s3正的0.02到0.05机械加工02x代表什么意思思

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机械加工质量的基本概念 机械加工精度及加工误差 工件加工后各表面的实际几何参数(尺寸、形状及相互位置)与理
想值的符合程度称为加工精度,与理想值的偏离程度称为加工误差。 加工精度和加工误差是从相反两个方面来描述工件的几何参数的,
加工精度高,则加工误差小;反正,加工误差大,则加工精度低。 加工精度及加工误差的内容包括尺寸精度(或误差)、形状精度(或误差)、位置精度(或误差)。 机械加工表面质量 表面几何学特征,指表面微观几何形状,包括表面粗糙度及波度。 表面层材质的变化,指在表面层出现的与基体材料组织不同的变质情况,包括冷作硬化、金相组织变化、残余应力。 二、获得加工精度的方法及经济加工精度 获得尺寸精度的方法 试切法――刀具相对工件的位置是通过试切、测量、调整、再试切反复进行而得到。该方法的特点是生产力低,精度取决于工人的水平,因此,适用于单件小批量生产。 调整法――工件加工前先调整好刀
具与工件在机床上的相对位置,并
在加工过程中保持该位置不变。该
方法的特点是生产力高,尺寸稳定
性好,适用于大批量生产。 定尺寸刀具法――利用刀具的尺寸来保证工件尺寸,如孔加工、槽加工等。其特点是工件尺寸精度取决于刀具尺寸精度。 自动控制法――利用测量装置、进给装置和控制系统,使工件在加工过程中自动测量、进给、补偿,从而到达要求的尺寸。该方法的特点是加工精度高,生产力高,适用于在自动化机床上加工。
获得形状精度的方法 轨迹法――利用切削运动刀具刀尖的运动轨迹以形成工件被加工表面形状。 成形法――利用成形刀具切削刃的几何形状切削出
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