In the development of horizontal machining centers, the common X, Y, and Z axes with the spindle have been difficult to meet the requirements of modern processing. In the hydraulic and pneumatic, engineering machinery, petrochemical equipment, automobiles, rolling stock, power equipment and other industries, the main body of the bridge body, differential housing, pump body and valve body parts are the main processing objects. Features, often more than Rc2 taper pipe thread processing; pump body and valve body combined end face often has curved or special-shaped sealing groove, its sealing requirements are very high; a large number of coaxial holes with different diameters make the processing of such parts It is difficult to realize in an ordinary horizontal machining center, and it is necessary to have a B-axis, a U-axis, a W-axis and the like to realize a composite machining.
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