4- 1 6/13/2014 process engineering basics of process planning for computer implementation ie550 --...
TRANSCRIPT
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Process EngineeringBasics of Process Planning
for computer implementation
IE550 -- Manufacturing Systems
Fall 2008
Dr. R. A. Wysk
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Chapter 6 -- Process Engineering
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The Engineering Process
Stock Material Processes Finished part
Design specifications
Process planningProcesscapability
Inspection
Need to understand the process capabilities.
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PROCESS CAPABILITIES
Process: certain way an operation is carried out, e.g. turning, drilling, milling.
Tool: physical object which is used to carrying out a process, e.g. twist drill, spade drill, gun drill.
Machine tool: machine on which process is carried out, e.g. lathe, drill press, milling machine, machining center.
Process capability: The geometry and tolerance a manufacturing processcan produce, and its limitations, . i.e. shape and size, dimensional and geometric tolerances, material removal rate, relative cost, other cutting constraints.
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LEVELS OF PROCESS CAPABILITIES
Universal level:
Handbook and textbook level data. Aggregate characterization of what can be expected. General measures of the process capability such as shape and size. What the process can accomplish in an average shop on a typical machine tool.
Shop level:
Specific to a particular manufacturing system. What is the best attainable capability in one specific shop, e.g. the turning capability of the student machine shop is far worse than that in the shop of a precision spindle manufacturer.
Machine level:
Specific to a machine. Machines in the same shop has very different capability. A table top lathe can machine a small part, yet a large slant bed lathe may be able to handle a 20"x 10' part.
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PROCESS KNOWLEDGE COLLECTIONFew scientific data available or published.
Most process knowledge are gained during actual manufacturing practice.
Practical manufacturing knowledge is still an art instead of a science.
Certain information can be found in the textbooks, handbooks, machining data handbook, etc.
Tolerance capability may be obtained from control charts, inspection reports, and on-line sensor data.
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EXPERIENCE-BASED PLANNING
Relay on one's experience. Most frequently this is the way industry operates.
Problems:
a. Experience requires a significant period of time to accumulate.
b. Experience represents only approximate, not exact knowledge.
c. Experience is not directly applicable to new processes or new systems.
Need to automate.
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MACHINIST HANDBOOKSUniversal or shop level knowledge.
e.g. Surface-finish chart - limiting extremes of process
8 in - use grinding, polishing, lapping
Usually not with milling, however, finish milling may achieve the specification.
The information is general. It does not mean every machine or shop can achieve that accuracy.
Turning limit (6.3 - 0.4 m or 250 - 16 inch)
Diamond turning at Lawrence Livermore Lab
(12.5 nm or 0.47 inch)
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SURFACE FINISH CHART
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Dimensional accuracies for Process Planning
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HOLE MAKING KNOWLEDGEFollowing data is taken from a manufacturer's process planner's handbook.
I. Dia < 0.5"
A. True position > 0.010"
1. Tolerance > 0.010"
Drill the hole.
2. Tolerance < 0.010"
Drill and ream the hole.
B. True position < 0.010”
1. Tolerance < 0.010"
Drill, then finish bore the hole.
2. Tolerance < 0.002"
Drill, semi-finish bore, then finish bore the hole.
II. 0.05" < dia < 1.00"
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DECISION TABLESTo computerize the decision making, one simple way is to use decision tables.If the conditions set in an entry are satisfied, the actions in the entry areexecuted. The stub contains the condition or action statements. Entries markwhich conditions or actions are applicable. Each entry contain one rule.
Conditions
Actions
Stub Entries
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EXAMPLE DECISION TABLE
Dia < 0.5
0.5 < Dia < 1.0
T.P < 0.010
T.P < 0.010
Tol > 0.010
0.002 < Tol < 0.010
Tol < 0.002
Drill
Ream
Semi-finish bore
Finish bore
X X X X
XXXX X
X
X
X
X
X
X
XX X XX
XX X
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DECISION TREES
Node
Branch
To computerize the decision making, one simple way is to use decision trees.
Decision tree is a graph with a single root and branches emanating from theroot. Each branch has a condition statement associate with it. Actions are written at the terminal. Probabilities may be assigned to the branches. In this case, the tree represents probabilistic state transitions.
Root
terminal
The node may be "AND" nodesor "OR" nodes.
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EXAMPLE DECISION TREE
Dia < 0.5
0.5 < Dia < 1.0
T.P < 0.010
T.P < 0.010
Tol > 0.010
Tol < 0.010
0.002 < Tol < 0.010
Tol < 0.002
Drill
Drill, then ream
Drill, then finish bore
Drill, semifinish bore,then finish bore
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PROCESS-CAPABILITY ANALYSIS
; ; twist drilling (code 1); 111: hole( ( if (shape ! 111 = ) ( length ! 12.0 diameter ! * <= ) ( diameter! 0.0625 >= ) ( diameter! 2.000 <= ) ( tlp ! diameter ! 0.5 ** 0.007 * >= ) ( tln ! diameter ! 0.5 ** 0.007 * 0.003 + >= ) ( straightness ! length ! diameter ! / 3. ** 0.0005 * 0.002 + >= ) ( roundness ! 0.004 >= ) ( parallelism ! length ! diameter ! / 3. ** 0.001 * 0.003 + >= ) ( true ! 0.008 >= ) ( sf ! 100 >= ) )
PROCESS BOUNDARY Data
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PROCESSES, TOOLS, AND MACHINES
•
Process Sub-Process Cutters
Milling
Plain Shell end Hollow end Ball end
End milling
Peripheral milling Plain Slittting Saw Form Inserted-tooth Staggered-tooth Angle T-slot cutter Woodruff keyseat cutter Form milling cutter
Face milling Plain Inserted-tooth
Drilling
Twist drill Spade drill Deep-hole drill Gun drill Trepanning cutter Center drill Combination drill Countersink Counterbore
ReamingShell reamer Expansion reamer Adjustable reamer Taper reamer
Boring Adjustable boring bar Simple boring bar
BroachingForm tool
Machines
Vertical milling machine Horizontal milling machine Column-and-knee Bed type Planer type Special type Machining center
Column & upright Gang drilling machine Radial drilling machine Multispindle drilling machine Bench type Deepth hole drilling machine
Drill press Lathe
Lathe Boring machine Jig bore
Turning
Turning Facing Parting Knurling Boring Drilling Reaming
Plain Inserted
Knurling tool
Boring bars Drills Reamers
Speed lathe Engine lathe Toolroom lathe Special lathe Turret lathe Screw machine
Broaching press Vertical Pull-down Vertical Pull-up Surface broaching machine Horizontal broaching machine Surface broaching machine Rotary broaching machine
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PROCESSES, TOOLS, AND MACHINES
Shaping Form tool
Planing
Inserted tool
SawingHacksaw Bandsaw Circular saw
Process Sub-Process Cutters Machines
Grinding
Cylindrical grinding Centerless grinding Internal grinding External grinding Surface grinding
Reciprocating saw Band saw Circular saw
Shaper Horizontal & Vertical
Double housing planer Open-side planer Edge planer Pit Planer
Grinding wheels Points
External cylindrical grinder Internal cylindrical grinder Surface grinder Creep feed grinder Tool grinder Disk grinder
Honing Honing stone Honing machine
Lapping Lap Lapping machine
Tapping Tap Drill press Milling machine Machining center
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CUTTING EDGE AND FEED
Drill
cutting edge
Boring Reaming
Turning
Peripheral Milling
minor feed
Face Milling
feed range
Ball End Milling
Broaching Sawing
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VOLUME PRODUCING CAPABILITIESProcess Sub-Process Cutters
Milling
Plain Shell end Hollow end Ball end
End milling
Peripheral milling Plain Slittting Saw Form Inserted-tooth Staggered-tooth Angle T-slot cutter Woodruff keyseat cutter
Face milling Plain Inserted-tooth
Drilling
Twist drill Spade drill Deep-hole drill Gun drill Trepanning cutter Center drill Combination drill Countersink Counterbore
Reaming
Shell reamer Expansion reamer Adjustable reamer Taper reamer
BoringAdjustable boring bar Simple boring bar
Broaching Form tool
Volume Capabilities
flat bottom volume
round hole round hole deep round hole deep round hole large round hole shallow round hole multiple diameter round hole countersink hole counterbore hole
thin wall of round hole thin wall of round hole thin wall of round hole thin wall of round holethin wall of round hole thin wall of round hole
Turning
Turning Facing Parting Knurling Boring Drilling Reaming
Plain Inserted
Knurling tool
Boring bars Drills Reamers
? disk disk ? thin wall of round hole round hole thin wall of round hole
flat bottom volume slot step polyhedral through hole formed through volume
flat bottom volume slot formed volume T-slot Internal groove
pocket, slot, flat
sculptured surface, flat
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VOLUME PRODUCING CAPABILITIES
Shaping Form tool
Planing
Inserted tool
SawingHacksaw Bandsaw Circular saw
Process Sub-Process Cutters Volume Capabilities
Grinding
Cylindrical grinding Centerless grinding Internal grinding External grinding Surface grinding
?
flat bottom volume, slot
flat bottom volume
Grinding wheels Points
? internal wall of round hole flat bottom volume
Honing Honing stone ?
