迹字石油化工大學⊙ Instructional objectives At the end of this lesson the student would be able to (1). Understand the basic concept of machining accuracy, machining error and machining economic accuracy etc (2). Master the error of machine tool and adjustment error, understand the influence of stress and deformation on machining accuracy of process system, machining error caused by thermal deformation of process system (3 ) understand the deformation caused by internal stress, and understand the ways to ensure and improve machining accuracy and the method of obtaining machining accuracy for partsInstructional objectives At the end of this lesson, the student would be able to : (1).Understand the basic concept of machining accuracy, machining error and machining economic accuracy etc. (2).Master the error of machine tool and adjustment error, understand the influence of stress and deformation on machining accuracy of process system, machining error caused by thermal deformation of process system,. (3).understand the deformation caused by internal stress, and understand the ways to ensure and improve machining accuracy.and the method of obtaining machining accuracy for parts