GB2083386A - Tool holder and edge tool bit - Google Patents
Tool holder and edge tool bit Download PDFInfo
- Publication number
- GB2083386A GB2083386A GB8120251A GB8120251A GB2083386A GB 2083386 A GB2083386 A GB 2083386A GB 8120251 A GB8120251 A GB 8120251A GB 8120251 A GB8120251 A GB 8120251A GB 2083386 A GB2083386 A GB 2083386A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tool
- passage
- tool bit
- bit
- tool holder
- 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
- B23B27/08—Cutting tools with blade- or disc-like main parts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
An edge tool comprises a tool holder and a replaceable tool bit. The tool holder body has a first passage extending inwardly from an end face in which the tool bit (13) is to be mounted. A second passage (15, 115) extends transversely to said first passage. A locking member, mounted in the second passage, has an eccentric part (20, 120) which engages a surface of the tool bit or acts on it via an intermediate body 121 to apply thereto a locking force from the locking member. The bit is forced against the wall of the first passage during locking. The bit has between cutting ends a part-circular shank with a flat or V-shaped surface. <IMAGE>
Description
SPECIFICATION
Edge tools
This invention relates to edge tools such as parting, boring, turning or like tools.
An object of the invention is to provide a new and improved edge tool.
According to one aspect of the invention, we provide a tool holder, for use in an edge tool comprising an assembly of tool holder and replaceable tool bit having an operative working end, the tool holder having a body with a first passage extending inwardly from an end face of the body in which the tool bit is to be mounted so as to have said working end projecting from one end of said passage, a second passage extending transversely to said first passage, a locking member mounted in the second passage, means to engage said body part of the tool bit to apply thereto a locking force from the locking member, said locking member being movable between a free position, wherein the tool bit can be withdrawn from said first passage, and a locking position in which the tool bit is secured in the first passage by being forced against the wall of the first passage.
The locking member may be in the form of a rotatable cam.
The second passage may be of circular cross-section and the locking member of generally cylindrical form with a part thereof constituting the cam being also cylindrical but being eccentric in relation to the remainder of the cylindrical form of the locking member so that a simple rotary movement of the locking member is all that is required to move it between its free position and its locking position.
The tool holder may be generally elongate and said first passage extend generally parallel to the longitudinal axis of the tool holder.
Said means to engage said body part may comprise a part of the locking member to directly engage the tool bit.
Said second passage may intersect said first passage so that, in use, part of the surface of the tool bit within the first passage projects into the second passage and said locking member being mounted in the second passage so as to engage said part of the surface of the tool bit in the manner of a wedge.
The tool holder may include a third passage which intersects the first passage so that, in use, an end part of the tool bit opposite to said operative end projects into the third passage and engages an abutment provided therein so as to limit movement of the tool bit inwardly of the first passage.
The tool holder may be of generally rectangular right-parallelopiped shape.
Alternatively, said means to engage said body part may comprise an intermediate member adapted to be engaged by the locking member and thereby to be urged into engagement with the tool bit.
The intermediate member may be provided in a recess in the tool holder which extends between, and is in communication with, said first and second passages.
The recess may comprise a groove extending inwardly from the end face of the tool.
The intermediate member may be provided with a recess in which the locking member is received and engages the wall of the recess to move the intermediate member into locking engagement with the tool bit.
The tool holder may be generally cylindrical and preferably is of stepped cylindrical configuration.
According to a second aspect of the invention, we provide an edge tool comprising an assembly of tool holder according to the first aspect of the invention and a replaceable tool bit having an operative working end, the tool bit being mounted in said first passage so as to have said working end projecting from one end of said passage, and said means engaging said body part of the tool bit to apply thereto a locking force from the locking member so that the tool bit is secured in the first passage by being forced against the wall of the first passage.
The tool bit is preferably made of steel and the operative working end is coated with titanium or other hard material.
By making the tool bit of steel, it is prP vided with adequate strength to avoid failure in use, even though said working end is carried at the end of a part of the tool bit which which may be mounted in cantilever in the tool holder. The titanium or other hard coating gives the working end adequate hardness to have an adequately long service life.
The working end may comprise a cutting edge.
The tool bit may have a working end at each of two opposite ends thereof.
Said means engaging said body part may comprise a part of the locking member in direct engagement with the tool bit.
The first passage may be of circular crosssection and the part of the surface of the tool bit which is engaged by said locking member may be of part circular cross-section with a chordal planar surface which is in a plane parallel to the axis of the bit.
