SE1450906A1 - Coupling mechanism for cutting tool - Google Patents

Coupling mechanism for cutting tool Download PDF

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Publication number
SE1450906A1
SE1450906A1 SE1450906A SE1450906A SE1450906A1 SE 1450906 A1 SE1450906 A1 SE 1450906A1 SE 1450906 A SE1450906 A SE 1450906A SE 1450906 A SE1450906 A SE 1450906A SE 1450906 A1 SE1450906 A1 SE 1450906A1
Authority
SE
Sweden
Prior art keywords
threaded portion
shank
cutting tool
disposed
pitch
Prior art date
Application number
SE1450906A
Other languages
English (en)
Other versions
SE541240C2 (en
Inventor
Leonid Sharivker
Sergei Boulakhov
Christoph Gey
Yosi Harush
Alan Bookheimer
Uzi Levy
stephen michael George
Ruy Frota De Souza
Original Assignee
Kennametal Inc
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 Kennametal Inc filed Critical Kennametal Inc
Publication of SE1450906A1 publication Critical patent/SE1450906A1/sv
Publication of SE541240C2 publication Critical patent/SE541240C2/en

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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
    • B23C5/109—Shank-type cutters, i.e. with an integral shaft with removable cutting inserts
    • 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
    • B23C5/06—Face-milling cutters, i.e. having only or primarily a substantially flat cutting surface
    • 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
    • B23B51/0002—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position
    • B23B51/0003—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position with exchangeable heads or inserts
    • B23B51/0004—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position with exchangeable heads or inserts with cutting heads or inserts attached by screw means
    • 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
    • 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
    • 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
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/11—Retention by threaded connection
    • 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
    • B23C—MILLING
    • B23C2240/00—Details of connections of tools or workpieces
    • B23C2240/32—Connections using screw threads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
    • F16B39/30—Locking exclusively by special shape of the screw-thread
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/907—Tool or Tool with support including detailed shank
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9098—Having peripherally spaced cutting edges with means to retain Tool to support

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Drilling Tools (AREA)
  • Milling, Broaching, Filing, Reaming, And Others (AREA)

Abstract

Ett roterande skärverktyg (10) innefattande en fräs (14) av väsentligen cylindriskform anordnad kring en central längdaxel (A). Fräsen (14) har en forsta ände med ettaktivt slipat parti (16) och en motsatt andra ände, och den andra änden har ett utvändigtgängat parti (22) anordnat däromkring. Skärverktyget (10) innefattar dessutom ett skaft(12) av väsentligen cylindrisk forrn anordnad kring den centrala längdaxeln (A), ochskaftet (12) har ett försänkt invändigt gängat parti (32) forrnat i en forsta ände. Detutvändigt gängade partiet (22) innefattar ett antal gängor (22a) anordnade med en förstastigning (P1) och det invändigt gängade partiet (32) innefattar ett antal gängor (32a)anordnade med en andra stigning (P2) som är olik den forsta stigningen (P1). Den andrastigningen (P2) är konstant längs det invändigt gängade partiet (32). Fräsen (14) ochskaftet (12) är selektivt kopplade via gängat ingrepp mellan det utvändigt gängadepartiet (22) och det invändigt gängade partiet (32).

