JPH09314403A - Work take-out system ror machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a swing arm type work taking-out system used for a machine tool which has as small a space between a cutter table and a cover as a two-saddle type lathe does and can not take the necessary depth for a bucket. SOLUTION: A bucket 12 whose positioning is defined by a work receiving position (a) at the distal end of a swing arm 8 and taking out position (b) is square frame shaped and is fixed to a swing arm 8 with an arm 11. The bucket 12 is pivoted by a shaft 14 to be rockable and the bottom of the bucket is hingedly supported with a spring 16 urged to decrease the depth so that when the bucket received the heavier work at the point (a), the depth of the bucket is increased, and the work can be securely received in the bucket without being slipped out from the bucket. When the bucket unloads the work, the depth of the bucket resumes the original dimension.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work unloading device for a machine tool which grips a work by a chuck and performs processing.

[0002]

2. Description of the Related Art A machine tool for gripping a workpiece on a chuck for machining, for example, a workpiece unloading device for a bar material lathe that sequentially cuts off finished products by cutting off is a bucket arm at the tip of a swing arm and a workpiece receiving position directly below the chuck. A swing-arm type work unloading device that carries out the work by alternately positioning it at the work paying position for paying out the machine is often used. However, in recent lathes, two saddle type lathes having upper and lower turrets have been widely used so that complicated machining can be completed with one chuck by holding a large number of knives.

The work carrying-out device of this two-saddle type lathe is
It is often difficult to increase the bucket size, especially the bottom depth, because it is limited by the gap between the lower tool rest and the cover.
Therefore, as shown in FIG. 7, when the work W having a relatively large diameter is attempted to be conveyed by the bucket 101 having a shallow bottom, an accident occurs in which the work W jumps over the side plate and drops during turning. For this reason, conventionally, as a measure against bitterness, the operation range of the lower tool rest, especially the X-axis movement amount to the plus side, is limited, or the cover is modified to deepen the bottom of the bucket so that it can cope with a large-diameter work W. There is.

[0004]

As described in the prior art, a two-saddle type lathe having upper and lower turrets, respectively,
There is a problem that it is difficult to use a deep-bottomed bucket that can handle large-diameter workpieces. The present invention has been made in view of the above problems of the prior art, and an object of the present invention is not to limit the X-axis operation range of the lower tool rest and to modify the cover. An object of the present invention is to provide a swing-arm type work unloading device capable of carrying a work having a relatively large diameter.

[0005]

In order to achieve the above object, a work unloading device for a machine tool according to the present invention is capable of swinging about an axis parallel to a main axis of a machine tool for machining a work held by a chuck. Alternate between the work receiving position below the chuck, which receives the work to be dropped after the processing of the bucket provided at the tip of the swing arm, in a substantially horizontal posture, and the work payout position where the work is discharged to the outside of the machine in a substantially vertical posture. In the work unloading device that is positioned at, the frame body of a hollow rectangular tube provided at the tip of the swing arm and opening substantially vertically at the work receiving position, and the bottom of the frame body may become shallow or deep. A main body having a bottomed rectangular tube shape that is movably fitted to the main body and is always biased by a spring so that the bottom becomes shallow, and a moving range of the main body with respect to the frame body. By means win constitutes the bucket, the body portion receives a work exceeds a set weight is to move to the bottom against the force of the spring becomes deeper.

According to the work unloading device for a machine tool constructed as described above, the hollow frame portion provided at the tip of the swing arm and the bottomed main body portion movable with respect to the frame body portion and the like. When a large-diameter workpiece with a relatively large weight is received in a horizontal position at the workpiece receiving position, the main body moves against the force of the spring due to the weight of the workpiece, and the bucket moves to a deeper bottom. It becomes deep and the work does not fall. Then, when the workpiece is dispensed in a substantially vertical posture at the workpiece dispensing position, the bottom of the bucket becomes shallower, and the bucket becomes a shallow bucket at the original bottom to wait, so the X-axis operation range of the lower turret can be adjusted with the standard cover. It is possible to carry out large-diameter workpieces without limitation.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A work unloading device for a machine tool according to the present invention will be described below with reference to the drawings. 1 is an operation explanatory view showing the entire work 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 line AA in FIG. 2, and FIG. FIG. 5 is a perspective view of a lathe having a work unloading device, and FIG. 5 is an explanatory view showing a standby posture of a bucket that avoids interference with the lower tool rest.

In the lathe shown in FIG. 4, two sets of Z-axis direction guide surfaces are parallel to each other on a bed (not shown), and the respective Z-axis direction guide surfaces are not shown via saddles movable in the Z-axis direction. The turret and the lower turret 1 shown in FIG. 5 are provided so as to be movable in the X-axis direction. The upper turret and the 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 rotatable and indexable about the central axis of rotation in the Z-axis direction.

A headstock 3 shown in FIGS. 1 and 4 is installed on the left side of a bed (not shown), and a spindle (not shown) is rotatably supported by the headstock 3, and a chuck 4 is concentrically provided at the tip of the spindle. It is attached. The lathe is covered with the entire cover, and the top and front of the processing area can be opened and closed.
Covered by

As shown in FIG. 1, the swing center shaft 6 of the work unloading device is rotatably supported at a position near the main shaft on the lower side of the front side of the bed, and a lever 7 is attached to the end of the swing center shaft 6 on the main shaft side. The swing arm 8 is integrally formed, and the rear end of the swing arm 8 is fitted to the center portion thereof through a key. A pin 9 is planted on the side surface of the tip end of the swing arm 8 in parallel with the swing center shaft 6, and an arm 11 for a 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 portion 12A and a main body portion 12B, and the frame portion 12A has a hollow rectangular tube shape with a side surface of a V shape, and the tip end portion of the arm 11 is fixed to the center portion of one side surface via the mounting shaft 13. When the work W is in a substantially horizontal position at a work receiving position a, which will be described later, the work W is liable to roll out on the side plate 12b which is opened in a substantially vertical direction and is in a substantially vertical position at a work paying position b, which will be described later. The angle of inclination is attached to.

Further, a support shaft 14 is provided in the upper corner portion at the tip of the frame portion 12A in parallel with the swing center shaft 6,
A main body portion 12B having substantially the same shape as the frame body portion 12A and having a bottom 12c larger than the frame body 12A by a fitting gap is provided so as to be swingable around the support shaft 14. Main unit 1
In 2B, an arcuate elongated hole 12a centering on the support shaft 14 is formed on one side surface, and a notch groove 12d for avoiding interference with the mounting shaft 13 is formed on the other side surface.

A positioning pin 15, which is planted at a right angle on the other side surface of the frame body 12A, is movable in the arc-shaped elongated hole 12a and positioned with the arc-shaped elongated hole 12a. The swing range of the main body portion 12B with respect to the frame body portion 12b is regulated by the pin 15, and the main body portion 12B is constantly urged by the spring 16 so that the bottom portion 12c becomes shallow by overlapping with the frame body portion 12A.

As shown in FIG. 1, an air or hydraulically driven fluid pressure cylinder 18 is supported by a bracket 17 on the front side surface 3a of the headstock 3 through a bracket 17 so that its rear end can swing substantially vertically and downward. The tip of the piston rod 18a of the fluid pressure cylinder 18 is rotatably supported by the tip of the lever 7 via a pin 19.

A support 21 is fixed to a position near the lower front side of the cover 5, and a work storage box 22 is removably placed on the support 21. The work carry-out hole 5a is opened at a position corresponding to the work storage box of the cover 5, and the work carry-out hole 5a is provided.
The door a is constantly closed by a swingably suspended door 23, and is opened by being pushed by the work W delivered from the bucket 12 only when the work is delivered.

The bucket 12 at the tip of the swing arm 8 configured as described above is indexed by the fluid pressure cylinder 18 into a work receiving position a below the chuck 4 and a work delivering position b inside the work unloading hole 5a. At the work receiving position a, the bucket 12 has a substantially horizontal posture with a gentle inclination angle for holding the work, and at the work delivering position b, it is substantially vertical, and the work W to be held is inserted into the work discharge hole 5a. It has a convenient posture for paying out toward the customer, and after paying out the work, it stands by in this posture.

Next, the operation of this embodiment will be described. Now, the cutting process performed on the round bar material gripped by the chuck 4 of the lathe is approaching the end, and the process of cutting off the work W by the final parting operation is started. Immediately before the work W is cut off, pressure fluid is supplied to the lower chamber of the fluid pressure cylinder 18, and the swing arm 8 waiting at the work dispensing position b pivots clockwise, and the bucket 12 at the leading end receives the work. Positioned at position a.

