circumferential part of the work, and clamp member drive means advancing/retreating a pair of clamping members in a position clamping the work and a position releasing the clamping state. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work support device for a machine tool for supporting an outer peripheral portion such as the other end of a work piece while one end of the work piece is supported by an indexing device. Regarding

[0002]

In Japanese Utility Model Laid-Open No. 63-53633, a work (workpiece) magazine is provided in front of a table of a machine tool, an indexing device is provided on the table, and a space between the indexing device and the work magazine is provided. There is described a machining center with a three-dimensional pool line in which an automatic work changing device capable of changing works is arranged. Japanese Utility Model Laid-Open No. 6-50736 is provided with work tailing means capable of supporting and processing both ends of a work by center-supporting the other end of a long work having one end attached to an indexing device. An indexing device is described. Japanese Patent Laid-Open No. 2000-17677
No. 0 publication discloses a machine tool in which the other end side of a work whose one end is gripped by a rotary head is supported or clamped by a support base and a clamp device so that a rotary indexing operation and a clamping operation can be performed. The work holding device is described. In Japanese Patent Laid-Open No. 10-118892, the work is held at a low pressure to obtain the center position of the runout, the pressure is switched to a high pressure suitable for cutting, and the supply pressure to each cylinder device is controlled so as to maintain the center position of the runout. The technique to do is described.

[0003]

When supporting an elongated work piece with a tool holder having a tapered shank, the work piece is generally more prominent in its outwardly projecting part than in its part held by the tool holder. Becomes longer. In that case, if the workpiece is not clamped in the centered state and machining is not performed, runout may occur at the protruding tip of the workpiece.If machining is performed in this state, the machining accuracy may decrease. is there. Further, a spiral groove or the like may be formed on the outer peripheral portion of the work piece having relatively low rigidity. In this case, if the steady rest is not placed in the immediate vicinity of the machining point of the workpiece, the machining operation is performed when the indexing operation of the workpiece and the movement operation of the tool in the axial direction of the workpiece are synchronized. There is a risk of chattering (vibration of the cutting edge) or deterioration of processing accuracy. However, in the above-mentioned four publications, a single machine tool is used to perform centering of a workpiece, machining by clamping or clamping the workpiece, and loosening the clamping force to prevent the workpiece from swaying and indexing. There is no disclosure of a technique capable of continuously performing each operation such as only the operation or the indexing operation and the operation of moving the workpiece in the axial direction in synchronization.

The present invention has been made in order to solve such a problem, and it is one machine tool that performs centering of a workpiece, machining by clamping or clamping the workpiece, and swinging of the workpiece. An object of the present invention is to provide a workpiece support device for a machine tool that can perform machining while stopping.

[0005]

In order to achieve the above-mentioned object, a work supporting device for a machine tool according to the present invention is such that an indexing device base is attached to a table or a pallet on the table, and A machine tool in which an indexing shaft is rotatably indexed on the indexing device base, and one end side of a workpiece is detachably mounted on a work mounting part of the indexing shaft. A work supporting device for supporting an object includes a work supporting device base mounted on the table or the pallet, and a work supporting device base provided on the work supporting device base in a first direction parallel to the axis of the indexing shaft. A movable body that is movable and a movable body that is movable in a second direction orthogonal to the first direction;
A pair of sandwiching members arranged to sandwich the outer peripheral portion of the workpiece and facing each other, and a sandwiching member for moving the pair of sandwiching members forward and backward to a position for sandwiching the workpiece and a position for releasing the sandwiched state. And driving means. For example, the workpiece is attached to a work holder having a taper shank formed on one end side thereof, and the indexing shaft of the indexing device is detachably attached to the taper shank of the work holder. It is preferable to have a work mounting portion. The work support device has an axis parallel to the axial direction of the indexing shaft at a support position capable of supporting the work and a retracted position that is swung by a predetermined angle from the support position when exchanging the work. It is preferable that a swing member provided on the movable body is provided so as to be swingable about a center, and the pair of sandwiching members are provided on the swing member. The holding member driving means includes a first cylinder device having a large pressure receiving area for receiving a fluid pressure from a pressure fluid and a second cylinder device having a pressure receiving area smaller than that of the first cylinder device. The member includes a first holding member that moves forward and backward by being driven by the first cylinder device, and the second holding member.
Second clamping member that is driven by the cylinder device to move back and forth. The first cylinder device includes a second clamping member when the workpiece comes into contact with the first clamping member. A stopper for positioning the first holding member at a predetermined position is provided so that the center thereof coincides with the axis of the indexing shaft, and the second cylinder device includes:
It is preferable that the second clamping member is driven to press the workpiece against the first clamping member positioned by the stopper to center the workpiece. It is preferable that the sandwiching member driving means is capable of adjusting the sandwiching force for sandwiching the workpiece by the pair of sandwiching members into at least two kinds of sandwiching forces. Further, the holding member driving means,
It is preferable that the pair of clamping members can adjust the clamping force for clamping the workpiece to at least two types of clamping force according to a command output from a control device that controls the machine tool.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment according to the present invention will be described below with reference to FIGS. Figure 1
2 is a perspective view of the machine tool, FIG. 2 is a side view showing a part of the workpiece support device of the machine tool in section, and FIG. 3 is III-I of FIG.
A sectional view taken along line II and FIG. 4 are circuit diagrams for supplying a pressure fluid in the workpiece support device. FIG. 5 (A) is a schematic configuration diagram showing a state in which a workpiece is being processed, and FIG. 5 (B) is FIG.
It is a V line arrow view of (A).

