金屬結(jié)合劑金剛石砂輪的精密內(nèi)圓磨削外文翻譯

1、畢業(yè)設(shè)計(jì)外文資料翻譯 畢業(yè)設(shè)計(jì)外文資料翻譯題 目 金屬結(jié)合劑金剛石砂輪的精密 內(nèi)圓磨削 學(xué) 院 機(jī)械工程學(xué)院 專 業(yè) 機(jī)械工程及自動(dòng)化 班 級(jí) 機(jī)升 0901 學(xué) 生 學(xué) 號(hào)

2、 指導(dǎo)教師 指導(dǎo)教師 二〇一一 年 四 月 十 日濟(jì)南大學(xué)畢業(yè)設(shè)計(jì)外文資料翻譯- 2 -to a desired form under high pressure and then sintered in an atmosphere of ammonia. These wheels are not suitabl

3、e for continuous grinding for a long period of time for the following reasons: (1) As tougher metal-bonded wheels exhibit poor dressing ability, it is difficult to achieve efficient and stable dressing simultaneously. (2

4、) Higher rate of material removal in the grinding promotes wear of the abrasive grains, therefore, more frequent redressing of the grinding wheel will be required by stopping the grinding process. (3) While machining met

5、als such as steel, wheel loading (embedding of swarf) occurs, making effective dressing of metallic bond wheel difficult in practice. Although a diamond slab incorporated with an abrasive jet sharpening method is able to

6、 dress a bronze-bonded wheel to the same topography as an electroplated wheel [12], complex equipment must be added inevitably which cause working-environment problem. Dressing by electrical discharge is a good method, b

7、ut it is difficult to conduct on-line dressing, and dressing stripes appear on the wheel periphery when a pair of parallel electrodes is used [13,14]. Electrolytic in-process dressing (ELID) has so far served as the most

8、 successful dressing method for metal-bonded wheels. It has been devised and applied successfully in precision surface grinding [15-17]. However, its application to internal grinding has not been well investigated; espec

9、ially when the internal diameter of the workpiece is just slightly larger than that of the grinding wheel, it is very difficult or even impossible to fix a dressing electrode mounted parallel to the wheel surface as in o

10、rdinary ELID grinding [15]. A novel method to carry out ELID grinding of internal cylindrical surfaces on an ordinary grinding tool is presented in this paper. The principle and process of this method, namely interval EL

11、ID (ELID II) grinding, is also discussed. Applying ELID II grinding to an ordinary grinding machine, some preliminary experiments have been carried out. Two types of dressing electrodes were used and their dressing effec

12、ts were investigated. With this technology, four specimens of alumina ceramic, hardened steels SKH51 and SKD11 and bearing steel, were ground to mirror finish. The results of this research are presented in the following

13、sections.2. Principle of interval ELID grindingThe interval dressing of an abrasive grinding wheel itself is not a new technology. In fact, using the common mechanical dressing methods, the wheel is usually dressed at in

14、tervals. The grinding process is stopped to dress the wheel after grinding one workpiece or several work pieces. The tool life limit can be chatter vibration, surface roughness and burning marks, etc. [2]. However, with

15、the ELID II method, the wheel is dressed at intervals and the abrasives remain protruding, enabling the grinding process to go on without any interruption and consequently realizing high efficiency grinding.The interval

16、ELID system is essentially composed of thefollowing elements: (i) a metal-bonded grinding wheel, (ii)an ELID power source, (iii) electrolytic coolant, and (iv) a pipe dressing electrode. The most important feature of thi