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US 4,442,637 AGranted
Simultaneous double-acting split abrasive wheel for peripheral sharpening of helix tools and use thereof
OwnerAlexander Ahejewinventor
Life of this patent
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Abstract
A simultaneously double-acting split abrasive grinding wheel for sharpening helix tools, such as end mill cutters, has in any embodiment thereof separate, spaced but adjacent and differently proportioned abrasive working strips therein to constitute its total peripheral surface; the wheel being adapted in its use to in single pass, one-step operation impart all at one grinding the requisite primary relief angles, secondary clearances and primary relief width spacings on the peripheral land surfaces of the tools being finished therewith.
Claims50
A double-banded, split abrasive wheel for the sharpening by abrading grind dressing of helix tools,
- said wheel being characterized in its unique adaptability and capability of accomplishing in a single, simultaneously-performable, one-pass operation to impart completely in the peripheral surface of teeth flight(s) of the tool being sharpened the appropriate desired primary relief surface both as to width and angulation from the intended cutting edge of the tool and the appropriate desired secondary clearance surface leading to the heel of the tooth profile and broken away from and more highly angulated than said primary relief surface;
- said wheel comprising as an apparatus combination:
- (a) a generally circular central support member having a round peripheral edge that is spaced from and coaxial with the central axis center line of rotation of the wheel;
- (b) a pair of constantly-layered, continuously-uninterrupted, equally- and uniformly-thick, abrasive bands split so as to be substantially disproportionate in width and mounted side-by-side on the peripheral edge of said central support member (a) and coaxial with said axial center line of said support member;
- each of the bands in said pair (b) of abrasive bands having essentially the same abrading hardness;
- so that
- (c) each of said pair of abrasive bands (b) has an exposed, continuous and integral effectively at least about equivalent grinding surface face thereon relevant to grind dressing capability;
- (d) each of said pair of abrasive bands (b) having an independently and distinct uniform width, the determining side edges of which limit the grinding face(s) (c) thereof;
- with
- (e) the grinding surface face (c) of each of said abrasive bands (b) being distendingly disposed with a lay in the same line passing generally in crossing traverse contact and running across said respective and aligned faces of both bands;
- (f) a gap of softer material including the material of said central support member (a) separating and uniformly spacing said pair of split abrasive bands (b) between one of the laterally-extending width edges (d) thereof of each of said pair in the mounted placement position of said bands about central support member (a);
- (g) the width of the first one of said bands in said pair (b) which for application of forward shank-to-nose tool feeding to be sharpened with said wheel is intended and adapted to initially contact and form the cutting edge and provide material removal for primary relief from and into the tooth projection(s) of of a helix tool being passed into contact for its sharpening by means of said wheel being relatively wider than
- (h) the width of the relatively narrower second one of said bands in said pair (b) which, also in forward tool-feeding application, is intended and adapted to immediately subsequently contact and cut secondary relief and angulation after initial action by said first band on said tooth projection(s) of said helix tool;
- and with and wherein
- the width of said wider band (g) is between about one-and-one-half-times (11/2) and about four-times (4.times.) that of said narrower band (h);
- so that as a further characterizing feature of the wheel
- the rate of wear experienced as a result of abrading grind dressing sharpening action by said abrasive wheel on a helix tool is substantially the same insofar as concerns respective thickness reductions encountered after any given period of usage in both said wider band (g) and said relatively narrower second band (g) in said pair (b) of abrasive bands in said wheel.
14 more elements
Method of single-stage, one-step sharpening of helix tools, including end mills, comprising the Step of:
- (1) taking an unground, pre-formed helix tool having a nose end and a shank end and spiral tooth flight(s) therebetween;
- (2) slowly twist-feeding said helix tool by rotating it about its center line axis of rotation and passing it longitudinally by and laterally against the aapparatus combination,
- said wheel being a double-banded, split abrasive wheel for the sharpening by abrading grind dressing of helix tools and which is characterized in its unique adaptability and capability of accomplishing in a single, simultaneously-performable, one-pass operation to impart completely in the peripheral surface of teeth flight(s) of the tool being sharpened the appropriate desired primary relief surface both as to width and angulation from the intended cutting edge of the tool and the appropriate desired secondary clearance surface leading to the heel of the tooth profile and broken away from and more highly angulated than said primary relief surface, said wheel being comprised of:
- (a) a generally circular central support member having a round peripheral edge that is spaced from and coaxial with the central axis center line of rotation of the wheel;
- (b) a pair of constantly-layered, continuously-uninterrupted, equally- and uniformly-thick, abrasive bands substantially disproportionate in width and mounted side-by-side on the peripheral edge of said central support member (a) and coaxial with said axial center line of said support member;
- (c) each of said pair of abrasive bands (b) having an exposed, continuous and integral effectively at least about equivalent grinding surface face thereon relevant to grind dressing capability;
- (d) each of said pair of abrasive bands (b) having an independently and distinct uniform width, the determining side edges of which limit the grinding face(s) (c) thereof;
- (e) the grinding face (c) of each of said abrasive band (b) distendingly disposed with a lay in the same line passing generally in crossing traverse contact over and running across said respective and aligned faces of both bands;
- (f) a gap of softer material including the material of said central support member (a) separating and uniformly spacing said pair of split abrasive bands (b) between one of the laterally-extending width edges (d) thereof of each of said pair in the mounted placement position of said bands about said central support member (a);
- (g) the width of the first one of said bands in said pair (b) which for application of forward shank-to-nose tool feeding to be sharpened with said wheel is intended and adapted to initially contact and form the cutting edge and provide material removal for primary relief from and into the tooth projection(s) of a helix tool being passed into contact for its sharpening by means of said wheel being relatively wider than
- (h) the width of the relatively narrower second one of said bands in said pair (b) which, also in forward tool-feeding application, is intended and adapted to immediately subsequently contact and cut secondary relief and angulation after initial action by said first band on said tooth projection(s) of said helix tool;
- (3) setting said wheel with respect to said tool so that its wider band (g) makes first cutting contact contact with said passing tool so as to initially excavate the greater proportion of material to be removed from the tooth profile of the tool being sharpened in order to form at least the bulk of one of the peripheral relief surfaces and associated peripheral relief angle on the tooth flight(s) of said tool;
- and so that after which in immediate subsequent sequence
- (4) said narrower band (h) setting of said wheel is such that it makes following cutting contact taking a lesser proportion of remaining tooth profile material in excavation to complete the peripheral relief surfaces and associated peripheral relief angle on said tooth flight(s);
- during which time there is carried out
- (5) rapid, power-driven, grinding rotation of said wheel;
- then
- (6) withdrawing the thereby completely dressed and finished tool from grinding contact with said wheel.
15 more elements
Dependencies are inferred from the claim text.