JP2929322B2 - Die cushion pin replacement method and replacement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exchange method and an exchange apparatus for automatically exchanging a plurality of die cushion pins provided in a bolster of a press.

[0002]

2. Description of the Related Art A conventional press is provided with a die cushion, and a die set on a bolster is elastically supported by the die cushion through a plurality of die cushion pins. The above-mentioned die cushion pin is removably fitted into a pin hole formed in the bolster, and its arrangement is changed according to the mold every time the mold used changes. An operator manually performs the changing operation, or a die cushion pin is set in all the pin holes in advance, and only necessary pins are selectively used by an automatic pin selection device.

[0003] However, in a method in which a worker performs the work manually, a die cushion pin used in accordance with an increase in the size of the press is also large and heavy, so that the replacement work becomes difficult or the replacement work becomes difficult. When work efficiency is poor due to the need for time and labor, and when many kinds of small-quantity production are performed in recent years, replacement work must be performed frequently. This causes problems such as damage to the mold. In the case of selecting the pins to be used by the automatic pin selection device, a lock device that locks the pins is required for each pin, so that the interval between the pins cannot be reduced, and the operation of the lock device is small because the lock device is small. In addition to being unstable and lacking reliability, there are also problems such as high cost due to the complicated structure. The present invention has been made for the purpose of improving the above disadvantages,
An object of the present invention is to provide a method and an apparatus for replacing a die cushion pin which can automatically replace a die cushion pin.

[0004]

In order to achieve the above object, the present invention provides a bogie rail for transferring a bogie onto a moving bolster pulled out of a press body, and reciprocating from the bogie rail to a moving bolster. A trolley having a die cushion pin storage portion that is freely provided and stores the collected die cushion pins, and a die cushion pin mounted on the trolley and collected from the moving bolster is stored in the die cushion pin storage portion. The replacement robot takes out a die cushion pin to be used next from the die cushion pin housing portion and inserts the die cushion pin into the pin hole of the moving bolster in a previously input arrangement.

[0005]

[Operation] The bogie is reciprocated on the moving bolster pulled out from the press body. First, the exchange robot mounted on the bogie on the outgoing path of the bogie collects all the die cushion pins in the moving bolster, and returns to the above bogie. Then, the die cushion pin to be used next can be set in the pin hole of the moving bolster in the arrangement inputted in advance.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall plan view, in which 1 is a press body such as a transfer press, and 2 is a processing station provided on the upstream side of the press body 1, which is a moving station which can be moved in and out in the front-rear direction. A bolster 3 is provided. Moving bolsters 4 are also provided at the other processing stations of the press body 1, and the dies 5 are mounted on the moving bolsters 4 and before and after the processing station 2 where the drawing is performed. Automatic exchange devices 7 for exchanging the die cushion pins 6 housed in the respective pin holes 3a in the moving bolster 3 drawn out from the inside 1 are installed.

As shown in FIG. 2 and subsequent drawings, the automatic exchange device 7 has a guide rail 9 laid in a direction parallel to a traveling rail 8 used to pull out the moving bolster 3 from the press body 1. A carriage rail 10 is slidably supported on 9. The bogie rail 10 is movable toward the moving bolster 3 by a drive motor 11, and a bogie 12 is mounted on the bogie rail 10 so as to run freely. The trolley 12 has wheels 13 which roll on the trolley rail 10 at the lower part.
The trolley 12 is driven on the carriage rail 10, and a positioning block 16 provided on an end surface of the moving bolster 3 is provided at the front of the carriage 12.
, A notch 10a for positioning the carriage 12 with respect to the moving bolster 3 is formed.

A pin receiving portion 18 is provided on the carriage 12, and a plurality of pin holes 19 formed in the pin receiving portion 18 have die cushion pins (pressure pins).
20 are accommodated. These die cushion pins 20 are mounted on an exchange robot 21 mounted on the front of the carriage 12.
Is to be replaced. The exchange robot 21 includes a pair of columns 22 erected on both sides of a front portion of the carriage 12.
The base of the arm 23 is supported movably up and down. The arm 23 has a joint 24 at an intermediate portion, and is refracted by the joint 24. At the tip of the arm 23, a gripping device 25 for gripping the upper end of the die cushion pin 20 is exchangeable as an attachment. Mounted on In the figure, reference numeral 27 denotes Y with respect to the moving bolster 3 by sandwiching the moving bolster 3 from both sides.
Y-axis positioning mechanism for positioning the carriage 12 in the axial direction, 2
Reference numeral 8 denotes an X-axis positioning mechanism for detecting the absolute value of the carriage 12 by counting the number of T-grooves 3b formed on the moving bolster 3. May be provided and counted. Further, reference numeral 29 in the figure denotes a pin lifter which pushes up the die cushion pin 20 pulled out to the replacement position from below.

Next, a method of replacing the die cushion pin 20 and the operation of the above-configured replacement device will be described. When the moving bolster 3 pulled forward or backward from the inside of the transfer press 1 stops at the replacement position, the bogie rail 10 is moved toward the moving bolster 3 by the drive motor 11, and the leading end contacts the end face of the moving bolster 3. Stopped. In this state, the carriage 12 is moved toward the moving bolster 3 by the traveling motor 14 and is transferred onto the moving bolster 3 from the carriage rail 10. The carriage 12 transferred onto the moving bolster 3 is positioned in the Y-axis direction with respect to the moving bolster 3 by the Y-axis positioning mechanism 27 provided on the front side sandwiching both sides of the moving bolster 3. At the same time, when the carriage 12 moves on the moving bolster 3, the X-axis positioning mechanism 28
Detects the first T-groove 3b, and performs positioning in the X-axis direction by inserting the locate pin 28a into the T-groove 3b.

In this state, the exchange robot 21 collects the die cushion pins 20 projecting from the upper surface of the moving bolster 3 one by one by the pin lifter 29, and arranges them in the pin accommodating portion 18 on the carriage 12 to accommodate them. When all the die cushion pins 20 within the reach of the arm 22 of the exchange robot 21 are extracted, the locate pin 28a is extracted from the T groove 3b, and the carriage 12 moves forward, and when the next T groove 3b is detected, the locate pin 28a is again inserted into the T groove 3b. When all the die cushion pins 20 are accommodated in the die cushion pin accommodating portion 18, the operation of inserting the die cushion pins 20 is performed in the next return step. The work of inserting the die cushion pin 20 is as follows. When the bogie 12 retreats and the predetermined T groove 3b is detected by a command of a program input in advance, the X-axis positioning mechanism 28 inserts the locate pin 28a into the T groove 3b. .

In this state, according to the program, the exchange robot 21 extracts the die cushion pin 20 of the die cushion pin housing 18 and inserts it into a predetermined pin hole 3a of the moving bolster 3. When the insertion of the range where the arm 22 of the exchange robot 21 can reach is completed, the robot retreats again and repeats the above operation, and inserts all die cushion pins 20 programmed in advance. When the insertion of all the pre-programmed die cushion pins is completed, the carriage 12 moves to the fixed position of the carriage rail 10, and when the carriage 12 stops at the fixed position, the carriage rail 10 is retracted to the retreat position, and the replacement work is performed. finish. The above is the die cushion pin 2
Due to the automatic exchange method and the operation of the exchange device 0, the exchange device 7 is installed before and after the processing station 2 so that the die cushion pin 2 to be used next while the press body 1 is being operated.
Zero replacement work is possible. Also moving bolster 3
When the cart 12 reciprocates on the upper side, the die cushion pins 20 in the moving bolster 3 are collected on the outward path. If there is a collection leak, the carts 12 cannot proceed due to the remaining die cushion pins 20. In addition, the leakage of the die cushion pin 20 can be reliably prevented. This prevents problems such as damage to the mold 5 due to leakage of the die cushion pins 20 being collected.

[0012]

As described in detail above, the present invention, when reciprocating to a carriage on a moving bolster pulled out from a press, removes all die cushion pins in the moving bolster by an exchange robot mounted on the carriage on the outward path. Since the die cushion pin to be used next is collected and set on the outward route, the die cushion pin can be automatically replaced without requiring any manual operation. Thus, even if the die cushion pin is large and heavy, it can be exchanged efficiently in a short time, and the next necessary die cushion pin is securely set in the pin hole of the moving bolster based on the data input in advance. be able to. In addition, by installing an exchange device near the position where the moving bolster is pulled out, the die cushion pin can be automatically exchanged, so that it can be easily implemented on existing transfer presses, and moving like an automatic pin selection device It is not necessary to equip all the pin holes of the bolster with die cushion pins, so that the number of die cushion pins can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing a die cushion pin replacement device according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view of the automatic exchange device.

FIG. 3 is a side view of the same.

FIG. 4 is an arrow view from a direction A in FIG. 2;

[Explanation of symbols]

1. Press body, 3 moving bolster, 3a pin hole, 10 truck rails, 12 trucks, 18 die cushion pin storage, 20 die cushion pins, 21 exchange robot.

Claims (2)

(57) [Claims] 1. A truck 12 is reciprocated on a moving bolster 3 drawn out of a press body 1, and first a truck 1
In the outbound path 2, the exchange robot 21 mounted on the carriage 12 collects all the die cushion pins 20 in the moving bolster 3 and, on the return path of the carriage 12, the die cushion pins 20 to be used next are arranged in a previously input arrangement. A method of replacing a die cushion pin, wherein the method is set in a pin hole 3a of a moving bolster 3. 2. A bogie rail 10 for transferring a bogie 12 onto a moving bolster 3 pulled out from a press body 1.
A truck 12 provided with a die cushion pin housing 18 for reciprocatingly moving from the truck rail 10 to the moving bolster 3 and accommodating the collected die cushion pins 20, and mounted on the truck 12; The die cushion pin 20 collected from the moving bolster 3 is accommodated in the die cushion pin accommodation portion 18 and
Next, a die cushion pin 20 to be used is taken out from the die cushion pin housing portion 18 and an exchange robot 21 is provided which is inserted into the pin hole 3a of the moving bolster 3 in a previously input arrangement. Exchange equipment.