Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
  • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
  • B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
  • B23B27/145—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness characterised by having a special shape
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2200/00—Details of cutting inserts
  • B23B2200/04—Overall shape
  • B23B2200/0404—Hexagonal
  • B23B2200/0419—Hexagonal trigonal
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2200/00—Details of cutting inserts
  • B23B2200/20—Top or side views of the cutting edge
  • B23B2200/201—Details of the nose radius and immediately surrounding area
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T407/00—Cutters, for shaping
  • Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T408/00—Cutting by use of rotating axially moving tool
  • Y10T408/86—Tool-support with means to permit positioning of the Tool relative to support
  • Y10T408/865—Pivotable Tool
  • Y10T408/868—Pivotable Tool with multiple cutting positions
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T408/00—Cutting by use of rotating axially moving tool
  • Y10T408/89—Tool or Tool with support
  • Y10T408/909—Having peripherally spaced cutting edges

Definitions

• the invention relates to a cutting insert for tools rotating about a tool axis, in particular for multi-edged drilling tools, with a main cutting edge and one in its extension radially outwards over a cutting edge corner at an angle to this secondary cutting edge, with one on one long side to the main cutting edge and the Sub-cutting edge adjoining common rake face and with one on the other long side adjoining the main cutting edge or the sub-cutting edge, with the common rake face each including a wedge angle including a main wedge angle or secondary clearance surface.
• a secondary cutting edge designed as a leading edge is provided there and is guided along the drilled wall.
• the guiding edge is usually provided with a round grinding, the radius of curvature of which is smaller than the radius of the bore. This means that the leading edge is guided along a line on the bore wall. If the radius is too small, the guidance will be relatively poor. The tool rattles because it traps or cuts into the hole wall with the leading edge.
• there is surface contact which increases the proportion of friction of the tool in the bore and can lead to overloading of the machine and / or the tools.
• the object of the invention is to improve the cutting insert of the type specified at the outset in such a way that there is an optimal supporting effect with minimal friction in the region of the secondary cutting edge.
• the solution according to the invention is based on the idea that a support chamfer is arranged in the area of the secondary cutting edge, which is delimited by two support edges arranged at a distance from one another in the direction of rotation of the tool, which have the same radius distance over their entire length, which at the same time forms the radius of the tool the tool axis.
• the support edges in their longitudinal extent expediently run parallel to the tool axis, while the support chamfer located between the support edges is preferably designed as a flat surface.
• the support chamfer advantageously has a length which corresponds to at least twice the distance between the support edges.
• the support edges should be spaced 0.1 to 1.5 mm apart, depending on the bore diameter.
• the support chamfer between the support edges advantageously extends over a fraction of the insert thickness. In its longitudinal extension, the support chamfer extends to the rounded or faceted cutting corner, if applicable.
• the support edges can be rounded or preferably faceted tangentially to the tool flight circle.
• a preferred embodiment of the invention provides that the main cutting edge and the secondary cutting edge designed as a supporting bevel enclose a right angle with one another in their longitudinal extent.
• the cutting insert according to the invention can be designed both as an interchangeable cutting insert with only one cutting corner and as a transfer cutting insert with several cutting corners.
• the cutting insert is advantageously designed as a trigon insert with three main cutting edges having a roof shape with a tip angle of 140 to 170 °, the supporting chamfer belonging to a main cutting edge being molded into the corner region of a main cutting edge adjacent in a defined transfer direction.
• the measures according to the invention are suitable both for use in solid drills as well as in bores and reamers, and preferably in long-protruding and multi-bladed tools.
• the low-friction support and guidance in the bore reduces the tendency of the drilling tool to vibrate.
• Fig. 1 is a diagrammatic representation of a double-edged
• FIG. 4 shows an enlarged detail of a side view of the indexable insert with a support chamfer in a schematic representation within the drill geometry.
• the drilling tool shown in the drawing is designed as a double-edged drill.
• the drilling tool is intended for use in machine tools and for this purpose has a coupling shaft 12, delimited by a coupling flange 10 for a flat surface system, for connection to a machine spindle, not shown.
• An elongated base body 14 is also connected to the coupling flange 10 and is provided in the region of its front end with two plate seats 16, from which chip removal grooves 18 extend over the length of the base body 14.
• two identical trigon indexable inserts 20 are interchangeably arranged and fastened to the base body 14 with fastening screws 22.
• the fastening screws are screwed into the base body 14 essentially perpendicular to the drill axis 24 from the chip conveying grooves.
• Each of the cutting plates has three main cutting edges 26, one of which is effective when installed.
• the main cutting edges 26 have a roof-shaped tip 28, one leg 26 'of the main cutting edge extending straight from the tip 28 to the cutting corner 30 and the other leg 26 "toward the other cutting corner 30 having a further obtuse-angled bend 32 roof-shaped tip 28 and the obtuse angle in the region of the bend 32 are dimensioned such that an angle of 70 ° to 110 °, preferably 90 °, results between the main cutting edge leg 26 'and the adjacent bend 32.
• the respective main cutting edge leg 26' In the installed state, a bend 32 adjacent to the cutting corner 30 forms a minor cutting edge, to which a guide and support chamfer 34 for supporting the tool on the bore wall 36 (FIG. 4) is connected.
• the cutting insert also has a rake face 38 opening into the chip conveying groove 18 and a rake which forms a cutting wedge with the rake face Main open area 40.
• the secondary cutting edge 32 is delimited on its one long side by the common rake face 38, while on the other side of the supporting chamfer 34 there is a secondary free face 42.
• the support chamfer 34 is delimited by two support edges 44, 46 which are arranged at a distance s from one another in the direction of rotation 43 of the tool and have the same radius distance r or r 2 from the tool axis 24 over their entire length, which corresponds to the tool's radius of the flight circle. As can be seen from FIG. 2 in connection with FIG. 4, the support edges 44, 46 run parallel to the tool axis 24, but in the exemplary embodiment shown are of different lengths with regard to the additional triangular chamfer 48.
• the support chamfer 34 as such is designed here as a flat surface parallel to the tool axis 24 (cf. FIGS. 3c and 4).
• the tool can be supported with little friction on the bore wall 36 during the drilling process via the support edges 44, 46 of the support chamfer 34, and that one and the same insert can be used for different bore radii r ⁇ r 2 .
• the invention relates to a cutting insert for tools rotating about a tool axis, in particular for multi-cutting drilling tools.
• the cutting insert has a skin cutting edge 26 and a secondary cutting edge 32, which extends radially outward through a cutting edge 30 at an angle thereto.
• a support chamfer 34 is arranged in the area of the secondary cutting edge 32, which is delimited by two support edges 44, 46 which are spaced apart in the direction of rotation of the tool, the support edges covering the entire length have the same radius distance or r 2 from the tool axis 24.
• the support edges 44, 46 are expediently aligned parallel to the tool axis 24, while the support chamfer is expediently designed as a flat surface parallel to the tool axis 24.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Drilling Tools (AREA)
• Cutting Tools, Boring Holders, And Turrets (AREA)
• Sawing (AREA)
• Mechanical Treatment Of Semiconductor (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7653009

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (23)

Citations (2)

Family Cites Families (18)

• 2000
  • 2000-08-16 DE DE10040612A patent/DE10040612A1/de not_active Ceased
• 2001
  • 2001-07-11 AT AT01951667T patent/ATE419084T1/de active
  • 2001-07-11 AU AU2001272532A patent/AU2001272532A1/en not_active Abandoned
  • 2001-07-11 EP EP01951667A patent/EP1311363B1/de not_active Expired - Lifetime
  • 2001-07-11 WO PCT/EP2001/008001 patent/WO2002014003A1/de not_active Ceased
  • 2001-07-11 US US10/344,796 patent/US7237985B2/en not_active Expired - Lifetime
  • 2001-07-11 JP JP2002519129A patent/JP4928708B2/ja not_active Expired - Lifetime
  • 2001-07-11 DE DE50114622T patent/DE50114622D1/de not_active Expired - Lifetime

Patent Citations (2)

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