JPH081396A - Monitor for press life - Google Patents

Abstract

PURPOSE:To accurately grasp the degree of fatigue of a press body by accumulating such degree of fatigue that is different depending upon working contents and then outputting it. CONSTITUTION:The monitor is constituted of a means 7 for detecting a load applied on the press body 1 at the time of press operation, and a means 10 for judging working contents from the detected press load, calculating the ratio of a maximum load to a press capacity for each working content, calculating also a life coefficient from such ratio and accumulating the coefficients. Consequently, since the degree of fatigue that is different by each working content is accumulated and outputted, the degree of fatigue of the press body 1 is accurately grasped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press life monitor for accumulating and outputting the degree of fatigue of a press, which is different for each processing content.

[0002]

2. Description of the Related Art Generally, in a press, fatigue is accumulated in a press body due to a load generated during molding, and when the fatigue degree exceeds a limit, a failure occurs or the press body is damaged. For this reason, in the past, parts that have reached the limit of fatigue by overhauling the press body at an appropriate time,
Maintenance such as replacing worn parts with new parts. In addition, a device that displays the load applied to the press body during molding on an indicator so that the degree of fatigue of the press can be judged is, for example, Japanese Utility Model Publication No. 3-53838.
It is proposed in Japanese Laid-Open Publication No. 5-34538.

[0003]

However, the fatigue accumulated in the press body greatly differs depending on the work contents such as drawing work and punching work. For this reason, the conventional method of detecting and displaying the load generated during press work regardless of the work content cannot accurately grasp the fatigue level accumulated in the press body, and as a result, the maintenance time is incorrect. There was a problem such as a serious accident. The present invention has been made to improve such a problem, and provides a press life monitor capable of accurately determining maintenance time by accumulating and monitoring different fatigue levels according to work content. It is intended.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a means for detecting a load applied to a press body during a press work, a processing content is judged from the detected press load, and each processing content is determined. The means for calculating the maximum load and the press capacity ratio, the means for calculating the life coefficient from the calculated ratio of the maximum load and the press capacity, the means for accumulating the calculated life coefficients, and outputting the accumulated life coefficient And means for doing so. Further, the life coefficient accumulated by the accumulating means is recorded, the recorded life coefficient is compared with a preset threshold value, and when the life coefficient reaches the threshold value, this is displayed. .

[0005]

[Operation] With the above configuration, the fatigue level that differs depending on the processing content can be accumulated and output, so that the fatigue level of the press body can be accurately grasped. Further, when the cumulative fatigue coefficient reaches a preset threshold value, it is displayed on the display unit or the like, so that the maintenance time can be easily determined by looking at the display unit.

[0006]

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a press provided with a press life monitor, and FIG. 2 is a block diagram of the press life monitor. In FIG. 1, reference numeral 1 denotes a press body, which has a slide 2 that can move up and down, and a mold 3 including an upper mold 3a attached to the lower surface of the slide 2 and a lower mold 3b fixed on the bolster 1a. The work (not shown) can be pressed.

Reference numeral 4 in FIG. 1 denotes a connecting rod which constitutes a part of a slide drive mechanism (not shown) provided on the upper part of the press body 1, and has a lower end of the slide 2 via a screw shaft 5 for die height adjustment. For example, point 6 provided in two places
The load detector 7 composed of a pressure gauge or a strain gauge is provided on the point 2 or the connecting rod 4 and the load detected by the load detector 7 is input to the press life monitor main body 10. It has become so.

The press life monitor body 10 is shown in FIG.
As shown in, the amplifier 11 that amplifies the signal input from the load detector 7, the A / D converter 12 that converts the analog signal output from the amplifier 11 into a digital signal, and the life factor depending on the work content An arithmetic processing unit 13 for calculating,
It comprises a memory 14 for accumulating and storing the calculation results, and a display section 15 for displaying the accumulated fatigue level in color with a lamp or a bar-shaped LED, or expressing with voice or characters.

Next, referring to the drawings shown in FIGS. 3 to 6, the operation will be described. In the memory 14 of the press life monitor main body 10, the fatigue coefficient against the press load shown in FIG. 3 and (a) in FIG. The load curve corresponding to the processing content shown in (c) to (c) is stored in advance as data. That is, FIG. 4A shows the drawing process, FIG. 4B shows the blank trimming process, and FIG. 4C shows the restlike process.

When the press work is started in step 101 of the flow chart shown in FIG. 5, the processing content is judged based on the load curves shown in FIGS. 4 (a) to 4 (c) in step 102. The process proceeds to step 103, to step 103 'in the case of blank trim processing, and to step 103 "in the case of restrike processing. In the case of drawing processing, the load-fatigue coefficient curve previously stored in the memory 14 in step 103. Processing unit 13 based on
After calculating the ratio of the positive load maximum load and the press capacity by, the life factor is calculated in step 104, and the fatigue degree is accumulated in the memory 14 in step 105 to be accumulated in the fatigue degree already stored. It

Further, in the case of blank trim processing, after the ratio of the positive and negative load maximum load and the press capacity is calculated by the arithmetic processing unit 13 in step 103 ', step 10' is executed.
The life factor is calculated at 4 ', and the fatigue level is cumulatively stored at step 105. Further, in the case of the restrike processing, after the ratio of the positive load maximum load and the press capacity is calculated by the calculation processing device 13 in step 103 ″, step 10 ″
The life factor is calculated at 4 ″, and the fatigue level is cumulatively stored at step 105.

On the other hand, the arithmetic processing unit 13 executes step 106.
Then, the fatigue level cumulatively stored in the memory 14 is compared with a preset threshold value. If the cumulative fatigue level is smaller than the threshold value, the process proceeds to step 107 and no processing is performed. If the fatigue level is equal to or greater than the threshold value, the process proceeds to step 108, and the fact that the fatigue level exceeds the limit is output to the display unit 15.

When a bar-type LED display device as shown in FIG. 6 is used for the display unit 15, the cumulative fatigue level stored in the memory 14 is output to the display unit 15 for color display. That is, when the cumulative fatigue level is smaller than the threshold value, the green LE
D15a is turned on, and the yellow LED 15b is turned on when the threshold value is approached. If the threshold value is exceeded, the red LED 15c is turned on, and the operator can easily determine how much the fatigue level is accumulated by looking at the display unit 15. Further, in the case of warning that the fatigue level has reached the limit by voice or text, the warning may be issued by the signal output in step 108.

[0014]

As described in detail above, according to the present invention, the fatigue level which differs depending on the processing content is calculated and the fatigue level obtained for each processing content is accumulated and recorded. The fatigue level accumulated in the main body can be judged more accurately than the recorded results. As a result, the maintenance time of the press main body is less likely to be mistaken, and it is possible to prevent a serious accident or failure from occurring. Also, by displaying the accumulated fatigue levels in different colors on the display unit, the fatigue level accumulated in the press body can be easily grasped just by looking at the display unit, and a threshold value can be set in advance. By comparing the threshold value with the cumulative fatigue level and issuing an alarm when the cumulative fatigue level exceeds the threshold value, it is possible to reliably notify the operator of the maintenance time.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a press adopting a press life monitor according to an embodiment of the present invention.

FIG. 2 is a block diagram of a press life monitor according to an embodiment of the present invention.

FIG. 3 is a diagram showing the relationship between load and fatigue coefficient.

4A to 4C are diagrams showing the relationship between the load and the crank angle, which are different depending on the processing content.

FIG. 5 is a flowchart showing the operation of the press life monitor according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a display example of a press life monitor according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Press body, 2 ... Slide, 7 ... Load detector, 10
... press life monitor, 15 ... display section.

Claims (2)

[Claims] 1. A means for detecting a load applied to a press body during press work, a means for judging a processing content from the detected press load, and a means for calculating a maximum load and a press capacity ratio for each processing content. A press life monitor comprising: a means for calculating a life coefficient from the ratio of the maximum load and the press capacity; a means for accumulating the calculated life coefficients; and a means for outputting the accumulated life coefficient. 2. The life factor accumulated by the accumulating means is recorded, and the recorded life factor is compared with a preset threshold value, and when the life factor reaches the threshold value, it is displayed. The press life monitor according to claim 1, wherein