JPH0150491B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a press device, and in particular, a plurality of press machines are arranged in parallel at regular intervals, and a workpiece conveyance device is provided between the presses, and the workpiece conveyance device allows the workpieces to be separated from the press machine in the previous process. Move the workpiece to the next press machine,
The present invention relates to a method of controlling a press device that sequentially performs press operations.

The applicant has devised the above-mentioned press device and has already filed an application. The press device uses a workpiece conveying device having a gripping means for gripping the workpiece.
It is designed to move the workpiece. The gripping means of this workpiece conveying device has a feed bar having a length approximately half the distance between the center positions of the press molds, and is equipped with gripping tools at both ends of the feed bar. This gripping means is stopped at a fixed position between the press machines, and after the press operation, it moves horizontally and descends, holding the workpiece in the lower die of the press machine and the workpiece in the intermediate stage at both ends. After gripping it with the gripper, it goes up, moves in the return direction, descends and places the workpiece that was on the intermediate stage on the next press machine, and the workpiece that was on the lower mold of the previous press machine on the intermediate stage. It will rise again and return to its normal position. The press machine operates after confirming that the gripping means has come to a fixed position, and the gripping means starts moving after confirming that the upper die has risen to the top dead center.

An object of the present invention is to provide a control method that further improves the above-mentioned conveying means and can further improve work efficiency.

The illustrated embodiment will be described below. FIG. 1 is a diagram showing the positional relationship between the presses 1 and 2 and the gripping means 3, and in FIG. This gripping means 3 moves toward the press machine 1 on the left side, descends to grip the workpiece, then moves to the right side and transfers the workpiece gripped by an intermediate stage (not shown) to the right gripping tool 3a on the right side. The state in which it is placed on the lower mold 2b of the press machine 2 and returned to the normal position is shown in FIG. At this time, if the gripping tool 3a returns from the home position to 1, a gap will be created between it and the end of the upper mold 2a, and even if the press is operated and the upper mold 2a is lowered at that point, there is no risk of contact. do not have. Therefore, the press machine can be operated when the gripping means 3 does not return to its home position and reaches this non-interference position l. On the other hand, as shown in FIG. Even if you move it at some point, it won't come into contact with you. It goes without saying that the non-interference position l of the gripping means and the non-interference position h of the mold differ depending on the size of the mold. As shown in the table of FIG. 2, these positions l and h are set in advance according to the type of mold and stored in the storage means 4.

On the other hand, a gripping means position detector 5 for detecting the horizontal position of the gripping means 3 and an upper mold position detector 6 for detecting the position of the upper mold are provided. In this embodiment, the gripping means position detector 5 uses a pulse encoder (not shown) because the gripping means 3 is moved by rotation of a motor. Rotary cam switch without using pulse encoder,
A limit switch, a proximity switch, etc. may be used and the signal may be used directly. Also, the upper die position detector 6
A rotary cam switch is used. Of course, it is possible to use a pulse encoder or the like as described above.

Furthermore, a mold selection switch 7 for selecting a mold is provided, and the outputs of the gripping means position detector 5, upper mold position detector 6, and mold selection switch 7 are sent to the CPU 9 via an input interface 8. , after the calculation, the press machines 1 and 2 are output via the output circuit 10.
and actuates the gripping means 3 (FIG. 3).

The control by the above circuit will be explained in further detail.
First, before use, when a mold is selected by the mold selection switch 7 according to the type of mold, for example, when the mold shown in the second diagram is selected, the memory means 4 is
l3 and h3 are called. In this state, when the apparatus of this embodiment is operated as described above, the gripping means 3 first moves toward the press machine 1 on the left side, and then moves to the right, and the workpiece gripped by the gripping tool 3a is transferred to the right side. Place it on the lower die 2b of the press, rise once,
Return to localization value. At this time, when it is confirmed by the gripping means position detector 5 that the position of the gripping tool 3a has reached the non-interference position l3, a command is issued from the CPU 9 to start the press machine. This non-interference position l3 is a position where the gripping means 3 does not interfere with the mold, so even if the press machine is operated before the gripping means 3 returns to its normal position, the mold and the gripping means 3 will not come into contact with each other. There's nothing to do.

During operation of the press, the gripping means 3 returns to its normal position and is on standby. After the press machine presses, the upper molds 1a and 2a rise. This ascending distance is measured by the upper mold position detector 6, and when the non-interference position h3 is reached, a command is issued from the CPU 9 and the output circuit 1
0 to operate the gripping means 3. This non-interference position h3 is pre-selected to a value that prevents the gripping means 3 and the upper mold 1a from coming into contact with the mold, so that the gripping means 3 can be removed before the upper mold 1a reaches the top dead center. Even when the movement is started, the upper die 1a and the gripping means 3 do not come into contact with each other.

As described above, according to the control method of the present invention, the movement of the gripping means can be started before the upper die reaches the top dead center, and the press machine can be operated at a time when the gripping means returns to its normal position. This can improve work efficiency.

Furthermore, if the selection switch is operated when the mold is changed, the non-interference position h of the mold and the non-interference position l of the gripping means are retrieved from the storage means 4. Also, since the drive timing of the gripping means and the drive timing of the press can always be optimally controlled, efficient workpiece transport control can be performed.

[Brief explanation of drawings]

Figure 1 is a schematic front view of the press equipment used in the present invention, A, B, and C are diagrams in different states, Figure 2 is a die selection chart, and Figure 3 is the press equipment used in the present invention. Block diagram of an electrical circuit. 1, 2...Press machine, 3...Gripping means, 4...
Memory means, 5...Gripping means position detector, 6...Upper mold position detector, 7...Mold selection switch, 9...
CPU.

Claims (1)

[Claims] 1. In a method of controlling a press machine having a workpiece conveyance device between adjacent press machines for conveying a workpiece from one press machine to another press machine, the method includes: a gripping means that grips and moves the workpiece that moves up and down when the gripping tool reaches the position of the press mold; a gripping means position detector that measures the distance from the top dead center of the upper mold, an upper mold position detector that measures the distance from the top dead center of the upper mold, a mold selection switch that selects the type of mold, and the mold selection switch. and storage means for storing the non-interference position of the upper mold and the non-interference position of the gripping means which are called up by the mold, and when the gripping means returns from the mold, the value measured by the gripping means position detector is stored in the storage means. The press machine is driven when the press reaches the non-interference position, and the gripping means starts moving when the upper die is raised after the press process is completed and the value measured by the upper die position detector reaches the non-interference value. A method for controlling a press device, characterized in that: