JP2011031339A - Workpiece supporting apparatus for machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece supporting apparatus for machine tool, capable of attaining more size reduction of a machine tool without degrading processing precision. <P>SOLUTION: The workpiece supporting apparatuses L, R support each of both ends or proximity of both the ends of a substantially cylindrical workpiece W with supporting means LC, LR and is structured so that the workpiece W is rotatable around a reference axis STZ passing through the center of the supporting position. The workpiece supporting devices L, R are mounted in a pair and at least one of the workpiece supporting devices L, R is reciprocatable in a reference axis STZ direction along a plurality of guides LG, and the plurality of guides LG are mounted along the reference axis STZ direction on each of two faces (MV, MH) provided to be parallel to the reference axis STZ and orthogonal to each other. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a workpiece support device that supports a workpiece in a machine tool.

Conventionally, for example, as a machine tool for grinding a cylindrical workpiece, a workpiece is supported from both ends by a spindle device having a spindle that is rotationally driven and a tailstock device that is not rotationally driven but has a rotatable center. A machine tool is known in which the end of the workpiece is connected by a drive fitting, and the workpiece is rotated by rotating the drive fitting and the spindle integrally.
Also known as a machine tool that grinds a workpiece that cannot use a drive bracket, presses and supports the workpiece from both ends with a pair of synchronously rotating support devices, and rotates the workpiece without using a drive bracket. It has been. In this case, each of the support devices includes a spindle stock placed on the base of the machine tool and a spindle that can reciprocate in the longitudinal direction of the workpiece on the spindle stock.

For example, the prior art described in Patent Document 1 discloses a grinding machine that performs processing with a workpiece supported by a pair of synchronously rotating workpiece support driving devices placed on a bed of a machine tool. Each of the work support drive devices is provided with a left main spindle and a right main spindle that are reciprocally movable in the longitudinal direction of the work according to the length of the work, respectively, on the left main spindle and the right main spindle mounted on the bed. Each of the left main shaft and the right main shaft is configured to be rotatable in synchronization.
Further, in the prior art described in Patent Documents 2 and 3, one of a pair of support devices that support a work is a main shaft that is rotationally driven, and the other is a tailstock shaft that is not rotationally driven but includes a rotatable center. In the constructed machine tool, a structure capable of adjusting the axial center position of the tailstock is disclosed. The tailstock has a so-called ram structure in which the distance between the support devices can be adjusted according to the length of the workpiece.

JP 2004-358589 A Japanese Patent Laid-Open No. 06-047604 JP-A-11-019806

A machine tool having a pair of support devices that rotate synchronously as in the prior art described in Patent Document 1, a drive motor for adjusting the distance between the spindles in accordance with the length of a workpiece on both support devices. And a drive mechanism, and a drive motor and a drive mechanism for synchronously rotating the main shaft, the pair of support devices are increased in size, and the machine tool is increased in size. In addition, a linear guide (linear roller guide) is provided on the headstock so that the distance between the main shafts can be adjusted, and the main shaft can be moved along the linear guides. However, the linear guide also has a minute error in the gap between the movable body and the fixed body. In a machine tool that requires high accuracy, a linear guide is used to reduce the linear guide error and improve the machining accuracy. Auxiliary mechanisms for reducing errors such as guides and ball splines are provided along the linear guides, and the support device is further enlarged.
Here, when machining a workpiece that is relatively small but cannot use a drive bracket, the above-mentioned synchronous rotary machine tool must be used, but a large machine tool is introduced for a small workpiece. Cost performance is not good.
In addition, the main shaft that is rotationally driven by both of the pair of support devices described in Patent Document 1 is not provided with a mechanism for adjusting the axial center position of the rotating shaft as described in Patent Documents 2 and 3. . In the case of the ram type structure, a relatively wide space is required to secure a space in the movable range of the ram, so that the tailstock device is enlarged and the machine tool is enlarged.
The present invention has been made in view of such points, and it is an object of the present invention to provide a workpiece support device in a machine tool that can further reduce the size of the machine tool without reducing machining accuracy. And

As means for solving the above-mentioned problems, a first invention of the present invention is a work support device for a machine tool as set forth in claim 1.
The work support device for a machine tool according to claim 1, wherein the work support in the machine tool is capable of supporting the both ends of the work at or near the both ends by support means and rotating the work around a reference axis passing through the center of the support location. It is a support device.
The work support device is provided in a pair, and at least one of the work support devices can reciprocate in the reference axis direction along a plurality of guides, and the plurality of guides are parallel to the reference shaft. Each of the two surfaces provided so as to be orthogonal to each other is provided along the reference axis direction.

