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某些机身结构零件(梁、接头、平尾转轴、螺栓和发动机架等),多选用30CrMnSiA及30CrMnSiNi2A钢制造。这些零件在热处理时,由于热应力和组织应力的作用,不可避免地会产生程度不同的变形,变形主要表现在当应力超过屈服极限时外形的扭曲,也有各种组织比容的差异而造成体积的胀缩。大多数结构件的外形复杂,截面变化大,厚薄相差悬殊,使变形的可能性和复杂性增大;而零件的装配协调关系复杂、配合精度要求高,往往同时提出对几个不同部位的变形要求。采用校正和放留机械加工余量的办法,不仅耗费大量的工时,有的零件仍难以满足技术要求。
Some of the fuselage structural parts (beams, fittings, flat tail shaft, bolts and engine racks, etc.), and more use of 30CrMnSiA and 30CrMnSiNi2A steel manufacturing. These parts in the heat treatment, due to thermal stress and the role of organizational stress, will inevitably produce varying degrees of deformation, deformation mainly in the stress exceeds the yield limit when the shape distortion, but also a variety of tissue specific volume caused by the difference between the volume The expansion and contraction. Most of the structural parts of the complex shape, large cross-sectional changes, the thickness difference between the disparity, the possibility of deformation and increase the complexity of the parts assembly coordination complex, with high precision, often at the same time put forward the deformation of several different parts Claim. Adopting the method of correcting and putting aside the machining allowance not only consumes a lot of man-hours, but some parts are still difficult to meet the technical requirements.