EP0425872A2 - Process and device for manufacturing a polishing disc - Google Patents

Process and device for manufacturing a polishing disc 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
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EP
European Patent Office
Prior art keywords
polishing
casting compound
mold part
grinding
grinding wheel
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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
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German (de)
French (fr)
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EP0425872B1 (en
EP0425872A3 (en
Inventor
Walter Knief
Reimer Wischmann
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Phoenix AG
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Phoenix AG
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    • 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.

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  • 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)

Abstract

The invention relates to a process for manufacturing a disc (15) for polishing or grinding display screens, comprising - a supporting plate (16) of elastomeric material and - a segmented polishing or grinding covering (21) of plastic, in particular of foamed plastic, the individual segments (22, 23, 24) being separated from one another by stelliformly and radially running grooves (25, 26, 27; 28, 29). The invention essentially comprises the following process steps: - the segments (22, 23, 24) are inserted into the cavities of the lower mould part of the rotation device; - after closing the rotation device, lower mould part and upper mould part are heated up; - the device is brought to a minimum rotational speed of 300 revolutions/minute; - the casting compound prepared in a mixing device, in particular based on a polyurethane elastomer, is mixed with a crosslinking agent; - after adding the crosslinking agent, the casting compound is brought as quickly as possible into the charging opening of the rotation device, from which it pours under the influence of the centrifugal force, while at the same time displacing air and undergoing crosslinkage, into the recesses within the upper mould part which form the supporting plate. o

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Scheibe zum Polieren bzw. Schleifen von Bildschlrmen gemäß Oberbegriff des Anspruchs 1.The invention relates to a method for producing a disk for polishing or grinding image slurries according to the preamble of claim 1.

Polier- bzw. Schleifscheiben für die Bearbeitung von Glas, Metall oder anderen Werkstoffen sind in verschiedenen Ausführungsformen bekannt (DE-U-71 16 473, DE-A-26 32 012, DE-A-28 15 468, DE-A-34 16 186).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).

Die heutigen superflachen Bildschirme haben eine asphärisch gekrümmte Oberfläche. Diese einwandfrei zu polieren bzw. zu schleifen, erfordert eine besonders konstruierte Polier- bzw. Schleifscheibe. Zur Drehrichtung der Scheibe kommt eine oszillierende Bewegung des Scheibenmittelpunktes über die Bildschirmfläche hinzu.Today's super flat screens have an aspherically curved surface. To polish or grind them properly requires a specially designed polishing or grinding wheel. In addition to the direction of rotation of the disk, there is an oscillating movement of the disk center over the screen area.

Die eigentliche Polierschicht besteht dabei aus einem geschäumtem Spezialkunststoff. Diese wenige mm-starke Schicht wird heute in aufwendiger Handarbeit auf eine Gummiträgerplatte geklebt, anschließend profiliert, d.h. mit Profilnuten versehen, so daß ähnlich der Scheibe nach der DE-U-71 16 473 ein Wabenmuster bzw. eine Segmentierung entsteht. Diese Profilierung verleiht der Scheibe Flexibilität; und die Nuten, sternförmig und radial angeordnet, dienen zur Verteilung der flüssigen Schleifsuspension.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.

Mit diesem Scheibenaufbau bzw. mit dem hier geschilderten Herstellungsverfahren sind jedoch folgende Nachteile verbunden:
- hoher manueller Aufwand beim Verkleben und Schneiden;
- Umweltbelastung durch Einsatz großer Mengen Cyanacrylatkleber;
- mangelnde Verklebung führt zu vorzeitigem Ausfall;
- durch Nachschneiden der Gummi-Trägerplatte besteht die Gefahr von Rißbildungen durch Kerbwirkung; solche Risse führen aufgrund der enormen Belastung zu vorzeitiger Zerstörung und damit zu Produktionsstillstand;
- ungünstige Ableitung der Friktionswärme durch notwendige, starke Querschnitte der Gummi-Trägerplatte;
- die durchschnittliche Lebensdauer der bisherigen Polier­scheibe beträgt je nach Schirmgröße lediglich 5000 bis 8000 Zyklen (= Bildschirme).However, the following disadvantages are associated with this pane structure or with the manufacturing process described here:
- high manual effort for gluing and cutting;
- Environmental pollution due to the use of large amounts of cyanoacrylate adhesive;
- insufficient bonding leads to premature failure;
- by re-cutting the rubber backing plate, there is a risk of cracking due to the notch effect; Such cracks lead to premature destruction due to the enormous load and thus to production stoppage;
- unfavorable dissipation of the frictional heat due to necessary, strong cross sections of the rubber carrier plate;
- The average lifespan of the previous polishing wheel is only 5000 to 8000 cycles (= screens), depending on the screen size.

Das erfindungsgemäße Verfahren gemäß Kennzeichen des Anspruchs 1 bringt dagegen folgende Vorteile:
- homogene und dauerhafte Verbindung des Polier- bzw. Schleifbelages und des Stütztellers in einem Arbeitsgang;
- formseitige Ausbildung der gesamten Segmentierung (stern­förmig und radial verlaufende Nuten); alle scharfen Kanten und Ecken sind verrundet, daher keine Kerbwirkung;
- durch nahezu gleichmäßigen Wanddickenverlauf erhält die Polier- bzw. Schleifscheibe die nötige Flexibilität; die erheblich reduzierten Materialquerschnitte vermindern durch Walkarbeit entstehende innere Wärmeentwicklung und führen andererseits Reibungswärme besser ab;
- durch den Einsatz einer harten Polyurethan-Qualität mit hohem E-Modul wird im Vergleich zu einer weichen Gummi-­Qualität das mechanisch-technologische Eigenschaftsniveau wesentlich verbessert.In contrast, 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.

Alle Punkte zusammengenommen verleihen der Polier- bzw. Schleifscheibe eine wesentlich höhere Lebensdauer, Betriebs­sicherheit und Wirtschaftlichkeit.All points taken together give the polishing or grinding wheel a significantly longer service life, operational safety and economy.

Die Erfindung wird nun anhand von Ausführungsbeispielen unter Bezugnahme auf schematische Zeichnungen näher erläutert. Es zeigen:

  • Fig. 1 den Verfahrensablauf in Form eines Blockschemas;
  • Fig. 2 Rotationsvorrichtung;
  • Fig. 3 Polier- bzw. Schleifscheibe (Frontansicht);
  • Fig. 4 Polier- bzw. Schleifscheibe (Schnittansicht)
The invention will now be explained in more detail using exemplary embodiments with reference to schematic drawings. Show it:
  • Figure 1 shows the process flow in the form of a block diagram.
  • Fig. 2 rotation device;
  • Fig. 3 polishing or grinding wheel (front view);
  • 4 polishing or grinding wheel (sectional view)

Nach Fig. 1 wird zunächst im Rahmen einer Zwei-Komponenten-­Reaktion (Verfahrensstufe A) durch Umsetzung von 1,5-Naphthylen-­di-isocyanat (Desmodur 15; Fa. Bayer) mit einem Polyesterpolyol (MG 2000) die Gießmasse gebildet. Die Reaktionstemperatur beträgt 125 bis 135°C, insbesondere 130°C. Anschließend erfolgt eine rasche Abkühlung auf 110 bis 120°C (Verfahrensstufe B). Nach Zugabe von Butandiol-1,4 als Vernetzer (Kettenverlängerer) (Verfahrensstufe C) wird die Gießmasse spätestens nach 45 sec in die Beschickungsöffnung der Rotationsvorrichtung gebracht (Verfahrensstufe D). Das Einbringen der Gießmasse bei einer Rotationsgeschwindigkeit von 320 bis 350 Umdrehungen/Minute erfolgt dabei in zwei Stufen, wobei die Charge I etwa 2/3 der Gesamtgießmasse ist. Die Zugabe der Charge II wird 3 bis 5 Minuten nach Eingeben der Charge I vorgenommen. Die Topfzeit der Gesamtgießmasse beträgt maximal 15 Minuten, insbesondere 7 bis 10 Minuten. Unter der Topfzeit wird hier der Zeitraum von Beginn der Zugabe des Vernetzers (flüssige Phase) bis zum Vernetzungsende der Gießmasse (feste Phase) verstanden. Wichtig dabei ist, daß innerhalb dieser Topfzeit die den Stützteller bildende Gießmasse bei gleichzeitiger Luftverdrängung vollständig die entsprechenden Aussparungen der Rotations­vorrichtung ausfüllt. Von Bedeutung ist ferner, daß der Tränkungseffekt bei der erfindungsgemäßen Rotationsgeschwindig­keit gegenüber dem den Polier- bzw. Schleifbelag bildenden Schaumkunststoff bei gleichzeitig homogener Verbindung niedrig gehalten wird. Das oben geschilderte Zwei-Chargen-Verfahren ist unter diesen beiden Gesichtspunkten eine besonders vorteilhafte verfahrenstechnische Maßnahme.1, 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). 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. Batch II is added 3 to 5 minutes after batch I has been added. 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.

Nach Fig. 2 besteht die Rotationsvorrichtung (1) im wesentlichen aus einem Formunterteil (2), Formoberteil (3), einer Beschickungs­öffnung (4) sowie einem konischen Doppelkammersystem (5, 6). In die Nester (7, 8) des Formunterteils (3) werden die den Polier- und Schleifbelag bildenden Segmente aus geschäumtem, mit anorganischen Substanzen getränktem Polyetherurethan eingesetzt. Das Einbringen der Gießmasse in die Rotationsvorrichtung erfolgt über die Beschickungsöffnung (4), die in das Doppelkammersystem (5, 6) mündet. Aufgrund der Zentrifugalkräfte hält sich die Gießmasse zunächst im Konus-Bereich (9, 10) der Kammern (5, 6) auf. Schließlich gelangt die Gießmasse von der breitesten Stelle (11) dieses Kammersystems aus in die Aussparungen (12, 13) des Formoberteils (3). Die Temperaturen des Formunterteils (2) und des Formoberteils (3) betragen mindestens 100°C, insbesondere 110 ± 5°C. Bezüglich der Gießmassenverteilung ist es zweckmäßig, wenn das Volumenverhältnis der Kammer (5) und der Kammer (6) 1 : 2 bis 1 : 4 beträgt. Lochstifte (14) bilden die Bohrungen (18) - Fig. 3, 4 - innerhalb des Stütztellers.2, 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). In the nests (7, 8) of the lower mold part (3), 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. With regard to the casting compound distribution, it is expedient if 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.

Nach den Fig. 3 und 4 besteht die Scheibe (15) zum Polieren bzw. Schleifen von Bildschirmen aus folgenden Teilen:
Stützteller (16) mit Bohrungen (17, 18, 19) und einer rückseitig angeordneten zylindrischen Abstufung (20);
Polier- bzw. Schleifbelag (21), der Segmente (22, 23, 24) aufweist;
sternförmig verlaufende Nuten (25, 26, 27);
radial verlaufende Nuten (28, 29);
Vertiefung (30) im Scheibenmittelpunkt.3 and 4, 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.

Der Stützteller (16) aus massivem Polyurethan-Elastomer, insbesondere auf der Basis eines Polyester-Polyurethans, weist eine Mindesthärte in Shore A von 90° und einen Elastizitäts­modul von 50 bis 60 MPa auf. Seine Stärke beträgt etwa 4 mm bzw. 8 mm (im Bereich der Segmente 22, 23, 24). Die zylin­drische Abstufung (20) weist eine Tiefe von 8 bis 12 mm auf und verleiht der Scheibe eine besonders hohe Flexibilität.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.

Die Segmente (22, 23, 24) des Polier- bzw. Schleifbelages (21) sind dreireihig strukturiert, und zwar derart, daß jede zweite sternförmig verlaufende Nut (25, 26) bis zur Vertiefung (30) im Scheibenmittelpunkt durchgehend angeordnet ist, während die dazwischen liegenden sternförmig verlaufenden Nuten (27) nur bis zur Radialnut (28) reichen. Die Stärke der Segmente (22, 23, 24) des Polier- bzw. Schleifbelages (21) beträgt 4 bis 6 mm.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.

Claims (25)

1. Verfahren zur Herstellung einer Scheibe (15) zum Polieren bzw. Schleifen von Bildschirmen, bestehend aus
- einem Stützteller (16) aus elastomerem Werkstoff und
- einem segmentierten Polier- bzw. Schleifbelag (21) aus Kunststoff, insbesondere aus geschäumtem Kunst­stoff, wobei die einzelnen Segmente (22, 23, 24) durch sternförmig und radial verlaufende Nuten (25, 26, 27; 28, 29) voneinander getrennt sind,
gekennzeichnet durch folgende Verfahrensschritte:
- in die Nester (7, 8) des Formunterteils (2) der Rotationsvorrichtung (1) werden die Segmente (22, 23, 24) eingesetzt;
- nach Schließen der Rotationsvorrichtung (1) werden Formunterteil (2) und Formoberteil (3) aufgeheizt;
- die Vorrichtung (1) wird auf eine Mindestrotations­geschwindigkeit von 300 Umdrehungen/Minute gebracht;
- die in einer Mischvorrichtung hergestellte Gießmasse, insbesondere auf der Basis eines Polyurethan-­Elastomers, wird mit einem Vernetzer versetzt;
- nach Zugabe des Vernetzers wird die Gießmasse möglichst schnell in die Beschickungsöffnung (4) der Rotations­vorrichtung (1) gebracht, wovon aus sie sich unter dem Einfluß der Zentrifugalkraft bei gleichzeitiger Luftverdrängung und Vernetzung in die den Stützteller (16) bildenden Aussparungen (12, 13) innerhalb des Formoberteils (3) ergießt.1. A method for producing a disc (15) for polishing or grinding screens, consisting of
- A support plate (16) made of elastomeric material and
- A segmented polishing or grinding covering (21) made of plastic, in particular made of foamed plastic, the individual segments (22, 23, 24) being separated from one another by star-shaped and radial grooves (25, 26, 27; 28, 29) ,
characterized by the following process steps:
- In the nests (7, 8) of the lower mold part (2) of the rotating device (1), the segments (22, 23, 24) are inserted;
- After closing the rotating device (1), the lower mold part (2) and upper mold part (3) are heated;
- The device (1) is brought to a minimum rotational speed of 300 revolutions / minute;
- The casting compound produced in a mixing device, in particular based on a polyurethane elastomer, is mixed with a crosslinker;
- After the addition of the crosslinking agent, the casting compound is brought as quickly as possible into the loading opening (4) of the rotating device (1), from which it emerges under the influence of the centrifugal force with simultaneous air displacement and crosslinking into the recesses (12, 13) forming the support plate (16) ) pours inside the upper mold part (3). 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Mindestemperatur des Formunterteils (2) und Formoberteils (3) 100 °C beträgt.2. The method according to claim 1, characterized in that the minimum temperature of the lower mold part (2) and upper mold part (3) is 100 ° C. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Formentemperatur 110 ± 5°C beträgt.3. The method according to claim 2, characterized in that the mold temperature is 110 ± 5 ° C. 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Rotationsgeschwindigkeit 320 bis 400 Umdrehungen/Minute, insbesondere 320 bis 350 Umdrehungen/
Minute, beträgt.4. The method according to any one of claims 1 to 3, characterized in that the rotational speed 320 to 400 revolutions / minute, in particular 320 to 350 revolutions /
Minute. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Herstellung der Gießmasse in der Mischvorrichtung bei 125 bis 135°C erfolgt.5. The method according to any one of claims 1 to 4, characterized in that the casting compound is produced in the mixing device at 125 to 135 ° C. 6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß als Gießmasse ein Polyester-Polyurethan verwendet wird.6. The method according to any one of claims 1 to 5, characterized in that a polyester-polyurethane is used as the casting compound. 7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß das Polyester-Polyurethan durch Umsetzung von 1,5-Naphthylen-­diisocyanat mit einem Polyesterpolyol (MG 2000) gebildet wird.7. The method according to claim 6, characterized in that the polyester-polyurethane is formed by reacting 1,5-naphthylene diisocyanate with a polyester polyol (MW 2000). 8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß als Vernetzer Butandiol-1,4 verwendet wird.8. The method according to any one of claims 1 to 7, characterized in that 1,4-butanediol is used as the crosslinking agent. 9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Gießmasse vor der Zugabe des Vernetzers auf eine Temperatur von 110 bis 120°C gebracht wird.9. The method according to any one of claims 1 to 8, characterized in that the casting compound is brought to a temperature of 110 to 120 ° C before the addition of the crosslinking agent. 10. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Gießmasse spätestens 45 sec nach Zugabe des Vernetzers in die Beschickungsöffnung (4) der Rotationsvorrichtung (1) gegeben wird.10. The method according to any one of claims 1 to 9, characterized in that the casting compound is placed in the loading opening (4) of the rotating device (1) at the latest 45 seconds after the addition of the crosslinking agent. 11. Verfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Topfzeit der Gießmasse maximal 15 Minuten beträgt.11. The method according to any one of claims 1 to 10, characterized in that the pot life of the casting compound is a maximum of 15 minutes. 12. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß die Topfzeit 7 bis 10 Minuten beträgt.12. The method according to claim 11, characterized in that the pot life is 7 to 10 minutes. 13. Verfahren nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß das Einbringen der Gießmasse in zwei Stufen (Chargen I und II) erfolgt.13. The method according to any one of claims 1 to 12, characterized in that the casting compound is introduced in two stages (batches I and II). 14. Verfahren nach Anspruch 13, dadurch gekennzeichnet, daß die Zugabe der Charge II 3 bis 5 Minuten nach Einbringen der Charge I erfolgt.14. The method according to claim 13, characterized in that the addition of batch II takes place 3 to 5 minutes after introduction of batch I. 15. Verfahren nach Anspruch 13 oder 14, dadurch gekennzeichnet, daß die Charge I etwa 2/3 der Gesamtgießmasse ist.15. The method according to claim 13 or 14, characterized in that the batch I is about 2/3 of the total casting mass. 16. Rotationsvorrichtung für ein Verfahren nach einem der Ansprüche 1 bis 15, dadurch gekennzeichnet, daß die im Zentrum der Vorrichtung angeordnete Beschickungsöffnung (4) in ein konisches Doppelkammersystem (5, 6) mündet, wobei von der breitesten Stelle (11) dieses Kammersystems aus sich die Gießmasse in die Aussparungen (12, 13) des Formoberteils (3) ergießt.16. Rotary device for a method according to any one of claims 1 to 15, characterized in that the loading opening (4) arranged in the center of the device opens into a conical double-chamber system (5, 6), from the widest point (11) of this chamber system the casting compound pours into the recesses (12, 13) of the upper mold part (3). 17. Rotationsvorrichtung nach Anspruch 16, dadurch gekennzeichnet, daß die Kammer (6) innerhalb des Formunterteils (2) ein größeres Volumen aufweist als die Kammer (5) innerhalb des Formoberteils (3)17. Rotating device according to claim 16, characterized in that the chamber (6) within the lower mold part (2) has a larger volume than the chamber (5) within the upper mold part (3) 18. Rotationsvorrichtung nach Anspruch 17, dadurch gekennzeichnet, daß das Volumenverhältnis der Kammer (5) zur Kammer (6) 1 : 2 bis 1 : 4 beträgt.18. Rotation device according to claim 17, characterized in that the volume ratio of the chamber (5) to the chamber (6) is 1: 2 to 1: 4. 19. Polier- bzw. Schleifscheibe hergestellt nach dem Verfahren bzw. mittels der Vorrichtung gemäß einem der Ansprüche 1 bis 18, dadurch gekennzeichnet, daß der Stützteller (16) aus massivem Polyurethan-Elastomer eine große Härte, insbesondere eine Mindesthärte in Shore A von 90°, sowie einen hohen Elastizitätsmodul, insbesondere von 50 bis 60 MPa, aufweist.19. Polishing or grinding wheel produced by the method or by means of the device according to one of claims 1 to 18, characterized in that the support plate (16) made of solid polyurethane elastomer has a high hardness, in particular a minimum hardness in Shore A of 90 °, and a high modulus of elasticity, in particular from 50 to 60 MPa. 20. Polier- bzw. Schleifscheibe nach einem der Ansprüche 1 bis 19, dadurch gekennzeichnet, daß die Segmente (22, 23, 24) des Polier- bzw. Schleifbelages (21) aus geschäumtem, mit anorganischen Substanzen getränktem Polyetherurethan bestehen.20. Polishing or grinding wheel according to one of claims 1 to 19, characterized in that the segments (22, 23, 24) of the polishing or grinding covering (21) consist of foamed polyether urethane impregnated with inorganic substances. 21. Polier- bzw. Schleifscheibe nach einem der Ansprüche 1 bis 20, dadurch gekennzeichnet, daß die Segmente (22, 23, 24) dreireihig strukturiert sind, und zwar derart, daß jede zweite sternförmig verlaufende Nut (25, 26) bis zur Vertiefung (30) im Scheibenmittelpunkt durchgehend angeordnet sind, während die dazwischen liegenden sternförmig verlaufenden Nuten (27) nur bis zur Radialnut (28) reichen.21. Polishing or grinding wheel according to one of claims 1 to 20, characterized in that the segments (22, 23, 24) are structured in three rows, in such a way that every second star-shaped groove (25, 26) to the recess (30) are arranged continuously in the center of the disc, while the star-shaped grooves (27) lying between them only extend as far as the radial groove (28). 22. Polier- bzw. Schleifscheibe nach einem der Ansprüche 1 bis 21, dadurch gekennzeichnet, daß der Stützteller (16) rückseitig eine zylindrische Abstufung (20) aufweist.22. Polishing or grinding wheel according to one of claims 1 to 21, characterized in that the support plate (16) has a cylindrical step (20) on the back. 23. Polier- bzw. Schleifscheibe nach Anspruch 22, dadurch gekennzeichnet, daß die Tiefe der Abstufung (20) 8 bis 12 mm beträgt.23. Polishing or grinding wheel according to claim 22, characterized in that the depth of the gradation (20) is 8 to 12 mm. 24. Polier- bzw. Schleifscheibe nach einem der Ansprüche 1 bis 23, dadurch gekennzeichnet, daß der Stützteller (16) eine Stärke von etwa 4 mm bzw. 8 mm (im Bereich der Segmente 22, 23, 24) aufweist.24. Polishing or grinding wheel according to one of claims 1 to 23, characterized in that the support plate (16) has a thickness of about 4 mm or 8 mm (in the region of the segments 22, 23, 24). 25. Polier- bzw. Schleifscheibe nach einem der Ansprüche 1 bis 24, dadurch gekennzeichnet, daß der segmentierte Polier- bzw. Schleifbelag (21) eine Stärke von 4 bis 6 mm aufweist.25. Polishing or grinding wheel according to one of claims 1 to 24, characterized in that the segmented polishing or grinding covering (21) has a thickness of 4 to 6 mm.
EP90119664A 1989-10-24 1990-10-13 Process and device for manufacturing a polishing disc Expired - Lifetime EP0425872B1 (en)

Applications Claiming Priority (2)

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

Publications (3)

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

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Application Number Title Priority Date Filing Date
EP90119664A Expired - Lifetime EP0425872B1 (en) 1989-10-24 1990-10-13 Process and device for manufacturing a polishing disc

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EP (1) EP0425872B1 (en)
AT (1) ATE116589T1 (en)
DE (1) DE59008192D1 (en)

Citations (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
DE1502649A1 (en) * 1964-08-07 1969-06-04 Osborn Mfg Co Method and device for the production of grinding tools
FR2540025A1 (en) * 1983-01-28 1984-08-03 Precidia Rotating tool comprising a body of revolution provided with active elements for machining materials such as granite, marble or a refractory product
US4539017A (en) * 1982-05-25 1985-09-03 Sea Schleifmittel Entwicklung Anwendung Gmbh Elastic grinding element and method for producing it
DE3442230A1 (en) * 1984-11-19 1986-05-28 Tyrolit-Schleifmittelwerke Swarovski KG, Schwaz, Tirol Process for producing a grinding wheel

Patent Citations (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
DE1502649A1 (en) * 1964-08-07 1969-06-04 Osborn Mfg Co Method and device for the production of grinding tools
US4539017A (en) * 1982-05-25 1985-09-03 Sea Schleifmittel Entwicklung Anwendung Gmbh Elastic grinding element and method for producing it
FR2540025A1 (en) * 1983-01-28 1984-08-03 Precidia Rotating tool comprising a body of revolution provided with active elements for machining materials such as granite, marble or a refractory product
DE3442230A1 (en) * 1984-11-19 1986-05-28 Tyrolit-Schleifmittelwerke Swarovski KG, Schwaz, Tirol Process for producing a grinding wheel

Also Published As

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

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