The or each working end may have a cut- ting edge parallel to said plane and transverse to the longitudinal axis of the tool holder.
The tool holder may be provided with a support portion projecting from said end face to provide a backing support for the projecting part of the tool bit.
Alternatively, said means may comprise an intermediate member engaged by the locking member and urged into engagement thereby with the tool bit.
The tool bit may have a surface adapted to engage with the intermediate member so as to prevent rotation of the tool bit relative to the intermediate member.
The first passage may be generally cylindrical and the tool bit having an external surface part of which is of generally cylindrical configuration and part of which is of generally Vsection channel configuration, the intermediate member having a projecting V-shaped portion adapted to engage within said Vsection channel thereby to prevent rotation of the tool bit in the first passage.
The or each working end may have a cutting edge extending generally parallel to said longitudinal axis.
The operative working end of the tool bit may be mounted solely in cantilever in the tool holder without any backing support.
According to a third aspect of the invention, we provide a tool bit, for use in an edge tool comprising an assembly of tool holder and replaceable tool bit having an operative working end, the tool bit comprising a body having a cross-section including a portion which is part-circular and a portion which is chordal so as to provide a planar surface, there being a working end at least at one end of the body.
The tool bit may have a working end at each of two opposite ends of the body.
The tool bit may have a cutting edge at the or each working end which lies in a plane parallel to that of said planar portion of the body and extending transverse to the longitudinal axis of the body.
According to a fourth aspect of the invention, we provide a tool bit, for use in an edge tool comprising an assembly of tool holder and replaceable tool bit having an operative working end, the tool bit having a crosssection including a portion which is partcircular and a portion which is of generally Vsection channel configuration, and there being a working end at least at one end of the body.
The tool bit may have a working end at each of two opposite ends of the body.
The tool bit may have a cutting edge at the or each working end which extends parallel to the longitudinal axis of the body.
Two embodiments of the invention are illustrated by way of example in the accompanying drawings, wherein: Figure 1 is a view in side elevation of one embodiment of the invention showing a tool holder and tool bit in position in the holder;
Figure 2 is a fragmentary section on the line 2-2 of Fig. 4;
Figure 3 is a perspective view of the tool bit of Fig. 1;
Figure 4 is a fragmentary section on the line 4-4 of Fig. 1;
Figure 5 is a view in side elevation of a second embodiment of the invention showing a tool holder and tool bit in position;
Figure 6 is a fragmentary section on the line 6-6 of Fig. 5;
Figure 7 is a prespective view of the tool bit of Fig. 5; and
Figure 8 is a fragmentary section on the line 8-8 of Fig. 5.
Referring to Fig. 1, a tool holder shown is therein and has a rectangular in cross-section shank 10 and body part 11 having a forwardly projecting flange 12 of reduced sec tion which forms a backing support for the operative end 13 of a tool bit when this is mounted in position in the holder as shown in
Fig. 1.
Referring now to Figs. 2 and 4, the body part 11 of the tool holder is provided with a first passage 14 which is of circular crosssection and which extends in the direction of the longitudinal axis of the tool holder but inclined at an acute angle thereto so that when the tool bit is mounted in position the operative end 13 has the appropriate top rake angle. As shown in Fig. 3, a suitable tool bit is made from circular cross-section bar and is conveniently of doubleended form having two opposite ends so that it can be reversed to bring the unused end into use after one end has become worn. The central part of the tool bit is a shank 16 which is of part circular form and has a flat face 17 which is for a purpose hereinafter described.
The tool bit is a parting tool in the present example and consequently the working ends, which have a cutting edge E lying parallel to the plane of the face 17 and transverse to the longitudinal axis of the tool bit, are relatively thin in order to reduce to the minimum possible the amount of metal removed during a parting operation. The tool bit is made of high speed steel to provide it with adequate strength bearing in mind the relatively thin parts thereof on which the cutting edges E are provided and, to give the cutting edges E an adequately long life, the tool is coated with titanium.
The body part 11 has a second passage 15 of circular cross-section which extends through the body part transversely from side to side thereof and is positioned so that, as shown in Figs. 2 and 4, it intersects the passage 14 so that when the tool holder is mounted in position in the passage 14 part of the flat surface 17 of the shank 15 projects into the transverse passage 15.
