Abstract:
A chatter-resistant end mill (10) and a method of making such an end mill, in which the teeth (18) of the end milt are unequally spaced apart to substantially reduce or eliminate vibrations produced during cutting of a work piece.
Abstract:
An end mill is provided that includes a shank section and a fluted section. One or more helical teeth (26) are disposed along an outer surface of the fluted section. Each helical tooth has a cutting surface and a relief wall that intersect to form an angle defining a helical cutting edge (32). The cutting surface of each helical tooth includes a first section (36), a second section (38), and a take-off peak (40) disposed between the first section and second section. The cutting edge of each helical tooth includes a first portion having a first constant angle, and a second portion having a second constant angle unequal to the first constant angle, and an arcuate transition section connecting the first portion and second portion. Some embodiments of the present invention include more portions than the aforesaid first and second portions.
Abstract:
The invention relates to a tools for the milling of materials. The invention provides improved torsional and bending rigidity of tool's body in an end-mill, thereby to extend tool life while making possible machining at increased metal removal rates, and better surfase quolity, whill preventing vibration. The end mill of outer diameter D configured for improved rigidity, comprising a body portion to be gripped by a machine tool and a cutting portion having a plurality of flutes machined to form cutting teeth adjacent to said flutes, the rear of each tooth comprising a short peripheral relief section starting at the cutting edge, and an arcuate extended-length tooth backing portion adjoining the peripheral relief section and ending in a corner formed between the extended length tooth backing portion and the flute, the corner being spaced from the outer diameter D by a distance C, the value of C being in the range 0 to 0.20D.
Abstract:
A cutter system (10) that is designed to create a continuous cutting true helix while having cutting inserts (14) that are indexable on at least two cutting edges (66 and 68) by rotating the cutting insert. High positive radial and axial rakes enable free cutting machining with a fine finish and low horsepower consumption. The back face (40) of the insert (14) is substantially flat and is used for face contact on lockup with a mounting pocket (34) on the cutter body (12) when the insert screw is tightened. The mounting pocket (34) is designed for ease of manufacture to limit tolerance buildup to ensure repeatable insert (14) positioning and to maintain accuracy for a fine cutting finish. The insert screw hole (46) is placed in the cross hole location for allowing an unobstructed cutting face and a larger diameter center core in the cutter body (12). The larger core creates maximum strength and allows longer cutting lengths. Prior to grinding, the insert blank can be used for multiple diameters of cutters. After grinding the insert blank, the inserts are made specific to the cutting diameter for which they were ground or a compromised grind may be employed for use with multiple cutting diameters.
Abstract:
A cutting tool system (140) is designed to have a combined sinusoidal-shaped and helical- shaped cutting edge formed by an assembly of aligned common cutting inserts (147c, 147b, 147d) each having a sinusoidal and helical cutting edge.
Abstract:
Die Erfindung betrifft einen Walzenfräser mit einer oder mehreren schraubenförmig verlaufenden Schneiden für die Bearbeitung von Holz, Holzwerkstoffen und Kunststoff sowie ein Verfahren zu seiner Herstellung. Das erfindungsgemäße Werkzeug hat einen Werkzeug-Neigungswinkel λ s der Schneiden im Bereich von 70° bis nahe 90°, insbesondere bei 80° bis 88°, und einen Spanwinkel γ r zwischen der Werkzeug-Orthogonalebene P o und der Spanfläche A y , gemessen in der Werkzeug-Bezugsebene P r , von wenigstens 5°. Bei dem Werkzeug besteht ein wesentlicher Unterschied zwischen den Wirkwinkeln und den angeschliffenen Orthogonalwinkeln. Die Späne werden überwiegend axial abgeschält und abgeführt. Die Späne sind langfasrig und können (als Nebenprodukt) in der Zellstoffindustrie verarbeitet werden. Es werden annähernd konstante Schnittkraftverhältnisse erreicht. Die Oberflächengüte der bearbeiteten Hölzer ist sehr gut. Bei der erfindungsgemäßen Herstellung wird entweder die Schneide getrennt vom späteren Werkzeuggrundkörper hergestellt und in diesen formschlüssig eingefügt oder es wird auf einen zylindrischen Grundkörper aus einem Trägermaterial eine Schneide aus Schneidenmaterial schraubenförmig aufgetragen und nachfolgend zu der gewünschten Schneidenform geschliffen.
Abstract:
A cutting tool (10) for cutting a workpiece comprising a tool body (12) having an outer surface thereon and a central axis (CA) therein and including at least a first and second spiraling flute (22, 24) in the outer surface, each flute (22, 24) including a plurality of inserts (38) secured therein to define an axial rake angle, wherein the axial rake angle alpha nm, beta nm and gamma nm), of the inserts (38) varies between flutes and within each flute.
Abstract:
An improved end milling tool effective to reduce forces produced in ramp cutting comprises a plurality of end cutting edges (20, 22, 24), and a plurality of side cutting eddges (32, 34, 36), each end cutting edge lying parallel to a radius of the tool tip (18) and intersecting a side cutting edge at the periphery of the tool tip, and each end cutting edge comprising a peripheral end edge portion and an interior edge portion (70), the peripheral end edge portion sloping relatively shallowly from the tip periphery towards the shank portion (14) of the tool, and the interior edge (72) portion sloping relatively steeply from the peripheral edge portion towards the shank portion.