JPS6034432Y2 - Workpiece loading/unloading device for machine tools - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a workpiece loading/unloading device for a machine tool, and particularly to a workpiece loading/unloading device for loading/unloading a workpiece to/from a processing position in a rolling machine.

As a conventional work loading/unloading device for a machine tool, there is one shown in FIG.

To explain this simply, an overarm 2 is extended from the upper part of the rolling machine main body 1, and a guide rail 3 extending in the workpiece loading/unloading direction is attached to the overarm 2.

A slider 4 with a tail stock 5 integrated therein is slidably provided on the guide rail 3, and its rear end is fixed to a bracket 7 fixed to the rod end of a hydraulic cylinder 6 serving as an actuator.

The tailstock 5 includes a rotation center 8.

At the rear end and front end of the guide rail 3, a stopper 9 for the rearward limit of the tail stock 5 and a stopper 10 for the forward limit when there is no workpiece are provided, respectively.

On the other hand, a sliding device 11 is provided on the bed 100 in parallel with the guide rail 3 to slide the work rest 12 in the workpiece loading/unloading direction.

In such a conventional workpiece loading/unloading device, a workpiece W such as a shaft housing, which has been transported by a lift-and-carry complete conveyor, is placed on a workpiece rest 12 of a sliding device 11 and driven by a hydraulic cylinder 6. It is pushed by the rotation center 8 of the tail stock 5 and carried to the processing position, and is centered by the head center 20 and the rotation center 8.

Then, the main slide base 21 is operated, and the tool 23 held by the tool holder 22 performs the rolling process.

When machining is completed, the tail stock 5 is placed on the work rest 1.
2 to a predetermined position between the forward and backward limits, and after the work W is carried out by the lift carry conveyor, the workpiece W is retreated to the illustrated backward limit position.

However, in such a conventional workpiece loading/unloading device, the movement of the workpiece depends on the movement of the actuator, so especially at the intermediate position of the forward and backward limit of the tailstock, the frictional resistance changes depending on the operating conditions. As a result, stopping accuracy was unstable, and in some cases, the workpiece could fall from the work rest.

Furthermore, in order to set the work from the conveyor onto the work rest, it is necessary to carry in and take out the work from the side, so a large-scale device is required for accurate setting.

This idea was made in order to solve the conventional problems as mentioned above, and the workpiece is centered, held, carried in and out by fitting the center and the workpiece, and the workpiece is securely held at a predetermined position. The object of the present invention is to provide a device for loading and unloading workpieces in a machine tool, which can receive and discharge workpieces at the same time.

Hereinafter, an embodiment of this invention will be described with reference to FIGS. 2 and 3 of the attached drawings. The same parts as in FIG. Omitted.

First, to explain the configuration of this embodiment, as shown in FIG. Work holding fitting part 18b that fits into the hole
A rotation center 18 is installed.

In addition, this tail stock 15 has a workpiece W at the tip.
A slide par 26 provided with a work rest 25 serving as a positioning member that engages with and regulates its position is slidably held.

A bracket 28 having a stopper 27 mounted thereon is fixed to the guide rail 3.

On the other hand, 30 is a free flow conveyor, which conveys the pallet 31 together with the work W.

A lifter 32 lifts the pallet 31 on which the workpiece W is placed to a processing height.

Next, details of the tail stock 15 and slide par 26 will be explained with reference to FIG.

A bush 33 is fixed to the tail stock 15 and restricts the rotation of a slide par 26, which is a spline shaft and fits into the bush 33.

A collar 34 for preventing removal is fixed to the slide par 26.

A spring 36 is compressed between the rear end flange 33a of the bush 33 and a washer 35 fixed to the rear end of the slide par 26 with a nut, so that the slide par 26 can be constantly moved against the tail stock 15 to carry out the workpiece. direction (direction of arrow B).

A tapered sleeve 37 is also fixed to the tail stock 15, and the rotation center 25 is fitted and held in this tapered sleeve.

Next, the operation of this embodiment will be explained.

First, a workpiece W placed on a pallet 31 is conveyed in a fixed direction by a free flow conveyor 30 shown in FIG.

The pallet 31 that has been transported to a predetermined position is lifted to a processing height by a lifter 32.