As shown in FIGS. 1 to 5, in this embodiment, a machine tool is an MC (machining center) 1, but a tool 3 mounted on a spindle 2 (or a tool spindle) is rotated. A machine tool of another type such as a turning center may be used as long as it is a machine tool that processes the workpiece 4. The workpiece 4 to be machined by the MC 1 is, for example, a drill, and the tip 5 thereof is machined into a predetermined shape so that the chip 6 can be attached thereto, and the spiral groove 8 is machined in the outer peripheral portion 7. A drill as a work has its axis CL
It is elongated in two directions.

The MC 1 has a spindle head 10 provided with a spindle 2.
A machine body 11 having a tool, a tool magazine (not shown), an automatic tool changer (not shown) (hereinafter referred to as ATC), a work magazine 1 for storing a work 4
2. An automatic work changing device (hereinafter, referred to as AWC) 13 for automatically changing the work 4 is provided, an indexing device 14, a work supporting device 15, and the like. The MC 1 is controlled by a control device 18 having an NC (numerical control) device 16. The bed 20 of the MC 1 constitutes the machine body of the machine body 11 and is installed on the floor surface. Spindle head 1 of machine body 11
0 rotatably supports a main shaft 2 having an axis line CL1 in a substantially horizontal direction. The direction parallel to the axis CL1 of the main shaft 2 is the Z-axis direction. The spindle head 10 and the workpiece 4 mounted on the indexing device 14 relatively move in the Z-axis direction and in the X-axis direction and the Y-axis direction (here, the vertical direction) orthogonal to the Z-axis direction. It is possible. A control device 18 having an NC device 16 for controlling the MC1 is arranged laterally of the bed 20. The processing area 21 of the MC 1 is covered with a splash guard 22, opening / closing covers 23 a, 23 b, etc. so that chips, cutting oil (coolant), etc. do not scatter to the outside of the processing area 21. The open / close cover 23b is in the open state when the work 4 is exchanged by the AWC 13, and is in the closed state at other times.

The tool magazine is attached to the machine body 11, is provided at a predetermined position outside the splash guard 22, and can store one or a plurality of tools 3. The ATC is capable of exchanging the tool 3 between the tool magazine and the spindle 2, and automatically exchanging the tool 3 with respect to the spindle 2 at the tool exchanging position and detachably mounting it.
The machine body 11 has a column 24, a spindle head 10, a table 25, a saddle (not shown) on which the table 25 is clamped, and the like. Column 24 is almost horizontal Z
The bed 20 is provided so as to be movable in the axial direction by a Z-axis servomotor 28, a ball screw, and the like. Spindle head 10
Is provided on the column 24 so as to be movable in a substantially vertical Y-axis direction by a Y-axis servo motor 27, a ball screw, or the like. The table 25 clamped to the saddle is Z
The bed 20 is movable by an X-axis servo motor 26, a ball screw, etc. in the X-axis direction orthogonal to both the Y-axis and Y-axis directions
It is provided in.

The spindle 2 is rotationally driven by a spindle motor provided on the spindle head 10. At the front end of the spindle 2, A
A tool mounting portion is provided to which the tool 3 that is automatically replaced by the TC is removably mounted. The spindle 2 is provided with a tool clamp / unclamp mechanism for detachably mounting the tool 3 on the tool mounting portion. The tool 3 is clamped / unclamped on the spindle 2 by the tool clamp / unclamp mechanism.

By driving a table indexing motor (for example, a B-axis servomotor) 25a, the table 25 is swung in the direction of the B-axis (the axis of the swivel motion around the Y1 axis parallel to the Y-axis). The workpiece 4 on the table 25 can be indexed to a predetermined position by rotating in the B-axis direction. The table 25 is clamped / unclamped on the saddle via a coupling by a table clamp / unclamp mechanism. The table 25 whose coupling is disengaged by the table clamp / unclamp mechanism is a table indexing motor 25a,
It swings using a worm / worm wheel mechanism. The table 25 that has swung to a predetermined position is clamped to the saddle via the coupling by the table clamp / unclamp mechanism. At this time, since the coupling is engaged, the table 25 is accurately positioned with respect to the saddle. The table 25 is provided with the indexing device 14. The indexing device base 30 of the indexing device 14 is attached to the table 25, and the indexing shaft 31 of the indexing device 14 is rotatably indexed to the indexing device base 30. One end of the workpiece 4 is detachably attached to the portion 32. The indexing device 14 may be attached to a pallet on the table 25, and in this case, the indexing device base 30 is attached to the pallet.

The workpiece 4 has a taper shank 33 on one end side.
It is attached to the work holder 34 in which is formed. The taper shank 33 of the work holder 34 is detachably mounted on the work mounting portion 32 provided on the indexing shaft 31. The work piece 4 is detachably fastened and fixed to the work holder 34 by a collet chuck that attaches a spring collet to the chuck body, inserts the work piece 4 into the inner circumference of the spring collet, and then rotates and clamps the tightening member. There is. It should be noted that the work piece 4 is attached to the work holder 34 by means other than the collet chuck, such as bolts.
It may be detachably fixed directly to.

