JPH0768402A - Workpiece fitting device for lathe - Google Patents

Abstract

PURPOSE:To stably and easily fit workpieces by travelably providing a workrest between a workpiece holding means and a tailstock and by liftably providing a workpiece supporting member to support a workpiece from a lower side on the workrest. CONSTITUTION:A guide face 24 extending in the axial direction of a workpiece held by a chuck 16 is arranged on a bed 10, and a tailstock 26 is provided movably along this guide face 24, and a workrest 34 is movably provided on the guide face 24. This workrest 34 comprises a pair of supporting blocks 36 composed of V blocks at its ends liftably provided in the longitudinal direction. The lower end of each block 36 is formed into a piston 38 and is contained in the lift cylinder 40 vertically provided in the workrest 34. Each block 36 is vertically driven by the hydraulic pressure supplied into this lift cylinder 40. The workrest 34 itself is made to move along the guide face 24 by the operation of a drive motor and a screw mechanism.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a device for mounting a workpiece on a lathe.

[0002]

2. Description of the Related Art Conventionally, when mounting a workpiece on a lathe,
While suspending the workpiece in a substantially horizontal state by a crane or the like, attach one end of the workpiece to a chuck connected to the spindle,
After the other end is pressed by a tailing rod of a tailstock to completely attach a workpiece to a lathe, work is performed such that the workpiece and the crane are separated from each other and the crane is retracted.

[0003]

In the method as described above, the work of attaching to the chuck and the work of aligning with the tailstock must be performed while the workpiece is suspended and in an unstable state. Such work is not easy, and there is an inconvenience that a great deal of effort is required for setup.

Further, in recent years, machining systems such as tool exchange have been actively automated, but as described above, it is extremely difficult to automate mounting work while suspending a workpiece by a crane or the like. Is.

In view of such circumstances, it is an object of the present invention to provide a mounting device which can easily mount a work on a lathe and which can be easily automated.

[0006]

As means for solving the above problems, the present invention provides a holding means for holding one end of a work piece and a tailstock for pressing the other end of the work piece toward the holding means. A table, a tailstock driving means for moving the tailstock into and out of the holding means in a direction parallel to the axial direction of the workpiece, and a workpiece supported by the holding means and the tailing means at the center thereof. A device for mounting the workpiece on a lathe equipped with a turning drive means for rotating about an axis, which can travel in the same direction as the moving direction of the tailstock between the tailstock and the holding means. Mounted on the workpiece support, a workpiece support drive means for moving the workpiece support, and a plurality of positions on the workpiece support that are aligned in the traveling direction with respect to the workpiece support. It is provided so that it can be A support member crop is placed, the support member is obtained by a lifting drive means for lifting with respect to the workpiece support table (claim 1).

In this device, the center axis of the workpiece supported on the support member is pressed by the center of the holding position by the holding means and the tailstock based on the information on the axial dimension and the radial dimension of the workpiece. The operation of raising the support member with respect to the workpiece support to a position that coincides with the straight line connecting the center, and one end of the workpiece by the holding means while the workpiece is placed on the support member. An operation of traveling the work support until reaching the holding position, an operation of traveling the tailstock to a position where the other end of the work can be pressed, and an operation of holding the end of the work. It is more preferable to include attachment control means for controlling the operations of the holding means, the tailstock driving means, the workpiece support driving means, and the elevating and lowering driving means so as to perform the above (claim 2).

Further, before the work is carried in, the attachment control means is arranged to move the work support table to a preset work transfer position which is a position between the holding means and the tailstock. And is installed so as to be capable of traveling in a horizontal direction substantially orthogonal to the traveling direction of the workpiece support table toward the workpiece delivery position while supporting the workpiece, and the workpiece is placed at the delivery position. By providing the work carrying-in means for delivering the work on the supporting member, a more excellent effect as described later can be obtained (claim 3).

Further, the apparatus is provided with a position detecting means for detecting an actual end surface position of the workpiece near the holding position by the holding means, and the workpiece is placed on the supporting member in the state where the workpiece is placed. After the work support base is primarily moved until the end face reaches the vicinity of the holding position, the position detecting means detects the work end face position at this position, and the end face is held based on this end face detection position. The mounting control means may be configured to cause the workpiece support to secondarily travel until reaching the position (Claim 4), and the tailstock includes pressure detection means for detecting a pressure with which the workpiece is pressed. At the same time, the attachment control means may be configured to cause the tailstock to perform a pressing operation until the pressure detected by the pressure detection means reaches a preset pressure (claim 5). Makes it more preferable.

[0010]

According to the apparatus of the first aspect, the workpiece can be attached to the lathe in the following manner, for example.

First, the diameter of the workpiece to be mounted is previously checked, and when the workpiece is placed on the support member, the central axis of the workpiece is pressed by the center of the holding position by the holding means and the tailstock. After raising and lowering the support member with respect to the work support table to a position that coincides with a straight line connecting the center (hereinafter referred to as a normal support position), the work is placed on these support members. .

It should be noted that, instead of positioning the support member at the regular support position and then placing the workpiece thereon, the support member is sunk below the regular support position. It is also possible to carry in the work just above and raise the support member to the normal support position to scoop up the work.

Next, the workpiece support table supporting the workpiece is moved toward the holding means, and one end of the workpiece reaches the holding position by the holding means. Then, the tailstock is moved to a position where the other end of the workpiece can be pressed and pressed at the same position, and further, the holding means holds the end of the workpiece, so that the lathe is operated. Can be installed. After the mounting is completed in this way, the workpiece can be turned while the support member is lowered from the regular support position and retracted.

Further, in the apparatus according to the second aspect, the series of mounting operations are automatically performed under the drive control by the mounting control means.

In the apparatus according to the third aspect of the present invention, before the workpiece is loaded, the workpiece support table is moved to the workpiece transfer position between the holding means and the tailstock under the control of the attachment control means. And wait. Then, the workpiece carrying-in means travels in the horizontal direction substantially orthogonal to the traveling direction of the workpiece support table toward the workpiece delivering position while supporting the workpiece, and the workpiece is delivered at the workpiece delivering position. Deliver it on the support member of the work support.

In the apparatus according to the fourth aspect, at the stage where the workpiece is supported on the support member, first, the primary surface of the workpiece support table is reached until the end surface of the workpiece reaches the vicinity of the holding position by the holding means. After the traveling is performed and the position of the workpiece end face is detected by the position detecting means at this position, the secondary movement of the workpiece support base is performed based on the detected position until the end face accurately reaches the regular holding position. Is done.

According to a fifth aspect of the present invention, when the end surface of the workpiece reaches the holding position and the tailstock reaches the pressable position, the tailstock works under the control of the attachment control means. The object end face is pressed, and when the pressure reaches a certain value, the pressing operation is automatically stopped.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In this embodiment, as shown in FIGS.
What processes a rolling roll including a large-diameter roll portion 66 which is a processed portion and small-diameter shaft portions 68 at both ends thereof as the workpiece 64 will be described.

The lathe 10 shown in FIGS. 1 to 7 has a bed 12
And a headstock 14 is erected on one end side thereof. A chuck (holding means) 16 is fixed to a spindle (not shown) of the spindle stock 14. This chuck 16 has a projection 18 provided corresponding to the center of the workpiece and a claw 2 which can be expanded and contracted.
0, and the pawl 20 is driven to expand and contract by a tightening device 22. A spindle motor (turning driving means) 23 shown in FIG. 7 is connected to the spindle, and the spindle motor 23 integrally drives the spindle and the chuck 16 to rotate.

The chuck 16 is provided on the bed 10.
A guide surface 24 that extends in the axial direction of the workpiece held by the work is laid, and the tailstock 26 can travel along the guide surface 24.
Is installed. The tailstock 26 has a tailstock shaft 28 that projects in and out in the traveling direction, and a tailstock shaft drive circuit 32 shown in FIG. 10. The tailstock shaft drive circuit 32 drives the tailstock shaft 28 to move forward and backward. It is supposed to be done. Further, the tailstock 26 has the tailstock shaft drive circuit 3
2, a pressure sensor (pressure detecting means) 29 for detecting the hydraulic oil supply pressure is provided, and by this pressure sensor 29, the tailstock shaft 28 is pressed against the end surface of the shaft portion 68 of the workpiece 64 as shown in FIG. The force exerted is detected. The tailstock 28 itself is slidably driven along the guide surface 24 by the tailstock drive motor 30 shown in FIG. 10 and a screw mechanism (not shown).

