制图标准中剖切面后结构画法的探讨

针对机械制图标准中有关旋转剖视图画法的规定，围绕剖视图中剖切面后 结构的画法，提出了“剖切面后的其他结构”和“剖切结构及其有关部分”的具体界限，当一些 结构没有直接被剖切到时，若它所在的形体的轴线为两剖切面的交线，应按剖切面后的其他 结构，按原来的位置投射；否则应按照“剖切结构及其有关部分”，随其所在结构旋转到新的 位置，使画法进一步明确。针对有些学者建议，删去制图标准中“剖切面后面的其他结构， 应按原位置投射”的规定，认为不能删去，并证明了自己的观点。

The drawing method for structure of a part after cutting plane

Based on the drawing method of structure of a part after a cutting pane in cutaway view in mechanical drawing standard, the specific definition of “other structures after the cutting plane” and “Sectioning structure and its related parts” is established. If the axis of physique which it belongs to is intersection of two section cutting plane when some structures have not been split cut, it is the other structures after the cutting plane, and it should be projected according to the original position. Otherwise, it is the sectioning structure and its related parts, and should be rotated to a new location with his structure. This paper also describes with proven that it should not delete “the other structures behind a cutting plane are projected according to the original location” in mechanical drawing standard.