1. ADAPTIVE CONTROL MACHINING PRESENTED BY RACHIN.S.R 02107037

2. INTRODUCTION ADAPTIVE CONTROL MACHINING(AC) ORGINATED OUT OF RESEARCH IN EARLY 1960’S SPONSERED BY THE US AIRFORCE. ADAPTIVE CONTROL MACHINING(AC) ORGINATED OUT OF RESEARCH IN EARLY 1960’S SPONSERED BY THE US AIRFORCE. AC USES MICROPROCESSER BASED CONTROLS AND IS TYPICALLY INTEGRATED WITH A EXISTING CNC SYSTEM. AC USES MICROPROCESSER BASED CONTROLS AND IS TYPICALLY INTEGRATED WITH A EXISTING CNC SYSTEM.

3. IN AC MACHINING THERE IS IMPROVEMENT IN THE PRODUCTION RATE AND REDUCTION IN MACHINING COSTS. IN AC MACHINING THERE IS IMPROVEMENT IN THE PRODUCTION RATE AND REDUCTION IN MACHINING COSTS. THIS OCCURS AS A RESULT OF CALCULATING AND SETTING OF OPTIMAL PARAMETERS DURING MACHINING. THIS OCCURS AS A RESULT OF CALCULATING AND SETTING OF OPTIMAL PARAMETERS DURING MACHINING.

4. ADAPTIVE CONTROL AC POSSESSES ATTRIBUTES OF BOTH FEED- BACK CONTROL AND OPTIMAL CONTROL AC POSSESSES ATTRIBUTES OF BOTH FEED- BACK CONTROL AND OPTIMAL CONTROL FEATURE THAT DISTINGUISHES AC CONTROL FROM OTHER TWO TYPES IS THAT AN AC SYSTEM IS DESIGNED TO WORK IN A TIME VARYING ENVIORNMENT FEATURE THAT DISTINGUISHES AC CONTROL FROM OTHER TWO TYPES IS THAT AN AC SYSTEM IS DESIGNED TO WORK IN A TIME VARYING ENVIORNMENT

5. AN AC SYSTEM IS DESIGNED TO OPERATE FOR THE CHANGING ENVIORNMENT BY MONITORING ITS PERFOMANCE AND ACCORDINGLY SOME ASPECTS OF ITS CONTROL MECHANISM TO ACHIEVE OPTIMAL OR NEAR OPTIMAL PERFOMANCE AN AC SYSTEM IS DESIGNED TO OPERATE FOR THE CHANGING ENVIORNMENT BY MONITORING ITS PERFOMANCE AND ACCORDINGLY SOME ASPECTS OF ITS CONTROL MECHANISM TO ACHIEVE OPTIMAL OR NEAR OPTIMAL PERFOMANCE AN AC EVALUATES ITS PERFOMANCE WITHIN THE ENVIORNMENT AND MAKES NECESSARY CHANGES IN ITS CONTROL CHARACTERISTICS TO IMPROVE OR IF POSSIBLE TO OPTIMIZE ITS PERFOMANCE AN AC EVALUATES ITS PERFOMANCE WITHIN THE ENVIORNMENT AND MAKES NECESSARY CHANGES IN ITS CONTROL CHARACTERISTICS TO IMPROVE OR IF POSSIBLE TO OPTIMIZE ITS PERFOMANCE

6. FUNCTIONS OF AC IDENTIFICATION FUNCTION IDENTIFICATION FUNCTION DECISION FUNCTION DECISION FUNCTION MODIFICATION FUNCTION MODIFICATION FUNCTION

8. ADAPTIVE CONTROL SYSTEM AC OF METAL WORKING PROCESS IS A LOGICAL EXTENSION OF THE NUMERICAL CONTROL AND COMPUTER CONTROL AC OF METAL WORKING PROCESS IS A LOGICAL EXTENSION OF THE NUMERICAL CONTROL AND COMPUTER CONTROL IN NC PROCESS THE CUTTING SPEED AND FEEDS ARE PRESCRIBED BY THE PART PROGRAMMERS IN NC PROCESS THE CUTTING SPEED AND FEEDS ARE PRESCRIBED BY THE PART PROGRAMMERS

10. IN PRACTICE THE AC SYSTEMS OF MACHINE TOOLS CAN BE CLASSIFIED INTO TWO TYPES IN PRACTICE THE AC SYSTEMS OF MACHINE TOOLS CAN BE CLASSIFIED INTO TWO TYPES AC WITH OPTIMISATION(ACO). AC WITH OPTIMISATION(ACO). AC WITH CONSTRAINTS(ACC). AC WITH CONSTRAINTS(ACC).