A second invention of the present invention is a workpiece support device for a machine tool as set forth in claim 2.
The work support device for a machine tool according to claim 2 is the work support device for the machine tool according to claim 1, wherein the support means in at least one of the work support devices has one end of the work. It is a conical center member for supporting, and the center rotation shaft passing through the tip of the center member is set at a position eccentric with respect to the reference axis.
And it is possible to support and rotate the work with the center member in one work support device and the support means in the other work support device, and a position eccentric with respect to the reference axis. There is provided an eccentric position adjusting means capable of adjusting the position of the center rotation shaft along the circumferential direction of the reference shaft.

According to a third aspect of the present invention, there is provided a work support device for a machine tool as set forth in the third aspect.
The work support device for a machine tool according to claim 3 is the work support device for a machine tool according to claim 2, comprising drive means for rotating the center member about the center rotation axis, and the drive means. The rotation axis is set at a position eccentric with respect to the center rotation axis.
The drive means and the center member are connected to an eccentric shaft center via an axial direction conversion mechanism capable of transmitting rotational power.

According to a fourth aspect of the present invention, there is provided a workpiece support device for a machine tool according to the fourth aspect.
A workpiece support device for a machine tool according to claim 4 is the workpiece support device for a machine tool according to any one of claims 1 to 3, wherein the workpiece support device is a contact point between a tool for machining a workpiece and the workpiece. At least one of the plurality of guides is disposed on an extension of a perpendicular line drawn down to the reference axis.

A fifth aspect of the present invention is a work support device for a machine tool as set forth in the fifth aspect.
The workpiece support device for a machine tool according to claim 5 is a workpiece support device for a machine tool, in which a workpiece having an arbitrary shape is fixed and is movable relative to a tool for machining the workpiece.
The workpiece support device is movable relative to the tool along a plurality of guides at least in a direction perpendicular to a tool cutting direction in which the tool cuts into the workpiece. The guide is parallel to the cutting direction orthogonal line that is a line orthogonal to the tool cutting direction in the machine tool and is provided on each of the two surfaces provided to be orthogonal to each other. It is provided along the direction.

According to the work support device for a machine tool according to claim 1, in the conventional work support device shown in FIG. 4B, the linear guide LG for guiding the main shaft LS (or RS) is provided only on the vertical plane MV. However, in the present application shown in FIG. 4A, linear guides LG for guiding the main axis LS (or RS) are provided on both of two surfaces set at right angles (in this case, the vertical surface MV and the horizontal surface MH). ing.
As shown in FIG. 4C, for example, the error of a single linear guide LG is such that the error ΔEa is about 5 [μm] and the error ΔEb is about 5 [μm]. Here, when the linear guide LG is attached as in the conventional case shown in FIG. 4B, there is an error of ΔEa in the Z-axis direction (in this case, about 5 [μm]). In order to further reduce this error, it is necessary to add an auxiliary mechanism ES such as a ball spline to the horizontal plane MH (or the vertical plane MV), which increases the size of the machine tool.
However, when the linear guide LG is attached to each of the two surfaces set to be orthogonal as shown in FIG. 4A, the two orthogonal surfaces (in this case, the horizontal surface MH and the vertical surface MV) are ideal. Since there is a minute error with respect to the state, the error is automatically corrected by the mutual interference of the linear guide LG. For this reason, the error in the Z-axis direction and the error in the Y-axis direction are actually reduced. Thereby, since it is not necessary to add auxiliary mechanisms ES, such as a ball spline, a supporting device can be reduced in size, without reducing processing accuracy.

