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結果 (英文) 1:

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結果 (英文) 3:

Are used to shape Machine-tools metals and other materials. Material to be shaped The is called the workpiece. Machine-tools are now electrically driven. Most Machine-tools with electrical drive are faster and more accurate than hand tools: they were an important element in the development of mass-production processes, as they allowed individual parts to be made in large numbers so as to be interchangeable.Machine-tools have All facilities for holding both the workpiece and the tool and for accurately controlling the movement of the cutting tool relative to the workpiece. Machining operations Most generate large amounts of heat and use cooling fluids usually a mixture of water and oils cooling for and lubrication.Usually work materials Machine-tools mechanically but other machining methods have been developed lately. Include chemical machining spark They to erosion machine very hard materials to any shape by means of a continuous high-voltage spark discharge between an electrode and a workpiece.. Machining methods include drilling using Other ultrasound and by cutting means of a laser beam. Control Numerical of machine-tools and flexible manufacturing systems have made it possible for complete systems of machine-tools to be used flexibly for the manufacture of of products. a range