JPH0248088Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a die changing device for a steel sheet bending machine.

BACKGROUND TECHNOLOGY In a device for bending a plate such as a steel plate, when changing the R dimension of the bending part, it is necessary to shape the tip R of the plate holding die to a dimension corresponding to the product. For this reason, the plate holding die had to be replaced every time the R dimension of the product changed.

Problems that the invention aims to solve: Since production cannot be performed while the plate-holding die is being replaced, productivity is significantly lower in high-mix, low-volume production.

The present invention has been developed in view of the above-mentioned circumstances, and its purpose is to improve productivity by automating the exchange of plate holding dies having different R dimensions of the bending portions.

Means and Effects for Solving Problems The present invention provides a mold clamping mechanism A for gripping and releasing the plate holding mold at the lower end of the ram 18 provided on the movable rod 17 of the lifting device 16. A mold holding plate 3 is provided with a pair of mold holding grooves and a clamper symmetrically with respect to the rotation center on the sides thereof for gripping and releasing a holding arm 39 provided on the plate holding mold.
The ram 18 is raised to hold the plate holding mold held by the mold clamp mechanism A on the mold holding plate 32, and the ram 18 is further raised. The plate holding mold held by the mold holding plate 32 is placed in a position opposite to the mold clamping mechanism A, and the ram 18 is lowered so that the plate holding mold can be held by the mold clamping mechanism A.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a machine body, and the center of the machine body 1 is a space 2. A magnetic conveyor 3 is disposed in this space 2, and the magnetic conveyor 3 is raised and lowered by a lift cylinder 4. It is something that Machine 1 has magnetic conveyor 3
Lower molds 5 are provided on the left and right sides of the mold. Further, bearing members 6 are fixedly installed in the machine body 1 at the front and rear sides of the lower die 5 as shown in FIG.
A support shaft 8 fixed to the front and rear of the holder 7 is supported. A lower mold 9 for bending is attached to the holder 7.

The rotation center P of the lower mold 9 for bending is the center of the support shaft 8, as shown in FIG. 1, and this rotation center P coincides with the outer upper edge of the lower mold 5.

As shown in FIG. 1, a rotating cylinder 10 is attached to the fuselage 1 so as to be swingable by a support shaft 11.
The piston rod 12 of the rotating cylinder 10 is attached to the holder 7
It is connected to a lower bracket 13 by a pin 14. Further, a work receiving member 15 is attached to the holder 7.

The fuselage 1 is provided with a pair of elevating devices 16 such as cylinders, and a ram 18 is attached to a movable rod 17 such as a piston rod of the elevating device 16. It is something that goes up and down.

The upper ends of links 20 and 21 are attached to the lower end of the ram 18 with pins 22 and 23, as shown in FIG. , 26. A clamp cylinder 27 is provided on the clamp body 24, and a clamper 29 is attached to a piston rod 28 of the clamp cylinder 27.

As shown in Fig. 2, the fuselage 1 has a mold holding mechanism B.
are provided on both sides of the ram 18. As shown in FIGS. 3 and 4, the mold holding mechanism B includes a pair of front and rear support shafts 30 supported on the machine body 1, and a swing gear 31 and a mold holding plate 32 are attached to the support shafts 30. There is. Two mold holding grooves 33 are formed in the mold holding plate 32 so as to be oriented upwardly and downwardly with a phase shift of 180 degrees. A clamp arm 34 is attached to the support shaft 30.
is rotatably provided by an appropriate means, and a pair of clampers 35 is swingably attached to the mold holding plate 32 close to the mold holding groove 33 by a pin 36, and the tip of the clamp arm 34 and the clamper 3
5 are connected by a link 37.

Reference numerals 38 and 38' denote first and second plate holding dies, and holding arms 39 are provided at both ends of the first and second plate holding dies 38 and 38'.
A clamp portion 40 is formed on the upper portion of each portion 8, 38'.

As shown in FIG. 3, the mold clamping mechanism A includes a first plate holding mold 3 whose bent portion 41 has an R dimension of A, for example.
8 is attached with its clamp portion 40 held by the clamper 29, and is attached to the mold holding plate 32 of the mold holding mechanism B.
On one mold holding mechanism 33 facing upward, a second plate holding mold 3 whose bent portion 41 has an R dimension of, for example,
8' is installed. That is, the second plate holding die 3
A holding arm 39 of 8' is inserted into the mold holding groove 33.

Next, the operation will be explained.