  Further, according to the work support device for a machine tool according to claim 2, the position of the center rotation axis HZ that is eccentric with respect to the reference axis STZ can be adjusted as shown in FIGS. 5 (A) and 5 (B). Convenient.

  According to the work support device for a machine tool according to claim 3, the rotational power of the drive means is appropriately applied to the center member even at a position where the rotation shaft of the drive means and the rotation shaft of the center member are eccentric. Can communicate.

  Further, according to the workpiece support device for a machine tool according to claim 4, even if a tool such as a grindstone is pressed against the workpiece, the pressing force can be appropriately received by the guide. The rigidity can be further improved.

  According to the work support device for a machine tool according to claim 5, an end mill or the like is used in addition to a grinder that grinds the work using a cylindrical grindstone while rotating the cylindrical work. Thus, the present invention can also be applied to a machine tool or the like (for example, a machining center) that performs processing by relatively moving the work held on the work table and the end mill.

It is a figure explaining the example of the top view (A) and side view (B) of one Embodiment of the machine tool 1 provided with the workpiece | work support apparatus (spindle apparatus L, R) in the machine tool of this invention. (Left) It is a figure explaining the example of a structure of the spindle apparatus L (work support apparatus). (Right) It is a figure explaining the example of a structure of the main axis | shaft apparatus R (work support apparatus). It is a figure explaining the attachment position of the linear guide LG in the spindle apparatus L and R (work support apparatus). It is a figure explaining the method etc. which adjust the position of the center rotating shaft HZ decentered with respect to the reference axis STZ.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. FIG. 1 (A) shows an example of a plan view of a machine tool 1 provided with a workpiece support device (spindle devices L, R) in a machine tool of the present invention, and FIG. 1 (B) shows the machine tool 1. An example of a right side view is shown. In FIG. 1B, (right) spindle device R (work support device) and the like are not shown.
Moreover, in all drawings in which the X axis, the Y axis, and the Z axis are described, the X axis, the Y axis, and the Z axis are orthogonal to each other, and the Y axis indicates a vertically upward direction. The X axis and the Z axis indicate the horizontal direction, and the Z axis indicates the direction in which the tool T cuts into the workpiece W.

● [Overall configuration of machine tool 1 (Fig. 1)]
As shown in FIGS. 1A and 1B, the machine tool 1 rotates around a reference axis STZ (in this case, (left) an axis in the X-axis direction passing through the center member LC of the spindle device L). The workpiece W is ground by relatively moving the substantially cylindrical grindstone T rotating around the grindstone rotation axis TZ parallel to the reference axis STZ with respect to the substantially cylindrical workpiece W. In addition, illustration is abbreviate | omitted about the control means (NC control apparatus etc.) which detects the position etc. of each movable body, and outputs a control signal to each drive motor.
The workpiece W includes a conical center member LC (corresponding to support means) (left) and a spindle device L (corresponding to a work support device), and a conical center member RC (corresponding to support means) ( Right) Both ends (or near both ends) are supported by the spindle device R (corresponding to the workpiece support device). In the present application, the center member is used as the pair of support means. However, at least one of the support means may be a chuck. In the case of a chuck, the reference axis STZ passes through the center of the portion where the workpiece W is supported by the chuck.
In addition, although the example of the grindstone T was shown as a processing tool in this Embodiment, cutting tools, such as a cutting tool, may be used and a processing tool is not specifically limited.

(Left) The spindle device L includes a (left) spindle stock LD mounted on the base BS, (left) a spindle housing LH that can reciprocate in the X-axis direction with respect to the spindle stock LD (left), (Left) A main shaft LS is supported in a main shaft housing LH so as to be rotatable about a reference axis STZ (left). In addition, a center member LC is provided at one end of the (left) main shaft LS.
(Left) The spindle LS is provided with a drive motor MLR, and the control means rotates the spindle LS to an arbitrary angle at an arbitrary angular velocity around the reference axis STZ passing through the tip of the center member LC. Can do.
The same applies to the (right) spindle device R having the (right) spindle stock RD, and the description of the (right) spindle device R is omitted.
The control means can rotate the (left) spindle LS and the (right) spindle RS in synchronization.

