JPH027785B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for performing steady rest, loading, and unloading using a self-aligning steady rest device in a lathe.

Prior Art Conventionally, in the automation specifications for parts machining that require a steady rest when machining shaft workpieces, an automatic steady rest device was used as the steady rest, and a loader device used for changing workpieces was used exclusively for loading and unloading workpieces.

Problems to be Solved by the Invention For this reason, multiple devices are required, and there are structural restrictions to prevent interference between the devices.Furthermore, since the next operation cannot be performed until one device is evacuated, it is necessary to evacuate the steady rest. There was an inconvenience that tool changes were performed in series, which increased the workpiece change time.

Means for Solving the Problem A pivot shaft 13 is provided at a position opposite to the tool post 6 so as to be pivotable parallel to the axis of the workpiece;
A twin-arm self-centering steady rest member 16 that can move above and rotate integrally and has symmetrical gripping parts.
a, 16b, a rotating shaft driving means 14 for rotating the workpiece gripped by the steady rest members 16a, 16b to the processing position and the delivery position, and the steady rest member 16.
Means 19, 20 for moving the steady rest members 16a, 16b in the axial direction in order to insert and pull out the workpiece gripped by the chucks 7a and 16b, and means 17 for fixing the steady rest members 16a, 16b in the steady rest operating position. , 18 and a brake means for stopping the rotation of the workpiece.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. A saddle 3 that can be slid in the Z-axis direction is placed on the horizontal guide surface 2 on the bed 1, and a cross-travel table 4 is placed on top of the saddle 3 so that it can be moved in the X-axis direction. Turret 6 that rotates around the Z axis
is fixed. In addition, a chuck 7 is mounted on the main shaft supported on the headstock on the bed 1, and a tailstock shaft 8 is mounted on the tailstock.
is provided with a center 9, which is well known. Stands 11, 11 are established on this bed 1 at positions facing the tool rest 6, and bearings 12,
A rotating shaft 13 with a spline cut thereon is rotatably supported by a rotating shaft 12, and is rotatably connected to the output shaft of a rotating cylinder 14 attached to a stand 11 with a key so that it can be rotated forward or backward by 180 degrees. .
A steady rest mounting arm 15 spline-fitted onto the spline of the rotating shaft 13 is provided so as to be movable in the axial direction, and self-aligning roller steady rests 16a, 16
b is installed. A known self-aligning roller steady rest is used, for example, as shown in Figure 1a of Japanese Patent Publication No. 47-29836. This device has a roller end that serves as a support point for the workpiece, an angle-shaped cam is fixed in the middle, and the shaft end is connected to the piston of the cylinder mechanism to create a center steady rest that can be moved in the axial direction. The end of the steady rest rod, which has a roller end that handles two points of three-point gripping and rotates at a central pivot point, is kept in constant contact with the angle-shaped cam, and is opened and closed by the same amount as the central steady rest rod advances and retreats. The format is A positioning pawl clutch 17 is installed concentrically with the pivot axis on each side of the steady rest mounting arm 15, and a positioning pawl clutch 18 and a steady rest 16 are mounted on opposite sides of the stand 11, concentrically with the pivot axis 13.
a and 16b are designed to mesh with each other at a position where the workpiece is supported with a steady rest. Furthermore, a cylinder 19 is attached to the other side of the steady rest mounting arm 15 concentrically with the pivot axis, and a piston 20 fitted into this cylinder 19 is fixed to the pivot shaft 13. Accordingly, by sending pressure fluid to either the front or rear chambers of this cylinder 19, the mounting arm 15 moves, and the pawl clutches 17, 18 are engaged at one end of the movement. Further, cylinders 21a and 21b are attached to the steady rest mounting arm 15 in parallel with the steady rests 16a and 16b, respectively, with their axes facing toward the workpiece gripped by the steady rests, in order to stop the rotation of the workpiece. Piston rods 23a and 23b projecting outward from pistons 22a and 22b fitted into the cylinders 21a and 21b are designed to come into pressure contact with the workpiece and stop their rotation.

Operation: The steady rest 16a grips the workpiece gripped between the chuck 7 and the center 9, and the claw clutches 17, 18
is the piston rod 23a fixed in the meshing position.
is retracted, and when a command is given to change the workpiece upon completion of cutting, the tool rest 6 is retracted and the cylinder 2 is
Pressure fluid is sent to the rear chamber 1a and the piston rod 2
3a protrudes and presses against the workpiece to stop its rotation. The other steady rest 16 that was open at the same time
b closes to grasp the workpiece being sent by a conveyor or the like to the front position of the lathe. Open chuck 7's claw,
The tailstock shaft 8 is moved backward. Pressure fluid is sent to the chamber on the tailstock side of the cylinder 19, and the cylinder 19 and the mounting arm 1
5 to the tailstock side and tighten the pawl clutches 17 and 18.
When the mesh of the chuck 7 is released, the workpiece is pulled out from the chuck 7. Pressure fluid is sent to the swing cylinder 14, and the swing axis 13 and the steady rest mounting arm 15 are rotated 180 degrees to bring the machined workpiece held by the steady rest 16a to the delivery position, and a new workpiece held by the steady rest 16b is transferred. Transport objects to respective processing positions. When pressure fluid is sent to the chamber on the main shaft side of the cylinder 19 and the cylinder 19 and the mounting arm 15 are moved to the main shaft side and a workpiece is inserted into the chuck 7, the claw clutch 17,
18 and move the tailstock shaft 8 forward to move the center 9
Grip with. The steady rest 16a is opened and the workpiece is transferred onto the conveyor. With the steady rest 16b acting, the tool rest 6 is moved in the X and Z axis directions, and cutting is performed with the tool. In this embodiment, the pivot shaft is integrated with the mounting arm 15, and the mounting arm 15 can be freely pivoted by the pivot cylinder 14.

Effects As detailed above, according to the present invention, the steady rest member is provided so as to be movable in the axial direction and can be rotated to perform a loading action, thereby preventing interference between the steady rest member and the loading device. If this is completely eliminated and the design becomes easier, there will be no need to perform a loading operation after retracting the steady rest, which will shorten the workpiece exchange time. Additionally, the device becomes a single device, which has the effect of reducing costs. Also, the steady rest's centering function allows it to be supported without bending during processing. Further, since the rotation and axial movement of the workpiece is restrained by the brake means, accurate loading and unloading operations can be performed.

[Brief explanation of drawings]

FIG. 1 is an explanatory longitudinal cross-sectional view of the present device, and FIG. 2 is an explanatory side view. 6...Turret post, 7...Chuck, 8...Tailstock spindle, 13...Swivel axis, 14...Swivel cylinder, 1
5... Steady rest mounting arm, 16a, 16b... Steady rest, 19, 21a, 21b... Cylinder, 2
0, 22a, 22b...Piston.

Claims (1)

[Claims] 1. A twin arm self-aligning type that is installed on the bed of the lathe at a position facing the tool rest and capable of rotating around an axis parallel to the workpiece axis and movable in the direction of the turning axis, and having symmetrical gripping parts. a steady rest member; a driving means for rotating the steady rest member to rotate the workpiece gripped by the steady rest member to a loading position and an unloading position; means for moving the steady rest member in the axial direction for insertion and withdrawal; means for fixing the steady rest member at a steady rest position of the workpiece; and means provided in parallel with the steady rest member to prevent rotation of the workpiece after machining. A loading device with a steady rest function, which is equipped with a braking means for