JPH0219731B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a die changing carriage for a double-acting press.
Conventional configuration and its problems.

Conventionally, in a double-action press device in which a die (upper mold) and a lower punch are moved up and down in conjunction with each other,
The die is connected to the upper slide, and the punch is connected to the lower slide. In order to facilitate their replacement, the die and the lower mold are carried together onto the bed of the double-acting press machine by a mold exchange cart. The die was connected to the upper slide, and the punch was connected to the lower slide, but the process of connecting the punch and the lower slide had to be done within the body of the cart, so it was very time-consuming. .

By the way, in order to eliminate the above-mentioned drawbacks, as shown in FIG. In some cases, it has already been proposed that the punch 4 is pushed upward by the lower slide 5. However, according to this, the punch 4 is attached to the blank holder 6 of the lower die 3.
For example, each time the mold is replaced, the lower surface of the punch 4 and the upper surface of the lower slide 5 must be made parallel.For example, there are dozens of types of molds, and all molds must be replaced. At times, it is difficult to maintain the parallelism. Therefore, if the lower surface of the punch 4 and the upper surface of the lower slide 5 cannot be maintained parallel to each other, the punch 4 and the lower slide 5 will hit unevenly and the punch 4 will tilt, which will not only have a negative effect on the molded product but also cause the punch to 4 bites into the blank holder 6 and damages the lower mold 3.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a mold changing cart for a double-acting press that eliminates the above-mentioned conventional drawbacks.

Structure of the Invention In order to achieve the above-mentioned object, a mold changing cart for a double-acting press according to the present invention is a mold changing cart for a double-acting press machine having an upper slide for raising and lowering a die and a lower slide for raising and lowering a punch. An opening through which the lower slide can move in and out is formed in the main body of the truck, which is able to run freely on the bed of the double-acting press machine and supports the lower mold, and a liner provided on the peripheral wall of the opening is inserted into the opening. A box-frame-like elevating body that can be raised and lowered while being guided along the mold is disposed, and the elevating body is provided with a clamp device that can hold and release a punch inserted into the lower die.

Embodiment and Operation An embodiment of the present invention will be described below with reference to FIGS. 2 to 5.

11 is an upper slide 12 and a lower slide 13
and a die (upper die) 14 and a lower die 1.
The punch 17 of the lower die 15 is supported via an elevating body (described later) disposed within the die changing carriage 16. has been done.

That is, an opening 19 is formed in the center of the carriage body 18 of the mold exchange carriage 16, through which the lower slide 13 can freely move in and out. Inside the opening 19,
A box frame-shaped elevating body (hereinafter referred to as a pressure pad) 21 that is guided so as to be movable up and down along a liner 20 attached to the peripheral wall of the opening 19 is disposed, and is also provided at a plurality of suitable locations around the lower end of the truck body 18. It is supported by a supporting device 22 which is attached to the holder.

The support device 22 is attached to the lower end of the truck body 18.
It is composed of a support rod 23 that is provided so as to be able to move forward and backward toward the opening 19, and a cylinder device 24 that allows this support rod 23 to move forward and backward. Note that the pressure pad 21 is merely placed on the support rod 23. Further, at the center of both sides of the lower end of the pressure pad 21, there is provided a protrusion 21a which is inserted through a long hole 25 in the vertical direction formed in the side plate 18a of the bogie body 18 and the liner 20, and a protrusion 21a is provided on the side of the bogie body 18. Compression springs 26 are attached to corresponding positions to press the protrusions 21a downward. In addition, 27
is a guide rod of the compression spring 26, and the upper end thereof is connected to the upper plate 18 that projects outward from the side plate 18a of the truck body 18.
b, and the lower end is loosely inserted into a hole 28 formed in the protrusion 21a.

Furthermore, blank holders 29 for the lower die 15 are located at the left and right positions of the front and rear sides of the pressure pad 21.
A holding device 30 is provided which can hold and release the punch 17 disposed therein. 31 is the trolley body 18
A blank holder pressure adjustment device that supports the entire blank and adjusts the holding pressure of the blank.
For example, 2 positions within and on both sides of the lower slide 13.
It is composed of individually arranged cylinder devices 33 and a support body 34 interposed between the cylinder devices 33 and the mold exchange cart 16.

Hereinafter, the effects of the above configuration will be explained.

First, the die 14 is held on the blank holder 29 of the lower die 15 and the punch 17 of the lower die 15 is held on the pressure pad 21 in the carriage body 18, and then the mold exchange carriage 16 is moved onto the bed 32.

Next, the die 14 is attached to the upper slide 12, and the entire mold exchange carriage 16 is supported with a predetermined pressure by the blank holder pressure adjustment device 31. Then, when the prebent blank A is placed on the blank holder 29, the upper slide 12 begins to descend and presses and holds the blank A. At this time, the lower slide 13 moves up in conjunction with the upper slide 12, raises the punch 17 via the presser pad 21, and presses the blank A into a predetermined shape between it and the die 14. and,
The punch 17 and the die 14 are separated from the blank (press molded product) A in this order, but the punch 17 is returned to a predetermined position by the compression spring 26. Incidentally, minute stroke changes in the dwell area of the upper slide 12 are absorbed by the blank holder pressure regulating device 31, and furthermore, by changing the working fluid pressure of the cylinder device 33 of the blank holder pressure regulating device 31, arbitrary retention can be achieved. Pressure can be obtained and therefore a good drawing workpiece can be obtained.

Effects of the Invention According to the configuration of the present invention described above, the box-frame-shaped elevating body for holding the punch is disposed within the truck body, and the elevating body is guided by the liner provided on the peripheral wall of the opening of the truck body. , when replacing the mold, there is no need to replace the elevating body at the same time, and the elevating body is maintained in a good position relative to the bogie body via the liner, thus preventing contact between the elevating body and the lower slide. Once the surfaces are set parallel, no matter how many times the mold is replaced, the parallelism can always be maintained accurately and in good condition, eliminating the tilting of the punch that previously occurred, making it possible to obtain good molded products. At the same time, damage to the mold can be prevented.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional example, FIG. 2 is a sectional view of an embodiment of the present invention, FIG. 3 is a partially cutaway view of FIG. FIG. 5 is a sectional view of a main part and a plan view of the mold exchange cart of the same embodiment. 11...Double acting press device, 12...Upper slide, 13...Lower slide, 14...Dice, 1
5... Lower die, 16... Mold exchange trolley, 17... Punch, 18... Trolley body ヽ19... Opening, 21
... Lifting body (pressure pad), 22 ... Support device, 29 ... Blank holder, 30 ... Holding device.

Claims (1)

[Claims] 1. A die changing trolley for a double-acting press machine, which has an upper slide for raising and lowering a die and a lower slide for raising and lowering a punch, and is capable of moving freely on the bed of the double-action press machine and supports a lower die. An opening is formed in the main body through which the lower slide can freely move in and out, and a box-frame-shaped elevating body is disposed within the opening and is movable up and down while being guided along a liner provided on a peripheral wall of the opening, and the elevating body A double-acting press mold changing cart, characterized in that a clamping device is provided which can hold and release a punch inserted into the lower mold.