JP3636548B2 - Machine tool work unloading device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a work unloading device for a machine tool that performs processing by gripping a work with a chuck.
[0002]
[Prior art]
Machine tools that hold workpieces in the chuck and perform machining, for example, workpiece unloading devices for bar material processing lathes that sequentially cut off the finished product by parting off, move the bucket at the tip of the swing arm to the workpiece receiving position directly below the chuck and the workpiece outside the machine. 2. Description of the Related Art Swing arm type work unloading devices that carry out work unloading by alternately positioning to a work unloading position to be taken out are often used.
However, since recent lathes have a large number of knives, a two-saddle type lathe having turrets on the upper and lower sides is often used so that complicated machining can be completed with one chuck.
[0003]
In such a 2-saddle lathe work carry-out device, it is often difficult to increase the bucket size, particularly the bottom depth, which is limited by the gap between the lower tool post and the cover.
Therefore, as shown in FIG. 7, when a relatively large-diameter workpiece W is transported by the bucket 101 having a shallow bottom, an accident occurs in which the workpiece W jumps over the side plate and falls during turning. For this reason, conventionally, as a measure for bitterness, the operating range of the lower tool rest, in particular, the amount of X-axis movement to the plus side is limited, or the cover is modified to deepen the bottom of the bucket so that it can handle large-diameter workpieces W. Yes.
[0004]
[Problems to be solved by the invention]
As described in the prior art, a two-saddle lathe having turrets on the upper and lower sides has a problem that it is difficult to use a deep bottom bucket that can handle a large-diameter workpiece as it is.
The present invention has been made in view of such problems of the prior art, and the object of the present invention is not to limit the X-axis operation range of the lower tool post, and without modifying the cover. It is an object of the present invention to provide a swing arm type work carry-out device capable of carrying a relatively large-diameter work.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a workpiece carry-out device for a machine tool according to the present invention is a bucket provided at the tip of a swing arm that can swing around an axis parallel to the main axis of a machine tool that processes a workpiece held by a chuck. In the workpiece unloading apparatus for alternately positioning the workpiece receiving position below the chuck for receiving the workpiece to be dropped after the machining is finished in a substantially horizontal posture and the workpiece dispensing position for delivering the workpiece to the outside in a substantially vertical posture, A hollow rectangular tube-shaped frame body provided at the tip of the swing arm and opened substantially vertically at the workpiece receiving position, and a spring fitted to the frame body so that the bottom is shallower or deeper. A bottomed rectangular tube-shaped main body portion that is constantly urged so that the bottom is shallow, and means for restricting the range of movement of the main body portion relative to the frame body portion Constitute the door, the main body receives a work exceeds a set weight is to move to the bottom against the force of the spring becomes deeper.
[0006]
According to the workpiece carry-out device of the machine tool configured as described above, the bucket is formed by the hollow frame body provided at the tip of the swing arm and the bottomed main body that can move with respect to the frame body. When a large workpiece with a relatively large weight is received in a horizontal position at the workpiece receiving position, the main body moves against the spring force to deepen the bottom against the spring weight, and the bucket becomes deep. Will not fall. And when the workpiece is paid out in the almost vertical posture at the workpiece dispensing position, the bottom of the bucket becomes shallow, and the bucket becomes a shallow bucket with the original bottom, so that the X-axis operation range of the lower tool rest is maintained with the standard cover. Large diameter workpieces can be carried out without any restrictions.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a workpiece carry-out device for a machine tool according to the present invention will be described with reference to the drawings.
FIG. 1 is an operation explanatory view showing the entire workpiece unloading device, FIG. 2 is an enlarged front view of the bucket portion, FIG. 3 is a side view of the bucket as seen from a direction perpendicular to the arrow AA in FIG. FIG. 5 is an explanatory view showing a standby posture of the bucket that avoids interference with the lower tool rest, and FIG.
[0008]
The lathe shown in FIG. 4 has two sets of Z-axis direction guide surfaces in parallel on a bed (not shown), and an upper tool rest (not shown) via a saddle movable on each Z-axis direction guide surface in the Z-axis. A lower tool post 1 shown in FIG. 5 is provided to be movable in the X-axis direction. An upper turret and a lower turret 1 are respectively provided with an upper turret (not shown) and a lower turret 2 shown in FIG. 5 so as to be able to turn and index around the turning center axis in the Z-axis direction.
