Maintenance instructions for flange couplings

　　Flange couplingIt is a coupling with a very simple structure, which is mainly composed of two halves of the coupling and connecting bolts. The main processing procedures of the flange coupling include boring, cutting and keyway trimming before assembly of the coupling sleeve hole , Machining of the end face of the coupling and other surfaces, etc.The shaft sleeve hole of the semi-coupling has two forms: a conical hole and a cylindrical hole. The conical hole has more advantages in the process characteristics than the cylindrical hole.The conical shaft sleeve hole is easy to obtain the concentricity between the mating parts, the contact between the coupling and the shaft mating surface can achieve a better fit, and the inspection is more convenient, so the use of conical holes is more common.The semi-couplings are generally made of forgings, leaving a margin of 2-3mm on each side during rough machining, and the boring process can only be carried out with heat treatment to eliminate residual stress.The boring of the coupling is usually carried out on a lathe, because the machining of the coupling sleeve hole is very demanding, so the finishing of the hole is usually done by grinding.The finish machining of the outer surface of the coupling is carried out in the same clamping as the boring.The size of the processed hole and the contact between the hole and the shaft mating surface need to be inspected. For mass-produced couplings, generally taper sample columns can be used to ensure the interchangeability of parts.Single-piece couplings can be inspected by fitting the coupling on the shaft end.If the fit between the shaft and the hole does not meet the requirements, the hole of the coupling can be repaired.
　　After boring and passing the inspection, the keyway of the coupling can be processed, and the processing is carried out on the slotting machine.A margin of 0.1mm should be left on each side of the coupling for correction after fitter. This is mainly to ensure that the processed keyway wall can be parallel to the center line of the hole.The couplings produced in batches are generally scraped with a special model as the standard, and the special model is used for inspection. Single-piece couplings can be assembled and trimmed to achieve accurate matching dimensions.