EP0229983B1 - Meule anti-bruit - Google Patents

Meule anti-bruit Download PDF

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Publication number
EP0229983B1
EP0229983B1 EP86117294A EP86117294A EP0229983B1 EP 0229983 B1 EP0229983 B1 EP 0229983B1 EP 86117294 A EP86117294 A EP 86117294A EP 86117294 A EP86117294 A EP 86117294A EP 0229983 B1 EP0229983 B1 EP 0229983B1
Authority
EP
European Patent Office
Prior art keywords
layer
powder
mixture
process according
grinding
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
Application number
EP86117294A
Other languages
German (de)
English (en)
Other versions
EP0229983A3 (en
EP0229983A2 (fr
Inventor
Hans J. Dr. Dipl.-Chem. Padberg
Josef Keuler
Henning Dr. Dipl.-Ing. Brandin
Klaus H. Dr. Dipl.-Ing. Thormeier
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.)
Cerasiv GmbH Innovatives Keramik Engineering
Original Assignee
Feldmuehle 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 Feldmuehle AG filed Critical Feldmuehle AG
Priority to AT86117294T priority Critical patent/ATE47811T1/de
Publication of EP0229983A2 publication Critical patent/EP0229983A2/fr
Publication of EP0229983A3 publication Critical patent/EP0229983A3/de
Application granted granted Critical
Publication of EP0229983B1 publication Critical patent/EP0229983B1/fr
Expired 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
    • 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
    • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
    • 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
    • B24D5/12—Cut-off wheels

Definitions

  • the invention relates to a process for the production of multi-layer grinding wheels, in particular multi-layer cutting and grinding wheels for free-hand grinding, in which mixtures of abrasive grain and binder, and optionally fillers and possibly reinforcements, are introduced in layers in a mold with the interposition of at least one layer of vibration-damping materials be pressed into a blank and the blank obtained is cured.
  • Abrasive bodies which due to their structure are less prone to generate vibrations, are called sound-absorbing abrasive bodies and are known as such from DE-OS 26 10 580, DE-OS 26 32 652 and AT-B 379 100. All these proposals have in common that damping layers are arranged between the actual grinding layers, which are made of a polymer or a vibration-damping film, for. B. of nitrile rubber.
  • DE-OS 26 32 652 describes connecting at least two finished, so-called “grinding plates” with a certain diameter-thickness ratio to one another by means of a polymer layer which is at least 0.2 mm thick and at most the thickness of the "grinding plates” having.
  • the polymer which can be an adhesive, is placed in the form of a solution, a paste or in a liquid or molten state between the two "grinding plates” and then dried, hardened or solidified in order to firmly bond the two "grinding plates” together .
  • a thermoplastic resin can be used as the polymer, but plastics which can be hardened by heat treatment are preferably used.
  • DE-OS 26 10 580 also assumes that several thin grinding wheels forming the layers of abrasive material are coated with a binder, placed on top of one another and pressed. To achieve greater thicknesses of the damping layers, disks made of thermoplastic film and disks made of abrasive material can also be alternately stacked and pressed together at temperature so that the thermoplastic material bonds with the disks made of abrasive material.
  • AT-B 379 100 provides that a vibration-damping film, for. B. of nitrile rubber, is placed and pressed with the abrasive grain.
  • the grinding wheel blank thus produced is clamped between packing plates and cured in the furnace.
  • a sheet of nitrile rubber stamped to match the shape or this sheet is first laminated onto the fabric and then must be placed together with it in the press and after pressing the abrasive body blanks clamped between packing plates must be cured in the oven The process is extremely time-consuming and therefore labor-intensive.
  • the object of the present invention is therefore to demonstrate a method which ensures perfect adhesion between the abrasive and the sound-absorbing material over the entire surface of the layer and in which this sound-absorbing layer can also be applied and applied quickly and easily.
  • This object is achieved by a method for producing multi-layer grinding wheels, in particular cutting and grinding wheels for free-hand grinding, in which mixtures of abrasive grain, binder and, if appropriate, fillers and possibly reinforcements are introduced into a mold in layers with the interposition of at least one layer of vibration-damping materials are pressed into a blank and the raw material obtained is cured, with the characteristic feature that the layer or layers of vibration-damping material are introduced into the mold in the form of a fine-grained, free-flowing powder or granulate.
  • the vibration-damping material is used in powder and / or granulate form and is also fine-grained, the applied layer automatically matches the previous one and following layer in their surface structure, ie there is no free space between the individual layers after they have been pressed.
  • the powder or granulate also ensures that there is no unwanted springing after pressing the grinding wheel, since abrasive grain areas protruding from the abrasive grain layer or the reinforcement are embedded in the layer of vibration-damping material from the outset and therefore cannot press against a compact surface, which leads to Springing leads.
  • An advantageous embodiment of the invention provides that at least one elastomer is introduced as a powder or granulate, which withstands a heat load of more than 110 ° C.
  • butyl rubber for example in the form of Perbunan N, neoprene, fluoroelastomers, polyacrylates, polyurethanes, silicone rubber, polysulfite rubber and hypalon, are also suitable here. All of these elastomers have to be more or less modified to withstand the required heat load and still have the elasticity required to reduce the sound level.
  • Another advantageous possibility is to introduce a mixture of one or more synthetic resins and one or more elastomers as powder or granulate.
  • the use of a synthetic resin in connection with the rubber results in a better connection between the sound-absorbing layer and the abrasive grain, which as such is also bonded with synthetic resin.
  • the choice of synthetic resin depends on the temperature resistance first, but secondly on the compatibility with the rubber and the synthetic resin that is used as a binding agent for the abrasive grain when building the grinding wheel.
  • a phenol-formaldehyde resin can also be used as the synthetic resin for the damping layer.
  • the use of other thermosets, such as. B. melamine resin, urea resins and polyester resins are conceivable.
  • Epoxy resin is particularly suitable because of its high strength and the good connection to the phenolic resins and the rubber.
  • a preferred embodiment of the invention provides that an epoxy resin is mixed with a nitrile rubber in a ratio of 10:90 to 70:30.
  • the optimal range for sound absorption and grinding performance is when 15 to 25% epoxy resin is added to the nitrile rubber.
  • the handling of the sound-absorbing material is a particular difficulty in the manufacture of the sound-absorbing grinding wheels. More or less all materials which are easy to use have a high level of stickiness and are therefore not free-flowing. Stickiness is to be understood as meaning that the individual particles accumulate to form larger agglomerates, ie the material is of inhomogeneous consistency, and agglomerations form, which results in an uneven distribution when pressed lung leads. This also makes the finished grinding wheel inhomogeneous. In addition, the material adheres to the slides of the press.
  • the homogeneous mixture obtained in this way is tack-free and therefore easy to incorporate into the mold.
  • An advantageous embodiment of the invention therefore provides that the mixture is brought to a granulate size of 50 to 2,000 1 1m in a granulator with the addition of filler.
  • the granulation is simplified by the addition of the filler, at the same time the stickiness is reduced so much that a free-flowing granulate results.
  • the size of the granulate is important for the flowability, on the other hand it represents a requirement which depends on the grain size of the abrasive grains required for the grinding wheel. So you will always try to use a finer granulate than the abrasive grain used for the grinding wheel in order to achieve the densest possible packing and thus a good connection between the abrasive grain and the damping layer.
