JPH0153130B2 - - Google Patents

Description

Detailed Description of the Invention The present invention has a long upper beam and a lower beam, one of which approaches and separates from the other, thereby forming an upper mold (punch) and a lower mold attached to each of the upper and lower beams. The present invention relates to a vertical type automatic exchange device for a press brake that presses and bends a plate material between a die and a press brake.

Generally speaking, with this type of press brake, the bending length, bending angle, bending shape, rising flange length, bending inner radius, material plate thickness, etc. of the folded product,
Depending on the conditions required for the product, such as elastic modulus and overbend amount, it may be necessary to replace one or both of the upper and lower molds. Replacement must be done easily, accurately, safely and quickly.

Conventionally, replacing the upper and lower dies was usually done manually by workers, but with improved machines, the upper dies are installed radially around a rotation axis installed horizontally at the bottom of the upper beam. Some models have a large number of upper molds suspended horizontally around the entire upper beam like bamboo blinds, and are replaced by circulating them, but none of them have a heavy weight. Since many large upper molds are held at high positions, the center of gravity of the machine becomes high, resulting in a large-scale structure. Regarding the lower mold, a method is adopted in which the lower mold, which has a plurality of grooves in the radial direction described above, is rotated or moved horizontally forward or backward on the lower table, and these can be replaced in two or three ways. Not too much.

The present invention overcomes these shortcomings by providing a simple device in the press brake body so that the upper and lower molds can be replaced separately, singly, at the same time, or in any combination without labor. This is how it was done.

One embodiment will be described in detail below with reference to the drawings.

What is generally indicated by 1 in FIG. 1 is a press brake, and 3 is a mold stocker.

The mold stocker 3 consists of a frame 5 welded together into a substantially cubic shape using channel material.

For the sake of explanation hereafter, the longitudinal direction of the upper and lower molds of the press brake is the X-axis direction (horizontal direction in Fig. 1),
Front and back direction of press brake (horizontal direction in Figure 2)
is called the Y-axis direction.

As seen in FIG. 2, on the opposing surface of the frame 5 in the X-axis direction, a square shaped pillar block 9 for supporting a thick drum rotating shaft 7 is fixed approximately in the center of the square. A lattice 11 is set up.

A large diameter drum 13 is rotatably installed on the drum rotation shaft 7 via a bearing 13 as one side of an upper mold storage device for storing upper molds, and a large diameter drum 13 is rotatably installed on the same shaft as one side of an upper mold storage device for storing upper molds. As an example of the lower die storage device, a small diameter drum 17 is fixed, and each drum is constructed by appropriately connecting opposing circular surfaces with pipes, long bolts, etc. In addition, both large and small diameter drums are provided with a cavity that is long in the X-axis direction near the outer periphery of the drum.
In the embodiment shown in Figures 1 and 2, it can be seen that there are 24 cavities 23 for storing the upper mold and 12 cavities 25 for storing the lower mold, but these numbers can be freely prepared. Of course. In addition, in this embodiment, the lower die storage cavity is set to be at the same level as the lower die mounting level of the machine, so that the upper die of the large diameter drum can be mounted on the lower die.
The lower mold is stored in the small diameter drum, but the entire mold stocker 3 is installed at a high position, the lower mold is stored in the large diameter drum, and the upper mold is stored in the small diameter drum, and molds are carried in and out at the bottom of the drum. It is clear that it can also be easily carried out at the location.

The end of the drum rotating shaft 7 opposite to the press brake protrudes from the frame 5, and a timing pulley 27 is fixed thereto with a key, and a timing belt 29 extends diagonally to the lower right in FIG. It is connected to a reduction gear 31 , and further connected to a servo motor 35 via a universal joint 33 . An encoder 37 is attached to one end of the reducer 31.

A clutch 39 is provided between the drum rotating shaft 7 and the large diameter drum 15, and it is possible to select whether the large and small diameter drums are to be rotated as one unit or when only the small diameter drum is to be rotated.

As mentioned above, since the large-diameter drum can rotate independently of the encoder 37, a shot pin receiver 41 is provided on the outside of its outer periphery, and a shot pin receiver 41 is provided on the outside of the outer circumference of the large-diameter drum, as shown in FIG. It is located slightly to the right of the top of the large diameter drum. 43 is shot pin, 45
47 is a universal joint, and 49 is a drive cylinder that moves the shot pin forward and backward.

The storage cavities of the large and small drums are each marked with a symbol, and the encoder 37 moves the storage cavity with a specific symbol to a specific position (in this example, the highest position of the large and small drums) for exchanging the upper and lower dies. To confirm this, the large-diameter drum is provided with as many docks 51 as there are upper mold storage cavities, and the frame body 5 is
A near-point switch 53 is provided at a corresponding position, and for the same purpose, a near-point switch 57 corresponding to a dog 55 is provided for a small diameter drum.

In addition, in order to newly extrude the upper mold and lower mold from the stored state, an extrusion cylinder 59 for the upper mold and a lower mold are used as a mold extrusion device that extrudes in the X-axis direction when the required upper mold and lower mold occupy the highest positions. Extrusion cylinder 6
1 are provided at the positions shown in FIG.
The piston rod of the cylinder 59 is located in the upper mold storage cavity 2.
3, the upper die is pushed through a hole provided in the large diameter drum 15.

Generally speaking, the press brake shown in 1 is of a type in which the upper beam approaches and separates from the immovable lower beam for bending, and as mentioned above, there is a lower mold storage cavity 25 and a lower mold mounting level. are provided at the same level, but the upper mold storage cavity 23
The height level is naturally higher than the lower die mounting level, but
A specific position within the movement range of the upper beam is determined from the design of the mold stocker 3, and can be generally designated and positioned by the upper mold position setting mechanism shown at 63.

As shown in FIGS. 4A and 4B, guide bars 65 and 65' are fixed horizontally in the Y-axis direction to both side plates of the press brake 1, and the upper die receiving device 67 is driven by being guided by these. The cylinder 69 allows the cylinder 69 to move forward from behind the press brake and take up a position slightly away from the upper mold only when replacing the upper mold. As shown in Figures 3 and 4, the upper mold receiving device is a long member with an approximately L-shaped cross section, and at both ends in the X-axis direction there are upper molds for moving the upper mold in the longitudinal direction. In order to constitute a moving device, sprockets 71 and 73 are provided which are rotatable around a vertical axis, and a chain 75 is wound around the sprockets 71 and 73. 77 is a reversible motor coaxial with the sprocket 73. A plurality of dogs 79, 8 are attached to the horizontally circulating chain 75.
1, etc. are provided, and as shown in FIG. 5, they directly contact the projection 83 of the upper mold and act to push the upper mold in the X-axis direction. Also, limit switches 85 and 87 are provided inside the annular shape of the chain at the positions shown in FIG. 4B to issue signals such as completion of movement of the upper die.

Since the lower beam of the lower mold is fixed, the lower mold receiver 89 is also fixed on the table of the press brake as shown in FIG. 3, and although it is not as complicated as the upper mold receiver, the sprockets 91, 93, The reversible motor 95, chain 97, etc. are provided as in the case of the upper mold receiver, and although not shown, dogs, limit switches, etc. are also arranged in the same manner as in the upper mold receiver.

Figure 6 shows that the L-shaped horizontal part of the upper die receiving device 67 is equipped with a large number of V-grooved rollers to reduce the frictional resistance of the movement of the upper die. , shows that the frictional resistance was also lowered by using a ball bushing with a built-in elastic body. Fig. 8 shows a receiving jig prepared in the upper die storage cavity. Even if the upper die has opposite bends, both bends can be corrected by shifting the position of the receiving roller shaft in the elongated hole. This shows that the upper mold can also be processed with one jig.

When exchanging the upper and lower molds using the apparatus configured as described above, the upper beam is stopped at a height determined by the level of the upper mold storage cavity 23 of the mold stocker 3, and the upper mold receiving device 67 is By operating the drive cylinder 69, it is advanced to just below the upper mold and stopped.

Next, by manually or applying fluid pressure from the front of the machine, loosen the clamps between the upper and lower molds and the upper and lower beams, and the upper mold will be lowered by its own weight to the upper mold receiving device 67 and received there, and the lower mold will is stationary on the lower beam.