An A-axis indexing motor (for example, A-axis servomotor) 14a is attached to the indexing device base 30. The indexing shaft 31 is the A-axis indexing motor 14
Driven by a, the rotary indexing operation is performed around the axis line CL3 of the indexing shaft 31. Between the indexing shaft 31 and the output shaft of the A-axis indexing motor 14a, the output of the A-axis indexing motor 14a such as a worm / worm wheel mechanism or a roller gear cam mechanism is decelerated to the indexing shaft 31. A transmission mechanism is provided, and this transmission mechanism positions the indexing shaft 31 at a predetermined position. Further, indexing shaft fixing means such as a brake mechanism for fixing / unfixing the indexing shaft 31 positioned at a predetermined position may be provided. For example, the fluid having a predetermined pressure may be supplied to bring the indexing shaft fixing means such as a brake mechanism into a fixed state or an unfixed state to fix and release the indexing shaft 31. The indexing shaft 31 is provided with a work clamp / unclamp mechanism (not shown) for detachably mounting the taper shank 33 arranged on one end side of the workpiece 4 to the work mounting portion 32. This work clamp
The unclamp mechanism clamps and unclamps the work holder 34 to which the workpiece 4 is fastened and fixed to the indexing shaft 31.

The workpiece support device 15 is provided on the MC 1 and has a function of supporting the outer peripheral portion 7 near the tip portion 5 of the workpiece 4 and the outer peripheral portion 7 other than the tip portion 5. The workpiece support device base 40 of the workpiece support device 15 is the table 2
5 is attached. When the pallet is clamped / unclamped on the table 25, the workpiece support device base 40 may be attached to the pallet. The table 25 can be swivel-indexed in the B-axis direction and the indexing shaft 31 can be swivel-indexed in the A-axis direction.

As described above, the spindle head 10 has the Z-axis direction and the Y-axis direction.
The table 25 is movable in the axial direction, and the table 25 is movable in the X-axis direction. As a result, the spindle head 10 and the table 25 are
It is relatively movable in three orthogonal directions including the X-axis direction, the Y-axis direction, and the Z-axis direction. Therefore, the tool 3 is attached to the spindle 2.
Is mounted, the taper shank 33 on one end side of the workpiece 4 is mounted on the workpiece mounting portion 32, and the workpiece 4 is supported by the workpiece support device 15, and the workpiece on the tool 3 and the table 25 is 4 is orthogonal 3 axis direction and A axis,
The workpiece 4 is cut by the tool 3 by performing a relative movement operation or a rotation indexing operation in the B-axis direction.

Next, the work support device 15 will be described. The work supporting device 15 includes a work supporting device base 40,
A moving body 41, a pair of holding members 42 and 43, a holding member driving means 44, and the like are provided. Work support device base 4
0 is arranged on the table 25 so as to face the indexing device base 30. In addition, the workpiece supporting device base 40 and the indexing device base 30 are integrally formed on the table 25 (or
It may be provided on the pallet). Moving body 41
Is provided on the workpiece support device base 40, and the indexing shaft 31
It is movable in the first direction (U-axis direction) parallel to the axis line CL3. The pair of clamping members 42, 43 are provided on the movable body 41 so as to be movable in a second direction (V-axis direction) orthogonal to the U-axis direction, and can clamp or clamp the outer peripheral portion 7 of the workpiece 4 with respect to each other. It is arranged facing each other. The clamping member driving means 44 is provided at a position for clamping or clamping the workpiece 4 and a position for releasing (unclamping) the clamped state.
It has a function of moving the holding members 42, 43 forward and backward along the axis CL5.

The moving body 41 has a moving body main body 50 which is arranged on the workpiece supporting device base 40 and moves in the U-axis direction. The moving body 41 is provided with a swinging member 45, and the swinging member 45 is mounted on the moving body 5 via a bearing 55.
It is swingably supported at 0. The movable body 41 is provided with a rotary joint 56 for supplying a pressure fluid from the fixed side member 56a to the swing side member 56b (that is, to the swing member 45 side). The swinging member 45 has a supporting position E1 capable of supporting the workpiece 4 and a retracted position E2 swinging from the supporting position E1 by a predetermined angle θ when the workpiece 4 is replaced.
In addition, it is swingable as shown by an arrow G about an axis CL4 parallel to the axis CL3 direction of the indexing shaft 31.
When the rocking member 45 rocks, it also rocks in the V-axis direction about the axis CL4. A pair of clamping members 42, 4
3 is provided on the swinging member 45. Since the swinging member 45 retracts to the retracted position E2 when the work 4 is replaced,
The work supporting device 15 does not interfere with the replacement of the work 4. The work support device 15 is used when the work 4 is replaced.
When it does not interfere with the above, the holding members 42 and 43 may not swing.

A U-axis ball screw screw shaft 46 is attached to the movable body 50 in the non-rotating state in the U-axis direction. A nut 47 attached to the workpiece supporting device base 40 is screwed into the screw shaft 46. A U-axis servomotor 48 as a feed motor for moving the movable body 41 in the U-axis direction is attached to the workpiece support device base 40. The nut 47 is a toothed pulley 49,
It is rotationally driven in the forward and reverse directions by the U-axis servomotor 48 via another toothed pulley and toothed belt (not shown). The nut 4 is driven by the U-axis servo motor 48.
When 7 rotates, moving body 4 with screw shaft 46 fixed
1 is guided and supported by a guide portion (not shown) and reciprocates in the U-axis direction. This moving operation of the moving body 41 causes the workpiece 4 to move.
The work support device 15 moves in the U-axis direction with respect to.
The guide portion is composed of a flat type slide guide, but may be a slide guide of another shape, a rolling guide, a linear motion rolling guide, or the like.

