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Capstone Design Team. CHI-A 20081838 20071223 20091798 20091804 20111901

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Bending Machine for Orthodontic Archwires

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1 Problem Statement Project Objectives 34 1 2 Test & Evaluation Index 3 Design Process 5 6 Final Product History Log

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4 Why is it expensive? Components Technique Expert (dental technician) Bracket Orthodontic Archwires Monopoly on technique Problem Statement 1 Dental clinic

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5 We decide to change the Current Situation Problem Statement 1 In USA and Europe there exist Bending Machines for Orthodontic Archwires. To Design a Bending Machine To Develop Local Techniques

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6 Why have we chosen this subject? Project Objectives 2 Designing a Bending Machine in our own way I.Less Expensive Product II.Local Production Makes Possibilities

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7 Project Objectives These are the objectives we will accomplish. Project Objectives 2 1 2 3

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8 Project Objectives Project Objectives 2 Linear motion Rotation Bending Wire 3 DOFs are needed for wire bending I. 3 degrees of freedom

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9 Project Objectives Project Objectives 2 Computer (LabVIEW) Processor (sbRIO) Motor operation II. Simple program to operation (LabVIEW)

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10 Project Objectives Project Objectives 2 III. High quality product CompetitorsObjectives Minimum bending length 2.2mm (Orametrix, USA) Less than 2mm Bending angle error less than 1.2 degree (Orametrix, USA) less than 1.2 degree 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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12 Concept Development & Analysis This page is about Our initial design concept and its development. Design Process 3 Linear motion Rotation Bending Wire

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13 Concept Selection This page is about the bending part. Design Process 3 Ideas for Actuation Part Bending in 2 ways to realize 3D product (X) design of the lower driving part = difficult Idea. A

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14 Concept Selection This page is about the bending part. Design Process 3 Ideas for Actuation Part Idea. B Grabs for holding a wire Bending (X) limitation: not able to 3Dproduct

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15 Concept Selection This page is about the bending part. Design Process 3 Ideas for Actuation Part Idea. C Grabs for holding a wire Bending Rolling This type satisfy all of required functions

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16 Concept Selection This page is about the bending part. Design Process 3 Ideas for Bending Part

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17 Concept Selection This page is about the bending part. Design Process 3 Ideas for Bending Part 1) Consideration - Force - Accuracy - Simplicity (Price, Space)

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18 Concept Selection This page is about the bending part. We confirmed that the step motor offers sufficient force for bending wires. Design Process 3 Spec 5 phases, 0.072deg/phase 3.64V, 1.4A 20N*m holding torque 1:10 gear ratio

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19 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 3 Three ideas for bending part Using hole Using clamp Using pin**

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20 Concept Development Finally, pins and guides are used for bending parts. Design Process 3 Guides Pins Engaging part of the Pin and the Motor Wire Motor Installing the two Guides in order to allow for bi-directional bending

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21 Manufacturing Hardware Stage This is our final design of bending machine. Design Process 3

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22 Manufacturing Hardware Stage This picture shows our assembled bending machine. Design Process 3

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23 Manufacturing Stage We are working on developing codes using Labview. Design Process 3 1. Initialization 2. Check 3d graph, first slope 3. Tuning the property of bending wire (company, shape, thickness)

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24 Manufacturing Stage We are working on developing codes using Labview. Design Process 3 Make pulses by bending point data Monitoring by array 1. Using first slope and data of bending point make pulse 2. The pulse go next step *Can monitoring

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25 Manufacturing Stage We are working on developing codes using Labview. Design Process 3 Control in FPGA 1. Linear motion, roll, bending in FPGA 2. Control motors by pulses

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26 Why is it required to have tests? Because of Spring-back effect, test is required. Test & Evaluation 4 By experiment, we need to figure out spring-back coefficient. Measure the angle while pulse is increasing.

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27 We did the experiment. Test & Evaluation 4 Fitted function We considered pulse(input signal) and bent angle(output). 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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28 After Assembling of the machine, we manufactured wires. Accuracy is very important as well as simple structure. However, errors occured. Test & Evaluation 4 Checking the Accuracy by comparison Graph of desired data ~ Bent wire on the test Good Accuracy - Desired accuracy Bad Accuracy - Visible error - Summation of error occur summation of error start from here

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29 We got better accuracy after spring-back test. Test & Evaluation 4 The bent wire and the graph exactly match together. (good accuracy) This result need to be verified by microscope.

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30 Bending Machine for Orthodontic archwires Maybe, Demonstration or Simulation Video will be shown here. Final Product 5

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31 History Log What we done. History Log 6 DatesubjectDatesubject 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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32 Any question and advice are welcome :D Do not hesitate. Just raise your hands. Question & Answer

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Thank You