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将置于液氮中“冷透”的衬套取出,迅速装入包容件孔中,待衬套恢复至室温,它便牢固地配合在包容件孔内。由于冷装后衬套外圆柱面与包容件孔壁形成过盈配合,两者配合面之间存在着压力P。在P的作用下,衬套孔径会产生收缩。为此,不少工厂在冷装衬套后还需进行一道机加工或钳工修刮,以达到使装配后衬套孔径恢复到设计尺寸的目的。为了避免这道补充工序,充分提高工效,最简便的方法是修正衬套零件孔径加工尺寸的公差带。例如,设计规
The bushing, which is “cold” through the liquid nitrogen, is removed and quickly filled into the containment member hole. After the bushing is returned to room temperature, it fits securely within the containment member hole. Since the outer cylindrical surface of the cold-formed liner forms an interference fit with the wall of the containment member, pressure P exists between the mating surfaces of the two. Under the action of P, the bushing aperture will shrink. To this end, many factories in the cold lining after the need for a machining or fitter repair scratch, in order to achieve the assembly of the bushing aperture back to the design size purposes. In order to avoid this supplementary process, to fully improve the work efficiency, the easiest way is to amend the size of the bushing bore tolerance processing tolerances. For example, design rules