A rack 51 is arranged on the movable body 50 so as to extend in a substantially horizontal third direction (W-axis direction) orthogonal to the U-axis direction. The rack 51 is driven by a fluid pressure cylinder device 52 provided in the movable body 50 so as to be movable in the W axis direction. The rack 51 includes a pinion 53 provided on a shaft portion 45 a fixed to the swing member 45.
Mesh with each other to form a rack and pinion mechanism 54. When the rack 51 moves in the W axis direction by switching and controlling the pressure fluid supplied to the fluid pressure cylinder device 52, the pinion 53 rotates in the forward and reverse directions. As a result, the swing member 45 swings about the axis CL4 as shown by the arrow G. In addition, the swing member 45 is not
It may have a rocking member positioning means for positioning when it is rocked to the 1 side by inserting a positioning pin or engaging a positioning coupling.
Further, the means for oscillating the oscillating member 45 may be one that converts the rotational operation of the oscillating actuator or the drive motor into an oscillating operation using a screw mechanism, a gear mechanism, or the like.

The holding member driving means 44 includes a first cylinder device 60 having a large pressure receiving area S1 for receiving a fluid pressure from a pressure fluid and a second cylinder device 61 having a pressure receiving area S2 smaller than that of the first cylinder device 60. Have As an example, the pressure receiving area S1 on one side is approximately twice the pressure receiving area S2 on the other side. The pair of holding members 42, 43 are driven by the first cylinder device 60 to move forward and backward in the V-axis direction, and the pair of holding members 42, 43 are driven by the second cylinder device 61 to move forward and backward in the V-axis direction. The second pinching member 43 is configured to move toward and away from each other at substantially the same time (or with a time lag).

The first holding member 42 and the second holding member 43
Each have a partially cylindrical inner peripheral surface 62 so as to surely contact the cylindrical outer peripheral portion 7 of the workpiece 4. When the first clamping member 42 and the second clamping member 43 clamp the workpiece 4, the center positions of the opposing inner peripheral surfaces 62, 62 coincide with the center of the workpiece 4. The first cylinder device 60 is provided with the first clamping member 42 so that the center of the workpiece 4 coincides with the axis CL3 of the indexing shaft 31 when the workpiece 4 comes into contact with the first clamping member 42. A stopper 63 for positioning at a predetermined position is provided. The second cylinder device 61 drives the second holding member 43 to press the workpiece 4 against the first holding member 42 positioned by the stopper 63 to center the workpiece 4. The sandwiching member driving means 44 includes a pair of sandwiching members 42, 4
3 holds the workpiece 4 (including the case of clamping).
The holding force (including the case of the clamping force) for adjusting the holding force can be adjusted to at least two types of holding force. That is,
The two types of clamping force are a pair of clamping members such that the center of the other end of the workpiece 4 whose one end is mounted on the work mounting portion 32 of the indexing shaft 31 matches the axis CL3 of the indexing shaft 31. Four
A first force (strong force) for sandwiching between 2, 43 and forcibly centering, and a pair of sandwiching members 42, 43 which are weaker than the first force and maintain a sandwiched state with respect to the workpiece 4. On the other hand, it is a second force (weak force) that causes almost no adverse effect on the outer peripheral surface of the workpiece 4 even if the holding members 42, 43 and the workpiece 4 are moved relative to each other. Holding member drive means 44 of the present embodiment
Is capable of adjusting the holding force for holding the workpiece 4 by the pair of holding members 42 and 43 to at least two types (here, four types) of holding force according to a command output from the control device 18. .

In the first cylinder device 60, the clamp side chamber 65 and the unclamp side chamber 66 are provided by the first piston 64.
It is divided into The second cylinder device 61 is also partitioned by the second piston 67 into a clamp side chamber 68 and an unclamp side chamber 69. First piston 64 and second
The piston 67 is provided with rotation stoppers 71 and 72 attached to the swing member 45 to prevent rotation thereof around the axis CL5, and reciprocates in the V-axis direction along the axis CL5. It is movable. The first holding member 42 is attached to the tip of the first piston 64.
Is detachably attached, and the second holding member 43 is detachably attached to the tip end portion of the second piston 67.
The first clamping member 42 and the second clamping member 43 are provided on the workpiece 4
It can be replaced with a sandwiching member having an inner peripheral surface 62 having a diameter substantially the same as that of the outer peripheral portion 7.

A hydraulic fluid as a pressure fluid is supplied to the clamp side chambers 65 and 68 by a pressure fluid supply device 70,
Further, the unclamping side chambers 66, 69 are also supplied with the hydraulic fluid whose supply direction is switched by the pressure fluid supply device 70. The clamp side chambers 65 and 68 are connected to the pressure fluid supply device 70 through the rotary joint 56 from the clamp side flow passage 73 formed in the swing member 45. The unclamp chambers 66, 69 are also connected to the pressure fluid supply device 70 via the unclamp channel 74 formed in the swing member 45 and the rotary joint 56. The swing member 45 includes the workpiece 4 and the holding member 4.
A nozzle 75 having a nozzle opening is attached to the contact position with the nozzles 2, 43. If compressed air for cleaning is supplied from the rotary joint 56 to the nozzle 75 by flowing through the air passage 76 formed in the swinging member 45, the compressed air is ejected from the nozzle 75, so that the contact position It is possible to prevent chips from entering. A flexible pipe may be provided outside the rocking member 45 as a means for communicating the rotary joint 56 to the clamp side flow path 73, the unclamp side flow path 74, and the air flow path 76. A communication passage may be provided inside the moving member 45.

