Generally speaking, the structure of the box parts is complicated, and the inside is cavity shape. The machining is mainly plane and hole. The technical requirements of box parts should be analyzed according to the technical requirements of plane and hole.
The precision of the 1. plane requires that the design datum of the box parts are generally flat. The design datum of each hole system and the plane are G, H and P, in which the G surface and H face are the assembly datum of the box, so it has higher flatness and smaller surface roughness requirements.
The 2. hole system requires a series of holes with holes spacing and coaxality requirements on the box, which is called the hole system. In order to ensure the fit of the box hole and the outer ring of the bearing and the rotation accuracy of the shaft, the size accuracy of the hole is IT7, and the geometric error of the hole is controlled within the tolerance range. In order to ensure the gear meshing accuracy, the dimension accuracy between the axis of the hole, the parallelism between the axis of the hole, the coaxiality error of each hole on the same axis and the Perpendicularity Error of the hole end to the axis, all should have high requirements.
The position accuracy between the 3. holes and the plane should be specified between the main holes on the box and the installation base of the box. The parallelism error of the center line of the spindle hole of the box part to the assembly base plane (G, H surface) is 0.04mm.
4. the roughness of the important surface roughness and the main surface will affect the joint properties or contact stiffness. The surface roughness of the main hole of this box is 0.8 m, and the surface roughness of the assembly base surface is 1.6 u m.
标签:   钣金加工 钣金 加工