JPS6046000B2 - Pressing bottom dead center fluctuation detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to provide a bottom dead center fluctuation detection device for press work that displays bottom dead center fluctuations and the extent of the fluctuation during press work at high speed. The objective is to detect abnormalities such as heavy hitting, gas filling, and gas overflow with high accuracy and ease.

Next, the configuration of an embodiment of the present invention will be explained with reference to the drawings. Address bus 2 from the CPUI has a ROM memory element.
3. In addition to being connected to the RAM 4 and I/05 for input/output control, these circuits are also connected to each other via a data bus 6, and the following circuits are connected to I/05.

That is, logical sum control that displays the deviation value of the bottom dead center fluctuation, which is the absolute value of the difference between the previous bottom dead center position and the current bottom dead center position (51 in FIG. 1), in a kind of bar graph 7. The LED 9 via the circuit 8, the digital switch 10 for setting the allowable value of the deviation, and the proximity body 11 that moves up and down in conjunction with the ram of the press machine are connected to the bottom dead center position of the press. Corresponding to A) in FIG. 1, an amplifier 13 that amplifies the output from the proximity switch 12 to generate an output proportional to the distance (52 in FIG. 1) to the proximity object 11 and outputs a timing signal; A digital peak hold 15 that digitally holds the output from the amplifier 13 via the D converter 14 and outputs J bottom dead center position data, a preset switch 16 for changing the set value of the digital switch 10, and the deviation value. LED 18 via an overflow display driver 17 that lights up when the value exceeds the set value by the digital switch 10, and LED 2O via a timing display driver 19 that lights up every time a timing signal is generated from the amplifier 13. , the overflow display LE
In addition to being connected to the stop signal output driver 21 that outputs a breath machine stop signal when Dl8 is lit, I/05 outputs a 1/0 signal for external equipment, and CPUl has a reset switch. 22 is connected,
These switches, LEDs, etc. are arranged on the surface of the bottom dead center fluctuation detection device 23 as shown in FIG.
4 is a power indicator lamp that lights up when the power switch is 250N, 26 is a stop indicator lamp that lights up when the breath machine stop signal is output, and 27 is a sensor connection terminal for connecting the proximity switch 12 of the sensor to the bottom dead center fluctuation detection device 23. be.

Next, FIGS. 3 and 4 are flowcharts of microcontrol for the bottom dead center variation detection device 23, which will be explained in accordance with the control operation.

After the power is turned on, the system initializes and
After resetting 05, read the set value of the digital switch 10, that is, the allowable deviation value (1/05 → ACC) → Store the setting data in RAM (ACC → RAM) → Output the set value of the digital switch 10 (ACC- +I/05) - If there is no timing signal, preset switch 160N
is determined, and if it is 0FF, jump to the timing signal presence/absence determination routine again, and if it is 0N, read the set value →
After the set value is displayed on the LED 9 corresponding to the set value on the pargraph 7, the timing is turned on again. jump to the signal presence/absence determination routine.

Also, during the timing signal presence/absence determination routine, if a timing signal is present, it is determined whether the system routine is the first time, and if it is the first time, after reading the bottom dead center position data, the digital switch 10 set value reading routine resumes again. However, if it is not the first time, read the current bottom dead center position data → After reading the previous bottom dead center position data, the deviation value shown as the absolute value of the difference between the previous bottom dead center position and the current bottom dead center position Compare and determine whether X is greater than or equal to the set value Y set by the digital switch 10, and if the deviation value X is less than or equal to the set value Y, read the deviation value data After 7 is lit, the digital switch 10 jumps to the set value reading routine again.

Also, if the deviation value X is larger than the set value Y, the deviation value data x is read out and the deviation value data
When the maximum set value of 15 (150 μm) is exceeded by the digital switch 10, the overflow indicator LED 18 turns on, the output control circuit is turned 0FF, and the system operation is stopped.
(50 μm) or less, after reading the deviation value data X and displaying the deviation value data After correcting the cause, for example, the workpiece, turn the reset switch 22 to 0.
N and the system operation can be started again.