A rear rod portion 80 is formed on the rear side (upper side in FIG. 3) of the first piston 64. A stopper 63 is detachably screwed and attached to the tip of the rear rod portion 80. The angle position of the stopper 63 screwed into the rear rod portion 80 is adjusted, and the bolt 81 screwed into the center portion of the stopper 63 is brought into contact with the rear rod portion 80 to make a gap between the screw portions, thereby forming the rear rod portion 80. The relative position of the stopper 63 in the V-axis direction can be adjusted. After this adjustment, the stopper 63
The stopper 63 is fixed to the rear rod portion 80 by the fixing screw 82 screwed in the horizontal direction.
The end surface 83 of the stopper 63 can come into contact with and separate from the end surface 84 of the swing member 45. By contacting the end surface 83 of the stopper 63 with the end surface 84 of the swinging member 45, the first holding member 42 can be positioned at a predetermined position via the stopper 63, the rear rod portion 80, and the first piston 64. it can.

Clamping side chamber 6 of the first cylinder device 60
When hydraulic oil is supplied to 5 and driven, the first clamping member 42 is positioned by the action of the stopper 63 at the position where the center of the workpiece 4 coincides with the axis CL3 of the indexing shaft 31. Then, the clamp side chamber 6 of the second cylinder device 61
8 to supply the hydraulic oil, and the second cylinder device 61
When driven simultaneously with the cylinder device 60 (or with a time lag), the second holding member 43 presses the workpiece 4 against the first holding member 42. At this time, since the pressure receiving area S1 of the first cylinder device 60 is larger than the pressure receiving area S2 of the second cylinder device 61,
The force with which the first piston 64 presses the workpiece 4 is larger than the force with which the second piston 67 presses the workpiece 4.
As a result, the workpiece 4 maintains the center thereof aligned with the axis line CL3 of the indexing shaft 31, and the first holding member 42.
And is clamped by the second clamping member 43. In this way, the workpiece 4 is forcibly centered. The holding member driving means 44 may be another driving means as long as it can adjust the holding force of the holding members 42, 43. For example,
The output of the torque controllable drive motor may be converted by a screw mechanism, a gear mechanism, or the like to drive the holding members 42, 43.

The controller 18 of the MC1 is the NC device 16
And a PLC (programmable logic controller) connected to the NC device 16 via an interface
It consists of 17. The NC device 16 includes an X-axis servo motor 26, a Y-axis servo motor 27, a Z-axis servo motor 28, an A-axis servo motor 14a, a B-axis servo motor (table indexing motor) 25a, and a U-axis. The servo motor 48 is moved and the positioning is controlled. The servo motor for each axis may be another control motor, a linear motor, or the like. The PLC 17 is for performing sequence control of various devices based on a command or the like from the NC device 16 by input / output signals to / from the various devices. In addition, PL
C17 may be a PLC unit provided in the NC device 16.

The pressure fluid supply device 70 is controlled by the control device 18. The flow path of the pressure fluid supply device 70 is connected to a hydraulic oil supply source P for supplying hydraulic oil and a tank T,
It is designed to supply hydraulic oil. A proportional electromagnetic pressure reducing valve (hereinafter referred to as a pressure reducing valve) 91 is provided in the P-side passage and the T-side passage.
, Electromagnetic switching valve 92, and clamp pressure switch 9
3 and the unclamp pressure switch 94 are connected. The pressure reducing valve 91 reduces the pressure (fluid pressure) of the hydraulic oil supplied from the hydraulic oil supply source P under the control of the proportional valve control means (proportional valve controller) 95. The switching valve 92 is
By switching the supply direction of the hydraulic oil supplied to the first cylinder device 60 and the second cylinder device 61, the workpiece 4 is clamped / unclamped or clamped / unclamped. In the clamp pressure switch 93, the workpiece 4 is the workpiece supporting device 1
The pinching or clamping by 5 is detected when the pressure of the hydraulic oil in the clamp side flow path 73 reaches a predetermined pressure, and a signal is output. Unclamp pressure switch 94
Detects that the workpiece 4 is in the unclamping state or the unclamping state, when the pressure of the hydraulic oil in the unclamping side passage 74 reaches a predetermined pressure, and outputs a signal.

The PLC 17 sends a signal to the switching valve 92 to control the switching of the hydraulic oil supply direction. The clamp pressure switch 93 outputs a signal to the PLC 17 when the pressure of the hydraulic oil on the clamp side flow path 73 side becomes larger than a set value. The unclamp pressure switch 94 is
When the pressure of the hydraulic oil on the unclamp side flow path 74 side becomes larger than the set value, a signal is output to the PLC 17. As a result, it can be known whether the workpiece 4 has been clamped or clamped by the first clamping member 42 and the second clamping member 43 or has been unclamped.

The pressure reducing valve 91 is controlled by the proportional valve control means 95 to reduce the pressure of the hydraulic oil in the clamp side flow passage 73 or the unclamp side flow passage 74. Setting means 96
Is a controller having, for example, a 4-channel setting unit, and outputs a command to the proportional valve control means 95 by a signal from the PLC 17. The setting means 96 can set a plurality of (here, four) set pressures P1, P2, P3, P4 to be reduced, and each set pressure P1 to P4 is set by a dial or digital switch of the setting means 96. You can change the setting value for each. For example, the first set pressure P1 is the largest value, and the second set pressure P2, the third set pressure P3, and the fourth set pressure P4 are gradually smaller in this order. The four set pressures P1 to P4 are set values suitable for machining the workpiece 4, and the automatic mode and M
It can be selected by a command (for example, M code) of a program instructed from a DI (manual data input) operation mode or the like. The signal according to this selected command is PLC1.
It is input to the setting means 96 via 7 and set pressures P1 to P4
Is selected. The proportional valve control means 95 controls the pressure reducing valve 91 so that it becomes a pressure selected from the set pressures set by the setting means 96, so that the hydraulic oil of a desired pressure is first
Is supplied to the cylinder device 60 and the second cylinder device 61.

Next, a procedure for processing the workpiece 4 will be described. FIG. 6 is a flowchart showing a procedure for processing the workpiece 4. As shown in FIGS. 1 to 6, the workpiece 4
On the other hand, a case where the processing of the tip portion 5 and the processing of forming the spiral groove 8 on the outer peripheral portion 7 are performed will be described as an example.
The desired tool 3 is attached to the spindle 2 by ATC,
It is assumed that the work piece 4 is not attached to the indexing device 14. The NC program of the procedure for machining the workpiece 4 is NC
Pre-stored in the NC program memory of device 16. The NC device 16 calls a necessary NC program from the NC program memory and executes it to control the machining operation of the MC 1.

When starting the cutting work, first of all,
The work support device 15 is retracted to the retracted position E2 (step 101). That is, the U-axis servo motor 48 is driven to move the moving body 41 in the U-axis direction away from the indexing device 14 via the screw shaft 46 of the U-axis ball screw and the nut 47. On the other hand, the fluid pressure cylinder device 52
Is driven to swing the swinging member 45 from the support position E1 to the retracted position E2 through the rack and pinion mechanism 54 as shown by an arrow G. This secures a space for supplying the workpiece 4 to the processing position. Clamping members 42, 4
The switching valve 92 is switched so that 3 is moved to the unclamp position in the V-axis direction. Next, the open / close cover 23b is opened by a cylinder (not shown), and the AWC 13 is driven to move the unprocessed workpiece 4 from the work magazine 12 to the indexing device 14. That is, the work holder 34 to which the unprocessed workpiece 4 is fastened and fixed is moved by the twin arm 13a in the work magazine 12 to the indexing device 14 side. Then, with the AWC 13, the taper shank 33 of the work holder 34 that fastens and fixes the unprocessed workpiece 4 is mounted on the work mounting portion 32 of the indexing shaft 31. The taper shank 33 is clamped by the work clamp / unclamp mechanism. As a result, the workpiece 4 is mounted on the indexing device 14 (step 102). The twin arm 13a moves to the tool magazine 12 side and closes the open / close cover 23b. If multiple workpieces 4
In the case of continuously machining the workpieces, the work holder 34 of the next unmachined workpiece 4 is mounted on the twin arm 1 on the AWC 13 side.
3a grips and waits at the standby position.

Then, the work supporting device 15 is supported at the supporting position E.
Swing to 1 (step 103). That is, the fluid pressure cylinder device 52 is driven to swing the swing member 45 from the retracted position E2 to the support position E1. At this time, since the first holding member 42 and the second holding member 43 are retracted away from each other, they do not interfere with the workpiece 4. Next, the work support device 15 (that is, the moving body 41) is moved to a desired support position in the U-axis direction (step 104). The desired supporting position is a position in the U-axis direction corresponding to the tip 5 of the workpiece 4. The indexing device 14 is turned to a desired angular position (position in the A-axis direction). Next, the pressure (for example, the first set pressure P1) of the hydraulic oil supplied to the first cylinder device 60 and the second cylinder device 61 is selected (step 105). The first set pressure P1 corresponds to the first force (strong force), and can make the center of the workpiece 4 coincide with the axis line CL3 of the indexing shaft 31.

When a command for selecting the first set pressure P1 is issued, the setting means 9 is generated by the signal output from the PLC 17.
6 outputs a signal corresponding to the first set pressure P1 to the proportional valve control means 95, and the proportional valve control means 95 controls the pressure reducing valve 91. When controlled to the first set pressure P1, the solenoid of the switching valve 92 is excited to switch the supply direction of hydraulic oil. Accordingly, the clamp side chamber 65 of the first cylinder device 60 and the clamp side chamber 68 of the second cylinder device 61.
Is supplied with the hydraulic oil having the first set pressure P1. Therefore, the first clamping member 42 positioned by the stopper 63 and the second clamping member 43 facing the first clamping member 42 position the workpiece 4 so that the center of the workpiece 4 coincides with the axis CL3 of the indexing shaft 31. It is forcibly centered and clamped (step 106). As a result, the tip portion 5 is machined with high precision by the tool 3 in a state where the outer peripheral portion 7 of the workpiece 4 near the tip portion 5 is clamped by the workpiece support device 15 with a large clamping force (step 107). . In addition, the workpiece 4
On the other hand, when machining the tip portion 5 at another angular position different from the above-mentioned angular position, the solenoid of the switching valve 92 is demagnetized to the first cylinder device 60 and the second cylinder device 61. After switching the supply direction of the hydraulic oil to bring the first holding member 42 and the second holding member 43 into the unclamped state, the indexing device 14 is turned to another desired angular position. After that, the solenoid of the switching valve 92 is excited to switch the supply direction of the hydraulic oil, the forced centering and the clamping operation of step 106 are performed, and the tip portion 5 is machined in the clamped state of step 107.

