JPH0543964Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a forging machine that plastically works bolts, nuts, or other metal products by forging, and in particular, a material cutting knife in a former that can be replaced with one touch. Regarding the equipment to be installed.

[Prior Art] The material cutting knife provided in the former cuts the material sent to the tip of the quill into a predetermined size by moving across the tip, but the cutting action cannot be performed without interruption. Because of this, they wear out rapidly and therefore need to be replaced frequently.

As seen in Japanese Utility Model Publication No. 59-22904, conventional cutting knives are generally removably fitted into a mounting plate and fixed with screws.
The work of manipulating screws and opening/closing the presser metal fittings must be done manually, which requires time and effort to replace the cutting knife, and it is difficult to automatically replace the cutting knife using robots, making it difficult to maintain a consistent flow. This is hindering automation.

[Problem to be solved by the invention] The present invention has been made in view of the above-mentioned problems of the conventional technology, and its purpose is to easily and reliably replace the cutting knife with one touch. Moreover, the material cutting knife attachment device in the home machine can be performed quickly, fully automatically handles a series of operations from removal to attachment, and locking after attachment, and has a simple configuration and is cost-effective. This is what we are trying to provide.

[Means for Solving the Problems] In order to achieve the above object, Homa's cutting knife attachment device in the present invention feeds a material made of metal wire to the tip opening of the quill and moves it forward and backward across the tip opening. A device for cutting to a fixed size with a movable knife, the knife mounting plate being attached to a knife holder, having a mounting hole consisting of a circular through hole into which a knife member of a circular plate can be rotatably fitted; In addition to providing a cut portion that reaches the mounting hole from the outer end so that the hole diameter expands and contracts against elasticity,
The mounting hole is formed with a circumferential groove that engages with the engagement protrusion of the knife member on its inner surface, and a concave escape portion that serves as an entrance and exit for the engagement protrusion, and a cutout is formed in a part of the knife mounting plate. A locking mechanism for fastening is provided.

In the above device, it is preferable that the fastening lock mechanism comprises a lever and a hydraulic device for pushing the lever.

Further, the circular plate knife member may be provided with means for rotational operation and chucking.

[Operation] In Figs. 1 and 2, the material W is intermittently fed by a constant length by a feeding device (not shown), so the tip of the material passes through the quill 1 and protrudes from its tip opening 1a. Then, the stopper S caught it.

Then, the knife holder 3 moves from the left side to the right side with the knife mounting plate 4, so that the knife 2 crosses the tip opening 1a of the quill 1, so the material is a material cut to a certain size. W′ is obtained. The cut material W' is pushed to the right at the same time as it is cut, and stops at a position just in front of the pusher 13. And then Pushiya 1
3 protrudes forward, the material W' becomes the knife member 2a
It is pushed out from the hole 2b at the center of the hole 2b, and is held as it is by a chuck (not shown). In the next operation, the chucked material is carried to the front of the first die 15, where it is subjected to the forging action of the punch, and thereafter sent to the second and third die in sequence.

The knife member 2a is replaced as follows.

First, the lock mechanism 1 for fastening is activated by the hydraulic device 12.
Release the pressure to 0. Then, the lever 11 becomes free and the split ring portion 4a of the knife mounting plate 4 expands due to its elasticity. For this reason, the knife member 2a can freely rotate within the circumferential groove 8 of the mounting hole 5.
When the engagement protrusion 7 is aligned with the relief groove 9 by rotating the knife member 2a, the knife member 2a can be taken out from the attachment hole 5.

Next, when a new knife member is fitted into the mounting hole 5 by matching the engagement protrusion 7 and the escape groove 9 and rotated by a small angle using the turning tool 14, the engagement protrusion 7 engages with the circumferential groove 8. If the hydraulic device 12 is operated in this state, the lock mechanism 10 will become unremovable.
As a result, the split ring body portion 4a is tightened again and the diameter of the mounting hole 5 is reduced, so that the knife member is locked immovably.

If the rotation and removal of the knife member are performed by robot operation, it becomes possible to replace the knife member fully automatically.

