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GB1567004A - Tool tip - Google Patents

Tool tip Download PDF

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Publication number
GB1567004A
GB1567004A GB4426775A GB4426775A GB1567004A GB 1567004 A GB1567004 A GB 1567004A GB 4426775 A GB4426775 A GB 4426775A GB 4426775 A GB4426775 A GB 4426775A GB 1567004 A GB1567004 A GB 1567004A
Authority
GB
United Kingdom
Prior art keywords
recess
tip
tool tip
tool
sides
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4426775A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HERBERT Ltd A
Original Assignee
HERBERT Ltd A
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HERBERT Ltd A filed Critical HERBERT Ltd A
Priority to GB4426775A priority Critical patent/GB1567004A/en
Publication of GB1567004A publication Critical patent/GB1567004A/en
Expired legal-status Critical Current

Links

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
    • B23B27/16—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
    • B23B27/1644—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 and at the same time upon the wall of a hole in the cutting insert
    • B23B27/1651—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 and at the same time upon the wall of a hole in the cutting insert 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
    • B23B2200/08—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
    • B23B2215/00—Details of workpieces
    • B23B2215/68—Threaded components

Landscapes

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

Description

(54) TOOL TIP (71) We, ALFRED HERBERT LI MITED, a British Company of P.O. Box 30, Edgwick Works, Coventry, CV6 5GT, do hereby declare this invention for which we pray that a Patent may be granted to us and the method by which it is to be performed to be particularly described in and by the following statement: This invention relates to a tool tip for use in a machine tool, and particularly to such a tip having a plurality of cutting edges so that by indexing the tip, alternative cutting edges may be brought into operation. An object of the invention is to provide an improved tool tip of this kind.
According to the invention, a tool tip has a plurality of peripherally spaced projecting cutting edges, and a polygonally shaped recess in a major face thereof, the recess having a number of faces corresponding to the number of cutting edges, each of which faces extends in a direction generally perpendicular to the direction of projection of a respective one of the cutting edges, said faces being arranged for co-operation with clamping means for clamping the tip in operative position in a tool holder.
Preferably, the tip is generally polygonal and typically generally triangular, having a cutting edge in the vicinity of each of its apices.
One convenient form of the tool tip has a plurality of peripheral sides corresponding to the number of cutting edges, said sides being arranged for engagement with a supporting surface of a tool holder, the peripheral sides and the faces of the recess being arranged so that when a clamping force is applied to a face of the recess, a component of the force acts to resist disengagement of the corresponding external side and supporting surface.
The invention will now be described, by way of example, with reference to the accompanying drawings in which: Figure 1 is a side elevation of one form of tool tip of the invention; Figure 2 is a plan view of the tool tip of Figure 1; Figure 3 is a cross-sectional view of the tip of Figure 1 clamped in a tool holder; Figure 4 is a plan view of the assembly of Figure 3; Figure 5 is a side elevation of an alternative form of tool tip of the invention, and Figure 6 is a plan view of the tool tip of Figure 5.
Referring to Figures 1 and 2, these show a tool tip having a body 1 of generally triangular form having a cutting edge 2 adjacent to each apex of the triangle. The body has a base 3 for resting on a corresponding base of a tip-receiving recess and a number of peripheral sides 4 corresponding to the number of cutting edges, three sides 4 being provided in the case of the triangular tool tip described. A pair of the sides 4 are arranged to engage a corresponding pair of sides of the tool-holder for each clamped position of the tip, as will be described.
One main surface of the tool tip is formed with a generally triangular recess 5, the plain sides 6 of which are inclined inwardly in a direction towards the centre of the recess. Each side extends in a direction generally perpendicular to the direction of projection of a respective one of the cutting edges.
Figures 3 and 4 show the tool tip of Figures 1 and 2 clamped in a tool holder shown generally at 7. The holder has a body 8 having a tip-receiving recess 9 with a base 10 for engagement by the base 3 of the tip, and mutually inclined sides 11, 12 against which respective sides 4 of the tip engage. In the example described, the base 10 of the recess is on an inert 10a of tungsten carbide held in position by a retaining pin 10b. A clamping member 13 has a clamping surface 14 inclined in a manner corresponding to the inclination of the sides 6 of the recess 5 of the tool tip. The clamping member is placed in engagement with a side 6 of the tip extending between the pair of sides 4 engaged with the recess sides and a clamping force is applied, in a direction perpendicular to the base 3 of the tool tip by a screw 15 threadedly engaged with the body, or by other suitable clamping means. A component of this force urges the base 3 against the base of the recess and a further component of the force, resulting from the inclination of the recess side 6, produces force components acting to resist forces arising during cutting which would tend to pull the engaged sides 4 away from the corresponding sides of the tool holder recess. A further surface 16 on a leg 17 of the clamping member 13 is inclined in a generally opposite direction to the surface 14 for engagement with an inclined surface 18 on the body 8 and acts in a manner such as to provide additional resistance to said cutting forces.
It will be appreciated that, by virtue of the number of clamping sides 6 in the recess S corresponding to the number of cutting edges, the tool tip can be indexed by releasing the clamp and re-positioning the tool tip for clamping by means of an alternative side 6 of the recess.
In order to release the tip for indexing.
the clamping screw 15 is released to an extent sufficient to permit the clamping member 13 to be raised clear of the top of the tip by an appropriate amount. It is desirable for the clamping member to be retained in a region generally over the tool tip when unclamped and this is achieved, in the embodiment described. by locating the leg 17 between lugs 19 on the body 8 so as to limit angular movement of the clamping means.
Figures 5 and 6 show an alternative form of tool tip which is of generally similar shape to that of Figures 1 and 2, the principal difference being that there is a recess 20 in each main surface thereof which enables the tool tip to be reversed. This version of the tool tip is clamped into a tool holder recess in similar manner to that described in connection with Figures 3 and 4 and is both indexible and reversible.
Although the embodiments of tip described are of generally triangular form, it will be appreciated that other forms of tool tip are possible embodying the principles of the invention, examples being square and hexagonal. In all cases, the recess S would have a number of sides corresponding to the number of cutting edges provided to enable the tool tip to be clamped in a tool holder with any one of the cutting edges in an operational position. Such alternative forms of tool tip could also be made reversible by providing a clamping recess on both sides thereof, and the invention may be applied to tool tips designed either for external or internal machining operations.
WHAT WE CLAIM IS: 1. A tool tip having a plurality of peripherally spaced projecting cutting edges, and a polygonally shaped recess in a major face thereof, the recess having a number of faces corresponding to the number of cutting edges, each of which faces extends in a direction generally perpendicular to the direction of projection of a respective one of the cutting edges, said faces being arranged for co-opertion with clamping means for clamping the tip in operative position in a tool holder.
2. A tool tip according to Claim 1 which is generally polygonal and has a cutting edge in the vicinity of each of its apices.
3. A tool tip according to Claim 1 or Claim 2 wherein the tool tip is generally triangular.
4. A tool tip according to any one of the preceding Claims having a plurality of peripheral sides corresponding to the number of cutting edges, said sides being arranged for engagement singly with a supporting surface of a tool holder, the peripheral sides and the faces of the recess being arranged so that when a clamping force is applied to a face of the recess, a component of the force acts to resist disengagement of the corresponding peripheral side and supporting surface.
5. A tool tip according to any one of Claims 1 to 4 wherein the recess faces are inclined with respect to said major face.
6. A tool tip according to any one of the preceding claims wherein a recess is provided in each major surface of the tip and the cutting edges of the tip are arranged to enable the tip to be reversed.
7. A cutting tool tip substantially as hereinbefore described with reference to Figures 1 and 2 and Figures 5 and 6 of the accompanying drawings.
8. A combination of a tool tip according to any one of the preceding Claims and a tool holder the holder having a recess with a base and a pair of mutually angled sides with which latter a pair of corresponding sides of the tip are engaged, and clamping means engaged with a face of said tip recess and arranged to urge the tip against said base and against both of said sides of the holder recess.
9. A combination according to Claim 8 wherein the faces of the recess are inclined with respect to said major face and the clamping member has a clamping surface inclined in a manner corresponding to the inclination of said faces and engaging one of said faces.
10. A combination according to Claim 8 or Claim 9 wherein the clamping means has
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (11)

**WARNING** start of CLMS field may overlap end of DESC **. inclination of the sides 6 of the recess 5 of the tool tip. The clamping member is placed in engagement with a side 6 of the tip extending between the pair of sides 4 engaged with the recess sides and a clamping force is applied, in a direction perpendicular to the base 3 of the tool tip by a screw 15 threadedly engaged with the body, or by other suitable clamping means. A component of this force urges the base 3 against the base of the recess and a further component of the force, resulting from the inclination of the recess side 6, produces force components acting to resist forces arising during cutting which would tend to pull the engaged sides 4 away from the corresponding sides of the tool holder recess. A further surface 16 on a leg 17 of the clamping member 13 is inclined in a generally opposite direction to the surface 14 for engagement with an inclined surface 18 on the body 8 and acts in a manner such as to provide additional resistance to said cutting forces. It will be appreciated that, by virtue of the number of clamping sides 6 in the recess S corresponding to the number of cutting edges, the tool tip can be indexed by releasing the clamp and re-positioning the tool tip for clamping by means of an alternative side 6 of the recess. In order to release the tip for indexing. the clamping screw 15 is released to an extent sufficient to permit the clamping member 13 to be raised clear of the top of the tip by an appropriate amount. It is desirable for the clamping member to be retained in a region generally over the tool tip when unclamped and this is achieved, in the embodiment described. by locating the leg 17 between lugs 19 on the body 8 so as to limit angular movement of the clamping means. Figures 5 and 6 show an alternative form of tool tip which is of generally similar shape to that of Figures 1 and 2, the principal difference being that there is a recess 20 in each main surface thereof which enables the tool tip to be reversed. This version of the tool tip is clamped into a tool holder recess in similar manner to that described in connection with Figures 3 and 4 and is both indexible and reversible. Although the embodiments of tip described are of generally triangular form, it will be appreciated that other forms of tool tip are possible embodying the principles of the invention, examples being square and hexagonal. In all cases, the recess S would have a number of sides corresponding to the number of cutting edges provided to enable the tool tip to be clamped in a tool holder with any one of the cutting edges in an operational position. Such alternative forms of tool tip could also be made reversible by providing a clamping recess on both sides thereof, and the invention may be applied to tool tips designed either for external or internal machining operations. WHAT WE CLAIM IS:
1. A tool tip having a plurality of peripherally spaced projecting cutting edges, and a polygonally shaped recess in a major face thereof, the recess having a number of faces corresponding to the number of cutting edges, each of which faces extends in a direction generally perpendicular to the direction of projection of a respective one of the cutting edges, said faces being arranged for co-opertion with clamping means for clamping the tip in operative position in a tool holder.
2. A tool tip according to Claim 1 which is generally polygonal and has a cutting edge in the vicinity of each of its apices.
3. A tool tip according to Claim 1 or Claim 2 wherein the tool tip is generally triangular.
4. A tool tip according to any one of the preceding Claims having a plurality of peripheral sides corresponding to the number of cutting edges, said sides being arranged for engagement singly with a supporting surface of a tool holder, the peripheral sides and the faces of the recess being arranged so that when a clamping force is applied to a face of the recess, a component of the force acts to resist disengagement of the corresponding peripheral side and supporting surface.
5. A tool tip according to any one of Claims 1 to 4 wherein the recess faces are inclined with respect to said major face.
6. A tool tip according to any one of the preceding claims wherein a recess is provided in each major surface of the tip and the cutting edges of the tip are arranged to enable the tip to be reversed.
7. A cutting tool tip substantially as hereinbefore described with reference to Figures 1 and 2 and Figures 5 and 6 of the accompanying drawings.
8. A combination of a tool tip according to any one of the preceding Claims and a tool holder the holder having a recess with a base and a pair of mutually angled sides with which latter a pair of corresponding sides of the tip are engaged, and clamping means engaged with a face of said tip recess and arranged to urge the tip against said base and against both of said sides of the holder recess.
9. A combination according to Claim 8 wherein the faces of the recess are inclined with respect to said major face and the clamping member has a clamping surface inclined in a manner corresponding to the inclination of said faces and engaging one of said faces.
10. A combination according to Claim 8 or Claim 9 wherein the clamping means has
a further surface inclined in a generally opposite direction to said clamping surface, said further surface engaging with an inclined surface on the holder in such a manner as to provide additional resistance to cutting forces to which the tool tip is subjected in use.
11. A combination of a cutting tool tip and tool holder, substantially as hereinbefore described with reference to Figures 3 and 4 of the accompanying drawings.
GB4426775A 1976-10-20 1976-10-20 Tool tip Expired GB1567004A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4426775A GB1567004A (en) 1976-10-20 1976-10-20 Tool tip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4426775A GB1567004A (en) 1976-10-20 1976-10-20 Tool tip

Publications (1)

Publication Number Publication Date
GB1567004A true GB1567004A (en) 1980-05-08

Family

ID=10432512

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4426775A Expired GB1567004A (en) 1976-10-20 1976-10-20 Tool tip

Country Status (1)

Country Link
GB (1) GB1567004A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0074601A1 (en) * 1981-09-15 1983-03-23 Feldmühle Aktiengesellschaft Cutting tool
EP0075177A1 (en) * 1981-09-15 1983-03-30 Feldmühle Aktiengesellschaft Cutting tool
EP0117400A1 (en) * 1983-02-01 1984-09-05 Fried. Krupp Gesellschaft mit beschränkter Haftung Nonagonal indexable cutting insert
EP0119175A1 (en) * 1983-03-15 1984-09-19 Santrade Ltd. Thread cutting insert
US4602897A (en) * 1984-04-25 1986-07-29 Iscar Metals, Inc. Cutting insert and grooving cutter
US4674924A (en) * 1984-10-10 1987-06-23 Santrade Ltd. Single-sided cutting insert
US5098232A (en) * 1983-10-14 1992-03-24 Stellram Limited Thread cutting tool
WO1998030349A1 (en) * 1996-12-23 1998-07-16 Sandvik Aktiebolag (Publ) Cutting insert and holder for metal cutting machining
WO2003013770A1 (en) * 2001-07-26 2003-02-20 Ceramtec Ag Innovative Ceramic Engineering Metal cutting tool and cutting plate provided in the shape of a donut
US7073986B2 (en) 2001-11-08 2006-07-11 Kennametal Inc. Dimpled insert with retaining clamp
US7320563B2 (en) * 2002-08-28 2008-01-22 Ceramtec Ag, Innovative Ceramic Engineering Two-cavities cutting matrix
US9174279B2 (en) 2011-12-14 2015-11-03 Iscar, Ltd. Indexable cutting insert and cutting tool therefor
US11504777B2 (en) * 2017-03-22 2022-11-22 Ceramtec Gmbh Tool system

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0074601A1 (en) * 1981-09-15 1983-03-23 Feldmühle Aktiengesellschaft Cutting tool
EP0075177A1 (en) * 1981-09-15 1983-03-30 Feldmühle Aktiengesellschaft Cutting tool
EP0117400A1 (en) * 1983-02-01 1984-09-05 Fried. Krupp Gesellschaft mit beschränkter Haftung Nonagonal indexable cutting insert
EP0119175A1 (en) * 1983-03-15 1984-09-19 Santrade Ltd. Thread cutting insert
US5098232A (en) * 1983-10-14 1992-03-24 Stellram Limited Thread cutting tool
US4602897A (en) * 1984-04-25 1986-07-29 Iscar Metals, Inc. Cutting insert and grooving cutter
US4674924A (en) * 1984-10-10 1987-06-23 Santrade Ltd. Single-sided cutting insert
WO1998030349A1 (en) * 1996-12-23 1998-07-16 Sandvik Aktiebolag (Publ) Cutting insert and holder for metal cutting machining
WO2003013770A1 (en) * 2001-07-26 2003-02-20 Ceramtec Ag Innovative Ceramic Engineering Metal cutting tool and cutting plate provided in the shape of a donut
US20120195702A1 (en) * 2001-07-26 2012-08-02 Otto Eder Metal cutting tool and cutting plate provided in the shape of a donut
US8388273B2 (en) 2001-07-26 2013-03-05 Ceramtec Gmbh Metal cutting tool and cutting plate provided in the shape of a donut
US9227248B2 (en) 2001-07-26 2016-01-05 Ceramtec Gmbh Metal cutting tool and cutting plate provided in the shape of a donut
US9744598B2 (en) * 2001-07-26 2017-08-29 Ceramtec Gmbh Metal cutting tool and cutting plate provided in the shape of a donut
US7073986B2 (en) 2001-11-08 2006-07-11 Kennametal Inc. Dimpled insert with retaining clamp
USRE45536E1 (en) 2001-11-08 2015-06-02 Kennametal Inc. Dimpled insert with retaining clamp
US7320563B2 (en) * 2002-08-28 2008-01-22 Ceramtec Ag, Innovative Ceramic Engineering Two-cavities cutting matrix
US9174279B2 (en) 2011-12-14 2015-11-03 Iscar, Ltd. Indexable cutting insert and cutting tool therefor
US9656325B2 (en) 2011-12-14 2017-05-23 Iscar, Ltd. Indexable cutting insert and cutting tool therefor
US11504777B2 (en) * 2017-03-22 2022-11-22 Ceramtec Gmbh Tool system

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee