EP0283550B1 - Grinding belt - Google Patents
Grinding belt Download PDFInfo
- Publication number
- EP0283550B1 EP0283550B1 EP87108574A EP87108574A EP0283550B1 EP 0283550 B1 EP0283550 B1 EP 0283550B1 EP 87108574 A EP87108574 A EP 87108574A EP 87108574 A EP87108574 A EP 87108574A EP 0283550 B1 EP0283550 B1 EP 0283550B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- abrasive grain
- grinding belt
- grain
- abrasive
- width
- 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.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
- B24D11/06—Connecting the ends of materials, e.g. for making abrasive belts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Adhesive Tapes (AREA)
Abstract
Description
Die Neuerung betrifft ein Schleifband, welches auf mindestens einer Seite mit Schleifkorn beschichtet ist und mit einem geradegeschnittenen Stoßverschluß mit druckseitig auf- oder eingelegtem Verbindungsstreifen versehen ist.The innovation relates to an abrasive belt which is coated with abrasive grain on at least one side and is provided with a straight-cut butt joint with a connecting strip placed or inserted on the pressure side.
Schleifbänder bestehen aus einer mit Schleifmittel belegten Unterlage. Als Material für die Unterlage werden dabei Substrate aus Papier, Gewebe oder Papiergewebekombination bevorzugt. Um aus der schleifmittelbeschichteten Unterlage ein Schleifband herzustellen, muß der entsprechende Zuschnitt des Schleifbandes endlos gemacht werden. Dazu werden die Enden des Schleifbandzuschnitts stumpf gestoßen und miteinander verbunden. An die Güte der Bandverschlüsse werden im Hinblick auf Haltbarkeit und Maßgenauigkeit sehr hohe Anforderungen gestellt. Oft ist die Güte der Verbindungsstelle ausschlaggebend für die Qualität des errecihbaren Schliffbildes. Es gibt die unterschiedlichsten Ausführungsformen von Schleifbandverschlüssen. Die wohl bekannteste und älteste Ausführungsform ist der Lappverschluß. Dabei wird der Schleifbandzuschnitt an seinen beiden Enden angeschärft, und zwar im Ober- und Unterlappen in unterschiedlicher Ausführung. Die beiden angeschrägten Enden werden mit Klebstoff versehen und übereinandergelegt und verpreßt.Abrasive belts consist of an underlay coated with abrasive. Substrates made of paper, tissue or paper-tissue combination are preferred as the material for the base. In order to produce an abrasive belt from the abrasive-coated underlay, the corresponding cutting of the abrasive belt must be made endless. To do this, the ends of the abrasive belt cut are butted and joined together. The quality of the band fasteners is subject to very high demands with regard to durability and dimensional accuracy. The quality of the connection point is often decisive for the quality of the accessible micrograph. There are various designs of abrasive belt closures. The best-known and oldest embodiment is the Lapp lock. The abrasive belt cut is sharpened at both ends, in different ways in the upper and lower lobes. The two bevelled ends are provided with adhesive and placed one above the other and pressed together.
Während man bei makroskopisch weitgehend homogenen Papierunterlagen auf diese Weise maßgenaue Lappverschlüsse mit hoher Maßgenauigkeit (Dickentoleranz von ±0) anfertigen kann, ist dies bei Gewebe und Papier-Gewebe-Kominations-Unterlagen konstruktionsbedingt nicht möglich. Um bei Gewebe-Unterlagen Festigkeitseinbußen zu vermeiden, müssen die tragenden Gewebefäden überlappt verklebt werden, was dann konstruktionsbedingt zwangsweise zu Überhöhungen in der Dicke führt. Diese Überhöhungen erzeugen auf den geschliffenen Werkstücken Schattierungen, sogenannte Rattermarken. Derartige Schliffbilder werden heute meißt nur noch im Vorschliff akzeptiert. Für den Endschliff werden verbesserte Verbindungsstellen benötigt. Zur Vermeidung von Rattermarken wurde es daher bei Lapperverschlüssen schon bald üblich, die Verschlußzone ganz oder teilweise kornfrei zu machen, um das Ausmaß der Überhöhung zu reduzieren. Dennoch zeigen solche kornfreien Verschlüsse meist noch Markierungen, insbesondere dann, wenn die kornfreie Zone eine bestimmte Breite überschreitet. Ein weiterer Nachteil ist sehr oft, daß die Verschlußzonen sich beim Schleifen durchscheuern, wodurch das Schleifband zerstört wird. Kornfreie Lappverschlüsse lassen auch nur im groben und mittleren Kornbereich Verbesserungen erwarten. Für den Feinkornbereich sind sie nicht geeignet. Ein anderes Mittel zur Lösung des Problems ist der sogenannte Stoßverschluß. Die Schleifbandzuschnitte werden hierbei an den Enden nicht mehr angeschrägt, sondern sie werden druckseitig mit einem Verbindungsstreifen verklebt, der die Stoßfuge überbrückt.While with macroscopically largely homogeneous paper underlays in this way, dimensionally accurate flaps with high dimensional accuracy (thickness tolerance of ± 0) can produce, this is not possible for tissue and paper-tissue combination documents due to the design. In order to avoid loss of strength in the case of fabric underlays, the load-bearing fabric threads must be glued overlapping, which inevitably leads to increases in thickness due to the design. These peaks create shading, so-called chatter marks, on the ground workpieces. Such micrographs are today mostly only accepted in pre-grinding. Improved joints are required for the final sanding. In order to avoid chatter marks, it soon became common practice in Lapper closures to make the closure zone completely or partially grain-free in order to reduce the extent of the cant. Nevertheless, such grain-free closures usually still show markings, especially when the grain-free zone exceeds a certain width. Another disadvantage is very often that the closure zones wear through during grinding, which destroys the sanding belt. Grain-free flaps can only be expected to improve in the coarse and medium grain area. They are not suitable for the fine grain range. Another means of solving the problem is the so-called butt lock. The sanding belt cuts are no longer beveled at the ends, but are glued on the pressure side with a connecting strip that bridges the butt joint.
Aber auch so hergestellte Schleifbänder zeigen im Verschlußbereich eine Überhöhung, die der Stärke des Verbindungsstreifens entspricht. Man hat daher versucht, als Verbindungsstreifen dünne, aber hochfeste Materialien einzusetzen, um die Erhöhung möglichst gering zu halten. Ein weiterer Schritt in dieser Richtung ist die Maßnahme, druckseitig etwas Material abzutragen, soweit dies ohne Schädigung der Unterlagen möglich ist. Aber auch die besten bekannten Stoßverschlüsse zeigen meist im Verbindungsstellenbereich eine störende Versteifung.However, abrasive belts produced in this way also show an elevation in the closure area which corresponds to the thickness of the connecting strip. Attempts have therefore been made to use thin but high-strength materials as connecting strips in order to keep the increase as low as possible. Another step in this direction is the measure of removing some material on the pressure side, as far as this is possible without damaging the documents. But also the best Known butt locks usually show a disturbing stiffening in the area of the connection points.
Zur Verbesserung der Maßtoleranz hat man dann bei Schleifmitteln auf Papier-Gewebe-Kombination Verbindungsstellen mit eingelegtem Verbindungsstreifen hergestellt, die so konstruiert sind, daß die Papierlage beidseitig der Verbindungsstelle in einer Breite von ca. 10 mm entfernt wird und durch eine Verbindungsfolie ersetzt wird, die die Stoßfuge überbrückt. Man kann auf diese Weise Bandverschlüsse mit einer Maßgenauigkeit von ±0 mm oder sogar mit Untermaß herstellen. Dennoch zeigen derartige Verschlüsse bei empfindlichen Werkstücken noch Markierungen auf der geschliffenen Oberfläche.In order to improve the dimensional tolerance, joints with an inserted connecting strip were then produced for abrasives on paper-tissue combination, which are constructed in such a way that the paper layer on both sides of the joint is removed in a width of approx. 10 mm and is replaced by a connecting film bridged the butt joint. In this way, band closures can be produced with a dimensional accuracy of ± 0 mm or even with undersize. Nevertheless, such closures still show markings on the ground surface of sensitive workpieces.