Lapping Lap most surfaces
Tapping Tap threaded wall of hole
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PROCESS TOLERANCE RANGEProcess Sub-Process Cutters
Milling
Plain Shell end Hollow end Ball end
End milling
Peripheral milling
Plain Slittting Saw Form Inserted-tooth Staggered-tooth Angle T-slot cutter Woodruff keyseat cutter Form milling cutter
Face milling Plain Inserted-tooth
Drilling
Twist drill Spade drill Trepanning cutter Center drill Combination drill Countersink Counterbore Deep-hole drill Gun drill
Reaming
Shell reamer Expansion reamer Adjustable reamer Taper reamer
BoringAdjustable boring bar Simple boring bar
Broaching Form tool
Turning
Turning Facing Parting Knurling Boring Drilling Reaming
Plain InsertedKnurling toolBoring bars Drills Reamers
Tolerances, surface finish, etc. capabilities
roughting finishing tol 0.002 0.001 flatness 0.001 0.001 angularity 0.001 0.001 parallelism 0.001 0.001 surface finish 50 30
roughting finishing tol 0.002 0.001 flatness 0.001 0.001 surface finish 50 30
roughting finishing tol 0.004 0.004 parallelism 0.0015 0.0015 surface finish 60 50
length/dia = 3 usual =8 maximum mtl < Rc 30 usual < Rc 50 maximum Dia Tolerance 0 - 1/8 +0.003 -0.001 1/8-1/4 +0.004 -0.001 1/4-1/2 +0.006 -0.001 1/2- 1 +0.008 -0.002 1 - 2 +0.010 -0.003 2 - 4 +0.012 -0.004
usuall best True position 0.008 0.0004 roundness 0.004 surface finish 100
Dia Tolerance < 5/8 0.0015 >5/8 0.002
surface finish > 100 straightness 0.005 in 6 inch
Dia Tolerance 0 - 1/2 0.0005 to 0.001 1/2- 1 0.001 1 - 2 0.002 2 - 4 0.003
roughting finishing roundness 0.0005 0.0005 true position 0.01 0.01 surface finish 125 50
length/dia 5 to 8
Dia Tolerance roughing finishing 0 - 3/4 0.001 0.0002 3/4- 1 0.0015 0.0002 1 - 2 0.002 0.0004 2 - 4 0.003 0.0008 4 - 6 0.004 0.001 6 - 12 0.005 0.002
straightness 0.0002 roundness 0.0003 true position 0.0001 surface finish 8
diameter tolerance to 1.0 0.001 1 - 2 0.002 2 - 4 0.003
surface finish 250 to 16
tolerance 0.001 surface finish 125 to 32
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PROCESS TOLERANCE RANGE
Shaping Form tool
Planing Inserted tool
Sawing Hacksaw Bandsaw Circular saw
Process Sub-Process Cutters
Grinding
Internal grinding Cylindrical grinding Centerless grinding External grinding Surface grinding
Honing Honing stone
Lapping Lap
Tapping Tap
Tolerances, surface finish, etc. capabilities
length tol squareness surface finish cutting rate material 0.01 0.2 200 - 300 3-6 sq in/min to Rc45 0.01 0.2 200 - 300 4-30 sq in/min to Rc45 0.008 0.2 125 7-36 sq in/min to Rc45
roughting finishing location tol 0.005 0.001 flatness 0.001 0.0005 surface finish 60 32 (cast iron) surface finish 125 32 (steel)
Dia Tolerance roughing finishing 0 - 1 0.00015 0.00005 1 - 2 0.0002 0.00005 2 - 4 0.0003 0.0001 4 - 8 0.0005 0.00013 8 - 16 0.0008 0.0002
Dia Tolerance roughing finishing 1 +0.0005-0.0 +0.0001-0.0 2 +0.0008-0.0 +0.0005-0.0 4 +0.0010-0.0 +0.0008-0.0
surface finish 4 roundness 0.0005
roughing finishing tolerance 0.000025 0.000015 flatness 0.000025 0.000012 surface fin 4-6 1-4
tolerance 0.003 roundness 0.003 surface fin 75
roughing finishing tolerance 0.0005 0.0001 parallelism 0.0005 0.0002 roundness 0.0005 0.0001 surface fin 8 2
roughing finishing tolerance 0.001 0.0001 parallelism 0.001 0.0001 surface fin 32 2
center ground
flat
and centerless
Internal
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AUTOMOTIVE PARTS REQUIREMENTS
• Cylinder bore 13 - 25 in honed
• Main bearing bore 63 - 200 in• Crankshaft bearing 3-13 in polished
• Brake drum 63-125 in turned
• Clutch pressure plate 25-100 in turned
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BASIC MACHINING CALCULATIONS
tm = L + L
v f
Machining time
Total amount of time to finish a workpiece.