Description

30 35
[0005] bore, are necessary because the threaded coupler by its own is not sufficiently The described pilot, concentric aligner, pilot bore and concentric accurate for such repeated replacement of cutters.
[0006] For instance, U.S. Pat. No. 6,485,220 discloses a frustoconical radial alignment Further improvements to the above basic concept are also known. instead of a cylindrical alignment, as Well as a strengthened thread root and U.S.
Pat. No. 7,329,073 describes adjacent axial and radial stop surfaces.
[0007] restrictive production requirements. Typical production tolerances of the Nevertheless all the above described solutions suffer from cylindrical mating surfaces on the cutter and shank, sufficient for satisfying the need of replaceable cutters falling repeatedly in the desired range of concentricity and axis position, are less than 5 micrometers. Such close tolerances necessitate an additional grinding process.
[0008] yet also very brittle. Direct coupling of the hard cutter to the steel shank imposes Furthermore, sintered carbide cutters by their nature are very hard stresses on the coupling Where the two different materials engage. More particularly, in cases Where a carbide cutter is threaded into a steel shank, failure of the connection is likely to occur at or near the base of the threaded portion of the carbide cutter, Which commonly also damages the steel shank, rendering it unsuitable for reuse.
[0009] use With rotary cutting tools and also to rotary cutting tools including such Hence there is room for improvement in coupling mechanisms for coupling mechanisms.
SUMMARY OF THE INVENTION
[0010] As one aspect of the present invention a rotary cutting tool is provided. The rotary cutting tool comprises a cutter of generally cylindrical shape disposed about a central longitudinal axis. The cutter includes a first end having an active fluted portion and an opposite second end, the second end having a male threaded portion disposed thereabout. The rotary cuting tool fiarther comprises a shank of generally cylindrical shape disposed about the central longitudinal axis, the shank having a recessed female threaded portion formed in a first end. The male threaded portion includes a number of threads disposed at a first pitch and the female threaded portion includes a number of threads disposed at a second pitch different than the first pitch. The cutter and the shank are selectively coupled via threaded engagement of the male threaded portion and the female threaded portion. [00 1 1]
[0012] The first pitch may be less than the second pitch.
The first pitch may be about .005 mm less than the second pitch. 2 10 15 20 25 30 35
[0013] in the range of about 0.002 to about 0.010 mm.
[0014] may be formed from a tool steel.
[0015] extending a distance along the central longitudinal axis disposed between the The difference between the first pitch and the second pitch may be The cutter may be formed from a carbide material and the shank The cutter may comprise an outward facing circumferential surface active fluted portion and the male threaded portion, the shank may comprise an inward facing circumferential surface extending a distance along the central longitudinal axis between the female threaded portion and the first end of the shank, and the outward facing circumferential surface may be disposed adjacent to, and facing the inward facing circumferential surface when the male threaded portion and the female threaded portion are threadedly engaged.
[0016] form of a portion of a truncated cone disposed at a first angle with respect to the The outward facing circumferential surface may be generally in the central longitudinal axis and the inward facing circumferential surface may be generally in the form of a portion of a truncated cone disposed at a second angle with respect to the central longitudinal axis.
[0017] The first angle may be in the range of about 1° to about 7°.
[0018] The second angle may be in the range of about l° to about 7°.
[0019] The outward facing circumferential surface may be generally a cylindrical surface disposed parallel to the central longitudinal axis and the inward facing circumferential surface may be generally a cylindrical surface disposed parallel to the central longitudinal axis.
