Soft robotic grippers are required for power grasping of objects without inducing damage. Additive manufacturing can be used to produce custom-made grippers for industrial robots, in which soft joints and links are additively manufactured. In this study, a monoblock soft robotic gripper having three geometrically gradient fingers with soft sensors was designed and additively manufactured for the power grasping of spherical objects. The monoblock structure design reduces the number of components to be assembled for the soft gripper, and the gripper is designed with a single cavity to enable bending by the application of pneumatic pressure, which is required for the desired actuation. Finite element analysis (FEA) using a hyperelastic material model was performed to simulate the actuation. A material extrusion process using a thermoplastic polyurethane (TPU) was used to manufacture the designed gripper. Soft sensors were produced by a screen printing process that uses a flexible material and ionic liquids. The grasping capability of the manufactured gripper was experimentally evaluated by changing the pneumatic pressure (0–0.7 MPa) of the cavity. Experimental results show that the proposed monoblock gripper with integrated soft sensors successfully performed real-time grasp detection for power grasping.
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Trivedi, D., Rahn, C. D., Kier, W. M., & Walker, I. D. (2008). Soft robotics: Biological inspiration, state of the art, and future research. Applied Bionics and Biomechanics, 5, 99–117.
Albu-Schäffer, A., Eiberger, O., Grebenstein, M., Haddadin, S., Ott, C., Wimbock, T., et al. (2008). Soft robotics: From torque feedback controlled lightweight robots to intrinsically compliant systems. IEEE Robotics & Automation Magazine, 15, 20–30.
Amend, J. R., Brown, E. M., Rodenberg, N., Jaeger, H. M., & Lipson, H. (2012). A positive pressure universal gripper based on the jamming of granular material. IEEE Trans Robot., 28, 341–350.
Hu, W., & Alici, G. (2020). Bioinspired three-dimensional-printed helical soft pneumatic actuators and their characterization. Soft Robotics, 7(3), 267–282.
Sun, T., Chen, Y., Han, T., Jiao, C., Lian, B., & Song, Y. (2020). A soft gripper with variable stiffness inspired by pangolin scales, toothed pneumatic actuator and autonomous controller. Robot CIM-INT Manufacture, 61, 1–12.
Zolfagharian, A., Kouzani, A. Z., Khoo, S. Y., Moghadam, A. A. A., Gibson, I., & Kaynak, A. (2016). Evolution of 3D printed soft actuators. Sensors and Actuators A: Physical, 250, 258–272.
Yang, H., Lim, J. C., Liu, Y., Qi, X., Yap, Y. L., Dikshit, V., et al. (2017). Performance evaluation of projet multi-material jetting 3D printer. Virtual and physical prototyping, 12, 95–103.
Wang, Z., & Hirai, S. (2016, December). A 3D printed soft gripper integrated with curvature sensor for studying soft grasping. In 2016 IEEE/SICE International Symposium on System Integration (SII) (pp. 629-633). IEEE..
Mazzolai, B., Margheri, L., Cianchetti, M., Dario, P., & Laschi, C. (2012). Soft-robotic arm inspired by the octopus: II. From artificial requirements to innovative technological solutions. Bioinspiration Biomimetics, 7, 1–14.
Margheri, L., Laschi, C., & Mazzolai, B. (2012). Soft robotic arm inspired by the octopus: I. From biological functions to artificial requirements. Bioinspiration. Biomimetics., 7, 1–12.
Drotman, D., Ishida, M., Jadhav, S., & Tolley, M. T. (2019). Application-driven design of soft 3-D printed, pneumatic actuators with bellows. IEEE/ASME Transaction on Mechatronics., 24, 78–87.
Ku, S., Myeong, J., Kim, H., & Park, Y. (2020). Delicate fabric handling using A soft robotic gripper with embedded microneedles. IEEE Robotics and Automation Letter., 5, 4852–4858.
Champatiray, C., Mahanta, G. B., Pattanayak, S. K., & Mahapatra, R. N. (2020). Analysis for material selection of robot soft finger used for power grasping. In B. Deepak, D. Parhi, & P. Jena (Eds.), Innovative Product Design and Intelligent Manufacturing Systems. Springer, Newyork: Lecture Notes in Mechanical Engineering.
Alici, G. (2009). An effective modelling approach to estimate nonlinear bending behaviour of cantilever type conducting polymer actuators. Sensors and Actuators B Chemical, 141(1), 284–292.
Miron, G., Bédard, B., & Plante, J. S. (2018). Sleeved bending actuators for soft grippers: A durable solution for high force-to-weight applications. Actuators, 7(3), 1–16.
