JP2008207231A - Tandem press and its working method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tandem press in which only the operation of absolute minimum presses is enough and with which a temporary placing table like a conventional press is not required entirely in the tandem press in which a plurality of presses are successively lined up on a line. <P>SOLUTION: This tandem pressing apparatus includes: a plurality of the presses (A, B, C, D) which are successively arranged from the front to the rear; conveying robots between the presses; and a conveyer 4 for carrying out worked goods after finishing pressing work in the rear of the last press, wherein the conveyer 4 is made extendable to the front exceeding at least the last press. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a press machine, and more particularly, to a plurality of tandem press machines having a carry-out device that can be extended and a processing method.

2. Description of the Related Art Conventionally, as a device for pressing a workpiece such as a steel plate (also referred to as “blank”) into a fixed shape, a pressing device in which a plurality of pressing machines are arranged on a line in a processing order is used.
Such a tandem press working apparatus has a plurality of press working machines each having a pair of upper and lower molds, the unloading device at the most upstream (most upstream side), and the most downstream (most downstream) A carry-in device for supplying a workpiece before processing to a press machine is arranged (see Patent Document 1).

The workpiece is sequentially formed from a flat plate that is a blank by a press machine, and finally processed by a final press machine to be finished in a designed shape.
In addition, the movement of the workpiece | work between press machines is normally performed by the robot for conveyance.
After the final processing is performed on the workpiece, the workpiece is taken out from the last press machine by the carry-out device, and placed on the transfer conveyor disposed behind (on the downstream side) the carry-out device.
The work placed on the conveyor is transferred to the next predetermined place.

However, depending on the type of workpiece, the complexity of the press working degree may be different.
In such a case, in the case of using the same tandem press processing apparatus, it is of course possible to use only a few upstream press machines among a large number of press machines in order to reduce the degree of processing. Arise.
In such a case, a temporary work table (so-called nest) is installed on the most downstream press machine that is not used.
The temporary table is usually installed at the position after removing the lower die of the press machine.

After the workpiece is processed by a plurality of upstream press machines, the workpiece is not processed by a plurality of downstream press machines, but is placed on a temporary table installed in the press machines.
Then, the workpiece placed on the last temporary placement table is picked up from the temporary placement table by a carry-out device arranged further downstream, and is moved out of the tandem press working device.

For example, in a tandem press machine equipped with four press machines, when only three upstream press machines are used, one downstream press machine (that is, the most downstream press machine) is not used. A temporary table is installed.
After the workpiece is machined by the three upstream press machines, it is not machined by the last press machine, but is placed on a temporary table installed in the press machine.
The workpiece placed on the temporary placement table is taken up by the carry-out device and moved out of the tandem press working device.

By the way, depending on the type of workpiece, there may be a case where only one of the many press machines is required, but in that case, all but the first press machine at the most upstream. The temporary rest is placed on each of the resting press machines and the workpiece is allowed to flow.
Needless to say, the transfer device (transfer robot) between the press machines must operate.

As described above, conventionally, a dummy temporary placement table for placement must be installed in a press machine that is not used.
Therefore, it takes time to change the setup.
In addition, depending on the type of work to be flowed, the dimensions and the like differ, and accordingly, a temporary storage table for different use must be prepared.
Since all the transfer robots with high power consumption arranged between the press machines must be operated, energy loss is large.
Even if it is not necessary to use all of the press machines, naturally, since it is once placed on the temporary table, the process time from loading into the tandem press working apparatus to unloading increases.

International Publication No. WO2004 / 96533

The present invention has been made against such a background.
That is, the present invention is a tandem press working machine in which a plurality of press working machines are sequentially arranged on a line, and it is only necessary to operate the press machine which is required at a minimum, and a tandem which does not require a temporary holding table as in the prior art. An object is to provide a press machine.
Furthermore, it aims at providing the press processing method by a tandem press processing machine.

  Thus, as a result of earnest research on the background of such problems, the present inventor can extend the transfer conveyor disposed behind the tandem press machine to the inside of the tandem press machine. Thus, it has been found that conventional problems can be solved, and the present invention has been completed based on this finding.

  That is, according to the present invention, (1) a plurality of press machines are sequentially arranged from the front to the rear, and a transfer robot is provided between the press machines, and the press process is finished behind the last press machine. A tandem press working apparatus including a conveyor for carrying out a subsequent workpiece, the conveyor being capable of extending forward beyond at least the last press working machine.

  Moreover, this invention exists in the tandem press processing apparatus of said (1) description with which the support means for supporting the extended conveyor is provided in the bolster which attached (2) and the metal mold | die.

  Moreover, this invention exists in the tandem press processing apparatus of the said (1) description provided with the support means for supporting the conveyor extended to the ground (3).

  The present invention also resides in (4) a tandem press working apparatus in which the carry-out conveyor has a sliding ladder structure.

  The present invention is also a press working method (5), in which a tandem press line device equipped with N press working machines sequentially performs processing by N processing steps. This is a press working method in which only the necessary steps are continuously performed from the NM uppermost streams obtained by subtracting several M, and then directly taken out of the tandem press line apparatus.

  As long as this invention meets this purpose, it is naturally possible to employ a configuration in which two or more selected from the above (1) to (5) are combined.

In the present invention, a plurality of press machines are sequentially arranged from the front to the rear, and a transport robot is provided between the press machines, and the workpiece after the press work is finished behind the last press machine. In a tandem press processing apparatus equipped with a conveyor for unloading, the conveyor can be extended to the front beyond at least the last press processing machine. No need for temporary stands that had to be done.
Since it is not necessary to operate all the transfer devices (transfer robots) arranged between the press machines, energy efficiency is good.
The time from being carried into the tandem press machine until being carried out is greatly reduced.

FIG. 1 is an explanatory view showing a press working method of the present invention.
In this press working method, the working is sequentially performed by N working steps by a tandem press working apparatus equipped with N press working machines [see FIG. 1 (A)].
At this time, only the necessary steps from the upstream side are performed, and then unnecessary steps on the downstream side are not performed.

That is, only the necessary steps are continuously performed from the NM uppermost streams after subtracting the steps that are not continuously used from the most downstream (that is, unnecessary).
Then, after passing through NM processing steps, it is directly taken out of the tandem press line apparatus [see FIG. 1 (B)].
By adopting such a method, the time required for all processing steps is greatly reduced.

Specifically, as will be described later, the time from being carried into the tandem press working apparatus until being carried out is shortened.
There is an advantage that, for example, there is no need for a temporary table that had to be provided in a press machine that has not been used in the past.
Next, a tandem press working apparatus embodying such a press working method will be described.

FIG. 2 is an overall plan view schematically showing the tandem press working apparatus of the present invention, and FIG. 3 is a side view of the tandem press working apparatus, showing a state where the conveyor is not extended.
These drawings are examples in the case where the tandem press working apparatus includes four press working machines.

As shown in the figure, the tandem press working apparatus has a large number of press working machines arranged on a line from upstream (ie, front) to downstream (ie, rear).
An upstream of the tandem press processing apparatus is a loading apparatus 1 for loading a workpiece before processing, a transport apparatus (for example, a transport robot) for moving the work between the press machines, and a tandem press processing apparatus. An unloading device 3 for unloading the final processed workpiece is disposed downstream.

  Specifically, in front of the most upstream press machine, a loading device 1 that loads a workpiece into the press machine, and then sequentially, a first press machine A, a second press machine B, and a third press machine. A machine C and a fourth press machine D are disposed, and a first transfer device 2A (for example, a first transfer robot) and a second press process are provided between the first press machine A and the second press machine B. A second transfer device 2B (for example, a second transfer robot) between the machine B and the third press machine C, and a third transfer device 2C between the third press machine C and the fourth press machine D. (For example, a third transfer robot) is installed.

A carry-out device 3 is installed behind the most downstream fourth press machine D.
Usually, the work W carried into the tandem press working apparatus by the carry-in apparatus 1 is sequentially subjected to the first process, the second process, the third process, and the fourth process by each press machine, and in the final process. The workpiece that has finished a certain fourth step is placed on the conveyor 4 by the carry-out device 3.

However, when there is a lot change of the workpiece W and a workpiece W of a rod having a different size and a low degree of processing is processed, the number of press working machines to be used may be small, for example, three.
In such a case, the die 7 of the fourth press machine D is removed as shown in the figure, and the press process in the fourth step is not executed.

Here, a workpiece such as a steel plate (also referred to as “blank”) is sequentially processed while moving between the press machines from left to right as shown in the figure.
The workpiece W is a thin steel plate, a thin aluminum plate, or the like. For example, a workpiece having a thickness of 0.5 to 4 mm and a size of about 2000 mm × 4000 mm is used.

In the tandem press working apparatus of the present invention, a carry-out conveyor provided behind the carry-out apparatus can be expanded and contracted and extended in the upstream direction.
That is, the conveyor 4 (extensible / contractable belt conveyor) can be extended forward beyond at least the last press machine.
The conveyor 4 moves so as to enter the tandem press machine and is extended to the forefront position of the third press machine C.
Conventionally, a temporary table was installed in the fourth press machine, but in the present invention, a temporary table is not required at all.

  FIG. 4 is an overall plan view schematically showing the tandem press working apparatus with the conveyor 4 extending downstream, and FIG. 5 is a side view of the tandem press working apparatus.

In the figure, a state is shown in which the top of the fourth press machine is entered to the position before the third press machine.
The conveyor 4 can extend in a cantilevered manner.
In this case, in order to secure the supporting force, support means 5 is provided to support the extended tip of the conveyor 4 (see FIG. 5).

The support means 5 is composed of a support bar 51 provided with an elevating means 52, and is usually arranged at a position where there is no hindrance to the processing of the workpiece W.
For example, a pit is formed on the ground (floor surface), the support means 5 is stored in the pit, the support bar 51 is raised to support the conveyor 4 when necessary, and when not necessary, the pit is lowered to stand by. It becomes a state.

The work W that has finished the final processing by the third press machine C is a transfer device 2C (third transfer robot) arranged between the third press machine C and the fourth press machine D. ) Is directly placed on the conveyor 4 and carried out of the tandem press processing apparatus.
In this case, the carry-out device 3 is in a standby state without being used, and the four-leg suction handling arm is removed.

  Here, as a means for expanding and contracting the conveyor 4, for example, a belt conveyor having a sliding ladder structure including a plurality of divided ladder segments such as a sliding ladder and extending and extending when necessary.

By the way, in the work W having a smaller degree of processing, there are cases where it is desired to use fewer press machines, for example, two.
In this case, the third press machine C and the most downstream press machine D are not used.
The conveyor 4 enters the tandem press machine and extends beyond the fourth press machine to a position before the third press machine.

For the work that has been finished with the second press machine, the second transfer device 2B (second delivery robot) arranged between the second press machine and the third press machine is used. In use, it is placed directly on the extended conveyor 4.
And it is carried out of a tandem press processing apparatus.
In this case, the third transfer device 2C and the carry-out device 3 are not used.

  Thus, in the present invention, the carry-out conveyor 4 can be extended to the front beyond the last press machine, so that it is bothered to install on a press machine that does not use a temporary table as in the prior art. There is no need to perform setup, and the setup change is extremely easy when processing lots having specifications with different processing degrees.

From the viewpoint of energy efficiency, it is only necessary to operate the necessary transfer device (transfer robot) arranged between each press machine, and it is not necessary to operate all the transfer devices as in the past. It is extremely advantageous to see.
Also, the operation of the carry-out device is unnecessary.
Naturally, the time from being carried into the tandem press working apparatus until being carried out is also shortened.

Although the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention.
For example, as the means for expanding and contracting the conveyor here, the example of the sliding ladder has been described in the embodiment, but any means that can be extended to an upstream press machine can be used.
Further, the support means 5 for securing the supporting force can be provided on the bolster 6 to which the mold 7 is attached, and can also be removable.

FIG. 1 is an explanatory view showing a press working method of the present invention. FIG. 2 is an overall plan view schematically showing the tandem press working apparatus of the present invention. FIG. 3 is a side view schematically showing the tandem press working apparatus of the present invention. FIG. 4 is an overall plan view schematically showing a tandem press working apparatus in a state where the conveyor of the present invention extends downstream. FIG. 5 is a side view schematically showing the tandem press working apparatus of the present invention.

Explanation of symbols

A ... 1st press machine B ... 2nd press machine C ... 3rd press machine D ... 4th press machine 2A ... 1st conveying apparatus 2B ... 2nd conveying apparatus 2C ... 3rd conveying apparatus 1 ... Carry-in apparatus 3 ... Unloading device 4 ... Conveyor 5 ... Support member 51 ... Support bar 52 ... Lifting means 6 ... Bolster 7 ... Mold

Claims (5)

A plurality of press machines are sequentially arranged from the front to the rear, a transport robot is provided between the press machines, and a conveyor for unloading the workpiece after the press process is provided behind the last press machine. Tandem press processing equipment,
A tandem press working apparatus characterized in that the conveyor can extend forward beyond at least the last press machine.   2. A tandem press working apparatus according to claim 1, wherein the bolster to which the mold is attached is provided with a supporting means for supporting the extended conveyor.   The tandem press working apparatus according to claim 1, further comprising support means for supporting the conveyor extended to the ground.   A tandem press working apparatus, wherein the carry-out conveyor has a sliding ladder structure.   This is a press working method in which processing is performed sequentially by N processing steps by a tandem press line apparatus equipped with N press processing machines, and NM pieces are obtained by subtracting the number M of unnecessary steps from all the steps. A press working method characterized in that only the necessary steps are continuously performed from the uppermost stream, and thereafter directly taken out of the tandem press line apparatus.

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