A locking member which is indicated generally at 18 is mounted in the transverse passage 15 and is of generally cylindrical form corresponding to the cross-section of the passage 15. The two end parts 19 of the locking member are of similar cylindrical form and are a rotatable fit in the transverse passage 15 whilst the central part 20 between the two end parts 19 is of circular cross-section as shown in Fig. 2 but its central axis is offset in relation to the central axis of the end part 19 so that this part 20 is eccentric in relation to the end part 19 and in relation to the trans verse passage 15.Hence the part 20 constitutes a cam with its edge profile adapted to engage the flat face 17 of the tool bit when this is mounted in position in the passage 14 and as shown in Figs. 2 and 4 the locking member is in the free position in which no wedging pressure is applied to the flat face 17 so that the tool bit can be easily removed from and replaced in the passage 14. A further transverse passage 21 is provided in the body part 11 and this passage intersects the end of the passage 14 so that when the tool bit is secured in position the end of the tool bit which is not in use projects into the transverse passage 21 within which is fitted a back stop in the form of a peg 22 to be engaged by the end face of the tool bit within the passage 21.
One end part 19 of the locking member is provided with a socket recess into which can be inserted a key to enable the locking member to be given a rotary movement. After the tool bit has been inserted in position as shown in the drawings, the locking member is turned so as to rotate its eccentric part 20 into engagement with the flat face 17 of the tool bit and wedge the part 16 of the tool bit into secure engagement with the wall of the passage 14.The line of the operative cutting edge is parallel to the plane of the flat face 17 so that if the tool bit is inserted into the passage 14 with the line of the cutting edge not correctly orientated in relation to the holder 10, then the flat face 17 will itself not be in the correct position but as soon as the locking member 20 is rotated from its free position the engagement between the eccentric part 20 and the flat face 17 will bring about a slight rotary movement of the tool bit within the passage 14 until the flat face 17 is brought into the correct position as shown in
Fig. 4.
In the event of the tendency of a tool bit to remain stuck in the passage 14 after a period of use, it can be easily freed by inserting the end of a rod into the passage 21 to exert force against the end of the tool bit projecting into the passage 21.
Referring now to Figs. 5 to 8, the tool holder shown therein has a cylindrical shank 110 and a body part 111 also cylindrical but of greater diameter than the shank 1 10. The body part 111 is provided with a first passage 114 which is of cylindrical configuration and extends in a direction parallel to the longitudinal axis of the tool holder. The body part 111 has a second passage 115 therein also of cylindrical configuration which extends through the body part transversely from side to side thereof and is positioned so that, as shown in Figs. 6 and 8, it is connected in communication with the first passage 11 4 by means of an intermediate recess 100 in the form of a rectangular groove or slot formed in the body part extending inwardly from a front surface 101 thereof at which the first passage 114 terminates.
A locking member 118 is mounted in the transverse second passage 115 and comprises an end part 119 of cylindrical form and a rotatable fit in the passage 115, a second end part 11 9a formed with a screw thread in screw-threaded engagement with a threaded part 11 spa of the passage 115 and a central part 120 between the two ends parts which is of cylindrical configuration but with its central axis off-set in relation to the central axis of the end parts 119, 11 9a so that the central part 120 is eccentric in relation to the end parts 119, 11 9a and in relation to the transverse passage 115.Hence the part 120 constitutes a cam with its edge profile adapted to engage within a cylindrical passage 117 of an intermediate member 121 of generally rectangular configuration slidably engaged in the recess 100.
At its inner end, the intermediate member 121 has an end surface 122 of V-shape in cross-section adapted to engage a V-section channel-shaped part 123 of the body part 124 of the tool bit 125.
In Figs. 6 and 8, the locking member 118 is shown in a "free" position in which no pressure is applied to the surface 123 of the tool bit, so that the tool bit can be easily removed from and replaced in the passage 114.
One end part 11 9a of the locking member is provided with a socket recess 126 into which can be inserted a key to enable the locking member to be given a rotary move ment. After the tool bit has been inserted in position as shown in the drawings, the locking member 118 is turned so as to rotate its eccentric part 120 into engagement with the surface of the bore 117 of the intermediate member 121 so as to cause the intermediate member 121 to be moved into locking engagement with the tool bit and thus clamp the tool bit into position by virtue of being clamped between the surface 122 of the intermediate member 121 and the opposed portion of the wall of the part-circular portion of the first passage 114.
Because of the V-shaped configuration of the surfaces 122 and 123, rotation of the tool bit within the passage 114 is prevented.
The tool bit has a cutting edge 124, which extends generally parallel to the longitudinal axis of the body, and contoured to cut a form of a complementary configuration on a cylindrical surface within which the tool bit is located, and into cutting engagement with which it is moved by a feed motion applied to the tool holder in a direction generally trans verse to the longitudinal axis of the tool holder, by an auto lathe in which it is incorporated.
As in the first embodiment, the tool bit is made of high speed steel to provide it with adequate strength bearing in mind the relatively thin section thereof necessary to permit it to be engaged within a cylindrical surface of relatively small diameter, and which requires the working end of the tool bit to be mounted in the tool holder in cantilever. In addition, at least the cutting edge, as in the present example the whole tool bit, is coated with titanium to give the cutting edge an adequately long life.
If desired, in both embodiments, the tool bit may be made of material other than high speed steel so long as adequate strength is provided for the conditions of service, and in addition the cutting edge may be coated, if necessary, with any desired material which gives adequate hardness and toughness in service.
Claims (36)
1. A tool holder, for use in an edge tool comprising an assembly of tool holder and replaceable tool bit having a body part and an operative working end, the tool holder having a body with a first passage extending inwardly from an end face of the body in which the tool bit is to be mounted so as to have said working end projecting from one end of said passage, a second passage extending transversely to said first passage, a locking member mounted in the second passage, means to engage said body part of the tool bit to apply thereto a locking force from the locking member, said locking member being movable be tween a free position, wherein the tool bit can be withdrawn from said first passage, and a locking position in which the tool bit is secured in the first passage by being forced against the wall of the first passage.
2. A tool holder according to claim 1 wherein the locking member may be in the form of a rotatable cam.
3. A tool holder according to claim 2 wherein the second passage is of circular cross-section and the locking member of generally cylindrical form with a part thereof constituting the cam being also cylindrical but being eccentric in relation to the remainder of the cylindrical form of the locking member.
4. A tool holder according to any one of the preceding claims which is elongate and said first passage extends generally parallel to the longitudinal axis of the tool holder.
5. A tool holder according to any one of the preceding claims wherein said means to engage said body part comprises a part of the locking member which directly engages the tool bit.
6. A tool holder according to claim 5 wherein said second passage intersects said first passage so that, in use, part of the surface of the tool bit within the first passage projects into the second passage, said locking member being mounted in the second passage so as to engage said part of the surface of the tool bit in the manner of a wedge.
7. A tool holder according to claim 5 or claim 6 which includes a third passage which intersects the first passage so that, in use, an end part of the tool bit opposite to said operative end projects into the third passage and engages an abutment provided therein so as to limit movement of the tool bit inwardly of the first passage.
8. A tool holder according to any one of claims 5 to 7 which is of generally rectangular right-parallelopiped shape.
9. A tool holder according to any one of claims 1 to 4 wherein said means to engage said body part comprises an intermediate member adapted to be engaged by the locking member and thereby to be urged into engagement with the tool bit.
10. A tool holder according to claim 9 wherein the intermediate member is provided in a recess in the tool holder which extends between, and is in communication with, said first and second passages.
11. A tool holder according to claim 10 wherein the recess comprises a groove extending inwardly from the end face of the tool.
12. A tool holder according to claim 10 or claim 11 wherein the intermediate member is provided with a recess in which the locking member is received and engages the wall of the recess to move the intermediate member into locking engagement with the tool bit.
13. A tool holder according to any one of claims 9 to 12 wherein the tool holder is generally cylindrical and preferably is of stepped cylindrical configuration.
14. An edge tool comprising an assembly of tool holder according to any one of the preceding claims and a replaceable tool bit having an operative working end, the tool bit being mounted in said first passage so as to have said working end projecting from one end of said passage, and said means engaging said body part of the tool bit to apply thereto a locking force from the locking member so that the tool bit is secured in the first passage by being forced against the wall of the first passage.
15. A tool according to claim 14 wherein the tool bit is made of steel and the operative working end is coated with titanium or other hard material.
16. A tool according to claim 14 or claim 15 wherein the working end comprises a cutting edge.
17. A tool according to any one of claims 14 to 16 wherein the tool bit has a working end at each of two opposite ends thereof.
18. A tool according to any one of claims 14 to 17 wherein said means engaging said body part comprises a part of the locking member in direct engagement with the tool bit.
19. A tool according to claim 18 wherein the first passage is of circular cross-section and the part of the surface of the tool bit which is engaged by said locking member is of part circular cross-section with a chordal planar surface which is in a plane parallel to the axis of the bit.
20. A tool according to claim 19 wherein the or each working end has a cutting edge parallel to said plane and transverse to the longitudinal axis of the tool holder.
21. A tool according to any one of claims 18 to 20 wherein the tool holder is provided with a support portion projecting from said end face to provide a backing support for the projecting part of the tool bit.
22. A tool according to any one of claims 14 to 17 wherein said means comprises an intermediate member engaged by the locking member and urged into engagement thereby with the tool bit.
23. A tool according to claim 22 wherein the tool bit has a surface adapted to engage with the intermediate member so as to prevent rotation of the tool bit relative to the intermediate member.
24. A tool according to claims 22 or 23 wherein the first passage is generally cylindrical and the tool bit has an external surface, part of which is of generally cylindrical configuration, and part of which is of generally Vsection channel configuration, the intermediate member having a projecting V-shaped portion adapted to engage within said Vsection channel thereby to prevent rotation of the tool bit in the first passage.
25. A tool according to claim 24 wherein the or each working end has a cutting edge extending generally parallel to said longitudinal axis.
26. A tool according to any one of claims 22 to 25 wherein the operative working end of the tool bit is mounted solely in cantilever in the tool holder without any backing support.
27. A tool bit, for use in an edge tool comprising an assembly of tool holder and replaceable tool bit having an operative working end, the tool bit comprising a body having a cross-section including a portion which is part-circular and a portion which is chordal so as to provide a planar surface, there being a working end at least at one end of the body.
28. A tool bit according to claim 27 which has a working end at each of two opposite ends of the body.
29. A tool bit according to claim 27 or claim 28 which has a cutting edge at the or each working end which lies in a plane parallel to that of said planar portion of the body and extending transverse to the longitudinal axis of the body.
30. A tool bit, for use in an edge tool comprising an assembly of tool holder and replaceable tool bit having an operative working end, the tool bit having a cross-section including a portion which is part-circular and a portion which is of generally V-section channel configuration, and there being a working end at least at one end of the body.
31. A tool bit according to claim 30 which has a working end at each of two opposite ends of the body.
32. A tool bit according to claim 30 or claim 31 which has a cutting edge at the or each working end which extends parallel to the longitudinal axis of the body.
33. A tool holder substantially as hereinbefore described with reference to the accompanying drawings.
34. A tool substantially as hereinbefore described with reference to the accompanying drawings.
35. A tool bit substantially as hereinbefore described with reference to the accompanying drawings.
36. Any novel feature or novel combination of features disclosed herein and/or shown in the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8120251A GB2083386B (en) | 1980-09-09 | 1981-07-01 | Tool holder and edge tool bit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8029124 | 1980-09-09 | ||
| GB8120251A GB2083386B (en) | 1980-09-09 | 1981-07-01 | Tool holder and edge tool bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2083386A true GB2083386A (en) | 1982-03-24 |
| GB2083386B GB2083386B (en) | 1984-09-19 |
Family
ID=26276837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8120251A Expired GB2083386B (en) | 1980-09-09 | 1981-07-01 | Tool holder and edge tool bit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2083386B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0264642A1 (en) * | 1986-09-22 | 1988-04-27 | Karl-Heinz Holler | Cutting tool for metal cutting in particular grooving tool |
| US7293942B2 (en) * | 2002-09-06 | 2007-11-13 | Prototype Productions, Inc. | Tool apparatus |
| WO2013018087A3 (en) * | 2011-08-02 | 2013-03-28 | Iscar Ltd. | Modular cutting tool holder and clamping mechanism therefor |
| CN103934483A (en) * | 2013-01-21 | 2014-07-23 | 上海船用曲轴有限公司 | Tool for machining crank throw inner deflection part |
-
1981
- 1981-07-01 GB GB8120251A patent/GB2083386B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0264642A1 (en) * | 1986-09-22 | 1988-04-27 | Karl-Heinz Holler | Cutting tool for metal cutting in particular grooving tool |
| US7293942B2 (en) * | 2002-09-06 | 2007-11-13 | Prototype Productions, Inc. | Tool apparatus |
| WO2013018087A3 (en) * | 2011-08-02 | 2013-03-28 | Iscar Ltd. | Modular cutting tool holder and clamping mechanism therefor |
| US8875606B2 (en) | 2011-08-02 | 2014-11-04 | Iscar, Ltd. | Modular cutting tool holder and clamping mechanism therefor |
| CN103934483A (en) * | 2013-01-21 | 2014-07-23 | 上海船用曲轴有限公司 | Tool for machining crank throw inner deflection part |
| CN103934483B (en) * | 2013-01-21 | 2016-07-06 | 上海船用曲轴有限公司 | A kind of cutter for processing crank throw internal arm |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2083386B (en) | 1984-09-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |