Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23C—MILLING
  • B23C5/00—Milling-cutters
  • B23C5/16—Milling-cutters characterised by physical features other than shape
  • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
  • B23C5/202—Plate-like cutting inserts with special form
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23C—MILLING
  • B23C2200/00—Details of milling cutting inserts
  • B23C2200/04—Overall shape
  • B23C2200/0416—Irregular
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23C—MILLING
  • B23C2200/00—Details of milling cutting inserts
  • B23C2200/04—Overall shape
  • B23C2200/0433—Parallelogram
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23C—MILLING
  • B23C2200/00—Details of milling cutting inserts
  • B23C2200/20—Top or side views of the cutting edge
  • B23C2200/201—Details of the nose radius and immediately surrounding areas
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23C—MILLING
  • B23C2200/00—Details of milling cutting inserts
  • B23C2200/20—Top or side views of the cutting edge
  • B23C2200/203—Curved cutting edges
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23C—MILLING
  • B23C2200/00—Details of milling cutting inserts
  • B23C2200/20—Top or side views of the cutting edge
  • B23C2200/205—Discontinuous cutting edges
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23C—MILLING
  • B23C2200/00—Details of milling cutting inserts
  • B23C2200/24—Cross section of the cutting edge
  • B23C2200/246—Cross section of the cutting edge rounded
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23C—MILLING
  • B23C2210/00—Details of milling cutters
  • B23C2210/20—Number of cutting edges
  • B23C2210/205—Number of cutting edges six
• • 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
  • Y10T407/22—Cutters, for shaping including holder having seat for inserted tool
• • 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
  • Y10T407/00—Cutters, for shaping
  • Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
  • Y10T407/235—Cutters, for shaping including tool having plural alternatively usable cutting edges with integral chip breaker, guide or deflector
• • 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
  • Y10T407/24—Cutters, for shaping with chip breaker, guide or deflector
  • Y10T407/245—Cutters, for shaping with chip breaker, guide or deflector comprising concave surface in cutting face of tool

Definitions

• the invention relates to a cutting insert for a end mill for machine milling with the basic shape of a parallelogram, along the longitudinal sides of which straight cutting edges are formed, to which radius cutting edges are connected, which are located on the parallelogram corners with the smaller corner angles. Furthermore, cutting edges (3) with a convex curvature are arranged on the parallelogram transverse sides, the at least one radius of curvature of which is several times larger than the radius of curvature of the radius cutting edges.
• Cutting plates of the aforementioned type are known from document US 5,413,023 B1.
• Such inserts are releasably attached to a tool holder of the end mill, they are therefore interchangeable and also reversible to use either one of the two straight cutting edges or one of the curved cutting edges, which are provided for different milling jobs.
• the use of one of the straight longitudinal cutting edges requires the cutting plate to be aligned on the end mill, in which the mutually parallel cutting edges lie parallel to the axis of rotation of the end mill. This corresponds to the so-called vertical position of the cutting plate, with which it is possible to be parallel to the straight cutting edges to process the aligned workpiece wall.
• the cutting plate is placed in an inclined position from the vertical position in order to allow either the radius cutting edge or the less curved cutting edge on the relevant parallelogram transverse side of the cutting plate to come into contact with the workpiece.
• the radius cutting edges are only used for easier machining in the respective inclined operating position of the cutting plates, which is why the radius cutting edges are usually used for finishing.
• the further cutting edge located on the transverse side is brought into the workpiece engagement with a weaker curvature, in order to be able to machine a workpiece surface extending perpendicular to the milling cutter axis in particular by roughing.
• the less curved cutting edges on the transverse sides of the insert not only have a larger radius of curvature than the corner-side radius cutting edges, they can also be made considerably longer than the radius cutting edges. As a result, much less cutting is achieved with the weakly curved cutting edges than with the strongly curved radius cutting edges.
• the invention is therefore based on the object to provide inserts of the type described, in which the less curved cutting edges on the transverse sides are offset from the corner-side radius cutting edges with a greater curvature and the operation with the radius cutting edges on the one hand and the weakly curved cutting edges on the other hand have a clearly distinguishable inclination position the inserts required.
• This object is achieved according to the invention in that there is an edge region with a concave curvature on the transverse sides between the radius cutting edges and the convexly curved cutting edges, depending on the inclination of the cutting plate, either the radius cutting edge or the convexly curved cutting edge on the respective transverse side in workpiece engagement comes.
• the concavely curved The area between the radius cutting edges and the other, weakly curved cutting edges on the transverse cutting edge sides allows either only the workpiece engagement with the radius cutting edge or only with the weakly curved further cutting edge on the respective transverse side. This makes it easier to avoid incorrect processing.
• Fig. 1 shows the view of a cutting plate according to the invention in the inclined position for a finishing process with one of the corner radius cutting edges and
• 1 and 2 show the outline of the cutting plate, which essentially corresponds to that of a parallel corresponds to grammes, apart from the execution of the curved transverse sides, which will be discussed below.
• the cutting plate has longitudinal edges that are parallel to one another and are designed as cutting edges 1. This means that milling work can also be carried out in the vertical position of the insert. In this position, not shown in the drawing, the longitudinal center line B of the cutting plate coincides with the axis of rotation A of the milling cutter.
• the insert has corners with a corner angle greater than 90 degrees and corners with a corner angle less than 90 degrees.
• the cutting plate has radius cutting edges 2 which have a relatively strong curvature.
• the radius of curvature Rl is correspondingly small.
• the radius cutting edges 2 represent the continuation of the longitudinal cutting edges 1, and they are designed to extend around the respective corner of the cutting plate.
• the radius cutting edges 2 which are convexly curved towards the outside, merge into a concavely curved edge region 4, which has a corresponding negative radius of curvature.
• This curvature area 4 is followed by a less curved cutting edge 3 on the transverse cutting edge sides, which in the case of a circular curvature has a single curvature.
• Mung radius R2 which is much larger than the radius of curvature Rl of the radius cutting edges 2.
• a cutting insert of the type in question has a length of approximately 12 mm and a width of approximately 7 mm.
• the radius of curvature R1 of the radius cutting edges 2 is 1 mm and the radius of curvature R2 of the transverse side cutting edges 3 is approximately 6 mm, ie it is six times the radius of curvature R1.
• the length of the transverse side cutting edges 3 extends over approximately three quarters of the transverse side length of the cutting plate, followed by the negative curvature region 4 with a radius of curvature of approx. wa at 2 mm.
• the above-mentioned distances C and D at the angle of inclination ⁇ of the insert result from the fact that of the two tangents Tl and T2 shown in FIG. 2, the tangent T2 is closer to the center M of the insert than the tangent Tl. It is important for this definition that the tangent Tl is applied to the slightly curved transverse side cutting edge so that one of the perpendiculars to this tangent Tl passes through the center M of the cutting plate. Consequently, the base angle of this perpendicular to the tangent T1 is 90 degrees. It is also important for this definition that the tangent T2 to the radius cutting edge T2 is the one that runs parallel to the tangent Tl.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Milling Processes (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34201916

Family Applications (1)

Country Status (7)

Families Citing this family (16)

Family Cites Families (10)

• 2003
  • 2003-08-23 DE DE10338784A patent/DE10338784B4/de not_active Expired - Fee Related
• 2004
  • 2004-08-18 EP EP04764232A patent/EP1658153A1/de not_active Withdrawn
  • 2004-08-18 US US10/569,119 patent/US7402005B2/en not_active Expired - Fee Related
  • 2004-08-18 JP JP2006524294A patent/JP2007503320A/ja active Pending
  • 2004-08-18 CA CA002537279A patent/CA2537279A1/en not_active Abandoned
  • 2004-08-18 CN CNB200480024265XA patent/CN100421850C/zh not_active Expired - Fee Related
  • 2004-08-18 WO PCT/EP2004/009245 patent/WO2005021196A1/de not_active Application Discontinuation

Non-Patent Citations (1)

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