At this time, the tail stock 15 is in the retracted position, and the rear end of the slide par 26 abuts against the stopper 27 to be regulated at a predetermined position.

Therefore, the workpiece W fits into the workpiece rest 25 and is regulated in the axial direction.

Next, the tail stock 15 advances to the intermediate advance limit position by the operation of the hydraulic cylinder 6, and stops with the center portion 18a and the fitting portion 18b of the rotation center 18 fitted into the hole Wa of the workpiece W.

Thereby, the vertical direction of the workpiece W is also regulated.

In this state, the position of the work rest 25 remains the same as when the tail stock 15 was at the rearward limit position, and the spring 3
6 has been extended only for the purpose of moving the tail stock 15.

Next, the lifter 32 is activated and moves down together with the pallet 31 to the intermediate lowering limit position.

Then, when the tail stock 15 moves forward, the spring 36 further extends, and when the collar 34 fixed to the slide par 26 hits the front end flange 33b of the bush 33 (see FIG. 3), the slide par 26 moves to the stopper 27.
The workpiece W moves forward as one body while keeping the workpiece W regulated and held by the workpiece rest 25 and the rotation center 18, and at the forward limit of the tail stock 15, the workpiece W is at the machining position shown by the imaginary line in FIG. It will be brought in.

When centering is completed, the main slide base 21
is activated to perform the above-described rolling process.

After the machining is completed, the hydraulic cylinder 6 is operated to retract the tailstock 15 to the intermediate retraction limit position and stop it at the same position as when the workpiece was carried in.

At this time, the slide par 26 also retreats together, but its rear end contacts the stopper 27 and stops, so even if there is an error in the stroke of the hydraulic cylinder 6, the work rest 26
High accuracy can be obtained at the stopping position.

Next, the lifter 32 is activated, raises the empty pallet 31 again, and places the workpiece W on the pallet 31.

Then, when the tail stock 15 further retreats and stops at the backward limit position, the center portion 18a and the fitting portion 18b of the rotation center 18 are completely removed from the workpiece W.

Then, the lifter 32 descends all at once to above the free flow conveyor 30 with the processed work W placed on the pallet 31.

Then, the processed work is carried out, and the unprocessed work is carried onto the lifter 32.

By repeating such a cycle, the workpiece is continuously carried into the processing position, processed, and carried out.

Although this embodiment has been described with respect to a rolling machine, this invention can be similarly applied to a polling machine and the like.

As described above with respect to the embodiments, according to the present invention, the stopper always comes into contact with the slide bar that is biased in the direction of carrying out the workpiece, regardless of the stop position of the tailstock driven by an actuator such as a hydraulic cylinder. Since the stop position of the work rest is regulated by the above, it is possible to always maintain the loading/unloading position of the workpiece with high precision without being affected by changes in oil temperature, frictional resistance, etc.

Furthermore, since the work can be set directly from the conveyor onto the work rest, it can be done with a simple device.

Furthermore, it is possible to reduce the cost of equipment and shorten the workpiece transport time, making it possible to shorten the machining cycle.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an example of a work loading/unloading device in a conventional machine tool, Fig. 2 is a diagram similar to Fig. 1 showing an embodiment of this invention, and Fig. 3 is a diagram similar to Fig. 2. FIG. 2 is a sectional view taken along line A-A of FIG. 1... Main body of the rolling machine as a machine tool, 2.
...Over arm, 3...Guide rail, 4...Slider, 5.15...Tail stock, 6...Hydraulic cylinder, 8 ,18・
...Rotation center, 9, 10.27...Stopper, 25...Work rest, W...
・Work, 26...Slide bar.

Claims (1)

[Scope of utility model registration request] Guided by guide rails extending in the direction of loading and unloading the workpiece,
A center having a center part for centering the workpiece and a holding fitting part that can fit into the workpiece is attached to a slider that is driven by an actuator to reciprocate, and the slider further has a center that slides in the direction of loading and unloading the workpiece. A slide bar is provided that is always biased in the direction of carrying out the workpiece, and a positioning member is provided on the center side of the slide bar that engages with the workpiece to regulate its position. A workpiece loading/unloading device for a machine tool, characterized in that a stopper is provided that comes into contact with the slide bar during movement in a loading direction.