Chapter 1. Introductionocw.snu.ac.kr/sites/default/files/NOTE/9123.pdf · 2018-01-30 · 2 3 4 5 6...

$Page 1: Chapter 1. Introductionocw.snu.ac.kr/sites/default/files/NOTE/9123.pdf · 2018-01-30 · 2 3 4 5 6 7 8 4 8 Material removing process-cutting ... fracture occurs at UTS. ... •Lighting$
M2794.001800 M A T E R I A L A N D M A N U F A C T U R I N G P R O C E S S E S

Chapter 1. Introduction

Prof. Sung-Hoon Ahn ( )

School of Mechanical and Aerospace Engineering

Seoul National University

September 2, 2014

2

© Prof. Ahn, Sung-Hoon

Creation of Adam

Michelangelo Buonarroti (1508-1516)

3


(FIB) Focused Ion Beam

Manufacturing

Size of typical parts and the capabilities of manufacturing processes

4


Manufacturing

Manufacturing ( , , )

• Latin: manus (hand) + factus

(make)

“To make by hands or, especially

by machinery, often on a large

scale and with division of labor”

(Webster Dictionary)

( ) :

(Yahoo dictionary)

ː ( ) :

( ) :

5


Importance of manufacturing

2014 2013

Gross Domestic Products(GDP)

Total Employees

Manufacturing industry:(14.3%)

Others:(19.8%)

Service Industry:(65.8%)

출처 : Statistics Korea (http://www.kosis.kr)

Manufacturing industry:(34%)

Others:(28%)

Service Industry:(38%)

6


Textbook

Schedule

Homework

Exam

Term project

Website

http://fab.snu.ac.kr

http://etl.snu.ac.kr

TAs

(Bldg. 301-1405/ 880-9073/ [email protected])

(Bldg. 301-1405/ 880-9073/ [email protected])

Syllabus

mailto:[email protected]

mailto:[email protected]

7


Textbook

8


Textbook

Ch 1. Introduction

Ch 2. Fundamentals of the Mechanical Behavior of Materials

Ch 3. Structure and Manufacturing Properties of Metals

Ch 4. Surfaces, Tribology, Dimensional Characteristics, Inspection, and Product Quality Assurance

Ch 5. Metal-Casting Processes and Equipment; Heat Treatment

Ch 6. Bulk Deformation Processes

Ch 7. Sheet-Metal Forming Processes

Ch 8. Material-Removal Processes: Cutting

Ch 9. Material Removal Processes: Abrasive, Chemical, Electrical, and High-Energy Beams

Ch 10. Properties and Processing of Polymers and Reinforced Plastics; Rapid Prototyping and Rapid

Tooling

Ch 11. Properties and Processing of Metal Powders, Ceramics, Glasses, Composites, and

Superconductors

Ch 12. Joining and Fastening Processes

Ch 13. Fabrication of Microelectronic and Micromechanical Devices

Ch 14. Automation of Manufacturing Processes and Systems

Ch 15. Computer-Integrated Manufacturing Systems

Ch 16. Product Design and Competitive Aspects of Manufacturing

Chapters to be covered

9


Schedule화목 1.5-1.5 at 301-118

Week Sun Mon Tue Wed Thu Fri Sat Day Chap. 진도 HW

31 1 2 3 4 5 6 2 1 Introduction

4 1 Introduction

7 8 9 10 11 12 13 9 휴강 추석

11 2 Fundamentals of the mechanical behavior of materials

14 15 16 17 18 19 20 16 2 Fundamentals of the mechanical behavior of materials Ch.02

18 3 Structure and manufacturing properties of metals

21 22 23 24 25 26 27 23 3 Structure and manufacturing properties of metals

25 4 Surfaces/dimensional characteristics/inspection/QA Ch.03~04

28 29 30 1 2 3 4 30 5 Metal casting process and equipment

2 5 Metal casting process and equipment Ch.05

5 6 7 8 9 10 11 7 6 Bulk/sheet metal forming processes

9 휴강 한글날

12 13 14 15 16 17 18 14 6 Bulk/sheet metal forming processes Ch.06

16 7 Sheet-metal forming processes

Meeting Team meeting with professor

19 20 21 22 23 24 25 21 7 Sheet-metal forming processes Ch. 07

23 휴강 자율학습일

26 27 28 29 30 31 1 28 중간고사

30 중간발표

2 3 4 5 6 7 8 4 8 Material removing process-cutting

6 8 Material removing process-cutting Ch. 08

9 10 11 12 13 14 15 11 9 Material removal process-abrasive/chemical/electrical/high-energy beams

13 9 Material removal process-abrasive/chemical/electrical/high-energy beams

16 17 18 19 20 21 22 18 9 Material removal process-abrasive/chemical/electrical/high-energy beams

20 10 Properties and processing of polymers/reinforced plastics-RP

23 24 25 26 27 28 29 25 10 Properties and processing of polymers/reinforced plastics-RP

27 10 Properties and processing of polymers/reinforced plastics-RP Ch.09~10

Meeting Team meeting with professor

30 1 2 3 4 5 6 2 11 Properties and processing of metal powders/ceramics/glasses/composites

4 12 Joining and fastening processes Ch.11~12

7 8 9 10 11 12 13 9 기말발표

11 기말고사, 과제 제출

14 15 16 17 18 19 20

21 22 23 24 25 26 27

수업일

휴일

성적 제출

마감

Dec

종강

17

수업 2/4선

2추석 추석 추석

M2794.001800 재료와 제조공정(Material and Manufacturing Processes)

Sep

1

4

3

수업 1/4선

개천절

한글날

Oct

5

7

6

9

자율학습일8

자율학습일

Nov

10

11

12수업 3/4선

14

13

16

15

동계 휴가

시작

10


Schedule

Lab tour

Equipment, facilities in IDIM

Detail information will be noticed

Project presentation

It might take total 120min for mid/final presentations (5min * 20teams)

Supplementary lecture

11


Homework

12


Exam

Mid-term + Final exam

Examples Determine whether the following statements are true or false.

