TW201334911A - Method and apparatus for detecting the break of the cutter of the machine tool automatically - Google Patents

Method and apparatus for detecting the break of the cutter of the machine tool automatically Download PDF

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Publication number
TW201334911A
TW201334911A TW101106217A TW101106217A TW201334911A TW 201334911 A TW201334911 A TW 201334911A TW 101106217 A TW101106217 A TW 101106217A TW 101106217 A TW101106217 A TW 101106217A TW 201334911 A TW201334911 A TW 201334911A
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TW
Taiwan
Prior art keywords
tool
signal
module
signal processing
frequency
Prior art date
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TW101106217A
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Chinese (zh)
Inventor
Yung-Cheng Wang
guo-hua Feng
Fu-Tun Chang
Chung-Ping Chang
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Optica Tech Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Optica Tech Co Ltd filed Critical Optica Tech Co Ltd
Priority to TW101106217A priority Critical patent/TW201334911A/en
Publication of TW201334911A publication Critical patent/TW201334911A/en

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Abstract

This invention is concerned with the measurement method and apparatus for the breakage detection of the cutter in the machine tool. The system includes a sensing module, a signal processing and a display module. The sensing module is mounted on a non-rotational part of the spindle of the machine tool. At the processing of a work piece, the signal processing module will receive the vibration signal and the voice frequency detected by the sensing module. The signal is treated by the signal processing module, and a threshold is set in the module in advance. When the amplitude of the vibration is within the threshold, the processing will be verified as normal. Otherwise when beyond the threshold of the vibration, the processing will be denoted as abnormal. Simultaneously we can do the double check by the sensing module. By this way, an automatic detecting system with the characteristics of the enhancement of the working efficiency and reliability the minimization of the idling time can be realized.

Description

Tool machine broken knife automatic detecting method and device thereof
The invention relates to an automatic detecting device, in particular to a method and a device for detecting an automatic detecting of a machine tool broken knife.
At present, when CNC machine tools are processed, they often face the optimal combination of tool selection and machining feed conditions. In the process of setting, it is often difficult to achieve the best machining results, plus various factors of the tool itself, for example : The diameter-to-deep ratio of the tool machining, the single-sided cutting caused by the re-grinding of the tool or the boring of the tool material, etc., it is easy to cause damage and breakage of the tool during the machining process. If the tool is not detected immediately after the tool is cut, the tool is immediately changed. Not only will the subsequent process not be carried out smoothly, but also the damage of the mold workpiece and the machine table will be caused.
Moreover, in the process of processing, chips are generated and a large amount of cutting fluid is sprayed, and it is difficult to manually observe whether the tool is broken from the monitoring window in an artificial manner, because the operator cannot immediately know the processing state in the process, so It usually causes the expansion and damage of the whole machining process. For example, the machining process of the micro-diameter tool (<0.5mm end mill) is taken as an example. Because the tool diameter is small, even if the new tool can not directly identify the tool normally or not. Moreover, in the processing process, a large amount of cooling water is punched on the processing contact surface. When the tool breaks and cannot contact the surface of the workpiece, it is usually necessary to wait until the entire machining process is completed, by examining the surface of the workpiece, to know the processing. In the process of tool breakage, there are improvements.
Therefore, the present inventors have in view of the current detection device capable of detecting the condition of the tool tool in real time, and thus cannot provide the prompt function of the instant knife breaking and the problem and the problem of assisting the user in judging the timing of the tool change. Experiments have finally developed a invention that improves existing defects.
In view of this, this patent designs a set of tool-cutting automatic detection system that can be mounted on the machine tool and has an instant tool-cracking function and a personnel re-confirmation device to assist the user in judging the timing of the tool change. Prompt and reconfirm, increase work efficiency and reduce idling after machine tool breakage.
The main object of the present invention is to provide a method and device for automatically detecting a broken tool of a machine tool, which can automatically and instantly detect a tool of a machine tool, thereby providing an instant prompt and personnel reconfirmation device, and adding Work efficiency and reduce the purpose of idling after the machine tool breaks.
In order to achieve the above object, the present invention provides a method for automatically detecting a tool-breaking tool, the operating process of which includes: providing an automatic detecting device: the detecting device is provided with a detecting module, a signal processing module, and a display module for detecting vibration and audio of the tool, the signal processing module being connected to the detection module and having a conversion program, and the display module and the signal processing module Connected and provided with a display and a noise receiver; the instrument is arranged: the module of the automatic detecting device is arranged on a fixed end of a machine tool spindle, and a workpiece to be processed is placed on the working table of the machine tool. The workpiece on the spindle is processed by the tool on the spindle; signal conversion: when the tool is processed for the workpiece to be processed, the detection module detects the vibration condition of each axis of the spindle and generates The audio is transmitted to the signal processing module, and the signal processing module performs signal processing and transmission; the standard value setting: the amplitude and frequency of the processing state are due to the type of the workpiece and the tool. Different changes, but the specific processing state must produce a specific frequency and audio, and the specific frequency and audio during processing must be determined by the structural analysis of the machine tool and the known speed, based on the resonant frequency and the rotational frequency. Setting a critical standard value and manually monitoring the detected audio; and comparing the signal value: when the frequency during processing is at a set critical standard value, it is regarded as a state in which the tool is normally processed, and A normal tool indication is displayed on the display of the display module. When the tool is broken, the frequency caused by the spindle rotation of the machine tool and the resonance of the machine will be different from the frequency during normal machining, so that the processing frequency will be lower than that. The critical standard value is regarded as a state of abnormal machining of the tool, and an indication of a tool abnormality is displayed on the display of the display module.
Further, in the operation step of providing an automatic detecting device, the detecting module is provided with a protective shell, a three-axis accelerometer, an amplifying circuit and a wireless noise detector, and the three-axis acceleration gauge The amplifying circuit is connected to the protective casing, and the wireless noise detector is disposed in the protective casing. The signal processing module is configured to receive the audio detected by the wireless noise detector. a wireless noise transmitter for receiving audio transmitted by the wireless noise transmitter.
Further, in the operating step of the apparatus erecting, the detecting module is disposed on the bearing housing of the spindle non-rotor.
