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GB1388769A - Numerical control system for centre lathes - Google Patents

Numerical control system for centre lathes

Info

Publication number
GB1388769A
GB1388769A GB2325872A GB2325872A GB1388769A GB 1388769 A GB1388769 A GB 1388769A GB 2325872 A GB2325872 A GB 2325872A GB 2325872 A GB2325872 A GB 2325872A GB 1388769 A GB1388769 A GB 1388769A
Authority
GB
United Kingdom
Prior art keywords
signal
cutting rate
mandrel
lathe
servomotor
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.)
Expired
Application number
GB2325872A
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.)
Olivetti SpA
Original Assignee
Olivetti SpA
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 Olivetti SpA filed Critical Olivetti SpA
Publication of GB1388769A publication Critical patent/GB1388769A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/182—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by the machine tool function, e.g. thread cutting, cam making, tool direction control
    • 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
    • G05B2219/41—Servomotor, servo controller till figures
    • G05B2219/41358—Transmission, variable gear ratio
    • 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
    • G05B2219/43—Speed, acceleration, deceleration control ADC
    • G05B2219/43141—Surface, path, tangential speed
    • 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
    • G05B2219/43—Speed, acceleration, deceleration control ADC
    • G05B2219/43158—Feedrate override
    • 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
    • G05B2219/45—Nc applications
    • G05B2219/45136—Turning, lathe
    • 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
    • G05B2219/50—Machine tool, machine tool null till machine tool work handling
    • G05B2219/50008—Multiple, multi tool head, parallel machining
    • 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
    • G05B2219/50—Machine tool, machine tool null till machine tool work handling
    • G05B2219/50289—Tool offset general
    • 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
    • G05B2219/50—Machine tool, machine tool null till machine tool work handling
    • G05B2219/50291—Multi-tool, several tools
    • 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
    • G05B2219/50—Machine tool, machine tool null till machine tool work handling
    • G05B2219/50315—Selfcorrecting by measurement during machining

Landscapes

  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Numerical Control (AREA)
  • Automatic Control Of Machine Tools (AREA)
  • Turning (AREA)

Abstract

1388769 Numerical control of machine tools ING C OLIVETTI & C SpA 17 May 1972 [18 May 1971] 23258/72 Heading G3N In a numerical control system for a lathe, discrete signals representing the transverse position of the lathe tool are used to produce a continuous transverse position signal. The ratio between a desired cutting rate signal and the continuous transverse position signal is calculated and used to control a servomotor which regulates the speed of rotation of the lathe mandrel. As shown, a punched tape reader 26 reads discrete positional data X 2 , Z 2 , prescribed tool feedrate F in mm. per revolution, prescribed cutting rate per unit time S, and offsets P and D representing X and Z divergences from a standard tool. The positional data are passed to an interpolator 96 of the type described in Specification 1154761 together with the feedrate signal F, converted into a mm. per unit time signal by multiplication by the angular speed of the mandrel supplied by a sensor 92 through a frequency divider 91, using a clock controlled accumulator 88. The resulting continuous position signals X' n , Z' n are passed through D-to-A converters 102, 104 to lathe slide servos 110, 112. The X position signal X' n , after allowing for the offset P, is fed to a flip-flop register 122 to convert it to parallel digital form for use in a dividerconverter circuit 126. Other inputs in similar form are derived from the cutting rate data S and the gear ratio G between a servomotor and the mandrel. The circuit 126 includes variable gain operational amplifiers, Fig. 3 (not shown) to form a signal N representing the ratio between the cutting rate S and the X position signal allowing for the selected gear ratio G. The signal N is fed to the mandrel servomotor. Manual adjustments 72, 74, 132 are provided for the offsets P, D and cutting rate S, respectively. The frequency divider 91 may also be adjusted.
GB2325872A 1971-05-18 1972-05-17 Numerical control system for centre lathes Expired GB1388769A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT6865071 1971-05-18

Publications (1)

Publication Number Publication Date
GB1388769A true GB1388769A (en) 1975-03-26

Family

ID=11310156

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2325872A Expired GB1388769A (en) 1971-05-18 1972-05-17 Numerical control system for centre lathes

Country Status (3)

Country Link
JP (1) JPS572460B1 (en)
DE (1) DE2224918C2 (en)
GB (1) GB1388769A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4646596A (en) * 1980-07-12 1987-03-03 Edwards Walter C Machine tools

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4688973A (en) * 1985-01-31 1987-08-25 Mcdonnell Douglas Corporation Automated machine tool

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211896A (en) * 1962-05-14 1965-10-12 Gen Electric Automatic control apparatus
DE1563766C3 (en) * 1966-10-20 1974-03-21 Siemens Ag, 1000 Berlin U. 8000 Muenchen Arrangement for cutting threads in a numerically controlled machine tool
JPS5341605B2 (en) * 1972-07-21 1978-11-06

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4646596A (en) * 1980-07-12 1987-03-03 Edwards Walter C Machine tools

Also Published As

Publication number Publication date
DE2224918C2 (en) 1982-12-23
JPS572460B1 (en) 1982-01-16
DE2224918A1 (en) 1972-12-07

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee