JPH0112600B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is used in a processing machine such as a turret punch press machine (hereinafter referred to as an NC turret punch press machine) controlled by an NC control device. This invention relates to an override confirmation device that detects when a material gripping device comes directly under a striking tool during processing, and can always confirm whether or not the striking tool is suitable.

NC turret punch press machines like the one shown in Figure 1 are generally equipped with an override confirmation function. This NC turret punch press machine 1 is
The rotatable upper and lower turrets 3 and 5 are each equipped with a large number of punches 7 and corresponding dies 9, and one of the many sets of punches 7 and dies 9 is positioned below the striking element 11, A machine that positions a desired processing position of a material 15 held by a material gripping device 13 between a punch 7 and a die 9 below a striker 11 by a combination of feeding in the X and Y directions, and performs punching and other processing. It is. The override confirmation mechanism in this machine means that due to the processing position of the material 15, the material gripping device 13 is located too close to the die 9 and is located in the vicinity of the processing area by the punch 7 and die 9. A case in which there is a risk that the gripping device 13 is punched is detected as an override, and only the positioning of the material 15 is performed without performing processing such as pressing, so that the operator does not use the punch 7 to punch the material gripping device 13. This function allows processing to continue only after confirming whether or not pressing is to be performed and then pressing a switch 17 provided at an appropriate position.

The detection of the override is performed by the material gripping device 1.
3 moves in the Y-axis direction and approaches the machining area of the punch 7 and die 9 from the Y-axis direction by a preset limit switch and cam in the Y-axis direction, and similarly The approach of the material gripping device 13 to the area from the X-axis direction is detected by a limit switch and a cam in the X-axis direction, and when both limit switches are activated, the material gripping device 13 approaches the processing area. (area indicated by diagonal lines in FIG. 3). Since such override detection is well known, a more detailed explanation and illustration will be omitted.

In the NC turret press machine, in order to minimize the unprocessed area of the material 15, the material gripping device 13 is placed inside the upper and lower turrets 3 and 5 as shown in Fig. 2, so this override check is required. Functionality is necessary. Therefore, to describe the conventional override confirmation device in more detail, when the material gripping device 13 enters the override area indicated by diagonal lines in FIG. The punch 7 and the die 9 may or may not punch out the gripping device 13 depending on whether the inner die is selected or the outer punch is selected. For this purpose, the gripping device 13 is placed in the override area (near the processing area) during processing.
In this case, when the press start signal is output, the press start signal is waited for, and the gripping device 1
If it is visually confirmed that the press 3 is not punched out, a confirmation switch 17 outputs a press start signal. When there is a possibility of punching out the gripping device 13, the operator changes the position of the gripping device 13 or the machining program. This feature greatly expands the processing range of materials. However, this confirmation device only works when the override (on/off) switch, which indicates override when the gripping device enters the override area and puts the press in standby mode, is turned on. Because it is,
If the override (on/off) switch is in the "off" state, even if there is a possibility of entering the override area and punching out the gripping device 13, a press start signal will be sent and the punch will be performed.
There was a problem that the gripping device was punched out together with the material.

This invention was made to solve such conventional problems, and when machining products with the same program shape multiple times in a row, the first
Even if the override (on/off) switch is set to ``off'', it will be forced to ``on'' only during the second machining, and if override is detected, only material positioning will be performed, and punching or other operations will be performed. Before processing, the worker should be able to check whether the punch will not punch out the material gripping device, and the gripping device could be removed because the worker neglected to check whether the override switch was turned on or off. To provide an override confirmation device capable of preventing damage.

This invention will be explained in detail below along with embodiments shown in the figures. FIG. 4 shows a flowchart of a conventional example, and FIG. 5 shows a flowchart of an embodiment of the present invention.

This embodiment is used in the NC turret punch press machine 1 shown in FIG. The item currently being machined is being machined for the first time with a completely new program, or the item with the same program was previously machined, and the item currently being machined is the second time the same program has been continuously machined. It is determined whether it is a subsequent one.

The determination as to whether this is the first processing is as follows.

a Conditions for determining the start of the first processing.

(1) When the NC power is turned on.

(2) When an emergency stop occurs and is subsequently released.

(3) When the mode is set to other than memory mode.

(4) When searching for a program number in memory mode.

(If you do this, a completely new program and completely different product will be searched for.) b Conditions for determining that the first machining is complete.

When actual machining is performed in the memory mode that is determined to be the first machining start, and a program end or tape end signal is output.

(However, this does not apply when the punch is turned off.) If it is the first time, the override (on/off)
OFF) Even if the switch is set to ``OFF'', it is forcibly set to ``ON'', and only positioning of the material 15 is performed, and no processing is performed, so the operator does not want the punch 7 to strike the material gripping device 13. Visually check whether pressure is to be applied or not, and if pressure is to be applied, change the program or the material gripping device, and then press the confirmation switch 17 to continue processing.

When it is determined that this is the second or subsequent processing, if the override switch is turned on,
Only positioning is performed, no machining is performed, and the machining is continued when the operator presses the confirmation switch 17 after confirmation. If the override switch is set to ``off'', processing will continue as soon as the operator confirms it. However, even in this latter case, the same program has already been processed, so
The amount of movement of the material 15 and the gripping device 13 should be the same, and if an override is detected when the program is processed for the first time, the operator will naturally have corrected it at that time, so Overrides will not be detected during processing and will not damage the material gripping device 13.

In this regard, in the case of the conventional example shown in Fig. 4, since there is no step to determine whether or not it is the first machining, a confirmation step is taken from the first machining only by turning on/off the override switch in the override area. , which is very different from being decided whether or not to take it.

FIG. 6 is a block diagram of this embodiment, and FIG. 7 is a timing chart thereof. The first override determination device 21 receives signals such as schedule operation start, end, punch input, search end signal, program end (M02), tape end (M30), memory mode, etc., and determines whether or not it is the first machining. Output. If it is the first time, the signal is input to the OR gate 23 and becomes "override valid" regardless of whether the override switch 25 is on or off. If it is determined that it is the second or subsequent time, the override is set to be "valid" or "invalid" depending on the on/off state of the override switch 25.

In the “override enabled” state, depending on the presence or absence of the press start signal in the override area.
An input is received from the AND gate 27 to the AND gate 29, and the state is set to "wait for press start". In this state, the press is started for the first time when the operator operates the override confirmation switch.

In the "override disabled" state, the press is activated immediately when the output from the AND gate 27 is input to the AND gate 31.

To further explain this operation with reference to the timing chart of FIG. 7, when the power is turned on at time a in the figure, the override is valid regardless of whether the override switch is on or off. Also b
As shown in , override is valid during machining of a completely new program, so if override is detected, only positioning is performed and no machining is performed. At time c', it is determined that the first machining is completed, and if a product of a different program is subsequently called up, it is determined that a completely new program is to be executed again, and the override becomes valid again. (In this diagram, the override switch is set to ``off''.
It remains in its natural state. ) As can be understood from the above description of the embodiments, in short, the present invention includes an override detection means for detecting that the material gripping device 13 is located near the processing area by the punch 7 and the die 9 in a punch press; An override enabling means that enters override regardless of whether the override switch 25 is turned on or off when the material 15 gripped by the material gripping device 13 is the first sheet, and this override enabling means and the override detection means. a press start waiting means for setting the press start waiting state in response to the input of the press start waiting means; a confirmation switch 17 for canceling the waiting state of the press start waiting means;
This prevents the operator from punching out the material gripping device due to neglecting to check whether the override switch is on or off, as in the past.

[Brief explanation of drawings]

Fig. 1 is an external view of the NC turret punch press machine, Fig. 2 is a side view of the main parts showing the overriding state of the above, Fig. 3 is a plan view showing the overriding state of the above, and Fig. 4 is the flow of the conventional example. 5 is a flowchart of one embodiment of the present invention, FIG. 6 is a block diagram of the same, and FIG. 7 is a timing chart of the same. 1...NC turret punch press, 3, 5...
Tallet, 7...Punch, 9...Die, 13...
Material gripping device, 15...Material, 17...Confirmation switch, 21...Discrimination device.

Claims (1)

[Claims] 1. Override detection means for detecting that the material gripping device 13 is located near the processing area by the punch 7 and die 9 in a punch press, and when the material 15 gripped by the material gripping device 13 is the first sheet. , override switch 25
override enabling means for entering the override regardless of whether the override is on or off; press start waiting means for setting the press start waiting state by input from the override enabling means and the override detecting means; and press start waiting means. An override confirmation device comprising: a confirmation switch 17 for canceling a waiting state.