1. An assembly method of conical surface interference fit, in which the conical end of the contained part is inserted into the conical hole of the containing part to form an interference fit, which is characterized in that the following steps are included:
- Step 1: install the conical end of the contained part into the conical hole of the containing part, when the peripheral surface of the conical end and the conical hole are inside When the contact rate of the peripheral surface is not less than 80%, take a depth micrometer to measure the vertical distance h between the bottom surface of the contained part and the bottom surface of the conical hole;
- step 2: take out the contained part, and place the bottom of the containing part on the working face of a supporting beam, and work on the supporting beam The adjusting block used to support the contained part is set on the surface, and the vertical height h = H-P between the upper end face of the adjusting block and the working face of the supporting beam is H-P, where p is the target movement amount of the relative movement of the contained part and the containing part along the cone hole during interference assembly;
- step 3: put the contained part taken out in step 2 in the freezer, fill it with dry ice, and after the dry ice evaporates, Then, the conical end of the contained part is placed in a freezer containing liquid nitrogen for freezing
Where Λ 1 is the target interference of the contained part and the containing part during assembly, and the unit is mm ice
The nominal diameter of the large diameter end of the conical end of the contained part, in mm; of is the linear expansion coefficient of the material of the contained part, unit: 1 / ℃; freezing time t = k δ + 6, where k is the comprehensive cooling coefficient of the contained part, unit: Min / mm; δ is the maximum wall thickness of the conical end of the contained part, in mm;
Step 4: heat the containment part in the heating container, and heat the heating temperature of the container, where Λ 1 represents the target interference amount of the contained part and the containing part during assembly, the unit is mm; D2 is the nominal diameter of the large diameter end of the cone hole of the containing part, with the unit of_ ; 8 (12 is the thermal expansion value of the inner diameter of the large diameter end of the cone hole of the containing part, Λ D2 = 0.7 ~ 0.72mm; GC is the linear expansion coefficient of the material of the containing part, with the unit of 1 / ° C, and the unit of the ambient temperature is ° C; After heating for 4~5h, install the conical end of the contained part frozen in step 3 into the conical hole of the containing part, so that the end face of the conical end is supported on the upper end face of the adjusting block. When the temperature of the containing part and the contained part reaches the same value, the support beam is removed to complete the interference assembly.
2. The assembly method of conical surface interference fit according to claim 1, which is characterized in that: the support beam is provided with a bolt that vertically penetrates its working surface, the adjusting block is fixed on the support beam through the bolt, and a gasket is arranged between the bottom of the adjusting block and the working surface of the support beam.