1、3900 英文单词， 2 万英文字符 ， 中文 6400 字 文献出处： Amini S , Lotfi M , Paktinat H , et al. Characterization of vibratory turning in cutting zone using a pneumatic quick-stop deviceJ. Engineering Science and Technology, an International Journal, 2017, 20(2):403-410. Characterization of vibratory turning in cutting
2、 zone using a pneumatic quick-stop device Saeid Amini, Mohammad Lotfi, Hossein Paktinat, Mohsen Kazemiyoun Abstract Shear angle and sticking length are two crucial parameters in mechanics of metal cutting. These two parameters directly influence machinability factors such as cutting forces. Thus, sh
3、ear angle and sticking length were investigated in vibratory turning process by using a pneumatic quick-stop device which was designed and fabricated, in this study. After preparation of ultrasonic assisted turning set-up, experimental tests have been carried out on two types of steel: AISI-1060 and
4、 AISI 304. Accordingly, the process of chip formation in each particular cutting test was quickly stopped when deformed chip was still in contact with workpiece. As a result, it was revealed that added linear vibration leads the turning operation to be improved by increase of shear angle and decreas
5、e of sticking length. Moreover, the effect of ultrasonic vibration on cutting force and chip micro-hardness is evaluated. Keywords: Shear angle; Sticking length; Ultrasonic; Vibratory turning; Quick-stop; Micro-hardness 1. Introduction Chip removal process using a cutting tool is entitled machining
6、operation. In other words, unwanted materials are cut from a raw material and the desired dimensions are achieved. One special state of machining is orthogonal cutting process where there are two most important deformation zones named primary and secondary shear zones 13, as shown in Fig. 1. In the primary zone (ABCO), by advancing of cutting edge into the workpiece, chip is formed under a shear angle (u). The angle at which the chip is separated from the workpiece is called shear angle
