JPH05161B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is provided in a chuck device for a lathe and automatically adjusts the liner that grips the workpiece according to changes in the size, shape, etc. of the workpiece. This invention relates to an automatic liner changing device for chuck devices for lathes.

<Conventional technology> In machining factories, turning using a lathe usually involves gripping the workpiece (usually round or flange objects) with a chuck device installed at the end of the main spindle of the lathe, and machining it with a cutting tool. is common. The chuck device that grips the material to be cut is
With the advent and automation of lathes equipped with NC devices, by operating hydraulic cylinders, rotary cylinders, etc. built into the main body of the chuck device, complex claws that directly grip the workpiece are simultaneously moved, and the workpiece is It can be automatically attached to and detached from the chuck device.

However, the movement stroke of the plurality of claws provided on the chuck device was as short as about 10 mm in order to ensure precision in gripping the workpiece. There are also chuck devices with long travel strokes, but they have problems with accuracy. The short travel stroke of the chuck device's claws means that when building an FMS (Flexible manufacturing system) line using lathes for high-mix, low-volume production, which has been attracting attention in recent years. , is particularly problematic. In other words, the conventional chuck device described above can only respond to changes in the diameter of the workpiece within the range of the movement stroke of the jaw, which limits the target product types. In order to grip the material, the claws must be replaced, and preparations such as loosening and re-fastening of bolts are required, resulting in problems such as loss of productivity.

Therefore, the present applicant has invented a chuck device for a lathe that allows the jaw (liner) to be easily replaced and can accurately grip workpieces of a wide range of sizes within the travel stroke range of the jaw. This was proposed in patent application No. 59-211267.

4 is a front view of the chuck device for a lathe, FIG. 5 is a sectional view taken along the - arrow in FIG. 4, and FIG. 6 is a sectional view taken along the - arrow in FIG. As shown in the figure, a T-shaped groove 3 is formed in the base claw 2 built into the chuck device main body 1, and a lower claw 6 is fastened and fixed to a key 4 provided in the groove 3 with a bolt 5. has been done. The lower claw 6 has an arc-shaped reference groove, and a claw (liner) 7 has an arc-shaped reference protrusion that fits into the reference groove and has a gripping part that matches the curvature of the material to be cut. It is removably attached to the clamp bar 8 by means of a clamp bar 8.

That is, the liner 7 is attached to the lower claw 6 by the clamp bar 8 urged upward by the clamp spring 9 engaging with the liner 7, and the clamp bar 8 is pushed down against the clamp spring 9. This allows the liner 7 to be replaced with a liner appropriate for the size of the material to be cut without tightening bolts.

<Problems to be Solved by the Invention> According to the chuck device for a lathe described above, the liner replacement work is simplified and productivity is significantly improved compared to the conventional method, but since the liner replacement is performed manually, There was room for improvement to further improve productivity.

The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to provide an automatic liner changing device for a chuck device for a lathe that exhibits extremely high productivity.

<Means for Solving the Problems> The automatic liner changing device for a chuck device for a lathe according to the present invention is an automatic liner changing device that is installed in a chuck device for a lathe and automatically replaces a liner that grips a workpiece. The chuck device for a lathe includes a clamping means for removably holding various liners depending on the size of the material to be cut, and a liner pushing means for pushing out and removing the liner from the clamping means, The automatic liner exchange device includes a holding means for detachably holding the various liners;
a centering means that engages with the lathe chuck device to center the lathe chuck device and the automatic liner exchange device; and a phase in which the holding means is rotated about the centering means to face the clamping means. a mating means, a forward and backward moving means for moving the holding means towards and away from the clamping means, a liner pushing means for pushing the liner out of the holding means and delivering it to the clamping means, and activating the clamping means. The apparatus is characterized by comprising an operating means for causing the liner to be released from holding.

<Function> According to the present invention, the holding means is opposed to the clamping means so that the liner can be delivered by the centering means, the phasing means, and the forward/backward moving means, and the clamping means is brought into the liner holding release state by the operating means. After that, each liner extrusion means extrudes the liner and transfers the liner between the clamping means and the holding means, and the liner provided in the lathe chuck device is automatically exchanged according to the size of the material to be cut.

<Example> Hereinafter, an automatic liner changing device for a chuck device for a lathe according to an example of the present invention will be described based on the drawings. Incidentally, the same parts as those of the lathe chuck device described above are given the same reference numerals and redundant explanations will be omitted.

Fig. 1 is a cross-sectional view of the chuck device for a lathe and the automatic liner changing device (corresponding to the cross section taken in the direction of the - arrow in Fig. 3), and Fig. 2 is a cross-sectional view of the chuck device for a lathe and the automatic liner changing device in a state where the centering means is activated. Cross-sectional view (corresponding to the - arrow cross section in Fig. 3),
FIG. 3 is a front view of the automatic liner exchange device.

First, the clamp means and liner extrusion means provided in chuck device A for a lathe will be explained.

The clamp means for removably holding the liner 7 on the lower claw 6 by pulling down the clamp bar 8 against the clamp spring 9 includes a lever 10 which is pivotally supported by a chuck device and has one end engaged with the clamp bar 8. This lever 10 is rotated by a striker 30 of operating means, which will be described later, so that the clamp bar 8 is pulled down and the holding of the liner 7 is released.

The liner extrusion means of the lathe chuck device A includes a piston 1 which is slidably built into the lower jaw 6 and whose piston rod 11a can be projected into a groove 6a formed in the lower jaw 6 for holding the liner 7.
1, a return spring 12 that urges the piston 11 in the direction in which the piston rod 11a retracts,
It is provided with a passage 13 that guides compressed air supplied via a centering shaft 22, which will be described later, to the piston 11 so as to cause the piston rod 11a to protrude. Therefore, when the clamp bar 8 is released, the piston rod 1
By protruding 1a, the liner 7 can be pushed out and removed from the clamping means.

Further, the lathe chuck device A is provided with a substantially cylindrical shaft holder 14 that is slidable.
When a centering shaft 22 (described later) is inserted into the shaft holder 14 and the shaft holder 14 is pushed forward against the return spring 15, the communication port 14a formed in the shaft holder 14 is opened.
from the centering shaft 22 through the passage 13
Compressed air is supplied to.

Next, the liner automatic conversion device B (hereinafter referred to as liner loading hand) will be explained.

The liner loading hand B is moved by a robot hand C that grips the main body 20, and is carried into a position where the liner is replaced and carried out to a position where it does not interfere with lathe work, as will be described later. Note that the liner loading hand B can also be moved by other known transfer means.

The loading hand body 20 has a cylinder portion 21
A centering shaft 22 as a centering means is provided in the cylinder portion 21 so as to be freely slidable and biased in the retracting direction by a return spring 23. The base end of the centering shaft 22 is a piston part 22a, and the centering shaft 22 is connected to the cylinder part 21 by supplying compressed air from the supply port 24.
It is becoming more and more prominent. In this way, the centering shaft 22 is projected and its tip is fitted into the shaft holder 14, thereby centering the lathe chuck device A and the liner loading hand B.

The centering shaft 22 is provided with a stopper 25 at its base end, and when the stopper 25 engages with a sleeve 26 fixed within the cylinder portion 21, movement of the centering shaft 22 in the protruding direction is restricted at a predetermined position. It's becoming like that.
Furthermore, the centering shaft 22 is formed with a passage 22b that is open at its tip, and at a position where the protruding movement of the centering shaft 22 is restricted by the sleeve 26, a passage 28 formed in the cylinder portion 21 is opened from the supply port 27. Compressed air is fed into the passage 22b through the passage 22b. Therefore, when the centering shaft 22 protrudes until it is regulated by the sleeve 26 and the tip of the centering shaft 22 fits into the shaft holder 14, compressed air from the supply port 27 is fed to the piston 11 via the centering shaft 22. be done.

A striker 30 as an operating means is provided at the tip of the centering shaft 22, and the striker 30 is urged toward the tip of the centering shaft 22 by a spring 31. When the centering shaft 22 is fitted into the shaft holder 14 and the shaft holder 14 is pushed in, the striker 30 engages with the lever 10 and rotates the lever 10. Therefore, the clamp bar 8 is pulled down and the liner 7 is released from its holding state.

A sleeve 32 is slidably and rotatably mounted on the cylinder portion 21.
A liner holder 33 is attached to the liner holder 33 as a holding means for detachably holding the liner 7. This sleeve 32 is connected from the supply port 34 to the cylinder portion 21.
When compressed air is supplied through a passage 35 formed in the cylinder part 21, it moves forward toward the tip side of the cylinder part 21, while compressed air is supplied from the supply port 36 through a passage 37 formed in the cylinder part 21. When the liner holder 33 is pressed, the liner holder 33 moves backward, thereby forming a forward and backward moving means for moving the liner holder 33 toward and away from the clamping means.

An annular gear 40 that meshes with a drive gear 39 is fitted onto the sleeve 32, and the drive gear 39 is connected to a motor 4 attached to the loading hand body 20.
1 to drive and rotate. Therefore, when the drive gear 39 is rotated, the sleeve 32 is rotated about the cylinder portion 21 and the centering shaft 22, thereby rotating the liner holder 33 to face the clamping means. A phase matching means is configured. Incidentally, this coincidence of phases is detected by a proximity switch 47a provided on the lower claw 6 and a proximity switch 47b provided on the liner holder 33.

A piston 42 is slidably provided on the liner holder 33, and the piston 42 is attached to a piston rod 42.
A is biased by a clamp spring 43 in the direction of pulling in a. A liner holder 44 is attached to the tip of the piston rod 42a, and a clamp spring 43 holds the liner holder 44 and the liner holder 3.
The liner 7 is held between the liner 7 and the arcuate reference groove 33a formed in the liner 3.

Further, compressed air is supplied from the supply port 45 through a passage 46 to push the piston 42 against the clamp spring 43, and this compressed air causes the liner to be pressed between the groove portion 33a and the liner retainer 44. 7 can be released.
Note that 48 is a guide pin of the liner presser 44.

An extrusion cylinder 50 is attached to the liner holder 33 as a liner extrusion means for extruding the liner 7 from between the groove 33a and the liner presser 44. The extrusion cylinder 50 includes a slidably housed piston 51 and a return spring 52 that biases the piston 51 in the direction of retracting the piston rod 51a, and compressed air is supplied from the supply port 53 through the passage 54. When this happens, the piston rod 51a is projected to push the liner 7 out of the groove 33a so that it can be delivered to the clamping means.

Next, the operation when the liner 7 is attached to the lathe chuck device A will be explained.

