CA1046320A - Broaching tool for planar surfaces - Google Patents
Broaching tool for planar surfacesInfo
- Publication number
- CA1046320A CA1046320A CA268,590A CA268590A CA1046320A CA 1046320 A CA1046320 A CA 1046320A CA 268590 A CA268590 A CA 268590A CA 1046320 A CA1046320 A CA 1046320A
- Authority
- CA
- Canada
- Prior art keywords
- discs
- disc
- broaching
- rib
- face
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D43/00—Broaching tools
- B23D43/02—Broaching tools for cutting by rectilinear movement
- B23D43/04—Broaching tools for cutting by rectilinear movement having inserted cutting edges
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling, Broaching, Filing, Reaming, And Others (AREA)
- Milling Processes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A broaching tool is described for broaching planar surfaces. The tool includes an elongated flat tool body having a plurality of spaced ribs disposed generally transverse to the longitudinal body axis. A plurality of cylindrical cutter discs are mounted along each rib, with each disc being positioned with its flat face disposed 1-15° of coincidence with the longitudinal axis of the body. Each disc has a cylindrical end face providing a cutting edge disposed about the periphery of the end face. The discs along each rib are staggered laterally with respect to the discs of the next adjacent rib, with each disc projecting beyond the outer face of the rib and being rotatably indexable about its longitudinal axis to bring successive cutting portions into cutting position.
A broaching tool is described for broaching planar surfaces. The tool includes an elongated flat tool body having a plurality of spaced ribs disposed generally transverse to the longitudinal body axis. A plurality of cylindrical cutter discs are mounted along each rib, with each disc being positioned with its flat face disposed 1-15° of coincidence with the longitudinal axis of the body. Each disc has a cylindrical end face providing a cutting edge disposed about the periphery of the end face. The discs along each rib are staggered laterally with respect to the discs of the next adjacent rib, with each disc projecting beyond the outer face of the rib and being rotatably indexable about its longitudinal axis to bring successive cutting portions into cutting position.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates to the novel broaching tool of the type typically used to broach a flat surface or a portion of a surface,
1. Field of the Invention This invention relates to the novel broaching tool of the type typically used to broach a flat surface or a portion of a surface,
2. Description of the rrior Art Broaching is a machine process whereby one or more cutters with a series of teeth are pushed or drawn entirely across a workpiece and is analogous to single stroke filing.
Broaching is typically carried out on manual operated presses on pull screw machines or on hydraulically actuated broaching machines or presses. The broach has teeth which increase in height towards one end and is typically held in the screw socket of a broaching machine screw or ram by a cotter pin.
Usually the first few teeth on the broach are low to permit the small end of the tool to pass over the work piece, . while the intermediate teeth do most of the metal removal work, and the last few rows finish the surface to size.
The typical broaching tool presently in use is in the form of an elongated body having a plurality of spaced ribs generally transverse to the longitudinal body of the axis.
A series of titanium carbide teeth are brazed onto the longitudinal body axis. Each of these teeth has a cutting edge. Of course when these cutter teeth become worn it becomes a very expensive proposition to remove the worn teeth and then braze the new cutter teeth into position against the ribs.
Also, because each cutting edge engages the work piece at substantially 90, it will be appreciated that immense stresses are placed on the tool and the cutter teeth particularly when - 2 - ~
04~zo broaching me tal8 .
Recently, broaching tools have been developed wlth disposable and indexable cutting inserts, such as thct des-cribed in Price et al, U.S. Patent 3,707,748, issued January 2, 1973. However, it will be seen that a negative-rake angle of approximately 3 is used which means that the cutting edge still engages the workpiece at substantially 90.
Another recent design of broaching tool having in-dexable and reversable cutting inserts is described in Dupuis, 10 U.S. Patent RE28239 of November 12, 1974. Again, it will be seen that the cutting inserts engage th~ workpiece at sub-8 tantially 90.
Recently some rotary mllling cu~ters have utilized cutter teeth in the shape of buttons or discs which are in-dexably mountable on supporting ribs. One such device is des-cribet in Saari U.S. Patent 3,540,103 issued November 17, 1970.
It will, of course, be appreciated that broaching is a totally different kind of machine operation from rotary milling in that broaching involves no rotation and is strictly a pushing action slmilar to filing. Another milling cutter utilizing similar buttons or discs as cutter teeth is described in Coleshill et al U.S. Patent 3,371,397 issued March 5, 1968.
In applicant's U.S. Patent 3,946,472, issued March 30, 1976 there i9 described a broaching tool in which cutter teeth in the shape of buttons or discs have been successfully used for the broaching of concave surfaces. This had the unique feature of being able to make use of the angular posi-tloning of the discs 80 as to form a smoothly curving contoured surface.
It is the ob~ect of this invention to provide a still further improvement in broaehing tools for the broaching of planar or flat surfaces.
Broaching is typically carried out on manual operated presses on pull screw machines or on hydraulically actuated broaching machines or presses. The broach has teeth which increase in height towards one end and is typically held in the screw socket of a broaching machine screw or ram by a cotter pin.
Usually the first few teeth on the broach are low to permit the small end of the tool to pass over the work piece, . while the intermediate teeth do most of the metal removal work, and the last few rows finish the surface to size.
The typical broaching tool presently in use is in the form of an elongated body having a plurality of spaced ribs generally transverse to the longitudinal body of the axis.
A series of titanium carbide teeth are brazed onto the longitudinal body axis. Each of these teeth has a cutting edge. Of course when these cutter teeth become worn it becomes a very expensive proposition to remove the worn teeth and then braze the new cutter teeth into position against the ribs.
Also, because each cutting edge engages the work piece at substantially 90, it will be appreciated that immense stresses are placed on the tool and the cutter teeth particularly when - 2 - ~
04~zo broaching me tal8 .
Recently, broaching tools have been developed wlth disposable and indexable cutting inserts, such as thct des-cribed in Price et al, U.S. Patent 3,707,748, issued January 2, 1973. However, it will be seen that a negative-rake angle of approximately 3 is used which means that the cutting edge still engages the workpiece at substantially 90.
Another recent design of broaching tool having in-dexable and reversable cutting inserts is described in Dupuis, 10 U.S. Patent RE28239 of November 12, 1974. Again, it will be seen that the cutting inserts engage th~ workpiece at sub-8 tantially 90.
Recently some rotary mllling cu~ters have utilized cutter teeth in the shape of buttons or discs which are in-dexably mountable on supporting ribs. One such device is des-cribet in Saari U.S. Patent 3,540,103 issued November 17, 1970.
It will, of course, be appreciated that broaching is a totally different kind of machine operation from rotary milling in that broaching involves no rotation and is strictly a pushing action slmilar to filing. Another milling cutter utilizing similar buttons or discs as cutter teeth is described in Coleshill et al U.S. Patent 3,371,397 issued March 5, 1968.
In applicant's U.S. Patent 3,946,472, issued March 30, 1976 there i9 described a broaching tool in which cutter teeth in the shape of buttons or discs have been successfully used for the broaching of concave surfaces. This had the unique feature of being able to make use of the angular posi-tloning of the discs 80 as to form a smoothly curving contoured surface.
It is the ob~ect of this invention to provide a still further improvement in broaehing tools for the broaching of planar or flat surfaces.
- 3 -' - . -, , , ~0~63Z0 SUMMARY OF THE INVENTION
In accordance with the present invention a novel broaching tool for broaching planar surfaces comprises an elonKated flat tool body having a plurality of spaced ribs dlsposed generally transverse to the longitudinal body axis with a plurality of cylindrical cutter discs mounted along each rib. Each disc is positioned with its flat end face disposed within 1-15 of coincidence with the longitudinal axis of the body, with a cylindrical edge face providing a cutting edge disposed about the periphery of the end face.
The discs along each rib are staggered laterally with respect to the discs of the next ad;acent rib such that the paths of successive cutter discs overlap. Each disc projects beyond the outer face of the rib and is rotatably indexable about its axis to bring successive cutting portions into cutting position.
Although separate ribs for the support of the cutter discs are not essential, they are certainly preferably in any commercial installation since the lateral gaps between the ribs can form chip relief gaps.
The ribs have recessed into the upper face thereof cutter disc retaining sockets, each having a bottom face machined at a specific positive angle within the range of 1 to 15 of coincidence with the longitudinal axis of the tool body so as to result in a negative rake angle. ~ach socket has a rear abutment wall which engages the trailing side of the cutter and has an open front. The abutment wall is pre-ferably perpendicular to the socket bottom wall and is also curved to conform to the curvature of the cutter. For securing a cutter disc in a socket, a tapped hole is preferably provided in the bottom waIl of the socket for receiving a retaining --` 3ZO
screw extending through the cutter disc. The tapped hole is preferably positioned so as to firmly wedge the cutter disc against the abutment wall. Because of the lateral support given the cutter by the sides of the socket, the screw is not sub~ected to shearing stresses but merely serves to hold the cutter firmly against the seat of the socket.
Preferably each succeeding rib is slightly larger than the preceeding rib so as to produce a progressively larger cutter as the broach is moved across the workpiece or the work-piece over the broach. Alternatively, a portion of the broachcan have a series of ribs machined to similar dimensions from the base of the tool body to the cutting disc sockets so as not to generate an increase in size but to afford a final finlshed surface of a specific size.
It is also possible for all of the ribs to be machined to the same height throughout the entire length of the broach so as not to generate any increase in size of the tool. With this arrangement the broach can be mounted on a subholder havlng an incline, thereby generating a larger cut on the workpiece as the broach passes over the workpiece or the workpiece over the broach.
The angle of the cutter discs with respect to the longitudinal axis of the body can be varied within the range of 1 to 15. Generally they will be set at an angle of about 3 to 12. This very shallow angle combined with the over- ~ -lapping in the paths of successive cutters due to the staggered srrangement of cutters in successive rows, results in very ~hallow grooves being formed on the finished surface. This shallow grooving i8 generally comparable to grooving that is inherent in any broaching of planar surfaces using traditional cutters which engage the workpiece at ~ubstantially 90. It ~O~G~ZO
has been found that these grooves can easily be removed using a commercial shave broach.
The greatest advantage in the use of the cylindrical cutters for the broaching of planar surfaces has been in the remarkable decrease in the load on the tool during broaching.
It has been found that this load is decreased by as much as 65%. This has the effect of greatly decreasing the incidence of broken cutters as well as other portions of the broaching tool assembly. It may even permit a lighter construction of the tool assembly.
Certain preferred embodiments of this invention will now be illustrated by the attached drawings in which:
Figure 1 is a perspective view of one embodiment of the novel broaching tool;
Figure 2 is a cross-sectional view along the length of the tool;
Figure 3 is an end elevation of the tool; and Figure 4 is an exploded detail view of a cutting disc snd socket.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings and Figure 1 in par- -tlcular, reference numeral 10 indicates generally a broaching assembly according to this invention for broaching planar surfaces. The reference numeral 11 indicates generally a broaching assembly for broaching contoured surfaces as described in U.S. Patent 3,946,472. The use of pair of broaching as8emblies 10 according to the invention and the curved assembly 11 make it possible to broach in a single operation the planar and contoured surfaces of the workpiece W.
The broaching assemblies 10, 11 are adapted to be mounted on a broaching machine (not shown) by means well known.
~0~320 The portion of the machine to which the broaching assemblies are connected may be either the stationary portion, or the movable portion, such as the ram of a broaching machine. The workpiece W is connected to the alternate member of the broaching machine such that a cutting stroke may be established between the broaching assemblies and the workpiece.
Looking now more particularly at Figures 2, 3 and 4, it will be seen that the broaching assembly of this invention has an elongated tool holder body portion 12 having a series of transverse, longitudinally spaced pro~ecting ribs 13.
Between these ribs 13 are chip gulleys 14 and at the leading face of each rib are machined a series of sockets lS for receiving cutter discs 19. Each of these sockets 15 has a flat bottom face 16 which is inclined at a small angle (usually about 3 to 12) to the longitudinal axis of the tool holder and the socket also has a semicircular abutment wall 17 which is perpendicular to the bottom face 16. Extending into the tool holder through face 16 is a tapped hole 18.
Mounted in each socket i8 a cylindrical cutting disc 19. Each of these cutting discs has a cylindrical side or edge wall 20 and flat end faces 21. A hole 23 is formed axially through the insert with a conical counter sink 22.
The cutting discs are typically made from tungsten carbide.
The cutting disc 19 is held in position by means of a threaded screw 25 with a socket 24 for receiving a wrench.
When the cutting disc has been placed in position in the sockee and the screw tightened, the disc 19 is pressed firmly against the semicircular wall 17. Thus, when the broach is in operation the forces on the cutting discs 19 are fully carried by the abutment walls rather than by the screws themselves.
~046;~20 With this arrangement, it will be seen that only about one-quarter of the cutting edge of the cutter discs is used at one time. This means that as the portion in use becomes dulled, the screws can be loosened and the cutter dlscs can then be rotated sufficiently to present fresh cutting edge portions, after which the screws ar~ once again tightened.
The result is that as many as four cutting edge portions may be available on one face of a cutting disc. Furthermore, it is possible to make the discs reversable so that another four cutting edge portions may be available on the reverse face.
In this way as many as eight fresh cutting edge portions may be obtainable from a single cutting disc. The cutter discs have diameters generally ranging from about 3/8 inch to about 1 inch.
As can be seen from Figure 1, the various rows of cutting inserts are positioned in a staggered manner. Thus, the axes of the second row of cutter discs 19a are positioned midway between the axes of the first row of cutter discs 19 while the third row of cutter discs l9b are in longitudinal allgnment with the first row.
As will be seen from Figure 3, the broach is tapered wlth each row of cutter di6cs being positioned slightly higher than the previous row, to accomplish additional cutting of the workpiece W by each row of cutter discs.
While the above preferred embodiment illustrates a screw connection for mounting the cutter discs in the sockets, it will be readily apparent to those skilled in the art that many other kinds of mounting means are possible. Thus, wedge pins, etc. can be used. It would also be understood by those skllled in the art that various other modifications and adaptations of the invention herein disclosed may be made without materially departing from the scope of the appended claims.
In accordance with the present invention a novel broaching tool for broaching planar surfaces comprises an elonKated flat tool body having a plurality of spaced ribs dlsposed generally transverse to the longitudinal body axis with a plurality of cylindrical cutter discs mounted along each rib. Each disc is positioned with its flat end face disposed within 1-15 of coincidence with the longitudinal axis of the body, with a cylindrical edge face providing a cutting edge disposed about the periphery of the end face.
The discs along each rib are staggered laterally with respect to the discs of the next ad;acent rib such that the paths of successive cutter discs overlap. Each disc projects beyond the outer face of the rib and is rotatably indexable about its axis to bring successive cutting portions into cutting position.
Although separate ribs for the support of the cutter discs are not essential, they are certainly preferably in any commercial installation since the lateral gaps between the ribs can form chip relief gaps.
The ribs have recessed into the upper face thereof cutter disc retaining sockets, each having a bottom face machined at a specific positive angle within the range of 1 to 15 of coincidence with the longitudinal axis of the tool body so as to result in a negative rake angle. ~ach socket has a rear abutment wall which engages the trailing side of the cutter and has an open front. The abutment wall is pre-ferably perpendicular to the socket bottom wall and is also curved to conform to the curvature of the cutter. For securing a cutter disc in a socket, a tapped hole is preferably provided in the bottom waIl of the socket for receiving a retaining --` 3ZO
screw extending through the cutter disc. The tapped hole is preferably positioned so as to firmly wedge the cutter disc against the abutment wall. Because of the lateral support given the cutter by the sides of the socket, the screw is not sub~ected to shearing stresses but merely serves to hold the cutter firmly against the seat of the socket.
Preferably each succeeding rib is slightly larger than the preceeding rib so as to produce a progressively larger cutter as the broach is moved across the workpiece or the work-piece over the broach. Alternatively, a portion of the broachcan have a series of ribs machined to similar dimensions from the base of the tool body to the cutting disc sockets so as not to generate an increase in size but to afford a final finlshed surface of a specific size.
It is also possible for all of the ribs to be machined to the same height throughout the entire length of the broach so as not to generate any increase in size of the tool. With this arrangement the broach can be mounted on a subholder havlng an incline, thereby generating a larger cut on the workpiece as the broach passes over the workpiece or the workpiece over the broach.
The angle of the cutter discs with respect to the longitudinal axis of the body can be varied within the range of 1 to 15. Generally they will be set at an angle of about 3 to 12. This very shallow angle combined with the over- ~ -lapping in the paths of successive cutters due to the staggered srrangement of cutters in successive rows, results in very ~hallow grooves being formed on the finished surface. This shallow grooving i8 generally comparable to grooving that is inherent in any broaching of planar surfaces using traditional cutters which engage the workpiece at ~ubstantially 90. It ~O~G~ZO
has been found that these grooves can easily be removed using a commercial shave broach.
The greatest advantage in the use of the cylindrical cutters for the broaching of planar surfaces has been in the remarkable decrease in the load on the tool during broaching.
It has been found that this load is decreased by as much as 65%. This has the effect of greatly decreasing the incidence of broken cutters as well as other portions of the broaching tool assembly. It may even permit a lighter construction of the tool assembly.
Certain preferred embodiments of this invention will now be illustrated by the attached drawings in which:
Figure 1 is a perspective view of one embodiment of the novel broaching tool;
Figure 2 is a cross-sectional view along the length of the tool;
Figure 3 is an end elevation of the tool; and Figure 4 is an exploded detail view of a cutting disc snd socket.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings and Figure 1 in par- -tlcular, reference numeral 10 indicates generally a broaching assembly according to this invention for broaching planar surfaces. The reference numeral 11 indicates generally a broaching assembly for broaching contoured surfaces as described in U.S. Patent 3,946,472. The use of pair of broaching as8emblies 10 according to the invention and the curved assembly 11 make it possible to broach in a single operation the planar and contoured surfaces of the workpiece W.
The broaching assemblies 10, 11 are adapted to be mounted on a broaching machine (not shown) by means well known.
~0~320 The portion of the machine to which the broaching assemblies are connected may be either the stationary portion, or the movable portion, such as the ram of a broaching machine. The workpiece W is connected to the alternate member of the broaching machine such that a cutting stroke may be established between the broaching assemblies and the workpiece.
Looking now more particularly at Figures 2, 3 and 4, it will be seen that the broaching assembly of this invention has an elongated tool holder body portion 12 having a series of transverse, longitudinally spaced pro~ecting ribs 13.
Between these ribs 13 are chip gulleys 14 and at the leading face of each rib are machined a series of sockets lS for receiving cutter discs 19. Each of these sockets 15 has a flat bottom face 16 which is inclined at a small angle (usually about 3 to 12) to the longitudinal axis of the tool holder and the socket also has a semicircular abutment wall 17 which is perpendicular to the bottom face 16. Extending into the tool holder through face 16 is a tapped hole 18.
Mounted in each socket i8 a cylindrical cutting disc 19. Each of these cutting discs has a cylindrical side or edge wall 20 and flat end faces 21. A hole 23 is formed axially through the insert with a conical counter sink 22.
The cutting discs are typically made from tungsten carbide.
The cutting disc 19 is held in position by means of a threaded screw 25 with a socket 24 for receiving a wrench.
When the cutting disc has been placed in position in the sockee and the screw tightened, the disc 19 is pressed firmly against the semicircular wall 17. Thus, when the broach is in operation the forces on the cutting discs 19 are fully carried by the abutment walls rather than by the screws themselves.
~046;~20 With this arrangement, it will be seen that only about one-quarter of the cutting edge of the cutter discs is used at one time. This means that as the portion in use becomes dulled, the screws can be loosened and the cutter dlscs can then be rotated sufficiently to present fresh cutting edge portions, after which the screws ar~ once again tightened.
The result is that as many as four cutting edge portions may be available on one face of a cutting disc. Furthermore, it is possible to make the discs reversable so that another four cutting edge portions may be available on the reverse face.
In this way as many as eight fresh cutting edge portions may be obtainable from a single cutting disc. The cutter discs have diameters generally ranging from about 3/8 inch to about 1 inch.
As can be seen from Figure 1, the various rows of cutting inserts are positioned in a staggered manner. Thus, the axes of the second row of cutter discs 19a are positioned midway between the axes of the first row of cutter discs 19 while the third row of cutter discs l9b are in longitudinal allgnment with the first row.
As will be seen from Figure 3, the broach is tapered wlth each row of cutter di6cs being positioned slightly higher than the previous row, to accomplish additional cutting of the workpiece W by each row of cutter discs.
While the above preferred embodiment illustrates a screw connection for mounting the cutter discs in the sockets, it will be readily apparent to those skilled in the art that many other kinds of mounting means are possible. Thus, wedge pins, etc. can be used. It would also be understood by those skllled in the art that various other modifications and adaptations of the invention herein disclosed may be made without materially departing from the scope of the appended claims.
Claims (6)
1. A broaching tool for broaching planar surfaces comprising an elongated flat tool body having a plurality of spaced ribs disposed generally transverse to the longitudinal body axis, a plurality of cylindrical cutter discs mounted along each rib, each disc being positioned with its flat face disposed within 1-15° of coincidence with the longitudinal axis of said body, each disc having an edge face providing a cutting edge disposed about the periphery of the edge face, the discs along each rib being staggered axially with respect to the discs of the next adjacent rib, each disc projecting beyond the outer face of the rib and being rotatably indexable about its longitudinal axis to bring successive cutting portions into cutting position.
2. A broaching tool according to claim 1 wherein said cutter discs are recessed in retaining sockets in said ribs.
3. A broaching tool according to claim 2 wherein each said socket has a flat bottom face disposed within 1-15° of coincidence with the longitudinal axis of the tool body and an arcuate rear abutment wall perpendicular to said bottom face.
4. A broaching tool according to claim 2 wherein the cutter disc is retained in said socket by means of a screw turned into a tapped hole in said socket bottom face.
5. A broaching tool according to claim l wherein each succeeding rib has a higher surface than the preceeding rib.
6. A broaching tool for broaching planar surfaces comprising an elongated flat tool body having a plurality of cylindrical cutter discs mounted thereon, each disc being positioned with its flat face disposed within 1-15° of coin-cidence with the longitudinal axis of said body, each disc having a cylindrical edge face providing a cutting edge disposed about the periphery of the edge face, said discs being arranged in lateral rows with the discs in each row being staggered laterally with respect to the discs of the next following row and each disc being rotatably indexable about its axis to bring successive cutting portions into cutting position.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US74591176A | 1976-11-29 | 1976-11-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1046320A true CA1046320A (en) | 1979-01-16 |
Family
ID=24998755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA268,590A Expired CA1046320A (en) | 1976-11-29 | 1976-12-22 | Broaching tool for planar surfaces |
Country Status (7)
| Country | Link |
|---|---|
| AU (1) | AU3095277A (en) |
| CA (1) | CA1046320A (en) |
| DE (1) | DE2752826A1 (en) |
| FR (1) | FR2371994A1 (en) |
| GB (1) | GB1538835A (en) |
| IT (1) | IT1088316B (en) |
| SE (1) | SE7713462L (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3936784A1 (en) * | 1989-11-04 | 1991-09-19 | Glyco Metall Werke | Jig for preparation of bearing shells - has magnetic grip for shells with magnetic pick=up |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US28239A (en) * | 1860-05-08 | mcclelland | ||
| US2730793A (en) * | 1953-10-21 | 1956-01-17 | Nat Broach & Mach | Broaching tool |
| US2770028A (en) * | 1955-01-31 | 1956-11-13 | Lapointe Machine Tool Co | Broach with multiple small cutting units |
| USRE28239E (en) * | 1970-01-02 | 1974-11-12 | Dupuis indexable broach | |
| US3946472A (en) * | 1975-01-22 | 1976-03-30 | J. P. Tool Limited | Broaching tool |
| FR2318700A1 (en) * | 1975-07-22 | 1977-02-18 | Hoffmann Raeumwerkzeug | External broaching tool for plane surfaces - uses round broaches inclined to stroke advance, turned at intervals to distribute wear |
-
1976
- 1976-12-22 CA CA268,590A patent/CA1046320A/en not_active Expired
-
1977
- 1977-11-24 AU AU30952/77A patent/AU3095277A/en active Pending
- 1977-11-26 DE DE19772752826 patent/DE2752826A1/en not_active Ceased
- 1977-11-28 GB GB4946377A patent/GB1538835A/en not_active Expired
- 1977-11-28 SE SE7713462A patent/SE7713462L/en not_active Application Discontinuation
- 1977-11-29 IT IT3010277A patent/IT1088316B/en active
- 1977-11-29 FR FR7735852A patent/FR2371994A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| SE7713462L (en) | 1978-05-30 |
| GB1538835A (en) | 1979-01-24 |
| AU3095277A (en) | 1979-05-31 |
| FR2371994B1 (en) | 1983-08-19 |
| DE2752826A1 (en) | 1978-06-01 |
| FR2371994A1 (en) | 1978-06-23 |
| IT1088316B (en) | 1985-06-10 |
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