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
  • B23B27/04—Cutting-off tools
• • 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
  • B23B29/043—Tool holders for a single cutting tool with cutting-off, grooving or profile cutting tools, i.e. blade- or disc-like main cutting parts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23C—MILLING
  • B23C5/00—Milling-cutters
  • B23C5/02—Milling-cutters characterised by the shape of the cutter
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23C—MILLING
  • B23C5/00—Milling-cutters
  • B23C5/02—Milling-cutters characterised by the shape of the cutter
  • B23C5/08—Disc-type cutters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2200/00—Details of cutting inserts
  • B23B2200/08—Rake or top surfaces
  • B23B2200/086—Rake or top surfaces with one or more grooves
  • B23B2200/088—Rake or top surfaces with one or more grooves for clamping
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2200/00—Details of cutting inserts
  • B23B2200/16—Supporting or bottom surfaces
  • B23B2200/165—Supporting or bottom surfaces with one or more grooves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2205/00—Fixation of cutting inserts in holders
  • B23B2205/02—Fixation using an elastically deformable clamping member
• • 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
  • Y10T407/2282—Cutters, for shaping including holder having seat for inserted tool with separate means to fasten tool to holder including tool holding clamp and clamp actuator
• • 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
  • Y10T407/2282—Cutters, for shaping including holder having seat for inserted tool with separate means to fasten tool to holder including tool holding clamp and clamp actuator
  • Y10T407/2286—Resiliently biased clamp jaw
• • 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
  • Y10T407/2282—Cutters, for shaping including holder having seat for inserted tool with separate means to fasten tool to holder including tool holding clamp and clamp actuator
  • Y10T407/2286—Resiliently biased clamp jaw
  • Y10T407/2288—Integral with holder
• • 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
  • Y10T407/25—Cutters, for shaping including cut off tool