  • inorganic filler such as MgO, ZnO, talc or marble powder is added to the mixture. All of these fillers reduce the stickiness considerably, without this hindering the reactions when the grinding wheel hardens.
  • Another advantageous embodiment of the invention provides that a mixture of cork powder and synthetic resin is introduced as powder or granulate.
  • the cork flour expediently has a grain size that is between 50 and 1,000 ⁇ m
  • epoxy resin is expediently used as the synthetic resin. The invention is explained below using examples.
  • 300 g of the resol 433 were added to 7,780 g of the corundum mixture and mixed in a planetary stirrer for five minutes. The wetted grain was then mixed with 400 g pyrite and 400 g cryolite and 1120 g novolak 227. Resulting agglomerates and agglomerations were screened off. 300 g of the homogeneous, free-flowing grinding wheel mixture obtained in this way were evenly distributed in a press mold, and in addition two external and one internal fabric reinforcement were introduced. The mixture was pressed into disks with an outside diameter of 178 mm, a bore diameter of 22 mm and a disk thickness of 88 mm.
  • the blank obtained was stacked with several other blanks of the same type and cured according to a temperature curve customary for phenolic resins, ie heating up to 90 ° C. in four hours; Heating up to 120 ° C in three hours, holding time at 120 ° C five hours, heating up to 180 degrees in three hours, holding time at 180 ° C two hours, then cooling to room temperature.
  • a temperature curve customary for phenolic resins ie heating up to 90 ° C. in four hours; Heating up to 120 ° C in three hours, holding time at 120 ° C five hours, heating up to 180 degrees in three hours, holding time at 180 ° C two hours, then cooling to room temperature.
  • an electrical corundum of grain 30 was used as the abrasive grain, which is ceramic coated, i. H. that the surface of the grain is partially coated with silicates to improve the adhesion with the binder.
  • the formulation of the grinding wheel mixture and its production correspond to example 1.
  • the grinding wheel consists of three grinding layers, two damping layers and three fabric reinforcements. 270 g of grinding wheel mixture were divided into three layers, so that 90 g were used per layer. 40 g of damping material were introduced as the damping layer, which were divided into two layers of 20 g each. The layers were alternately filled into the mold, with the grinding wheel mixture as the lowest, and a fabric reinforcement was inserted over the damping layers. The blank pressed to nominal size was cured as in Example 1, the thickness of the damping layer after curing averaged 1.3 mm.
  • a nitrile rubber which is commercially available under the name Hycar
  • Hycar an epoxy resin, commercially available under the name Araldit
  • MgO magnesium oxide
  • 790 g of Hycar resin, 200 g of araldite and 10 g of MgO were stirred for five minutes in a planetary stirrer, the MgO addition improving the processability of the mixture, i. H. avoiding caking and lump formation.
  • the powder obtained had an average diameter of 100 ⁇ m.
  • the formulation and manufacture of the noise-dampened grinding wheel corresponds to Example 3 with the exception of the damping layer.
  • the damping layer consisted of 41.7% by weight of cork powder with an average diameter of 250 ⁇ m, 16.6% by weight of a wetting agent, commercially available under SZ 449 ( Bakelite) and 41.7% by weight epoxy resin, commercially available under SB 330 (Bakelite). 417 g of cork flour were mixed with 166 g of humidifier SZ 449 for five minutes. The moistened cork flour was then mixed with 417 g of epoxy resin powder SP 330 and stirred for a further five minutes.
  • the formulation of the grinding layer corresponds to example 2.
  • the formulation of the damping layer corresponds to example 3. Two damping layers were introduced.
  • the formulation of the abrasive layer and the position of the fabric reinforcement correspond to Example 2, but an additional damping layer, the thickness of which was 2.5 mm, was introduced before the middle fabric reinforcement was inserted.
  • the formulation of the grinding wheel mixture corresponds to example 2, the formulation of the damping layer to example 3.
  • the damping layers were arranged on the outer layers directly behind the fabric reinforcements, so that they included the grinding wheel mixture.
  • Example 6 Corresponds to Example 6, but a mixture of 10% by weight of epoxy resin and 90% by weight of nitrile rubber was used as the damping layer material.
  • Example 6 Corresponds to Example 6, but a mixture of 30% by weight epoxy resin and 70% by weight nitrile rubber was used as the damping layer material.
  • the disks manufactured according to the aforementioned nine examples were subjected to a grinding test together with a commercially available disk in accordance with AT-AS 46 15/82 (example 10 in Table 2). It was ground with an angle grinder from Bosch, type 060 1331, the sound level was measured in front of a closed grinding cabin at a distance of 2 m from the workpiece. The intrinsic noise of the angle grinder was 67 dBA. A device from Rhode and Schwarz EL-DO 4, measuring range 16 Hz to 16 KHz using an A filter was used as the measuring device. A tube made of St 35 with a diameter of 191 mm and a wall thickness of 17 mm was ground. The grinding time was 10 minutes.
  • a grinding wheel 1 consists of several layers which are successively inserted into the hollow shape of the press during the production process.
  • a fabric reinforcement 5 is applied to the annular flange 3 according to the two figures mentioned, to which the abrasive layer made of abrasive grain 6, which is coated with binder 7, is then applied by means of a slide. Over this layer, the vibration-damping material is applied in the form of a powder, which forms the damping layer 8 after the fully pressed pane has hardened.
  • a further fabric reinforcement 5 is placed on the powder made of vibration-damping material, then a second layer of abrasive grain 6 coated with binder 7 is applied, and a third fabric reinforcement 5 is placed over it as a finish. The layer structure achieved in this way is pressed to the desired dimension and then cured as described.
  • FIGS. 3 and 4 show the structure of a grinding wheel with two damping layers 8 and three fabric reinforcements 5, the fabric reinforcement 5 being arranged both outside and in the middle of the flexible disk 1 '.
  • FIGS. 5 and 6 differ from FIGS. 1 and 2 in that the damping layer 8 continues to consist of individual particles, namely cork particles 4 coated with synthetic resin 4 ′, even after the pressing and curing.
  • the other structure of this disk 1 "is identical to that according to Figure 1 or 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Laminated Bodies (AREA)
  • Measurement Of Force In General (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Walking Sticks, Umbrellas, And Fans (AREA)
  • Steering Controls (AREA)

Claims (8)

1. Procédé de fabrication de meules-disques multicouches, notamment de meules multicouches pour dégrossir et tronçonner par meulage manuel, dans lequel des mélanges de grains abrasifs, de liants ainsi qu'éventuellement de charges et éventuellement armatures, sont introduits en couches dans un moule, avec interposition d'au moins une couche de matières amortissant les vibrations, et comprimés pour former une ébauche, et l'ébauche obtenue est durcie, caractérisé par le fait que la ou les couches de matière amortissant les vibrations sont introduites dans le moule sous la forme d'une poudre et/ou d'un granulat fluide à grain fin.
2. Procédé selon revendication 1, caractérisé par le fait que l'on introduit, en tant que poudre ou granulat, au moins un élastomère résistant à une charge thermique supérieure à 110°C.
3. Procédé selon revendication 1, caractérisé par le fait que l'on introduit, en tant que poudre ou granulat, un mélange de résine synthétique et de poudre de liège.
4. Procédé selon revendication 1, caractérisé par le fait que l'on introduit, en tant que poudre ou granulat, un mélange d'une ou plusieurs résines synthétiques et d'un ou plusieurs élastomères.
5. Procédé selon revendication 4, caractérisé par le fait que l'on mélange une résine époxyde à un caoutchouc nitrile, dans un rapport quantitatif de 10:90 à 70:30.
6. Procédé selon l'une des revendications 4 ou 5, caractérisé par le fait que le mélange est homogénéisé en présence d'un apport de charges.
7. Procédé selon l'une des revendications 4 ou 5, caractérisé par le fait que le mélange est amené dans un granulateur, en présence d'un apport de charges, sous la forme d'un granulat ayant une grosseur de grain de 50 à 2000 m.
8. Procédé selon l'une des revendications 4 à 7, caractérisé par le fait que des charges minérales, par exemple MgO, ZnO, talc ou poudre de marbre, sont ajoutées au mélange, dans une proportion allant jusqu'à 5%.
EP86117294A 1985-12-20 1986-12-11 Meule anti-bruit Expired EP0229983B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117294T ATE47811T1 (de) 1985-12-20 1986-12-11 Schleifscheibe mit daempfung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3545308 1985-12-20
DE19853545308 DE3545308A1 (de) 1985-12-20 1985-12-20 Schleifscheibe mit daempfung

Publications (3)

Publication Number Publication Date
EP0229983A2 EP0229983A2 (fr) 1987-07-29
EP0229983A3 EP0229983A3 (en) 1987-12-09
EP0229983B1 true EP0229983B1 (fr) 1989-11-08

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EP86117294A Expired EP0229983B1 (fr) 1985-12-20 1986-12-11 Meule anti-bruit

Country Status (11)

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US (1) US5092082A (fr)
EP (1) EP0229983B1 (fr)
JP (1) JPH07108511B2 (fr)
AT (1) ATE47811T1 (fr)
CA (1) CA1321884C (fr)
DE (2) DE3545308A1 (fr)
DK (1) DK167856B1 (fr)
ES (1) ES2012341B3 (fr)
FI (1) FI82064C (fr)
GR (1) GR3000247T3 (fr)
NO (1) NO160978C (fr)

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SE401472B (sv) * 1975-07-23 1978-05-16 Slipmaterial Naxos Ab Slipskiva bestaende av tva eller flera hopfogade slipelement
DE2610580A1 (de) * 1976-03-13 1977-09-22 Raschke Hans Dieter Dipl Ing Schleifkoerper fuer rotierenden antrieb
DE2825576C3 (de) * 1978-06-10 1981-10-29 Burka-Kosmos GmbH Schleifscheiben und Präzisionsschleifstifte, 6000 Frankfurt Verfahren zum Auskleiden der Bohrung einer großen Schleifscheibe
JPS5531520A (en) * 1978-08-19 1980-03-05 Yozo Shimizu Device for manufacturing rotary grindstone
JPS57151308A (en) * 1981-03-16 1982-09-18 Showa Electric Wire & Cable Co Ltd Production of molded article of polyimide resin
AT379100B (de) * 1982-12-21 1985-11-11 Swarovski Tyrolit Schleif Verfahren zur herstellung einer schleifscheibe

Also Published As

Publication number Publication date
NO865193L (no) 1987-06-22
ES2012341B3 (es) 1990-03-16
DE3545308A1 (de) 1987-06-25
EP0229983A3 (en) 1987-12-09
DE3666786D1 (en) 1989-12-14
DK614586A (da) 1987-06-21
JPS62157777A (ja) 1987-07-13
NO160978C (no) 1989-06-21
US5092082A (en) 1992-03-03
FI865170A (fi) 1987-06-21
NO160978B (no) 1989-03-13
DK614586D0 (da) 1986-12-18
JPH07108511B2 (ja) 1995-11-22
NO865193D0 (no) 1986-12-19
DK167856B1 (da) 1993-12-27
GR3000247T3 (en) 1991-03-15
FI865170A0 (fi) 1986-12-17
EP0229983A2 (fr) 1987-07-29
ATE47811T1 (de) 1989-11-15
CA1321884C (fr) 1993-09-07
FI82064B (fi) 1990-09-28
FI82064C (fi) 1991-01-10

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