EP1258316A2 - Dispositif d'affûtage de pièces - Google Patents

Dispositif d'affûtage de pièces Download PDF

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Publication number
EP1258316A2
EP1258316A2 EP02001223A EP02001223A EP1258316A2 EP 1258316 A2 EP1258316 A2 EP 1258316A2 EP 02001223 A EP02001223 A EP 02001223A EP 02001223 A EP02001223 A EP 02001223A EP 1258316 A2 EP1258316 A2 EP 1258316A2
Authority
EP
European Patent Office
Prior art keywords
objects
abrading
longitudinal axis
moving
active surface
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Withdrawn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
EP02001223A
Other languages
German (de)
English (en)
Other versions
EP1258316A3 (fr
Inventor
Massimo Trigari
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.)
Commersald SpA
Original Assignee
Commersald SpA
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 Commersald SpA filed Critical Commersald SpA
Publication of EP1258316A2 publication Critical patent/EP1258316A2/fr
Publication of EP1258316A3 publication Critical patent/EP1258316A3/fr
Withdrawn legal-status Critical Current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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/16—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding sharp-pointed workpieces, e.g. needles, pens, fish hooks, tweezers or record player styli
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically

Definitions

  • This invention concerns an apparatus for sharpening objects, in particular elongated bodies such as welding electrodes.
  • Apparatuses are known for sharpening electrodes, especially for sharpening tungsten electrodes, said apparatuses comprising an abrasive grinder provided with an area coated by electrically deposited synthetic diamond particles.
  • the grinder is fixed by a grubscrew to a shaft actuated by an electric motor, which shaft rotates said grinder.
  • the above mentioned apparatuses are also provided with adjusting devices for adjusting the tilt of the electrode in relation to the grinder surface, said devices enabling a preset sharpening angle to be obtained at the tip of the electrode.
  • Said devices also comprise a bored sliding bar, provided with a double series of holes of decreasing diameter inside which the electrodes that require sharpening can be positioned, and a roller which is rotated by a second electric motor and which is connected to the latter by an O-ring which also performs the function of rotating the electrode after it has been manually pressed against the roller.
  • an operator In order to conduct sharpening operations, an operator first determines the diameter of the electrode on the first series of holes in the sliding bar and then tilts the electrode-holding device to achieve the required sharpening angle, starts up the grinder, and "weighs down” the electrode by means of a metal cylinder.
  • the operator causes the cylinder to act on the end of the electrode that is further from the grinder so as to push said electrode up against the abrasive grinder, and the operator then inserts the electrode into the second series of holes that are located on the diamond-coated strip, and uses a knob connected to a threaded nut to push the roller against the latter to make it rotate.
  • the electrode then makes contact with the grinder and starts sharpening.
  • One drawback of prior-art sharpening apparatuses consists in that the diamond-coated grinder always abrades the electrode in the same position, which causes uneven and extremely severe wear to the diamond-coated zone although the width of said diamond-coated zone is significantly greater than the section that becomes progressively worn.
  • Another drawback of the prior-art sharpening apparatuses consists in that the tilting device that enables the sharpening angle to be adjusted causes the electrodes, in which a tip must be made having a sharpening angle that is very acute, or otherwise, a very open sharpening angle, to be significantly abraded under or over the grinder's halfway axis; the diamond-coated particles thus come into contact obliquely with the electrode in relation to the projection of the axis of the electrode on the grinder surface, thus leaving unsatisfactory roughness on the surface of the sharpened taper.
  • a further drawback of the prior-art sharpening apparatuses is that the O-ring which rotates the electrode wears down very quickly, as it must be pressed with sufficient force to overcome the friction which is generated between the electrode and the holes arranged on the sliding bar, in addition, the efficacy of this system depends on the operator's skill in identifying the optimal pressure with which the O-ring must be pressed against the electrode: too light pressure will not enable the electrode to rotate, too great pressure will have the opposite effect of prematurely wearing out the O-ring.
  • the metal cylinder used to "weigh down" the electrode has not been carefully chosen, and in particular if it is very heavy, it may make the grinder interact with the electrode too violently and thus cause very high consumption of abrasive material.
  • the cylinder is too light, sharpening time will be very long because the electrode will not be pressed against the grinder with sufficient force.
  • a further drawback of the prior-art sharpening apparatuses is that replacing the grinder is rather complicated, mainly because correct axial positioning of the grinder depends on the operator's skill.
  • An object of this invention is to improve the known apparatuses for sharpening objects, especially for sharpening welding electrodes.
