WO2020212903A1 - Outil permettant de chanfreiner une roue dentée brute et procédé de chanfreinage associé - Google Patents

Outil permettant de chanfreiner une roue dentée brute et procédé de chanfreinage associé Download PDF

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Publication number
WO2020212903A1
WO2020212903A1 PCT/IB2020/053609 IB2020053609W WO2020212903A1 WO 2020212903 A1 WO2020212903 A1 WO 2020212903A1 IB 2020053609 W IB2020053609 W IB 2020053609W WO 2020212903 A1 WO2020212903 A1 WO 2020212903A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool
gear wheel
cutting
chamfer
raw gear
Prior art date
Application number
PCT/IB2020/053609
Other languages
English (en)
Inventor
Carlo IURISCI
Original Assignee
Samputensili Cutting Tools S.R.L.
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 Samputensili Cutting Tools S.R.L. filed Critical Samputensili Cutting Tools S.R.L.
Publication of WO2020212903A1 publication Critical patent/WO2020212903A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F19/00—Finishing gear teeth by other tools than those used for manufacturing gear teeth
    • B23F19/10—Chamfering the end edges of gear teeth
    • B23F19/102—Chamfering the end edges of gear teeth by milling
    • B23F19/104—Chamfering the end edges of gear teeth by milling the tool being a hob
    • 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
    • B23C5/08—Disc-type cutters
    • 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
    • B23C5/12—Cutters specially designed for producing particular profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F21/00—Tools specially adapted for use in machines for manufacturing gear teeth
    • B23F21/12—Milling tools
    • B23F21/16—Hobs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F5/00—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made
    • B23F5/12—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by planing or slotting
    • B23F5/16—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by planing or slotting the tool having a shape similar to that of a spur wheel or part thereof
    • B23F5/163—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by planing or slotting the tool having a shape similar to that of a spur wheel or part thereof the tool and workpiece being in crossed axis arrangement, e.g. skiving, i.e. "Waelzschaelen"