Definitions

• the present invention relates to cutting tools of the type in which a cutting insert is resiliently clamped in a self-retaining manner in an insert pocket.
• Such cutting tools are grooving tools, in which the insert holder has the form of a generally rectangular blade, and rotary slot- cutting tools, in which the insert holder is disc shaped with the cutting inserts retained in insert pockets around the periphery of the disc.
• the insert pocket is located in a clamping portion of the cutting tool and is defined between a clamping jaw and a base jaw.
• the clamping and base jaws are resiliently displaceable with respect to each other and are formed from an integral single piece.
• a cutting portion 210 of a typical prior art cutting tool is shown in Figs. 8 and 9.
• the cutting portion 210 comprises an upper clamping jaw
• the cutting insert 226 comprises upper and lower abutment surfaces 228, 230 and a cutting edge 232 at a forward end of the cutting insert 226.
• the upper and lower abutment surfaces 228, 230 converge rearwardly from the forward end of the cutting insert 226.
• the cutting insert 226 forces apart the clamping and base jaws 212, 214 and the lower abutment surface 230 abuts the clamping surface 222 of the base jaw 214.
• the upper abutment surface 228 and the clamping surface 220 of the clamping jaw 212 are in abutment only at their forward regions with a gap 234 formed between their rear regions. The presence of the gap 234 is intentional and is a consequence of manufacturing tolerances.
• 6,234,727 Bl which describes a cutting tool having a resilient clamping mechanism in which the clamping jaw comprises a first narrow bridge section connecting the clamping jaw to the body portion of the cutting tool and a second narrow bridge section which extends generally towards the second clamping surface.
• the second narrow bridge section is generally situated between the recess and an aperture and gives rise to a second resilience axis of rotation.
• the first narrow bridge section is situated generally between the aperture and the upper side of the clamping jaw and gives rise to a first resilience axis of rotation.
• the clamping jaw has a forward first clamping surface separated by a recess from a rearward second clamping surface.
• the first clamping surface can be resiliently displaced about the first resilience axis of rotation, whereas the second clamping surface can independently be resiliently displaced about the second resilience axis of rotation.
• the first clamping surface exerts a first force on a forward portion of the upper surface of an insert, whilst the second clamping surface exerts a second force on a rearward portion of the upper surface of the insert. If the first narrow bridge section is designed so that the first resilience axis of rotation P lies on the line of action of second force, then the first and second forces are independent of each other. If the first resilience axis of rotation does not lie on the line of action of the second force, then the first and second forces will not be independent of each other.
• the degree of independence depends on the closeness of the first resilience axis of rotation to the line of action of the second force.
• the requirement that the first resilience axis of rotation lie on the line of action of second force and the fact that the second resilience axis of rotation is formed by the second narrow bridge section between the recess and the aperture, is a constructional restraint that leaves little room for freedom of design of the clamping jaw and consequently limits the design of the cutting insert. It is an object of the present invention to provide a cutting tool of the type in which a cutting insert is resiliently clamped in a self-retaining manner, wherein the aforementioned disadvantages are significantly reduced or overcome.
• a cutting tool comprising an insert holder and a cutting insert, the insert holder comprising a body portion and a clamping portion, the clamping portion comprising a base jaw a clamping jaw and an insert pocket therebetween, the insert pocket extending from a pocket opening at a forward end of the pocket to a rear end thereof, the clamping jaw comprising two elongated sub-clamping jaws separated by an elongated forward recess, wherein the cutting insert is resiliently clamped in the insert pocket between the two elongated sub-clamping jaws and the base jaw and wherein the two elongated sub-clamping jaws are independently resilient.
• the elongated forward recess extends from a first opening adjacent the insert pocket in a generally rearward direction and in a direction away from the base jaw to a first termination adjacent the body portion.
• a rear recess extends adjacent the elongated rear sub- clamping jaw in a generally rearward direction from a second opening adjacent the insert pocket to a second termination adjacent the body portion.
• the base jaw has an abutment surface adjacent the insert pocket
• the elongated forward sub-clamping jaw has a forward clamping surface adjacent the insert pocket
• the elongated rear sub- clamping jaw has a rear clamping surface adjacent the insert pocket, the abutment surface being generally opposite the forward and rear clamping surfaces.
• the abutment surface is divided by a base recess into a forward abutment surface generally opposite the forward clamping surface and a rear abutment surface generally opposite the rear clamping surface.
• the forward and rear clamping surfaces lie on a first straight line and the forward and rear abutment surfaces lie on a second straight line, and the first and second straight lines converge to a point rearward of the insert pocket forming a first acute angle therebetween.
• the forward clamping surface lies on a first straight line and the forward and rear abutment surfaces lie on a second straight line, and the first and second straight lines converge to a point rearward of the insert pocket forming a first acute angle therebetween, the rear clamping surface lies on a sixth straight line, the sixth and second straight lines converge to a point rearward of the insert pocket and form between them a fourth acute angle, the first and sixth straight lines are non- collinear and the first straight line passes through the rear sub-clamping jaw.
• the elongated forward sub-clamping jaw has a length that is greater than a terminal width thereof.
• the elongated forward recess has a length which is greater than the terminal width of the elongated forward sub- clamping jaw.
• the elongated rear sub-clamping jaw has a length that is greater than a terminal width thereof.
