JPH04300135A - Work positioning and dividing device - Google Patents

Abstract

PURPOSE:To carry out positioning and dividing of a work in a fully automatic way, to say nothing of carrying-in and out of a pallet, in a device to process a plural number of process faces of the work positioned and fixed on the pallet. CONSTITUTION:A pallet placing board 8 free to move in the longitudinal and the vertical directions orthogonal with a spindle axial line is set in front of a spindle head 2 and a pallet carry-in and out board 13 is set in the rear of it. A first pressure oil supply discharge joint with a check valve built in it is arranged on the pallet placing board 8, and a second pressure oil supply discharge joint 14 is also arranged on the pallet carry-in and out board 13. A jig 23 with a hydraulic chuck device 24 with a work holding claw free to open and close by pressure oil, capable of dividing rotation and provided with a hydraulic brake and a bracing device 31 opened and closed by a hydraulic cylinder is firmly set on a pallet 19. Additionally the pallet 19 is provided with a second pressure oil supply discharge joint 21 and a fourth pressure oil supply discharge joint, and each of them is devised free to connect to disconnect from the aforementioned second and first pressure oil supply discharge joints.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workpiece positioning and indexing device that is capable of automatically indexing positioning holes on a plurality of machined surfaces of a workpiece on a processing station.

0002

[Prior Art] Conventionally, when machining shafts with a machining center, two V bevels with reference keys were attached to the pallet on which the machine was installed, and the workpiece was placed on top of them, so that the axis of the workpiece was aligned with the pallet. Adjust the thickness of the spacer installed on the V bevel so that it is parallel to the top surface, and fix the workpiece against the V bevel using a clamping device consisting of a matsuba, bolt, and jack installed on the pallet. Multiple machining surfaces of the workpiece are machined using an NC program.

0003

[Problems to be Solved by the Invention] In the above conventional method, it is necessary to manually adjust the thickness of the spacer in order to position the workpiece placed on the V bevel parallel to the upper surface of the pallet.
The clamping device is also operated manually. Furthermore, when machining the surface of a workpiece that is held down by a clamping device, it is necessary to loosen the clamping device, rotate the workpiece at a required angle, and then re-clamp the workpiece.

0004

[Means for Solving the Problems] The present invention is a workpiece positioning and indexing device which has been made to solve the above-mentioned conventional problems. A pallet support stand that is movable and can be moved up and down, and a first pressure oil supply/discharge joint with a built-in check valve are arranged near the moving end of the pallet support stand in the left-right direction, and the pallet support stand is moved in the left-right direction. A pallet loading/unloading device installed at the rear of the loading table to carry the pallet in and out of the loading table, and a second pressure oil supply/discharge joint with a built-in check valve were arranged. a pallet loading/unloading table; a hydraulic chuck device having workpiece gripping claws that can be opened and closed by pressure oil, indexable and rotatable by an indexing motor, and equipped with a hydraulic brake that brakes the rotation; a steady rest device having a steady rest arm that contacts the outer peripheral surface of a workpiece gripped by a hydraulic chuck device; and a pallet that can be carried in and out by the pallet loading and unloading device between the pallet loading and unloading table and the mounting table. a jig fixedly installed on the pallet, the pallet is connectable to the second pressure oil supply/discharge joint disposed on the pallet loading/unloading table, and the hydraulic chuck device and the hydraulic cylinder of the steady rest device; A third pressure oil supply/discharge joint with a built-in check valve communicates therewith, and a fourth pressure oil supply/discharge joint with a built-in check valve connectable to the first pressure oil supply/discharge joint disposed on the mounting base and communicates with the hydraulic brake of the hydraulic chuck device. It is characterized by being provided with a supply/discharge joint.

[0005]

[Operation] With the above configuration, when a pallet is placed on the pallet loading/unloading table, the third pressure oil supply/discharge joint provided thereon is connected to the second pressure oil supply/discharge joint placed on the pallet loading/unloading table. The hydraulic chuck device and steady rest device on the pallet are automatically operated, the hydraulic chuck device grips the workpiece, the steady rest device puts it in a steady rest state, and in this state, the pallet is placed on the pallet support stand on the mounting table. After carrying it in and positioning it in front of the spindle head and machining the specified machining surface, the pallet support table is shifted to the side and the first pressure oil supply/discharge joint placed on the mounting table and the first pressure oil supply/discharge joint provided on the pallet are connected. Connect the fourth pressure oil supply/discharge joint connected to the hydraulic brake of the hydraulic chuck device, loosen the hydraulic brake, rotate the hydraulic chuck device with the indexing motor to index the machining surface of the workpiece, and apply the hydraulic pressure again. The brake is operated to position the indexed machining surface, and in this state, the pallet is shifted to a machining position in front of the spindle head to machine the indexed machining surface. Then, when all machining is completed, the pallet is transferred onto the pallet loading/unloading table, the hydraulic chuck device is loosened, and the steady rest device is released, allowing fully automatic exchange of processed workpieces and unprocessed workpieces. It is.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a processing unit, in which a spindle head 2 rotatably supports a spindle on which a tool 4 having a cutter 5 is mounted, and is provided so as to be movable up and down by a vertical motor 3, and is exchangeably mounted on the spindle. It is equipped with a tool magazine 6 for storing a large number of tools to be used, and a tool exchange arm 7. This processing unit 1 is moved forward and backward by a motor located at the rear side.

Reference numeral 8 denotes a pallet mounting table installed in front of the processing unit 1. As shown in FIGS. 2 and 7, a pallet support stand 9 for guiding and supporting the pallet 19 is provided on the pallet mounting stand 8 so as to be movable in the left and right directions orthogonal to the spindle axis, and also to be movable in the vertical direction. It is being 10 is a ball screw that moves the pallet support base 9 left and right, and 11 is a ball screw motor that rotates the ball screw 10 in forward and reverse directions.

Reference numeral 13 denotes a pallet loading/unloading table which is installed behind the pallet loading table 8 and has a pallet 19 placed thereon. The pallet loading/unloading table 13 is provided with a pallet loading/unloading device 15 as shown in FIG. This pallet loading/unloading device 15 is composed of a pallet loading/unloading cylinder 16 oriented in the direction of the main shaft axis, a rod 17 that is moved forward and backward by the pallet loading/unloading cylinder 16, and an engaging pawl 18 fixed to the rod 17. The pallet 19 is provided with an engaging member 20 with which the engaging claw 18 engages.

[0009] The pallet 19 has third and fourth pressure oil supply/discharge joints 21 with built-in check valves at two different positions.
. A second pressure oil supply/discharge joint 14 having a built-in check valve coupled to a third pressure oil supply/discharge joint 21 provided on the pallet 19 is disposed on the pallet loading/unloading table 13.

Furthermore, a jig 23 is integrally fixed on the pallet 19 as shown in FIG. This jig 2
3 is composed of upper and lower hydraulic chuck devices 24 and, as shown in FIG. 6, steady rest devices 31 disposed on the sides of each chuck device 24. Note that the hydraulic chuck device 24 is not limited to two stages, upper and lower;
It may be one stage or two or more stages.

The hydraulic chuck device 24 includes a rotary table 25
The rotary table 25 is composed of a plurality of workpiece gripping claws 26 that move forward and backward in the radial direction to open and close using a hydraulically actuated mechanism, and an indexing motor 27 that indexes and rotates the rotary table 25 at an arbitrary rotation angle. Although not shown in the drawings, the rotary table 25 is provided with a brake drum, and is equipped with a hydraulic brake that performs rotational braking using pressure oil.

As shown in FIG. 5, the hydraulic mechanism for opening and closing the workpiece gripping claw 26 has a cylinder chamber 28 in the rotary table 25.
A piston 29 is fitted into the cylinder chamber 28 so as to be movable forward and backward, and a wedge member 30, which is moved forward and backward by the piston 29, is fitted onto the workpiece gripping claw 26 with a tapered surface.

