GB2070472A - Disposable tool tip for cutting a screw-thread or groove - Google Patents
Disposable tool tip for cutting a screw-thread or groove Download PDFInfo
- Publication number
- GB2070472A GB2070472A GB8105671A GB8105671A GB2070472A GB 2070472 A GB2070472 A GB 2070472A GB 8105671 A GB8105671 A GB 8105671A GB 8105671 A GB8105671 A GB 8105671A GB 2070472 A GB2070472 A GB 2070472A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tip
- tooth
- holder
- faces
- pair
- 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.)
- Granted
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
- B23B27/1614—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 against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the insert
-
- 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
- B23B27/06—Profile cutting tools, i.e. forming-tools
- B23B27/065—Thread-turning tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/12—Side or flank surfaces
- B23B2200/123—Side or flank surfaces curved
Abstract
A disposable tool tip cuts a screw-thread or groove in a workpiece. The tip 1 has a pair of flat parallel faces 2, a pair of parallel side edges 4, 5 perpendicular to the faces and, extending along each of a pair of parallel end edges perpendicular to both the side edges and the faces, a tooth 6, 7 having a profile of outwardly-convergent shape complementary to the shape of the thread form or groove to be cut. Each tooth 6, 7 has at each end thereof adjacent a respective side edge of the tip, a cutting edge extending around the profile of the tooth, to provide four cutting edges 10, 11 on the tip. The tip is symmetrical about each of three orthogonal planes containing respective centre-lines of the tip, whereby a selected one of the four cutting edges 10, 11 can be selected for use. Each tooth may have a central notch 8, 9 to engage a locating pin in a tool holder. The pin and a frusto-conical headed fixing screw retain the tip in position. <IMAGE>
Description
SPECIFICATION
Disposable tool tip for cutting a screw-thread or groove
The invention relates to a disposable tool tip for cutting a screw-thread or groove in a workpiece.
Disposable or "thrnw-away" tool tips for cutting a screw-thread have been proposed hitherto but the known tips have a maximum of three cutting edges. An object of the present invention is to provide such a tip which has four cutting edges and which can be mounted quickly and accurately in any one of four cutting positions, a different cutting edge being used in each said position. By providing such a tip it has a longer useful life. This object of the invention is solved by making a tip symmetrical in three orthogonal planes, each containing a centre-line of the tip.An advantage of this is that the tip is symmetrical in a plane extending centrally through its cutting teeth and so the flanks of each tooth can be ground in one operational pass, whereas in tips proposed hitherto having cutting teeth which were not centrally arranged on the tips a multiplicity of grinding passes were required to form the teeth.
According to the invention, a disposable tool tip, for cutting a screw-thread or groove in a workpiece, has a pair of flat parallel faces, a pair of parallel side edges perpendicular to said faces and, extending along each of a pair of parallel end edges perpendicular to both said side edges and said faces, a tooth having a profile of outwardlyconvergent shape complementary to the shape of the thread form or groove to be cut, each tooth having at each end thereof adjacent a respective side edge of the tip, a cutting edge extending around the profile of the tooth, thereby to provide four cutting edges on the tip, the tip being symmetrical about each of three orthogonal planes containing respective centre-lines of the tip, whereby a selected one of the four cutting edges can be selected for use by securing the tip on a holder therefor by locating an appropriate face and an edge or other part of the periphery of the tip in abutment with corresponding faces or other abutment surfaces on the holder and clamping the tip to the holder.
Each tooth may be divided into two parts by a notch extending inwardly of the tooth.
The tip may be of substantially rectangular or square shape in plan, the teeth being formed on one pair of opposite sides thereof and said side edges being formed by the other pair of opposite sides thereof.
The invention also includes the combination of the tip as set out in any one of the immediately preceding three paragraphs and a tool holder therefor, the tool holder having a flat seating face to be abutted, in use, by one or other of said faces of the tip, and, upstanding from the seating face, at least one other seating surface to be abutted by an appropriate side edge, a tooth or another part of the periphery of the tip.
By way of example, two alternative tips in accordance with the invention, and tool holders therefor, are now described by way of example with reference to the accompanying drawings, in which:
Figure 1 is a plan view of the first tip for use as an external screw-thread or groove-cutting tool;
Figure 2 is a view in the direction of arrow II in
Figure 1;
Figure 3 is a plan view of the tip shown in
Figure 1 in a recess in a tool holder therefor;
Figure 4 is a view in the direction of the arrow
IV in Figure 3 of the tool holder and tip;
Figure 5 is a plan view of the second tip which is a modification of the first tip as shown in
Figure 1.
The first tip 1 shown in Figures 1 and 2 is substantially rectangular in plan as shown in
Figure 1 or it may be substantially square. The tip has parallel flat faces 2, 3; parallel flat side edges 4, 5 and parallel end edges on each of which is formed an outwardly-directed tooth 6, 7 of crosssectional shape complementary to the shape of the screw-thread form or groove cross-section to be cut. The tip 1 is symmetrical about three orthogonal planes containing the centre-lines XX,
W and ZZ, shown in Figures 1 and 2. Each tooth 6, 7 is divided into two portions by a notch 8, 9 cut through the respective tooth along the centreline XX. The purpose of the notches 8, 9 are to prevent a fracture of one portion of a tooth spreading along the length of the tooth to the other portion thereof.The ends 10, 1 1 of each tooth 6, 7 are formed with a required rake angle and having a cutting edge extending around the profile of the respective tooth. As the tip is symmetrical about the planes containing the centre-lines XX, XY and ZZ it can be mounted in four alternative positions on a holder to enable each of the four cutting edges 10, 1 1 to be used in turn to cut a thread or groove of profile complementary to that of the tooth 6, 7. As the tip is symmetrical about the plane containing the centre-line ZZ, the flanks of the tooth can each be ground in turn, or two or more simultaneously, in a single pass. The tip may be clamped to a tool holder in any convenient manner.Preferably the tip is held in position by a frusto-conical headed screw inserted through a double-ended frustoconical hole 12 formed about an axis 00 perpendicular to the centre-lines XX, YY at their point of intersection, as indicated in Figures 1 and 2.
Figures 3 and 4 show the tip of Figures 1 and 2 clamped in a recess in the tool holder 13. The recess has a flat locating face 14 and two flat faces 1 5, 16 at right angles to each other and upstanding from the face 14. The tip 1 is clamped by the screw 17 with one or other of the faces 2 and 3 abutting the face 14 and with one or other of the side edges 4 and 5 abutting the upstanding face 15. The tool holder has an internally screwthreaded socket 18 therein open to the face 14 to receive the screw 17. The longitudinal axis of the socket 18 is offset towards the intersection of the faces 15 and 16 with respect to the longitudinal axis of the hole 1 2 in the tip so that as the screw 1 7 is tightened to grip the tip 1 against the face 14, the tip is pulled into engagement with the face 1 5 and towards the face 16.The crests of the tooth portions 6 or 7, according to the orientation of the tip, are either pulled into engagement with the face 16, or in the tool holder illustrated, the tip 1 is pulled by the screw 17 until the notch 8 or 9 is located around a locating pin 19 upstanding from the face 14 of the recess in the tool holder 13. Where the locating pin 19 is not provided and the crests of the appropriate tooth portions abut the face 16 the tooth profile is protected from damage by being shielded along almost the whole length of the tooth portions by the face 1 6.An advantage of using the frusto-conical headed screw 17 to hold the tip 1 in position, compared with, for example, an external type of clamping bridge, is that the screw 17 will hold the tip rigidly in position whether the reaction on the cutting edge tends to push the tip towards the face 14 or tends to pull the tip away from the face 14. As the tooth profile is symmetrical about the plane containing the centre-line 22, the tip can be used for cutting left or right handed screw-threads.
In the position shown in Figure 3 the cutting edge 10 or 1 1 at A is used to cut the thread or groove. By removing the screw 17 and reorienting the tip of turning it over in the recess and reclamping with the screw 1 7 any one of the other three cutting edges 10, 1 1 can be brought into use. The holder may be mounted for any external cutting operation. For example, it may be mounted on a tool post of a lathe.
The second tip shown in Figure 5 is identical with the first tip as shown in Figure 1 except that the notches 8, 9 are not provided in the teeth 6, 7.
Thus each tooth 6, 7 is continuous and is of constant cross-section of shape complementary to the cross-section of the required screw-thread along its whole length.
Claims (10)
1. A disposable tool tip, for cutting a screwthread or groove in a workpiece, has a pair of flat parallel faces, a pair of parallel side edges perpendicular to said faces and, extending along each of a pair of parallel end edges perpendicular to both said side edges and said faces, a tooth having a profile of outwardly-convergent shape complementary to the shape of the thread form or groove to be cut, each tooth having at each end thereof adjacent a respective side edge of the tip, a cutting edge extending around the profile of the tooth, thereby to provide four cutting edges on the tip, the tip being symmetrical about each of three orthogonal planes containing respective centrelines of the tip, whereby a selected one of the four cutting edges can be selected for use by securing the tip on a holder therefor by locating an appropriate face and an edge or other part of the periphery of the tip in abutment with corresponding faces or other abutment surfaces on the holder and clamping the tip to the holder.
2. A disposable tool tip as claimed in Claim 1 in which each tooth is divided into two parts by a notch extending inwardly of the tooth.
3. A disposable tool tip as claimed in Claim 1 or 2 which is substantially rectangular or square shape in plan, the teeth being formed on one pair of opposite sides thereof and said side edges being formed by the other pair of opposite sides thereof.
4. A disposable tool tip as claimed in any preceding claim in combination with a tool holder therefor, the tool holder having a flat seating face to be abutted, in use, by one or other of said faces of the tip, and, upstanding from the seating face, at least one other seating surface to be abutted by an appropriate side edge, a tooth or another part of the periphery of the tip.
5. The combination as claimed in Claim 4 in which the or one of said other seating surfaces is formed by part of the peripheral surface of a pair upstanding from said flat seating face of the tool holder.
6. The combination as claimed in Claim 4 or 5 in which the tool holder is a block in which the flat seating face is formed in a recess in a surface of the block.
7. The combination as claimed in Claim 4 or 5 in which the tool holder is a bar in which the flat seating face is formed by the base of a slot or recess formed in any end face of the bar.
8. The combination as claimed in any one of
Claims 4-7 in which the tip has a central hole formed therein having its longitudinal axis perpendicular to the planes of said faces and the holder has an internally screw-thread socket of which the longitudinal axis is nearer to said other seating surface than the longitudinal axis of the tip is to the corresponding side edge, tooth or other part of the periphery of the tip, and the tip is arranged to be secured to the holder by a screw passed through the hole in the tip and engaged with the socket in the holder, whereby on tightening the screw, the tip is pulled into tight abutment with said other seating surface.
9. The combination as claimed in Claim 8 in which the head of the screw and the hole in the tip are frusto-conical.
10. A disposable tool tip constructed and arranged substantially as described herein with reference to Figures 1 and 2; Figures 3 and 4 or
Figure 5 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8105671A GB2070472B (en) | 1980-02-26 | 1981-02-23 | Disposable tool tip for cutting a screwthread or groove |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8006392 | 1980-02-26 | ||
| GB8105671A GB2070472B (en) | 1980-02-26 | 1981-02-23 | Disposable tool tip for cutting a screwthread or groove |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2070472A true GB2070472A (en) | 1981-09-09 |
| GB2070472B GB2070472B (en) | 1983-06-02 |
Family
ID=26274610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8105671A Expired GB2070472B (en) | 1980-02-26 | 1981-02-23 | Disposable tool tip for cutting a screwthread or groove |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2070472B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0179033A2 (en) * | 1984-09-26 | 1986-04-23 | Santrade Ltd. | Cutting tool |
| EP0268001A2 (en) * | 1986-11-20 | 1988-05-25 | Montanwerke Walter Gmbh | Turning tool with an indexable insert for grooving or thread cutting |
| EP0439317A2 (en) * | 1990-01-23 | 1991-07-31 | Roger Warren Little | Threading insert |
| US5203648A (en) * | 1989-05-31 | 1993-04-20 | Bohannan Richard D | Indexable insert for thread cutting and slotting |
| US20100202844A1 (en) * | 2009-02-09 | 2010-08-12 | Hsin-Tien Chang | Combination of Center Drill and Drill Holding Tool |
| US20110058907A1 (en) * | 2009-09-09 | 2011-03-10 | Kennametal Inc. | High speed milling cutter with tapered pin |
| US20110076106A1 (en) * | 2009-09-25 | 2011-03-31 | Kennametal Inc. | Cutting tool with error proofing feature |
| US20120099935A1 (en) * | 2010-10-20 | 2012-04-26 | Iscar, Ltd. | Cutting Tool and Cutting Insert Therefor |
| CN102695573A (en) * | 2010-01-07 | 2012-09-26 | Gkn烧结金属有限公司 | Machining tool and method for manufacturing same |
| DE102011007076A1 (en) * | 2011-04-08 | 2012-10-11 | Walter Ag | Indexable insert and indexable insert holder |
| US20150290717A1 (en) * | 2014-04-10 | 2015-10-15 | Iscar, Ltd. | Cutting tool and cutting insert having exactly four cutting portions therefor |
| TWI508801B (en) * | 2013-03-11 | 2015-11-21 | Hiwin Tech Corp | Blade and tool for applying the blade |
| US9623493B2 (en) | 2008-11-19 | 2017-04-18 | Kennametal Inc. | Double-sided ball end mill cutting insert and tool therefor |
-
1981
- 1981-02-23 GB GB8105671A patent/GB2070472B/en not_active Expired
Cited By (35)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0179033A2 (en) * | 1984-09-26 | 1986-04-23 | Santrade Ltd. | Cutting tool |
| US4632606A (en) * | 1984-09-26 | 1986-12-30 | Santrade Limited | Cutting tool and cutting insert |
| EP0179033A3 (en) * | 1984-09-26 | 1987-07-15 | Santrade Ltd. | Cutting tool and cutting insert |
| EP0268001A2 (en) * | 1986-11-20 | 1988-05-25 | Montanwerke Walter Gmbh | Turning tool with an indexable insert for grooving or thread cutting |
| EP0268001A3 (en) * | 1986-11-20 | 1989-09-06 | Montanwerke Walter Gmbh | Turning tool with an indexable insert for grooving or thread cutting |
| US4890961A (en) * | 1986-11-20 | 1990-01-02 | Montanwerke Walter Gmbh | Lathe tool equipped with reversible plates for cutting grooves or threads |
| US5203648A (en) * | 1989-05-31 | 1993-04-20 | Bohannan Richard D | Indexable insert for thread cutting and slotting |
| EP0439317A3 (en) * | 1990-01-23 | 1992-03-04 | Roger Warren Little | Threading insert |
| EP0439317A2 (en) * | 1990-01-23 | 1991-07-31 | Roger Warren Little | Threading insert |
| US9623493B2 (en) | 2008-11-19 | 2017-04-18 | Kennametal Inc. | Double-sided ball end mill cutting insert and tool therefor |
| US20100202844A1 (en) * | 2009-02-09 | 2010-08-12 | Hsin-Tien Chang | Combination of Center Drill and Drill Holding Tool |
| US8192114B2 (en) * | 2009-02-09 | 2012-06-05 | Hsin-Tien Chang | Combination of center drill and drill holding tool |
| US8388272B2 (en) * | 2009-09-09 | 2013-03-05 | Kennametal Inc. | High speed milling cutter with tapered pin |
| US20110058907A1 (en) * | 2009-09-09 | 2011-03-10 | Kennametal Inc. | High speed milling cutter with tapered pin |
| US20110076106A1 (en) * | 2009-09-25 | 2011-03-31 | Kennametal Inc. | Cutting tool with error proofing feature |
| US8858126B2 (en) * | 2009-09-25 | 2014-10-14 | Kennametal Inc. | Cutting tool with error proofing feature |
| CN102695573B (en) * | 2010-01-07 | 2015-05-06 | Gkn烧结金属有限公司 | Machining tool and method for manufacturing same |
| CN102695573A (en) * | 2010-01-07 | 2012-09-26 | Gkn烧结金属有限公司 | Machining tool and method for manufacturing same |
| US9242299B2 (en) | 2010-01-07 | 2016-01-26 | Gkn Sinter Metals, Llc | Machining tool and method of manufacturing same |
| EP3195963A1 (en) * | 2010-10-20 | 2017-07-26 | Iscar Ltd. | Cutting insert |
| US20120099935A1 (en) * | 2010-10-20 | 2012-04-26 | Iscar, Ltd. | Cutting Tool and Cutting Insert Therefor |
| US8678718B2 (en) | 2010-10-20 | 2014-03-25 | Iscar, Ltd. | Cutting tool and cutting insert therefor |
| WO2012052984A1 (en) * | 2010-10-20 | 2012-04-26 | Iscar Ltd. | Cutting tool and cutting insert therefor |
| US20140050542A1 (en) * | 2011-04-08 | 2014-02-20 | Walter Ag | Indexable Cutting Insert and Indexable Cutting Insert Holder |
| JP2014509956A (en) * | 2011-04-08 | 2014-04-24 | バルター アクチェンゲゼルシャフト | Blade-tip replaceable insert and blade-tip replaceable insert holder |
| WO2012136600A1 (en) * | 2011-04-08 | 2012-10-11 | Walter Ag | Indexable cutting insert and indexable cutting insert holder |
| CN103459069A (en) * | 2011-04-08 | 2013-12-18 | 瓦尔特公开股份有限公司 | Indexable cutting insert and indexable cutting insert holder |
| CN103459069B (en) * | 2011-04-08 | 2016-05-18 | 瓦尔特公开股份有限公司 | Indexable cutting inserts and Indexable cutting inserts frame |
| DE102011007076A1 (en) * | 2011-04-08 | 2012-10-11 | Walter Ag | Indexable insert and indexable insert holder |
| US9457409B2 (en) | 2011-04-08 | 2016-10-04 | Walter Ag | Indexable cutting insert and indexable cutting insert holder |
| TWI508801B (en) * | 2013-03-11 | 2015-11-21 | Hiwin Tech Corp | Blade and tool for applying the blade |
| US20150290717A1 (en) * | 2014-04-10 | 2015-10-15 | Iscar, Ltd. | Cutting tool and cutting insert having exactly four cutting portions therefor |
| CN106457409A (en) * | 2014-04-10 | 2017-02-22 | 伊斯卡有限公司 | Cutting tool and cutting insert having exactly four cutting portions therefor |
| US9421615B2 (en) * | 2014-04-10 | 2016-08-23 | Iscar, Ltd. | Cutting tool and cutting insert having exactly four cutting portions therefor |
| CN106457409B (en) * | 2014-04-10 | 2018-10-19 | 伊斯卡有限公司 | Cutting element and the cutting insert with just four cutting tips for the cutting element |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2070472B (en) | 1983-06-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 20010222 |