EP0704280A1 - Werkzeugmaschine, besonders zum Feinschleifen von Nockenwellen - Google Patents

Werkzeugmaschine, besonders zum Feinschleifen von Nockenwellen Download PDF

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Publication number
EP0704280A1
EP0704280A1 EP95402170A EP95402170A EP0704280A1 EP 0704280 A1 EP0704280 A1 EP 0704280A1 EP 95402170 A EP95402170 A EP 95402170A EP 95402170 A EP95402170 A EP 95402170A EP 0704280 A1 EP0704280 A1 EP 0704280A1
Authority
EP
European Patent Office
Prior art keywords
machining
camshaft
tools
speed
machine according
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP95402170A
Other languages
English (en)
French (fr)
Inventor
Didier Bertrand
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Abramatic SA
Original Assignee
Abramatic SA
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 Abramatic SA filed Critical Abramatic SA
Publication of EP0704280A1 publication Critical patent/EP0704280A1/de
Withdrawn legal-status Critical Current

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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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
    • B24B19/12—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts
    • 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
    • B24B35/00—Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency

Definitions

  • the present invention relates to a machining machine, in particular microfinishing, for camshafts.
  • the cams on a shaft are mostly machined one by one due to their offset angular positions on the shaft.
  • the machining of the camshafts can therefore be carried out, for example by the action of an abrasive belt or any other machining or microfinishing tool, successively on each cam of the animated shaft rotating at constant speed, which is equivalent to machining the camshaft in several passes.
  • DE-A-1.103.091 also discloses a device for machining a camshaft which makes it possible to work the different cams to be machined on the same shaft at the same time.
  • the machining tools are arranged in a star around the camshaft to be machined and are distributed along the camshaft as a function of the location of the respective cam to be machined on said shaft.
  • the machining tools and the camshaft are rotated during machining.
  • This star arrangement makes it possible to distribute around the camshaft the radial forces applied at the same time by the machining tools, said forces being thus compensated.
  • the invention provides a machine for machining, in particular microfinishing, camshafts, of the type comprising a machining tool for each cam of the camshaft, said tools for machining being angularly offset around the camshaft and radially movable, characterized in that two machining tools, assigned to two adjacent cams, are rotated at the same constant speed, the angular offset between the two tools machining around the axis of the camshaft being at the same relative angle as between their respective cams so that, at a given instant, all the machining tools are at the same point of their respective cams and in that the camshaft is rotated at variable speed so that the speed of rotation of the camshaft varies as a function of the position of the machining tools on their respective cams.
  • the variation of the speed of the camshaft allows, at a given point and at a given time, adequate machining of each cam by its respective machining tool. These tools are all at the same point of their respective cams thanks to the angular offset of the machining tools and, due to the speed variation of the camshaft, the relative speed along the profile of the cam remains constant all machining time.
  • the machine is double stations to facilitate the replacement of tools. In fact, accessibility is then easier, the replacement of the strips being easier in distribution 4 to 4, for example, on each side of the machining station.
  • This machine can be made vertically or horizontally.
  • the machine according to the invention is preferably automatically loaded by a manipulator or by a loading robot which charges and which discharges.
  • This machining machine will be designed so as to be preferably heavy and stable.
  • the gripping of the workpiece is advantageously between-center with a spindle indexing for orientation, loading and unloading.
  • this machine can be, in particular, a superfinishing / microfinishing machine with which it is possible to produce crossed lines and a constant undulation on all the cams at the same time.
  • the machining tools are distributed around the different cams to be machined so as to be angularly offset around the camshaft as a function of the angular offset between the cams so that at at a given moment, all the machining tools are at the same point of their respective cams and the variation of rotation speed of the camshaft is carried out by a single control as well as the relative speeds along the profile of all cams are identical and constant.
  • camshaft machining station which includes both a machining machine for machining the camshaft and a superfinishing / microfinishing machine.
  • a linear transfer is advantageously carried out between the two machines, preferably horizontal while a vertical loader is located in front of each machine.
  • FIG. 1 schematically represents an end view of a machining machine according to an exemplary embodiment of the invention.
  • the machining station has four machining tools.
  • Each machining tool 2 for example an abrasive belt, is rotated by a drive shaft 1, the abrasive belt 2, 2 ′ being stretched between the shaft 1 and a contact roller 3 by means of tension rollers 5. Provision may be made for the shaft 1 to simultaneously drive two bands 2, 2 '.
  • the contact roller is plunged preferably by digital control, trolley and ball screw fully protected against splashing of chips and abrasive, the evacuation of the chips being generally carried out by deep washing.
  • Machining tools 2, 2 ' intended to machine two adjacent cams on the shaft to be machined are angularly offset, around the camshaft to be machined, at the same relative angle as the respective cams.
  • the camshaft 4 to be machined is placed centrally between the machining tools and is rotated at variable speed.
  • the variation of the speed of the camshaft 4 is determined relative to the profile of a single cam.
  • the machining tools 2, 2 ' are angularly offset so as to come into contact on their respective cam to be machined all at the same point at a given time.
  • all the abrasive belts 2, 2 ′ of the machining station are all driven in rotation by the drive shafts 1 at the same constant speed, the drive shafts 1 being controlled by a single speed control.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP95402170A 1994-09-28 1995-09-27 Werkzeugmaschine, besonders zum Feinschleifen von Nockenwellen Withdrawn EP0704280A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9411578 1994-09-28
FR9411578A FR2724862B1 (fr) 1994-09-28 1994-09-28 Machine d'usinage, en particulier de microfinition, pour arbres a cames

Publications (1)

Publication Number Publication Date
EP0704280A1 true EP0704280A1 (de) 1996-04-03

Family

ID=9467362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402170A Withdrawn EP0704280A1 (de) 1994-09-28 1995-09-27 Werkzeugmaschine, besonders zum Feinschleifen von Nockenwellen

Country Status (2)

Country Link
EP (1) EP0704280A1 (de)
FR (1) FR2724862B1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1103091B (de) 1958-08-29 1961-03-23 Steinmueller Gmbh L & C Verdraengungskoerper, insbesondere fuer Schwerwasser-Waermetauscher
EP0434533A1 (de) * 1989-12-19 1991-06-26 Societe Des Procedes Machines Speciales Maschine zum Supfinieren von Wellen, insbesondere Nockenwellen
DE4103091A1 (de) * 1991-02-01 1992-08-06 Erwin Junker Verfahren und vorrichtung zum gleichzeitigen schleifen aller nocken einer nockenwelle in einer aufspannung
GB2271731A (en) * 1992-10-21 1994-04-27 Schaudt Maschinenbau Gmbh Grinding out-of-round workpieces
DE4239195A1 (de) * 1992-11-21 1994-05-26 Schaudt Maschinenbau Gmbh Verfahren und Maschine zum Schleifen von Nocken

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1103091B (de) 1958-08-29 1961-03-23 Steinmueller Gmbh L & C Verdraengungskoerper, insbesondere fuer Schwerwasser-Waermetauscher
EP0434533A1 (de) * 1989-12-19 1991-06-26 Societe Des Procedes Machines Speciales Maschine zum Supfinieren von Wellen, insbesondere Nockenwellen
DE4103091A1 (de) * 1991-02-01 1992-08-06 Erwin Junker Verfahren und vorrichtung zum gleichzeitigen schleifen aller nocken einer nockenwelle in einer aufspannung
GB2271731A (en) * 1992-10-21 1994-04-27 Schaudt Maschinenbau Gmbh Grinding out-of-round workpieces
DE4239195A1 (de) * 1992-11-21 1994-05-26 Schaudt Maschinenbau Gmbh Verfahren und Maschine zum Schleifen von Nocken

Also Published As

Publication number Publication date
FR2724862A1 (fr) 1996-03-29
FR2724862B1 (fr) 1996-12-27

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