developing cnc program for the manufacturing of guide
TRANSCRIPT
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DEVELOPING CNC PROGRAM FOR THE MANUFACTURING OF GUIDE BLADE GOOVES
ON STEAM TURBINE CASINGBy
P.Kranthi KumarR.Aditya
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Contents Introduction to steam turbine Steam Turbine Elements Introduction to CNC Computer Numerical Control Introduction to CNC programming CNC Programming
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Introduction To Steam Turbine A Steam turbine can be defined as a form of heat engine in which the energy
of the steam is transformed into kinetic energy by the means of expansion through nozzles and kinetic energy of the resulting jet is in turn converted into force during work on rings of blading mounted on a rotating part.
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Fundamental Parts of Steam
Turbine
FrameNozzleStatorRotor
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Steam Turbine Elements Turbine casing and guide blade carrier:
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Inner Casing:
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Turbine Rotor and Blading
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Introduction to CNC ProgrammingNumerical
control
Type of machine
Storage Media
Programming
methods
Type of control
Point –to –Point NC
Continuous NC
Open Loop
Closed Loop
Incremental
Absolute
Magnetic Disc
Punched Paper
Magnetic Tape
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Computer Numerical Control
Tape reader for
initial program
entry
Minicomputer or microcomputer
(software functions and NC part program
storage)
Computer
hardware
interface and servo
system
Motion Feedback
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Introduction To CNC ProgrammingPart
programming structure
Character
Digit Letter Symbol
Word BlockProgra
m
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FUNCTIONAL CODES: There are two main codes used to perform the operation on the machine.
CODES
M-CODESG-
CODES
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CNC PROGRAMMain program HP side.Subroutine Programs.
1) Diameter Roughing
2) Groove Roughing
3) Calculation Subroutine
4) Groove Width Roughing / Depth Finishing
5) Diameter Finishing
6) Groove Width Finishing / 0.3 Recess
7) Step Diameter Finishing
8) Top Suspension
9) Bottom Suspension
10) Packing Groove
11) Chamfering Upper Lower
12) Fin Grooves
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GROOVE DIAGRAM
AF LHT
1X 45
BF BHLN BHMN
LHL
LHM
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MAIN PROGRAM(I.P SIDE)
G00 G90 X850 D1; Z = 2; R10 = 9; (Diameter Roughing)
=10; (Groove Roughing) =11; (Groove width Roughing/ depth finishing) =12; (Diameter finishing) =13; (Groove width Roughing/0.3 recess) =14; (Step Diameter Finishing) =15; (Top suspension)
=16; (Bottom suspension) =17; (Packing Groove) =18; (Upper chamfering) =19; (lower chamfering) = 20; (Fin Grooves)
NO10 (POS 20) R1=1357 R2=1318 R3=143 R4=137.7 R5=18 R6=10
R7=21 R8=14 R9=25.8 R11=25 R12=80.9 R13=17
L=R10;
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L10 .Groove Roughing (Using grooveing tool)
D15
D25
R1
R20
R4
R22
L9.Diameter Roughing (Using boring tool) D1 R3 R1 R2
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L11 Groove Width Roughing / Depth Finishing (Using grooving tool)
R1 R20 R4 R2 R22
L12 Diameter Finishing (Using grooving tool) R3 R1 R2
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L14 Step dia finishing (Using grooving tool)
R24 R1
R3 R23
L13 Top suspension (Using top suspension tool)
D10 D20
R20
R29
r3
R27 R22
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L17 Packing groove (Using radius tool of 3mm diameter) D21 R1 R22 R35 R4 R2
L20 Fin grooves (Using a special grooving tool of 1.5 mm width) D5 R1 R12 R13
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L100. Calculation Subroutine
R20 = R4-R5; R21 = 2*R7; R22 = R1+6+R21; R23 = R3-0.3; R24 = R23-R11; R25 = R7-R6; R26 = 2*R25; R27 = (R9-R5)/2; R29 = R20-R28; R30 = R4+R28; R31 = 2*R8; R32 = 2*R6; R33 = R31 + R32 + 6; R34 = R1 + R33; R35 = R5/2;
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THANK YOU