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Rotary Tool Diagnosis System

A technology of rotating tools and diagnostic systems, applied in the direction of control systems, manufacturing tools, metal processing equipment, etc., can solve problems such as deviation

Inactive Publication Date: 2020-05-22
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this degradation judgment method, there is a possibility that the actual life may deviate from the empirically predicted life due to the life variation of the cutting tool due to the manufacturing variation of the cutting tool, etc.

Method used

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Experimental program
Comparison scheme
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no. 1 Embodiment approach

[0034] First, a first embodiment of the present invention will be described. The rotary tool diagnostic system according to the present embodiment is a system for diagnosing the soundness of a processing machine (for example, a rotary tool) provided with a plurality of motors for moving and processing a workpiece by measuring its driving current.

[0035] Generally, when a workpiece is processed using a processing machine, the workpiece is moved to a predetermined position and then processed with a rotary tool. The present invention has been made with this task in mind. Specifically, the present invention monitors the current waveforms of a plurality of motors included in the same processing machine, records the current waveform of the main motor that drives the rotary tool using the current waveform of each motor as a trigger, and performs diagnosis based on the current waveform. .

[0036] figure 1 It is a block diagram showing a system configuration example for realizing...

no. 2 Embodiment approach

[0091] Figure 8 It is a block diagram showing an example of a system configuration for realizing the rotary tool diagnosis method according to the second embodiment of the present invention. The signal processing device 870 according to the second embodiment and figure 1 Compared with the case of the first embodiment shown, the selection unit 831 receives the output CONDO1 of the analog front end 110 and the output CONDO2 of the analog front end 120 .

[0092] The signal processing device 870 includes analog front ends 110 and 120 , an arithmetic control unit 830 , a communication circuit 140 , and a power supply circuit 150 .

[0093] The calculation control unit 830 includes a selection unit 831 , an analog-to-digital converter 832 , a data recording unit 833 , an output calculation unit 834 , a comparator 835 (an example of a comparison unit), and a trigger output unit 836 . exist Figure 8 In , the selector is described as "MUX".

[0094] The selection unit 831 select...

no. 3 Embodiment approach

[0107] In the configurations described so far, the power supply circuit 150 included in the signal processing device of the first embodiment and the second embodiment has a configuration including a battery 151 or ambient power generation. On the other hand, as the power supply circuit 150 , a current detected from a power line connected to the motor 163 may be used as a power supply.

[0108] Figure 10 It is a block diagram showing an example of a system configuration for realizing the rotary tool diagnosis method according to the third embodiment of the present invention. Such as Figure 10 As shown, a current detector 166 (fourth current detector) is disposed on the U-phase power line of the motor 160 , and the current obtained by the current detector 166 is supplied to the power supply circuit 150 . exist Figure 10 In an example, it is assumed that the diagnostic unit 100 including the signal processing device 170 according to the first embodiment (refer to figure 1 ...

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PUM

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Abstract

The present invention provides a rotary tool diagnosis system, which can more simply hold the operation timing of the rotating tool to diagnose the rotating tool even if the processing program of theprocessing machine is not disclosed. The rotary tool diagnosis system (100) according to one aspect of the present invention includes a first current detector (162), a second current detector (165), and a signal processing device (170). The first current detector detects a current of at least one power line connected to a first electric motor (160) that rotates a rotary tool. The second current detector detects a current of at least one power line connected to a second electric motor (163) that is used for moving the rotary tool. The signal processing device triggers based on a result of processing on an output signal of the second current detector (165) and starts recording of an output signal from the first current detector (162).

Description

technical field [0001] The present invention relates to a rotary tool diagnosis system for diagnosing a rotary tool such as a cutting tool. Background technique [0002] Processing of metals and the like by rotary tools is utilized in various manufacturing sites. Generally, materials such as iron are processed using cutting tools such as drills and end mills. When the cutting tool is damaged during the processing of the workpiece, the quality of the workpiece may be affected. Therefore, in order to prevent the damage of the workpiece during the processing, it is necessary to make the life of the cutting tool more. use. However, frequent replacement of cutting tools involves an increase in manufacturing costs. Therefore, it is preferable to use the cutting tool only for an appropriate period and number of times, and to replace the cutting tool at an appropriate timing. [0003] As a method of judging the deterioration of a cutting tool, a method of recording the use time ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q17/09
CPCB23Q17/0957B23Q17/0961G06Q50/06H02P5/00G01M15/02G01R19/145G01R19/2513
Inventor 小埜和夫松田光司西村卓真
Owner HITACHI LTD