用两把以上的铣刀按一定尺寸装夹在一块,同时加工两个以上表面,称为组合铣削。它具有缩短工艺流程、减少零件装夹次数、工效高、质量好等特点。如图1～14所示,T、A、G、B、D为零件与刀具的基本尺寸;δt、δa、δb、δg、δd分别代表相应的偏差;△a、△b、△g、△d分别代表相应的公差。偏差应分别注成如图所示的单向偏差, With more than two milling cutter according to a certain size in a folder, while processing more than two surfaces, known as the combination of milling. It has shortened process, reduce the number of parts folder, high efficiency, good quality and so on. As shown in Fig. 1 ~ 14, T, A, G, B and D are the basic dimensions of parts and tools; δt, δa, δb, δg and δd respectively represent the corresponding deviations; △ a, △ b, △ g and △ d respectively represent the corresponding tolerances. Deviations should be noted as shown in the one-way deviation,