When the processing of the tip portion 5 is completed, the spiral groove 8 is formed.
Move to processing. Therefore, the other pressure of the hydraulic oil (for example, the third set pressure P3) is selected by the signal output from the PLC 17 (step 108). The third set pressure P3 corresponds to the second force (weak force), and the holding members 42, 43 and the workpiece 4 are moved relatively with the pair of holding members 42, 43 maintaining the holding state. Is a force that causes almost no adverse effects on the outer peripheral surface of the workpiece 4.
The third set pressure P3 is, for example, about half of the first set pressure P1. When a command to select the third set pressure P3 is issued, the proportional valve control means 95 controls the pressure reducing valve 91 based on the signal output from the setting means 96. This allows
The hydraulic fluid having the third set pressure P3 is supplied to the clamp side chamber 65 of the first cylinder device 60 and the clamp side chamber 68 of the second cylinder device 61, so that the outer peripheral portion 7 of the workpiece 4 becomes a workpiece support device. It is clamped by 15 with a weak clamping force.

Then, the indexing motor 14a is driven and controlled to move the workpiece 4 around the axis CL3 (that is, A
An indexing operation of rotating at a predetermined rotational speed (in the axial direction),
The X-axis servo motor 26 is driven and controlled, and the table 25
To move the workpiece 4 relative to the spindle 2 in the X-axis direction in synchronization with the predetermined spiral groove 8
Is processed. At this time, the movement operation of the moving body 41 in the U-axis direction with respect to the table 25 is the same as that of the moving direction of the table 25 in the opposite direction of the moving direction of the table 25 in the X-axis direction. Are moved so that they do not move relative to each other. As a result, the outer peripheral portion 7 of the workpiece 4
The spiral groove 8 is machined in the outer peripheral portion 7 while steadying the vicinity of the machining point (step 109). During this process,
The first clamping member 42 and the second clamping member 43 are provided on the workpiece 4
While being clamped by a weak clamping force, it slides on the outer peripheral portion 7 and moves in the U-axis direction. While the spiral groove 8 is being machined, the first clamping member 42 and the second clamping member 43 are always sandwiching and supporting the positions in the immediate vicinity of the machining point from both sides. Even with No. 4, in the centered state, machining is performed with high accuracy without causing chattering (vibration of the cutting edge) during machining.

When the processing of the spiral groove 8 is completed, the PLC 1
The switching valve 92 switches the flow direction of the hydraulic oil by the signal of 7. Then, the first holding member 42 and the second holding member 43
Moves away from the workpiece 4 in the V-axis direction. Then, the work support device 15 is moved to the retracted position in the U-axis direction and is swung to the retracted position E2 (step 1).
10). That is, the movable body 41 is moved in the U-axis direction to be retracted, and the swinging member 45 is swung from the support position E1 to the retracted position E2. As a result, the work supporting device 15 is separated from the work 4. In the next step 111, it is judged whether or not a desired number of processed pieces has been processed. When the desired number of processing is completed, step 1
12, after opening and closing the open / close cover 23b, A
The WC 13 is driven to disengage the work holder 34 of the machined work 4 from the indexing device 14, and the machined work 4 is carried out and stored in the work magazine 12. Then, the open / close cover 23b is closed. In this way, the processing of the workpiece 4 is completed.

If it is determined in step 111 that the desired number of workpieces 4 have not been machined, the process proceeds to step 113 and the workpiece holder 3 of the unmachined workpiece 4 is processed.
4 to the indexing device 13 and the indexing device 1
The processed workpiece 4 of 3 is carried out, and the processed workpiece 4
And the unprocessed workpiece 4 are replaced. In this case, the open / close cover 23b is opened. After the twin arm 13a of the AWC 13 is moved to the indexing device 13 side and the work holder 34 of the machined workpiece 4 is gripped, the work clamp / unclamp mechanism is unclamped and removed. Then, the twin arm 13a is rotated 180 degrees to mount the work holder 34 of the unprocessed workpiece 4 on the work mounting portion 32. Then, the work clamp / unclamp mechanism is brought into a clamped state. The twin arm 13a is moved to the work magazine 12 side, and the opening / closing cover 23b is also used.
Is closed. The MC1 side proceeds to step 103 to continue machining the workpiece 4. The AWC 13 side returns the work holder 34 of the machined workpiece 4 to the work magazine 12, grips the work holder 34 of the unmachined workpiece 4, returns to the standby position, and stands by.

According to the above-mentioned procedure, one MC1 is used to center the workpiece 4, process the workpiece 4 by clamping or clamping it, and loosen the clamping force to prevent the workpiece 4 from swinging. Each operation such as only the indexing operation or the machining in which the indexing operation and the movement of the workpiece 4 in the axial direction are synchronized can be continuously performed. As described above, it is preferable to process the spiral groove 8 after processing the tip portion 5 because there is no waste in the processing operation of the MC 1 and the clamping operation of the workpiece support device 15. Although the example in which the tip portion 5 and the spiral groove 8 are machined on the workpiece 4 has been described, various kinds of machining such as machining only one or machining in the reverse procedure can be freely combined. The work support device 15 has a strong force (for example, 1,471 to 1,961 N (for example, when machining the tip 5) during the centering operation and when machining the workpiece in a fixed state (for example, when machining the tip 5). 150-200kg
The work piece 4 is clamped by f)). This clamping force varies depending on the type, diameter, length, etc. of the workpiece 4. Also,
When the spiral groove 8 is machined with the outer peripheral portion 7 held steady, a weak clamping force of about half the strong clamping force is applied to the workpiece 4.
To pinch. This clamping force is preferably a force that does not cause chattering during outer periphery machining, and is preferably a force that does not cause a harmful effect on the workpiece 4 due to a frictional force when rotating or moving.