11. DEFINITION THE TERM AC DENOTES A CONTROL SYSTEM THAT MEASURES CERTAIN O/P VARIABLES AND USES THESE TO CONTROL SPEED AND/OR FEED THE TERM AC DENOTES A CONTROL SYSTEM THAT MEASURES CERTAIN O/P VARIABLES AND USES THESE TO CONTROL SPEED AND/OR FEED THE TYPICAL MEASURES OF PERFOMANCE IN MACHINING HAVE BEEN METAL REMOVEL RATE AND COST PER VOLUME OF METAL REMOVEL THE TYPICAL MEASURES OF PERFOMANCE IN MACHINING HAVE BEEN METAL REMOVEL RATE AND COST PER VOLUME OF METAL REMOVEL

12. WHERE TO USE AC ONE OF THE PRINCIPLE REASONS FOR USING NC IS THAT IT REDUCES THE NONPRODUCTIVE TIME IN A MACHINING OPERATION. ONE OF THE PRINCIPLE REASONS FOR USING NC IS THAT IT REDUCES THE NONPRODUCTIVE TIME IN A MACHINING OPERATION. AC DETERMIES THE PROPER SPEEDS AND FEEDS DURING MACHINING AS A FUNCTION OF VARIABLES IN SUCH FACTORS AS WORK MATERIAL HARDNESS,WIDTH OR DEPTH OF CUT,AIR GAPS IN THE PART GEOMETRY AND SO ON AC DETERMIES THE PROPER SPEEDS AND FEEDS DURING MACHINING AS A FUNCTION OF VARIABLES IN SUCH FACTORS AS WORK MATERIAL HARDNESS,WIDTH OR DEPTH OF CUT,AIR GAPS IN THE PART GEOMETRY AND SO ON

13. THE FOLLOWING CHARACTERISTICS CAN BE USED TO IDENTIFY SITUATIONS WHERE AC CAN BE BENEFICIALLY APPLIED THE FOLLOWING CHARACTERISTICS CAN BE USED TO IDENTIFY SITUATIONS WHERE AC CAN BE BENEFICIALLY APPLIED 1. IN-PROCESS TIME CONSUMES A SIGNIFICANT PORTION OF THE MACHINING CYCLE TIME 2. THERE ARE SIGNIFICANT SOURCES OF VARIABILITY IN JOB FOR WHICH AC CAN COMPENSATE 3. COST OF OPERATING MACHINING TOOL IS HIGH 4. THE TYPICAL JOB INVOLVES STEEL & HIGH STRENGTH ALLOYS

14. SOURCES OF VARIABILITY 1. VARIABLE GEOMETRY OF CUT 2. VARIABLE WORKPIECE HARDNESS & VARIABLE MACHINABILITY 3. VARIABLE WORKPIECE RIGIDITY 4. TOOL WEAR 5. AIR GAPS DURING CUTTING

16. BENEFITS OF AC INCREASED PRODUCTION RATES INCREASED PRODUCTION RATES INCREASED TOOL LIFE INCREASED TOOL LIFE GREATER PART PROTECTION GREATER PART PROTECTION LESS OPERATOR NTERVENTION LESS OPERATOR NTERVENTION EASIER PART PROGRAMMING EASIER PART PROGRAMMING

17. CONCLUSION FOR A MACHINING OPERATION AC IS THE BEST METHOD FOR CONTROLLING THE PROCESS FOR A MACHINING OPERATION AC IS THE BEST METHOD FOR CONTROLLING THE PROCESS IT HAS BEEN ESTABLISHED THAT IT WAS POSSIBLE TO INCREASE THE METAL REMOVING RATE BY 35% TO 45% BY USING AC TECHNIQUES IT HAS BEEN ESTABLISHED THAT IT WAS POSSIBLE TO INCREASE THE METAL REMOVING RATE BY 35% TO 45% BY USING AC TECHNIQUES

18. THANK YOU