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Applications of mechanical systems and technology
Published in Alan Darbyshire, Charles Gibson, Mechanical Engineering, 2023
Alan Darbyshire, Charles Gibson
Bolts can be obtained with different lengths of thread for different applications. Bolts for general use are forged to shape and are generally known as black bolts. For applications where precision is required, fitted bolts can be obtained that have been accurately machined to size. Bolts made from high-tensile steel are also supplied for heavy-duty applications. Nuts and bolts are made from steel, brass, aluminium alloys and plastics. Steel nuts and bolts are sometimes cadmium plated to improve their resistance to corrosion.
Methods of joining
Published in Andrew Livesey, Alan Robinson, The Repair of Vehicle Bodies, 2018
A nut is a shaped block of metal internally cut to form a thread. It is usually made from mild steel, although other metals and alloys can be used for special purposes. Common nuts are: Hexagonal plain nut – Used in all classes of engineering.Square nut – Used in heavy engineering and structural work and also in coach building.Castellated nut and slotted nut – Used where the nut must always remain tight and slotted to take split pins which act as a locking device. Lock nuts – These are thinner than the normal nut and are fitted above the main nut to act as a locking device.
Materials
Published in John H. Bickford, An Introduction to the Design and Bchavior of Bolted Joints, 2018
Most designers and users focus on the strength and other characteristics of the bolt or stud. Having selected a bolt, they then want to choose an appropriate nut, or design a suitable tapped hole. As far as tapped holes are concerned, you can use the thread strength equations of Chap. 3 to select such things as length of thread engagement. When it comes to nuts, most designers will use those recommended in the pertinent bolt specification they’re using—or in the nut standard to which the bolt standard refers.
Anti-loosening mechanism of pitch difference bolt nut connections based on Junker loosening test
Published in Mechanics Based Design of Structures and Machines, 2022
Nao-Aki Noda, Biao Wang, Yoshikazu Sano, Ryo Kawano, Yuto Inui, Xi Liu, Yasushi Takase
There are mainly two methods widely used for preventing nut loosening. One is to use special washers, and the other is to change the shape of the nuts (Bhattacharya, Sen, and Das 2010; Gong, Liu, and Feng 2022; Panja and Das 2016, 2017; Samanta et al. 2012). Sawa et al. conducted a series of Junker loosening experiments by varying washers with M12 nut shapes (Sawa, Ishimura, and Yamanaka 2006; Shoji, Sawa, and Yamanaka 2007). It was found that loosening prevention performance was improved by using plate washers, spring washers, toothed washers, and Nord lock washers compared to normal bolt-nut connections without them. Like a washer, a flange nut has a wide flange surface at the bearing nut side, usually with a serrated shape, which contributes to anti-loosening. It was reported that 110 percent of the tightening torque is required to loosen the flange nut (Barrett 1990). Flange nuts are mainly used for wood and plastic. Slotted nut, also known as Castle Nut, has some slots on the free nut end side, and they are usually used together with a pin. This type of nuts is suitable for situations when the initial tightening torque needed is small (Barrett 1990). Super lock nut (SLN) is a kind of wire inserted nut and is widely used in industries such as transportation and bridges provided by Fuji Seimitsu Co. Different from the common nut, this type of nut can be reused several times. Since a spring is inserted in the thread, the loosening energy can be absorbed and transferred to a locking torque when vibrating the bolted joints.
Team O2AS' approach for the task-board task of the World Robot Challenge 2018
Published in Advanced Robotics, 2020
Kaidi Nie, Felix von Drigalski, Joshua C. Triyonoputro, Chisato Nakashima, Yoshiya Shibata, Yoshinori Konishi, Yoshihisa Ijiri, Taku Yoshioka, Yukiyasu Domae, Toshio Ueshiba, Ryuichi Takase, Xinyi Zhang, Damien Petit, Ixchel G. Ramirez-Alpizar, Weiwei Wan, Kensuke Harada
Difficulties The picking, arrangement and alignment of the M6 bolt and nut. The screwing task between the nut and the bolt.Requirementsbbot with the Robotiq grippercbot with the Robotiq gripperabot with the precision gripperThe M6 screw toolThe M6 nut tool