JPH0357364Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to an automatic loading device for thin workpieces in an NC lathe. It is related to the technology of receiving and sending to the work chuck.

(Prior Art) Conventionally, to carry in a workpiece to an NC lathe, the workpiece is loaded into a hopper from a chute device, stored in a predetermined position in the hopper, and then sent out to a workpiece chuck using a workpiece pushing device.

(Problem that the invention aims to solve) With this conventional work loading device, if the thickness of the work becomes much thinner than the radius, the work tends to fall over and becomes unstable, and when placed in the hopper, it falls or falls, ensuring that the work cannot be chucked. There was a problem that it could not be sent to

(Means for Solving the Problems) The present invention aims to solve the conventional problems and provide an automatic workpiece loading device for an NC lathe that can reliably feed a thin plate-like workpiece to a workpiece chuck. The gist is that a hopper that temporarily stores the workpiece supplied from the chute device and a workpiece pushing device that pushes the workpiece in the hopper into the workpiece chuck are fixed to the tool rest of an NC lathe, and the tool rest is moved under NC control. Process the workpiece
In an NC lathe, a resiliently supported workpiece stopper is placed opposite the workpiece delivery port of the hopper at the hopper position where it waits for the workpiece from the chute device, and the workpiece is sucked by negative pressure to the pressing plate of the workpiece pushing device. It is characterized by a vacuum suction mechanism that
This is in the automatic work loading device for NC lathes.

(Function) In this invention, a thin plate-shaped workpiece supplied from a chute device is thrown into a hopper waiting at the lower part through a receiving port, and is received by a workpiece receiver at the lower part of the hopper. In this state, the workpiece is held between the workpiece stopper and the pressing plate of the workpiece pushing device and does not fall. Thereafter, the tool rest or pressing plate is moved in the direction of the workpiece, and the workpiece is pressed against the workpiece stopper. Since the workpiece stopper is elastically supported, the impact of contact acts on the workpiece in a relaxed manner and does not damage the workpiece, and also allows for good adhesion with the pressing plate for quick suction. At the same time, the vacuum suction mechanism of the pressing plate also operates to vacuum-adsorb the workpiece onto the surface of the pressing plate. Next, the turret or pressing plate was moved backward, the workpiece was pulled away from the workpiece stopper, and in this state, the workpiece was moved together with the turret to bring it to the front of the workpiece chuck, and the pressing plate was moved forward to attract it to the pressing plate. The workpiece is sent out from the workpiece outlet of the hopper and transferred to the workpiece chuck.

(Example) Examples will be described below based on the drawings.

This embodiment is an example realized as an automatic work loading device for a comb-type NC lathe.

As shown in FIG. 1, the workpiece loading device consists of a chute device 1 and a workpiece pushing device 2. The chute device 1 includes a narrow groove-shaped chute 3 for storing workpieces and a mechanism for feeding the workpieces one by one. In this feeding mechanism, when the cylinder 4 comes out, the stopper pin 8 comes down and stops the workpiece 6 from advancing. Also, since the stopper pin 7 is raised, the workpiece 5 moves forward and falls down. The workpiece pushing device 2 attached to the side of the tool rest includes a hopper 9 consisting of a workpiece receiving opening and a vertical chute, a V bevel guide 10 that guides when pushing the workpiece, and a pressing plate 1 that hits the workpiece.
1. Bearing 12 that rotates the pressing plate, Cylinder 13 that moves the pressing plate, Stroke shaft 1
4. Stroke bearing 15 and switch 1
6, 17 is more familiar. Further, the vacuum suction mechanism includes a suction groove 40 provided on the surface of the pressing plate 11, an air passage 41 bored in the center of the stroke shaft 14,
A communication path 42 that communicates these two, and a hose 43 that connects the air path 41 and a suction pump (not shown).
It is made up of. Further, the work stopper 26 is inserted into the stopper case 31 so as to be able to move forward and backward, and the work stopper 26 is inserted into the stopper case 31 so as to be able to move forward and backward.
2 toward the workpiece delivery port 30 of the hopper 9.

Further, the stopper case 31 is fixed to the chute device 1 by a mounting plate 33 and is fixed at a fixed position. The disc-shaped workpiece 5 is the chute device 1
It is dropped into the socket of the hopper 9 and placed in the guide 10 of the V bevel.