[Example] The knife mounting plate 4 is fixed with a bolt 16 by attaching the base end 4b to the distal end mounting portion 3a of the knife holder 3.

The knife mounting hole 5 is formed as a circular through hole in the plate-shaped portion of the mounting plate 4, but a slit-shaped cut portion 6 is provided so as to reach the hole from the outer end, and the periphery of the mounting hole 5 is cut into a ring. Body part 4a. In this way, when the free end portion 4c of the split ring body portion 4a is pressed, the diameter of the attachment hole 5 is expanded or contracted via the cut portion 6.

At least one engagement protrusion 7 of the knife member 2a is provided so as to protrude from the outer periphery. When one or more are provided, they are formed at equal intervals around the circumference.

A recess 2c corresponding to the protrusion 14a of the turning tool 14 is provided on the front surface of the knife member 2a. The fitting of the recesses and recesses allows the knife member 2a to be rotated, mounted, and removed.

The relief portion 9 is formed at the front edge of the mounting hole 5 so as to correspond to the engagement protrusion 7 .

The hydraulic device 12 includes a hydraulic cylinder 12a and a piston or plunger 12b fitted into the hydraulic cylinder 12a so as to expand and contract.

Further, the lever 11 has an intermediate portion attached to a shaft 11a.
The rear end 11b is pivoted at the plunger 12b.
The hook portion 11c at the tip is brought into contact with the free end 4c of the split ring body portion 4a in a pressing manner.

The hydraulic cylinder 12a and the lever 11 are connected to the other end 4 corresponding to the free end 4c of the split ring body 4a.
Provided at d.

[Effects of the invention] Since the present invention is configured as described above, it produces the following effects.

After remotely operating the fastening lock mechanism to release the fastening, the knife member can be rotated through a predetermined angle and removed from the mounting hole of the mounting plate, making it possible to replace worn or damaged knives with new ones. tasks can be done easily and quickly.

Therefore, it is possible to automatically perform all operations from removing, mounting, fastening, and locking the movable knife using the robot device.

The configuration is simple and can be implemented at low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view of the Homa material cutting knife mounting device according to the invention, Fig. 2 is a plan view of the same, and Fig. 3 is a view of the knife mounting part. It is an enlarged sectional view. DESCRIPTION OF SYMBOLS 1... Quill, 2... Moving knife, 3... Knife holder, 4... Knife mounting plate, 5... Mounting hole, 6... Cut portion, 7... Engaging protrusion, 8... Circumferential groove, 9 ... Relief part, 10 ... Fastening lock mechanism,
11...Latching lever, 12...Hydraulic device, 1
3... Plunger, 14... Turning tool, 3a
...Mounting part, 4a...Split ring body part, W...Material.

Claims (1)

[Claims for Utility Model Registration] (1) A device that feeds a material W made of metal wire to the tip opening 1a of a quill 1 and cuts it into a fixed size with a movable knife 2 that moves forward and backward across the tip opening. The knife mounting plate 4 attached to the knife holder 3 has a mounting hole 5 consisting of a circular through hole into which the disc-shaped knife member 2a can be rotatably fitted, and a mounting hole 5 having a hole diameter which resists the retained elasticity. A cutout 6 that expands and contracts to reach the mounting hole from the outer end is provided, and the mounting hole has a circumferential groove 8 that engages with the engagement protrusion 7 of the knife member 2a on the inner surface, and an engagement protrusion 7 on the inner surface of the attachment hole. A material cutting knife mounting device for a home machine, characterized in that a recessed escape portion 9 is formed as an entrance/exit for the knife mounting plate, and a locking mechanism 10 for fastening to the cut portion is provided on a part of the knife mounting plate. (2) The material cutting knife mounting device for a home machine according to claim 1, wherein the fastening lock mechanism 10 is constituted by a lever 11 and a hydraulic device 12 for pushing the lever. (3) The material cutting knife mounting device for a home machine according to claim 1 or 2, wherein the disc-shaped knife member is provided with means for rotational operation and chucking.