SLEEVES

Chevin can design an Expanding Mandrel system to suit your exact production requirements. Listed below is a selection of the common sleeves and other clamping methods to support the component on the mandrel. These can be combined with most actuation and mounting methods to produce a complete mandrel to your specification.
Standard sleeves : Standard sleeves are made of high quality steels, hardened and ground to precision limits. Sleeves from Ø 0.5’’ to Ø 20’’ can be produced and accuracies of 0.0002’’ T.I.R achieved at nominal size.
Segment Jaw type : Where the component has an irregular bore, for instance from a casting, that is unsuitable for a standard sleeve, segmented jaws can be used. Jaws can be plain or serrated and are normally operated by wedges and collapsed by springs. This allows generous bore tolerances to be specified on the component to be machined.
Flexiring type : For very thin walled components where wall distortions are a problem, the Flexiring type can be used. These provide a secure grip of the component, whilst still allowing the part to keep its natural shape. The flexible gripping rings exert equal radial force all round and do not mark the bore in any way. Out-of-roundness of at least 0.02’’ can be accommodated in bores of Ø 1.0’’ upwards.
Hydraulic type: An expanding sleeve with an unbroken surface can be used to hold in a bore where the surface finish is critical. There are other instances where a mechanical mandrel is undesirable or unworkable. The hydraulic type of expanding sleeve relies on the thin wall of the sleeve itself stretching under hydraulic pressure. Expansion is limited so the application must be right. These mandrels are usually actuated by an integral screw piston, although direct connection to a pressure supply is possible.
Other holding methods can be customised to your exact needs. Chevin Tools Inc have over 50 years experience and can design a solution for almost any problem.