Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
  • B23B29/04—Tool holders for a single cutting tool
• • 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
  • B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
  • B23B27/1625—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped by a clamping member acting almost perpendicularly on the chip-forming plane
  • B23B27/164—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped by a clamping member acting almost perpendicularly on the chip-forming plane characterised by having a special shape
• • 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
  • B23B27/04—Cutting-off tools
• • 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
  • B23B27/08—Cutting tools with blade- or disc-like main parts
• • 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
  • B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
• • 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
  • B23B2200/048—Star form
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2200/00—Details of cutting inserts
  • B23B2200/36—Other features of cutting inserts not covered by B23B2200/04 - B23B2200/32
  • B23B2200/3627—Indexing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2200/00—Details of cutting inserts
  • B23B2200/36—Other features of cutting inserts not covered by B23B2200/04 - B23B2200/32
  • B23B2200/369—Mounted tangentially, i.e. where the rake face is not the face with the largest area
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2205/00—Fixation of cutting inserts in holders
  • B23B2205/12—Seats for cutting inserts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2260/00—Details of constructional elements
  • B23B2260/104—Markings, i.e. symbols or other indicating marks
• • 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
  • Y10T407/2272—Cutters, for shaping including holder having seat for inserted tool with separate means to fasten tool to holder
  • Y10T407/2274—Apertured 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

Definitions

• a problem with such cutting inserts is, inter alia, that a relatively narrow portion of the indexable cutting insert, which carries a cutting edge, protrudes therefrom in the active position mounted on an insert holder in order to penetrate into a workpiece surface and to be able to pierce a groove in the width of the cutting edge ,
• the cutting edge is the part furthest from the indexable insert holder.
• cutting edges is meant the alignment of chip and flank surfaces at a cutting edge relative to the circumferential direction.
• Coincidentally aligned cutting edges thus have rake faces pointing in the same circumferential direction (counterclockwise or counterclockwise) while oppositely directed cutting edges accordingly have rake faces facing circumferentially in opposite directions, respectively. The same applies of course to the respective open spaces.
• This embodiment makes it possible to support a respective active cutting edge, which is formed in plan view by a corner between a peripheral portion of a long and a short side, with a contact surface on the other, opposite long side and at the same time with a support member on the support respective active cutting edge opposite short side, which has a correspondingly greater distance from the active cutting edge and from the (then active) contact surface of the long side due to the unequal length of the formation of the distances between the cutting edges, which leads to the aforementioned favorable leverage ratios.
• this ratio can be made more favorable or optimized in each case by increasing the ratio of long to short sides.
• the square formed by the cutting edges is a parallelogram, each having two equal short sides and two long sides of equal length, in particular a rectangle.
• the aspect ratio of long to short sides of the quadrangle is at least 1, 1 and at most 5.
• An aspect ratio of long to short sides of at least 1, 2 and at most 2 is preferred. preferably at most 1, 5.
• the aspect ratio of long to short sides is about 1.25 to 1.3.
• the indexable insert is primarily intended for grooving, cutting grooves on a rotating workpiece, or cutting off a portion of the workpiece (by piercing the groove to the center of the workpiece), the corresponding indexable insert is generally relatively thin, ie Also, the short sides of the square spanned by the cutting edges are still relatively long relative to the thickness of the cutting insert.
• the ratio of the short sides of the square to the thickness of the indexable insert is at least 2 and at most 15, preferably at least three and at most 10. In a particular embodiment, the ratio of the short sides to the (maximum) thickness of the indexable insert is about 6 to 7th
• a positioning notch is meant a recess in the short side which permits engagement of a corresponding supporting or positioning member on an indexable insert holder and together with the active cutting edge and an abutment surface on the long side defines a corresponding lever and the position of the indexable insert defining stop points.
• two contact surfaces arranged at a distance from the respectively nearest cutting edge and also at a distance from one another are provided on the sections of the peripheral surface extending along the long sides of the quadrilateral.
• the two contact surfaces are therefore each somewhere in the area between a cutting edge and the middle of the long side.
• the indexable insert consists of a central body with a first plate thickness and the central fixing hole, as well as four corner portions of lesser thickness, on which the cutting edges are arranged with free surfaces and clamping surfaces and the secondary relief surfaces.
• the object underlying the invention is achieved in that one of the flanks a stop surface is provided, which defined by the intersection of the angled flanks Corner is spaced, while at the second edge also at a distance from the corner, a support member is provided with a convex, round or polygonal cross-section.
• the angled flanks do not have to be rectilinear, and the point of intersection between these flanks can also be an imaginary intersection by an imaginary extension of an averaged course of these flanks.
• the purpose of the feature described above is that the abutment surface should be located as close as possible to the free edge of the recess below an active cutting edge and away from the support element, but without coming into contact with a (non-active) cutting edge or rake face.
• the above-defined corner has a large distance from this free edge of the recess and consequently the stop surface has a large distance from this corner, without it being important to the exact dimensions and the exact location of the corner or the stop surface.
• the receiving space and the side surface of the indexable insert holder can be designed so that the entire main part and a part of two further cutting corners are accommodated in the receiving space, but in any case a cutting edge over the side surface and out of the receiving space protrudes. This is the respectively active cutting edge or cutting corner.
• cutting edge in this case is meant the corner region recognizable in the lateral plan view at the four corners of the rectangle defined above and comprising the cutting edge, which in the installed state (and in the side view) projects beyond the contour of the insert holder with an active cutting edge.
• the indexable insert holder has a mounting hole piercing the side surface, wherein the distance of the farthest from the support element point of the abutment surface to the nearest point of the support element is greater than the distance of the same points respectively to the center of the mounting hole.
• the support member, the axis of the mounting hole and the abutment surface thus span a triangle whose longest side extends between the support member and the abutment surface.
• the invention also relates to a combination of an indexable insert according to one of claims 1 to 14, as described above, and an indexable insert holder, as described above and defined in any one of claims 15 to 18, wherein the distance of the center of the mounting hole in the side surface of the indexable insert holder to the abutment surface and the support member is smaller than the distance of the center of the fixing hole to the abutment surface and the positioning notch of the indexable insert.
• the decisive advantage of the inserts according to the invention and the indexable insert holder is that at a given penetration depth, which is defined by the length or the projection of the corner regions of the indexable insert whose thickness is less than the length of the cutting edge measured perpendicular to the main surfaces, a support the active cutting edge or cutting edge is possible with relatively favorable lever ratios, whereby the position of the cutting edge remains permanently defined exactly.
• FIG. 1 shows an indexable insert in the plan view of one of the main surfaces and in an end view
• the clear distance of the respective cutting edge 4 from the main part 1 thus determines the maximum immersion depth of the cutting tips 1 a, b, c, d in a workpiece, wherein the indexable insert holder is designed so that substantially only the active cutting tip on the side surface 21 and ., The contour of the indexable insert holder 20 protrudes.
• the support element or the positioning pin 27 engages in the positioning notch 5b, which has a convex, curved course with a varying radius, which is in the center of the positioning notch 5a, b is slightly smaller than the radius of the pin 27 and outside the center becomes larger such that the pin 27 abuts substantially along two line-shaped areas on the surface of the positioning notch.
• the contact surface 6b bears against the abutment surface 25 of the flank 23.
• the flanks 23, 24 are arranged and dimensioned so that they have no contact with the recorded in the insert seat cutting edges 4b and 4c and the adjacent chip and open spaces.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Cutting Tools, Boring Holders, And Turrets (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=45974279

Family Applications (1)

Country Status (7)

Cited By (2)

Families Citing this family (25)

Citations (5)

Family Cites Families (17)

• 2011
  • 2011-04-08 DE DE102011007076A patent/DE102011007076A1/de not_active Withdrawn
• 2012
  • 2012-03-30 CN CN201280017398.9A patent/CN103459069B/zh active Active
  • 2012-03-30 US US13/985,492 patent/US9457409B2/en active Active
  • 2012-03-30 EP EP12714624.9A patent/EP2694236B1/de active Active
  • 2012-03-30 JP JP2014503094A patent/JP2014509956A/ja active Pending
  • 2012-03-30 KR KR1020137025425A patent/KR101819786B1/ko active Active
  • 2012-03-30 WO PCT/EP2012/055884 patent/WO2012136600A1/de not_active Ceased

Patent Citations (5)

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