Mark T if it is true, otherwise F.

a. During tensile test, necking occurs between yield strength and Ultimate Tensile Strength. ( )

b. In general brittle ceramic, fracture occurs at UTS. ( )

Answer the following questions in a couple of sentences.

a. Explain about ‘Hall-Petch Equation.

13


Exam

(a) Above figure is a general type of mold used for sand casting. Write each name and

its function of (A) ~ (D).

(b) Compare the process capability index Cp and Cpk. Explain which index would be

more appropriate to describe the process capability. (If necessary, draw the graph.)

(c) Assume that mass of part made from the above sand casting process should be

within 15 0.50 kg. It is proposed to use and charts to control this weight. After

several subgroups of 10 parts each have been taken, the average of average is 14.88

kg, and the average of range is 1.24 kg. Calculate Cp and Cpk. (Assume normal

distribution.)

(A)

(C)

(D)

(B)

14


Term Project

Topics:

Any topic is possible, but preferred materials and equipment include:

• Composites

• SMA (Shape Memory Alloy)

• IPMC

• NPDS

• RP

• Injection Molding

• SEM

• High speed camera

※ There are additional points for patent, registered program and journal paper.

15


Term Project

Team

5~6 members in one team

Each team can use maximum 250,000 won budget

Presentation

Mid-term + final presentation

Team meeting with prof. before presentation

16


Term Project

Examples

Manufacturing process(2009, 2012)

• Lighting ski pole

• Walking Supporting Device

• Manufacturing CFRP Skate Blade

• LED, Light Emitting Diode embedded GFRP, Glass Fiber Reinforced Plastic

Options

Lighting ski pole

No need to replace batteries.

No need to replace batteries.

– Energy harvesting

Mechanical-Electric system

관 계 식 비고

진동시스템의 상대적 거리

Mechanical System

Input(y(t))에 따른

output(z(t))의 크기와 위상차

전자기 유도에 의해 발생하는

e.m.f,

축전기 연결 system

Solidworks Design

Drawings

Qualification of Pole

High Stiffness

High Strength

Low Thermal conductivity

Low Density

Appropriate material

Material

Polycarbonate

Process

Cylinder shape

Turning operation

Polycarbonate

Lighting ski pole

Manufacturing Process Term Project

Final Presentation5th Team

Walking Supporting Device

For your Happy Silver Life



?





Anywhere!



How it Works



Normally : 137 ÷ 12 ÷ 0.004 = 286N/m

How it Made

Assume Avg. W : 70kg

Assume Leaning : 20%

Set Size : 120 x 100 mm2

Set Number : 12 module

With Obstacles : 137 ÷ 4 ÷ 0.004 = 858 N/m



ExtrusionRolling

Drilling

Welding

Injection Molding

How it Made



..

Patents

35

10조

2003-11748정영배

2004-11655서종민

2004-11734정태부

2004-11737조성제

2004-11745조한수

36

Reaction Force Test : Experiment ExplanationI 4 52 3

37

-200

0

200

400

600

800

1000

1200

0 1 2 3

Forc

e(N

)

시간(sec)

두 발로 70cm 높이에서 뛰었을 때

가해지는 하중

X축

Y축

Z축

F

953 N

Reaction Force Test : Experiment ResultI 4 52 3

1764 N

-500

0

500

1000

1500

2000

0 0.5 1 1.5 2 2.5 3

Forc

e(N

)

시간(sec)

한 발로 70cm 높이에서 뛰었을때

가해지는 하중

X축

Y축

Z축

F

Maximum

Possible

Force!

38

ANSYS Analysis : Maximum Shear StressI 4 52 3

39

ANSYS Analysis : Solution InformationI 4 52 3

• 94g

Weight

• 42.5Mpa

Maximum Principal Stress

• 23.8Mpa

Maximum Shear Stress

• 1.19x 10-4

Maximum Principal Strain

• 2.189 x10-5m

Total Deformation

40

Prototype Fabrication : Blade ManufacturingI 4 52 3

Water-jet Cutting Epoxy Adhesive

41

I 4 5 62 3 Practical Issues : WeightI 4 52 3

310/92=3.37

CFRP

Steel

42

Practical Issues : Ice Skating4 52 3I 4 52 3I



LED, Light Emitting Diode embedded GFRP, Glass Fiber Reinforced Plastic

Hong Seung-ilCho Yu-binHan Sang-junHan Won-youngHeo Chang-min



Contents

• Summary of Mid Presentation: What are we going to make? “Marvelous Illuminating Plate !”

• Process of Making “M.I.P”: Determine LED type, design circuit, lay up GFRP.

• Applications: It’s Strong light source, but also Water-proof !



Summary of last Presentation

At last presentation, we introduced LED, GFRP.

Our concept of this Project is,

: Combination of each other.

+


Final Presentation5th Team Final Presentation5th Team



Making Process

Choose a LED : A LED with an intergrated Circuit

Design the Circuit Diagram : A parallel circuit with Dimming system

Lay up GFRP : Fill up a vacancy – Handmade(!) GFRP slice



Applications

2 Key words of M.I.P

Hard strength

Water-proof

☞ It can be applied to the any parts!!



Date post:	23-Apr-2019
Category:	Documents
Upload:	nguyenthien
View:	219 times
Download:	1 times

Chapter 1. Introductionocw.snu.ac.kr/sites/default/files/NOTE/9123.pdf · 2018-01-30 · 2 3 4 5 6...

Documents