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:
The present invention relates to the rigid support of machine cutting tools. The invention provides a cutting tool, typically a shouldered end mill, and a tool holder therefore, providing rigid support while held in a machine tool spindle. The invention comprises a tool holder for removable connection to a machine tool spindle, the holder having a cylindrical bore of a first diameter terminating in an outer abutment face and configured to rigidly support a cutting tool having a substantially cylindrical shank of a second diameter slightly larger than the first diameter. The tool having a shoulder of a third diameter substantially larger than the first diameter disposed between the shank and the cutting teeth of the tool, the tool being assembled into the cylindrical bore of the tool holder when the tool holder is at a temperature substantially higher than the cylindrical shank, means being provided to apply an axial force on the cutting tool to force the tool shoulder against the outer abutment face of the tool holder.
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 multi purpose end-mill to be used for different machining purposes, in particularly useful for closed or open contours machining. The end mill comprises a cylindrical shank portion (12) connected to a first cutting portion (18) provided with a plurality of spaced apart cutting teeth and a second portion (22) provided with a plurality of different spaced apart cutting teeth.
Abstract:
The present invention relates to a rotary cutting tool consisting of a shank and at least one cutting section comprising a plurality of cutting teeth, the cutting section being conceptionaly and functionally divided into several sub-sections along the tool axis ("zones" for brevity), wherein each zone has its own core form and its own cutting edges, its own teeth land form and its own zone cutting length, these being selected according to the perceived task for which each zone of the tool is to be optimized.
Abstract:
A rounded nose end-mill (10) modified by optimization of geometrical parameters of both the rake angle (30) and relief angle (34) along the cutting edge (29) of the rounded portion (16), wherein the rake angle and the relief angle gradually increase along the cutting edge from the full diameter of the rounded portion to the tip.
Abstract:
A center or non-center cutting end mill (10, 10', 10'') for orbital drilling includes a shank (12) having a shank diameter (20); a neck (14) having a neck diameter (22); a cutting head (16) having a cutting diameter (24); a corner radius (30); a dish angle (28); and a longitudinal axis (18), the cutting head including a forward cutting end (26) having a convexly curved section (29) located between the longitudinal axis and the corner radius, wherein the convexly curved section causes material removed from a workpiece to flow radially outward from an initial contact area (31) toward the corner radius, thereby minimizing the accumulation of material in a central portion (26a) of the forward cutting end.
Abstract:
A multi-purpose end-mill to be used for different machining purposes, in particularly useful for closed or open contours machining. The end-mill comprises a cylindrical shank portion connected to a first cutting portion provided with a plurality of spaced-apart cutting teeth and a second portion provided with a plurality of different spaced-apart cutting teeth.
Abstract:
The invention relates to tools for the milling of materials The end mill of outer diameter D configured for improved rigidity comprising a body portion ( 10) to be gripped by a machine tool and a cutting portion having a plurality of flutes (30) machined to form cutting teeth (32) adjacent to said flutes the rear of each tooth comprising a short peripheral relief section (34) starting at the cutting edge and an accurate extended length tooth backing portion (38) adjoining the peripheral relief section and ending in a corner (40)
Abstract:
A cutting tap that has an elongate tap body (22) with a fluted section (30) at the axial forward end (24) thereof wherein the fluted section (30) includes a chamfered fluted section (54) and a finishing fluted section (56). Each cutting thread (58, 62, 66, 68) in the chamfered fluted section (54) has a cutting face (72, 76, 80) disposed at a cutting face angle that becomes more negative the more axially rearward the cutting thread (58, 62, 66, 68) is from the axial forward end (24) of the chamfered fluted section (54). Each cutting thread (58, 62, 66, 68) in the finishing fluted section (56) has a cutting face (72, 76, 80) disposed at a finishing cutting face angle that is essentially equal. The finishing cutting face angle is more negative than the cutting face angle for the cutting thread at the axial rearward termination of the chamfered fluted section (54).