xiehe model

The structure of machined box parts is more complicated. The interior is cavity-shaped, and its processing is mainly plane and hole. The technical requirements for processing box parts should be analyzed against the technical requirements for planes and holes.

1. Plane precision requirements

The design basis for processing box parts is generally a plane. The design basis of each hole system and plane of the cabinet is the G surface, the H surface and the P surface, and the G surface and the H surface are also the assembly reference of the cabinet. Therefore, the requirements for flatness and surface precision are high.

2. Technical requirements for hole system

A series of holes with hole spacing and concentricity on the box are called holes. In order to ensure the fit between the box hole and the outer ring of the bearing and the rotation accuracy of the shaft, the dimensional accuracy of the hole is IT7, and the geometric error of the hole is controlled within the dimensional tolerance range. In order to ensure the gear meshing accuracy, the dimensional accuracy between the hole axes, the parallelism between the hole axes, the coaxiality error of each hole on the same axis, and the perpendicularity error between the end face of the hole and the axis should have higher requirements. Require.

3. Hole plane position accuracy

There should be parallelism requirements between the main hole of the cabinet and the mounting seat of the cabinet. The parallelism error between the center line of the main shaft hole of the box body and the assembly base surface (G, H surface) is 0.04mm.

4. Surface roughness

The roughness of important holes and major surfaces can affect the fit performance or contact stiffness of the joint. The surface roughness of the main hole of the box is 0.8 μm, and the surface roughness of the assembly base is 1.6 μm.