For three-jaw chucking, the sleeve part can be processed once to complete the inner and outer circle end faces, chamfering, and cutting. Due to the error in centering accuracy of the jaw chucks, it is not suitable for secondary clamping of workpieces with high coaxiality requirements. For different parts of the structure, it is not possible to use a process scheme to ensure its accuracy requirements.Īccording to the structural features of the sleeve part, three-jaw chucks, four-jaw chucks, or face plate clamping can be used in CNC machining. Sleeve part inside and outside the circle, the end surface and the reference axis have a certain degree of accuracy requirements, the outline part of the fine reference can choose the outer circle, but often with the center line and an end face for the finishing reference. the hole diameter tolerance grade is generally IT7, the precision bushing may take IT6, and the hole shape accuracy shall be controlled within the aperture tolerance.įor longer-length bushing parts, in addition to the roundness requirements, attention should be paid to the cylindricity of the inner hole face, the round runout and verticality of the inner hole axis of the end face, and the parallelism of both end faces.

Sleeve part is machined common form of processing, In addition to the size and shape accuracy of the sleeve part, the inner hole is generally used as a reference for assembly. The heat treatment: modulation treatment, HRC25-35 has no hardness requirements. 45 steel, and the machining and cutting performance is good. The contour description is clear and complete the material of the part is No. The figure shows a simple sleeve part, in which a plurality of diameter dimensions and axial dimensions have higher dimensional accuracy and surface roughness requirements, and the dimension of the part is marked in a complete manner, which meets the requirements for the dimensioning of the NC machining

Program mesin bubut cnc