tailieunhanh - Manufacturing Design, Production, Automation, and Integration Part 8

Tham khảo tài liệu 'manufacturing design, production, automation, and integration part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 8 Machining Machining refers to cutting operations that are based on the removal of material from an originally rough-shaped workpiece for example via casting or forging. Thus in the literature such operations have been often called metal cutting material removal and chip removal techniques. Herein the term machining is used as an all-encompassing term that includes the fabrication of metal as well as nonmetal parts. Machining operations are considered to be the most versatile manufacturing techniques for the production of highly accurate part geometries. They can be utilized for the fabrication of one-of-a-kind products as well as for mass production. Recently Tlusty estimated that the annual value of machining operations in the . is above 160 billion based on the existence of almost million machine tools. Machining operations can be classified according to the geometry of the object s profile rotational versus prismatic as well as to the sizes of the object features. External and internal rotational object profiles can be achieved through turning and boring operations respectively carried out on lathes and or boring machines. Prismatic profiles can be fabricated through milling operations carried out on a variety of milling machines. All these techniques would yield acceptable surface quality for the majority of the machined parts. However for higher surface finish quality there exist a variety of abrasive techniques such as grinding lapping and polishing. Copyright 2003 by Marcel Dekker Inc. All Rights Reserved. Parts with small dimensions that cannot be machined on conventional material removal machines have to be fabricated on nonconventional machines such as electrochemical electrical discharge and laser beam cutting machines Chap. 9 . As we move towards nanoscale technologies other modern technologies such as electron beam-based material removal techniques are expected to be utilized in pertinent manufacturing fields. Machine tools for material .