JPH0260407B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention utilizes the reaction force of the upper die member in a bending die that bends a plate in the downward direction of a ram while leaving the ends of the plate free. This relates to a bending die that presses and bends a plate material with great force.

[Prior Art] As shown in Fig. 4, a conventional folding die is provided with a spring-type plate holder 2 on the front side of a movable upper die 1 attached to the lower end of a ram, and a semicircular plate inside the upper die. A rotary mold 4 having a V-shaped groove 3 is arranged in a flat part. Then, the ram is lowered to hold down the workpiece W with the presser action section 4a on the left side of the rotary die 3, the ram is further lowered to rotate the rotary die 4 to the right, and the bending action section 4b on the right side presses the workpiece W. Lower mold block 5
The edge bending is performed by bending the edge into the recess 6 of the edge.

[Problems to be Solved by the Invention] By the way, in the conventional bending die, the rotary die 4 attached to the upper die is rotated by a reaction force, and the workpiece W is rotated by the bending portion 4b at the tip of the rotary die 4. In order to rotate the rotary die 4, it is necessary to provide a certain distance of relief l between the bending portion 4b of the rotary die 4 and the corner 5a of the lower die block 5. .

Therefore, if the bending width of the workpiece is narrower than the clearance 1, even if the rotary die 4 is rotated, the bending portion 4b will not come into contact with the workpiece, so bending cannot be performed, and eventually There is a drawback that bending is limited to cases where the bending width is wider than the clearance l.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems of the conventional type, and includes an upper die assembly provided on the ram of a bending machine and a lower die assembly disposed on the upper surface of the bed. An angled work holder and an auxiliary mold are mounted on the front and rear surfaces of the upper mold assembly, facing each other and movable up and down, and a longitudinal work holder is mounted on the upper mold assembly at a position facing the lower mold. A recess with an arcuate cross section that opens downward in the direction is provided, and a roughly semicircular rotating mold is placed in the recess so that one edge is in contact with the upper surface of the workpiece holder and the other edge is in contact with the upper surface of the auxiliary mold. The upper mold assembly has an overhang protruding adjacent to the arc-shaped recess, and one side of the lower mold assembly is in contact with the overhang. A guide portion is provided to support the bending reaction force.

[Examples] Next, the present invention will be specifically described based on illustrated examples.

FIG. 1 is a sectional view of the folding mold of the present invention,
An upper die assembly 11 is attached to the lower end of the ram 10, and a lower die body 13 is provided on the bed 12.

An arc-shaped recess 14 is formed in the longitudinal direction along the bending line of the upper mold assembly 11, and a vertical guide portion 15a of a recess 15 formed in the lower mold body 13 adjacent to the recess 14 is formed. An overhanging portion 16 is formed to protrude so as to be in contact with it.

The arc-shaped recess 14 opens downward as shown in FIG. 1, and a rotating mold 18 having a substantially semicircular shape and a V-shaped groove 17 formed in the flat part is fitted into the recess 14. equipped. That is, as shown in FIG. 2, the guide plate 20 is attached to both end surfaces of the rotary die 18 using screws 19, and the arcuate hook 21 formed at the upper end of the guide plate 20 is attached to the outer periphery of the recess 14 of the upper die assembly 11. It is engaged with the formed arcuate groove 22 to support the rotary mold 18 so that it can rotate angularly.

Further, an angled work holder 23 and an auxiliary mold 24 are attached to the front and rear surfaces of the upper mold assembly so as to face each other.

The workpiece holder 23 has a stopper pin 26 inserted toward the upper mold assembly 11 through a long hole 25 formed in the web portion, and a rotary mold 18 disposed in a recess 14 on the upper surface of the workpiece holder 23a formed in the flange portion. It is attached so that the work holding action part 18a comes into contact with it.

