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EP1038632A2 - Procédé et broche de réparation pour remettre en état une surface de coupe d'un outil tranchant - Google Patents

Procédé et broche de réparation pour remettre en état une surface de coupe d'un outil tranchant Download PDF

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Publication number
EP1038632A2
EP1038632A2 EP00101403A EP00101403A EP1038632A2 EP 1038632 A2 EP1038632 A2 EP 1038632A2 EP 00101403 A EP00101403 A EP 00101403A EP 00101403 A EP00101403 A EP 00101403A EP 1038632 A2 EP1038632 A2 EP 1038632A2
Authority
EP
European Patent Office
Prior art keywords
cutting
repair pin
reference element
repair
grinding element
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Withdrawn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
EP00101403A
Other languages
German (de)
English (en)
Other versions
EP1038632A3 (fr
Inventor
Alfred Gräser
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1038632A2 publication Critical patent/EP1038632A2/fr
Publication of EP1038632A3 publication Critical patent/EP1038632A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/02—Wheels in one piece
    • 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
    • B24B17/00—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor
    • B24B17/02—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor involving mechanical transmission means only
    • 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
    • B24B3/60—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of tools not covered by the preceding subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/16—Bushings; Mountings

Definitions

  • the invention relates to a method and a device for restoring cutting surfaces in the course of the maintenance of cutting tools.
  • Cutting tools suffer wear during use, e.g. by blunting and Cutouts on the cutting edges and errors on the trimmed workpieces leads.
  • One method for restoring worn cutting edges is e.g. from the generic US 1 766 964 known. Here it is suggested to use the cutting tool of a rapidly rotating hammer so that material from the interior of the cutting tool is driven into the edge area and the cutting edge somewhat is moved outwards. The cutting tool does not need to do this from the cutting press to be removed. Protruding material on the cutting edge is removed when the Cutting die cut from the counter-die, so that one of the original shape equivalent cutting edge is to be restored. Because of the clipping of the protrusions from the counter-die, however, the method is not suitable for machining tools with a defined cutting gap got to. The method is also unsuitable for repairing larger outbreaks.
  • the invention is therefore based on the problem of removing excess material To improve cutting tools with the help of a repair pen so that a quick, inexpensive and reliable restoration of the cutting edges of cutting tools is possible.
  • the process is intended to cover a broad spectrum without additional modifications of cutting tools to be applicable.
  • the object is achieved by the method solved according to claim 1 and the device according to claim 6.
  • the repair pin used for grinding the cutting contours also includes an abrasive grinding element also a non-abrasive reference element that is in the radial direction of the repair pin is at least as large as the grinding element.
  • the cutting edge to be machined is now moved by hand against the rotating repair pin, excess material being removed in the region of the cutting edge by the grinding element becomes. This continues until the reference element comes into contact with the tool contour comes and prevents further penetration of the grinding element into the cutting tool.
  • the method is particularly suitable for the exact restoration of an original one Cutting edge that still exists on the cutting tool outside the repair area is, but was covered in the repair area by the excess material.
  • the cutting tool to be machined is thus opposite the rotating repair pin moves that the grinding element overlaps with the excess material and thus removes it, while the reference element with the original cutting edge in one from the repair unaffected area overlapped (see claim 2). So with the help of the grinding element the excess material is removed until the reference element comes into contact with the original Cutting surface comes and a further removal of excess material by the repair pin prevented.
  • the contour machined in this way corresponds to the repair area thus the original cutting edge - except for an offset, which is given by the different radial expansion of grinding element and reference element.
  • This offset is preferably a few hundredths of a millimeter and ensures that in the area of machined Cutting edge a small excess of material remains, which is in a post-processing document - if necessary - by hand or with a fine-toothed carbide cutter or a Diamond grinding pencil can be removed without offset (see claim 14).
  • the method according to the invention offers particular advantages when reworking Cutting tools with a contoured cutting edge, as there is a highly precise removal of the excess material along the (possibly complicated) curved cutting contour.
  • the inventive method the control of the grinding depth by the integrated in the repair pin Reference element, which significantly reduces processing time and longer Process reliability can be achieved.
  • the abrasive grinding element and for the reference element a rotationally symmetrical body selected (see claim 7).
  • Grinding element can also be selected a fine-toothed carbide cutter, with the help of which one high removal rate and a particularly good surface quality of the machined Area can be reached (see claim 15).
  • it can be fast and reproducible Removal of the surplus material is done by the repair pin around its Rotation axis is rotated (see claim 3).
  • the repair pin is clamped in a stationary (column) drill. This ensures a fixed and reproducible axis of rotation of the repair pin. To make sure a good repair result, the drill should enable high speeds and have a good runout.
  • the cutting surface of which is typically a constant one (usually right) angle to the top surface of the cutting tool is recommended the use of a cylindrical grinding element (see claim 9).