Therefore, the variation in the bottom dead center position of the ram during pressing can be confirmed in the range of 0 to 150 μm in this example, regardless of whether the pressing is at low or high speed. By checking the bottom dead center fluctuation amount in step 7, the set value by digital switch 10 can be easily set to an appropriate value corresponding to the speed of the press machine, etc. When an abnormality occurs in the breather such as thickness variation, the deviation value In addition to accurately detecting the bottom dead center position deviation in accordance with the actual situation, the deviation value, the allowable value of the deviation value, and the degree of change in the deviation value are displayed on a pargraph-like display with lamps corresponding to the numbers of the deviation value data. By displaying the degree of change in the lighting position of the lamp corresponding to the number of lighting and deviation value data, it is possible to understand at a glance the degree of accuracy with which the workpiece is being pressed, and this can indicate the occurrence of an abnormality. Before doing so, check the condition of the press machine, for example, if the deviation value fluctuates, that is, if the lighting position of the lamps arranged in a pargraph pattern changes,
If the tightening of the mold etc. becomes loose or the deviation value becomes large in rare cases, this is due to machining oil etc. dripping onto the material to be pressed, and there is no effect on accuracy, and the setting value can be readjusted, etc., before the abnormality occurs. By taking measures, brace work can proceed smoothly.

Next, the effects of the present invention will be explained.

The present invention provides a bottom dead center position detection sensor, such as a proximity switch 12, a differential transformer, a linear scale, etc., which generates an output corresponding to the bottom dead center position when the ram of a press machine reaches the bottom dead center. The point position detection sensor detects the deviation value between the previous bottom dead center detection position of the ram and the current bottom dead center detection position by the bottom dead center position detection sensor, and arranges the deviation values in a line in a par graph. In addition to digitally displaying the lighting of numerical lamps, the degree of change in the deviation value is displayed as a par graph by changing the lighting position of the lamp corresponding to the deviation value number, which is caused by the deviation value changing every time the breath completes one cycle of operation. and an indicator that displays the degree of change in the lighting position of the lamps arranged in a shape, and when the deviation value detected by the bottom dead center position detection sensor exceeds a preset tolerance value, the breath There is a bottom dead center fluctuation detection device in the press machine that outputs a signal to stop the operation.

With this, the present invention digitally displays deviation value data by lighting lamps for each number arranged in a row in a pargraph pattern, and detects abnormalities in pressing work such as double hammering, gas filling, and plate thickness fluctuations. It can be easily detected, and when the deviation value data changes every time the breath finishes one cycle of operation, the extent of the change in the deviation value data can be shown on a par graph by changing the lighting position of the lamp corresponding to the number of the deviation value data. It is displayed as the degree of change in the lighting position of the lamps arranged in a shape, and it is also possible to easily detect abnormalities in the press machine, such as loose tightening of molds, etc., based on the magnitude of the change in the lighting position. It has an effect that can be detected.

[Brief explanation of drawings]

Figure 1 is a system block diagram of one embodiment of the present invention, Figure 2 is a system block diagram of an embodiment of the present invention.
The figure is a front view thereof, and FIGS. 3 and 4 are flowcharts of its microcontrol. 1...CPU12...Address bus, 3...RO
Ml4...RAMl5...I/016...data bus, 7...per graph, 8...OR control circuit, 9
...LEDllO...Digital switch, 11...
- Proximity body, 12... Proximity switch, 13... Amplifier, 14... A/D converter, 15... Digital peak hold, 21... Stop signal output driver, 23.
・Bottom dead center fluctuation detection Suinotsuchi.

Claims (1)

[Claims] 1. A bottom dead center position detection sensor that generates an output corresponding to the bottom dead center position when the ram of the press reaches the bottom dead center, and a previous bottom dead center detection position of the ram by the bottom dead center position detection sensor. The deviation value between the current bottom dead center detection position and the current bottom dead center detection position is detected, and the deviation value is digitally displayed by lighting up lamps for each number arranged in a bar graph. and a display device that displays the degree of change in the lamp lighting position arranged in a bar graph, indicating the degree of change in the deviation value due to the change in the lighting position of the lamp corresponding to the deviation value number due to the change in value. and outputting a signal for stopping the operation of the press when the deviation value detected by the bottom dead center position detection sensor exceeds a preset tolerance value. Dead center fluctuation detection device.