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WO1996000635A1 - Procede de fabrication d'une fraise-mere - Google Patents

Procede de fabrication d'une fraise-mere Download PDF

Info

Publication number
WO1996000635A1
WO1996000635A1 PCT/NL1995/000224 NL9500224W WO9600635A1 WO 1996000635 A1 WO1996000635 A1 WO 1996000635A1 NL 9500224 W NL9500224 W NL 9500224W WO 9600635 A1 WO9600635 A1 WO 9600635A1
Authority
WO
WIPO (PCT)
Prior art keywords
face
profile
hob
rotation
grinding
Prior art date
Application number
PCT/NL1995/000224
Other languages
English (en)
Inventor
Augustinus Franciscus Herman Basstein
Gustaaf Adolf Uittenbogaart
Original Assignee
Crown Gear B.V.
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 Crown Gear B.V. filed Critical Crown Gear B.V.
Priority to EP95922004A priority Critical patent/EP0760728A1/fr
Priority to JP8503034A priority patent/JPH10502301A/ja
Publication of WO1996000635A1 publication Critical patent/WO1996000635A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/02—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters
    • B24B3/12—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters of hobs

Definitions

  • the invention relates to a method for producing a hob for machining a face gear, said hob being regrindable through grinding of the cutting faces, and said hob comprising a disc-shaped element having an axis of rotation and on the outer periphery a number of cutter tooth rows which are evenly distributed over the periphery, and which are each bounded by a cutting face at the front side and by a clearance face at the outside, the clearance faces near the cutting faces forming a profile which consists of one or more teeth and extends essentially helically over the outer periphery of the disc-shaped element, each cross- section of the helical profile being derived from an imaginary gear of infinitesimal thickness, the centre point (profile centre) of which lies in a centre plane situated at right angles to the axis of rotation of the tool, and the helical profile having a lead which is such that on a complete revolution of the disc-shaped element about the axis of rotation the imaginary gear rotates about the profile centre over one or more tooth pitches, and for
  • the object of the invention is to provide a method by means of which hobs for machining face gears can be produced more quickly and therefore more cheaply, and in which the clearance face is machined in such a way that the profile which is obtained after grinding of the cutting face, and with which the face gears are machined, deviates little if at all from the theoretically correct profile.
  • the clearance face in this case is machined with a profile grinding disc which is in contact with the full tooth height of a cutter tooth during the machining, with the result that all tooth flanks facing the same side have the same profile at right angles to the clearance face.
  • the machined clearance faces of the cutter tooth are machined in one go over the full height of the tooth, with the result that considerable machining time and cost saving is achieved. This saving can amount to a reduction in the machining time to less than 0.1 of the time required in the case of the known process.
  • the saving in machining time can be at the cost of inadmissible deviations from the theoretically correct tool shape.
  • This correct tool shape is determined, inter alia, by the profile of the cutting edge obtained after the grinding of the cutting face. It is possible for the deviations occurring to be too great to allow the produc ⁇ tion of a face gear which meets the required quality standards.
  • Another object of the invention is to avoid these deviations.
  • the invention also relates to a hob for machining a face gear which can mesh with a cylindrical pinion, said hob being provided, inter alia, with a number of cutter tooth rows, each of which is bounded by a cutting face and a clearance face, the clearance face being provided with a helical profile, and is characterized in that each side of the clearance face is machined in such a way that each cross-section at right angles to the helical profile is identical.
  • Figure 1 shows a hob according to the prior art, in side view.
  • Figure 2 shows the outer periphery of the hob of Figure 1.
  • Figure 3 shows the hob along section III-III of Figure 1.
  • Figure 4 shows the machining of the clearance face of the hob with a profiled grinding disc.
  • Figure 5 shows section V-V of Figure 4.
  • Figure 6 shows a diagrammatic view of Figure 4.
  • Figure 7 shows the movements of the hob and the grinding disc relative to each other.
  • FIGS 1, 2 and 3 show a hob 1 with which a face gear 7 can be machined.
  • the hob 1 is provided with a number of cutter tooth rows 8, each of which has a cutting face 3 and a clearance face 2.
  • the hob 1 rotates about an axis of rotation 4 and moves along the face gear 7 during the machining.
  • the shape of a cutting edge 10 of a cutter tooth 9 is derived from a pinion 6, the shape and number of teeth of which correspond to a working pinion which meshes with the face gear to be machined by the hob 1.
  • the pinion 6 has a centre point 5, which lies in a centre plane 17 at right angles to the axis of rotation 4, a distance (b) from the centre point 5 to axis of rotation 4, starting at the cutting face 3, becoming smaller for each cutter tooth row 8 on rotation of the hob 1.
  • each cutter tooth 9 rotates through an angle ⁇ about the centre point 5, the angle ⁇ being equal to one or more times 360° divided by the number of teeth of the pinion 6.
  • This rotation produces a single-thread or multiple-thread hob in which the cutter teeth 9 are positioned, as it were, helically with a lead angle ⁇ over the outer periphery of the hob.
  • the cutting edges of the hob are very accurate.
  • the cutting faces 3 have to be distributed accurately over the periphery of hob 1. This is carried out on the grinders designed for the purpose, in a manner corresponding to that used for sharpening hobs used in the machining of cylindrical involute gears.
  • the cutting face 3 is usually designed as a face at right angles to the helix direction, which is somewhat helical. It is however also possible that the cutting face is a flat face.
  • the accuracy of the cutting edge 10 is also largely determined by the accuracy with which the clearance faces 2, which are complex in shape, are machined. Since the hob material is hardened, these faces are generally ground, and the grinding disc can be designed in the known manner as a profiled disc to which wear-resistant granules, for example of cubic boron nitride (CBN) or diamond, are applied. Also a ceramic grinding stone may be used, which is frequently sized by dressing.
  • CBN cubic boron nitride
  • diamond diamond
  • Figures 4 and 5 show the machining according to the invention of the clearance face 2 of the cutter tooth row 8.
  • the cutter tooth row 8 shown is a part of the hob 1, which corresponds to the hob shown in Figures 1 - 3 and comprises a large number of such cutter tooth rows, for example 9 to for example 30, two adjoining cutter tooth rows 8 being separated by the gash 11.
  • the hob 1 has an outer periphery 15 and a radius (r) lying in a plane at right angles to an axis of rotation 16 corresponding to axis of rotation 4 in Figure 1.
