Student ： Chao-Wen Chen Li-Wei Shen Teacher ： Ru-Li Lin Associate Professor Department of Mechanical Engineer Southern Taiwan University of Science and Technology 1

Title  Introduction to Reverse Engineering  3D Scanner Category  System Comparison  Workflow  CAD / CAM machining & Rapid Prototyping  Data Classification  Video  Q&A  References 2

Introduction to Reverse Engineering Development of computer hardware and software make 3D CAD/CAM has been rapid progress. Then in modeling is growing up to the forward- engineering and reverse engineering.  Reverse engineering is for no original design drawing files. For example : Curved surface, samples or models by hand made.  Integration of contact and non-contact 3D measurement system is mainly used to measure the complex surface shape of the point data.  Imitation working model, the follow-up after editing, the work is usually performed imitation, such as shoe mold, golf club, that will be able to copy it.  To put CAM into the machine tools or rapid prototyping and the model will be produced. 3

3D Scanner Category-Contact Type Advantage ：  High accuracy and reliability.  Nothing to do with the reflection of the work piece.  Suitable for general basic shape measurement. Disadvantage ：  Use special fixtures.  Probe ball need to be revision, easy to abrasion caused by contact force.  Incorrect operation easily damage the work piece.  Low speed. E-trigger probe and CMM 4

The Contact Probe of The Dynamic Principle Measuring head touched the object, the signal will turn ON to become OFF and mark the point. 5

Contact probe scanning pattern of results 6

3D Scanner Category-Contactless Type Contactless Type ： 1.Blu-ray 3D laser scanner 2.CCD grating 3D scanner Advantage ：  Not need to do the probe radius compensation.  Measuring speed is very fast.  Not considered material. Disadvantage ：  Poor measurement accuracy.  The color and curvature are susceptible to limit.  Need to handle the mixed signal.  Roughness of the surface will affect the measurement results. 7

3D laser scanner of The Dynamic Principle Non-contact measurement system is used to LED or laser light source, a condenser lens direct rays of the work piece to be measured by the object, the reflection of light can detect the position of the coordinate values ​​ from the sensor. 8

CCD grating for dynamic 3D scanner principle Such principle as the corresponding function method is finding the relationship between measurement plane spatial coordinates and CCD imaging methods. When you scan, the space corresponding function will compute to reduce the dislocation problem. 9

Non-contact 3D scanning of graphical results 10

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System Comparison 12 Contact TypeContactless Type(Laser) Contactless Type(CCD grating) TimeLongerMediumFast RangePointLinesurface DensitySparsely pointHigh Density pointMost High Density point Curve surfaceHardPartial limitLimitless Material restrictions High hardnessLimitless Accuracy of measurement <5μm<50μm Measurement placeFixed Platform Easy to carry

Workflow Blu-ray 3D laser scanner 13 ModelScannerCreate 3D model 3D CAD RP CAM completeCAD/CAE Adjustment

Produce single-point data Using 3D laser scanner to scan model. There will need 5 surface scan data. If the data is not enough, it will not completely to go next stage. 14

Overlap Each Data After the scan is complete and you can overlap each data. To select obvious characteristic curves to overlap and you can get the original object and a similar file data after completion. 15

Converted Into A Triangle Mesh 16

Capture Features And Contour Lines Turn Into The Entity Performed The Entity Reconstruction 17

CAD / CAM machining & Rapid Prototyping 18

Data Classification-Artworks  Toy Design Fine structural design, form design, movable joint design.  Doll Design Scan collectible doll filing.  Artifacts Collection Using technology to restore the damaged artwork or copy art. CAD/CAM technology is mainly used in the industrial, but with the technology evolution, it has been able to assist with a combination of traditional art and design techniques. 19

Data Classification-Industrial Products  Mold Industry Can quickly determine the location of critical dimensions.  Auto Industry 3D printing systems used to develop prototypes and design.  Technology Industry The reverse engineering tools into a 3D model, you can quickly complete the design. 3D scanning can be used in the aerospace industry and its surrounding parts production purposes, requirements of the aerospace parts to process the related aerospace production, manufacturing, design, testing and other projects. 20

Video 21

Q&A 22

References  機械工程概論 - 電腦整合技術應用 ， 徐祥禎 機械工程概論 - 電腦整合技術應用 ， 徐祥禎  快速成型原理與分類 ， 蘇嘉祥老師 ， 南台科技大學 快速成型原理與分類 ， 蘇嘉祥老師 ， 南台科技大學  逆向工程作業流程之實務應用 - 汽車後視鏡 ， 賴俊利 逆向工程作業流程之實務應用 - 汽車後視鏡 ， 賴俊利  以逆向工程技術應用於風扇葉片模型之重建研究 ， 吳永裕講師 ， 聖約翰科技大學 。 以逆向工程技術應用於風扇葉片模型之重建研究 ， 吳永裕講師 ， 聖約翰科技大學 。  逆向工程於精密產品設計與檢測之應用 ， 蔡佳憲工程師 ， 寶源 科技股份有限公司 。 逆向工程於精密產品設計與檢測之應用 ， 蔡佳憲工程師 ， 寶源 科技股份有限公司 。   馬路科技顧問股份有限公司   君霟有限公司 23

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