Work Reversing Device

Abstract

To provide a workpiece flipping device which simplifies set-up change performed when processing of a workpiece ends.SOLUTION: A workpiece flipping device includes a flipping hand 9 which is supported by a base plate 21 in a manner that enables revolving and holds a workpiece. The base plate 21 comprises: a rear base plate 22 supported by a machine base; and a front base plate 23 by which the flipping hand 9 is supported. The front base plate 23 may move to a rear position where the workpiece is supported by the flipping hand 9 and a front position where set-up change is performed in front of the rear position.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a work reversing device for reversing a work on a machine tool in order to sequentially machine the front and back surfaces of the work in a machine tool having two parallel main spindles.

Background Art

[0002] For example, in a lathe with a single main spindle, when machining the front and back of a work, after machining the front side, it is necessary to once remove the work from the chuck, reverse it, and reattach it to the chuck. Since machining is not performed during this period, it is not efficient, so a lathe with two parallel main spindles has been proposed. According to such a machine tool having two parallel main spindles, the machining stop time can be reduced by machining only the front side with one main spindle and only the back side with the other main spindle.

[0003] In a machine tool such as a lathe with two parallel main spindles, the work is automatically transported by a loader, and therefore, a reversing device for reversing the work is used in combination (such as Patent Document 1).

[0004] Figs. 3 and 4 show an example of a conventional work reversing device used in a machine tool such as a lathe with two parallel main spindles.

[0005] The machine tool (1) has a beam (2) fixed to the left and right pedestals (1a) and (1b) so as to be located above a lathe with two parallel main spindles. A loader (3) is provided on this beam (2) so as to be able to traverse and move up and down. The work reversing device (4) is arranged outside the machining chamber above the main spindle in order to shorten the tact time, and is attached to the beam (2) in a hanging manner.

[0006] The workpiece inversion device (4) includes an I - beam (5) as a support member fixed to the lower surface of the beam (2), a left inversion hand (7) supported via a left rotation shaft (6) arranged on the left part of the I - beam (5), and a right inversion hand (9) supported via a right rotation shaft (8) arranged on the right part of the I - beam (5). The left and right inversion hands (7)(9) are each provided with three claws (7a)(9a) that can move radially from the center of the inversion hands (7)(9) and hold the workpiece.

[0007] The left rotation shaft (6) is rotatably supported by a left base plate (10) and is rotated by a left rotation cylinder (11). The right rotation shaft (8) is rotatably supported by a right base plate (12) and is rotated by a right rotation cylinder (13).

[0008] The position of the left base plate (10) is fixed, and the right base plate (12) is supported by a guide (14) fixed to the I - beam (5) so as to be movable in the left - right direction and is linearly moved in the left - right direction by a linear motion cylinder (15). Thereby, the distance between the left and right inversion hands (7)(9) can be adjusted. A linear motion stopper (16) for stopping the leftward movement of the right base plate (12) is provided on the left base plate (10).

[0009] When inverting the workpiece from left to right with such a workpiece inversion device (4), the left inversion hand (7) holding the workpiece rotates 90° so as to face the right inversion hand (9) from a direction parallel to the main shaft, then the right inversion hand (9) rotates 90° so as to face the left inversion hand (7) from a direction parallel to the main shaft, then the right inversion hand (9) advances toward the left inversion hand (7) side to grip the workpiece, then the left inversion hand (7) releases the workpiece and retreats, then the right inversion hand (9) rotates 90° to be in a direction parallel to the main shaft to release the workpiece. Thus, the inversion operation is completed.

Prior Art Documents

Patent Documents

[0010]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0011] In a work inversion device, due to the need to grip the work, when the work changes, replacement of parts such as the pawl holder occurs. However, in the above conventional work inversion device, since this is arranged outside the processing chamber above the main shaft, the inversion hand is in a position that is difficult to reach, and there is a problem that the workability of replacement is poor.

[0012] An object of the present invention is to provide a work inversion device that simplifies the replacement work when the processing of the work is completed.

Means for Solving the Problems

[0013] A work inversion device according to the present invention is a work inversion device including a base plate supported by a machine base and an inversion hand rotatably supported by the base plate for holding a work, wherein the base plate is composed of a rear base plate supported by the machine base and a front base plate on which the inversion hand is supported, and the front base plate is movable to a rear position where the work can be supported by the inversion hand and a front position where replacement work is performed in front of the rear position.

[0014] Note that regarding the front and rear sides, the front side refers to the side closer to the operator, and the rear side refers to the side farther from the operator. Accordingly, when the work is inverted, the advancing and retracting direction of the inversion hand is defined as the left - right direction. Therefore, according to the work inversion device of this invention, the inversion hand can move (be pulled out forward) in the front - rear direction, which is perpendicular to the advancing and retracting direction (left - right direction) when the inversion hand inverts the work. So, when the processing of the work is completed and the shape of the next work to be processed is changed, making it necessary to replace parts such as the claw pads attached to the inversion hand, it is possible to pull out the inversion hand to perform the work, and the replacement work can be made simple.

[0015] The work inversion device preferably includes a fixed guide plate fixed to the rear - side base plate, a movable guide plate fixed to the front - side base plate and movable integrally with the front - side base plate, and a guide shaft having one end fixed to the movable guide plate and the other - end portion inserted movably in a certain direction into the fixed guide plate. Front and back In this way, the configuration that enables the front - side base plate to move between a rear position and a front position can be made simple and easy to handle.

[0016] In this way, the configuration that enables the front - side base plate to move between a rear position and a front position can be made simple and easy to handle.

[0017] The work inversion device preferably further includes an inverted - L - shaped connecting fitting fixed to the rear - side base plate, an alignment member for aligning the connecting fitting and the front - side base plate, and a fastening fitting for fastening the connecting fitting and the front - side base plate.

[0018] In this way, at the rear position where the work can be supported by the inversion hand, the front - side base plate can be accurately positioned, and the work can be supported by the inversion hand with high precision.

Advantages of the Invention

[0019] According to the workpiece inversion device of the present invention, in the workpiece inversion device which is arranged outside the processing chamber above the main shaft and has the problem that the setup change work is difficult, since the setup change work can be performed after moving the inversion hand forward, the setup change work can be made easier.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0021] Hereinafter, with reference to the drawings, one embodiment of the workpiece inversion device of the present invention will be described. In the following description, the left in FIGS. 1 and 2 is taken as the front and the right as the rear.

[0022] FIGS. 1 and 2 are views showing the workpiece inversion device (20) of the present invention. FIG. 1 shows the state during workpiece processing, and FIG. 2 shows the state during setup change.

[0023] Although FIG. 1 corresponds to the conventional right inversion hand (9) shown in FIG. 4, on the left inversion hand (7) side, only the linear motion cylinder (15) is replaced with the linear motion stopper (16), and basically the configurations on the left and right are the same. Therefore, hereinafter, without distinguishing between the left and right, it will be simply described as the inversion hand (9). In addition, the same reference numerals are given to the same configurations as those in the conventional case.

[0024] The workpiece reversing device (20) includes an ikegai (5) as a support member fixed to the lower surface of the beam (2), a reversing hand (9) supported via a pivot shaft (8), and a base plate (21) that supports the reversing hand (9).

[0025] The base plate (21) is composed of a rear base plate (22) supported by the ikegai (5) and a front base plate (23) that supports the reversing hand (9).

[0026] The front base plate (23) is integrated with the rear base plate (22) and can move to a rear position (the position shown in FIG. 1) where the workpiece can be supported by the reversing hand (9) and a front position (the position shown in FIG. 2) moved forward from the rear position (where the claws (9a) attached to the reversing hand (9) can be adjusted).

[0027] The pivot shaft (8) is pivotally supported by the front base plate (23) and is pivoted by a pivot cylinder (13).

[0028] The workpiece reversing device (20) is configured to be able to move the front base plate (23) between a rear position and a front position, and includes a vertical fixed guide plate (24) fixed near the rear end of the rear base plate (22), a vertical movable guide plate (25) fixed to the rear end of the front base plate (23) and movable integrally with the front base plate (23), and a guide shaft (26) whose front end is inserted and fixed to the lower end of the movable guide plate (25) and whose middle to rear end portion is inserted into the fixed guide plate (24) so as to be movable in the front-rear direction.

[0029] The workpiece reversing device (20) further has a configuration in which the front base plate (23) and the rear base plate (22) are integrated, and is in an inverted L shape composed of a horizontal portion and a vertical portion extending downward from the rear end thereof, and the upper end portion of the vertical portion is fixed to the front end face of the rear base plate (22). It also includes a connecting fitting (27), a plunger pin (alignment member) (28) for aligning the horizontal portion of the connecting fitting (27) with the front base plate (23), and fixing bolts (fastening fittings) (29) arranged to sandwich the plunger pin (28) from left and right to fasten the horizontal portion of the connecting fitting (27) and the front base plate (23).

[0030] According to the machine tool equipped with the workpiece reversing device (20) of the above embodiment, when the workpiece reversing device (20) is in the state shown in FIG. 1, the workpiece is machined. As a result, after machining the surface of the workpiece, the workpiece can be reversed by the workpiece reversing device (20) to machine the back surface of the workpiece, enabling efficient machining.

[0031] When the machining of the workpiece is completed, setup changes such as changing the pawl stop are required to machine the next workpiece. In a conventional workpiece reversing device, this setup change is performed at the position shown in FIG. 4. As shown in FIG. 3, the workpiece reversing device (4) is arranged outside the machining chamber above the main shaft, so it is difficult to reach the reversing hand (9), and there is a problem that the setup change work is difficult. In contrast, according to the workpiece reversing device (20) of the above embodiment, the setup change can be performed by changing the state from the state where the front base plate (23) shown in FIG. 1 is integrated with the rear base plate (22) to the state where the front base plate (23) shown in FIG. 2 moves forward with respect to the rear base plate (22).

[0032] To change from the state shown in FIG. 1 to the state shown in FIG. 2, the operator only needs to remove the fixing bolt (29) fastening the connecting fitting (27) and the front base plate (23), and further push down the plunger pin (28) to move the rear base plate (22) forward. In this way, the reversing hand (9) moves to the forward position, making the setup change work easier.

[0033] To return from the state shown in Fig. 2 to the state shown in Fig. 1, the reverse operation may be performed. Alignment is achieved by inserting the tip of the plunger pin (28) into the pin insertion hole provided in the rear base plate (22). In this state, the fixing bolt (29) is inserted into the bolt insertion holes provided in the rear base plate (22) and the connecting fitting (27) respectively, and the rear base plate (22) and the connecting fitting (27) may be fastened by the fixing bolt (29). Thus, the reversing hand (9) is accurately aligned at the rear position, and the reversing operation of the workpiece can be performed with high precision.

[0034] Note that the configuration in which the front base plate (23) is movable between the rear position and the front position and the configuration in which the front base plate (23) and the rear base plate (22) are integrated are not limited to those shown in the drawings, and may be appropriate configurations.

Explanation of Signs

[0035] (20): Work reversing device (9): Reversing hand (21): Base plate (22): Rear base plate (23): Front base plate (24): Fixed guide plate (25): Movable guide plate (26): Guide shaft (27): Connecting fitting (28): Plunger pin (positioning member) (29): Fixing bolt (fastening member)

Claims

1. In a workpiece reversing device comprising a base plate supported by a machine tool and a reversing hand rotatably supported by the base plate for holding a workpiece, the base plate consists of a rear base plate supported by the machine tool and a front base plate on which the reversing hand is supported, and the front base plate is movable between a rear position where the workpiece can be supported by the reversing hand and a front position where setup change work is performed in front of the rear position. A workpiece reversing device characterized by this.

2. The workpiece reversing device according to claim 1, further comprising a fixed guide plate fixed to the rear base plate, a movable guide plate fixed to the front base plate and movable integrally with the front base plate, and a guide shaft having one end fixed to the movable guide plate and the other end portion inserted through the fixed guide plate so as to be movable in the front-rear direction.

3. The workpiece reversing device according to claim 1 or 2, further comprising an inverted L-shaped connecting fitting fixed to the rear base plate, an alignment member for aligning the connecting fitting and the front base plate, and a fastening fitting for fastening the connecting fitting and the front base plate.

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