Further, as a feature of this apparatus, a work support 34 is movably installed on the guide surface 24. A pair of front and rear support blocks (support members) composed of V-shaped blocks are provided at the front and rear ends of the workpiece support base 34 so as to be able to move up and down. The lower end of each support block 36 is a piston 38, which is housed in a vertical support block lift cylinder 40 provided on the workpiece support base 34. The support block 36 is driven up and down. Further, the work support table 34 itself is shown in FIG.
The work support drive motor 42 shown in FIG. 0 and a screw mechanism (not shown) are driven along the guide surface 24.

As shown in FIG. 7, a table 44 is installed beside the guide surface 24, and a carriage 46 is installed slidably along the table 44. The carriage 46 is slidably driven in a direction parallel to the guide surface 24 by a carriage drive motor 45 shown in FIG. 10 and a screw mechanism (not shown).

A tool rest 48 is installed on the carriage 46 so as to be slidable in a direction orthogonal to the sliding direction, and the tool rest 48 is slid in the above direction by a tool drive motor 47 and a screw mechanism (not shown). It is supposed to be done. A magazine 50 is rotatably installed on the tool rest 48, and a large number of blades 52 are supported by the magazine 50 along the circumferential direction. And this magazine 5
The blade 52 at 0 is properly taken out by an unillustrated automatic tool changer and mounted at a predetermined blade mounting position P, and the blade 52 at a position immediately near the blade mounting position P is shown in FIG.
A measurement probe 54 as shown in (a) and (b) is attached. The measuring probe 54 detects the position and outer diameter of the end face of the workpiece shaft 68 at a position near the chuck 16, and further detects the outer diameter of the claw 20 of the chuck 16. The detection signal is shown in FIG. It is adapted to be input to the NC control device (attachment control means) 70.

Further, a loading device 55 as shown in FIG. 9 is provided at a position opposite to the table 44 with the guide surface 24 interposed therebetween.

The loading device 55 is for loading the workpiece 64 supported by the support column 62 provided on the warehouse side into the lathe 10, and is located at an intermediate position (the workpiece) of the guide surface 24 from the warehouse. A rail 56 reaching a delivery position) and a carriage (workpiece loading means) 58 that runs along the rail 56 are provided. The dolly 58 is provided with a pair of left and right forks 60 that can be raised and lowered, and both shaft portions 68 of the workpiece 64 are supported on the forks 60. The loading device 55 and the NC control device 70
Signals are appropriately exchanged between and as described below.

As shown in FIG. 10, the NC controller 7 is used.
In addition to the signals from the measuring probe 54, the loading 55, and the pressure sensor 29, 0 indicates the axial dimension and the radial dimension of the workpiece 64 to be carried in from the central controller 72 (that is, the axis of the workpiece measured at the end of the pre-machining) Information signals relating to the directional dimension and the radial dimension) are input, and the NC control device 70 receives the tightening device 22, the spindle motor 23, the tailstock drive motor 30, the tailstock shaft drive circuit 33, and the support based on these input signals. A control signal is output to the cylinder drive circuit 41 of the block 40 lifting cylinder, the workpiece support drive motor 42, the carriage drive motor 45, and the tool rest drive motor 47 to control their operations.

Next, the automatic mounting operation of the workpiece 64 under the control of the NC controller 70 will be described.

1) Return of the work support stand-by position (FIG. 1) Before the work 64 is loaded, the NC controller 70 operates the work support drive motor 42 to drive the work support 34.
Is returned from the previous installation work end position (solid line position in FIG. 1) to the center workpiece transfer position (two-dot chain line position in FIG. 1).