Thuruthel, T.G., Haider Abidi, S., Cianchetti, M., Laschi, C., Falotico, E. (2019). A bistable soft gripper with mechanically embedded sensing and actuation for fast closed-loop grasping arXiv:1902.04896 [cs.RO]
Lu, N., & Kim, D. H. (2013). Flexible and stretchable electronics paving the way for soft robotics. Soft Robotics, 1, 53–62.
Yildiz, S. K., Mutlu, R., & Alici, G. (2016). Fabrication and characterization of highly stretchable elastomeric strain sensors for prosthetic hand applications. Sensors Actuators A: Physical, 247, 514–521.
Amjadi, M., Kyung, K.-U., Park, I., & Sitti, M. (2016). Stretchable, skin-mountable, and wearable strain sensors and their potential applications: A review. Advanced Functional Material, 26, 1678–1698.
Emon, M. O. F., Lee, J., Choi, U. H., Kim, D., Lee, K., & Choi, J. (2019). Characterization of a soft pressure sensor on the basis of ionic liquid concentration and thickness of the piezoresistive layer. IEEE Sensor J, 19, 6076–6084.
Ohno, H. (2007). Design of ion conductive polymers based on ionic liquids. Macromolecular Symposia, 249, 551–556.
Dilibal, S., Sahin, H., & Celik, Y. (2018). Experimental and numerical analysis on the bending response of the geometrically gradient soft robotics actuator. Archives of Mechanics., 70, 1–13.
Christa, J. F., Aliheidaria, N., Amelia, A., & Potschke, P. (2017). 3D printed highly elastic strain sensors of multiwalled carbon nanotube/thermoplastic polyurethane nanocomposites. Materials and Design, 131, 394–401.
Elango, N., & Marappan, R. (2011). Analysis on the fundamental deformation effect of a robot soft finger and its contact width during power grasping. The International Journal of Advanced Manufacturing Technology, 52, 797–804.
Raja, K. V., & Malayalamurthi, R. (2011). Assessment on assorted hyper-elastic material models applied for large deformation soft finger contact problems. International Journal of Mechanics and Material Design, 7, 1–7.
Ogden, R. W., Saccomandi, G., & Sgura, I. (2004). Fitting hyperelastic models to experimental data. Computational Mechanics, 34, 484–502.
Sasso, M., Palmieri, G., Chiappini, G., & Amodio, D. (2008). Characterization of hyperelastic rubber-like materials by biaxial and uniaxial stretching tests based on optical methods. Polymer Testing, 27, 995–1004.
Systèmes, D. (2013). Abaqus Analysis User’s Manual. Providence, USA: Dassault Systèmes.
Ciocarlie, M., Miller, A., Allen, P. (2005). Grasp analysis using deformable fingers, In: IEEE/RSJ International Conference on Intelligent Robots and Systems, Edmonton, Canada 4122–4128.
Wu, Z., Li, X., & Guo, Z. (2019). A novel pneumatic soft gripper with a jointed endoskeleton structure. Chinese Journal of Mechanical Engineering, 32(1), 1–12.
Lee, J., Emon, M. O. F., Vatani, M., & Choi, J. W. (2017). Effect of degree of crosslinking and polymerization of 3D printable polymer/ionic liquid composites on performance of stretchable piezoresistive sensors. Smart Materials and Structures, 26(3), 035043.
Emon, M. O. F., Alkadi, F., Philip, D. G., Kim, D., Lee, K., & Choi, J. (2019). Multi-Material 3D printing of a soft pressure sensor. Additive Manufacturing, 28, 629–638.
Abayazid, F. F., & Ghajari, M. (2020). Material characterisation of additively manufactured elastomers at different strain rates and build orientations. Additive Manufacturing, 33, 101160.
Hohimer, C., Christ, J., Aliheidari, N., Mo, C., & Ameli, A. (2017, April). 3D printed thermoplastic polyurethane with isotropic material properties. In Behavior and Mechanics of Multifunctional Materials and Composites 2017 (Vol. 10165, p. 1016511). International Society for Optics and Photonics
The authors wish to thank Mr. T. Gulnergiz for building the data acquisition system for the fabricated soft force sensor and to Mr. C. Candas for assisting in the technical drawing.
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Dilibal, S., Sahin, H., Danquah, J.O. et al. Additively Manufactured Custom Soft Gripper with Embedded Soft Force Sensors for an Industrial Robot. Int. J. Precis. Eng. Manuf. 22, 709–718 (2021). https://doi.org/10.1007/s12541-021-00479-0
- Material extrusion
- Screen printing
- Soft robotics gripper
- Soft force sensor
- Power grasping