Pre tightening accessories depend on the pre tightening amount after assembly to ensure a tight connection. After assembly, due to the elastic deformation of the material, pressure is generated between the mating surfaces, resulting in a large frictional force between them. During the working process, torsional or axial forces are transmitted. Interference components are usually fixed connections that cannot be disassembled. Interference assembly methods include: (1) manual stamping method, (2) pressing method, (3) cold assembly method, and (4) hot assembly method.

1、 Pre assembled parts inspectionBefore reassembly, it is necessary to recheck the preloaded parts and keep records.

(1) The interference amount must comply with the requirements of the drawings or technical documents.

(2) The end face of the corresponding wheel or ring in contact with the axle shoulder, with the green end face of the wheel as the assembly reference, must deviate from the perpendicularity of the hole within the indicated range as shown in the figure.

(3) Appropriate rounded bottoms, chamfers, etc. should not affect assembly.

(4) The appropriate surface level may have spikes, rust spots, or scratches.

(5) When the mother part hole is blind, it must have ventilation holes or grooves, otherwise it cannot be assembled.

(6) Key controlled accessories must be rechecked for shaft slots, hole slots, and the position of the key to be inspected before assembly. Only after the inspection is correct can assembly be carried out.