According to the present invention, the workpiece 4 with respect to MC1
Supply, carry-out, centering of the workpiece 4, machining by clamping or clamping the workpiece 4 (for example, machining of the tip 5 of the workpiece), machining with steady rest (for example, groove of outer peripheral portion 7) Processing 4) can be performed continuously, so work 4
The processing accuracy of MC1 is improved, and automatic operation of MC1 is possible.
Further, even a workpiece having a small diameter and a long axial dimension can be accurately processed without causing chattering. Since the workpiece support device 15 has a centering function and a steady rest function, it is not necessary to separately provide a device for these functions, and space is saved. As in the previous embodiment, the workpiece 4 has the taper shank 3 on one end side.
The workpiece support device 15 of the present invention is particularly effective when it is fixed to the work holder 34 provided with 3 and can be automatically exchanged by the AWC 13, and when the tip portion 5 and the outer peripheral portion 7 of the workpiece 4 are processed. . In the drawings, the same reference numerals indicate the same or corresponding parts.

[0040]

Since the present invention is configured as described above, centering of a workpiece, machining by clamping or clamping the workpiece with one machine tool, machining by stabilizing the workpiece, etc. It can be performed. Further, since the workpiece can be clamped and forcibly centered so that the center of the workpiece coincides with the center of the indexing shaft, high-precision machining can be performed.

[Brief description of drawings]

1 to 6 are views showing an example of an embodiment of the present invention, and FIG. 1 is a perspective view of a machine tool.

FIG. 2 is a side view showing a part of a workpiece support device of the machine tool in section.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a circuit diagram for supplying a pressure fluid in the work support device.

5 (A) is a schematic configuration diagram showing a state in which a workpiece is being processed, and FIG. 5 (B) is a view taken along the line V in FIG. 5 (A).

FIG. 6 is a flowchart showing a procedure for processing a workpiece.

[Explanation of symbols]

1 MC (machine tool) 4 work pieces 7 Outer periphery 14 Indexing device 15 Work support device 18 Control device 25 tables 30 Indexer base 31 Indexing axis 32 Work mounting part 33 taper shank 34 Work holder 40 Work support device base 41 Mobile 42 First Clamping Member (Clamping Member) 43 Second Clamping Member (Clamping Member) 44 Clamping member driving means 45 Swing member 60 First cylinder device 61 Second Cylinder Device 63 stopper CL3 Indexing axis line CL4 axis E1 support position E2 retracted position S1, S2 pressure receiving area U-axis direction First direction V-axis direction Second direction θ predetermined angle

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3C016 CA05 CB06 CC01 CE02                 3C045 BA40 FD10                 3C048 AA01 DD06 DD11 EE06

Claims (6)

[Claims] 1. An indexing device base is attached to a table or a pallet on the table, and an indexing shaft of the indexing device is rotatably indexed to the indexing device base.
In a machine tool in which one end side of a workpiece is removably mounted on a work mounting portion of the indexing shaft, a workpiece support device provided on the machine tool for supporting the workpiece is mounted on the table or the pallet. A workpiece support device base body, a movable body provided on the workpiece support device base body and movable in a first direction parallel to the axis of the indexing shaft, and a second body orthogonal to the first direction. A pair of sandwiching members provided on the movable body so as to be movable in a direction, sandwiching the outer peripheral portion of the workpiece, and facing each other; and a position for sandwiching the workpiece and a position for releasing the sandwiched state. A work support device for a machine tool, comprising: a holding member driving means for moving a pair of holding members forward and backward. 2. The work supporting device for a machine tool according to claim 1, wherein the work is attached to a work holder having a taper shank formed at one end thereof, and the work of the indexing device is performed. The work support device for a machine tool, wherein the indexing shaft has the work mounting portion to which the taper shank of the work holder is detachably mounted. 3. The workpiece support device for a machine tool according to claim 1, wherein the support position capable of supporting the workpiece and a predetermined angle swing from the support position when exchanging the workpiece. In the retracted position, a swing member provided on the moving body is provided so as to be swingable about an axis parallel to the axial direction of the indexing shaft, and the pair of holding members are provided on the swing member. A workpiece support device for a machine tool, which is characterized by being provided. 4. A work supporting device for a machine tool according to claim 1, 2, or 3, wherein the holding member driving means has a first cylinder device having a large pressure receiving area for receiving a fluid pressure from a pressure fluid. A second cylinder device having a pressure receiving area smaller than that of the first cylinder device, wherein the pair of clamping members is a first clamping member which is driven by the first cylinder device to move back and forth; And a second clamping member that moves forward and backward by being driven by a second cylinder device, wherein the first cylinder device includes the work when the workpiece comes into contact with the first clamping member. A stopper for positioning the first holding member at a predetermined position is provided so that the center of the object coincides with the axis of the indexing shaft, and the second cylinder device includes the second holding member. Drive the The workpieces are pressed and performs centering of the workpiece machine the workpiece support device in the first holding member which is positioned by. 5. The workpiece support device for a machine tool according to claim 1, wherein the holding member driving means holds the workpiece by the pair of holding members. A workpiece support device for a machine tool, wherein the clamping force can be adjusted to at least two types of clamping force. 6. The workpiece support device for a machine tool according to claim 1, wherein the holding member drive means is controlled by a command output from a control device that controls the machine tool. A workpiece supporting device for a machine tool, wherein the pair of clamping members can adjust a clamping force for clamping the workpiece into at least two kinds of clamping forces.