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Technical Brief

Topology Optimization and Prototype of a Three-Dimensional Printed Compliant Finger for Grasping Vulnerable Objects With Size and Shape Variations

[+] Author and Article Information
Chih-Hsing Liu

Department of Mechanical Engineering,
National Cheng Kung University,
Tainan 701, Taiwan
e-mail: chliu@mail.ncku.edu.tw

Chen-Hua Chiu

Department of Mechanical Engineering,
National Cheng Kung University,
Tainan 701, Taiwan
e-mail: zas988777@gmail.com

Ta-Lun Chen

Department of Mechanical Engineering,
National Cheng Kung University,
Tainan 701, Taiwan
e-mail: luciferluxn@gmail.com

Tzu-Yang Pai

Department of Mechanical Engineering,
National Cheng Kung University,
Tainan 701, Taiwan
e-mail: a19936161@gmail.com

Mao-Cheng Hsu

Department of Mechanical Engineering,
National Cheng Kung University,
Tainan 701, Taiwan
e-mail: qwe.566@gmail.com

Yang Chen

Department of Mechanical Engineering,
National Cheng Kung University,
Tainan 701, Taiwan
e-mail: balrog705@gmail.com

Contributed by the Mechanisms and Robotics Committee of ASME for publication in the JOURNAL OF MECHANISMS AND ROBOTICS. Manuscript received July 29, 2017; final manuscript received April 1, 2018; published online May 31, 2018. Assoc. Editor: Hai-Jun Su.

J. Mechanisms Robotics 10(4), 044502 (May 31, 2018) (9 pages) Paper No: JMR-17-1231; doi: 10.1115/1.4039972 History: Received July 29, 2017; Revised April 01, 2018

This study presents a topology optimization method to synthesize an innovative compliant finger for grasping objects with size and shape variations. The design domain of the compliant finger is a trapezoidal area with one input and two output ports. The topology optimized finger design is prototyped by three-dimensional (3D) printing using flexible filament, and be used in the developed gripper module, which consists of one actuator and two identical compliant fingers. Both fingers are actuated by one displacement input, and can grip objects through elastic deformation. The gripper module is mounted on an industrial robot to pick and place a variety of objects to demonstrate the effectiveness of the proposed design. The results show that the developed compliant finger can be used to handle vulnerable objects without causing damage to the surface of grasped items. The proposed compliant finger is a monolithic and low-cost design, which can be used to resolve the challenge issue for robotic automation of irregular and vulnerable objects.

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Figures

Grahic Jump Location
Fig. 3

Design scheme for the compliant finger: (a) design domain and (b) analysis domain and boundary conditions

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Fig. 2

Design scheme for the compliant gripper

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Fig. 1

Flowchart of the topology optimization procedure

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Fig. 8

Grasping object (orange) using the developed compliant gripper: (a) before rasping, (b) grasped, and (c) close mode at no object condition

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Fig. 14

Geometric advantage (GA) of the 3D printed compliant finger

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Fig. 9

Robotic grasping system

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Fig. 10

Grasping vulnerable objects with size and shape variations by using the proposed compliant gripper: (a) guava, (b) kiwi, (c) grapefruit, (d) apple, (e) wine glass, (f) wine glass, (g) spiral bulb, (h) glass, (i) balloon, (j) water balloon, (k) paper box, and (l) empty bottle water

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Fig. 13

Mechanical advantage (MA) of the 3D printed compliant finger

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Fig. 4

Iterative results for normalized objective function and volume fraction values

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Fig. 5

Topology optimization results at some specific iterations (Iter = 207 figure shows the converged result)

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Fig. 6

Three-dimensional printed compliant finger based on the optimized design from topology optimization

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Fig. 7

Gripper module: (a) prototype of the gripper module (with two compliant fingers) and (b) gripper actuator design

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Fig. 11

Payload test (the maximum payload is 2.2 kg)

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Fig. 12

Input and output forces of the 3D printed compliant finger

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