Definitions

  • the present invention relates to a tool to chamfer a raw gear wheel and a relative chamfering method.
  • the chamfering is performed downstream of the roughing operation, in which the raw gear wheel is made with the help of a hob. Therefore, the chamfer removes the sharp edges of each tooth so as to prevent the raw gear wheel from being damaged or damaging another gear wheel with which it meshes during use. Furthermore, by removing the sharp edges, it is possible to avoid injuring the operator during the handling, for example the assembly, of the gear wheel.
  • the chamfering tool generally comprises a plurality of tooth shaped cutting elements, in which the cutting profiles are made on the external lateral sides thereof.
  • the cutting elements have a shape which is substantially complementary to the shape of the space comprised between the two teeth of the raw gear wheel.
  • both the tool and the raw gear wheel are set in rotation.
  • the tool is configured to rotate around an axis skewed relative to the axis of the raw gear wheel.
  • each cutting element passes through a respective compartment of the raw gear wheel and chamfers, by means of the cutting profiles on the external lateral sides, two sides, facing one another, of two adjacent teeth, which laterally delimit a respective compartment of the raw gear wheel.
  • a chamfering tool of a known type simultaneously chamfers the left side of the previous tooth and the right side of the following tooth which are held, during mutual rotation, by the chamfering tool.
  • the known chamfering tools substantially work by plastic deformation of the sides of two adjacent teeth, creating a track in the material, which compromises the finishing operations following the finishing step.
  • the object of the present invention is, therefore, to provide a tool to chamfer a raw gear wheel and relative chamfering method which are free from the drawbacks of the state of the art and which are easy and inexpensive to manufacture.
  • a tool is provided to chamfer a raw gear wheel according to what is claimed in the attached claims .
  • FIG. 1 is a schematic and perspective view of a chamfering tool according to the present invention in an operating configuration
  • Figure 2 illustrates a detail of Figure 1 in a first processing stage
  • FIG. 3 is similar to Figure 2 and illustrates the same detail in a second processing stage
  • FIG. 4 is a schematic view, with some parts removed for clarity, of a tool according to the present invention during use.
  • the number 1 generally denotes a tool to chamfer a raw gear wheel 6.
  • the raw gear wheel 6 is a cylindrical element having a rotation axis Y and a thickness s.
  • the raw gear wheel 6 is axially delimited by two surfaces substantially perpendicular to said axis Y and hereinafter referred to as the front surface 3A and the front surface 3B, respectively.
  • the front surfaces 3A and 3B are opposite to one another.
  • the raw gear wheel 6 comprises a plurality of teeth 5 which project radially outside the raw gear wheel 6.
  • the teeth 5 are equidistant.
  • Each tooth 5 has a right side 4* and a left side 4**.
  • the sides 4* and ** extend along the thickness s of the tooth 5.
  • the term side 4* or 4** refers to the entire side surface of the tooth 5, that is the side surface which extends between the head circumference dt and the foot circumference dp of the raw gear wheel 6.
  • the head circumference dt is, in a known way, the circumference that externally delimits the tooth 5
  • the foot circumference dp is, in a known way, the internal circumference that internally delimits the tooth 5.
  • the terms internal and external are used with reference to the rotation axis Y of the raw gear wheel 6.
  • the raw gear wheel 6 has an edge 2A between the front surface 3A and the sides 4* and 4**.
  • the raw gear wheel 6 has an edge 2B between the front surface 3B and the sides 4* and 4**.
  • the chamfering tool 1 is configured to chamfer each edge 2A, 2B.
  • the tool 1 is configured to remove material along each edge 2A, 2B so as to create a chamfer 20A and 20B, respectively ( Figure 3) .
  • the chamfer 20A can be continuous, i.e. the entire edge 2A is chamfered, or intermittent, i.e. some portions of edge 2A are not removed.
  • the tool 1 comprises a cylindrical body 7 having a rotation X axis and a substantially cylindrical side surface 8.
  • the tool 1 comprises a plurality of cutting elements 9 each radially projecting from the side surface 8.
  • Each cutting element 9 has a right cutting profile 10 and a left cutting profile 11, which laterally delimit a groove 12.
  • the terms right and left are used with reference to the rotation direction of the tool 1.
  • the groove 12 is configured to house, in use, a respective tooth 5 of the raw gear wheel 6.
  • the right profile 10 is configured to chamfer, in use, the left side 4** of a respective tooth 5.
  • the left profile 11 is configured to chamfer, in use, the side right 4* of a respective tooth 5.
  • each cutting element 9 simultaneously chamfers both the sides 4* and 4** of the respective tooth 5.
  • the right profile 10 and the left profile 11 are different from one another.
  • the profiles 10 and 11 do not have the same shape. Therefore, the cutting element 9 is not made symmetrical along a plane transverse or perpendicular to the rotation axis X.
  • the profiles 10 and 11 can be arranged in a mirror like manner to one another.
  • the groove 12 has a profile designed, in particular calculated, to cut a profile with the shape of an involute of a circle.
  • the profiles 10 and 11 that laterally delimit the groove 12 are profiles made to cut the profile into an involute of a circle of the tooth 5.
  • each cutting element 9 helically projects around the side surface 8.
  • each cutting element 9 is arranged along an imaginary helix which extends around the side surface 8 of the cylindrical body 7, so as to allow, in a known manner, the meshing between the tool 1 and the raw gear wheel 6 during use.
  • the chamfering tool 1 has a plurality of cutting elements 9 which radially project from the same axial portion pa of the tool 1 itself. In this case, it is stated that the tool 1 has a plurality of threads/starts .
  • each cutting element 9 of an axial portion pa lies on a respective start.
  • the rotation axis X and the rotation axis Y are arranged substantially skewed relative to one another and set the tool 1 in rotation around the rotation axis X and the raw gear wheel 6 in rotation around the rotation axis Y, respectively.
  • the tool 1 is moved close to the raw gear wheel 6.
  • the tool 1 is synchronized with the raw gear wheel 6 so as to mesh with one another without impact.
  • the tool 1 and the raw gear wheel 6 are synchronized with one another, so that a tooth 5 of the raw gear wheel 6 is made to slide through a groove 12 of a respective cutting element 9.
  • the chamfering of the edge 2A can take place by means of one or more runs, i.e. several runs of a tooth 5 by means of the respective groove 12. In the case of performing several runs, between one run and the following run, there is the further step of radially feeding the tool 1 towards the raw gear wheel 6.
  • the geometry 20A, 20B of the final chamfer depends both on the shape of the profiles 10 and 11 of each cutting element 9 and on the reciprocal displacements between tool 1 and raw gear wheel 6 during machining.
  • Figures 5 to 8 illustrate examples of different types of chamfers 20 that can be made with the tool 1 and the method according to the present invention.
  • the chamfering of the other edge 2B can be carried out, i.e. of the edge 2B between the front surface 3B and the sides 4* and 4**.
  • the assembly direction of the tool 1 itself must be inverted, by disassembling it and reassembling it with the opposite direction to the previous one, so as to ensure that the right profile 10 and the left profile 11 face the edge 2B to be cut.
  • the tool 1 is moved axially along the axis X, so as to set each cutting element 9 gripping the respective edge 2B.
  • the rotation direction of the tool 1 is inverted, so as to also chamfer the edge 2B between the front surface 3B, opposite to the front surface 3A, and the side 4* and the side 4** of the respective tooth 5 of the raw gear wheel 6.
  • Ihe tool 1 and the method described hitherto have a plurality of advantages .
  • chamfering a cutting process is performed with the tool 1.
  • the chamfering thus created has a better precision, a higher quality and avoids the tracking of the material, with consequent plastic deformation.
  • the groove 12 of the cutting elements 6 is substantially complementary to the shape of the tooth 5 of the raw gear wheel 6. Therefore, it is ensured that the entire edge 2A or 2B of the tooth 5 is chamfered.
  • the tool 1 it is possible to obtain a plurality of different types of chamfers 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Gear Processing (AREA)

Abstract

La présente invention concerne un outil (1) permettant de chanfreiner un bord (2A, 2B) s'étendant entre une surface avant (3A, 3B) et des côtés (4*, 4**) de dents (5) d'une roue dentée brute (6) et comprenant : un corps cylindrique (7) ayant un axe de rotation (X) et une surface latérale sensiblement cylindrique (8); l'outil (1) étant doté d'une pluralité d'éléments de coupe (9) dont chacun fait saillie radialement à partir de ladite surface latérale (8); chaque élément de coupe (9) ayant un premier profil de coupe (10) et un second profil de coupe (11) qui délimitent latéralement une rainure (12) conçue pour abriter, lors de l'utilisation, une dent respective (5) de la roue dentée brute (6); le premier profil de coupe (10) et le second profil de coupe (11) étant conçus pour chanfreiner au moins une partie du bord (2A, 2B) entre la surface avant (3A, 3B) et un premier côté (4*) et un second côté (4**) d'une dent respective (5), respectivement.
PCT/IB2020/053609 2019-04-16 2020-04-16 Outil permettant de chanfreiner une roue dentée brute et procédé de chanfreinage associé WO2020212903A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000005886A IT201900005886A1 (it) 2019-04-16 2019-04-16 Utensile per la smussatura di una ruota dentata grezza e relativo metodo di smussatura
IT102019000005886 2019-04-16

Publications (1)

Publication Number Publication Date
WO2020212903A1 true WO2020212903A1 (fr) 2020-10-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2020/053609 WO2020212903A1 (fr) 2019-04-16 2020-04-16 Outil permettant de chanfreiner une roue dentée brute et procédé de chanfreinage associé

Country Status (2)

Country Link
IT (1) IT201900005886A1 (fr)
WO (1) WO2020212903A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58143916A (ja) * 1982-02-18 1983-08-26 Nachi Fujikoshi Corp 歯車歯切工具
US20060133901A1 (en) * 2004-12-20 2006-06-22 Gleason Cutting Tools Corporation Cutting tool for gears and other toothed articles
US7103973B2 (en) * 2003-07-05 2006-09-12 Fette Gmbh Method, device, and tool for chamfering the front-end edges of the inter-teeth grooves of a gear
CN201172134Y (zh) * 2008-05-13 2008-12-31 南京金鑫传动设备有限公司 圆头留磨滚刀及圆头留磨自倒角滚刀
US20160193648A1 (en) * 2013-09-16 2016-07-07 Felsomat Gmbh & Co. Kg Method for chamfering and polishing toothed workpieces
US20170173713A1 (en) * 2014-09-10 2017-06-22 Felsomat Gmbh & Co. Kg Method for skiving machining of a workpiece for production of a chamfer
DE102016015528A1 (de) * 2016-12-24 2018-06-28 EMAG GmbH & Co. KG Vorrichtung zum Anfasen verzahnter Werkstücke

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58143916A (ja) * 1982-02-18 1983-08-26 Nachi Fujikoshi Corp 歯車歯切工具
US7103973B2 (en) * 2003-07-05 2006-09-12 Fette Gmbh Method, device, and tool for chamfering the front-end edges of the inter-teeth grooves of a gear
US20060133901A1 (en) * 2004-12-20 2006-06-22 Gleason Cutting Tools Corporation Cutting tool for gears and other toothed articles
CN201172134Y (zh) * 2008-05-13 2008-12-31 南京金鑫传动设备有限公司 圆头留磨滚刀及圆头留磨自倒角滚刀
US20160193648A1 (en) * 2013-09-16 2016-07-07 Felsomat Gmbh & Co. Kg Method for chamfering and polishing toothed workpieces
US20170173713A1 (en) * 2014-09-10 2017-06-22 Felsomat Gmbh & Co. Kg Method for skiving machining of a workpiece for production of a chamfer
DE102016015528A1 (de) * 2016-12-24 2018-06-28 EMAG GmbH & Co. KG Vorrichtung zum Anfasen verzahnter Werkstücke

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