When the bucket 12 is positioned at the work receiving position a, the work W is cut off and the work W is placed on the bucket 12. As shown in FIG. 1, in the case of a work having a relatively large diameter, the weight of the work W causes the main body portion 12B of the bucket 12 to rotate counterclockwise about the support shaft 14 against the force of the spring 16 to cause the bucket 12 to rotate. As the bottom 12c of 12 becomes deeper and the inclination angle becomes larger, the work W rolls on the inclined bottom 12c and comes into contact with the side plate 12b and stops.

Next, the pressure fluid is supplied to the upper chamber of the fluid pressure cylinder 18, the swing arm 8 pivots counterclockwise, and the bucket 12 is positioned at the work delivery position b. In this state, the bucket 12 is in a substantially vertical posture as described above, and the work W is the bottom surface of the side plate 12.
Rolling on b, the door 23 is opened and the work is discharged into the work storage box 22 through the work unloading hole 5a.

As shown in FIG. 5, the bucket 12 in the standby position after the work W has been dispensed has the main body portion 12B deeply overlapped with the frame portion 12A by the force of the spring 16 to have a shallow bottom. When 1 is positioned at the plus 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, the hollow rectangular tubular frame body portion 25A has a bottomed rectangular tubular main body portion 2A.
5B is movably fitted, and the bottom 26a is constantly provided by the spring 26.
Urging so that it becomes shallower, the pin 27 causes the main body 25B
2 with a restricted movement range with respect to the frame body portion 25A
It may be 5.

[0020]

The work discharging device for a machine tool according to the present invention is configured as described above, and therefore has the following effects. When the bucket, which consists of members such as the frame and main body, is positioned at the workpiece receiving position below the chuck and the workpiece that falls after processing is received by the bucket, the main body resists the force of the spring due to the weight of the workpiece. When the work is discharged at the work discharge position, the bottom of the bucket becomes shallow and the machine waits as it is. It is possible to avoid the interference between the lower turret and the bucket on a lathe with a small gap between the tool and the cover, and by modifying the cover and increasing the number of blades without limiting the operating range of the moving body, one chuck can handle a complicated shape. This is a work unloading device that can be installed in recent machine tools that can be machined.

[Brief description of drawings]

FIG. 1 is an operation explanatory view showing the entire work unloading device of the present invention.

FIG. 2 is a front view of the bucket at a work payout position.

FIG. 3 is a side view of the bucket as seen from a direction perpendicular to the arrow line AA of FIG.

FIG. 4 is a perspective view of a lathe having a work unloading device.

FIG. 5 is an explanatory diagram showing a standby posture of the bucket that can avoid interference with the lower turret.

FIG. 6 is a diagram showing a bucket different from that in FIG. 2;

FIG. 7 is an explanatory diagram showing a state in which a work falls from a bucket during conveyance when a conventional shallow bucket is used.

[Explanation of symbols]

 1 Lower Turret 3 Headstock 4 Chuck 5 Cover 6 Swing Center Axis 8 Swing Arm 12,25 Bucket 12A, 25A Frame Body 12B, 25B Main Body 12a Circular Slot 15 Positioning Pin 16 Spring 18 Fluid Cylinder 22 Work storage box a Work receiving position b Work paying position W Work

Claims (1)

[Claims] 1. A work which drops a bucket provided at the end of a swing arm that is swingable around an axis parallel to the main axis of a machine tool for processing a work gripped by a chuck after the processing is completed and is in a substantially horizontal posture. In a work unloading device for alternately positioning a work receiving position below the chuck for receiving and a work discharging position for discharging the work out of the machine in a substantially vertical posture, the work unloading device is provided at the tip of the swing arm and is substantially vertically moved at the work receiving position. A hollow rectangular tube-shaped frame portion that is open to the inside, and is movably fitted to the frame body portion so that the bottom becomes shallower or deeper, and is always urged by a spring so that the bottom becomes shallower. The bucket is constituted by a bottom-cornered tubular main body and means for restricting the range of movement of the main body with respect to the frame body. A work unloading device for a machine tool, characterized in that the main body moves against the force of the spring so that the bottom becomes deeper.