On the other hand, the auxiliary mold 24 has a long hole 27 formed in the rear wall of the upper mold assembly 11, and the auxiliary mold 24
The stopper pin 28 is inserted toward the flange portion, and the bending portion 18b of the rotary die 18 is attached so as to abut on the upper surface of the bending portion 24a formed in the flange portion. Furthermore, the stopper pin 28 and the upper die assembly 1
A spring 30 is compressed between a pin 29 set up on the upper part of the auxiliary mold 24, and the auxiliary mold 24 is always given an upward tendency.

Next, the function of the above-mentioned bending die will be explained.

The workpiece W is placed on the lower die main body 13, and the protruding distance from the bending position is regulated by a back-side abutment piece (not shown), and then the ram 10 is lowered. As shown in FIG. 1, the upper mold assembly 11 and the workpiece holder 23 are attached to the lower end of the ram 10, so that the lower surface of the workpiece holder 23 first comes into contact with the workpiece W and holds the workpiece W down. When the ram 10 is subsequently lowered, the rotating piece 18 fitted into the recess 14 of the upper mold assembly 11 is moved as shown in FIG. Rotating clockwise, the bending part 24a of the auxiliary mold 24 slides downward against the spring 30 by the bending part 18b of the rotary mold 18 to press down the workpiece W and form it into the lower mold body 13. The edge of the workpiece W is bent within the recessed part 15. Also, the upper mold body 13
As shown in the figure, the corner 13a is made at an angle slightly more acute than 90 degrees in consideration of spring back, so it is not only possible to accurately bend the workpiece W at a right angle, but also prevent the upper mold assembly from occurring during bending. The overhanging part 16 protruding from the end of the solid body 11 contacts the vertical guide part 15a of the recess 15 formed in the lower mold body 13 to properly rotate and lower the rotary mold 18, thereby supporting the bending reaction force.

On the other hand, when the ram 10 is raised after the bending is completed, the auxiliary mold 24 is pulled upward by the spring 30, and the rotary mold 18 is returned to its normal state. The upper die assembly 11 with the attached upper die assembly 11 rises to the open height position.

[Effects of the Invention] As described above, the present invention includes a rotary mold installed in the upper mold assembly, an angled work holder at the front and rear ends, an auxiliary mold that can be raised and lowered, and a work holder acting portion of the rotary mold. Since the bending portion is attached so that the workpiece holder is in contact with the upper surface of the auxiliary profile, the workpiece can be edge bent even if the bending width of the workpiece is narrow.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of the folding mold of the present invention, Fig.
The figure is a sectional view of the rotary type part, FIG. 3 is a view showing a bent state, and FIG. 4 is a view showing a conventional type. 10... Ram, 11... Upper mold assembly, 12...
bed, 13...lower mold body, 13a...corner,
14... recess, 15... recess, 15a... vertical guide part, 16... overhanging part, 17... V-shaped groove, 1
8... Rotating type, 18a... Work holder, 18b...
... Bending action part, 19 ... Screw, 20 ... Guide plate, 21 ... Arc-shaped hook, 22 ... Arc-shaped groove, 23
... Work holding part, 23a... Work holding part, 24
...Auxiliary type, 24a...Bending part, 25, 27...
Long hole, 26, 28... stopper pin, 29... pin, 30... spring, W... work.

Claims (1)

[Claims] 1 Consists of an upper die assembly installed on the ram of the bending machine and a lower die assembly placed on the top surface of the bed, and an angle-shaped work holder and an auxiliary die are installed on the front and rear surfaces of the upper die assembly, respectively. They are mounted facing each other so that they can be raised and lowered, and a recess with an arcuate cross section that opens downward in the longitudinal direction is provided at the position where the upper mold assembly is in contact with the lower mold. It is rotatably fitted and supported so that one end edge contacts the upper surface of the workpiece holder and the other end contacts the upper surface of the auxiliary mold, and further, the upper mold assembly has a portion adjacent to the arcuate recess. 1. A folding die, characterized in that an overhang is provided in a protruding manner, and a guide portion is formed on one side of the lower die assembly to abut the overhang and support a bending reaction force.