Preferably, in the operation step of the signal conversion, when the detecting module detects the vibration condition of each axis of the spindle and the generated audio, the corresponding signal is amplified and the wireless noise is amplified by the amplifying circuit. After the detector detects the signal, it is transmitted to the signal processing module, and the signal processing module processes and transmits the signal.
Preferably, in the operation step of the signal conversion, the conversion program performs short-time Fourier transform on the vibration signal, and converts the amplitude-time relationship of the vibration signal into an amplitude-frequency relationship.
The present invention further provides an automatic detection device for a machine tool, which comprises a detection module, a signal processing module and a display module, wherein: the detection module is provided with a protective shell and a three-axis An acceleration gauge, an amplifying circuit and a wireless noise detector, the three-axis acceleration gauge is connected to the amplifying circuit and disposed in the protective casing, and the wireless noise detector is also disposed in the protective casing; The signal processing module is connected to the detection module and has a conversion program and a wireless noise transmitter; and the display module is connected to the signal processing module and is provided with a display and a noise receiver.
According to the above technical means, the automatic detecting method and device for the tool cutting machine of the present invention mainly detects the vibration of the machine tool and the tool processing and the generated audio through the detecting module, thereby knowing that the tool is in the What kind of vibration and audio data will be generated when the workpiece material is removed by normal processing, and transmitted to the signal processing module, and converted into a spectrogram that can be easily interpreted by short-time Fourier operation, so that the user can Select the best position to be monitored and set the optimal critical value of the machining vibration. Furthermore, you can set the upper and lower intervals of the critical value of the vibration to adjust the sensitivity of the abnormal signal and can be manually monitored. Further confirmation by the generated audio; when confirming that the signal is a normal cutting signal, it can be used to set the critical standard value during processing, so when the processing is repeated, we can set the critical standard The value is used to compare the value of the vibration signal while being processed. When the tool is damaged or broken, the tool cannot contact the workpiece normally. The normal processing is removed, so the original set vibration signal value cannot be generated. Therefore, the detected signal value will be different from the original set signal value, and the warning can be issued accordingly to effectively solve the current user. It is necessary to wait until the end of the cycle of the entire CNC machining program to know from the workpiece that the tool has been broken halfway or earlier in the entire process, and the damage of the machining tool can be detected immediately, thereby providing a The automatic detection method and device for the tool machine broken knife which can promptly prompt and re-confirm, increase the work efficiency and reduce the idling after the machine tool breaks.
In order to understand the technical features and practical effects of the present invention in detail, and in accordance with the contents of the specification, the preferred embodiments shown in the drawings (shown in FIGS. 1 to 3) are described in detail as follows:
The invention mainly discloses that when the tool is to be processed, the tool breaks the molecular structure of the workpiece and the tool contact surface during processing, and heat is generated due to stacking and squeezing of the molecular structure of the workpiece, and during the removal process, The contact surface between the tool and the material to be removed also generates vibration, and the tool state is discriminated by detecting the vibration of the tool, thereby providing a method and device for automatically detecting the tool cutting tool, wherein the machine tool is automatically broken. The detection method includes:
A. An automatic detection device is provided. The detection device is provided with a detection module 10, a signal processing module 20 and a display module 30. The detection module 10 is provided with a protective casing 11 and a The three-axis accelerometer 12, an amplifying circuit 13 and a wireless noise detector 14 are connected to the amplifying circuit 13 and are disposed in the protective casing 11, and the wireless noise detector The signal processing module 20 is connected to the detection module 10 and is provided with a conversion program 21 and a wireless noise transmitter 22, and the display module 30 is coupled to the signal. The processing module 20 is connected to the display and is provided with a display 31 and a noise receiver 32. Preferably, the noise receiver 32 can be a wireless earphone;
B. Instrument erection: As shown in FIG. 3, the detection module 10 of the automatic detection device is disposed on a fixed end of a machine tool spindle 50. Preferably, the detection module 10 is disposed on the spindle 50. On the bearing housing 51 of the rotor, a workpiece 60 to be processed is placed on the table 52 of the machine tool, and the workpiece 53 on the spindle 50 is processed for the workpiece 60 to be processed;
C. Signal conversion: When the tool 53 is processed for the workpiece 60 to be processed, the detection module 10 detects the vibration (acceleration) of the axial direction of the spindle 50 and the generated audio, and the phase The corresponding signal is amplified by the amplifying circuit 13 and detected by the wireless noise detector 14 and transmitted to the signal processing module 20, and the signal processing module 20 processes and transmits the signal. Preferably, The conversion program 21 performs a Short-Time Fourier Transform (STFT) on the vibration signal, wherein the formula of the short-time Fourier transform is
After the short-time Fourier transform, the amplitude-time relationship (time domain) of the vibration signal can be converted into an amplitude-frequency relationship (frequency domain), wherein the original signal before the conversion as shown in FIG. 4 is composed of three types. Signals with a frequency of 100, 200, and 300 Hz (Hz) are superimposed. The original signal is very cluttered and difficult to analyze. However, after a short-time Fourier transform, it is clear that the signal is mainly caused by The waveforms of the three frequencies are superimposed. Further, when the tool 53 is processed for the workpiece 60 to be processed, the wireless noise detector 14 is simultaneously detected by the wireless noise detector 14 to generate audio through the wireless noise. The transmitter 22 transmits the audio detected by the wireless noise detector 14 to the noise receiver 32 for monitoring by manual means;
D. Standard value setting: The amplitude and frequency of the machining state will change differently due to the shape of the workpiece 60 and the tool 53. However, the specific machining state must generate a specific frequency, and the specific frequency during machining must pass through the tool. The structural analysis of the machine is determined by the known rotational speed, wherein as shown in Fig. 5, the resonance frequency (A) of the machine tool is about 300 Hz, and the rotational speed of the spindle 50 is about 20,000 RPM (333 Hz). For (B), a critical standard value (C) is preset according to the resonant frequency and the rotational frequency, wherein the threshold value standard (C) is set to N% of the maximum amplitude of the processing state, for example, a critical standard value (C) is set. For the maximum amplitude of 70%, assuming a maximum amplitude of 100 μm, the critical standard value (C) is 70 μm, but the percentage of this setting depends on the condition of the machine;
E. Alignment signal value: as shown in FIG. 5, when the frequency during processing is located on the critical standard value (C), it is regarded as a normal processing state of the tool, and is displayed on the display 31 of the display module 30. The indication of a normal tool is displayed. Conversely, when the cutter 53 is broken, the frequency caused by the rotation of the machine tool spindle 50 and the resonance of the machine will be greatly attenuated, so that the machining frequency (A), (B) will be lower than the critical value. The standard value (C) is regarded as a state in which the tool is abnormally machined, and an indication of a tool abnormality is displayed on the display 31 of the display module 30.
According to the above technical means, the automatic detecting method and device for the tool cutting machine of the present invention mainly detects the vibration of the machine tool and the tool 53 during processing and the generated audio through the detecting module 10, thereby being known What type of vibration and audio data is generated by the cutter 53 during normal machining to remove the workpiece 60 material, and transmitted to the signal processing module 20, and converted into a spectrum pattern that can be easily interpreted by short-time Fourier operation. , allowing the user to select the best position to be monitored and set the optimal machining vibration critical standard value (C), or set the upper and lower intervals of the vibration critical standard value (C) to adjust the abnormal signal. Sensitivity, and can be further confirmed by manual monitoring through the generated audio; when confirming that the signal is a normal cutting signal, it can be used to set the critical standard value (C) during processing, so When repeating this machining process, we can use the critical standard value (C) to compare the vibration signal values (A), (B) during machining, when the tool 53 is damaged or broken, due to the knife 53 The workpiece 60 cannot be normally touched for normal processing removal. Therefore, the originally set vibration signal value cannot be generated. Therefore, the detected signal value will be different from the originally set signal value. A warning is issued to effectively solve the problem that the current user has to wait until the end of the cycle of the entire CNC machining program to know from the workpiece that the tool has been broken in half or earlier when the entire process is processed. The damage condition of the tool, and then provides an automatic detection method and device for the tool machine broken knife which can promptly prompt and reconfirm, increase the work efficiency and reduce the idling after the machine tool breaks.
The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any one of ordinary skill in the art can use the present invention without departing from the scope of the present invention. Equivalent embodiments of the invention may be made without departing from the technical scope of the present invention.
10. . . Detection module
11. . . Protective case
12. . . Triaxial acceleration gauge
13. . . amplifying circuit
14. . . Wireless noise detector
20. . . Signal processing module
twenty one. . . Conversion program
twenty two. . . Wireless noise transmitter
30. . . Display module
31. . . monitor
32. . . Noise receiver
50. . . Spindle
51. . . Bearing housing
52. . . Workbench
53. . . Tool
60. . . Workpiece
1 is a block diagram showing the operation of the automatic detecting method of the tool cutting machine of the present invention.
2 is a block diagram of the automatic detecting device for the tool cutting machine of the present invention.
FIG. 3 is a schematic diagram of the detecting operation of the automatic detecting device for the tool cutting machine of the present invention.
Figure 4 is a schematic illustration of the amplitude-time relationship of the present invention converted into amplitude versus frequency.
Fig. 5 is a graph showing the relationship between amplitude and frequency for determining whether a tool is broken by the present invention.

Claims (9)

  1. An automatic detection method for a tool-breaking knife includes an automatic detection device: a detection module, a signal processing module and a display module, the detection module The vibration processing and the audio of the tool are detected. The signal processing module is connected to the detection module and has a conversion program. The display module is connected to the signal processing module and is provided with a display and a noise receiving. The erection of the device is set on the fixed end of a machine tool spindle, and a workpiece to be processed is placed on the work table of the machine tool, and the tool on the spindle is processed for the tool The workpiece is processed; the signal conversion: when the tool is processed for the workpiece to be processed, the detection module detects the vibration condition of the shaft and the generated audio, and transmits the generated audio to the signal processing module. In the group, the signal processing module performs signal processing and transmission; the standard value setting: the amplitude and frequency of the machining state will change differently due to the shape of the workpiece and the tool, but the overall machining state A certain frequency and audio must be generated, and the specific frequency and audio during processing must be determined by the structural analysis of the machine tool and the known rotational speed. A critical standard value is preset according to the resonant frequency and the rotational frequency, and manually Monitoring the detected audio; and comparing the signal value: when the processing frequency is at the set critical standard value, it is regarded as a normal processing state of the tool, and is displayed on the display of the display module A normal tool indication, when the tool breaks, the frequency caused by the spindle rotation of the machine tool and the resonance of the machine will be different from the frequency of normal machining, so that the machining frequency will be lower than the critical standard value, which is regarded as a tool abnormality. The state of the process and an indication of a tool abnormality is displayed on the display of the display module.
  2. The method for automatically detecting a tool-breaking tool according to claim 1, wherein in the operating step of providing an automatic detecting device, the detecting module is provided with a protective shell, a three-axis accelerometer, and an amplifying circuit. And a wireless noise detector, the three-axis acceleration gauge is connected to the amplifying circuit and is disposed in the protective casing, the wireless noise detector is also disposed in the protective casing, and the signal processing module is provided There is a wireless noise transmitter for receiving audio detected by the wireless noise detector, and the noise receiver is for receiving audio transmitted by the wireless noise transmitter.
  3. The method and device for automatically detecting a tool-breaking tool according to claim 2, wherein in the operating step of the instrument erecting, the detecting module is disposed on a bearing housing of the spindle non-rotor.
  4. The method and device for automatically detecting a tool-breaking tool according to claim 2 or 3, wherein in the operation step of the signal conversion, when the detecting module detects the vibration condition of each axis of the spindle and generates After the audio is amplified, the corresponding signal is amplified by the amplifying circuit and detected by the wireless noise detector, and then transmitted to the signal processing module, where the signal processing module processes and transmits the signal.
  5. The method and device for automatically detecting a machine tool broken knife according to claim 4, wherein in the operation step of the signal conversion, the conversion program performs short-time Fourier transform on the vibration signal, and the amplitude-time relationship of the vibration signal is obtained. Converted into an amplitude versus frequency relationship.
  6. The method and device for automatically detecting a machine tool broken knife according to claim 1, wherein in the operation step of the signal conversion, the conversion program performs short-time Fourier transform on the vibration signal, and the amplitude-time relationship of the vibration signal is obtained. Converted into an amplitude versus frequency relationship.
  7. The method and device for automatically detecting a machine tool broken knife according to claim 2, wherein in the operation step of the signal conversion, the conversion program performs short-time Fourier transform on the vibration signal, and the amplitude-time relationship of the vibration signal is obtained. Converted into an amplitude versus frequency relationship.
  8. The method and device for automatically detecting a machine tool broken knife according to claim 3, wherein in the operation step of the signal conversion, the conversion program performs short-time Fourier transform on the vibration signal, and the amplitude-time relationship of the vibration signal is obtained. Converted into an amplitude versus frequency relationship.
  9. The utility model relates to an automatic detection device for a tool-breaking knife, which comprises a detection module, a signal processing module and a display module, wherein: the detection module is provided with a protective shell, a three-axis acceleration gauge, and a An amplifying circuit and a wireless noise detector, the three-axis accelerometer is connected to the amplifying circuit and disposed in the protective casing, and the wireless noise detector is also disposed in the protective casing; the signal processing module The system is connected to the detection module and has a conversion program and a wireless noise transmitter; and the display module is connected to the signal processing module and is provided with a display and a noise receiver.
TW101106217A 2012-02-24 2012-02-24 Method and apparatus for detecting the break of the cutter of the machine tool automatically TW201334911A (en)

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TW101106217A TW201334911A (en) 2012-02-24 2012-02-24 Method and apparatus for detecting the break of the cutter of the machine tool automatically

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TW201334911A true TW201334911A (en) 2013-09-01

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105710719A (en) * 2016-01-15 2016-06-29 深圳吉兰丁智能科技有限公司 Idle running eliminating method and system and machine tool
TWI593502B (en) * 2015-11-13 2017-08-01 財團法人工業技術研究院 Cutting tool verifying system and cutting tool verifying method thereof
TWI638251B (en) * 2017-01-20 2018-10-11 國立中興大學 Modal detection system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI593502B (en) * 2015-11-13 2017-08-01 財團法人工業技術研究院 Cutting tool verifying system and cutting tool verifying method thereof
CN105710719A (en) * 2016-01-15 2016-06-29 深圳吉兰丁智能科技有限公司 Idle running eliminating method and system and machine tool
CN105710719B (en) * 2016-01-15 2018-07-13 深圳吉兰丁智能科技有限公司 The idle running that disappears method and system and lathe
TWI638251B (en) * 2017-01-20 2018-10-11 國立中興大學 Modal detection system

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