introduction of net-shape...
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2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Introduction of Net-Shape Manufacturing
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Introduction to Net Shape Manufacturing
An example
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Introduction to Net Shape Manufacturing
Geometrical ParametersTool geometry
Workpiece geometry
Process ParametersDie and tool motion
TemperatureLubrication
Material
Material ParametersWorkhardening
Strain rate sensitivityAnisotropy
Temperature
INPUT
PROCESS MODELING
Process Analysis And Optimization
Loads, energies, stresses, strains, temperature,
metal flow (geometrical change)
Primary product Requirements
Forming limits
Secondary product requirements
Tolerance, surface property etc.
Equipment
Capacity limitations
CONSTRAINTS
OUTPUT
Determination of process
geometry and process
performance
condition
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
1-1 사출성형의 일반원리
1. 사출성형의 일반 원리 및 특징
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Injection Molding System
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Polymer를 Hopper로부터 Barrel내로 투입, Heater와 screw 회전에 의한 마찰열로 운용.Screw 회전으로 용융수지를 screw 전방으
로 이동
Hydraulic unit force 로 용융수지를 delivery system을 통해 cavity 내로 충진
용융수지가 충분히 고화, 냉각될 때까지 냉
각 후 취출
The three stages of injection molding : injection, plastication (feeding), ejection
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
1-2 사출성형의 특징
대량생산에 유리(Ex) Cycle time : 30sec, Cavity 2, 하루 생산량 : 5760개
복잡한 형상의 부품가공에 적합
Process에 재한 이론적 해석의 한계- 급격한 물성변화
(Solid Solid+Liquid liquid Solid+Liquid Solid)
- 용융 Plastic의 특징 : Viscosity와 Specific Volume이 각각 Shear rate 및Pressure에 Dependent.
(Ex.) 평판사이의 유동 : Classical Hele-Shaw Flow Governing Eqn.
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Typical injection molding cycle
(1) Filling(2) Post filling(3) Mold opening(4) Holding stages
몰드의 압력 변화
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
2. 사출성형 CAE S/W의 이용
경험과 직관에 의존
제품 DESIGN 설계, DRAWING
금형제작
시사출 금형수정
수정사항 선정
양산
O.K
-Delivery system-Cooling channel
layout
-사출조건
Yes
No
2-1 기존사출성형의 제품생산 Flow
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
2-2 CAE가 적용된 사출성형의 제품생산 Flow제품 DESIGN 설계, DRAWING
CAE Simulation-Delivery system-사출조건-Cooling channel layout
금형제작
시사출
O.K
Simulationagain?
금형수정
수정사항 선정
-금형수정에 필요한 시간, 비용의 절감
-우수한 품질의 제품생산 가능
양 산Yes
Yes
No
No
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
3. 사출성형 CAE S/W(C-mold) 구성/기능
3-1 C-mold의 개요
개발처 : CIMP (Cornell injection molding program)ACT (Advanced CAE technology USA)
개발시작 : 1974
사업용 Version 완성 : 1986
Module 구성 : C – PRE/POST ProcessorC – DESIGN – DESIGN ProcessorC – FLOWC – PACKC – COOL SOLVERC – WARPC – GASFLOE
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Module별 기능
Module 주요기능 주요output 주요 용도
C-flow 충진해석 Pressure
Temperature
Shear rate
M/F advancement
Clamp force etc.
Gate 위치, 개수
최적사출시간 선정
C-pack 보압해석 C-flow
Vol. Shrinkage
Sink index etc.
균일한 압력, 수출률분포 확보
C-cool 냉각해석 Mold wall temp.
Mold wall heat flux temp.
Difference cooling channel efficiency etc.
균일 냉각
pattern cooling channel layout
냉각시간결정
C-warp 변형해석 각 방향의 변형량 후변형량 최소화
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Bonding and Packing
Schematic illustrations of IC packing
Chip-on-board attachment
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Transfer-molding press schematic Runner design
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Viscosity : Cross-Exp polymer viscosity model
Master plot for PS-BMWD
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Specific volume: Modified tait polymer density model
Amorphouspolymers
Crystallinepolymer
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
PVT data for flow analysis
PVT plot for semi-crystalline material PVT plot for amorphous material
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Analysis and technology in Metal Forming
2009-2 Net-Shape ManufacturingMechanical EngineeringYonsei University
Machined part geometry transfer
via IGES
Forging design
Finisher design
Blocker design
FEM simulation
Modificationneeded
CNC machinethe dies
Preliminary design
VerificationAlpid system
Alpid system
Expert system
CAD/CAM procedure of forging die design