[0020] extending a distance along the central longitudinal axis disposed adj acent the male The cutter may comprise an outward facing circumferential surface threaded portion and opposite the active fluted portion, the shank may comprise an inward facing circumferential surface extending a distance along the central longitudinal axis adj acent the female threaded portion opposite the first end of the shank, and the outward facing circumferential surface may be disposed adjacent to, and facing the inward facing circumferential surface when the male threaded portion and the female threaded portion are threadedly engaged.
[0021] angle in the range of 0° to about 6° with respect to the central longitudinal axis.
[0022] the range of 0° to 2° of the angle of the outward facing circumferential surface.
[0023] surface extending a distance along the central longitudinal axis disposed between The outward facing circumferential surface may be disposed at an The inward facing circumferential surface may be disposed within The cutter may comprise a first outward facing circumferential the active fluted portion and the male threaded portion and a second outward 3 10 15 20 25 30 35 facing circumferential surface extending a distance along the central longitudinal axis adj acent the male threaded portion and opposite the active fluted portion, the shank may comprise a first inward facing circumferential surface extending a distance along the central longitudinal axis between the female threaded portion and the first end of the shank and a second inward facing circumferential surface extending a distance along the central longitudinal axis adjacent the female threaded portion opposite the first end of the shank, the first outward facing circumferential surface may disposed adjacent to, and facing the first inward facing circumferential surface when the male threaded portion and the female threaded portion are threadedly engaged, and the second outward facing circumferential surface may be disposed adj acent to, and facing the second inward facing circumferential surface when the male threaded portion and the female threaded portion are threadedly engaged.
[0024] provided. The rotary cutting tool comprises: a cutter of generally cylindrical shape As another aspect of the present invention, a rotary cutting tool is disposed about a central longitudinal axis, the cutter having a first end having an active fluted portion and an opposite second end, the second end having a male threaded portion disposed thereabout; and a shank of generally cylindrical shape disposed about the central longitudinal axis, the shank having a recessed female threaded portion formed in a first end. The male threaded portion includes a number of threads disposed at a first pitch and at a first taper angle, the female threaded portion includes a number of threads disposed at a second pitch and at a second taper angle different than the first taper angle, and the cutter and the shank are selectively coupled via threaded engagement of the male threaded portion and the female threaded portion.
[0025]
[0026] may be less than the second pitch.
The first taper angle may be less than the second taper angle.
The first pitch may be equal to the second pitch or the first pitch BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Concepts of the present invention will now be described in connection with certain non-limiting embodiments with reference to the following illustrative figures so that it may be more fully understood.
[0028] that the particulars shown are by way of example and for purpose of illustrative With specific reference now to the figures in detail, it is stressed discussion of the preferred embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the 4 10 15 20 25 30 35 invention. In this regard, no attempt is made to show structural details of the invention in more detail than is necessary for a fundamental understanding of the invention, the description taken with the drawings making apparent to those skilled in the art how the several forrns of the invention may be embodied in practice.
[0029] modular rotary cutting tool in accordance With the present invention.
[0030] with the shank portion shown in cross-section.
FIG. 1 shows an isometric view of an example embodiment of a FIG. 1B shows a side view of the modular cutting tool of FIG. 1
[0031] FIG. 2 shows an exploded isometric view of the modular cutting tool ofFIG. 1.