  • Another object of this invention is to obtain a sharpening apparatus provided with an abrasive grinder that can be easily and rapidly assembled and disassembled.
  • a further object of this invention is to obtain a sharpening apparatus comprising an abrasive portion that does not have regions that are specially subject to wear, but which is subject to uniform wear.
  • a further object of this invention is to provide a sharpening apparatus that, at the end of sharpening operations, enables electrodes to be obtained the tips of which have extremely low surface roughness.
  • Another further object of this invention is to obtain a sharpening apparatus provided with transfer means which is suitable for automatically rotating the electrodes around the respective longitudinal axis and for axially moving said electrodes in such a manner as to drive them to interact with the abrasive grinder.
  • an apparatus for sharpening objects comprising abrading means arranged for abrading an end portion of said objects and for creating tip means in said objects, and support means connected to rotation driving means and arranged for supporting said abrading means, characterised in that said abrading means is fixed to said support means by magnetic coupling means.
  • the magnetic coupling means comprises magnetic pads housed in suitable seats arranged in the support means.
  • the abrading means comprises a crown of ferromagnetic material on which a layer of abrasive material such as diamond particles is deposited; the magnetic pads are thereby able to interact with the abrading means, keeping said abrading means fixed to the support means during operation of the apparatus.
  • an apparatus for sharpening objects can be obtained, in which assembly and/or replacement of the abrading means is extremely easy and economical.
  • an apparatus for sharpening objects comprising abrading means having an active surface arranged for abrading an end portion of said objects and for creating tip means in said objects, characterised in that it further comprises moving means for moving said objects, said moving means being arranged for driving said objects to interact with regions of said active surface.
  • the abrading means comprises an active surface shaped as a circular crown having a width, in a radial direction, which is significantly greater than the end of each object requiring abrasion.
  • the moving means comprises trolley means on which the object to be sharpened is fixed and further comprises an eccentric device arranged for actuating said trolley means with a straight reciprocating movement, so as to bring the end of the object into contact with said active surface at all points.
  • the moving means causes each object to oscillate in a direction which is perpendicular to the grinder axis and with an oscillation width which is as great as the width of the grinder's active surface.
  • an apparatus for sharpening objects can be obtained, in which the abrading means is subject to uniform and extremely limited wear.
  • an apparatus for sharpening objects, said apparatus comprising abrading means driven into rotation around a respective rotation axis and arranged for abrading an end portion of said objects to create tip means in said objects, characterised in that, during said sharpening, said objects interact with said abrading means so that a projection of the longitudinal axis of each object on a plane containing said active surface is tangent to a circumference the center of which lies on said rotation axis.
  • an apparatus can be obtained for sharpening objects, wherein the abrading means creates, at one end of each of the objects, a having an external surface provided with a plurality of microgrooves arranged at right angles to the axis of the object, thereby creating excellent surface roughness.
  • an apparatus for sharpening objects comprising abrading means arranged for abrading an end portion of said object to create tip means on said objects, characterised in that it further comprises transfer means arranged for rotating each of said objects around a respective longitudinal axis and for simultaneously moving each of said objects along said longitudinal axis, to drive each of said objects to interact with said abrading means.
  • the transfer means comprises first idle roller means, second idle roller means and driving roller means, which are arranged for gripping the objects to be sharpened and rotating them and moving them axially as described above, the driving roller means being tilted by a given angle in relation to the first idle roller means and to the second idle roller means, the axes of which are mutually parallel.
  • the driving roller means is fitted to slide means and can therefore be moved close to or far from the first idle roller means and the second idle roller means and are thus suitable for machining objects of any dimensions after they have been pressed up against said objects.
  • an apparatus for sharpening objects can be obtained, by means of which apparatus objects of any dimensions can be machined simply and effectively.
  • Such machining is completely automatic, the operator having to intervene only to position the objects on the apparatus and take them from the apparatus at the end of the machining cycle.
  • Figures 1 to 5 show an apparatus 1 for sharpening electrodes 2, comprising a body 3 to which a frame 4 is fixed, the frame 4 holding transfer means 5 arranged for moving the electrodes 2 according to a helicoidal motion.
  • Said helicoidal motion has a rotation component with respect to a longitudinal axis of said electrodes and a translation component in the direction of said axis.
  • the apparatus 1 further comprises abrading means 6 which is fixed to respective support means 7 and which is suitable for abrading an end portion of the electrodes to create on each of said electrodes a sharpened tip 2a.
  • the abrading means 6 comprises a crown 9 made of ferromagnetic material, on which an active surface 10 can be identified, said active surface 10 being created by depositing a layer of abrasive material, such as diamond powder.
  • the support means 7 is rotated around a respective axis X by actuating means 8, comprising an electric motor 11.
  • the support means 7 comprises a flange 12 fitted to the shaft 13 of the electric motor 11.
  • a flange 12 fitted to the shaft 13 of the electric motor 11.
  • several chambers 14 are housed, each one of which can accommodate a magnetic element 15 arranged for interacting with the crown 9 to fix it to the flange 12.
  • This operation is extremely simple, particularly because the crown 9 is fixed to the flange 14, which has an assembly reference on shaft 13, thereby enabling complicated axial operations to position the crown and the flange to be eliminated.
  • the electrodes 2 can be tilted in relation to the working plane of the abrading means 6 by rotating the frame 4 around a fulcrum F and subsequently locking said frame 4 in the required position by manually acting on the clamp blocking means 16 of a known type.
  • the angle formed by the electrodes 2 with respect to said working plane can be varied, going for example from an angle ⁇ , shown in Figure 1, to an angle ⁇ , shown in Figure 2; thus, it is possible to obtain electrodes 2 of which the tips 2a are basically shaped as cones with angles at the tops of a set degree.
  • the transfer means 5 comprises driving roller means 19 arranged for interacting with the electrodes 2 and for pressing them against first driven roller means 17 and second driven roller means 18.
  • the driving roller means 19 is actuated by a belt 23 stretched between said driving roller means 19 and a pulley 22 that is fixed to a shaft 21 of a further electric motor 20.
  • a first pair of O-rings 24 and a second pair of O-rings 26 are associated with the driving roller means 19, at axially consecutive sections, said O-rings rotating the electrodes 2 by friction.
  • a first bearing 26 and a second bearing 27, and a third bearing 28 and a fourth bearing 29 are associated respectively with the first driven roller means 17 and to the second driven roller means 18, the external races of said bearings acting as abutting elements for the electrodes 2 pressed on them by the driving roller means 19.
  • the driving roller means 19 has a longitudinal axis tilted by an angle ⁇ in relation to the axes of the first driven roller means 17 and of the second driven roller means 18, which are basically mutually parallel.
  • the driving roller means 19 When the driving roller means 19 is actuated by the further electric motor 20, the two pairs of O-rings 24 and 25, which are fixed to the driving roller means 19, transmit a rotary movement to the electrodes 2 around a longitudinal axis thereof.
  • the electrodes 2 are shifted sideways along said longitudinal axis, which drives the electrodes 2 to interact with the abrading means 6.
  • the driving roller means 19 and the actuating devices thereof, namely the further motor 20, the pulley 22 and the belt 23, are fitted to a slide 30, which is slidably coupled with the frame 4 and movable far from and close to the first driven roller means 17 and the second driven roller means 18: this makes the apparatus 1 suitable for machining electrodes 2 of any dimensions.
  • this makes the apparatus 1 suitable for machining electrodes 2 of any dimensions.
  • by adjusting the knob 31 and overcoming the resistance of the spring 32 it is possible to bring into contact with the bearings 26, 27, 28, 29, an electrode with a wide range of diameters and subsequently, after releasing said knob 31, it is possible to keep the electrode in position under the thrust of the two pairs of O-rings 24, 25.
  • the driving roller means 19 with the relative actuating devices, and the first driven roller means 17 and the second driven roller means 18 are fitted on trolley means 33.
  • the trolley means 33 is actuated with a reciprocating straight movement by means of an eccentric 34 rotating around a respective axis G: thus, the tip 2a of each of the electrodes 2 is driven to interact with the entire active surface 10 of the abrading means 6 and wear said abrading means 6 down in a uniform manner and to a limited extent.
  • the trolley means 33 pressed by the eccentric 34 and recalled by a further spring 35, oscillates with an oscillation amplitude which is substantially equal to the width of crown 9.
  • the transfer means 5 and the trolley means 33 described above are so arranged that the electrodes 2, during sharpening, interact with the abrading means 6, the electrodes 2 lying on a plane that passes through the rotation axis of the abrading means 6: thus the abrading means 6 achieve excellent abrading of the electrodes and give them tips 2a with extremely limited surface roughness.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
EP02001223A 2001-01-19 2002-01-17 Dispositif d'affûtage de pièces Withdrawn EP1258316A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001CA000001A ITCA20010001A1 (it) 2001-01-19 2001-01-19 Apparato per affilare oggetti
ITCA010001 2001-01-19

Publications (2)

Publication Number Publication Date
EP1258316A2 true EP1258316A2 (fr) 2002-11-20
EP1258316A3 EP1258316A3 (fr) 2004-01-07

Family

ID=11440977

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02001223A Withdrawn EP1258316A3 (fr) 2001-01-19 2002-01-17 Dispositif d'affûtage de pièces

Country Status (4)

Country Link
US (1) US20020137445A1 (fr)
EP (1) EP1258316A3 (fr)
CA (1) CA2368633A1 (fr)
IT (1) ITCA20010001A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITRM20050018A1 (it) * 2005-01-14 2006-07-15 Dima S N C Di Boccia M & C Macchina per l'affilatura di lame.
CN102107383A (zh) * 2010-11-30 2011-06-29 聚光科技(杭州)股份有限公司 一种电极表面处理方法及装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536992A (en) * 1983-11-04 1985-08-27 Magnetic Peripherals Precision lapping system
US4941245A (en) * 1988-04-28 1990-07-17 Yamaha Hatsudoki Kabushiki Kaisha Rotary file, support member and abrasive device
US5575708A (en) * 1995-06-07 1996-11-19 Alligiance Corporation Belt grinding machine and method for forming cutting edges on surgical instruments
FR2747332A1 (fr) * 1996-04-12 1997-10-17 Emmanuel Maurin Dispositif pour l'affutage des electrodes de soudure
WO2000027588A1 (fr) * 1998-10-27 2000-05-18 Heine Plougman Olsen Appareil destine, en particulier, a la rectification d'electrodes pour soudage a l'electrode de tungstene

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6036583A (en) * 1997-07-11 2000-03-14 Applied Materials, Inc. Conditioner head in a substrate polisher and method
US6200199B1 (en) * 1998-03-31 2001-03-13 Applied Materials, Inc. Chemical mechanical polishing conditioner
US6386963B1 (en) * 1999-10-29 2002-05-14 Applied Materials, Inc. Conditioning disk for conditioning a polishing pad
US6514123B1 (en) * 2000-11-21 2003-02-04 Agere Systems Inc. Semiconductor polishing pad alignment device for a polishing apparatus and method of use
US20020127957A1 (en) * 2000-12-20 2002-09-12 Shipley Kevin D. Chemical mechanical polish pad conditioning device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536992A (en) * 1983-11-04 1985-08-27 Magnetic Peripherals Precision lapping system
US4941245A (en) * 1988-04-28 1990-07-17 Yamaha Hatsudoki Kabushiki Kaisha Rotary file, support member and abrasive device
US5575708A (en) * 1995-06-07 1996-11-19 Alligiance Corporation Belt grinding machine and method for forming cutting edges on surgical instruments
FR2747332A1 (fr) * 1996-04-12 1997-10-17 Emmanuel Maurin Dispositif pour l'affutage des electrodes de soudure
WO2000027588A1 (fr) * 1998-10-27 2000-05-18 Heine Plougman Olsen Appareil destine, en particulier, a la rectification d'electrodes pour soudage a l'electrode de tungstene

Also Published As

Publication number Publication date
ITCA20010001A0 (it) 2001-01-19
EP1258316A3 (fr) 2004-01-07
CA2368633A1 (fr) 2002-07-19
US20020137445A1 (en) 2002-09-26
ITCA20010001A1 (it) 2002-07-19

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