[雙語(yǔ)翻譯]機(jī)械加工外文翻譯--氣動(dòng)快速停止裝置在切削區(qū)振動(dòng)車(chē)削的表征（英文）

1、Full Length ArticleCharacterization of vibratory turning in cutting zone using a pneumatic quick-stop deviceSaeid Amini ?, Mohammad Lotfi, Hossein Paktinat, Mohsen KazemiyounDepartment of Manufacturing, Faculty of Mechan

2、ical Engineering, University of Kashan, Kashan, Irana r t i c l e i n f oArticle history:Received 3 November 2016Revised 2 March 2017Accepted 10 March 2017Available online 24 March 2017Keywords:Shear angleSticking length

3、UltrasonicVibratory turningQuick-stopMicro-hardnessa b s t r a c tShear angle and sticking length are two crucial parameters in mechanics of metal cutting. These twoparameters directly influence machinability factors suc

4、h as cutting forces. Thus, shear angle and stickinglength were investigated in vibratory turning process by using a pneumatic quick-stop device which wasdesigned and fabricated, in this study. After preparation of ultras

5、onic assisted turning set-up, experimen-tal tests have been carried out on two types of steel: AISI-1060 and AISI 304. Accordingly, the process ofchip formation in each particular cutting test was quickly stopped when de

6、formed chip was still in con-tact with workpiece. As a result, it was revealed that added linear vibration leads the turning operation tobe improved by increase of shear angle and decrease of sticking length. Moreover, t

7、he effect of ultrasonicvibration on cutting force and chip micro-hardness is evaluated.? 2017 Karabuk University. Publishing services by Elsevier B.V. This is an open access article under the CCBY-NC-ND license (http://c

8、reativecommons.org/licenses/by-nc-nd/4.0/).1. IntroductionChip removal process using a cutting tool is entitled machining operation. In other words, unwanted materials are cut from a raw material and the desired dimensio

9、ns are achieved. One special state of machining is orthogonal cutting process where there are two most important deformation zones named primary and sec- ondary shear zones [1–3], as shown in Fig. 1. In the primary zone

10、(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 which determines many essential aspects o

11、f the cutting mechanics such as the magnitude of the cutting force, the specific cutting energy and the finished surface. Larger shear angles pro- duce smaller cutting force, further continuous and thin chip and better s

12、urface quality [4–6]. In the secondary zone (OCD), deformed chip moves on the tool rake surface until chip separation happens [4]. According to the experimental and analytical studies carried out by [7–9] and photo-elast

13、ic analysis performed by [10,11], it is proved that there are two zones in tool-chip contact region (secondary zone), sticking and sliding, respectively.In sticking region, chip is subjected to high pressure- temperature

14、 contact (atomic contact) close to the tool tip. As usual, contact shear stress is assumed to have uniform distribution and maximum value, in this region [7,8]. High pressure near the head of cutting edge causes real and

15、 apparent contact areas to be approximately equal for some distance along the tool rake face. In this zone, the friction force is equal to the shear strength of chip. In sliding region, the remaining contact area, as ref

16、erred its name, chip has a relative motion on tool rake face, thereby pressure is dropped down leading the friction to the coulomb frictional condi- tion [1,7,8,11,12]. Since the contact condition between tool and chip i

17、s an important issue, study of this region is being one of the most important interests of researchers. Bahi et al. [13] pro- posed a hybrid analytical–numerical model to study the tool-chip interface. They also discusse

18、d the effect of cutting parameters on sticking length. Toropov and Ko [14] introduced a new method based on slip-line solution for prediction of tool-chip contact length. In another work, the effect of cutting conditions

19、 on friction coefficient and tool-chip contact length were reported by Ozlu et al. [9]. It was claimed that in high cutting speeds the tool-chip contact length is mostly sliding and sticking length can reach up to 15% of

20、 contact length for most practical cutting conditions. Besides, it has been proved that adding ultrasonic vibration to the conventional machining has positively a certain influence on machining performance such as reduci

21、ng generated cutting forces, surface roughness, and tool wear [15–17]. In this technique,http://dx.doi.org/10.1016/j.jestch.2017.03.0032215-0986/? 2017 Karabuk University. Publishing services by Elsevier B.V.This is an o

22、pen access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).? Corresponding author.E-mail address: amini.s@kashanu.ac.ir (S. Amini).Peer review under responsibility of Karabuk Uni

23、versity.Engineering Science and Technology, an International Journal 20 (2017) 403–410Contents lists available at ScienceDirectEngineering Science and Technology, an International Journaljournal homepage: www.elsevier.co

24、m/locate/jestch2.3. Experimental setupAs it is illustrated in Fig. 5(b), fabricated vibratory tool coupled with its pneumatic QSD were assembled and mounted on the sup- port of lathe machine. Experimental tests were cond

25、ucted on AISI- 1060 steel and AISI 304 stainless steel. To prepare workpieces, the tube of steels were alternatively fastened into the chuck of lathe machine. Then, the inner and outer diameter of each particular tube wa

26、s turned to 45.6 mm and 47 mm, respectively. The usual chatter vibrations existed in turning process could affect the accu- racy of the operation, since the thickness of tube is 0.7 mm. There- fore, a special fixture was

27、 utilized to solve this problems (Fig. 5(b)). A flat-faced cemented carbide insert (DCMW11T308) made by ZCC Company, was used in this study. Note that, to meet orthogonal cutting process, the insert nose has been driven

28、out from the engagement with work material during the experiments. As it is illustrated in Fig. 5(a), a multi-components dynamometer (Kistler 9257B type) was used to measure cutting forces during the tests.Fig. 2. Modal

29、analysis and the designed horn.Fig. 3. The whole vibratory tool, horn, and insert.Fig. 4. The components of designed QSD.S. Amini et al. / Engineering Science and Technology, an International Journal 20 (2017) 403–410 40