EP0425872A2 - Procédé et dispositif pour la fabrication d'un disque de polissage - Google Patents

Procédé et dispositif pour la fabrication d'un disque de polissage Download PDF

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Publication number
EP0425872A2
EP0425872A2 EP90119664A EP90119664A EP0425872A2 EP 0425872 A2 EP0425872 A2 EP 0425872A2 EP 90119664 A EP90119664 A EP 90119664A EP 90119664 A EP90119664 A EP 90119664A EP 0425872 A2 EP0425872 A2 EP 0425872A2
Authority
EP
European Patent Office
Prior art keywords
polishing
mold part
casting compound
grinding
support plate
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.)
Granted
Application number
EP90119664A
Other languages
German (de)
English (en)
Other versions
EP0425872A3 (en
EP0425872B1 (fr
Inventor
Walter Knief
Reimer Wischmann
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.)
Phoenix AG
Original Assignee
Phoenix 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 Phoenix AG filed Critical Phoenix AG
Publication of EP0425872A2 publication Critical patent/EP0425872A2/fr
Publication of EP0425872A3 publication Critical patent/EP0425872A3/de
Application granted granted Critical
Publication of EP0425872B1 publication Critical patent/EP0425872B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
    • B24D13/12—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising assemblies of felted or spongy material, e.g. felt, steel wool, foamed latex
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
    • B24D3/22—Rubbers synthetic or natural
    • B24D3/26—Rubbers synthetic or natural for porous or cellular structure

Definitions

  • the invention relates to a method for producing a disk for polishing or grinding image slurries according to the preamble of claim 1.
  • Polishing or grinding wheels for processing glass, metal or other materials are known in various embodiments (DE-U-71 16 473, DE-A-26 32 012, DE-A-28 15 468, DE-A-34 16 186).
  • the actual polishing layer consists of a foamed special plastic.
  • This layer which is a few mm thick, is now glued by hand to a rubber support plate, then profiled, ie provided with profile grooves, so that a honeycomb pattern or segmentation is produced similar to the disk according to DE-U-71 16 473.
  • This profiling gives the disc flexibility; and the grooves, arranged in a star shape and radially, serve to distribute the liquid grinding suspension.
  • the method according to the invention according to the characterizing part of claim 1 has the following advantages: - Homogeneous and permanent connection of the polishing or grinding surface and the backing plate in one operation; - Form-side formation of the entire segmentation (star-shaped and radial grooves); all sharp edges and corners are rounded, therefore no notch effect; - The almost uniform wall thickness gives the polishing or grinding wheel the necessary flexibility; the significantly reduced material cross-sections reduce the internal heat generated by flexing work and, on the other hand, dissipate frictional heat better; - By using a hard polyurethane quality with a high modulus of elasticity, the mechanical-technological property level is significantly improved compared to a soft rubber quality.
  • the casting compound is first formed in a two-component reaction (process stage A) by reacting 1,5-naphthylene di-isocyanate (Desmodur 15; Bayer) with a polyester polyol (MG 2000).
  • the reaction temperature is 125 to 135 ° C, especially 130 ° C. This is followed by rapid cooling to 110 to 120 ° C (process stage B).
  • process stage C After adding 1,4-butanediol as crosslinker (chain extender) (process stage C), the casting compound is introduced into the feed opening of the rotary device after 45 seconds at the latest (process stage D).
  • the casting compound is introduced at a rotational speed of 320 to 350 revolutions / minute in two stages, batch I being about 2/3 of the total casting compound.
  • the pot life of the total casting compound is a maximum of 15 minutes, in particular 7 to 10 minutes.
  • the pot life is the period from the start of adding the crosslinker (liquid phase) to Crosslinking end of the casting compound (solid phase) understood. It is important here that within this pot life the casting compound forming the support plate completely fills the corresponding recesses of the rotary device with simultaneous air displacement. It is also important that the impregnation effect at the speed of rotation according to the invention is kept low compared to the foam plastic forming the polishing or abrasive coating with a simultaneously homogeneous connection.
  • the two-batch process described above is a particularly advantageous procedural measure from these two points of view.
  • the rotary device (1) consists essentially of a lower mold part (2), upper mold part (3), a loading opening (4) and a conical double chamber system (5, 6).
  • the segments forming the polishing and grinding covering made of foamed polyether urethane impregnated with inorganic substances are inserted.
  • the casting compound is introduced into the rotating device via the loading opening (4) which opens into the double-chamber system (5, 6). Due to the centrifugal forces, the casting compound is initially in the cone area (9, 10) of the chambers (5, 6). Finally, the casting compound reaches the recesses (12, 13) of the upper mold part (3) from the widest point (11) of this chamber system.
  • the temperatures of the lower mold part (2) and the upper mold part (3) are at least 100 ° C, in particular 110 ⁇ 5 ° C.
  • the volume ratio of the chamber (5) and the chamber (6) is 1: 2 to 1: 4.
  • Hole pins (14) form the bores (18) - FIGS. 3, 4 - within the support plate.
  • the disc (15) for polishing or grinding screens consists of the following parts: Support plate (16) with bores (17, 18, 19) and a cylindrical step (20) arranged on the rear; Polishing or grinding covering (21) which has segments (22, 23, 24); star-shaped grooves (25, 26, 27); radially extending grooves (28, 29); Indentation (30) in the center of the pane.
  • the support plate (16) made of solid polyurethane elastomer, in particular based on a polyester polyurethane, has a minimum hardness in Shore A of 90 ° and an elastic modulus of 50 to 60 MPa. Its thickness is approximately 4 mm or 8 mm (in the area of the segments 22, 23, 24).
  • the cylindrical step (20) has a depth of 8 to 12 mm and gives the disc a particularly high degree of flexibility.
  • the segments (22, 23, 24) of the polishing or grinding surface (21) are structured in three rows, in such a way that every second star-shaped groove (25, 26) is arranged continuously up to the recess (30) in the center of the wheel, while the star-shaped grooves (27) between them only extend to the radial groove (28).
  • the thickness of the segments (22, 23, 24) of the polishing or grinding covering (21) is 4 to 6 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Moulding By Coating Moulds (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP90119664A 1989-10-24 1990-10-13 Procédé et dispositif pour la fabrication d'un disque de polissage Expired - Lifetime EP0425872B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3935285 1989-10-24
DE3935285 1989-10-24