• the cutting insert comprises, at a forward end thereof, a cutting portion having a cutting edge and, at a rear end thereof, a locating portion, the locating portion comprises an upper locating surface and a lower locating surface, and with the cutting insert retained in the insert pocket the upper locating surface abuts the forward and rear clamping surfaces and the lower locating surface abuts the abutment surface, and in a side view of the cutting insert, the upper and lower locating surfaces lie on third and fourth straight lines that form a second acu-te angle therebetween, and the third and fourth straight lines converging to a point rearward of the cutting insert.
• the cutting insert comprises, at a forward end thereof, a cutting portion having a cuttixig edge and, at a rear end thereof, a locating portion, the locating portion cozmprises an upper locating surface and a lower locating surface, the upper locating surface of the cutting insert is divided into three sections, a forward section adjacent the cutting portion, a rear section distal the cutting portio-n and a middle section located between the forward and rear sections, and with the cutting insert retained in the insert pocket the forward section of th-e upper locating surface abuts the forward clamping surface, the rear section of the upper locating surface abuts the rear clamping surface, the lower locating surface abuts the abutment surface, and in a side view of the cutting insert, the upper locating surface forward section and the lower locating surface lie on third and fourth straigtit lines, respectively, that form a second acute angle therebetween, the upper locating surface rear section lies on a fifth straight line that forms a third
• the forward and middle sections of the upper Locating surface form a first obtuse interior angle therebetween and the mid-die and rear sections of the upper locating surface form a second obtuse exterior angle.
• the insert holder is provided with a protuberance having a rear stop surface adjacent the insert pocket, the protuberance being located between the rear recess and a lower recess, the lower recess extending from the rear of the insert pocket, in a generally rearward direction
• the cutting insert is provided with a rear locating surface distal the cutting portion, so that when the cutting insert is retained in the insert pocket the rear locating surface abuts the rear stop surface.
• the cutting insert is provided with an upper forward locating surface adjacent the cutting portion, and the insert holder is provided with a forward stop surface adjacent the forward clamping surface, so that when the cutting insert is retained in the insert pocket the upper forward locating surface abuts the forward stop surface.
• Fig. 1 is a partial side view of a cutting portion of an insert holder of a cutting tool in accordance with a first embodiment of the present invention
• Fig. 2 is a side view of a cutting insert of the cutting tool in accordance with the first embodiment of the present invention
• Fig. 3 is a partial side view of the cutting tool in accordance with the first embodiment of the present invention
• Fig. 4 is a side view of a cutting insert of the cutting tool in accordance with the second embodiment of the present invention
• Fig. 1 is a partial side view of a cutting portion of an insert holder of a cutting tool in accordance with a first embodiment of the present invention
• Fig. 2 is a side view of a cutting insert of the cutting tool in accordance with the first embodiment of the present invention
• Fig. 3 is a partial side view of the cutting tool in accordance with the first embodiment of the present invention
• Fig. 4 is a side view of a cutting insert of the cutting tool in accordance with the second embodiment of the present invention
• FIG. 5 is a partial side view of a cutting portion of an insert holder of a cutting tool in accordance with a second embodiment of the present invention
• Fig. 6 is a partial side view of the cutting tool in accordance with the second embodiment of the present invention
• Figs. 7A is a partial cross sectional view taken along the line VII- Nil in Figs. 3 and 6 passing through the forward clamping surface and forward section of the upper locating surface, showing the mechanism for preventing lateral movement of an insert having concave N-shaped cross- sectional surfaces
• Figs. 7B is similar to Fig.7A but for an insert having convex N-shaped cross-sectional surfaces
• Fig. 8 is a partial side exploded view of a cutting portion of prior art cutting tool
• Fig. 9 is a partial side view of the cutting portion of the prior art cutting tool.
• the cutting tool 10 comprises an insert holder 12 and a cutting insert 14.
• the insert holder 12 has a clamping portion 16 and a body portion 18.
• the clamping portion 16 comprises an upper clamping jaw 20, a lower base jaw 22 and an insert pocket 24 therebetween.
• the insert pocket 24 extends from a pocket opening 26 at a forward end 28 of the pocket 24 to a rear end 30 thereof.
• the clamping jaw 20 comprises two elongated sub-clamping jaws, an elongated forward sub-clamping jaw 32 and an elongated rear sub-clamping jaw 34.
• the elongated forward sub-clamping jaw 32 extends from a forward clamping surface 36 adjacent the insert pocket 24 to a terminal end 38.
• the elongated forward sub-clamping jaw 32 has a length dimension and a width dimension and is bound along its length dimension by a chip surface 40 on one side and an elongated forward recess 42 on the other side.
• the elongated forward sub-clamping jaw 32 has a length LCI defined along its length dimension between the forward clamping surface 36 and its terminal end 38, and a terminal width WC1 defined at its terminal end 38 along its width dimension between the chip surface 40 and the elongated forward recess 42.
• the length LCI of the elongated forward sub-clamping jaw 3*2 is greater than its terminal width WC1.
• the elongated forward recess 42 has a length LR1 defined between a first opening 44 and a first termination 46.
• the length LRU of the elongated forward recess 42 is greater than the terminal width WCH of the forward sub-clamping jaw 32.
• the elongated rear sub-clamping jaw 34 has a rear clamping surface 48 adjacent the insert pocket 24 and is separated from the elongated forward sub-clamping jaw 32 by the elongated forward recess 42.
• the elongated forward recess 42 extends from the insert pocket 24 in a generally rearward direction and in a direction away from the base jaw 22 towards, the body-portion 18, extending from the first opening 44 adjacent the iri-sert pocket 24 to the first termination 46 adjacent the body portion 18.
• the elongated rear sub-clamping jaw 34 has a length dimension and a width dimension and extends from the rear clamping surface? 48 adjacent the insert pocket 24 to a terminal end 50.
• the elongated rear sub- clamping jaw 34 has a length LC2 defined along its length dimension between the rear clamping surface 48 and its terminal end 50, and a tern -inal width WC2 defined at its terminal end 50 along its width dimension.
• the length LC2 of the elongated rear sub-clamping jaw 34 is greater tha ⁇ its terminal width WC2.
• a rear recess 52 extends adjacent the elongated rear sub- clamping jaw 34 in a generally rearward direction from the insert pockei; 24 towards the body portion 18, extending from a second opening 54 adjacent the insert pocket 24 to a second termination 56 adjacent the body portion. 18, so that the elongated rear sub-clamping jaw 34 is bound along its length dimension by the elongated forward recess 42 on one side and the Tear recess 52 on the other side.
• the rear recess 52 is an elongated recess having a length LR2 defined betvveen the second opening 54 and the second termination 56, the length LR2 being greater than the terminal width WC2 of the rear sub-clamping jaw 34.
• the rear recess 52 separates the rear sub-clamping jaw 34 from a protuberance 58.
• the protuberance 58 has a rear stop surface 60 adjacent the insert pocket 24 which may be used for locating the cutting insert 14 in the insert pocket 24 by urging the cutting insert 14 rearwardly until a rear locating surface 62 of the cutting insert 14 abuts the rear stop surface 60.
• an upper forward locating surface 64 of the insert 14, adjacent a cutting portion 66 thereof may abut a forward stop 68 of the insert holder 12.
• the forward stop 68 being located adjacent the forward clamping surface 36.
• Each sub-clamping jaw 32, 34 is resilient forming a cantilever having a resilience axis of rotation Rl, R2.
• the two sub-clamping jaws 32, 34 are independently resilient, so that the resilience axes of rotation are separated and independent of each other.
• the forward sub-clamping jaw 32 has the forward resilience axis of rotation Rl, located in the vicinity of the terminal end 38 thereof.
• the rear sub-clamping jaw 34 has the rear resilience axis of rotation R2, located in the vicinity of the terminal end 50 thereof.
• a lower recess 70 extends from the rear end 30 of the insert pocket 24, in a generally rearward direction.
• the lower recess 70 separates the protuberance 58 from the base jaw 22.
• the base jaw 22 comprises an abutment surface 72 adjacent the insert pocket 24.
• the abutment surface 72 is generally opposite the forward and rear clamping surfaces 36, 48.
• the abutment surface 72 is divided by a base recess 74 into a forward-abutment surface 76 generally opposite the forward clamping surface 36 and a rear- abutment surface 78 generally opposite the rear clamping surface 48.
• the forward and rear clamping surfaces 36, 48 lie on a first straight line LI
• the forward and rear abutment surfaces 76, 78 lie on a second straight line L2
• the first and second straight lines LI, L2 converge to a point PI rearward of the insert pocket 24 and form a first acute angle l therebetween.
• the cutting insert 14 comprises, at a forward end thereof, the cutting portion 66 having a cutting edge 98 and, at a rear end thereof, a locating portion 80.
• the locating portion 80 comprises an upper locating surface 82, a lower locating surface 84 and the rear locating surface 62.
• the upper and lower locating surfaces 82, 84 lie on third and fourth straight lines L3, L4 that form a second acute angle ⁇ 2 therebetween, the third and fourth straight lines L3, L4 converging to a point P2 rearward of the cutting insert.
• the cutting insert 14 can be inserted into the insert pocket 24 by simply positioning the rear locating surface 62 adjacent the pocket opening 26 and urging the cutting insert 14 rearwardly into the insert pocket 24.
• a distance h x between the forward clamping surface 36 of the forward sub-clamping jaw 32 and the forward abutment surface 76 of the base jaw 22 without the cutting insert 14 located in the insert pocket 24, is less than A distance H !
• a distance h 2 between the rear clamping surface 48 of the rear sub-clamping jaw 34 and the rear abutment surface 78 of the base jaw 22 without the cutting insert 14 located in the insert pocket 24, is less than a distance H 2 between the upper and lower locating surfaces 82, 84 of the cutting insert 14 taken at a rear clamping region 88 of the cutting insert 14, where the rear clamping surface 48 and the rear abutment surface 78 would abut the cutting insert 14 with the insert located in the insert pocket 24.
• the forward sub-clamping jaw 32 When the cutting insert 14 is inserted into the insert pocket 24, the forward sub-clamping jaw 32 is forced away from the base jaw 22 when the forward clamping region 86 is located between the forward clamping surface 36 and the forward abutment surface 76, thereby increasing the distance between the forward clamping surface 36 and the forward abutment surface 76.
• the rear sub-clamping jaw 48 is forced away from the base jaw 22 when the rear clamping region 88 is located between the rear clamping surface 48 and the rear abutment surface 78, thereby increasing the distance between the rear clamping surface 48 and the rear abutment surface 78.
• the cutting insert 14 is resiliently clamped in the insert pocket 24 with the upper locating surface 82 abutting the forward and rear clamping surfaces 36, 48 and the lower locating surface 84 abutting the abutment surface 72, and the clamping jaw 20 exerts two independent clamping forces on the cutting insert upper locating surface 82.
• a forward clamping force FI is exerted by the forward sub-clamping jaw 32 and a rear clamping force F2 is exerted by the rear sub-clamping jaw 34.
• the independence of the two clamping forces FI, F2 is not dependent on whether or not the line of action of the second clamping force F2 passes through the forward resilience axis of rotation Rl.
• the upper and lower locating surfaces 82, 84 of the cutting insert 14 lie on the straight lines L3, L4 and in a side view of the insert holder 12, the forward and rear clamping surfaces 36, 48 of the clamping jaw 20 lie on a first line LI.
• An advantage of the complete independence of the two clamping forces FI, F2 that the two sub-clamping jaws 32, 34 exert on the upper locating surface 82 of the cutting insert 14 is that there is a greater freedom of the location of the clamping surfaces 36, 48. Attention is now drawn to Figs. 4 to 6 showing a cutting tool 10' in accordance with a second embodiment of the present invention.
• the cutting tool 10' in accordance with the second embodiment is similar to the cutting tool 10 in accordance with the first embodiment apart from two features, namely, the geometry of the upper locating surface 82' of the cutting insert 14' and the length LC2' of the elongated rear sub-clamping jaw 34' which effects the relative location of the forward and rear clamping surfaces 36, 48 of the forward and rear sub-clamping jaws 32, 34, respectively.
• Reference numerals marked with a "prime” indicate members of the second embodiment of the invention which are similar the members of the first embodiment of the invention with “unprimed” reference numerals but which are modified as a consequence of the differences between the first and second embodiments of the invention.
• the upper locating surface 82' of the cutting insert 14' is divided into three sections, a forward section 92 adjacent the cutting portion 66, a rear section 94 distal the cutting portion 66 and a middle section 96 located between the forward and rear sections 92, 94.
• the forward and middle sections 92, 96 form a first obtuse interior angle ⁇ l therebetween and the middle and rear sections 96, 94 form a second obtuse exterior angle ⁇ 2 therebetween.
• the first obtuse interior angle ⁇ l can be less, equal or greater than the second obtuse exterior angle ⁇ 2.
• the forward section 92 of the upper locating surface and the lower locating surface 84 lie on the third and fourth straight lines L3, L4, respectively, that form the second acute angle ⁇ 2 therebetween.
• the rear section 94 of the upper locating surface lies on a fifth straight line L5 that forms a third acute angle ⁇ 3 with the fourth straight line L4 on which the lower locating surface 84 lies.
• the upper locating surface 82' of the cutting insert 14 in accordance with the second embodiment has a stepped formation, with the rear section 94 of the upper locating surface being recessed relative to the forward section 92 of the upper locating surface, so that the third and fifth straight lines L3, L5 are non-collinear.
• the third straight line L3, on which the forward section 92 of the upper locating surface lies is a first given distance dl from the rear section 94 of the upper locating surface. Since the third and fifth lines L3, L5 are not necessarily parallel, the first given distance dl may be measured at any convenient point of the rear section 94 of the upper locating surface, for example, at its midpoint.
• the forward clamping surface 36 lies on the first straight line LI and the forward and rear abutment surfaces 76, 78 lie on the second straight line L2, the first and second straight lines LI, L2 converge to the point PI rearward of the insert pocket 24 and form between them the first acute angle ⁇ l.
• the rear clamping surface 48 lies on a sixth straight line L6, the sixth and second straight lines L6, L2 converge to a point P3 rearward of the insert pocket 24 and form between them a fourth acute angle ⁇ 4.
• the forward and rear clamping surfaces 36, 48 of the insert holder 12' in accordance with the second embodiment do not lie on the same straight line but have a stepped formation, generally complimentary to the stepped formation of the upper locating surface 82' of the cutting insert 14' in accordance with the second embodiment.
• the first and sixth straight lines LI, L6 are non-collinear and the first straight line LI, on which the forward clamping surface 36 lies, passes through the rear sub- clamping jaw 34' at a second given distance d2 from the rear clamping surface 48.
• the second given distance d2 may be equal to the first given distance dl. Since the first and sixth straight lines LI, L6 are not necessarily parallel, the second given distance d2 may be measured at any convenient point of the rear clamping surface 48, for example, at its midpoint.
• the insert holder 12' in accordance with the second embodiment is similar to the insert holder 12 in accordance with the first embodiment apart from the length LC2' of the rear sub-clamping jaw 34'.
• the length LC2' of the rear sub-clamping jaw 34' of the insert holder 12' in accordance with the second embodiment is longer than the length LC2 of the rear sub-clamping jaw 34 of the insert holder 12 in accordance with the first embodiment, all other dimensions being the same.
• the second given distance d2 is the difference between the length LC2 of the rear sub- clamping jaw 34' of the insert holder 12' in accordance with the second embodiment and the length LC2 of the rear sub-clamping jaw 34 of the insert holder 12 in accordance with the first embodiment.
• the rear sub-clamping jaw 34' is forced away from the base jaw 22 when the rear clamping region 88 is located between the rear clamping surface 48 and the rear abutment surface 78, thereby increasing the distance between the rear clamping surface 48 and the rear abutment surface 78.
• the insert holder 12' in order to precisely locate the cutting insert 14' in the insert pocket 24', the insert holder 12' may be provided with a protuberance 58 having a rear stop surface 60 adjacent the insert pocket 24' which may be used for locating the cutting insert 14' in the insert pocket 24' by urging the cutting insert 14' rearwardly until the rear locating surface 62 of the cutting insert 14' abuts the rear stop surface 60.
• an upper forward locating surface 64 of the cutting insert 14', adjacent the cutting portion 66 may abut a forward stop 68 of the insert holder 12'.
• the forward stop 68 being located adjacent the forward clamping surface 36.
• lateral stability of the cutting insert 14, 14' (for preventing lateral movement of the cutting insert 14, 14' with respect to the cutting tool 10, 10') can be achieved by forming the clamping surfaces 36, 48 of the clamping jaw 20, 20', and the abutment surfaces 76, 78 of the base jaw 22, with cross sectional shapes that mate the corresponding abutted locating surfaces 82, 82', 84 of the cutting insert 14, 14'. If desired, as shown in Fig.
• the clamping surfaces 36, 48 of the clamping jaw 20, 20', and the abutment surfaces 76, 78 of the base jaw 22 may have convex V-shaped cross-sections, and the upper and lower locating surfaces 82, 82', 84 of the cutting insert 14, 14' may have mating concave V-shaped cross-sectional surfaces.
• the clamping surfaces 36, 48 of the clamping jaw 20, 20', and the abutment surfaces 76, 78 of the base jaw 22 may have concave V-shaped cross- sections, and the upper and lower locating surfaces 82, 82', 84 of the cutting insert 14, 14' may have mating convex V-shaped cross-sectional surfaces.
• the thickness dimension T of the insert holder 12, 12' which typically is in the range of 0.5 mm to 12 mm.