Next, rotate the large and small diameter drum to place the empty cavity that houses the upper and lower molds that have been used until now in the uppermost position, drive the reversible motors 77 and 95, and move the chains 75 and 97. , push them into their respective storage cavities to finish storage.

Next, specify new numbers for the upper and lower molds, rotate the large and small diameter drums at the same time, first decide on the cavity of the desired number in the upper mold, then drive the shot pin 43, release the clutch 39, and remove only the small diameter drum 17. Rotate to position the desired numbered cavity of the lower mold at the top.

The upper and lower molds are pushed out of the cavity by the extrusion cylinders 59 and 61, and the reversible motors 77 and 9
5. The upper and lower molds are pulled out by the action of chains 75 and 97, and the center ring is performed with a dog. After the positioning is confirmed by the limit switch, the lower mold is fixed to the lower beam, and the upper mold is fixed to the upper beam. After inching and fixing, move the upper beam again to secure a gap between the lower end of the upper mold and the upper mold receiver 67. Then, actuate the drive cylinder 69 and move the upper mold receiver 67. 67 can be moved back to the rear of the machine where it will not interfere with plate processing, and the mold replacement is completed.

As can be understood from the above description of the embodiments, the gist of the present invention is as stated in the claims.As is clear from the description, the present invention provides An upper mold support device 67 that supports the upper mold when the upper mold is attached to and removed from the upper mold mounting part.
is provided so as to be movable in the front and rear directions toward and away from the upper mold mounting portion of the upper beam, and this upper mold device 67 is provided with an upper mold moving device for moving the upper mold in the longitudinal direction. It is being Further, a lower mold moving device for moving the lower mold on the lower mold mounting portion in the longitudinal direction is provided at a position close to the lower mold mounting portion of the lower beam in the press brake.

Therefore, according to the present invention, when automatically attaching and detaching the upper and lower molds to and from the press brake, the upper and lower molds are removed from the upper mold storage cavity and the lower mold storage cavity in the mold stocker. The mold can be moved easily and safely to the mold mounting part. Furthermore, by retracting the upper mold receiving device when it is not needed, it does not become an obstacle during the bending process.

It should be noted that the present invention is not limited to the above-described embodiments, but can be implemented in other embodiments by making appropriate design changes. For example, instead of large and small drums, endless chains or belts may be arranged in duplicate, and each belt may be provided with a mold storage cavity.

[Brief explanation of drawings]

FIG. 1 is a front view of a press brake equipped with the device of the invention. FIG. 2 is a side view of the same as above. FIG. 3 is a sectional view taken along the line AA in FIG. 1. Fourth
For convenience of comparison with FIG. 4B, FIG. 4A depicts the press brake portion in the front view of FIG. 1 again. FIG. 4B is a sectional view taken along the line BB in FIG. 1. FIG. 5, FIG. 6, FIG. 7, and FIG. 8 are explanatory diagrams of main parts. Explanation of the symbols representing the main parts of the diagram: 1...Press brake, 3...Mold stocker, 7...Drum rotating shaft, 15...Large diameter drum, 17...Small diameter drum, 39...Clutch, 43 ... shot pin, 65 ... guide bar, 67 ... upper die receiving device,
69... Drive cylinder, 89... Lower mold receiving device.

Claims (1)

[Claims] 1. The mold stocker 3 placed on the side of the press brake is equipped with an upper mold storage device having a plurality of cavities 23 for storing the upper molds and a lower mold storage device having a plurality of cavities 25 for storing the lower molds. , and both cavities 23,
This is an automatic mold changing device for a press brake, which is equipped with a mold extrusion device for pushing the upper and lower molds in the press brake toward the press brake. Upper mold support device 67 that supports the upper mold during attachment/detachment replacement
is provided so as to be freely movable in the front and rear directions toward and away from the upper mold mounting portion of the upper beam, and this upper mold receiving device 6
7, an upper mold moving device for moving the upper mold in the longitudinal direction is provided, and the lower mold on the lower mold mounting part is moved in the longitudinal direction to a position close to the lower mold mounting part of the lower beam in the press brake. An automatic mold changing device for a press brake, characterized in that it is provided with a lower mold moving device for the purpose of changing the mold.