WO2011065901A1 - Device for connecting a replaceable cutting top part to a tool body - Google Patents

Device for connecting a replaceable cutting top part to a tool body Download PDF

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Publication number
WO2011065901A1
WO2011065901A1 PCT/SE2010/051287 SE2010051287W WO2011065901A1 WO 2011065901 A1 WO2011065901 A1 WO 2011065901A1 SE 2010051287 W SE2010051287 W SE 2010051287W WO 2011065901 A1 WO2011065901 A1 WO 2011065901A1
Authority
WO
WIPO (PCT)
Prior art keywords
top part
tool body
ridges
connection
grooves
Prior art date
Application number
PCT/SE2010/051287
Other languages
French (fr)
Inventor
Mattias Svensson
Original Assignee
Dof Tools Ab
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 Dof Tools Ab filed Critical Dof Tools Ab
Priority to EP10833666A priority Critical patent/EP2504119A1/en
Publication of WO2011065901A1 publication Critical patent/WO2011065901A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B23C5/22—Securing arrangements for bits or teeth or cutting inserts
    • 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
    • B23D77/00—Reaming tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/02—Connections between shanks and removable cutting heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/02—Connections between the shanks and detachable cutting heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/03—Cutting heads comprised of different material than the shank irrespective of whether the head is detachable from the shank
    • 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
    • B23D2277/00—Reaming tools
    • B23D2277/02—Cutting head and shank made from two different components which are releasably or non-releasably attached to each other