Further, on the base BS, there is a grindstone slide table 40 positioned at an arbitrary position in the X-axis direction along the guide means GX according to the rotation angle of the ball screw NX controlled by the X-axis drive motor MX. It is placed. The control means outputs a control signal to the X-axis drive motor MX while detecting a signal from the position detection means EX such as an encoder.
Mounted on the grindstone slide table 40 is a grindstone advance / retreat table 41 positioned at an arbitrary position in the Z-axis direction along the guide means GZ in accordance with the rotation angle of the ball screw NZ controlled by the Z-axis drive motor MZ. Is placed. The control means outputs a control signal to the Z-axis drive motor MZ while detecting a signal from the position detection means EZ such as an encoder.

A grindstone drive motor MT that generates rotational power to the grindstone T is fixed to the grindstone advance / retreat table 41.
The grindstone drive motor MT is connected to the drive pulley 21, and the drive pulley 21 transmits rotational power to the driven pulley 24 via the belt 22. The driven pulley 24 is connected to a grindstone shaft member 12 supported so as to be rotatable about the grindstone rotation axis TZ, and a substantially cylindrical grindstone T is connected to the grindstone shaft member 12. A tension pulley 23 for adjusting the tension of the belt 22 is provided in the vicinity of the belt 22. The tension pulley 23 may be omitted.

  As shown in FIG. 1B, the grindstone rotation axis TZ and the reference axis STZ are parallel, and the grindstone rotation axis TZ and the reference axis STZ are located on the virtual plane MF. In this state, when the grindstone T is brought relatively close to the workpiece W, and the point on the grindstone T side at the position where the workpiece W and the grindstone T are in contact with each other is defined as the grindstone grinding point TP, the grindstone grinding point TP is also a virtual plane. Located on MF.

[[Configuration of (Left) Spindle Device L and (Right) Spindle Device R (FIGS. 2 and 3)]
Next, the configuration and appearance of the spindle device L (corresponding to the work support device) will be described with reference to FIGS. 2A and 2B, and the right side with reference to FIGS. 3A and 3B. The configuration and appearance of the spindle device R (corresponding to the workpiece support device) will be described.
2A shows a plan view of the (left) spindle device L, and FIG. 2B shows an example of a left side view of the (left) spindle device L. In FIG. 2B, the drive motor MLR is not shown.
(Left) The spindle stock LD is fixed to the base BS, and (left) the slide motor MLS for reciprocating the spindle housing LH in the X-axis direction is fixed to the (left) spindle stock LD.
The slide motor MLS rotates the feed screw LN based on a control signal from a control means (not shown), and moves the position of the nut engaged with the feed screw LN in the X-axis direction. Then, the position in the X-axis direction of the (left) spindle housing LH connected to the connecting member LA is positioned via the connecting member LA connected to the nut.
(Left) The spindle housing LH can reciprocate in the X-axis direction along a linear guide LG (corresponding to a guide) provided on the (left) spindle base LD fixed to the base BS. The mounting position of the linear guide LG will be described later.
The (left) main shaft housing LH accommodates a (left) main shaft LS supported rotatably around the reference shaft STZ, and (left) a center member LC is provided at the tip of the main shaft LS. The axis STZ passes through the tip of the center member LC. The (left) spindle housing LH is provided with a drive motor MLR that rotates the (left) spindle LS.

Next, the (right) spindle device R will be described with reference to FIGS. 3 (A) and 3 (B). 3A shows a plan view of the (right) spindle device R, and FIG. 3B shows an example of a right side view of the (right) spindle device R. In FIG. 3B, the drive motor MRR is not shown.
(Right) The configuration and appearance of the spindle device R are the same as those of the (left) spindle device L already described, and (left) are symmetric and external to the spindle device L, but the following points (left) The main shaft device L has a different configuration.
(Right) The center rotation axis HZ, which is the rotation axis of the center member RC of the spindle device R, is set at a position eccentric from the reference axis STZ. As a result, the workpiece W sandwiched between the center member LC and the center member RC is tilted at a fine angle with respect to the X-axis direction (direction parallel to the reference axis STZ) (FIG. 5A). ) And (B)), it becomes easy to form a fine taper shape on the workpiece W.
Further, (right) the spindle device R includes an adjustment dial AT, a gear AG, and an adjustment member having a gear RHG that can adjust the position of the center rotation shaft HZ set at a position eccentric with respect to the reference axis STZ. Eccentric position adjusting means composed of AB or the like is provided.
The adjustment of the eccentric position of the center rotation shaft HZ will be described later.

● [Mounting position of linear guide LG (Fig. 4)]
Next, the mounting position of the linear guide LG for guiding the (left) (or right) main shaft housing LH (or RH) in the X-axis direction will be described with reference to FIGS.
4A is a diagram showing the mounting position of the linear guide LG in the present embodiment, FIG. 4B is a diagram showing the mounting position of the conventional linear guide LG, and FIG. It is a figure explaining the error of the linear guide LG.
As shown in FIG. 4C, the linear guide LG is configured such that the movable body LG1 can reciprocate along the guide LG2, and there is a fine gap between the guide LG2 and the movable body LG1. This gap becomes an error, and a general linear guide LG has an error ΔEa and an error ΔEb as a single unit, both of which are about 5 [μm].

In the conventional spindle apparatus shown in FIG. 4B, a plurality of linear guides LG are attached along the X-axis direction on the vertical surface MV of the spindle stock LD (or RD), and the spindle housing LH ( Or RH). The ball spline ES is attached to the vertical plane MV and at a position between the two linear guides LG along the X-axis direction, and the main shaft housing LH (or RH) is also attached to the ball spline ES.
It is relatively easy to mount a plurality of linear guides LG on the same surface in an almost parallel state. In this case, the error of the single linear guide LG is directly reflected in the spindle housing LH (or RH), and the ball spline. When ES is not added, the errors (such as rattling) in the Z-axis direction and the Y-axis direction of the spindle housing LH (or RH) are both about 5 [μm]. In order to reduce this error, an auxiliary mechanism such as a ball spline ES can be added to reduce both the Z-axis direction and Y-axis direction errors to about 1 to 3 [μm].
However, due to the addition of the ball spline ES and the like, the spindle device is enlarged and the machine tool is enlarged.

On the other hand, in the present application, as shown in FIG. 4 (A), the headstock LD (or RD) fixed to the base BS is provided so as to be parallel to the reference axis STZ and orthogonal to each other. The linear guide LG is attached to each of the two surfaces (in this case, the horizontal surface MH and the vertical surface MV), and the spindle housing (or RH) is attached to the linear guide LG.
As shown in FIG. 4B, when a plurality of linear guides LG and ball splines ES are mounted in parallel on the same surface, the linear guides LG and ball splines ES can be mounted in a substantially ideal parallel state.
However, when the linear guide LG is attached to each of different orthogonal surfaces, even if the linear guides LG are attached to the respective surfaces so as to be parallel to each other, the orthogonal surfaces themselves have an error from the ideal state. . In the present application, this error is used to correct the error due to the mutual interference of the linear guide LG. Even if the linear guide LG is mounted by the same method and procedure as before, since the orthogonal plane itself has an error, it cannot be mounted in an almost parallel state. However, the linear guide LG is interfered by mutual interference. The backlash of LG itself is reduced.

As a result of attaching the linear guide LG having an error ΔEa and an error ΔEb of about 5 [μm] shown in FIG. 4C to surfaces orthogonal to each other as shown in FIG. It was confirmed that the direction error was reduced to about 2 [μm] and the Y-axis direction error was reduced to about 2 [μm].
The error of the vertical plane MV with respect to the horizontal plane MH is preferably smaller than the errors ΔEa and ΔEb of the single linear guide LG.
With this configuration, it is not necessary to add an auxiliary mechanism such as a ball spline ES, the spindle device L (or R) can be further downsized, and the machine tool 1 can be further downsized.

In FIG. 4A, (force) Ft is a pressing force applied from the tool T to the workpiece W during machining, and (force) Fk is the workpiece W rotating in the direction opposite to the clockwise direction. This is the rotational resistance force applied to the contact point of the workpiece W when a grindstone rotating in the clockwise direction is brought into contact. A combined force of the pressing force Ft and the rotational resistance force Fk is the force Fg.
As shown in FIG. 4 (A), on the extension of the perpendicular drawn from the contact point WP on the workpiece W side at the contact point between the workpiece W and the tool T when machining the workpiece W with the tool T to the reference axis STZ. It is more preferable to provide at least one linear guide LG because the pressing force Ft of the tool T pressed at the time of machining can be appropriately received and the rigidity is increased. In order to appropriately receive the rotational resistance force Fk, it is preferable to provide at least one linear guide LG ahead of the reference axis STZ in the tangential direction of the contact point WP.

● [Adjustment of eccentric center rotation axis HZ position and center rotation axis HZ position (FIG. 5)]
Next, using FIGS. 5A to 5C, (right) in the spindle device R, the position of the center rotation axis HZ that is eccentric with respect to the reference axis STZ, and the position of the center rotation axis HZ. The adjustment will be described.
5 (A) and 5 (B) are left views of FIGS. 3 (B) to (right) main shaft housing RH, eccentric position adjusting means (adjustment member AB with gear RHG, adjustment dial AT, It is the figure which extracted gear AG etc.). 5A and 5B are plan views showing the positions of the center member LC, the center member RC, the workpiece W sandwiched between the center members LC and RC, and the grindstone T in the state of the left diagram. The figure is shown.
Here, (left) the tip of the center member LC of the spindle device L is set to pass the reference axis STZ, and (right) the tip of the center member RC of the spindle device R is set to pass the center rotation axis HZ.

As shown in FIG. 5A, the center member RC is configured to rotate around the center rotation axis HZ, and the center rotation axis HZ is set at a position eccentric with respect to the reference axis STZ. When the gear RHG rotates, the position of the (right) main shaft RS in the (right) main shaft housing RH is finely adjusted, and the position of the center rotation shaft HZ with respect to the reference shaft STZ can be adjusted. Since this structure is the same as the conventional structure, the details are omitted.
(Right) An adjustment member AB provided in the main shaft housing RH is provided with a gear RHG that fits with a gear AG (worm gear or the like) in the circumferential direction. When the operator turns the adjustment dial AT, the gear AG rotates, and as shown in FIG. 5B, the gear RHG fitted to the gear AG rotates (right) with respect to the headstock RD (right) main shaft. The position of the (right) main shaft RS in the housing RH is finely adjusted, and the position of the center rotation shaft HZ is adjusted.
With this configuration, as shown by the taper angle (Δθ1) in FIG. 5A and the taper angle (−Δθ2) in FIG. 5B, a taper shape with a fine angle can be formed on the workpiece W.

  Here, since the position of the center rotation axis HZ with respect to the reference axis STZ is eccentric, (right) the rotation axis of the drive motor MRR (corresponding to drive means) that transmits the rotational power to the main shaft RS is fixed to the reference axis STZ. If this is the case, it cannot be directly connected to the main shaft RS and the center member RC that rotate about the center rotation axis HZ (because the shaft center is shifted). Therefore, as shown in FIG. 5C, the rotational power of the drive motor MRR is transmitted to the (right) main shaft RS and the center member RC using Oldham joints TA to TC (corresponding to the axial direction conversion mechanism). In addition, you may use the existing constant velocity joint etc. instead of Oldham coupling TA-TC.

As described above, the (left) spindle device L and the (right) spindle device R described in the present embodiment include the linear guide LG on each of two surfaces orthogonal to each other, and an auxiliary mechanism for error reduction such as a ball spline. Without providing it, it is possible to ensure the same accuracy as the conventional one, so that the size can be reduced, and the machine tool 1 can be reduced in size.
In addition, by providing the axial direction conversion mechanism, even in the (right) spindle device R having a spindle that is driven to rotate, the center rotation axis HZ can be set and adjusted to a position that is eccentric from the reference axis STZ. is there.

The work support device (L, R) in the machine tool of the present invention is not limited to the appearance, configuration, structure, shape, etc. described in the present embodiment, and various modifications and additions are made without departing from the scope of the present invention. Can be deleted. The machine tool 1 is not limited to the appearance, configuration, structure, shape and the like described in the present embodiment.
The numerical values used in the description of the present embodiment are examples, and are not limited to these numerical values.
The workpiece support device in the machine tool described in the present embodiment can be used for machining various workpieces such as a crank and a camshaft.
As the center member, a so-called live center that can be rotated and a so-called dead center that is fixed so as not to rotate are known, but either type of center member may be used. The workpiece support device in the machine tool described in the present embodiment can also be applied to the spindle stock and tailstock. However, the center member to which the axial direction conversion mechanism described with reference to FIG. 5C is connected is a live center.

  In this embodiment, the workpiece support device of the cylindrical grinding machine has been described as an example. However, a machine tool (for example, a machining center) that performs machining by relatively moving the workpiece held on the workpiece table and the end mill using an end mill or the like. The present invention can also be applied. In this case, a workpiece having an arbitrary shape is fixed to the workpiece support device, and the workpiece support device is configured to be movable relative to the tool. And a workpiece | work support apparatus has a structure which can move to the direction orthogonal to the tool cutting direction which is a direction which a tool cuts into a workpiece | work at least along a some guide. The plurality of guides are parallel to the cutting direction orthogonal line, which is a line orthogonal to the tool cutting direction, and each of two surfaces provided to be orthogonal to each other along the direction of the cutting direction orthogonal line. Is provided.

DESCRIPTION OF SYMBOLS 1 Machine tool 40 Wheel slide table 41 Wheel advance / retreat table AB Adjustment member (Eccentric position adjustment means)
AT adjustment dial (Eccentric position adjustment means)
BS base HZ Center rotation axis MLR, MRR drive motor MX X-axis drive motor MZ Z-axis drive motor LG Linear guide (guide)
L, R Spindle device (work support device)
LD, RD Spindle base LH, RH Spindle housing LS, RS Spindle LC, RC Center member (support means)
STZ Reference shaft TA, TB, TC Oldham joint (axial conversion mechanism)
T grinding wheel (tool)
TZ Wheel rotation axis W Workpiece

Claims (5)

In a workpiece support device in a machine tool, which supports each of both ends of a workpiece at or near both ends by a support means and can rotate the workpiece around a reference axis passing through the center of a support location.
The work support device is provided in a pair, and at least one of the work support devices can reciprocate in the reference axis direction along a plurality of guides,
The plurality of guides are provided along two directions of the reference axis on each of two surfaces that are parallel to the reference axis and orthogonal to each other.
Work support device for machine tools. A work support device for a machine tool according to claim 1,
The support means in at least one of the workpiece support devices is a conical center member for supporting one end of a workpiece, and a center rotation shaft passing through the tip of the center member is relative to the reference axis. It is set at an eccentric position,
It is possible to support and rotate the work with the center member in one work support device and the support means in the other work support device,
Equipped with an eccentric position adjusting means capable of adjusting the position of the center rotation shaft that is eccentric with respect to the reference axis along the circumferential direction of the reference axis.
Work support device for machine tools. A work support device for a machine tool according to claim 2,
Drive means for rotating the center member around the center rotation axis;
The rotating shaft of the driving means is set at a position eccentric with respect to the center rotating shaft,
The drive means and the center member are connected via an axial direction conversion mechanism capable of transmitting rotational power to an eccentric shaft center.
Work support device for machine tools. A work support device in a machine tool according to any one of claims 1 to 3,
At least one of the plurality of guides is disposed on an extension of a perpendicular drawn from the contact point between the tool for machining the workpiece and the workpiece to the reference axis,
Work support device for machine tools. In a workpiece support device in a machine tool, in which a workpiece of an arbitrary shape is fixed and movable relative to a tool for machining the workpiece,
The workpiece support device is movable relative to the tool along a plurality of guides at least in a direction perpendicular to a tool cutting direction, which is a direction in which the tool cuts into the workpiece,
In the machine tool, the plurality of guides are formed on each of the two surfaces provided so as to be parallel to a cutting direction orthogonal line that is a line orthogonal to the tool cutting direction and to be orthogonal to each other. Provided along the direction of the direction orthogonal line,
Work support device for machine tools.

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