Publications (3)

Publication Number Publication Date
EP0425872A2 true EP0425872A2 (fr) 1991-05-08
EP0425872A3 EP0425872A3 (en) 1992-03-11
EP0425872B1 EP0425872B1 (fr) 1995-01-04

Family

ID=6392024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90119664A Expired - Lifetime EP0425872B1 (fr) 1989-10-24 1990-10-13 Procédé et dispositif pour la fabrication d'un disque de polissage

Country Status (3)

Country Link
EP (1) EP0425872B1 (fr)
AT (1) ATE116589T1 (fr)
DE (1) DE59008192D1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB456985A (en) * 1935-05-18 1936-11-18 Carborundum Co Improvements in abrasive articles
US3252775A (en) * 1962-04-10 1966-05-24 Tocci-Guilbert Berne Foamed polyurethane abrasive wheels
US3391423A (en) * 1964-08-07 1968-07-09 Osborn Mfg Co Apparatus for making abrasive articles
DE3219567A1 (de) * 1982-05-25 1983-12-01 SEA Schleifmittel Entwicklung Anwendung GmbH, 7530 Pforzheim Elastischer schleifkoerper und verfahren zu seiner herstellung
FR2540025B1 (fr) * 1983-01-28 1991-05-10 Precidia Outil rotatif comportant un corps de revolution pourvu d'elements actifs pour usiner des materiaux tels que du granit, du marbre ou un produit refractaire
DE3442230A1 (de) * 1984-11-19 1986-05-28 Tyrolit-Schleifmittelwerke Swarovski KG, Schwaz, Tirol Verfahren zur herstellung einer schleifscheibe

Also Published As

Publication number Publication date
EP0425872A3 (en) 1992-03-11
EP0425872B1 (fr) 1995-01-04
ATE116589T1 (de) 1995-01-15
DE59008192D1 (de) 1995-02-16

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