China Quality parts Professional Precision machining,Precision parts processingMotor shaft, Bushings, rivets, special screws, nuts, etc.Precision partsProcessing. Products are widely used in automotive, communications, medical, watch, mobile phone, computer and other industries.
The hole and the outer circle generally have higher coaxiality requirements; the perpendicularity of the end face and the hole axis is required; the dimensional accuracy, shape accuracy and surface quality of the inner hole surface are high; the dimensional accuracy, shape accuracy and surface of the outer circle surface High quality requirements. The functions of the machines on the main surfaces of the sleeve parts are different, and their technical requirements are quite different. The main technical requirements are as follows: (1) The technical requirements of the inner hole The inner hole is the most important surface for supporting or guiding the sleeve parts, usually matched with the moving shaft, cutter or piston. The diameter tolerance class is generally IT7, and the precision bearing sleeve is IT6; the shape tolerance should generally be controlled within the aperture tolerance, and the more precise sleeve should be controlled within 1/3-1/2 of the aperture tolerance, or even smaller; In addition to the roundness requirement of the sleeve, the cylindricality of the hole should also be required. In order to ensure the use requirements of the sleeve parts, the surface roughness of the inner hole is Ra0.16-2.5mm, and some precision sleeve parts require higher, up to Ra0.63-5mm. (2) The technical requirements of the outer circle The outer surface of the outer circle often cooperates with the holes in the box or body frame by interference or transition fit to play a supporting role. Its diameter dimension tolerance class is IT6-IT7; shape tolerance should be controlled within the outer diameter tolerance; surface roughness is Ra0.63-5mm. (3) Position accuracy between major surfaces 1) The coaxiality between the inner and outer circles: if the sleeve is inserted into the hole on the machine, the finalPrecision machiningAt this time, the angle of the coaxiality of the inner and outer circles of the sleeve is required; if the sleeve is finally processed before being installed into the machine, the coaxiality is required to be high, and the tolerance is generally 0.005-0.02mm. 2) The verticality of the hole axis and the end face: If the end face of the sleeve is subjected to an axial load during work, or as a positioning reference and assembly datum, then the end face and the hole axis have higher perpendicularity or axial round runout requirements. The tolerance is generally 0.005-0.2mm.