For drilling, one pass turning, and milling:
L : clearance or overhang distance.
For multipass turning
n p =
Do – Di
2 a p
+
integer round up
For milling
n p = h
a p
+ w D
+
n p : # of passes
h : total height of material to be removed
w : workpiece width : cutter overlapping factor
= effective cutting width / tool dia 1.0
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BASIC MACHINING CALCULATIONS
Machine control parameters are: f, V, ap.
a. Feed and feedrate
f: inch / rev
turning or drilling
milling
rp m
N :# of teech in milling1 in drilling
n : rpm
V f = f nN
V f = f n
V f : inch / min
Vf
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BASIC MACHINING CALCULATIONSCutting speed
D: Diameter
Depth of cut
a p inch
a p =
Do – Di
2
D
V
surface speed
V in sfpm
Di
D0
V = D n12
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BASIC MACHINING CALCULATIONSMetal removal rate
MRR cutting time tool life
MRR in3minin3min
Drilling
Turning
Milling
W
v f
a p
MRR = D 2
4v f
= 3D f V
MRR =
( D2
o – D2
i)4
v f
= 6(Do – Di ) f V
v f
(D2o –D 2
i)4
MRR = a p w v f
=12 a p w n
Df V
D2
4
v f
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BASIC MACHINING CALCULATIONS
tm = L + L
v f
Machining time
Total amount of time to finish a workpiece.
For drilling, one pass turning, and milling:
L : clearance or overhang distance.
For multipass turning
n p =
Do – Di
2 a p
+
integer round up
For milling
n p = h
a p
+ w D
+
n p : # of passes
h : total height of material to be removed
w : workpiece width : cutter overlapping factor
= effective cutting width / tool dia 1.0
L
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CUTTING FORCE AND POWER
Process Sub-Process
Milling
End milling
Peripheral milling
Face milling
Drilling
Reaming
Boring
Shaping
Planing
Broaching
TurningFacing
Turning
Cutting Force F Power (hp)
KF f FapFDt
Fbw z
KF v FafFap
F bwFz FDt
F
KF f FapF
KF f FapF Dt
F
KF apF Dmzc
c (lb)
Fc Vc
33,000 m
Fc Vc
33,000 m
Fc Vc
33,000 m
Ts rpm63,030 m
where:
Vc :: cutting speed fpm m : machine efficiency Ts : Torque
torque
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MATERIAL REMOVAL RATE
Process Sub-Process
Milling
End milling
Peripheral milling
Face milling
Drilling
Boring
Shaping
Broaching
Turning
W: width of the cutter ap : depth of cut f : feed n : number of teeth N : spindle rpm
D : tool diameter
tr : rise per tooth W : Width of the tool V : cutting speed n : number of tooth in contact with part
12 tr W V n
( D2/4) f N
12 V f ap
12 V f ap
Facing
Turning
6 V f ap
L t f NsL : strock length Ns : number of strock per minute
W ap f n N
MRR
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CONSTRAINTS
nmin nw nmax
ntmin nt ntmax
Fc Fc,max
Spindle-speed constraint:workpiecetool
Feed constraint:
Cutting-force constraint:
Pm Pmax
Power constraint:
Ra Ra,max
Surface-finish constraint:
fmin f f max
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MODELSMultiple pass model
t pr th + (t i
mi = 1
n p
+t i
m
t t t)
c pr cb
nb+ cmth + ci
pri = 1
n pi : pass number
Additional constraint:
depth of cut
: number of passes is a function of the depth of cut.
a p
n p
Productivity model: pr
s – c pr
t pr
s: sale price/piece