At this time, the workpiece on the guide 10 of the V bevel is held between the workpiece stopper 26 and the pressing plate 11 and will not fall over (see FIG. 3). After that, advance the tool rest, that is, the pressing plate 11 in the direction of the workpiece, press the workpiece against the workpiece stopper 26, and push the workpiece onto the pressing plate 1.
By suctioning the air in the air passage 41 while closely contacting the workpiece 1, the suction groove 40 on the surface of the pressing plate 11 is made to have a negative pressure, and the workpiece is attracted to the pressing plate 11. With the workpiece adsorbed, move the tool rest or pressing plate 1 backward, remove the guide 10 from the workpiece stopper 26, then slide the tool rest 24, move the workpiece pushing device 2 along the X axis, and hold it in front of the chuck. It's coming.

Since the chuck 18 is rotating slowly, leave a gap of about 0.2 mm so that the tip of the guide 10 does not touch the chuck 18, and align the left and right centers and position it front and back. When the pressing plate 11 is moved forward, the workpiece is centered by the guide and the gap between it and the chuck 18 is small, so the workpiece is pushed into the chuck 18 without losing its posture. Further, the chuck 18, the workpiece, and the pressing plate rotate together.
When the workpiece is pressed against the stopper 19 in the chuck,
Seating is confirmed by a combination of ON and OFF switches 16 and 17.

Switch 16 Switch 17 Judgment OFF OFF NG ON OFF OK ON ON NG If switches 16 and 17 are commercially available high-precision switches, dimensions of 0.02 mm or less can be controlled. For pushing the workpiece, the speed of the cylinder 13 is independently adjusted, and the workpiece can be pushed smoothly into the chuck 18, thereby reducing bruises and scratches. The left and right centering and front and back positioning of the workpiece pushing device 2 can be done arbitrarily and easily due to numerical control.

As shown in FIG. 4, the tool rest 24 has an unloader 2
5 unloader pins 20, a cutting tool group 21, and a workpiece pushing device 2 are provided. After machining, the unloader pin 20 is put into the workpiece, and at the same time as the chuck 18 is loosened, the workpiece is ejected onto the unloader pin 20 by the workpiece ejection built in the chuck.
The tip of the unloader pin 20, the tip of the cutting tool group 21, and the tip of the guide 10 of the workpiece pushing device 2 are lowered to the point where they do not interfere with the tip of the chuck 18.
In order to newly load the work into the chuck 18, the slide of the tool rest 24 moves to the left, and the work pushing device 2 comes to the front of the chuck 18.

Move the workpiece pushing device 2 forward and position it. After pushing the workpiece and tightening the chuck, lower the workpiece pushing device 2 to the rear, move it further to the right, and lower the tool 2.
2 into a cutting tool 23. Then, bring the unloader pin 20 to the front of the chuck. In other words,
The front and rear strokes do not interfere with the chuck,
On the left and right, one cycle of workpiece unloading, workpiece loading, and processing is completed by one reciprocation of the distance between the unloader pin 20 and the workpiece pushing device 2. Since the unloader pin 20 and the workpiece pushing device 2 can operate simultaneously without running back and forth more than necessary, there is no time lag and the time taken to carry in and take out the workpiece can be shortened.

(Effects of the Invention) As described above, the present invention has the advantage that the thin plate-shaped workpiece supplied from the chute device can be reliably held without falling and sent to the workpiece chuck.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the workpiece automatic loading device in the NC lathe of the present invention, Fig. 2 is a perspective view showing the hopper and workpiece pushing device, Fig. 3 is a sectional view of the workpiece stopper and the workpiece pushing device, FIG. 4 is an explanatory diagram showing the usage state of the same embodiment, and FIG. 5 is an explanatory diagram showing the state in which the pressing plate is pressed against the workpiece. 1...Chute device, 2...Work pushing device,
3...Chute, 5, 6...Work, 9...Hopper, 11...Press plate, 12...Bearing, 1
3...Cylinder, 14...Stroke shaft,
18...chuck, 21...cutter group, 24...turret, 26...work stopper, 30 workpiece delivery port, 31...stopper case, 32...spring, 40...suction groove, 41... air passage, 42
...Communication path, 43...Hose.

Claims (1)

[Scope of utility model registration request] A hopper that temporarily stores the workpiece supplied from the chute device and a workpiece pushing device that pushes the workpiece in the hopper into the workpiece chuck are fixed to the tool rest of the NC lathe, and the tool rest is moved under NC control to move the workpiece. In the NC lathe to be processed, a resiliently supported workpiece stopper is placed opposite the workpiece delivery port of the hopper at the hopper position that waits for the workpiece from the chute device, and the workpiece is placed under negative pressure on the pressing plate of the workpiece pushing device. An automatic workpiece loading device for NC lathes that is equipped with a vacuum suction mechanism.