  • the reference element is expediently attached to the front of the grinding element (see claim 8), so that an axial overlap of the grinding element with the excess area to be machined with simultaneous axial overlap of the reference element with the original Cutting edge can be easily guaranteed. It is particularly advantageous - far less expensive it to fix the reference element by gluing (see claim 10) or the grinding element and to manufacture the reference element together from a single piece (see claim 11). To achieve good sliding properties of the reference element on the tool surface the reference element should be provided with a sliding paste (see claim 5).
  • the reference element can also be freely rotatably fastened on a spindle with the axis of rotation of the repair pin coincides (see claim 12).
  • the reference element can also be freely rotatably fastened on a spindle with the axis of rotation of the repair pin coincides (see claim 12).
  • FIG. 1 shows a repair pin 1 which has a cylindrical symmetrical grinding element 2 and a cylindrical symmetrical reference element 3.
  • the grinding element 2 consists of a hard material and is coated with an abrasive material, for example boron nitride or diamond powder.
  • the reference element 3 has a smooth surface and consists of a hard material which is characterized by a high lubricity compared to the material of the cutting tool to be machined.
  • the reference element 3 is made of stainless steel, but ceramic materials can also be used, for example.
  • the radius of the reference element 3 is larger than the radius of the grinding element 2 by an amount ⁇ , so that the reference element 3 projects radially beyond the grinding element.
  • the difference ⁇ between the radii of reference element 3 and grinding element 2 is advantageously approximately 0.005 to 0.010 mm.
  • the reference element 3 is attached to the grinding element 2, for example by gluing or by soldering.
  • the grinding element 2 also has a fitting bore 4, into which a mandrel 5 of the reference element 3 is pressed.
  • reference element 3 and grinding element 2 can be manufactured together from a single workpiece, as a result of which the mounting of reference element 3 on grinding element 2 is completely eliminated.
  • the repair pin 1 has a spindle 6, with the help of which the repair pin 1 in a Chuck or the collet of a (not shown) drill can be clamped.
  • a column drill is preferably used for this, through which a stationary and reproducible axis of rotation of the repair pin 1 is guaranteed.
  • the drill should run at high speeds (preferably 8000 / min or more) and have a good concentricity.
  • FIG. 2 shows the mode of action of the repair pin 1 for the repair of a cutting tool 7, which has a contoured cutting edge 8.
  • the top surface 9 of the Cutting tool 1 is planar, while cutting surface 10 has the contour of cutting edge 8 reflects.
  • a previous repair step e.g. by means of Laser cladding - in the upper area 11 of the cutting surface 10 a collection of Excess material 12 applied.
  • the lower area 13 adjacent to the upper area 11 the cutting surface 10 was not affected by the repair step. He therefore points the contour of the original cutting edge 8, which is also in the upper region of the cutting surface to be restored.
  • the repair pin 1 is opposite the cutting surface 10 aligned that the grinding element 2 axially overlaps with the excess material 12, while the reference element 3 axially with the lower region 13 of the cutting surface 10 overlaps, which has the original cutting contour 8.
  • the excess material 12 now becomes removed by the grinding element 2. This continues until the reference element 3 comes into contact with the lower region 13 of the cutting surface 10 and thereby the further Penetration of the grinding element 2 in the excess material 12 prevented.
  • the reference element 3 must be on the original (lower) area 13 of the cutting surface 10 can slide with little resistance so that when the - typically fast rotating - Reference element 1 with the cutting surface 13, the mutual abrasion is minimized and thus In the upper region 11 of the cutting surface 10, a highly precise removal of the Excess material 12 can be ensured. For this, it is useful to use the reference element 3 to be moistened with a sliding paste.
  • Figure 3 shows an alternative embodiment of the repair pin 1 ', in which the reference element 3 'by means of a spindle 14 which protrudes from the end face 15 of the grinding element 2' is rotatably supported relative to the grinding element 2.
  • the axis of the spindle 14 is identical with the axis of rotation of the grinding element 2 '.
  • the spindle is part of a Fitting screw 16, which extends through the reference element 3 'and into a fitting bore 17 and Thread 18 engages in the grinding element 2 '.
  • This movable mounting of the reference element 3 'an extremely low surface wear of the reference element 3' can be ensured because the reference element 3 'rotates freely with respect to the grinding element 2' can, if there is increased friction between the reference element 3 'and the original surface 13 of the cutting tool 7 occurs. This is particularly advantageous if the original Cutting surface 13 of the cutting tool 7 has a rough surface. On the In this case, the use of a sliding paste can be dispensed with.
  • a high-quality fine-toothed carbide milling cutter can be used as the grinding element 2 become.
  • the excess material 12 is not removed Grinding, but by peeling the surface.
  • grinding element 2 and reference element 3 do not need in the immediate vicinity to be arranged to each other. It is only important that the two elements are so the repair pin 1 are arranged that a simultaneous radial overlap of the grinding element 2 with the excess material 12 to be removed and the reference element 3 with the original cutting surface 13 is possible. For this, it proves to be particularly favorable if the reference element 3 is arranged on the end of the repair pin 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP00101403A 1999-03-26 2000-01-25 Procédé et broche de réparation pour remettre en état une surface de coupe d'un outil tranchant Withdrawn EP1038632A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999113789 DE19913789C2 (de) 1999-03-26 1999-03-26 Verfahren und Reparaturstift zur Wiederherstellung einer Schneidfläche an einem Schneidwerkzeug
DE19913789 1999-03-26

Publications (2)

Publication Number Publication Date
EP1038632A2 true EP1038632A2 (fr) 2000-09-27
EP1038632A3 EP1038632A3 (fr) 2003-07-09

Family

ID=7902535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00101403A Withdrawn EP1038632A3 (fr) 1999-03-26 2000-01-25 Procédé et broche de réparation pour remettre en état une surface de coupe d'un outil tranchant

Country Status (2)

Country Link
EP (1) EP1038632A3 (fr)
DE (1) DE19913789C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2783792A1 (fr) * 2013-03-27 2014-10-01 AV&R Vision Appareil et procédé pour mélanger une matière ajoutée avec un matériau de base sur un composant fabriqué

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016107881A1 (de) * 2016-04-28 2017-11-02 Gühring KG Verfahren zur Herstellung eines Werkzeugmoduls und Werkzeugmodul

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1766964A (en) * 1929-09-06 1930-06-24 Swan N Tevander Method of sharpening punches or the like
US4187046A (en) * 1977-12-29 1980-02-05 Henry Atherton Power tool
DE3144810A1 (de) * 1981-11-11 1983-05-19 Löhr & Bromkamp GmbH, 6050 Offenbach "schleifstift"
US4993896A (en) * 1988-12-13 1991-02-19 General Electric Company Edge contouring system
FR2642689A1 (fr) * 1989-02-09 1990-08-10 Peugeot Procede et dispositif pour l'affutage automatise de l'arete de coupe d'une piece d'outillage
US5197191A (en) * 1991-03-04 1993-03-30 General Electric Company Repair of airfoil edges

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2783792A1 (fr) * 2013-03-27 2014-10-01 AV&R Vision Appareil et procédé pour mélanger une matière ajoutée avec un matériau de base sur un composant fabriqué
US9346145B2 (en) 2013-03-27 2016-05-24 Av & R Vision And Robotics Inc Apparatus and method for blending added material with base material on a manufactured component

Also Published As

Publication number Publication date
DE19913789A1 (de) 2000-09-28
EP1038632A3 (fr) 2003-07-09
DE19913789C2 (de) 2001-10-18

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