1、中文 2650 字 毕业设计英文翻译 课 题 名 称： 学 生 姓 名： 指 导 教 师： 所 在 系 部： 专 业 名 称： Five-Face Machining Center To Boost Productivity of Large Parts Hideo Tamon Manager Machining Section , Manufacturing Dept 1.Introduction Meeting increasingly diverse machining needs and making effective use of a limited supply of perso
2、nnel and available space are among the most important goals for machine tool manufacturers , and key considerations in finding ways to achieve them are “productivity” and “accuracy.” To achieve higher machining accuracy and productivity, SNKs Shinodayama Work has been continuing to modernize its pro
3、duction facilities and improve the production environment. As of the early 1960s,there were a total of 310 machine tools at Shinedayama Works, but the have now been replaced by only 70 highly productive machines. Guided consistently by top managements philosophy centered on “pursuit of automation ”
4、and “functional improvement,” Shinodayama Works has been working to increase productivity and rationalize its facilities. During the process, a single action that was most instrumental in increasing productivity was the introduction of machine tools designed to machine five faces (sides) of the work
5、 piece in one setup. Over the period of ten years from 1990 all factory buildings were modified into temperature-controlled factories so as to ensure the consistent accuracy of the machining and the assembly (including unit assembly) processes by stabilizing machine and work piece accuracy. As a res
6、ult, the machining capacity of Shinodayama Works became larger than necessary to machine large parts to be used in SNK products； it became large enough to machine other parts under contract for other companies. This article will introduce to the readers the advantages of the five-face machining cent
7、er in terms of productivity. These advantages will be demonstrated in a discussion of the machining of a turbine casing of a large generator, which is of a cylindrical assembly of complex configuration. The turbine casing is machined with SNKs newly developed HF-8M Multi-Center, a large, high-perfor
8、mance, precision five-face machining center installed at Shinodayama Works. 2.Configuration of the Work piece (Turbine Casing) As shown in figure 1,the turbine casing to be machine on the HF-8M is of split cylinder configuration. The dimensions of the turbine casing are also shown in Figure 1.The ca
9、sing is made of steel and weighs about 70 tons. The machining processes of this work piece can be summarized as follows: Process A: Machining of mating surfaces and drilling of screw and bolt holes. Process B: Machining of outside flange surfaces and drilling of holes Process C: ID machining Process
10、 D: Machining of flange surface and drilling of fastening screw holes 3.Comparison Between Five-face Machining and Conventional Machining For the processes A to D mentioned in Section 2, the machine tools required for the machining method using a five-face machining center and the machining method u
11、sing conventional machine tools were compared (Table 1). As shown in the table, use of a five-face machining center is advantageous in terms of production control and work piece machining accuracy because the movement of the work piece from machine to machine and setup changes (including alignment)
12、that would be required for different machines in the conventional machining method can be minimized by using a five-face machining center. 4.Function of HF-8M Multi-Center Capable of Performing All Machining Operations This section describes the functions and characteristics of the HF-8M that is cap
13、able of performing all machining operations for a turbine casing, along with some newly devised machining methods. 1) Using various attachments and automation devices The HF-8M at SNK is equipped with a seven-attachment automatic attachment changer (ACC) (Photo) and a 100-tool automatic too changer
14、(ATC). By allowing the machine to change attachments and cutting tools automatically as necessary, the range of machining operations that can be carried out in one setup can be expanded, and efficiency improvement and automation can be achieve. The machining of the turbine casing required four types
15、 of attachments including a newly developed attachment: Angular attachment Extension attachment Universal attachment (with a calibration system) Side cutter attachment (newly developed) 2) Universal attachment + arbitrary-plane machining function As shown in Figure 1, the work piece has many flange
16、surfaces and holes protruding beyond the outside surface of the casing. They are arranged radically from the central axis of the casing, are inclined from the axis direction and are off the radial axes. The conventional machining method is to use an inclined attachment mounted on a horizontal machin
17、ing center while the work piece is rotated and positioned on a rotary table. With the HF-8M, a universal attachment (with a calibration system) was used in combination with the arbitrary-plane machining function (Photo 3) The arbitrary-plane machining function allows arbitrary program coordinate axes