Landscapes

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

Priority Applications (9)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34073936

Family Applications (1)

Country Status (18)

Cited By (8)

Families Citing this family (25)

Citations (2)

Family Cites Families (13)

• 2004
  • 2004-03-18 IL IL160935A patent/IL160935A/en active IP Right Grant
• 2005
  • 2005-01-25 US US11/041,204 patent/US7524147B2/en active Active
  • 2005-02-23 CA CA2559066A patent/CA2559066C/en not_active Expired - Lifetime
  • 2005-02-23 PL PL13196541T patent/PL2727671T3/pl unknown
  • 2005-02-23 NZ NZ550592A patent/NZ550592A/en unknown
  • 2005-02-23 AU AU2005221419A patent/AU2005221419A1/en not_active Abandoned
  • 2005-02-23 PT PT131965410T patent/PT2727671T/pt unknown
  • 2005-02-23 ZA ZA200607793A patent/ZA200607793B/en unknown
  • 2005-02-23 ES ES13196541.0T patent/ES2604466T3/es not_active Expired - Lifetime
  • 2005-02-23 PL PL05709120T patent/PL1740335T3/pl unknown
  • 2005-02-23 EP EP05709120.9A patent/EP1740335B1/en not_active Expired - Lifetime
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  • 2005-02-23 RU RU2006132910/02A patent/RU2359786C2/ru active
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