Transcript Bending Machines

Capstone
Design
Team. CHI-A
정준영 20081838
전우준 20071223
김건식 20091798
김병찬 20091804
한일환 20111901
Bending Machine for
Orthodontic Archwires
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2
Problem
Statement
Project
Objectives
Index
3
5
1
Design
Process
Final
Product
4
6
Test &
Evaluation
History
Log
3
1
Why is it expensive to have
Orthodontic Instruments?
Problem
Statement
In this page, we are trying to find out the reasons.
Dental clinic
• Expert (Dentist)
• Apparatus
Components
• Bracket
• Orthodontic
Archwires
Technique
• Patents
• Monopoly on
technique
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We decide to change the
Current Situation
No precede Korean technical development and patent, yet.
1
Problem
Statement
In USA and Europe
there exist Bending Machines
for Orthodontic Archwires.
<Our Goal>
 To Design a Bending Machine
 To Develop Local Techniques
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Why have we chosen this
subject?
These followings are the reasons we have chosen the topic.
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Project
Objectives
Designing a Bending Machine in our own way
Makes
Possibilities
I. Less Expensive Product
II. Local Production
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2
Project
Objectives
Project
Objectives
These are the objectives we will accomplish.
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Hardware
(3 DOFs ; linear motion, Rotation, bending)
2
Simple program to operation
3
High-quality product
(LabVIEW)
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2
Project
Objectives
Project
Objectives
I. 3 degrees of freedom
Wire
Linear motion
Rotation
Bending
3 DOFs are needed for wire bending
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2
Project
Objectives
Project
Objectives
II. Simple program to operation (LabVIEW)
Computer
(LabVIEW)
Processor
(FPGA)
Motor
operation
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2
Project
Objectives
Project
Objectives
III. High quality product
Competitors
Objectives
Minimum
bending length
2.2mm
(Orametrix, USA)
Less than 2mm
Bending angle
error
less than 0.8 degree
(Orametrix, USA)
(experiment need)
Bending time
40 seconds
(Orametrix, USA)
Less than 40 seconds
Available wire
shape
round and square
(Orametrix, USA),
square
(3M, Germany)
round and square
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3. Design Process
1) Concept Development&Analysis
2) Concept Selection
3) Manufacturing Hardware
4) Developing Software
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Concept
Development & Analysis
Design
Process
This page is about Our initial design concept and its development.
Wire
Linear motion
Rotation
Bending
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Concept
Selection
This page is about the bending part.
3
Design
Process
Ideas for Actuation Part
Idea. A
Bending in 2 ways → to realize 3D product
(X) design of the lower driving part = difficult
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3
Concept
Selection
Design
Process
This page is about the bending part.
Ideas for Actuation Part
Idea. B
Grabs for
holding a wire
Bending
(X) limitation: not able to 3Dproduct
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3
Concept
Selection
Design
Process
This page is about the bending part.
Ideas for Actuation Part
Idea. C
Rolling
Grabs for
holding a wire
Bending
This type satisfy all of required functions
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Concept
Selection
This page is about the bending part.
3
Design
Process
Ideas for Bending Part
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Concept
Selection
This page is about the bending part.
3
Design
Process
Ideas for Bending Part
1) Consideration
- Force
- Accuracy
- Simplicity (Price, Space)
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3
Concept
Selection
This page is about the bending part. We confirmed that the step motor offers
sufficient force for bending wires.
Design
Process
Spec
5 phases, 0.072deg/phase
3.64V, 1.4A
20N*m holding torque
1:10 gear ratio
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3
Concept
Selection
This page is about the bending part. Among three concepts, we had to select the one after the
consideration about simplicity and accuracy.
Design
Process
Three ideas for bending part
•
Using clamp
•
Using hole
•
Using pin**
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3
Concept
Development
Design
Process
Finally, pins and guides are used for bending parts.
Pins
Wire
Installing the two Guides
in order to allow for
bi-directional bending
Guides
Motor
Engaging
part of the
Pin and the
Motor
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Manufacturing
Hardware Stage
This is our final design of bending machine.
3
Design
Process
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Manufacturing
Hardware Stage
This picture shows our assembled bending machine.
3
Design
Process
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Manufacturing
Stage
We are working on developing codes using Labview.
3
Design
Process
1. Initialization
2. Check 3d graph,
first slope
3. Tuning the
property of bending
wire (company, shape,
thickness)
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Manufacturing
Stage
We are working on developing codes using Labview.
3
Design
Process
1. Using first slope
and data of bending
point make pulse
2. The pulse go next
step
*Can monitoring
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Manufacturing
Stage
We are working on developing codes using Labview.
3
Design
Process
1. Linear motion, roll,
bending in FPGA
2. Control motors by
pulses
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4
Why is it required
to have tests?
Test &
Evaluation
Because of Spring-back effect, test is required.
𝒑𝒖𝒍𝒔𝒆 = 𝒇 𝒄, 𝒔, 𝒘, 𝝋, 𝜽𝒅
𝑐 ∶ 𝑐𝑜𝑚𝑝𝑎𝑛𝑦, 𝑠 ∶ 𝑠ℎ𝑎𝑝𝑒, 𝑤 ∶ 𝑤𝑖𝑑𝑡ℎ,
𝜑 ∶ 3𝐷 𝑏𝑒𝑛𝑑𝑖𝑛𝑔 𝑎𝑛𝑔𝑙𝑒,
𝜃 𝑑 : 𝑑𝑒𝑠𝑖𝑟𝑒𝑑 𝑏𝑒𝑛𝑑𝑖𝑛𝑔 𝑎𝑛𝑔𝑙𝑒
By experiment, we need to figure out spring-back coefficient.
Measure the angle while pulse is increasing.
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4
We did the experiment.
We considered pulse(input signal) and bent angle(output).
Test &
Evaluation
Fitted function
These kind of experiments were conducted by Protractor.
(instead of microscope because of the situation of a corporation)
In final presentation, this slide would filled with experiment data.
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After Assembling of the machine,
we manufactured wires.
Accuracy is very important as well as simple structure. However, errors occured.
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Test &
Evaluation
Checking the Accuracy by comparison
Graph of desired data ~ Bent wire on the test
summation
of error
Bad Accuracy
- Visible error
- Summation of error occur
start from
here
Good Accuracy
- Desired accuracy
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We got better accuracy after
spring-back test.
The bent wire and the graph exactly match together. (good accuracy)
4
Test &
Evaluation
This result need to be
verified by microscope.
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Bending Machine for
Orthodontic archwires
Maybe, Demonstration or Simulation Video will be shown here.
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Final
Product
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6
History Log
History
Log
What we done.
Date
subject
Date
subject
9/11
Problem statement, Background,
Concept development,
10/26
Final presentation from
9/18
Patent(check, confirmation), Get
useful knowledge for design
process
11/6
Make form of algorithm
(software), assembling
hardware
9/25
Check necessary parts, Mechanism
of concept, Design thinking
11/13
Make code of algorithm
(software), assembling
hardware
10/2
Find existing machine, Design
selection, Use paper
11/20
Re-arrange algorithm
(Labview), spring back
coefificient test
10/6
Spec of motor, Design thinking,
choose final concept (actuation
part)
11/28,
12/5
Repeat the Test in terms of
input and output to minimize
the error
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Any question and advice
are welcome :D
Do not hesitate. Just raise your hands.
Question
& Answer
32
Thank You