JPS5952040B2 - Method and device for correcting crankshaft stop position in punch press machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for correcting the stop position of a crankshaft in a punch press machine.

In punch press machines, the ram is moved up and down via a crankshaft that is intermittently driven by the press motor, and when the crankshaft is stopped, that is, the ram and upper die are in the upper position, the workpiece is will be moved.

If the crankshaft's stopping position is within a certain angular range near the top dead center, there will be sufficient clearance below the upper mold, and the workpiece will move smoothly without any problems. If it deviates from a certain angle range near the dead center, the next operation such as moving the work table will be performed while the mold remains in the work, resulting in damage to the apparatus.

In order to avoid the above situation, a rotary limit switch is installed on the crankshaft to detect the crankshaft's stop position, and if the stop position is outside a certain angle range near top dead center, the device will be turned off. It is common practice to stop it. After the device is stopped, the crankshaft is manually rotated to the top dead center position, or the motor is switched to a low rotational speed and the crankshaft is rotated to the top dead center position. When sumo wrestlers' brakes and clutches wear out due to long-term use, they tend to deviate from top dead center as described above, and more frequently. This has been further promoted by the increase in the rotational speed of motors and crankshafts as speeds have increased.

When the above-mentioned brake and clutch habitually drift away from top dead center due to wear, the operator stops the punch press one by one and replaces the brake and clutch rotary screws attached to the crankshaft. I tried to re-adjust the position of the switch, but the position adjustment was cumbersome and caused a stagnation of work.Moreover, it was a rough adjustment that relied on the intuition of the operator, and it was difficult to adjust the position of the crankshaft. Coupled with the increasing speed of rotation, it has been difficult to bring the crankshaft to an accurate stopping position near top dead center again.

The above problem is particularly serious in turret punch presses in which tools can be changed using a turret, since a larger clearance is required when changing tools.

Therefore, the inventor of the present invention conducted extensive research on the above points, and found that deviation of the crankshaft from top dead center (often due to excessive rotation, that is, excessive rotation in the forward rotation direction) is simply caused by the crankshaft moving away from top dead center. Correcting the on/off timing of the brake or clutch by the same angle as the shaft's deviation angle from top dead center will not correct the deviation; It is unique for one operating state depending on the operating conditions such as. We found that it is only necessary to correct the on/off timing of the brake or clutch by an angle multiplied by a coefficient determined by Even if it comes out of dead center, it is out of the category. They succeeded in inventing a method and device that can correct this problem as quickly and accurately as possible without stopping the device, and maintain the proper state.

Examples of a turret punch Z press in which the present invention can be particularly suitably used will be described below in detail.

The turret punch press machine 1 shown in FIG.
The flywheel 2 is constantly driven to rotate by the motor M, and rotational motion is intermittently transmitted to the crankshaft 4 by turning on and off the clutch 3. 8 is used to move the punch, and 10 is a brake fixed to the machine frame side (not shown), but the crankshaft 4 of this punch press machine 1 is not equipped with a rotary switch, and instead, the rotary switch is attached to the crankshaft 4 end. Toothed pulley 11 fitted into
and a toothed pulley 1j13 which is connected to the toothed pulley IJII by a toothed belt 12.
An interlocking shaft 14 interlocked with the crankshaft 4 is provided, and an angle detecting device 15 for the crankshaft 4 is provided on the interlocking shaft 14. The toothed pulley 11 and the toothed pulley 13 are set to have the same diameter and the same number of teeth, and are connected to the crankshaft 4 and the interlocking shaft 1.
4, that is, the shaft 15a of the angle detecting device 15 is configured to rotate by exactly the same angle, and this angle detecting device 15 uses differential changes in variable magnetic resistance to transmit an absolute value output proportional to the rotation angle. The angle signal 16 from the detection device 15 is constantly sent to a switch circuit 18, which will be described later, and its stop angle position signal 17 is
is sent to the following arithmetic and command unit 21 installed in the control box 20 of the turret punch press machine 1.

That is, as shown in FIG. 2, the calculation command device 21 includes a stop position setter 22 that manually sets the stop angle (position) of the crankshaft 4;
a comparison calculator 24 that compares the angle signal 23 from 2 and the stop angle signal 17 from the stop position (angle) detection device 15 of the crankshaft 4 and calculates the difference angle 29;
A coefficient is preset according to the rotational speed of the crankshaft based on a signal 26 from a temperature measuring device 25 of the brake 10 attached to the brake 10 (in the case of this embodiment, this coefficient is also 0.1 to 1.0). It consists of a correction coefficient setting device 28 that finely adjusts the correction coefficient signal 27 (which can be manually changed within the range of Comparison calculator 2
The difference angle signal 29 from 4 is also sent to the monitor in the control box 20 and displayed on the digital display 31, and the difference angle signal 29 is also sent to the monitor in the control box 20 and is displayed on the digital display 31.
If the angle is within the range of ~+15 degrees, the stop position may not need to be corrected.

The correction angle signal 32 multiplied by the correction coefficient from the correction value calculator 30 is sent to the brake/clutch on/off angle memory 33
This signal is sent to the brake/clutch on/off switch circuit 18 consisting of the brake/clutch on/off switch circuit 18, and the brake/clutch on/off angle memory 33 stores the brake/clutch on/off angle memory 33 for turning on at a preset turning angle, for example, 300 degrees for the brake, 340 degrees. In the case of a clutch, a correction angle signal 32 from a correction value calculator 30 is added to the angle of turning off at 200 degrees and turning on at 350 degrees, and the preset on/off angle is corrected. The brake solenoid circuit 34 and the clutch solenoid circuit 35 are turned on and off based on the angle signal 16 from the angle detector 15 based on the corrected on-off angle.

In this embodiment, the brake-related correction value and the clutch-related correction value are uniformly corrected with the same correction value based on the same correction coefficient, but the brake-related correction coefficient and the clutch-related correction coefficient are separately corrected. It is also possible to set the angle of entry and exit angle to be corrected using separate correction values.

Since the apparatus of this embodiment has the above-described configuration, the stop position setter 22 is used to set the desired stop position, for example, normally O.
(0 point in Figure 3), and manually set the correction coefficient of the correction coefficient setter 28 to an appropriate value according to the rotational speed of the crankshaft.For example, a two-stage mode with high and low crankshaft speeds If a low speed is selected, the stop position detector 15 detects the stop position of the crankshaft 4 and sends a signal to the stop angle position (point A). 17 as a comparison calculator 24
and then calculate the deviation angle from the set position (A) to A).
(+40 degrees in the case of Fig. 3), and the calculated difference angle 29 is used in the correction value calculator 30 to slightly correct the temperature of the previously set coefficient value (0.5). Multiplied by the added correction coefficient (for example, 0.55), the correction angle value 3
2, in the case of Fig. 3, 22 degrees is output, and the resulting brake engagement angle (BI point) and brake turning angle (BO point) are 22 degrees, respectively.
It has been revised to (BV point) (BO'' point),
The clutch disengagement angle (CO point) and engagement angle (CI point) are both 22.
It has been revised to (CO'' point) (C-dong point),
The stopping position of the crankshaft is brought to top dead center (0 point).

If the above operation does not bring the stop position to the top dead center, the settings of the correction coefficients are manually changed and the settings are reset so that the stop position is brought to the top dead center.

' For example, if the stop position is still too far, that is, if a + difference angle occurs, the correction coefficient may be increased slightly, that is, in the above example, 0.5 may be changed to 0.6.

In addition, in the above example, the engagement and disengagement angles of the clutch as well as the brake were corrected, but the disengagement range of the clutch (CO to CI) may be set in advance to be large, and the engagement and disengagement angle of only the brake may be corrected. The clutch engagement angle (a) may be set to a constant angle detected by a rotary switch, for example, and the clutch engagement angle (CO) and brake engagement angle (BI.BO) may be corrected. If the engagement angle of the clutch is kept constant and the cutting angle between the brake and clutch is adjusted, the clutch engagement interval (CI-CO) may gradually decrease due to the correction of the cutting angle (CO point). In some cases, the clutch engagement section (CI-CO'') is insufficient because the punch force transmitted to the mold is insufficient.
Preferably, an appropriate alarm is provided if the angle decreases beyond a certain angle.

In addition, when correcting the above-mentioned brake engagement angle only, the brake engagement angle (BI point) should be adjusted in the clutch engagement section (
It is preferable to provide suitable interlock and alarm mechanisms to prevent entry into the CI-CO.

Furthermore, in the above-mentioned example, the brake/clutch on/off switch circuit 18 is configured with a brake/clutch on/off angle memory 33, and the correction angle signal 32 sent from the correction value calculator 30 is stored in the memory. However, if the rotational speed of the crankshaft is determined in advance, a converter for converting the correction angle value into a correction time value may be attached next to the correction value calculator ( (not shown)
The on/off timing of the brake or clutch may be advanced or retarded via a relay based on the corrected time value converted by the converter.

In this case, the crankshaft stop position detection device 1
5 is made into a single-function device that only detects the stop position, instead of being used as an angle detector as in the previous example, and detection of the on/off angle of the brake and clutch can also be made to depend on the conventional re-rotary switch. Become. As is clear from the above explanation,
According to this invention, the troublesome and difficult position adjustment work of the rotary switch, which relies on the operator's intuition, as mentioned at the beginning, is completely unnecessary, and the crankshaft can be adjusted from the top dead center. Even if dislodgment occurs, it can be corrected as quickly and accurately as possible without stopping the punch press machine for a long time, especially by the heat generated in the brake or clutch part as the work progresses. Even when the degree of deviation from the top dead center changes by one degree, the correction coefficient is changed according to the magnitude of the generated heat, so the crankshaft can always be stopped at the optimum stopping position.

Therefore, the working efficiency of the punch press machine can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a turret punch press machine equipped with the device of the present invention, and FIG. 2 shows an arithmetic and command unit, a brake,
Block diagram showing the clutch on/off switch circuit, Part 3
Figure A is a diagram showing the brake on/off angle.
The figure is a diagram showing the engagement and disengagement angles of the clutch. 1... Turret punch press machine, 3...
...Clutch, 4 ...Crankshaft, 1
0... Brake, 15... Stop position detection device, 17... Stop angle signal, 18...
...On/off switch circuit, 22...Stop position setter, 23...Stop angle signal, 24...
Comparison calculator, 25...Temperature measuring device, 27...
... Correction coefficient signal, 30 ... Correction value calculator,
32...Correction angle value signal.

Claims (1)

[Claims] 1. Compare the stopping angle of the crankshaft with the set angle,
A correction angle value is calculated by multiplying the difference angle between the set angle and the stop angle by a coefficient determined by the rotational speed of the crankshaft and a coefficient determined by the temperature of the brake section or clutch section. A method for correcting the stop position of a crankshaft in a punch press machine, the method comprising correcting the crankshaft brake or the on/off angle of the brake and clutch based on the value. 2. A stop position detection device that detects the stop angle of the crankshaft, a comparison calculator that compares the stop angle detected by the stop position detection device with a set angle, and calculates the difference angle, and an output from the comparison calculator. a correction value calculator that calculates a correction angle value by multiplying the difference angle by a correction coefficient; a correction coefficient setting device that provides the correction value calculator with a correction coefficient according to the rotational speed of the crankshaft; A temperature measuring device attached to the brake or clutch is connected to the setting device and provides data for further correction of the correction coefficient according to the rotational speed of the crankshaft, and the crankshaft is adjusted based on the angle value corrected by the above correction angle value. A crankshaft stop position correction device for a punch press machine, comprising a shaft brake or a switch circuit for turning on and off the brake and clutch.