  • the cutting edges 10 of the hob 1 have a profile which is derived from the pinion 6, and which can mesh with the face gears made with the hob. These cutting edges 10 arise as an intersecting line between the cutting face 3 and the clearance face 2, the clearance face 2 and the cutting face 3 acquiring their shape through, for example, grinding.
  • the distance from the clearance face 2 to the axis of rotation 16 of the hob 1 decreases as the distance from the cutting face 3 increases. This ensures that after the face gear has been in contact with the cutting edge 10 of the hob the clearance face 2 does not come into contact again with the face gear to be machined.
  • the decrease in this distance can be achieved in various ways, but there is always an angle ⁇ between clearance face 2 and the outer diameter 15 which has the same value over the full width of the cutting face 3, while the angle ⁇ can vary over the length of the cutter tooth row 8.
  • this angle ⁇ is also constant over the length of the cutter tooth row 8, with the result that the clearance face 2 becomes spiral at right angles to the axis of rotation 16.
  • the angle ⁇ must be sufficiently large to allow sufficient clearance between the clearance face 2 and the face gears to be produced over the full tooth length of the face gear, and thus at all pressure angles of the face gear.
  • the determining factor here is the smallest pressure angle of the face gear made with the hob. If the smallest pressure angle is, for example, 10 degrees, a clearance angle ⁇ of more than 12 degrees is needed in order to achieve sufficient clearance between workpiece and tool.
  • the cutter tooth row 8 is machined in a plane 18 by a grinding disc 12, which is provided with wear-resistant granules at the position of a machining profile 13.
  • the grinding disc 12 has an axis of rotation 20 (not shown in Figure 4) , on which a centre point 21 lies in the plane through the centre of the machining profile 13.
  • the angle ⁇ is provided in the clearance face 2 by moving the centre point 21 of the grinding disc 12 towards the axis of rotation 16 in a direction B on rotation of the hob about its axis of rotation 16 in a direction A. At constant speed of rotation of the hob 1 this movement in direction B must be equally large for all teeth 9 in one machining plane 18, so that the angle ⁇ always has one value in one machining plane 18 over the width of the hob.
  • machining plane 18 lies the centre point 5 of the section of the helical profile, and at right angles to said machining plane 18 there is an axis of rotation 22 through the centre point 5. While the hob 1 rotating about axis of rotation 16 is being machined with grinding disc 12, the grinding disc 12 moves in the direction B towards the axis of rotation 16, while the grinding disc 12 rotates simultaneously about the axis of rotation 22, with the result that the teeth 9 are machined in the helix direction.
  • the centre point 21 of the grinding profile 13 of the grinding disc 12 lies at a distance (a) from the machining plane 18. This distance (a) varies during the rotation of the grinding disc 12 about the axis of rotation 22.
  • Figure 5 shows the machining of the clearance face 2 by the grinding disc 12 in section V-V of Figure 4. It can be seen here that in the section shown, which generally corresponds to the section of the cutting face 3, the cutter tooth row 8 has a shape which corresponds to the shape of the pinion 6 shown in Figure 3, which can mesh with the face gear produced by the hob. The centre point 5 and the teeth 9 of the pinion are visible, and the shape of the outer periphery 15 of the hob 1 corresponds to that of the pinion 6.
  • the grinding disc 12 is shown in two machining positions, namely during machining of the tooth 9 placed in the centre plane 17 and during machining of the tooth placed most towards the side (in practice this tooth will generally not be machined, since this tooth usually does not mesh with a face gear to be machined) .
  • section V-V is examined at various points on one cutter tooth row 8 and on various cutter tooth rows, the teeth 9 rotate about the centre point 5, and the centre point 5 moves away from and towards the axis of rotation 16 of the hob at successive positions of the section.
  • the teeth 9 acquire a lead with a lead angle 7, and through movement towards the axis of rotation 16, the clearance angle ⁇ is obtained.
  • the grinding disc 12 moves in such a way that the contact face between grinding disc and hob moves away from and towards the axis of rotation 16 and rotates about the centre point 5 which is moving away from and towards the axis of rotation 16 of the hob.
  • the grinding disc 12 is positioned approximately in the centre plane 17
  • the grinding disc 12 is positioned approximately in the direction of the lead angle ⁇ of the teeth 9 of the hob and moves in such a way that the axis of rotation 20 of the grinding disc 12 lies in a normal plane 19, which normal plane 19 lies at right angles to the clearance face 2 at the position of the machining plane 18.
  • the axis of rotation 20 of the grinding disc 12 then forms approximately an angle ⁇ with the machining plane 18.
  • a minimum pressure angle a ⁇ of a face gear to be produced gives a contact line 23 for the contact between hob and face gear
  • a maximum pressure angle ⁇ ,, ⁇ of a face gear to be produced gives a contact line 24 for the contact between hob and face gear.
  • the broken line indicates a maximum height 25 of the teeth of the face gears to be produced.
  • the hatching indicates an active working area 26 of the left flanks of the hob.
  • the double line indicates an active part 27 of the left flank, while the thin line indicates a non-active part 28.
  • Figure 7 shows the section of the hob, with the various movements which the grinding disc 12 rotating about the axis of rotation 20 makes during the machining of the clearance faces 2, while the hob rotates about its axis of rotation 16.
  • the grinding disc 12 makes an intermittent movement B towards the axis of rotation 16 of the hob 1, and during the transfer to the next cutter tooth row, passing through the gash 11, the grinding disc 12 always moves back to its starting point in a direction opposite to B.
  • the grinding disc rotates 12 in the direction of arrow C about the centre point 5 of the pinion at the position of the machining plane 18, with the result that the lead angle 7 is produced in the outer periphery.
  • the grinding disc 12 must also be placed in this angle 7 through rotation about an axis 31 which lies in the machining plane 18 and is parallel to the centre - 10 - plane 17.
  • a further correction must be made in a direction D.
  • Other corrections in the position of the grinding disc can also be made if necessary.
  • a further correction of the active flank 1 can also take place by making the grinding disc 12 to carry out a small oscillating movement, for example about the centre of the active flank 27.
  • the feed movement of the grinding is slow and the amplitude of the oscillation is very small, so that the quality and the speed of the grinding process is hardly influenced.
  • the shape of the machining profile 13 is adapted to this oscillation.
  • the size of the oscillating movement and the position of the oscillation point is the same for all grinding positions. They can however also vary.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear Processing (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