2) Lifting of the support block (FIG. 2) At the workpiece transfer position, the NC control unit 70 extends the support block lifting cylinder 40 to move the workpiece support table 34.
The support block 36 to the lowermost position (solid line position in FIG. 2)
To the normal support position (the position indicated by the two-dot chain line in the figure). This regular support position is based on the diameter dimension of the workpiece 64 input from the central control unit 72, and when the shaft portions 68 of the workpiece 64 are supported on the support blocks 36, the center axis X of the workpiece 64 is supported. Is set to a height position where it can be regarded as being coincident with a straight line connecting the projection of the chuck 16 (center of the holding position) and the center of the tailstock shaft 28 (center of pressing). When the positioning of the support block 36 is completed, the NC control device 70 outputs a standby signal to the loading device 55.

3) Workpiece loading and delivery (FIGS. 3 and 9) The loading device 55 starts the loading operation of the workpiece 64 in response to the standby signal. First, at a position where the carriage 58 is most retracted as shown by the solid line in FIG. 9, both forks 60 of the carriage 58 are lifted from the lowermost position to scoop up the workpiece 64 from the support column 62, and the carriage 58 is moved forward as it is. Then, it is conveyed to a position directly above the support block 36.
Then, the work 6 is dropped by lowering the fork 60.
Both shaft portions 68 of No. 4 are placed on both support blocks 36 (see FIG. 3).
State). After the delivery of the workpiece 64 is completed in this way, the carriage 58 is retracted and retracted from the lathe 10.
At this point, the loading device 55 has the NC controller 70.
Output a carry-in completion signal to.

4) Workpiece support platform travel (FIGS. 4 and 8)
(A)) After the workpiece is loaded, the NC control device 70 again activates the workpiece support drive motor 42 to move the workpiece support 34 in the direction approaching the headstock 14. Then, based on the information on the axial dimension of the workpiece input from the central control unit 72, the end surface of one shaft portion 68 of the workpiece 64 reaches the position near the chuck 16 (the position in FIG. 8A). When it is expected that the work support 34 is stopped, the work support 34 is stopped (primary travel).

Next, the NC control unit 70 operates the carriage drive motor 45 and the tool rest drive motor 47 to operate the tool rest 4.
8 is moved in the horizontal direction, the contact of the measuring probe 54 mounted on the tool rest 48 is brought into contact with the end face of the shaft portion 68 to detect the accurate position of this end face, and FIG. As shown in FIG.
The outer diameter of the tip portion 69 is accurately detected by making contact with the outer peripheral surface of 9. Then, based on the position of the end face, the workpiece support table 34 is moved at a very low speed to a position where the recess 69a formed on the end face fits the protrusion 18 on the chuck 16 side (position in FIG. 8B; holding position). Allow (secondary run).

5) Traveling on the tailstock (FIG. 5) The NC controller 70 operates the tailstock drive motor 30 to move the tailstock 26. Then, the tailstock 26 is stopped when the tailstock shaft 28 of the tailstock 26 reaches a position where the other end of the workpiece 64 can be pressed.

6) Tailstock shaft projection (FIG. 6) The NC control device 70 outputs a control signal to the tailstock shaft drive circuit 32 to cause the tailstock shaft 28 to project and press it against the workpiece end surface. At this time, the hydraulic oil supply pressure in the tailstock shaft drive circuit 32 detected by the pressure sensor 29 is monitored, and when the hydraulic oil supply pressure reaches a certain value, that is, the pressing force by the tailstock shaft 28. When the value reaches a certain value, the tailstock shaft 28 is stopped from projecting.

7) Chuck drive (FIG. 8 (b)) The NC controller 70 operates the tightening device 22 to reduce the diameter of the claw 20 and at the same time, contacts the measuring probe 54 to the outside of the claw 20. Are contacted with each other to detect the outer diameter of the claw 20, and this is monitored. Then, based on this detected outer diameter and the outer diameter of the shaft tip 69 that has already been detected by the measuring probe 54, the claw 20 contracts until it is considered that the claw 20 has completely gripped the shaft tip 69. The fastening device 22 is stopped when the diameter is reached. As a result, the shaft end 69 is held by the chuck 18,
The attachment of the work piece 64 to the lathe 10 is completed.

After that, the support block 36 is lowered to retract from the workpiece 64, and the spindle motor 23 is operated to rotate the workpiece 64 integrally with the chuck 16, whereby the turning can be performed.

It should be noted that the operation of carrying out the workpiece 64 after processing may be carried out in the opposite manner to the above.

As described above, in this apparatus, the chuck 1
The work piece 64 is supported from below by the work piece support table 34 located between the work piece 6 and the tailstock 26, and the work piece 64 is mounted by appropriately moving the work piece support table 34 in this state. Since it was done, the work 6
As compared with the case where the mounting is carried out while suspending 4 by a crane or the like, the mounting work can be carried out in a more stable state and more easily, and the work can be automated.

Further, in this apparatus, a carriage 58 for supporting the workpiece 64 from below is provided as a workpiece carrying-in means, and the workpiece 64 is carried in the lathe 10 in the horizontal direction by the traveling of the carriage 58. As compared with the conventional case where the workpiece 64 is hung by a crane or the like and carried in from above, the workpiece 64 can be carried in more safely. Further, the mounting work of the workpiece 64 can be automatically started at an appropriate timing after the loading is completed.

Further, in this apparatus, after the workpiece is loaded, the workpiece support 34 is primarily moved and then stopped, and the accurate position of the end face of the workpiece is detected here, and then the workpiece is detected based on the detection result. Since the support base 34 is secondarily moved so that the end face reaches the holding position, the workpiece 64 can be moved more accurately.

In this apparatus, the pressure sensor 29 detects the pressing force of the end face of the workpiece by the tailing shaft 28, and when the pressing force reaches a predetermined value, the pressing operation is stopped. The tailstock shaft 28 can automatically press the work piece 64 with a desired pressure.

In the above embodiment, when the loading device 55 transfers to the support block 36, the support block 36 is raised in advance at the regular support position, and the workpiece 64 is placed thereon. , Instead of this,
The support block 36 is previously sunk to a position lower than the regular support position, the work 64 is carried in immediately above, and then the support block 36 is raised to the regular support position to move the work 64. It may be scooped up.

In the above embodiment, each operation is performed one by one, but a plurality of operations may be performed concurrently in a possible range. For example, 4) above
Workpiece support platform travel and 5) tailstock travel can be executed simultaneously.

[0044]

As described above, according to the present invention, the work supporting base is movably installed between the holding means and the tailstock, and the supporting member for supporting the work from below is provided on the work supporting base. Since it is provided so as to be able to move up and down, after the work is placed on the support member, the work of attaching the work can be performed more easily in a more stable state by traveling the work support base and raising and lowering the support member. Therefore, there is an effect that the time required until the start of processing can be significantly shortened. By providing the mounting control means according to the second aspect, it is possible to easily automate the mounting work, which greatly contributes to labor saving.

Further, in the apparatus according to the third aspect, there is provided a work piece carrying-in means for traveling while supporting the work piece from below, and the work piece carrying-in means allows the work piece to be carried in horizontally to the lathe. Therefore, it is possible to carry in the work more safely than in the conventional case where the work is hung by a crane or the like and carried in from above.
Further, it is possible to automatically start the work of attaching the work piece at an appropriate timing after the loading is completed.

In the apparatus according to the fourth aspect of the present invention, after the workpiece is loaded, the workpiece is primarily moved until its end surface reaches the vicinity of the holding position of the holding means, where the accurate position of the workpiece end surface is detected and thereafter Since the workpiece support base is secondarily moved based on the detection result and the end surface is made to reach the holding position, the workpiece can be moved more accurately, and a better workpiece can be obtained. There is an effect that holding can be performed.

Further, in the apparatus according to the fifth aspect, pressure detecting means for detecting the pressing force of the tailstock on the workpiece end surface is provided, and the pressing operation is stopped when the detected pressure reaches a predetermined value. Therefore, there is an effect that the work piece can be automatically pressed with a desired pressure by the tailstock.

[Brief description of drawings]

FIG. 1 is a front view showing a step of returning a work support base to a work delivery position in an embodiment of the present invention.

FIG. 2 is a front view showing a step of raising a support member to a regular support position with respect to the work support base.

FIG. 3 is a front view showing a step of loading a workpiece onto the support member.

FIG. 4 is a front view showing a step of traveling the work support table until the end surface of the work reaches the holding position of the chuck.

FIG. 5 is a front view showing a step of causing the tailstock to travel to a pressable position in the lathe.

FIG. 6 is a front view showing a step of projecting the tailstock rod at the pressable position.

FIG. 7 is an overall plan view of the lathe.

FIG. 8A is a partial cross-sectional plan view showing a state in which the end face of the workpiece reaches the vicinity of the chuck on the lathe, and FIG. 8B is a partial cross-sectional front view showing the state where the workpiece is gripped by the chuck. Is.

FIG. 9 is a side view of a loading device attached to the lathe.

FIG. 10 is a block diagram showing input / output signals of an NC control device attached to the lathe.

[Explanation of symbols]

10 Lathe 16 Chuck (Holding Means) 18 Protrusion 20 Claw 22 Tightening Device 23 Spindle Motor (Turning Drive Means) 26 Tailstock 30 Tailstock Drive Motor (Tailstock Drive Means) 32 Tailstock Drive Circuit 34 Workpiece Support Platform 36 Support block (support member) 40 Support block lifting cylinder (elevation drive means) 42 Work support drive motor (work support drive means) 54 Measurement probe (position detection means) 55 Loading device 58 Cart (workpiece loading) Means) 64 Workpiece 70 NC control device (mounting control means)

Claims (5)

[Claims] 1. A holding means for holding one end of a work piece, a tailstock for pressing the other end of the work piece toward the holding means, and an axis of the workpiece with respect to the tailstock. The work piece to a lathe provided with tailstock driving means for contacting and separating in a direction parallel to the direction, and turning driving means for rotating the work supported by the holding means and the tailing means around its central axis. A device for mounting, which is provided between the tailstock and a holding means so as to be able to travel in the same direction as the movement direction of the tailstock, and the work support for traveling. Workpiece support base driving means, and a plurality of positions on the workpiece support base arranged in the traveling direction so as to be able to move up and down with respect to the workpiece support base, and the workpiece is placed on the upper surface. Support member and this support member to the work support table An apparatus for attaching a workpiece to a lathe, which is provided with an elevating and lowering drive means for elevating and lowering it. 2. The apparatus for mounting a workpiece on a lathe according to claim 1, wherein the central axis of the workpiece supported on the support member is based on information about the axial dimension and the radial dimension of the workpiece. An operation of raising the support member with respect to the workpiece support base to a position that coincides with a straight line connecting the center of the holding position by the holding means and the center of pressing by the tailstock, and the workpiece is placed on the support member. In this state, the operation of moving the work support base until one end of the work reaches the holding position by the holding means, and the operation of moving the tailstock to a position where the other end of the work can be pressed. And an attachment control means for controlling the operation of the holding means, the tailstock driving means, the workpiece support driving means, and the lifting driving means so as to perform an operation of holding the end of the workpiece. Features A device for attaching a workpiece to a lathe. 3. A workpiece mounting device for a lathe according to claim 2, wherein a preset workpiece transfer position is a position between the holding means and the tailstock before the workpiece is loaded. The mounting control means is configured to move the work support table up to and the horizontal direction substantially orthogonal to the traveling direction of the work support table toward the work delivery position while the work is supported. A work mounting device for a lathe, which is provided so as to be capable of traveling and has a work carrying-in means for transferring the work at the transfer position onto the support member. 4. The apparatus for mounting a workpiece on a lathe according to claim 2 or 3, further comprising position detecting means for detecting an actual end surface position of the workpiece in the vicinity of the holding position by the holding means. After the workpiece support base is primarily moved until the end surface of the workpiece reaches the vicinity of the holding position with the workpiece placed on the support member, the workpiece is detected by the position detecting means at this position. A workpiece on a lathe characterized in that the mounting control means is configured to detect the end face position and to make the workpiece support secondarily travel based on the end face detection position until the end face reaches the holding position. Mounting device. 5. The apparatus for mounting a work on a lathe according to claim 2 or 3, further comprising pressure detection means for detecting a pressure with which the tailstock presses the work.
A mounting device for a workpiece on a lathe, characterized in that the mounting control means is configured to cause the tailstock to perform a pressing operation until the pressure detected by the pressure detecting means reaches a preset pressure. .