[0009]
1 and 4 is installed on the left side of a bed (not shown). A spindle (not shown) is rotatably supported on the spindle table 3, and a chuck 4 is concentrically attached to the tip of the spindle. ing. The lathe is covered with an entire cover, and the upper surface and the front surface of the machining area are covered with a cover 5 that can be opened and closed.
[0010]
As shown in FIG. 1, the swinging center shaft 6 of the workpiece carry-out device is rotatably supported at a position near the main shaft on the lower side of the front side surface of the bed, and a lever 7 is integrally formed at the end of the swinging center shaft 6 on the main shaft side. In addition, the rear end of the swing arm 8 is fitted to the center portion through a key. A pin 9 is planted in parallel to the swinging central axis 6 on the side surface of the tip of the swing arm 8, and an arm 11 for the bucket 12 is attached to the pin 9 so that the mounting angle position can be changed. . The bucket 12 is composed of a frame body portion 12A and a main body portion 12B. The frame body portion 12A has a hollow square tube shape with a side surface, and the distal end portion of the arm 11 is fixed to the central portion of one side surface via a mounting shaft 13. When the workpiece receiving position a, which will be described later, is in a substantially horizontal posture, the workpiece W is opened in a substantially vertical direction, and when the workpiece is paid out in a later-described workpiece dispensing position b, the workpiece W is likely to roll onto the side plate 12b that is the bottom surface. Has an inclination angle.
[0011]
Further, the frame portion 12A is provided with a support shaft 14 at the upper corner portion at the front end in parallel with the swinging central shaft 6, and is substantially the same shape as the frame portion 12A and is larger than the frame 12A by a fitting gap. A main body 12B having 12c is provided so as to be swingable about the support shaft 14. In the main body 12B, an arc-shaped elongated hole 12a centered on the support shaft 14 is formed on one side surface, and a notch groove 12d is formed on the other side surface to avoid interference with the mounting shaft 13.
[0012]
And the positioning pin 15 planted at right angles to the other side surface of the frame portion 12A is movable in the arc-shaped elongated hole 12a, and the arc-shaped elongated hole 12a, the positioning pin 15 and Thus, the swing range of the main body 12B relative to the frame body 12b is restricted, and the main body 12B is constantly biased by the spring 16 so as to overlap the frame 12A and the bottom 12c becomes shallow.
[0013]
As shown in FIG. 1, an air or hydraulically driven fluid pressure cylinder 18 is supported on a machining region side of the headstock 3 front side surface 3a via a bracket 17 so that the rear end portion thereof can swing substantially vertically and downward. The tip of the piston rod 18 a of the fluid pressure cylinder 18 is rotatably supported by the tip of the lever 7 via a pin 19.
[0014]
A support 21 is fixed to the lower side of the front surface of the cover 5, and a work storage box 22 is detachably mounted on the support 21. A workpiece unloading hole 5a is opened at a position corresponding to the workpiece storage box of the cover 5, and the workpiece unloading hole 5a is always closed by a swingable and suspended door 23, and is unloaded from the bucket 12 only when the workpiece is unloaded. Pressed to open.
[0015]
The bucket 12 at the tip of the swing arm 8 configured as described above is indexed by the fluid pressure cylinder 18 to the workpiece receiving position a below the chuck 4 and the workpiece dispensing position b inside the workpiece unloading hole 5a. The bucket 12 is in a substantially horizontal posture having a loosely inclined angle capable of holding the workpiece at the workpiece receiving position a, and substantially vertical at the workpiece dispensing position b, and the workpiece W to be held is paid toward the workpiece discharge hole 5a. The posture is convenient for putting it out, and after taking out the workpiece, it is waiting in this posture.
[0016]
Next, the operation of the present embodiment will be described.
Now, the cutting process performed on the round bar held by the chuck 4 of the lathe is approaching the end, and the work W is being cut off by the final cut-off operation. Immediately before the workpiece W is cut off, the pressure fluid is supplied to the lower chamber of the fluid pressure cylinder 18, the swing arm 8 waiting at the workpiece dispensing position b turns clockwise, and the bucket 12 at the tip receives the workpiece. Positioned at position a.