Procédé de fabrication d'une fraise-mère pour l'usinage d'une roue de champ. Ladite fraise-mère peut être meulée une nouvelle fois par meulage des faces de coupe (3), et comporte un certain nombre de rangées de dents coupantes (8) réparties de manière homogène autour de la périphérie et limitées chacune du côté antérieur par une face de coupe (3) et du côté extérieur par une face en dépouille (2), les faces en dépouille (2) proches des faces de coupe (3) formant un profil composé d'une ou plusieurs dents (9), et chaque section transversale du profil étant dérivée d'un pignon imaginaire apte à entrer en prise avec la roue de champ et doté d'un point central (centre de profil) (5). Selon le procédé, on usine la face en dépouille (2) de chaque rangée de dents coupantes (8) au moyen d'un disque abrasif profilé rotatif (12) qui se rapproche ou s'éloigne de l'axe de rotation pendant que la fraise-mère tourne autour de l'axe de rotation (16) au cours de l'usinage de la face en dépouille (3), et qui tourne simultanément autour d'un axe de rotation (22) traversant le centre de profil (5).
PCT/NL1995/000224 1994-06-29 1995-06-26 Procede de fabrication d'une fraise-mere WO1996000635A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP95922004A EP0760728A1 (fr) 1994-06-29 1995-06-26 Procede de fabrication d'une fraise-mere
JP8503034A JPH10502301A (ja) 1994-06-29 1995-06-26 ホブの製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9401089A NL9401089A (nl) 1994-06-29 1994-06-29 Werkwijze voor het vervaardigen van een afwikkelfrees.
NL9401089 1994-06-29

Publications (1)

Publication Number Publication Date
WO1996000635A1 true WO1996000635A1 (fr) 1996-01-11

Family

ID=19864386

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1995/000224 WO1996000635A1 (fr) 1994-06-29 1995-06-26 Procede de fabrication d'une fraise-mere

Country Status (4)

Country Link
EP (1) EP0760728A1 (fr)
JP (1) JPH10502301A (fr)
NL (1) NL9401089A (fr)
WO (1) WO1996000635A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100420664B1 (ko) * 2001-01-09 2004-03-02 한국생명공학연구원 배초향에서 분리한 아폽토시스 저해 효과를 나타내는신규한 화합물, 그의 제조방법, 그를 포함하는 약학적조성물 및 용도
DE10113301B4 (de) * 2001-03-19 2008-05-21 Erwin Junker Maschinenfabrik Gmbh Verfahren und Vorrichtung zum Hinterschleifen der Schneidzähne von zylindrisch oder kegelig geformten Abwalzfräsern sowie Abwalzfräser
US9120167B2 (en) 2011-07-12 2015-09-01 Mitsubishi Heavy Industries, Ltd. Method for manufacturing screw-shaped tool
EP3626376A1 (fr) * 2018-09-24 2020-03-25 ETA SA Manufacture Horlogère Suisse Fraise-mere pour la fabrication de roues dentees horlogeres

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014013230A1 (de) * 2014-09-05 2016-03-10 Gleason-Pfauter Maschinenfabrik Gmbh Verfahren zum Bearbeiten einer Verzahnung, Bearbeitungswerkzeug und Werkzeugmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB222937A (en) * 1923-07-07 1924-10-07 Alfred Herbert Improvements in the grinding of hobs of worm form
US1778541A (en) * 1927-05-20 1930-10-14 Wildhaber Ernest Method of grinding relief on tools
US5033239A (en) * 1990-06-14 1991-07-23 Pfauter-Maag Cutting Tools Limited Partnership Disposable hob and method of grinding the same
WO1992009395A1 (fr) * 1990-11-29 1992-06-11 Crown Gear B.V. Outil pour la production de couronnes dentees et procede de production dudit outil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB222937A (en) * 1923-07-07 1924-10-07 Alfred Herbert Improvements in the grinding of hobs of worm form
US1778541A (en) * 1927-05-20 1930-10-14 Wildhaber Ernest Method of grinding relief on tools
US5033239A (en) * 1990-06-14 1991-07-23 Pfauter-Maag Cutting Tools Limited Partnership Disposable hob and method of grinding the same
WO1992009395A1 (fr) * 1990-11-29 1992-06-11 Crown Gear B.V. Outil pour la production de couronnes dentees et procede de production dudit outil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
S.V. KOLESNIKOV & AL.: "Grinding hobbing cutters on the 3v663vf3 model semiautomatic hob-sharpener", RUSSIAN ENGINEERING RESEARCH, vol. 12, no. 8, NEW YORK, US, pages 58 - 61, XP000382430 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100420664B1 (ko) * 2001-01-09 2004-03-02 한국생명공학연구원 배초향에서 분리한 아폽토시스 저해 효과를 나타내는신규한 화합물, 그의 제조방법, 그를 포함하는 약학적조성물 및 용도
DE10113301B4 (de) * 2001-03-19 2008-05-21 Erwin Junker Maschinenfabrik Gmbh Verfahren und Vorrichtung zum Hinterschleifen der Schneidzähne von zylindrisch oder kegelig geformten Abwalzfräsern sowie Abwalzfräser
US9120167B2 (en) 2011-07-12 2015-09-01 Mitsubishi Heavy Industries, Ltd. Method for manufacturing screw-shaped tool
EP3626376A1 (fr) * 2018-09-24 2020-03-25 ETA SA Manufacture Horlogère Suisse Fraise-mere pour la fabrication de roues dentees horlogeres

Also Published As

Publication number Publication date
NL9401089A (nl) 1996-02-01
EP0760728A1 (fr) 1997-03-12
JPH10502301A (ja) 1998-03-03

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