METHOD OF AND MILLING TOOL FOR PRELIMINARY MILLING OF RAIL HEAD PROFILE, AND MILLING CUTTERS FOR PRELIMINARY MACHINING OF RAIL HEAD PROFILE Russian patent published in 2007 - IPC E01B31/13 B23C3/00 

FIELD: metal-working industry.

SUBSTANCE: invention relates to preliminary milling of rail head profile. Proposed method of preliminary milling of rail head profile by inserted-blade cutters includes removal of bulged metal on radius part from side of nonworking face of rail head. Profile of forming surface is determined on condition that radial component of cutting force at finish milling is constantly. For this purpose tool for preliminary milling is arranged at angle to axis of symmetry of rail and at angle to direction of feed, then forming of designed profile in concave generating lines is carried out by rotating replaceable polyhedral blades with straight-line cutting edge which are arranged on tool body at angle λ to its axis. Generating surface of milling tool has straight-line generatrix, and change polyhedral blades with straight-line cutting edges are arranged on milling tool body at angle of λ>0 (in second design version, at angle of λ<0) so that at rotation of milling tool arranged at angle relative to axis of symmetry of rail and at angle to direction of feed, projection of tool generating surface on plane of normal section of rail is profile of rail head calculated on condition that radial component of cutting force at finish milling is constant. Profile of left-hand rail is formed without turning the rail at conventional milling, and profile of right-hand rail is formed at climb milling. In second and third design versions, profile of right-hand rail is formed without turning of rails at conventional milling and profile of left-hand rail is formed at climb milling.

EFFECT: reduced vibration at milling, improved quality of machined surface and increased resistance of milling tool.

4 cl, 3 dwg