A workpiece 42 such as a steel plate is sent in the direction indicated by the arrow and placed on the lower mold 5. At this time, the workpiece receiving member 15 receives the workpiece 42.

The ram 18 descends and the first plate holding die 38 presses the workpiece 42. Next, the rotation cylinder 10 is extended and the lower bending die 9 is moved through the holder 7 to the rotation center P.
The workpiece 42 is bent by rotating around the center. Ram 1
8 rises and the plate holding die 38 separates from the workpiece 42,
The workpiece 42 is carried out by the magnetic conveyor 3.

Type exchange is done as follows.

The ram 18 is raised (stroked) more than during the above-mentioned bending process, and the first plate holding die 38 is stopped at the die changing position a shown by the imaginary line in FIG. 3, and the first plate holding die 38 is held. Place the arm 39 on the mold holding plate 3
2 into the other mold holding groove 33 facing downward, and by rotating the clamp arm 34, the link 37
Hang the clamper 35 on the holding arm 39 via the
The first plate holding die 38 is held by the die holding mechanism B. At this time, the holding arm 39 of the second plate holding die 38' is also held by the clamper 35.

Next, the clamp cylinder 27 of the mold clamp mechanism A
is actuated to release the grip of the clamp part 40 by the clamper 29, and the ram 18 is further raised to move the mold clamp mechanism A to the position shown by the imaginary line in FIG.

Next, rotational force is applied to the turning gear 31 to turn the mold holding mechanism B by 180 degrees, thereby bringing the second plate holding mold 38' to the mold exchange position a.

The ram 18 descends, and the clamp portion 40 of the second plate holding mold 38' is placed in the clamper 29 of the mold clamping mechanism A.
is inserted, and the clamp portion 40 is gripped by the clamper 29 by the operation of the clamp cylinder 27.

Next, the clamp arm 34 of the mold holding mechanism B is rotated to rotate the clamper 29 to the release side, releasing the grip on the second mold holding mold 38' and completing the mold exchange.

Effect of the invention By raising the ram 18 and moving the first plate holding mold 38 held by the mold clamping mechanism A to the mold holding mechanism B, one mold holding groove 33 of the mold holding plate 32 and the clamper At 35, the holding arm 29 of the first plate holding die 28 can be held, and in this state, the holding of the first plate holding die 28 by the mold clamping mechanism A is released to further raise the ram 18, and after this, the holding arm 29 of the first plate holding die 28 can be held. 32 and the other mold holding groove 33 and the clamper 3.
The second plate-holding mold 38' held by the mold 5 is placed in a position facing the mold clamping mechanism A, and the ram 18 is lowered again so that the second plate-holding mold 38' can be held by the mold clamping mechanism A.

Therefore, the ram 18 rises, the mold holding mechanism B holds the first plate presser mold, the mold clamp mechanism A holds and releases the first plate presser mold, the ram 18 rises, and the mold holding mechanism B holds the mold. By rotating the plate 32, lowering the ram 18, and holding the second plate holding die by the die clamping mechanism A, not only can the plate holding die be replaced automatically, but the replacement time can be shortened with fewer operations. .

In addition, since the mold clamping mechanism A can be raised and lowered together with the ram 18 using a lifting device that raises and lowers the plate holding mold during normal bending operations, the number of parts is reduced and the structure is simplified.

[Brief explanation of the drawing]

Figure 1 is a front view of the steel sheet bending machine, and Figure 2 is the front view of the steel plate bending machine.
3 is an explanatory diagram of the configuration of an embodiment of the present invention, and FIG. 4 is a left side view of FIG. 3. 1 is the fuselage, 18 is the ram, and 38 and 38' are the plate holding types.

Claims (1)

[Claims for Utility Model Registration] The machine body 1 is provided with a lower die 5 and a lower folding die 9 that rotates in the vertical direction, and a ram 18 is provided on a movable rod 17 of a lifting device 16 provided on the machine body 1. A steel sheet bending machine equipped with a mold clamping mechanism A for gripping and releasing a plate holding mold at 18, a mold holding groove is provided on the side of the ram 18 in the machine body 1 and faces upward symmetrically with respect to the center of rotation. 3
3 and a mold holding plate 32 having a downward mold holding groove 33
and a mold holding mechanism B comprising a clamper 35 for holding and releasing a holding arm 39 of a plate holding mold in each mold holding groove 33, and a mechanism for rotating a mold holding plate 32. Machine mold changing device.