JPH0659562B2 - Rod loading method for double-end processing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a work loading method for a processing machine, and more particularly to a double-end processing machine in which one end of a rod is held by a spindle chuck and the other end is supported by a guide bush. The present invention relates to a bar material loading method.

[Problems to be solved by the invention]

In the double-end processing machine, a rod is inserted into the main shaft from the collet chuck side provided at one end of the main shaft, and its tip is projected from a guide bush provided opposite to the other end of the main shaft.
In the state where the rear end is projected from the main shaft collet chuck, the rod member is gripped by the main shaft collet chuck, and both ends of the protruding rod member are machined at the same time. In such a processing machine, when the rod material is supplied by the loader, the end portion must be stopped at an accurate position and grasped by the chuck. Therefore, it is conceivable to position the tip of the rod against the stopper, but in order to process the tip of the rod, the stopper must be positioned and retracted after being gripped by the chuck of the spindle. . Therefore, the stopper is provided so as to project to a predetermined position only when the bar is supplied, and to be retracted after the bar is gripped, and it is necessary to provide time for the stopper to move forward and backward each time the bar is supplied. However, this is a cause of prolonging the processing time.

In view of the above problems, an object of the present invention is to provide a loading method capable of supplying a bar material without using a stopper and shortening the processing time.

[Means for solving problems]

The method according to the present invention is a double-end processing machine having a headstock in the center and a loader on one side in the axial direction and an unloader on the other side. Push the bar into the unloader, stop the pusher at the specified position, fix the extruded bar into the unloader, and press the rear end face of the bar to the pusher side with a specified pressing force to create a new bar. The material is characterized in that it is positioned and gripped by a chuck provided on the main shaft.

〔Example〕

A description will be given below with reference to the drawings. In FIG. 1, reference numeral 1 is a headstock including a main spindle 2 and a collet chuck 3 mounted therein, and a chuck opening / closing mechanism such as a draw bar 4 for opening / closing the main spindle 2 is attached to the chuck. A steady rest bush 5 for supporting the rod is fixed to the end. The draw bar 4 is slid by a known chuck opening / closing mechanism to open / close the chuck.

A first turret 7 is provided on one side of the headstock 1, and a guide cylinder 25 of a loader 11 for supplying a bar material together with various cutting tools 47 is concentric with the main spindle 2 on the first turret 7. The second tool rest 9 is provided so as to be slidable in the axial direction, and the second tool rest 9 is provided on the other side. The second tool rest 9 is provided with a guide bush 13 together with each hidden cutting tool 45, and a guide cylinder of the unloader 19. A body 21 is supported concentrically with the main shaft 2 so as to be slidable in the axial direction.

The loader 11 includes a guide cylinder 25 slidably supported by the first turret 7 and a hydraulic cylinder 27 fixed to the turret 7.
And a piston rod 29 of the hydraulic cylinder 27 is connected to the guide cylinder 25 by a connecting member 31.
Is designed to move forward and backward. Furthermore, this cylinder 25
A rod pusher 33 having a center 33a at the tip is inserted and retracted by a driving means such as a chain mechanism (not shown), and the most advanced position at the time of insertion is the pusher 33 only when the rod is supplied. Is limited by a stopper 34 fixed at a predetermined position.

On the other hand, the guide cylinder 21 of the unloader 19 is the hydraulic cylinder 3
5 is configured to move in the axial direction by a piston rod 37, a hydraulic cylinder 39 is mounted on the cylinder body 21, and a holding member 4 fixed to the tip of the piston rod.
1 protrudes inward through an opening provided in the cylindrical body 21,
The bar can be pressed down.

Next, the method of the present invention will be described with reference to FIG.

First, by a known chute bars W ₁ is not shown during the first machining start is supported on the inlet portion of the guide cylinder 25 of the loader 11 (the same state as bar W ₂ in FIG. 2 h), the pusher 33 is advanced Then, the bar is inserted into the guide cylinder 25 (see FIG. 2i), and then the guide cylinder 25 and the pusher 33 advance together to move the guide cylinder 25 to the chuck 3 of the spindle 2.
When the pusher 33 further advances at a position close to, the rod is inserted into the main shaft 2 and the tip portion is inserted into the guide bush 13 to support the tip of the rod (Fig. 2a). Next, a backup positioning member (stopper) similar to the conventional technology that is biased in the guide bush direction by a spring.
43 is inserted at a position close to the tip of the bar (b), the bar is pushed until the stopper 34 of the pusher 33 comes into contact and stops at a predetermined position, and the tip is brought into contact with the positioning member 43 so that the bar is predetermined. Position (c). Next, the chuck 3 in the main shaft 2 grips the bar material, and the positioning member 43 retracts (d). Up to this point, the positioning member (stopper) 43 similar to that in the conventional technique was used to supply the first rod W _{1 at} the preparatory stage, but the positioning member 43 is not used in the following steps. Subsequently, the loader cylinder 25 and the pusher 33 are retracted (e), the center hole 49 is machined in the rear end surface of the bar material by a tool not shown, and the pusher 33 with the stopper 34 removed advances to the tip of the pusher. The center 33a provided is engaged with the center hole (f). That is, the pusher also serves as the center for turning. Here, in order to increase the support force of the pusher 33 as a center, a fitting support portion of the pusher 33 is provided at the tip end portion of the tubular body 25, and the tubular body 25 is also advanced so as to be supported near the center hole 49. Is desirable. Then, for example, a bite, 45, 4,
7 and the cylinder 25 and pusher 3 during processing.
3 is retracted (g), the next bar W ₂ is sent and held by the chute between the cylindrical body 25 and the pusher 33 (h),
It is inserted into the tubular body 25 by the pusher 33 (i), and the pusher is slightly retracted (j). When the processing is completed, the chuck 3 is opened (k), the guide cylinder 25 of the loader 11 and the guide cylinder 21 of the unloader 19 both advance toward the spindle 2 (l), and then the pusher 33 is stopped by the stopper 34. To move the rod W ₂ to the main shaft and the guide bush 13 until
Then, the rod W ₁ is inserted into the cylindrical body 21 of the unloader (m). Next, the piston rod of the hydraulic cylinder 39 of the unloader is projected, and the pressing member 41 at the tip of the piston rod is bar W.
₁ is pressed and fixed in the cylindrical body 21 (n). Subsequently, the piston rod 37 of the hydraulic cylinder 35 further projects to cause the cylindrical body 2
1 advances, and the bar W ₂ is pressed against the rear end face of the bar W ₁ (o). At this time, if the pressing force of the pusher 33 is made larger than the pressing force of the hydraulic cylinder 35, the bar W ₂ is regulated by the stop position of the pusher 33. Instead of the pressing force of the cylinder 35, the urging force of a spring provided between the guide cylinder 21 and the piston 37 of the hydraulic cylinder may be used. Thus, the rod W ₂ is brought to a predetermined position and fixed by the chuck 3 (p).

Next, the cylinders 21 and 25 and the pusher 33 retract,
The state (e) is entered, and the above operation is repeated.

Although the rod W ₁ remains in the cylindrical body 21, it is extruded by inserting the rod W ₂ in the next step and taken out as a product.

〔The invention's effect〕

As is clear from the above, according to the present invention, since the bar is positioned by using the pusher for supplying the bar and the bar previously processed, the conventional device is provided with a few devices. The bar can be supplied to a predetermined position by a simple device, and the positioning member 4 can be supplied each time the bar is supplied.
Since the step of inserting 3 into the position close to the tip of the bar and retracting after the chucking of the bar can be omitted, the processing time can be shortened accordingly.

[Brief description of drawings]

FIG. 1 is a side view showing an example of an apparatus embodying the present invention, and FIGS. 2 (a) to 2 (p) are views showing working steps. 2 ... Spindle, 3 ... Collet chuck, 11 ... Loader, 13 ... Guide bush, 19 ... Unloader, 2
1 ... guide cylinder, 25 ... guide cylinder, 27 ... hydraulic cylinder, 33 ... bar pusher, 35 ... hydraulic cylinder, 39 ... hydraulic cylinder, pressing member 41,

Claims (1)

[Claims] 1. In a double-end processing machine having a headstock in the center and a loader on one side in the axial direction and an unloader on the other side, a rod processed by a new rod material inserted into the spindle by a pusher of the loader. Push the material into the unloader, stop the pusher at a specified position, fix the extruded bar material in the unloader, and press the rear end surface of the bar material to the pusher side with a specified pressing force to create a new bar. A bar material loading method for a double-end processing machine, characterized in that a material is positioned and gripped by a chuck provided on a main shaft.