First, the liner loading hand B is operated by the robot hand C, and the lathe chuck device A is
The chuck device A is opposed to the chuck device A with a certain distance L between the chuck device A and the chuck device A in a centered state.
In this case, the detection of the distance L and the centering are performed by the robot hand C. Next, lower nail 6
is set, for example, to the lower limit of the stroke by a drive device (not shown) provided in the chuck device A,
The liner delivery levels of the liner loading hand B and the lower claw 6 are matched. Incidentally, this operation may be performed before the operation of the robot hand C described above. Next, compressed air is supplied from the supply port 24 to cause the centering shaft 22 to protrude until it is regulated by the sleeve 26.
The tip of the shaft holder is fitted into the shaft holder 14, and the shaft holder is pushed in to communicate the passage 13 and the passage 22b through the communication port 14a, and the lever 10 is rotated by the striker 30 to clamp the clamp bar 8. Put it in a released state. Next, compressed air is supplied from the supply port 34 to move the liner holder 33 forward, and the proximity switches 47a, 47
Set so that there is a gap between b and the detection distance of about 0.5 to about 1 mm. Next, the motor 41 is operated to rotate the liner holder 33, and the proximity switch 47 is activated.
When it is detected by the signals a and 47b that the phases of the clamping means and the liner holder 33 match, the motor 41 is stopped. Next, compressed air is supplied from the supply port 45 to push down the piston 42 and release the liner 7 from being clamped by the liner presser 44. Next, compressed air is supplied from the supply port 53 to cause the piston rod 51a to protrude, and the liner 7 is pushed out and inserted into the groove 6a of the lower claw 6. Next, when the compressed air is discharged from the supply port 24 and the centering shaft 22 is returned backward, the clamp bar 8, which had been pulled down by the striker 30 via the lever 10, is returned upward by the clamp spring 9, and this clamp bar 8 The liner 7 is held by the lower claw 6 by this. After this, the liner holder 33
The installation work of the liner 7 is completed by the retraction of the robot hand C or the retraction of the robot hand C.

Next, the operation when removing the liner 7 from the lathe chuck device A will be explained. Note that the operations from phase alignment to release of the clamp by the liner holder 33 are the same as described above. After the liner holder 33 is in the unclamped state, the piston 11 is removed from the supply port 27.
Compressed air is supplied to the piston rod 11a to protrude the piston rod 11a, and the liner 7 is pushed out and inserted between the groove 33a and the liner holder 44. Next, supply port 4
5, the piston rod 42a is pulled up by the clamp spring 43, and the liner 7 is held by the liner presser 44. After the installation of the liner 7 to the liner holder 33 is completed, the compressed air is discharged from the supply port 24 to move the centering shaft 22 backward, and the supply port 36
The liner holder 33 is retracted by supplying compressed air from the robot hand C, and the liner loading hand B is retracted by the robot hand C.

Various liners can be automatically exchanged according to the size, shape, etc. of the material to be cut using the procedure described above.

Incidentally, when the robot hand C is used as in the above embodiment, the robot hand C can be used for replacing workpieces, and productivity can be further improved.

<Effects of the Invention> According to the present invention, liners can be automatically changed according to the material to be cut, and high-variety, small-lot production can be realized with extremely high productivity.

[Brief explanation of the drawing]

Figures 1 to 3 relate to an embodiment of the present invention; Figures 1 and 2 are sectional views of a chuck device for a lathe and an automatic liner exchange device, respectively, and Figure 3 is a front view of the automatic liner exchange device. , Fig. 4 to Fig. 6 relate to a conventional chuck device for a lathe, Fig. 4 is a front view, and Fig. 5 is a front view.
The figure is a sectional view taken along the - arrow in Figure 4, and Figure 6 is a cross-sectional view of the
It is a sectional view taken along the - arrow in the figure. In the drawing, A is a lathe chuck device, B is a liner loading hand, C is a robot hand, 7 is a liner, 8 is a clamp bar, 11 is a piston, 2
2 is the centering shaft, 30 is the striker,
33 is a liner holder, and 50 is a cylinder.

Claims (1)

[Claims] 1. An automatic liner exchange device that is installed in a lathe chuck device and automatically replaces a liner that grips a workpiece, and the lathe chuck device can replace various liners according to the size of the workpiece. The automatic liner exchange device includes a clamp means for removably holding the liner, and a liner extrusion means for pushing out and removing the liner from the clamp means. a centering means that engages with the chuck device to center the lathe chuck device and the automatic liner exchange device; and a phasing device that rotates the holding means around the centering means to face the clamping means. , forward and backward moving means for moving the holding means toward and away from the clamping means; liner pushing means for pushing out the liner from the holding means and delivering it to the clamping means; and holding the liner by operating the clamping means. 1. An automatic liner exchange device for a chuck device for a lathe, characterized in that it is equipped with an operating means for setting the chuck device to a released state.