Markierungen sind generell bei Geradschnitt-Stoßverschlüssen erkennbar, wenn sie bei empfindlichen Werkstücken eingesetzt werden. Um die Knickbewegung in der Verbindungsstelle, welche unter anderem für die unerwünschten Markierungen verantwortlich gemacht wird, zu vermeiden, hat man Stoßverschlüsse mit Wellenschnitt angefertigt. Diese Verschlüsse zeigen zwar gegenüber dem Geradschnittverschluß eine gewisse Verbesserung, haben jedoch andere Nachteile:
- es werden teure, nur schwer herzustellende und verschleißanfällige Schneidwerkzeuge benötigt,
- die Verschlußzone wird zwangsläufig breiter,
- Versteifung des Schleifbandes tritt in einem größeren Bereich auf.
- expensive cutting tools that are difficult to manufacture and susceptible to wear are required,
- the closure zone inevitably widens,
- Stiffening of the sanding belt occurs in a larger area.
Es wurde nun gefunden, daß man das Schliffbild bei Geradschnitt-Stoßverschlüssen entscheidend verbessern kann, wenn man im Verschlußbereich kornseitig eine schmale kornarme oder kornfreie Zone schafft, die beidseitig der Stoßfuge mindestens 2 mm beträgt. Beim Entfernen des Schleifkorns kann sowohl ein stufenförmiger Übergang von der Schleifkornschicht zur Stoßfuge geschaffen werden, bevorzugt wird jedoch ein abgeschrägter Übergang. Die kornfreie oder -arme Zone ist vorzugsweise schmaler als der Verbindungsstreifen, und zwar 1/3 bis 1/4 von dessen Breite.It has now been found that the grinding pattern in straight-cut butt closures can be decisively improved if a narrow, low-grain or grain-free zone is created in the closure area on the grain side, which is at least 2 mm on both sides of the butt joint. When removing the abrasive grain, both a step-like transition from the abrasive grain layer to the butt joint can be created, but a beveled transition is preferred. The grain-free or low-grain zone is preferably narrower than the connecting strip, namely 1/3 to 1/4 of its width.
Schleifbänder mit dieser Verbindungsstelle zeigen bei empfindlichen Schleifoperationen, zum Beispiel beim Schleifen von Spanplatten, einen markierungsfreien einwandfreien Schliff. Die mit neuen Verschlüssen hergestellten Schleifbänder zeigen auch ein insgesamt ruhiges Laufverhalten. Dadurch wird auch die Oszillation der Schleifbänder weniger gestört, was die hierdurch bewirkte Ausbildung von unerwünschten Längsstreifen verzögert. Die Haltbarkeit der Verschlüsse ist erhöht.Abrasive belts with this connection point show a mark-free, perfect sanding during sensitive sanding operations, for example when sanding chipboard. The sanding belts manufactured with new closures also show an overall smooth running behavior. As a result, the oscillation of the sanding belts is less disturbed, which delays the formation of undesirable longitudinal stripes caused thereby. The durability of the closures is increased.
In der Zeichnung sind Ausführungsbeispiele des neuheitsgemäßen Schleifbandes dargestellt. Gleiche Teile sind mit denselben Bezugszeichen versehen.In the drawing, exemplary embodiments of the novelty grinding belt are shown. The same parts are provided with the same reference numerals.
Die Enden 1a, 1b des endlos gemachten Schleifbandes 1 (Fig. 1) bilden gemaß der Ausschnittsvergrößerung in den Fig. 2 bis 5 die Stoßfuge 2 und sind über einen aufgelegten (Fig. 2 und 3) oder eingelegten (Fig. 4 und 5) Streifen 3 miteinander verbunden. Außenseitig ist das Schleifband 1 mit einer Schleifkornschicht 4 versehen. Diese verläuft zur Stoßfuge 2 hin entweder stufenförmig (Fig. 2 und 4) oder bevorzugt abgeschrägt (Fig. 3 und 5).The
Claims (3)
- A grinding belt coated with abrasive grain on at least one side and having an abutment closure which is cut straight and has connecting strips applied or inserted on the pressure side, characterized in that a zone free from or reduced in abrasive grain is provided over a minimum width of 2 mm in the area of the closure on both sides of the joint (2).
- A grinding belt according to claim 1, characterized in that the zone free from or reduced in abrasive grain has a width of one quarter to one third of the width of the connecting strip (3).
- A grinding belt according to claims 1 or 2, characterized in that the layer (4) of abrasive grain is chamfered in the direction of the joint (2).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87108574T ATE73373T1 (en) | 1987-03-25 | 1987-06-13 | ABRASIVE BELTS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8704435U DE8704435U1 (en) | 1987-03-25 | 1987-03-25 | |
DE8704435U | 1987-03-25 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0283550A2 EP0283550A2 (en) | 1988-09-28 |
EP0283550A3 EP0283550A3 (en) | 1990-02-28 |
EP0283550B1 true EP0283550B1 (en) | 1992-03-11 |
Family
ID=6806270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87108574A Expired - Lifetime EP0283550B1 (en) | 1987-03-25 | 1987-06-13 | Grinding belt |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0283550B1 (en) |
AT (1) | ATE73373T1 (en) |
DE (2) | DE8704435U1 (en) |
ES (1) | ES2030016T3 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6569004B1 (en) * | 1999-12-30 | 2003-05-27 | Lam Research | Polishing pad and method of manufacture |
EP1561543A1 (en) * | 2004-02-09 | 2005-08-10 | sia Abrasives Industries AG | Grinding belt |
EP1561544A1 (en) * | 2004-02-09 | 2005-08-10 | sia Abrasives Industries AG | Grinding belt |
EP1561545A1 (en) * | 2004-02-09 | 2005-08-10 | sia Abrasives Industries AG | Abrasive belt |
CN110977797A (en) * | 2019-12-20 | 2020-04-10 | 韶关威鸣研磨材料有限公司 | Abrasive belt interface structure and butt joint process thereof |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2445807A (en) * | 1947-06-18 | 1948-07-27 | Carborundum Co | Joint for abrasive belts or bands |
US3427765A (en) * | 1966-02-11 | 1969-02-18 | Carborundum Co | Abrasive belts and method of making same |
US3402514A (en) * | 1966-11-30 | 1968-09-24 | Abrasive Products Inc | Butt joint for flexible abrasive sheet material |
-
1987
- 1987-03-25 DE DE8704435U patent/DE8704435U1/de not_active Expired
- 1987-06-13 EP EP87108574A patent/EP0283550B1/en not_active Expired - Lifetime
- 1987-06-13 ES ES198787108574T patent/ES2030016T3/en not_active Expired - Lifetime
- 1987-06-13 AT AT87108574T patent/ATE73373T1/en not_active IP Right Cessation
- 1987-06-13 DE DE8787108574T patent/DE3777393D1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0283550A2 (en) | 1988-09-28 |
ATE73373T1 (en) | 1992-03-15 |
EP0283550A3 (en) | 1990-02-28 |
DE3777393D1 (en) | 1992-04-16 |
DE8704435U1 (en) | 1987-05-21 |
ES2030016T3 (en) | 1992-10-16 |
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