WO2003024661A9 - Milling cutter with coolant conduits - Google Patents
Milling cutter with coolant conduitsInfo
- Publication number
- WO2003024661A9 WO2003024661A9 PCT/IL2002/000764 IL0200764W WO03024661A9 WO 2003024661 A9 WO2003024661 A9 WO 2003024661A9 IL 0200764 W IL0200764 W IL 0200764W WO 03024661 A9 WO03024661 A9 WO 03024661A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutter
- conduits
- cutting
- end mill
- coolant
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/06—Drills with lubricating or cooling equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/28—Features relating to lubricating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/10—Arrangements for cooling or lubricating tools or work
Definitions
- the present invention relates to milling cutters.
- the invention is concerned with an end mill provided with a new arrangement of coolant conduits to improve cutter performance and to produce workpieces having a finer surface finish.
- the coolant is usually a liquid, (although it is possible to use a gas jet, which has advantages for the machining of cast iron) such liquid commonly comprising an aqueous solution of a soluble cutting oil.
- Water alone is an excellent coolant but is not used mainly to avoid rusting of the machine tool. Petroleum-based fluids are used where friction reduction and protection from welding action are of prime importance.
- the coolant also helps to avoid overheating of the work piece, washes away the generated chips to improve surface finish and provides some lubrication for surfaces of the cutting tool which rub against the workpiece, thereby reducing tool forces.
- the coolant In short simple operations the coolant is often applied manually by the operator using a brush or spouted can. In production work a jet of coolant is pumped through piping from a reservoir and directed at the cutter, the used coolant being filtered and reused. This method often requires splash guards. A more serious problem is that, as has been reported by various researchers, the coolant does not reach the cutting edges. Particularly in slotting operations using an end mill, the abundant supply of coolant does not ensure that the cutting teeth most in need thereof are directly cooled and lubricated adequately; cooling is effected by conduction of heat from the cutting edges through the exposed body of the cutter which is easy to cool, provided it is not revolving so fast that centrifugal forces remove the coolant before it can do its work.
- a further disadvantage of prior art end mills of the type having a central coolant conduit is that the long bore, aside from being difficult to manufacture, causes some loss of hydraulic pressure. Further pressure is lost as the coolant is forced to traverse a sharp angle on leaving the central bore. The resultant coolant flow is then too low to achieve effective chip evacuation, and too little heat is removed from the tool. Yet a further disadvantage of this type of prior-art end-mill cutters is that the secondary conduit channels extend close to the outer diameter of the cutter. The resulting stress concentration in the vicinity of the cross-holes causes disastrous weakness in small diameter cutters, although in large diameter cutters the problem is of little consequence.
- the present invention achieves the above objects by providing an end mill cutter provided with a shank end, and a cutting end composed of a plurality of teeth each having a cutting edge and a back face, the cutter being provided with internal coolant conduits.
- the conduits comprise a center conduit extending along the central axis from the shank end to near the cutting end, and a plurality of secondary conduits substantially parallel to and spaced apart from the central axis and to/from each other, the secondary conduits extending from the back face of the teeth at the cutting end into the center conduit to provide fluid communication therewith.
- an end mill cutter wherein the center conduit has a larger diameter at the shank end and a smaller diameter near the cutting end.
- an end mill cutter wherein in a cross-section taken along the central axis the center conduit has a parabolic form.
- U.S. Patent no. 5,820,313 Weber describes and claims a rotating shaft tool in which a main coolant channel extends longitudinally.
- a cutter head connected to the shaft has chip grooves and a groove discharge region, which is covered by a sleeve.
- the sleeve covers feed channels formed between the main channel and the groove discharge. At least one feed channel is parallel to the main channel and is curved to reach the groove discharge area.
- the coolant is thus discharged from the bottom of the open sleeve into the teeth grooves, there being no guarantee that the fluid will reach the lowest cutting edges.
- FIG. 1 in the Weber patent shows the sleeve end to be far away from the cutter end, and it cannot be brought into closer proximity thereto because the sleeve covers required cutting edges at the sides of the cutter.
- the cutter of the present invention discharges coolant at the cutter extremity very near to the bottom cutting edges.
- cooling and lubrication are more effective, and swarf is washed out not only from the bottom of the slot being machined but also from the sides thereof.
- the improved swarf removal is an important factor in improving the surface finish of the workpiece. It will thus be realized that the novel cutter of the present invention serves to apply coolant during a slot milling operation in very close proximity to where it is required. Improved machinability and extended tool life result not only from better cooling and lubrication of the cutting zone but also from removing swarf in a more effective manner than has been done previously.
- End mill cutters are also subjected to a reversing bending torque. What has been explained regarding twisting applies also with regard to bending.
- the secondary conduits are in proximity to the central axis, i.e. in an area where strain, and therefor stress, are close to the minimum, and for this reason do not weaken the cutter to any noticeable extent.
- FIG. 1 is a partially sectioned elevational view of a prior art end mill in use, showing a dense accumulation of chips near the cutting end;
- FIG. 2 is a partially sectioned elevational view of a preferred embodiment of the end mill according to the invention showing the coolant washing out chips from tlie cutting end;
- FIG. 3 is an end view of a two-tooth end mill cutter
- FIG. 4 is a sectioned elevational view of an embodiment provided with an enlarged central conduit
- FIG. 5 is a sectioned elevational view of an embodiment having a shaped central conduit
- FIG. 6 is an end view of a three-tooth end mill cutter
- FIG. 7 is an end view of a four-tooth end mill cutter.
- FIG. 8 is an elevational view of an embodiment having additional side conduits;
- FIG. 9 is a cross-section taken at AA in FIG. 8;
- FIG. 10 is an elevational cross-section taken at CC in FIG. 9;
- FIG. 11 is an elevational partly cross-sectional view taken at CC in FIG. 9;
- FIG. 12 is a cross-section taken at BB in FIG. 8.
- FIG. 1 There is seen in FIG. 1 a prior art end mill cutter 10.
- a central coolant conduit 12 receives high pressure fluid at the shank end 14 of the cutter. Fluid reaches the end of the central conduit 12, from where flow is split into a plurality of secondary conduits 16, which branch off the central conduit 12 at an angle and enter the channel being milled 18 at an intermediate depth. Little flow takes place below this depth, as pressures on both sides of the cutter are about equal. If fluid pressure is adequate chips 20 generated above this depth are washed out. There is no assurance that coolant reaches the cutting edges 22.
- FIG. 2 there is seen an end mill cutter 30 according to the present invention.
- the cutter is provided with a shank end 32, and a cutting end 34 composed of a plurality of teeth 36 each having a cutting edge 38 and a back face 40 visible in FIG. 3.
- the cutter 30 has internal conduits for a high pressure coolant/lubricant.
- a center conduit 42 extends along the central axis from the shank end 32 to near tlie cutting end 34.
- the axes of the two secondary conduits 44 are disposed substantially parallel to and spaced apart by a short distance from the central axis. Consequently tlie secondary conduits 44 are also parallel to each other.
- the secondary conduits 44 extend into tlie center conduit 42 to provide fluid communication therewith, and extend through the back face 40 of the teeth 36 at the cutting end 34 to supply coolant very near to the cutting zone.
- the coolant arrives in the zone where it is most effective to cool and lubricate the cutter, and thereafter exiting washes chips 20 away from the whole profile of the cutter.
- FIG. 3 illustrates an end mill cutter 48 wherein each tooth 50 is provided with a secondary coolant conduit 52.
- the cutter has two teeth 50 and the same number of secondary conduits 52.
- Seen in FIG. 4 is an end mill cutter 54 similar to the cutter 30 seen in FIG. 2.
- the center conduit has a larger diameter 56 at the shank end and a smaller diameter 58 near the cutting end. Elimination of the long small diameter bore of the conduit 42 seen in FIG. 2, which may have a length/diameter ratio exceeding 25:1, serves to ease manufacture of the cutter 54 and also reduces hydraulic pressure loss along the central conduit 56.
- FIG. 5 there is depicted an end mill cutter 60 similar to the cutter 54 seen in FIG. 4.
- the shank portion of the center conduit 62 has a parabolic form. This form further improves fluid flow through the center conduit.
- the present embodiment is particularly advantageous for carbide cutters produced by powder metallurgy, as the smaller volume of the present embodiment results in material savings during cutter manufacture.
- FIG. 6 shows a three-tooth end mill cutter 64. The figure shows a suitable arrangement for positioning the two coolant outlets 66 relative to the three teeth 68.
- FIG. 7 illustrates a four-tooth cutter 70 provided with two coolant outlets 72.
- an end mill cutter 74 further provided with two transverse conduits 76 extending from the center conduit 12 to a side of the cutter and between the teeth 36 thereof. This arrangement is useful where a stronger coolant flow is required in addition to flow originating from the two secondary conduits 16 parallel to and spaced apart from the central conduit 12.
- the number of transverse conduits 76 is equal to the number of cutter teeth 36.
- FIGS. 11.and 12 show a further four-tooth end mill cutter 78 provided with transverse conduits 80 extending from the secondary conduits 16 to a side of the cutter 78 and between the teeth 36 thereof.
- traverse conduits 16 may be drilled at other than right angles to the cutter center axis.
- the chosen design is selected on the basis of the material to be machined, depth of cut required, cutter feed, required tool rigidity and other factors such as coolant viscosity and available coolant pump pressure.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
- Milling Processes (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003528349A JP2005502484A (en) | 2001-09-17 | 2002-09-12 | Milling with coolant conduit |
EP02772768A EP1472044A1 (en) | 2001-09-17 | 2002-09-12 | Milling cutter with coolant conduits |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL14549901A IL145499A0 (en) | 2001-09-17 | 2001-09-17 | Milling cutter with coolant conduits |
IL145499 | 2001-09-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2003024661A1 WO2003024661A1 (en) | 2003-03-27 |
WO2003024661A9 true WO2003024661A9 (en) | 2004-04-08 |
Family
ID=11075796
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IL2002/000764 WO2003024661A1 (en) | 2001-09-17 | 2002-09-12 | Milling cutter with coolant conduits |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1472044A1 (en) |
JP (1) | JP2005502484A (en) |
IL (1) | IL145499A0 (en) |
WO (1) | WO2003024661A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202006007085U1 (en) * | 2006-05-03 | 2006-08-17 | Hofmann & Vratny Ohg | Milling tool with cooling channel system for milling workpieces has at least some branch channels angled relative to longitudinal axis of central cooling channel |
FR2910358A3 (en) * | 2006-12-21 | 2008-06-27 | Renault Sas | Stripping tool for e.g. oil hole in motor vehicle crankshaft, has cutting edges arranged along corresponding helix profiles in opposed directions for allowing alternative cutting of burrs during progression of tool in each of borings |
DE102009030470B4 (en) * | 2009-06-24 | 2015-12-24 | Johne & Co. Präzisionswerkzeuge GmbH | Replaceable head holder system and tool head element |
JP5870734B2 (en) * | 2012-02-15 | 2016-03-01 | 三菱マテリアル株式会社 | End mill with coolant hole |
JP2013188843A (en) * | 2012-03-14 | 2013-09-26 | Mitsubishi Materials Corp | Ball end mill comprising coolant hole |
JP5958277B2 (en) * | 2012-10-29 | 2016-07-27 | 三菱マテリアル株式会社 | End mill with coolant hole |
DE102013210355B4 (en) | 2013-06-04 | 2022-11-17 | Kennametal Inc. | Cutting tool and method for producing a cutting tool |
US20170239740A1 (en) * | 2014-09-23 | 2017-08-24 | Danske Vaerktoej Aps | Thread cutting tap |
DE102015106374A1 (en) | 2015-04-24 | 2016-10-27 | Gühring KG | Rotary tool with tapered coolant channel and staggered coolant outlet lines and related manufacturing process |
JP6362802B1 (en) | 2018-01-23 | 2018-07-25 | 株式会社松浦機械製作所 | Cutting tools |
US20210299764A1 (en) * | 2020-03-24 | 2021-09-30 | The Boeing Company | Tool bit, a tooling assembly for applying a fluid to a surface, and a method |
DE102020112808A1 (en) * | 2020-05-12 | 2021-11-18 | Kennametal Inc. | Cutting tool and method of making a cutting tool |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0373111B1 (en) * | 1988-12-02 | 1993-03-17 | Institut Straumann Ag | Device for treating a bone, especially a jaw bone and/or a tooth |
JPH11508829A (en) * | 1995-07-14 | 1999-08-03 | ケンナメタル ヘルテル アクチェンゲゼルシャフト ウェルクツォイゲ ウント ハルトシュトッフェ | Drill with cooling lubricant passage |
DK0883455T3 (en) * | 1996-02-29 | 2002-02-25 | Komet Stahlhalter Werkzeug | Drilling tools for machine tools and methods for making them |
-
2001
- 2001-09-17 IL IL14549901A patent/IL145499A0/en unknown
-
2002
- 2002-09-12 WO PCT/IL2002/000764 patent/WO2003024661A1/en not_active Application Discontinuation
- 2002-09-12 EP EP02772768A patent/EP1472044A1/en not_active Withdrawn
- 2002-09-12 JP JP2003528349A patent/JP2005502484A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
JP2005502484A (en) | 2005-01-27 |
WO2003024661A1 (en) | 2003-03-27 |
IL145499A0 (en) | 2002-06-30 |
EP1472044A1 (en) | 2004-11-03 |
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