JP3647014B2 - Servo press machine diagnostic device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a diagnostic apparatus for a servo press machine that gives a reciprocating motion to a slide by a servo motor, and automatically measures the press work load, calculates and displays specifications necessary for safe driving, and outputs the safety. This is effective when you want to set the operating range automatically.
[0002]
[Prior art]
The operation state monitoring device of the press machine stores, for example, operation state data in which a divided time in one stroke or a crank angle and an operation state value of each part are associated with each other as in JP-A-6-63798, While displaying this as a graph, the operation state numerical value of the point on the specified graph was compared, a difference value was displayed, and the operation state was monitored by the change of the difference value.
[0003]
[Problems to be solved by the invention]
The above-described operation state monitoring device is used as a determination material for stopping the press machine when the difference value between the operation state numerical values exceeds a certain limit.
If the load of the press work is an overload state from the beginning, the above-mentioned apparatus will stop the press machine, which means that this press work cannot be handled by this press machine. It must be handled by another press machine with a large pressing capability.
[0004]
However, in the case of a press machine using a servo motor as a drive source, even if an overload acts on the servo motor, there is a time that can be operated according to the overload until overheating. As long as the maximum continuous rated load is 100% of the current load factor of the servo motor, it is possible to perform press work in continuous operation, exceeding this maximum continuous rated load, and 300% of the servo motor current load factor. In the range where the maximum load is specified, the press work in intermittent operation has been performed.
In the range from this maximum continuous load rating to the maximum specification load, high-mix low-volume production is suitable, but because it is performed intermittently, productivity cannot be improved.
[0005]
The object of the present invention is to solve the above-mentioned problems and to monitor the current load range of the servo motor for press work from normal to overload, and press work in continuous operation within a specified time even in overload It is an object of the present invention to provide a diagnostic apparatus for a servo press machine that enables the above.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention was calculated and the current waveform of the servo motor during flop-less working, and a display unit for displaying a load factor of the current, from the specification of data and the measured data data Servo press that reciprocally drives the slide with a servo motor that has a data display section that displays numerical values, a setting section that sets and inputs the conditions required for measurement, and an input section that inputs the required numerical values to the setting section In machine diagnostic equipment,
[0007]
On the display the current waveform in Table radical 113, the load factor of the current, i.e., the average current, continuous pressing operation is enabled range in the continuous operation of up to shutdown by the operator's will in the following maximum continuous rated load In addition, at least two ranges that can be pressed during continuous operation within the specified time from the maximum continuous load rating to the maximum specification load are displayed by color, and can be judged intuitively by visual recognition.
[0008]
Furthermore, in the above-described servo press machine diagnostic apparatus, the data display unit displays the current load factor of the servo motor and the operable time in continuous operation that is measured and set in advance at the current load factor. The required output signal for the operation time can be transmitted.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of a diagnostic apparatus for a servo press machine according to the present invention.
As shown in FIG. 1, the diagnostic device 1 includes a display unit 2, a data display unit 3, a setting unit 4, and an input 5.
[0010]
The display unit 2 measures the current value of the servo motor that drives the slide up and down when a servo press machine (not shown) performs the pressing operation in a continuous operation. The current value is the vertical axis and the current is the horizontal axis. Displayed as waveform 6.
The data display section 3 includes the number of strokes per minute (spm) of the slide of the servo press machine when the current waveform 6 is obtained, the ratio (%) of the measured peak current value to the rated current value, and the current waveform. The load factor calculated from the mean square value of the current of 6 is displayed, that is, the ratio (%) of the average current value to the rated current value, and the continuous operation possible time (time) set in advance by measuring at this load factor.
[0011]
The setting unit 4 includes a touch switch 7 for displaying the number of strokes of the slide to be measured at the beginning of the press work, and a 2-point press machine in which the servo press machine is driven by two servo motors. A selection touch switch 8 for selecting and displaying either the left or right of the measured current value and a start button 9 for starting measurement are provided.
In the one-point press machine, the touch switch 7 for the number of measurement strokes touches and lights up, and then inputs the number of times through the input unit 5.
When the selection touch switch 8 is touched to the left and is lit, the current waveform 6 of the left servo motor is displayed on the display unit 2, and the right servo motor can be operated similarly. When the left and right selection touch switches 8 are lit on both left and right, the display unit 2 is divided into left and right, and the current waveform 6 of the left and right servo motors can be displayed simultaneously on the left and right.
[0012]
When the touch switch 7 of the setting unit 4 is touched and lit, an input mode in which the input unit 5 can input numerical values is set.
Therefore, when the number of measurement strokes, for example, 10 is input and the input button 10 is pressed, the number of measurement strokes is displayed on the touch switch 7 as “10”.
When the start button 9 for starting measurement is pressed during the pressing operation, the measurement starts when the slide comes to the top dead center, and the display unit 2 displays that the measurement is in progress.
When the number of measurement strokes is 10, the measurement ends.
[0013]
After the measurement is completed, the measurement data stored in the control device (not shown) is read by touching the selection touch switch 8 to display the current waveform 6 on the display unit 2.
At the same time, the load factor calculated from the mean square value of the current by the control device, that is, the average current is displayed on the current waveform 6 of the display unit 2 as the horizontal line 11 and the percentage (%) of the average current of the data display unit 3 is displayed. To do.
[0014]
The horizontal line 11 is, for example, a green line when the load factor is 0 to less than 90% within a range where the pressing operation in the continuous operation can be performed below the maximum continuous rated load, and a yellow line when the load factor is less than 90 to 100%. When 100% or more within the range in which the pressing operation can be performed in the continuous operation within the specified time exceeding the maximum continuous rated load and within the specified time, it is displayed by three types as shown by the red line. Thereby, it becomes possible to judge by intuition by visual recognition.
[0015]
The positions corresponding to the top dead center and the bottom dead center of the current waveform 6 are displayed as a top dead center mark 12 and a bottom dead center mark 13.
[0016]
As an example of the measurement, when the data display unit 3 displays the number of strokes 60 spm, the peak current 300%, the average current 150%, and the operable time 1 hour, the position of the current 150% on the current waveform 6 of the display unit 2 A horizontal line 11 of red line is displayed on the screen, and it can be seen that the pressing operation cannot be continuously performed in the same manner as the maximum continuous rated load or less, and the continuous operation time is 1 hour.
When the time during which this continuous operation is possible elapses, the servo press machine is automatically stopped and controlled by an interlock such that the restart is impossible until the temperature of the servo motor is lowered to a predetermined temperature.
[0017]
Similarly, when performing press work in intermittent operation where continuous operation cannot be performed, or when performing press work in intermittent operation over the entire range up to the maximum specified load as in conventional servo press machines, set in advance as well. When the temperature of the servo motor exceeds a certain temperature, the servo press machine automatically stops and cannot be restarted until the temperature of the servo motor drops to a preset constant temperature.
[0018]
When the load factor is 100% or less, the operable time is displayed as “--time”, and the continuous continuous pressing operation until the operation is stopped by the operator's will is possible.
[0019]
The measurement is completed at the beginning of the press work, the load factor can be visually recognized in the color of the horizontal line 11, the operation possible time in continuous operation is displayed, and the operation processing time can be automatically set and interlocked. Can perform press work with peace of mind.
In addition, in response to multi-product small-volume production, it is possible to easily grasp the number of products and to process products with a load factor of 100% or more in a continuous operation with peace of mind.
[0020]
In this embodiment, the information to be monitored is the current value of the servo motor. However, the torque and temperature of the servo motor or the temperature and elongation of the press machine and the mold may be targeted.
[0021]
【The invention's effect】
As is apparent from the above description, according to the present invention, the current value of the servo motor is measured with several strokes at the start of the press work of a new product, and data for the subsequent press work can be obtained. The load factor can be judged by looking at the color of the horizontal line on the current waveform, and when the load factor exceeds 100%, the operable time in continuous operation is displayed, and the setting of the operable time in continuous operation and Since the interlock signal can be obtained, the press work is safe and the burden on the operator is reduced.
[Brief description of the drawings]
FIG. 1 is a front view of a diagnostic device for a servo press machine.
1 is a diagnostic device, 2 is a display unit, 3 is a data display unit, 4 is a setting unit, 5 is an input unit, 6 is a current waveform, 7 is a touch switch, 8 is a selection touch switch, 9 is a start button, and 10 is an input A button, 11 is a horizontal line, 12 is a top dead center mark, and 13 is a bottom dead center mark.

Claims (2)

(B) A display unit that displays the current waveform and current load factor during the press operation of the servo motor during the press operation, and (b) the measured data and the data calculated from the data are displayed numerically. The slide is driven reciprocally by a servo motor having a data display unit for performing, (c) a setting unit for setting and inputting conditions necessary for measurement, and (d) an input unit for inputting required numerical values to the setting unit. In the servo press machine diagnostic device, on the current waveform displayed on the display unit, the current load factor, that is, the average current, is continuously below the maximum continuous rated load until the operator stops the operation. Visually display and visually display at least two ranges, the range in which continuous pressing operation is possible and the range in which continuous pressing operation is possible within the specified time from the maximum continuous rated load to the maximum specified load. Diagnostic apparatus for a servo press machine, characterized in that the possible decision in more intuitive. 2. The servo press machine diagnostic apparatus according to claim 1, wherein the data display unit displays a current load ratio of the servo motor and an operable time in continuous operation that is measured and set in advance at the current load ratio. A diagnostic apparatus for a servo press machine capable of displaying and outputting a required output signal for the operable time.

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