[0017]
When the positioning of the bucket 12 to the workpiece receiving position a is finished, the workpiece W is cut off and the workpiece W is placed on the bucket 12. In the case of a relatively large-diameter workpiece as shown in FIG. 1, the main body portion 12B of the bucket 12 turns counterclockwise around the support shaft 14 against the force of the spring 16 by the weight of the workpiece W, As the bottom 12c of 12 becomes deeper, the inclination angle becomes larger, and the workpiece W rolls on the inclined bottom 12c and comes into contact with the side plate 12b and stops.
[0018]
Next, the pressure fluid is supplied to the upper chamber of the fluid pressure cylinder 18, the swing arm 8 turns counterclockwise, and the bucket 12 is positioned at the workpiece discharge position b. In this state, the bucket 12 is in a substantially vertical posture as described above, and the workpiece W rolls on the side plate 12b serving as the bottom surface, opens the door 23, and is discharged into the workpiece storage box 22 from the workpiece discharge hole 5a. The
[0019]
As shown in FIG. 5, the bucket 12 in the standby posture after the workpiece W has been paid out has a main body portion 12 </ b> B that is deeply overlapped with the frame body portion 12 </ b> A by the force of the spring 16 and has a shallow bottom, and the lower tool rest 1 is positive. When it is positioned at the side X-axis movement end, or when the Z-axis movement is performed in this state, it does not interfere with the lower tool rest 1.
As shown in FIG. 6, a bottomed rectangular tube-shaped main body portion 25B is movably fitted to a hollow rectangular tube-shaped frame body portion 25A, and is urged by a spring 26 so that the bottom 25a is always shallow, It is good also as the bucket 25 which restricted the movement range with respect to the frame part 25A of the main-body part 25B with the pin 27. FIG.
[0020]
【The invention's effect】
Since the workpiece discharging apparatus for a machine tool according to the present invention is configured as described above, the following effects can be obtained.
When the bucket consisting of members such as the frame and main body is positioned at the workpiece receiving position below the chuck, and when the bucket receives the workpiece that drops after processing, the main body resists the spring force due to the workpiece weight. The bottom of the bucket becomes shallower when the workpiece is paid out at the workpiece delivery position so that the bottom of the bucket becomes deeper. It is possible to avoid interference between the lower tool rest and the bucket in a lathe with a small gap between them and a complex shape can be achieved with one chuck by making multiple blades without modifying the cover or limiting the operating range of the moving object It becomes a workpiece carry-out device that can be installed in a recent machine tool capable of machining.
[Brief description of the drawings]
FIG. 1 is an operation explanatory diagram showing the entire workpiece carry-out device of the present invention.
FIG. 2 is a front view of a bucket at a workpiece payout position.
FIG. 3 is a side view of the bucket as seen from a direction perpendicular to the AA arrow line in FIG. 2;
FIG. 4 is a perspective view of a lathe having a workpiece carry-out device.
FIG. 5 is an explanatory view showing a standby posture of a bucket that can avoid interference with a lower tool post.
6 is a diagram showing a bucket different from FIG. 2; FIG.
FIG. 7 is an explanatory view showing a state where a workpiece falls from a bucket during conveyance when a bucket having a shallow bottom according to the prior art is used.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower tool post 3 Spindle base 4 Chuck 5 Cover 6 Oscillation center axis 8 Swing arm 12, 25 Bucket 12A, 25A Frame part 12B, 25B Main body part 12a Arc-shaped long hole 15 Positioning pin 16 Spring 18 Fluid pressure cylinder 22 Work storage box a Work receiving position b Work paying position W Work

Claims (1)

A workpiece provided at the tip of a swing arm swingable about an axis parallel to the main axis of the machine tool that processes the workpiece gripped by the chuck receives the workpiece dropped after the processing is finished in a substantially horizontal posture. In a workpiece carry-out device that alternately positions a workpiece receiving position and a workpiece dispensing position for delivering the workpiece to the outside in a substantially vertical posture, a hollow angle that is provided at the tip of the swing arm and opens substantially vertically at the workpiece receiving position. A cylindrical frame body portion, and a bottomed rectangular tube shape that is movably fitted to the frame body portion so that the bottom becomes shallower or deeper and is constantly biased by a spring so that the bottom becomes shallower. The bucket is configured by a main body portion and a means for regulating a movement range of the main body portion with respect to the frame body portion. Work unloading device for a machine tool, characterized in that moves such bottom is deeper against the force.

Images