JPH021565B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a press die changing device. especially,
The present invention relates to a die changing device for a press machine having a fixed bolster.

[Description of prior art]

Many problems remain when replacing molds during setup changes or mold repairs for old large-scale press machines. Recently, press machines have been manufactured that are designed to allow for easy mold replacement, but because the machine has a long service life and the investment cost is very high, it is not easy to change the machine. The reality is that many old machines are still in use.

Among these, when changing molds for setup and repair of large press machines with fixed bolsters,
Either apply an external force to the press mold and make it slide on the bolster, or
Press molds are replaced by embedding bearings in the bolster or by setting and rolling lifter rollers with built-in bearings.

This method requires a large amount of force and easily damages the press die and bolster surface.
In addition, the accuracy of mold matching could not be maintained as required, making it impossible to separate the upper mold and lower mold and transport only the lower mold out of the machine.On the other hand, if bearings were used, the bearings were often damaged. Therefore, it has disadvantages such as not being suitable for heavy molds and being undesirable from an overall work safety standpoint.

The present inventors have focused on the fact that these problems can be solved by changing the structure of the moving part of the press mold, and have completed the present invention.

[Purpose of the invention]

The present invention facilitates the installation and removal of molds during set-up or repair of press molds used in large-scale press machines with fixed bolsters, improves mold matching accuracy, and enables molds to be carried out of the separator. The purpose of the present invention is to provide a press die changing device for

[Features of the invention]

The present invention is in line with the purpose of facilitating the exchange of press dies and improving the precision of attachment, removal, and alignment of the dies. A plurality of first T grooves provided at intervals, and these T grooves.
a plurality of lift bars that are vertically movably inserted into the grooves, have built-in hydraulic cylinders, and are raised and lowered by hydraulic pressure; and a plurality of second T grooves provided at predetermined intervals between the first T grooves on the upper surface of the bolster; a groove, a common plate mounted on the bolster, and a plurality of T-grooves formed at equal intervals along the center of the groove, matching the position of the first T-groove of the bolster on the lower surface of the common plate. A large number of bearings are embedded in the cylindrical hole so as to roll on the upper surface of the lift bar, and a second T of the bolster on the lower surface of the common plate.
A guide block is fixed to a plurality of grooves cut at a central position that matches the grooves, and slides in the second T groove to guide the forward and backward movement of the common plate, and a guide block on the lower surface of the guide block. The press includes a roller chain that is stretched in tension and receives the power of the back and forth movement of the common plate, a chain sprocket that meshes with the roller chain and moves the common plate back and forth, and a motor that powers the chain sprocket. a drive means provided outside the machine; a hydraulic means for raising and lowering the lift bar;
The present invention is characterized by comprising a control means for controlling the moving position of the common plate.

[Explanation based on examples]

Next, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a front view of the configuration of the device of this embodiment, FIG. 2 is a plan view of the configuration of the device of this embodiment, FIG. 3 is a sectional view taken along line AA shown in FIG. 2 of the device of this embodiment, and FIG. An enlarged sectional view of part B shown in Fig. 3, and Fig. 5 is an enlarged sectional view of part C shown in Fig. 3.
FIG.

In the apparatus of this embodiment, a common plate 3 is installed on a bolster 2 having a horizontal upper surface fixed to a press machine main body 1, and a press die 11 is mounted on the common plate 3.

A plurality of T grooves 2a are recessed in the upper surface of the bolster 2 in the direction of the arrow shown in FIG.
A lift bar 5 that moves up and down by hydraulic pressure is inserted in the. This lift bar 5 has a hydraulic cylinder 4
Built-in.

T-grooves 2b, which serve as guides for forward and backward movement of the common plate 3, are recessed at two positions near the center of the bolster 2 in parallel with the T-grooves 2a.

Further, the lower surface of the common plate 3 has a number of cylindrical holes 3a bored at regular intervals at positions opposite to the positions of the lift bars 5 inserted into the bolster 2.
A bearing 6 is embedded in the cylindrical hole 3a, and has a structure in which it rolls on the upper surface of the lift bar 5.

Furthermore, long grooves 3b are recessed in two central locations of the common plate 3 parallel to the direction in which the bearings 6 are buried, a guide block 8 is fixed to the long grooves 3b, and a roller chain 7 is stretched around the guide block 8. ing. This guide block 8 is
It is slidably fitted into a T-groove 2b recessed in the bolster 2, and functions as a guide when moving back and forth. The upper surface of the common plate 3 is provided with a plurality of T-grooves 3c for mold attachment.

A chain sprocket 9 rotated by the power of a motor 10 is fixed to the drawer side of the press mold 11 of the common plate 3, and the chain sprocket 9 is connected to the roller chain 7 stretched on the lower surface of the common plate 3. Common plate 3 engages with
The structure is such that the motor 10 moves forward and backward by forward and reverse rotation of the motor 10.

At the forward end of the common plate 3 of the press machine body 1, a forward stopper 12 including a limit switch for regulating the forward position when the common plate 3 is installed and stopping it at a fixed position is attached.

A mold pulling rail 14 is installed on the drawer side of the common plate 3 at the same height as the height when the lift bar is lifted, and the common plate 3 is installed at the end of the mold pulling rail 14. A retraction stopper 13 is attached to restrict the position when pulled out.

Next, the operation of the apparatus according to the embodiment of the present invention configured as described above will be explained.

To attach the press mold 11 to the press machine main body 1, the press mold 1 is placed on the common plate 3 pulled out on the mold pulling rail 14 by a crane.
1 and fix it with bolts and nuts using the T-slot 3c.

Next, when hydraulic pressure is applied to the hydraulic cylinder 4 by the hydraulic device 15, the lift bar 5 rises to a position slightly higher than the upper surface of the bolster 2. When the motor 10 is rotated in the normal rotation direction, the chain sprocket 9 rotates, force is transmitted through the meshing roller chain 7, and the common plate 3 is moved to the press mold 11.
The bearing 6 on the lower surface of the common plate 3 rolls on the upper surface of the lift bar 5 and moves forward, and the forward end of the common plate 3 reaches the forward stopper attached to the press machine body 1. 12, a limit switch is activated, the motor 10 stops rotating, and the press mold 11 mounted on the common plate 3 at a fixed position stops. When the hydraulic pressure is reduced at this position, lift bar 5
is lowered by the weight of the common plate 3 and press die 11, and the outer periphery of the bearing 6, which slightly protrudes from the lower surface of the common plate 3, enters the T-groove 2a of the bolster 2, and the upper surface of the bolster 2 and the lower surface of the common plate 3 are brought together. The press mold 11 is placed in a fixed position.

When carrying out the press die 11 from the press machine main body 1, the lift bar 5 is raised by the hydraulic device 15, contrary to the case of installation, and the motor 10 is rotated in the opposite direction.The bearing 6 rolls on the upper surface of the lift bar 5, and the die is removed. The common plate 3 on which the press die 11 is mounted on the retraction rail 14 moves.

When the forward end of the common plate 3 comes into contact with a backward stopper 13 attached to the end of the mold pulling rail, a limit switch is activated to stop the rotation of the motor 10 and the press mold 11 is pulled out to a fixed position.

〔Effect of the invention〕

As described above, according to the present invention, when changing a press die to a press machine body having a fixed bolster, an unnatural external force is not required, so the bolster and the press die surface are not damaged.
In addition, during press work, the structure does not apply any load to the bearings, eliminating damage to the bearings, and maintaining high mold matching accuracy, making it possible to install only the lower mold, making the work extremely safe. It has many excellent effects.

The invention also allows for the incorporation of a press die changing device that provides the above-mentioned effects into large press machines with fixed bolsters that are already installed.

[Brief explanation of drawings]

FIG. 1 is a front view of the configuration of an apparatus according to an embodiment of the present invention. Second
The figure is a structural plan view of an apparatus according to an embodiment of the present invention. FIG. 3 is a sectional view taken along the line AA shown in FIG. 2 of the apparatus according to the present invention. FIG. 4 is an enlarged view of part B shown in FIG. 3 of the apparatus of this embodiment.
FIG. 5 is an enlarged view of part C shown in FIG. 3 of the apparatus of this embodiment. 1... Press machine body, 2... Bolster, 3...
...Common plate, 4...Hydraulic cylinder, 5...
Lift bar, 6... bearing, 7... roller chain, 8... guide block, 9... chain sprocket, 10... motor, 11... press mold, 12... forward stopper, 13... backward stopper, 14 ...Rail for mold retraction, 15...Hydraulic system.

Claims (1)

[Scope of Claims] 1. A bolster having a horizontal upper surface fixed to a press machine, a plurality of first T-grooves recessed at intervals on the upper surface of the bolster, and a plurality of first T-grooves formed in these T-grooves a plurality of lift bars that are vertically movably inserted and have built-in hydraulic cylinders and are raised and lowered by hydraulic pressure; and a plurality of second T-grooves provided at predetermined intervals between the first T-grooves on the upper surface of the bolster; , a common plate mounted on the bolster, and a first portion of the bolster on the lower surface of the common plate.
A large number of bearings are embedded so as to roll on the upper surface of the lift bar in a large number of cylindrical holes drilled at equal intervals along the center of the groove, matching the positions of the T grooves, and the common plate. The number of the above bolsters on the bottom side
a guide block that is fixed to a plurality of grooves cut at a central position that matches the 2T groove and slides in the second T groove to guide the forward and backward movement of the common plate; and a lower surface of the guide block. a roller chain that is stretched across the common plate and receives the power of the back and forth movement of the common plate; a chain sprocket that meshes with the roller chain and moves the common plate back and forth; and a motor that powers the chain sprocket. A press type exchange device comprising: a drive means provided outside the press machine; a hydraulic means for raising and lowering the lift bar; and a control means for controlling the movement position of the common plate.