As shown in FIG. 6, the structure of the steady rest device 31 includes a roller 30 that contacts two points above and below the outer circumferential surface of the workpiece W held by the hydraulic chuck device 24, and is constantly supported by a return spring 31. A pair of steady rest arms 32 biased in the opening direction are provided so as to be able to open and close using a support shaft 33 as a fulcrum, and a T-shaped rod 35 is moved forward and backward by a cylinder 34 for opening and closing the steady rest arms. A roller 36 is provided that contacts the side surface of the outer peripheral surface of the workpiece W,
It has a structure in which rollers 37 are provided at both ends of the left and right shafts to abut against a tapered cam surface 39 formed at the rear end of the steady rest arm 32.

The fourth pressure oil supply/discharge joint 22 provided on the pallet 19 is communicated with the hydraulic brake of the rotary table 25 of the hydraulic chuck device 24 via an oil passage, and is connected to the third pressure oil supply at the other position. The exhaust joint 21 communicates with the cylinder chamber 28 of the hydraulic chuck device 24, the hydraulic brake, and the steady rest arm opening/closing cylinder 34 through oil passages. Note that the indexing motor 27 is an electric servo motor.

Next, the operation of the present invention constructed as described above will be explained. On the pallet loading/unloading table 13, a hoist automatically exchanges processed workpieces and unprocessed workpieces on the jig 23 on the pallet 19 that has been carried out. That is, the pallet 19 on the pallet loading/unloading table 13 is connected to the second pressurized oil supplying/discharging joint 14 where the third pressure oil supply/discharging joint 21 at the other position is arranged on the pallet loading/unloading table 13.
a cylinder chamber 28 of the hydraulic chuck device 24 coupled to the
By discharging the hydraulic brake and the pressure oil sealed in the steady rest arm opening/closing cylinder 34, the workpiece gripping claw 26 opens, the hydraulic brake is released, the steady rest arm 32 opens, and the machined workpiece is removed. is in a free state, is taken out from the jig 23 by a hoist, and the unprocessed workpiece is set on the hydraulic chuck device 24.

Next, pressure oil is supplied to the cylinder chamber 28 of the hydraulic chuck device 24, the hydraulic brake, and the steady rest arm opening/closing cylinder 34, and the workpiece gripping claws 26 are closed to firmly grip the workpiece W. The rotation of the rotary table 25 is locked by a hydraulic brake, and the workpiece W is brought into a steady rest state by the steady rest device 31. In this state, the pallet loading/unloading device 15 loads the pallet 19 onto the pallet mounting table 8, and supports the pallet 19 on the pallet supporting table 9. Note that when the pallet 19 is moved from the pallet loading/unloading table 13, the third pressure oil supply/discharge joint 21 at the other position is separated from the first pressure oil supply/discharge joint 12 of the pallet loading/unloading table 13, but the built-in check valve is closed. Therefore, the pressure oil supplied to the cylinder chamber 28 of the hydraulic chuck device 24, the hydraulic brake, and the steady rest arm opening/closing cylinder 34 is sealed and the above-mentioned state is maintained.

The pallet support stand 9 is lowered by its built-in cylinder. After that, the pallet loading/unloading device 15
The rod 17 is moved back toward the pallet loading/unloading table 13. The pallet support stand 9 supporting the pallet 19 is shifted to the left in FIG. W is processed at predetermined processing locations using an NC program. If the hydraulic chuck device 24 has two stages, upper and lower, as shown in the figure, when machining of a predetermined part of the workpiece W on the upper stage is completed, the vertical motor 3 lowers the spindle head 2 to move the workpiece W on the lower stage. Position it in correspondence with the main shaft.

When the machining of the predetermined portion is completed, the pallet support stand 9 is shifted to the right end in FIG. 2. This results in
One fourth pressure oil supply/discharge joint 22 provided on the pallet 19 is coupled to the first pressure oil supply/discharge joint 12 disposed on the pallet mounting table 8, as shown in FIG. Here, the pressure oil contained in the hydraulic brake is discharged, the hydraulic brake is loosened, the rotary table 25 of the hydraulic chuck device 24 is made rotatable, and the workpiece W held by the hydraulic chuck device 24 is split. The rotation of the rotary table 25 is locked by indexing at a desired angle by the output motor 27, pressure oil is supplied to the hydraulic brake again, and then the pallet support table 9 is shifted to the left to process the indexed position. be.

When the above operations are repeated as necessary and all processing is completed, the pallet support stand 9 is moved to the pallet loading/unloading table 13.
Shift the rod 17 to the position corresponding to the pallet mounting table 8. In this state, the pallet support table 9 is raised by the built-in cylinder, and the engaging member 20 is moved to the position corresponding to the engaging claw 1.
8, the pallet 19 is carried out onto the pallet loading/unloading table 13, and the above-described workpiece exchange operation is performed.

[0020]

Effects of the Invention As described above, the present invention provides a hydraulic chuck device which can index and rotate on a pallet carried in and out between a pallet loading/unloading table and a loading table, and which can be rotationally locked by a hydraulic brake. The hydraulic chuck device, hydraulic brake, and steady rest device are integrated into one body, and the hydraulic chuck device, hydraulic brake, and steady rest device are connected to a pressure oil supply/discharge joint with a built-in check valve that is quick-jointed on the pallet loading/unloading platform. In addition, the hydraulic brake is controlled on the mounting table so that the workpiece gripped by the hydraulic chuck device can be indexed and positioned by the indexing device, so all machining can be done in one setup. It has the advantage of enabling fully automatic, unmanned continuous processing.

[Brief explanation of drawings]

[Figure 1] Overall diagram of the present invention

[Figure 2] Plan view explaining the operation of the pallet

[Figure 3] A plan view showing the connection state between the pressure oil supply and discharge joint of the pallet and the pressure oil supply and discharge joint of the mounting table.

[Figure 4] Front view showing a jig integrated with a pallet

[Figure 5] Cross-sectional view of the hydraulic operating mechanism of the workpiece gripping claw of the hydraulic chuck device

[Figure 6] Front view of a jig with a steady rest equipped with a steady rest device

[Figure 7] Side view of the pallet and jig on the pallet mounting table

[Explanation of symbols]

1 Processing unit 2 Spindle head 4 Tools 8　Placement stand 9 Pallet support stand 12 First pressure oil supply and discharge joint 13 Pallet loading/unloading table 14 Second pressure oil supply and discharge joint 15　Pallet loading/unloading device 19 Palette 21 3rd pressure oil supply and discharge joint 22 4th pressure oil supply and discharge joint 23 Jig 24 Hydraulic chuck device 25 Turntable 26 Workpiece gripping claw 27 Index motor 31 Steady rest device 32 Steady rest arm

Claims (1)

[Claims] Claim 1: A pallet support that is installed in front of the spindle head and is movable in the left and right directions perpendicular to the spindle axis and can be moved up and down, and a check valve is built in near the end of the pallet support in the left and right direction. a mounting table on which a first pressurized oil supply/discharge joint is disposed and on which the pallet support stand is placed so as to be movable in the left-right direction; and a pallet loading table installed at the rear of the mounting table for carrying the pallet into and out of the loading table. It has a pallet loading/unloading table on which a second pressurized oil supply/discharge joint with a built-in check valve is arranged, and a workpiece gripping claw that can be opened and closed by pressure oil, and can be indexed and rotated by an indexing motor. The pallet further includes a hydraulic chuck device equipped with a hydraulic brake for rotational braking, and a steady rest device equipped with a steady rest arm that is opened and closed by a hydraulic cylinder and comes into contact with the outer peripheral surface of a workpiece gripped by the hydraulic chuck device. and a jig fixedly installed on a pallet that can be loaded and unloaded by the pallet loading/unloading device between the loading/unloading table and the loading table, and the second pressure oil disposed on the pallet loading/unloading table is attached to the pallet. A third pressure oil supply and discharge joint with a built-in check valve that is connectable to the hydraulic chuck device and the hydraulic cylinder of the steady rest device and that is connectable to the first pressure oil supply and discharge joint arranged on the mounting base. A workpiece positioning and indexing device characterized in that it is provided with a fourth pressure oil supply/discharge joint which is possible and has a built-in check valve that communicates with the hydraulic brake of the hydraulic chuck device.