[0032] FIG. 3 shows an exploded side view of the modular cutting tool of FIG. 1 with the shank portion shown in cross-section to show intemal details.
[0033] cutting tool of FIG. 1.
FIG. 4 shows a detail side view of the cutter portion of the rotary
[0034] FIG. 5 shows a detail cross-sectional view of a portion of the shank portion of the rotary cutting tool of FIG. 1.
[0035] FIG. 6 shows a side view of another example embodiment of a coupling mechanism in accordance the present invention shown partially in cross- section to show intemal details.
[0036] embodiment of a modular cutting tool in accrodance with the present invention FIG. 7 shows an exploded side view of another example with the shank portion shown in cross-section to show intemal details.
[0037] In the figures, equivalent parts are provided with the same reference signs.
DESCRIPTION OF EXEMPLARY EMBODIMENTS
[0038] As used herein, the term “number” shall refer to any non-zero quantity (i.e., one or any quantity greater than one).
[0039] As used herein, the term “selectively coupled” shall mean that two or more components are coupled or j oined together in a manner which may be selectively undone (i.e., uncoupled) without damaging either of the components.
[0040] parallel to a central axis of a threaded member between corresponding points on As used herein, the term “pitch” shall refer to the distance measured adjacent thread forrns in the same axial plane and on the same side of the axis.
[0041] example embodiment of the invention disposed about a central longitudinal axis A.
FIGS. 1-5 show a modular rotary cutting tool 10 according to a first Cutting tool 10 includes a reusable shank 12 and a replaceable cutter 14, selectively coupled together by a coupling mechanism (not numbered) formed 5 10 15 20 25 30 35 from cooperating portions of each of shank 12 and cutter 14 which are discussed in detail below. In the example embodiment shown in FIGS. 1-5, cutter 14 is in the form of an end mill formed from a carbide material, however, it is to be appreciated that another rotary cutting tool, e.g., without limitation, a face mill, rounded tip mill, slitting mill, drill, reamer, or any other replaceable tip for milling, drilling, reaming or other metal cutting applications, formed from carbide or other suitable material or materials may be employed without varying from the scope of the present invention. Shank 12 may be formed from steel, carbide or other suitable material formed in a generally cylindrical shape with a slightly stepped portion, however, it is to be appreciated that other cross-sections, shapes, and materials may also be employed without varying from the scope of the present invention. It is also to be appreciated that shank 12 may be formed as a generally solid member, as shown in the illustrated embodiment of FIGS. 1-5, or may include one or more intemal passages through which a flow of coolant and/or lubricant may be provided to cutter 14.
[0042] (when installed in shank 12) may include an active fluted portion 16 structured to Continuing to refer to FIG. 1, the exposed portion of the cutter 14 perform cutting operations on a workpiece (not shown), followed by a short cylindrical portion 18. The cylindrical portion 18 is preferably equipped with at least two opposing parallel flats 20 (only one visible in F IG. 1) formed therein/on, on which a standard spanner wrench (not shown) may engage for installing or removing cutter 14 from shank 12, as discussed further below.
[0043] The exploded views of FIGS. 2 and 3 and detail views of FIGS. 4 and 5 show details of the portions of shank 12 and cutter 14 which form the coupling mechanism between cutter 14 and shank 12. More particularly, the coupling mechanism includes, as part of cutter 14: an outwardly protruding male threaded portion 22 extending opposite active fluted portion 16; a radial aligner portion 28 disposed concentric to the longitudinal axis A and extending between the short cylindrical portion 18 and the threaded portion 22; and a flat axial stop shoulder 30 which bridges the radial gap between the smaller diameter, radial aligner 28, and the larger diameter, short cylindrical portion 18. As shown in the illustrated example embodiment, shoulder 30 may disposed perpendicular to the longitudinal axis A. In other embodiments, shoulder 30 may be slightly inclined (up to +/-3°) to a reference drawn perpendicular to the longitudinal axis A.
[0044] generally smooth alignment bore 24 disposed concentric to longitudinal axis A, a The coupling mechanism also includes, as part of shank 12: a female threaded bore 32 extending from the alignment bore 24, and an axial stop 10 15 20 25 30 35 surface 34 disposed perpendicular to the longitudinal axis A at an end of shank 12 adjacent the alignment bore 24.
[0045] aligner portion 28 is formed generally as a portion of a truncated cone and includes Referring to the detail view of cutter 14 shown in FIG. 4, the radial an outward facing circumferential surface 29 disposed at an angle Ö1 relative to longitudinal axis A. In example embodiments of the present invention, the angle 51 is generally in the range of about 1° to about 7°. Altematively, radial aligner portion 28 may be of generally cylindrical shape (i.e., 81 = 0 degrees). In general, a truncated cone has been found to be preferable when the cutter 14 is coupled with steel shanks while the cylindrical shape has been found to be preferable when the cutter 14 is coupled with carbide shanks.
[0046] shank 12 shown in FIG. 5, the alignment bore 24 is formed in a generally Referring to the cross-sectional detail View of an end portion of corresponding shape to aligner portion 28. In general, the diameter of the aligner portion 28 may be slightly larger (preferred for steel shanks) or equal to (preferred for carbide shanks) than the diameter of the alignment bore 24.
[0047] shape to aligner portion 28, in the illustrated embodiment alignment bore 24 is also As the alignment bore 24 is formed in a generally corresponding formed generally as a portion of a truncated cone and includes an inward facing circumferential surface 25 disposed at an angle 52 relative to the longitudinal axis A. As the inward facing circumferential surface 25 of shank 12 generally cooperates with the outward facing circumferential surface 29 of cutter 14, in example embodiments of the present invention, the angle 52 generally is in the range of from about 0° to about 7° depending on the angle 81 of the outward facing circumferential surface 29.
[0048] Referring to FIGS. 4 and 5, threaded portion 22 of cutter 14 includes a number of threads 22a, preferably at least 4 (although other numbers may be employed), disposed at a first pitch P1 about longitudinal axis A and threaded bore 32 includes at least a corresponding number of female threads 32a disposed about longitudinal axis A at a second pitch P2, which is different than P1.
In the example embodiment shown in FIGS. 1-5, the second pitch P2 is greater than the first pitch P1 by about .005 mm. By utilizing a larger pitch P2 in the threaded bore 34 of the shank 12, and thus a smaller pitch P1 in cutter 14, the resulting stress on threaded portion 22 of cutter 14 when coupled with shank 12 is dispersed more evenly among the threads 22a as compared to an embodiment in which cooperating threads of generally the same pitch are utilized. In example embodiments of the present invention, thread pitches varying from about 0.002-0.010 mm between the respective threads of the shank 12 and cutter 14 have been employed. In contrast 7 10 15 20 25 30 35 to embodiments of the present invention, in instances where cooperating threads of generally the same pitch are utilized stress is generally concentrated at the thread closest to axial stop shoulder 30 due to the general inelasticity of the carbide or steel cutter 14. By more evenly distributing the stress among the threads 22a of threaded portion 22, embodiments of the present invention allow for higher loads to be applied to the connection before failure.
[0049] engaging the threaded portion 22 of cutter 14 with the threaded bore 32 of the shank 12 and subsequently rotating one or both of the cutter 14 and/or shank 12 Assembly of the modular cutting tool assembly 10 is performed by until the radial aligner portion 28 of cutter 14 is seated within the alignment bore 24 of shank 12 and the axial stop shoulder 30 of the cutter 14 abuts the axial stop surface 34 of the shank 12. The axial position of cutter 14 with respect to shank 12 is derived from the direct contact of stop shoulder 30 of cutter 14 with the axial stop surface 34 of shank 12. Once stop shoulder 30 and stop surface 34 are engaged, the coupling is preferably further tightened to a specified torque using a torque limiting wrench to avoid excessive tension of the cutter 14.
[0050] mechanism between a shank 12” (shown in cross-section) and a cutter 14” of a FIG. 6 shows a detail view of another embodiment of a coupling modular cutting tool 10”. The cutting tool 10” may be of similar outward appearance to cutting tool 10, previously described, and cutter 14” and shank 12” interact in a similar manner as cutter 14 and shank 12 aside from the inclusion of a second radial aligner portion 40 disposed adj acent threaded portion 22 opposite radial aligner portion 28. When cutter 14” is coupled with shank 12”, such as shown in FIG. 6, the outward facing circumferential surface (not numbered) of the second radial aligner portion 40 engages the inward facing circumferential surface (not numbered) of a second alignment bore 42 formed in shank 12” adjacent threaded bore 32 opposite first alignment bore 24. In example embodiments of the present invention, radial aligner portion 40 is of generally similar, or slightly smaller diameter than the diameter of the second alignment bore 42. Also, the surface (not numbered) of second radial aligner portion 40 may be disposed at angles ranging from 0° to about 6° with respect to the central longitudinal axis A, while the surface (not numbered) of the second alignment bore 42 may be disposed at the same angle, or within a range of 1°-2° of the angle of the surface of the second radial aligner portion 40. Although shown having second radial aligner portion 40 in addition to radial aligner portion 28, it is to be appreciated that embodiments of the present invention may include only second radial alignment portion 40 without radial alignment portion 28. 10 15 20 25 30 35
[0051] embodiment of a modular cutting tool 50 in accordance with the present invention FIG. 7 shows an exploded side view of another example which includes a shank 52 and a cutter 54 coupled via another coupling mechanism in accordance with the present invention. Shank 52 and cutter 54 may be of generally similar construction as shanks 12, 12” and cutters 14, 14” previously described and respectively include a female threaded bore 58 (including female threads 58a, 58b) and a male threaded portion 60 (including male threads 60a, 60b). However, unlike the embodiments previously discussed, in which different thread pitches on the male and female threaded portions were utilized to ditrubute stress more evenly throughout the threads when the two components were tightly threadely coupled together, the embodiment illustrated in FIG. 7 accomplishes a similar result by orienting the male and female threaded portions at different angles with respect to each other. For example, in the embodiment illustrated in FIG. 7, the threads 60a, 60b of the male threaded portion 60 are disposed at a first taper angle org (measured with respect to a reference disposed parallel to the central longitudinal axis A) while the threads 58a, 58b of the female threaded bore 58 are disposed at a second taper angle org (measured with respect to a reference disposed parallel to the central longitudinal axis A). More particularly, by disposing the female threads 58a, 58b at a second taper angle org greater than the first taper angle orC of the male threads 60a, 60b, a spatial relationship between the male and female threaded portions 58, 60 similar to that created by the use of different thread pitches as previously discussed is created even when the thread pitches PS and PC are the same. It is to be appreciated that such embodiment could also be utilized with different thread pitches PS and PC as an alternative to being used with portions having the same pitch.
[0052] is provided with a threaded bore for engaging a complementary male thread on the Although in the particular embodiments described herein the shank cutter, the reverse is also possible whereby the shank is provided with a protruding male threaded portion, and the cutter is provided with an internally threaded bore.
[0053] limited to the details of the foregoing illustrated embodiments and that the present It will be evident to those skilled in the art that the invention is not invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be tip embraced therein.