Definitions

  • the present invention relates to a device in connection with rotary tools for cutting machining and having a replaceable cutting top part and a clamping tool body that has a cylindrical reception part provided with a number of
  • the invention is intended to be applied in connection with rotary tools intended for cutting machining and having a replaceable tip and having a coupling for high loads.
  • Said known products have a common disadvantage, namely that when great forces arise, these known tool bodies cannot manage to hold the top parts in place, which leads to breakdown, which in turn leads to lower productivity parameters being used than what otherwise would be the case.
  • US 756,339 Al discloses a tool in the form of a dismountable drill wherein the drill tip (B) , via threads, is attachable by screwing to a rear mating drill body (A) .
  • internal threads (4) are arranged in the proper drill tip (B) , which makes it cumbersome to produce using the cemented carbide tools utilized today.
  • US 6,582,164 Bl discloses a drill having a drill tip (10) attachable by screwing and that is, with a radial thread (52), attachable by screwing in a drill holder (14) and the interior mating radial thread thereof. This clamping is provided by a single thread turn, which seems to be very weak.
  • US 2008/0193237 Al discloses clamping according to the above-mentioned kind from Iscar, and US 2001/0041089 Al and WO 03/068436 Al, respectively, disclose tool attachment by means of threaded joints.
  • US 2001/0041089 Al concerns a
  • a thread extends hardly slightly helically and similar to teeth or ridges and valleys of splines, but runs the entire turn around with a fine or coarse pitch.
  • the ridges and the grooves are slightly helical, that the top part has a plug-shaped connection part having mating congruent grooves and ridges, similar to teeth or ridges and valleys of splines, whereby said connection between the grooves and the ridges of the top part and tool body interlocked in the engagement position is self-locking.
  • Fig. 1 shows an exploded view of a rotary tool with the cutting top part thereof and the rotary tool body thereof separated from each other in perspective
  • Fig. 2 shows the top part in perspective obliquely from behind
  • Fig. 3 shows a side view of a tool body
  • Fig. 4 shows an end view of the tool body
  • Fig. 5 shows a section view of a tool body
  • Figs. 6 and 7 show examples of clamping elements at the coupling end for a top part
  • Figs. 8-9 show a side view and an end view, respectively, of a top part
  • Fig. 10 shows side view of top part
  • Fig. 11 shows a section view along the line XI-XI in Fig. 10.
  • a rotary tool 1 normally consists of two main parts 2, 3, namely a tool body 2, which preferably is manufactured from metal or from another material that has good strength, and a cutting replaceable top part 3, which also preferably is manufactured from metal or from another material having good wear
  • the tool body is, via its shaft part, connected to a holding tool, which is found in various designs, among which a cylindrical shaft is commonly occurring.
  • the part of the tool body closest to the shaft part, the chip transportation part, is formed to give support to the top part, without being an obstacle to chips that are created at the cutting edges, as well as to provide a desired distance between the workpiece being machined and the holding tool, e.g., a drill chuck, a milling cutter, a turret, etc.
  • connection part of the tool body is formed as a cylindrical recess, having helical ridges that have been formed to give the connection self-locking properties, which arises when the tool is in friction, when the cutting edges are loaded, which prevents the top part from coming loose from its attachment.
  • the tool body 2 has a cylindrical reception part having mating radial grooves and the top part 3, i.e., the tool, has a plug-shaped
  • connection part having mating radial grooves, similar to teeth or ridges and valleys of splines.
  • the invention relates to a device 4 in connection with a rotary tool 1 that is intended to provide cutting machining, such as drilling, milling, etc., and that comprises a replaceable top part 3 provided with cutting inserts and a tool body 2 clamping said top part 3.
  • said tool body 2 has a cylindrical reception part 5 provided with a number of essentially radial ridges 6 and grooves 7.
  • the top part 3 has a plug-shaped connection part 8 provided with a number of mating congruent grooves 9 and ridges 10, similar to teeth or ridges and valleys of splines.
  • Said ridges 6; 10 and grooves 7; 9 are slightly helical and the connection between the grooves and the ridges of the top part 3 and tool body 2 interlocked in the engagement position is self-locking.
  • the helix of said ridges is twisted in the clockwise direction 13, whereby an increased friction arises when the cutting edges 12 of the top part 3 are loaded in machining by the tool 1 in said direction 13. Furthermore, as seen in the direction of rotation 13 in machining, the front side of the ridges is positioned at an angle, in relation to a tangent plane of the cylindrical segment of the connection, that is less than 90°, whereby a locking effect arises in the radial direction between the tool body 2 and the top part 3, while the back side of said ridges, as seen in the direction of rotation 13 in machining, slopes at an obtuse angle, preferably approx . 135 ° .
  • top part 3 as well as the tool body 2 are provided with helical chip channel parts 14, 15 that allow efficient removal of machined material from the present working spot of the tool in question, e.g., at a drill hole or at a milling working spot.
  • the top part 3 as well as the tool body 2 are provided with cooling ducts 16, 17 to allow efficient machining of the material without damaging the same and the tool 1 by continuous supply of a suitable cooling liquid, e.g., of a known type, from a pumping station (not shown) .
  • a suitable cooling liquid e.g., of a known type
  • a clamping element 18, 19 between the top part 3 and the receiving connection part 5 of the tool body 2 is arranged to detachably hold the top part in place in the tool body in the axial direction 20.
  • a clamping element 18, 19 is formed of, e.g., a number of hooks 19 and recesses
  • hook 19 is resilient so as to be brought between a position spaced apart from the recess 18 and a received position in the recess 18, respectively.
  • connection part in the tool body is pulled apart
  • the top part 3 which in examples shown is formed of a drill bit of cemented carbide material, is locked axially by means of the hooks 19 that are received in a mating recess 18 in the top part's 3 inner portion 8A of its cylindrical plug- shaped connection part 8, so that the parts 2, 3 hook on each other and are clamped efficiently to each other in the axial direction 20. Disconnection is carried out in the opposite order of the described procedure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

The invention relates to a device (4) in connection with rotary tools (1) for cutting machining and having a replaceable cutting top part (3) and a clamping tool body (2). The tool body (2) has a cylindrical reception part (5) provided with a number of essentially radial ridges (6) and grooves (7) and the top part (3) has a plug-shaped connection part (8) having mating congruent grooves (9) and ridges (10), similar to teeth or ridges and valleys of splines

Description

Device for connecting a replaceable cutting top part to a tool body
Device in connection with tools The present invention relates to a device in connection with rotary tools for cutting machining and having a replaceable cutting top part and a clamping tool body that has a cylindrical reception part provided with a number of
essentially radial ridges and grooves.
The invention is intended to be applied in connection with rotary tools intended for cutting machining and having a replaceable tip and having a coupling for high loads.
Such similar known products are utilized, among others, by:
- Iscar that has a product called CHAMDRILL, from about 1998. - Seco Tools AB that has a product denominated Crownloc, also from about 1998.
Said known products have a common disadvantage, namely that when great forces arise, these known tool bodies cannot manage to hold the top parts in place, which leads to breakdown, which in turn leads to lower productivity parameters being used than what otherwise would be the case.
As examples of other known solutions,
US 756,339 Al discloses a tool in the form of a dismountable drill wherein the drill tip (B) , via threads, is attachable by screwing to a rear mating drill body (A) . In that connection, internal threads (4) are arranged in the proper drill tip (B) , which makes it cumbersome to produce using the cemented carbide tools utilized today.
US 6,582,164 Bl discloses a drill having a drill tip (10) attachable by screwing and that is, with a radial thread (52), attachable by screwing in a drill holder (14) and the interior mating radial thread thereof. This clamping is provided by a single thread turn, which seems to be very weak.
US 2008/0193237 Al discloses clamping according to the above-mentioned kind from Iscar, and US 2001/0041089 Al and WO 03/068436 Al, respectively, disclose tool attachment by means of threaded joints. US 2001/0041089 Al concerns a
clamping device for a rotatable cutting tool and in the form of a threaded male member (22) and a threaded female member (24). A thread extends hardly slightly helically and similar to teeth or ridges and valleys of splines, but runs the entire turn around with a fine or coarse pitch.
The same disadvantages that have been said apply also to these.
The main object of the present patent
application is accordingly to provide a device that solves, among others, the problems mentioned above, and that by its unigue connection resists the greater cutting forces, foremost in the form of torque, that arise in cutting machining, when the highest possible productivity is to be attained, in the form of a high rate of cutting.
Said object is achieved by means of a device according to the present invention that essentially is
characterized in that the ridges and the grooves are slightly helical, that the top part has a plug-shaped connection part having mating congruent grooves and ridges, similar to teeth or ridges and valleys of splines, whereby said connection between the grooves and the ridges of the top part and tool body interlocked in the engagement position is self-locking.
The invention is described in the following, reference being made to the appended drawings in the form of a preferred embodiment example, in which
Fig. 1 shows an exploded view of a rotary tool with the cutting top part thereof and the rotary tool body thereof separated from each other in perspective, Fig. 2 shows the top part in perspective obliquely from behind,
Fig. 3 shows a side view of a tool body,
Fig. 4 shows an end view of the tool body, Fig. 5 shows a section view of a tool body,
Figs. 6 and 7 show examples of clamping elements at the coupling end for a top part,
Figs. 8-9 show a side view and an end view, respectively, of a top part,
Fig. 10 shows side view of top part, and
Fig. 11 shows a section view along the line XI-XI in Fig. 10.
A rotary tool 1 according to the present invention normally consists of two main parts 2, 3, namely a tool body 2, which preferably is manufactured from metal or from another material that has good strength, and a cutting replaceable top part 3, which also preferably is manufactured from metal or from another material having good wear
resistance, for instance cemented carbide.
The tool body is, via its shaft part, connected to a holding tool, which is found in various designs, among which a cylindrical shaft is commonly occurring.
The part of the tool body closest to the shaft part, the chip transportation part, is formed to give support to the top part, without being an obstacle to chips that are created at the cutting edges, as well as to provide a desired distance between the workpiece being machined and the holding tool, e.g., a drill chuck, a milling cutter, a turret, etc.
The connection part of the tool body is formed as a cylindrical recess, having helical ridges that have been formed to give the connection self-locking properties, which arises when the tool is in friction, when the cutting edges are loaded, which prevents the top part from coming loose from its attachment. By the front side of the ridges being positioned at an angle, in relation to a tangent plane of the cylindrical segment of the connection, that is smaller than 90°, a locking effect in the radial direction between tool body and top part arises.
Briefly, it could be said that the tool body 2 has a cylindrical reception part having mating radial grooves and the top part 3, i.e., the tool, has a plug-shaped
connection part having mating radial grooves, similar to teeth or ridges and valleys of splines.
More precisely, the invention relates to a device 4 in connection with a rotary tool 1 that is intended to provide cutting machining, such as drilling, milling, etc., and that comprises a replaceable top part 3 provided with cutting inserts and a tool body 2 clamping said top part 3.
According to the invention, said tool body 2 has a cylindrical reception part 5 provided with a number of essentially radial ridges 6 and grooves 7. The top part 3 has a plug-shaped connection part 8 provided with a number of mating congruent grooves 9 and ridges 10, similar to teeth or ridges and valleys of splines.
Said ridges 6; 10 and grooves 7; 9 are slightly helical and the connection between the grooves and the ridges of the top part 3 and tool body 2 interlocked in the engagement position is self-locking.
The helix of said ridges, as seen in the direction from the end face 11 of the tool body 2, is twisted in the clockwise direction 13, whereby an increased friction arises when the cutting edges 12 of the top part 3 are loaded in machining by the tool 1 in said direction 13. Furthermore, as seen in the direction of rotation 13 in machining, the front side of the ridges is positioned at an angle, in relation to a tangent plane of the cylindrical segment of the connection, that is less than 90°, whereby a locking effect arises in the radial direction between the tool body 2 and the top part 3, while the back side of said ridges, as seen in the direction of rotation 13 in machining, slopes at an obtuse angle, preferably approx . 135 ° .
Furthermore, the top part 3 as well as the tool body 2 are provided with helical chip channel parts 14, 15 that allow efficient removal of machined material from the present working spot of the tool in question, e.g., at a drill hole or at a milling working spot.
The top part 3 as well as the tool body 2 are provided with cooling ducts 16, 17 to allow efficient machining of the material without damaging the same and the tool 1 by continuous supply of a suitable cooling liquid, e.g., of a known type, from a pumping station (not shown) .
Finally, a clamping element 18, 19 between the top part 3 and the receiving connection part 5 of the tool body 2 is arranged to detachably hold the top part in place in the tool body in the axial direction 20. Such a clamping element 18, 19 is formed of, e.g., a number of hooks 19 and recesses
18, and which hook 19 is resilient so as to be brought between a position spaced apart from the recess 18 and a received position in the recess 18, respectively.
Upon mounting and interlocking of the tool 1, the connection part in the tool body is pulled apart,
preferably by means of a special tool that prises apart the resilient jaws 21 of the tool body 2. When they are released again, the top part 3, which in examples shown is formed of a drill bit of cemented carbide material, is locked axially by means of the hooks 19 that are received in a mating recess 18 in the top part's 3 inner portion 8A of its cylindrical plug- shaped connection part 8, so that the parts 2, 3 hook on each other and are clamped efficiently to each other in the axial direction 20. Disconnection is carried out in the opposite order of the described procedure.
The function and nature of the invention should have been understood from what has been described above and shown in the drawings .
Naturally, the invention is not limited to the embodiments described above and shown in the accompanying drawings. Modifications are feasible, particularly as for the nature of the different parts, or by using an equivalent technique, without departing from the protection area of the invention, such as it is defined in the claims.

Claims

CLAIMS 1. Device (4) in connection with rotary tools (1) for cutting machining and having a replaceable cutting top part (3) and a clamping tool body (2) that has a cylindrical reception part (5) provided with a number of essentially radial ridges (6) and grooves (7), characterized in that the ridges (6, 10) and the grooves (7, 9) are slightly helical, that the top part (3) has a plug-shaped connection part (8) having mating congruent grooves (9) and ridges (10), similar to teeth or ridges and valleys of splines, whereby said connection between the grooves (7, 9) and the ridges (6, 10) of the top part (3) and tool body (2) interlocked in the engagement position is self-locking .
2. Device according to claim 1, characterized in that the helix of the ridges, as seen from the end face (11) of the tool body (2), is twisted in the clockwise direction (13), whereby an increased friction arises when the cutting edges (12) of the top part (3) are loaded.
3. Device according to claim 2, characterized in that the front side of the ridges, as seen in the direction of rotation (13) in machining, is positioned at an angle, in relation to a tangent plane of the cylindrical segment of the connection, that is less than 90°, whereby a locking effect arises in the radial direction between the tool body (2) and the top part (3) .
4. Device according to claim 3, characterized in that the back side of said ridges, as seen in the direction of rotation (13) in machining, slopes at an obtuse angle,
preferably approx. 135°.
5. Device according to any one of the preceding claims, characterized in that the top part (3) as well as the tool body (2) are provided with helical chip channel parts (14, 15) .
6. Device according to claim 5, characterized in that the top part (3) as well as the tool body (2) are provided with cooling ducts (16, 17) .
7. Device according to any one of the preceding claims, characterized in that a clamping element (18, 19), situated between the top part (3) and the connection part (5) of the tool body (2) that is formed of a number of hooks (19) and recesses (18), and which hook (19) is resilient so as to be brought between a position spaced apart from the recess (18) and a received position in the recess (18), respectively, is arranged to detachably hold the top part (3) in place in the tool body (2) .
PCT/SE2010/051287 2009-11-24 2010-11-23 Device for connecting a replaceable cutting top part to a tool body WO2011065901A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10833666A EP2504119A1 (en) 2009-11-24 2010-11-23 Device for connecting a replaceable cutting top part to a tool body

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0950891A SE535180C2 (en) 2009-11-24 2009-11-24 Rotary tool coupling
SE0950891-2 2009-11-24

Publications (1)

Publication Number Publication Date
WO2011065901A1 true WO2011065901A1 (en) 2011-06-03

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PCT/SE2010/051287 WO2011065901A1 (en) 2009-11-24 2010-11-23 Device for connecting a replaceable cutting top part to a tool body

Country Status (3)

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EP (1) EP2504119A1 (en)
SE (1) SE535180C2 (en)
WO (1) WO2011065901A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2361708A1 (en) * 2009-12-08 2011-08-31 OSG Corporation Throw-away rotary tool
CN102380651A (en) * 2011-10-13 2012-03-21 东阳市速博数控刀具有限公司 Milling cutter for cutting carbide alloy with high speed
US20130004253A1 (en) * 2011-07-02 2013-01-03 Kennametal, Inc. Drilling/reaming tool
US20140017022A1 (en) * 2012-07-11 2014-01-16 Kennametal, Inc. Coupling point for a modular rotary tool and tool head carrier for a modular rotary tool
US9358626B2 (en) 2011-11-15 2016-06-07 Kennametal Inc. Manufacturing of holemaking tools

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3427876B1 (en) * 2017-07-10 2022-06-22 Sandvik Intellectual Property AB Rotary cutting insert and tool having axial locking member

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010041089A1 (en) * 2000-05-09 2001-11-15 Gil Hecht Tool Joint
US6582164B1 (en) * 2002-02-25 2003-06-24 Kennametal Inc. Roller twist drill
WO2003068436A1 (en) * 2002-02-12 2003-08-21 Stephan Schymonski Tool connection
US20080193237A1 (en) * 2007-02-12 2008-08-14 Iscar, Ltd. Rotary Cutting Tool Having Releasably Mounted Self-Clamping Cutting Head With Locking Member

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010041089A1 (en) * 2000-05-09 2001-11-15 Gil Hecht Tool Joint
WO2003068436A1 (en) * 2002-02-12 2003-08-21 Stephan Schymonski Tool connection
US6582164B1 (en) * 2002-02-25 2003-06-24 Kennametal Inc. Roller twist drill
US20080193237A1 (en) * 2007-02-12 2008-08-14 Iscar, Ltd. Rotary Cutting Tool Having Releasably Mounted Self-Clamping Cutting Head With Locking Member

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2361708A1 (en) * 2009-12-08 2011-08-31 OSG Corporation Throw-away rotary tool
EP2361708A4 (en) * 2009-12-08 2011-10-26 Osg Corp Throw-away rotary tool
US8931982B2 (en) 2009-12-08 2015-01-13 Osg Corporation Throw-away rotating tool
US20130004253A1 (en) * 2011-07-02 2013-01-03 Kennametal, Inc. Drilling/reaming tool
US8926236B2 (en) * 2011-07-02 2015-01-06 Kennametal Inc. Drilling/reaming tool
CN102380651A (en) * 2011-10-13 2012-03-21 东阳市速博数控刀具有限公司 Milling cutter for cutting carbide alloy with high speed
US9358626B2 (en) 2011-11-15 2016-06-07 Kennametal Inc. Manufacturing of holemaking tools
US20140017022A1 (en) * 2012-07-11 2014-01-16 Kennametal, Inc. Coupling point for a modular rotary tool and tool head carrier for a modular rotary tool
US9296049B2 (en) * 2012-07-11 2016-03-29 Kennametal Inc. Coupling point for a modular rotary tool and tool head carrier for a modular rotary tool

Also Published As

Publication number Publication date
EP2504119A1 (en) 2012-10-03
SE0950891A1 (en) 2011-05-25
SE535180C2 (en) 2012-05-08

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