JPS57144647A - Feed speed control unit for cutting machine - Google Patents

Feed speed control unit for cutting machine

Info

Publication number
JPS57144647A
JPS57144647A JP2932681A JP2932681A JPS57144647A JP S57144647 A JPS57144647 A JP S57144647A JP 2932681 A JP2932681 A JP 2932681A JP 2932681 A JP2932681 A JP 2932681A JP S57144647 A JPS57144647 A JP S57144647A
Authority
JP
Japan
Prior art keywords
signal
feed speed
failure
load
value
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.)
Pending
Application number
JP2932681A
Other languages
Japanese (ja)
Inventor
Hajime Inaba
Yukio Ono
Ryuichi Hara
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.)
Fanuc Corp
Original Assignee
Fanuc Corp
Fujitsu Fanuc 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 Fanuc Corp, Fujitsu Fanuc Ltd filed Critical Fanuc Corp
Priority to JP2932681A priority Critical patent/JPS57144647A/en
Publication of JPS57144647A publication Critical patent/JPS57144647A/en
Pending 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
    • B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
    • B23Q15/007—Automatic control or regulation of feed movement, cutting velocity or position of tool or work while the tool acts upon the workpiece
    • B23Q15/12—Adaptive control, i.e. adjusting itself to have a performance which is optimum according to a preassigned criterion
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/37—Measurements
    • G05B2219/37536—Rate of change, derivative

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Control Of Machine Tools (AREA)

Abstract

PURPOSE:To make it possible to detect cutting failure in any early stage by comparing the output of threshold value of load change rate setting member with the output of load change rate detecting member and hence judging whether a large load fluctuation is caused either by the failure of tool or the failure of feed speed control. CONSTITUTION:When a load signal S1 is (markedly) deviated from a target load signal S2 at time t2, a difference signal S3 is deviated from an allowable range R. A feed speed setting circuit 24 transmits an override signal S4 to a cutting tool 1 as a directive to reduce the feed speed and also outputs a drive signal S4' to a failure detecting member 3. If the load signal S1 fails to fall quickly even when the feed speed is reduced, the value of a load change rate signal S5 will exceed a threshold value S6' thereby allowing a comparison circuit 33 to transmitt a failure detection signal S7. When load fluctuation are caused by feed speed control, the value of the S5 is smaller than the value of S6' and hence the failure detection signal S7 is not transmitted. With this construction, the failure of tool can be detected.
JP2932681A 1981-03-03 1981-03-03 Feed speed control unit for cutting machine Pending JPS57144647A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2932681A JPS57144647A (en) 1981-03-03 1981-03-03 Feed speed control unit for cutting machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2932681A JPS57144647A (en) 1981-03-03 1981-03-03 Feed speed control unit for cutting machine

Publications (1)

Publication Number Publication Date
JPS57144647A true JPS57144647A (en) 1982-09-07

Family

ID=12273100

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2932681A Pending JPS57144647A (en) 1981-03-03 1981-03-03 Feed speed control unit for cutting machine

Country Status (1)

Country Link
JP (1) JPS57144647A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019030954A (en) * 2017-08-07 2019-02-28 Dmg森精機株式会社 Machine tool and method for calculating degree of abrasion of tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019030954A (en) * 2017-08-07 2019-02-28 Dmg森精機株式会社 Machine tool and method for calculating degree of abrasion of tool

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