Claims (18)

10 15 20 25 30 35 CLAIMS What is claimed is:
1. l. A rotary cutting tool comprising: a cutter of generally cylindrical shape disposed about a central longitudinal axis, the cutter having a first end having an active fluted portion and an opposite second end, the second end having a male threaded portion disposed thereabout; and a shank of generally cylindrical shape disposed about the central longitudinal axis, the shank having a recessed female threaded portion forrned in a first end, Wherein the male threaded portion includes a number of threads disposed at a first pitch and the female threaded portion includes a number of threads disposed at a second pitch different than the first pitch, and Wherein the cutter and the shank are selectively coupled via threaded engagement of the male threaded portion and the female threaded portion.
2. The rotary cutting tool of claim l wherein the first pitch is less than the second pitch.
3. The rotary cutting tool of claim 2 wherein the first pitch is about .005 mm less than the second pitch.
4. The rotary cutting tool of claim l wherein the difference between the first pitch and the second pitch is in the range of about 0.002 to about 0.010 mm.
5. The rotary cutting tool of claim l wherein the cutter is formed from a carbide material and wherein the shank is formed from a tool steel.
6. The rotary cutting tool of claim l Wherein: the cutter comprises an outward facing circumferential surface extending a distance along the central longitudinal axis disposed between the active fluted portion and the male threaded portion; the shank comprises an inward facing circumferential surface extending a distance along the central longitudinal axis between the female threaded portion and the first end of the shank; and the outward facing circumferential surface is disposed adjacent to, and faces the inward facing circumferential surface when the male threaded portion and the female threaded portion are threadedly engaged. 10 10 15 20 25 30 35
7. The rotary cutting tool of claim 6 Wherein the outWard facing circumferential surface is generally in the form of a portion of a truncated cone disposed at a first angle With respect to the central longitudinal axis and Wherein the inward facing circumferential surface is generally in the form of a portion of a truncated cone disposed at a second angle with respect to the central longitudinal axis.
8. The rotary cutting tool of claim 7 Wherein the first angle is in the range of about l° to about 7°.
9. The rotary cutting tool of claim 8 Wherein the second angle is in the range of about l° to about 7°.
10. The rotary cutting tool of claim 6 Wherein the outWard facing circumferential surface is generally a cylindrical surface disposed parallel to the central longitudinal axis and Wherein the inWard facing circumferential surface is generally a cylindrical surface disposed parallel to the central longitudinal axis.
11. ll. The rotary cutting tool of claim l Wherein: the cutter comprises an outWard facing circumferential surface extending a distance along the central longitudinal axis disposed adjacent the male threaded portion and opposite the active fluted portion; the shank comprises an inWard facing circumferential surface extending a distance along the central longitudinal axis adj acent the female threaded portion opposite the first end of the shank; and the outWard facing circumferential surface is disposed adjacent to, and faces the inward facing circumferential surface When the male threaded portion and the female threaded portion are threadedly engaged.
12. The rotary cutting tool of claim ll Wherein the outWard facing circumferential surface is disposed at an angle in the range of 0° to about 6° With respect to the central longitudinal axis.
13. The rotary cutting tool of claim 12 Wherein the inWard facing circumferential surface is disposed Within the range of 0° to 2° of the angle of the outWard facing circumferential surface. ll 10 15 20 25 30 35
14. The rotary cutting tool of claim 1 Wherein: the cutter comprises a first outward facing circumferential surface extending a distance along the central longitudinal axis disposed between the active fluted portion and the male threaded portion and a second outWard facing circumferential surface extending a distance along the central longitudinal axis adjacent the male threaded portion and opposite the active fluted portion; the shank comprises a first inWard facing circumferential surface extending a distance along the central longitudinal axis between the female threaded portion and the first end of the shank and a second inWard facing circumferential surface extending a distance along the central longitudinal axis adj acent the female threaded portion opposite the first end of the shank; the first outward facing circumferential surface is disposed adj acent to, and faces the first inWard facing circumferential surface When the male threaded portion and the female threaded portion are threadedly engaged; and the second outWard facing circumferential surface is disposed adjacent to, and faces the second inWard facing circumferential surface When the male threaded portion and the female threaded portion are threadedly engaged.
15. A rotary cutting tool comprising: a cutter of generally cylindrical shape disposed about a central longitudinal axis, the cutter having a first end having an active fluted portion and an opposite second end, the second end having a male threaded portion disposed thereabout; and a shank of generally cylindrical shape disposed about the central longitudinal axis, the shank having a recessed female threaded portion formed in a first end, Wherein the male threaded portion includes a number of threads disposed at a first pitch and at a first taper angle, Wherein the female threaded portion includes a number of threads disposed at a second pitch and at a second taper angle different than the first taper angle, and Wherein the cutter and the shank are selectively coupled via threaded engagement of the male threaded portion and the female threaded portion.
16. The rotary cutting tool of claim 15 Wherein the first taper angle is less than the second taper angle.
17. The rotary cutting tool of claim 15 Wherein the first pitch is equal to the second pitch. 12
18. The rotary cutting tool of clairn 15 Wherein the first pitch is less than the second pitch. 13
SE1450906A 2013-07-25 2014-07-21 Rotary tool including a coupling mechanism SE541240C2 (en)

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US13/950,407 US9643264B2 (en) 2013-07-25 2013-07-25 Coupling mechanism for cutting tool

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SE1450906A1 true SE1450906A1 (sv) 2015-01-26
SE541240C2 SE541240C2 (en) 2019-05-14

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JP (2) JP2015024491A (sv)
KR (1) KR102202451B1 (sv)
CN (1) CN104338993A (sv)
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CN104338993A (zh) 2015-02-11
KR20150013054A (ko) 2015-02-04
SE541240C2 (en) 2019-05-14
DE102014107745B4 (de) 2020-01-16
JP2015024491A (ja) 2015-02-05
US20150030398A1 (en) 2015-01-29
US9643264B2 (en) 2017-05-09
DE102014107745A1 (de) 2015-01-29
JP2019063994A (ja) 2019-04-25

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