JPS5639852A - Abnormality detector for cutting tool of machine tool - Google Patents

Abnormality detector for cutting tool of machine tool

Info

Publication number
JPS5639852A
JPS5639852A JP11177279A JP11177279A JPS5639852A JP S5639852 A JPS5639852 A JP S5639852A JP 11177279 A JP11177279 A JP 11177279A JP 11177279 A JP11177279 A JP 11177279A JP S5639852 A JPS5639852 A JP S5639852A
Authority
JP
Japan
Prior art keywords
signal
cutting
cutting tool
pass filter
coupled
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
JP11177279A
Other languages
Japanese (ja)
Other versions
JPS6161939B2 (en
Inventor
Koji Nakazawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi 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.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP11177279A priority Critical patent/JPS5639852A/en
Publication of JPS5639852A publication Critical patent/JPS5639852A/en
Publication of JPS6161939B2 publication Critical patent/JPS6161939B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/09—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool
    • B23Q17/0904—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool before or after machining
    • B23Q17/0919—Arrangements for measuring or adjusting cutting-tool geometry in presetting devices
    • B23Q17/0947—Monitoring devices for measuring cutting angles

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Sensing Apparatuses (AREA)

Abstract

PURPOSE:To detect the abnormality of cutting with high sensitivity, by separating a signal of thermoelectromotive force and a signal of electrical current across a cutting tool and a workpiece. CONSTITUTION:Both ends of a detection resistor R0 coupled in series between the table 2 of a machine tool and an AC power source E0 are connected to a differential amplifier 16. A low-pass filter 17 is coupled to the differential amplifier 16. Another low-pass filter 20 is coupled to the amplifier 16 through a band-pass filter 18 and a rectifier circuit 19. Voltage is applied across the table 2 and an electric contact 7 provided on the central part of the end of a main shaft 5. The magnitude of a circuit current is measured by the detection resistor R0. An AC voltage is applied across a cutting tool 4 and a workpiece 3. A signal of electrical current and a signal of thermoelectromotive force are separated from a signal detected from the detection resistor R0. It is judged from both former separated signals whether cutting is normal abnormal (wear, damage or the like of the cutting tool). Since the signal of electrical current and the signal of thermoelectromotive force show characteristic differences as to the normality and abnormality of the cutting, the purpose is attained.
JP11177279A 1979-09-03 1979-09-03 Abnormality detector for cutting tool of machine tool Granted JPS5639852A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11177279A JPS5639852A (en) 1979-09-03 1979-09-03 Abnormality detector for cutting tool of machine tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11177279A JPS5639852A (en) 1979-09-03 1979-09-03 Abnormality detector for cutting tool of machine tool

Publications (2)

Publication Number Publication Date
JPS5639852A true JPS5639852A (en) 1981-04-15
JPS6161939B2 JPS6161939B2 (en) 1986-12-27

Family

ID=14569771

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11177279A Granted JPS5639852A (en) 1979-09-03 1979-09-03 Abnormality detector for cutting tool of machine tool

Country Status (1)

Country Link
JP (1) JPS5639852A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060011799A (en) * 2005-09-26 2006-02-03 주식회사 마이크로텍 Method for detecting drill breakage and device for the same
WO2014072554A1 (en) * 2012-11-06 2014-05-15 Consejo Superior De Investigaciones Científicas (Csic) Method and system for monitoring a machining operation in real time
WO2022049719A1 (en) * 2020-09-04 2022-03-10 国立大学法人東海国立大学機構 Cutting device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5252282A (en) * 1975-10-24 1977-04-26 Toshiba Corp Fracture detecting device for cutting tool

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5252282A (en) * 1975-10-24 1977-04-26 Toshiba Corp Fracture detecting device for cutting tool

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060011799A (en) * 2005-09-26 2006-02-03 주식회사 마이크로텍 Method for detecting drill breakage and device for the same
WO2014072554A1 (en) * 2012-11-06 2014-05-15 Consejo Superior De Investigaciones Científicas (Csic) Method and system for monitoring a machining operation in real time
WO2022049719A1 (en) * 2020-09-04 2022-03-10 国立大学法人東海国立大学機構 Cutting device

Also Published As

Publication number Publication date
JPS6161939B2 (en) 1986-12-27

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