HU184752B - Method for producing buffing body of rotation of textile base - Google Patents

Abstract

FIELD OF THE INVENTION The present invention relates to a polishing rotating body of textile material. The essence of this is to cut or pick up pieces of a thickness of less than 50 mm, compacted, preferably felted or embossed in the shape of a polishing body profile, the surfaces of which are powdered at a friction temperature similar to that of the fabric, preferably a phenolic formaldehyde polycondensate modified epoxy-based resin or polyester adhesive. the adhesive treated sheets are preferably 0 to 25% by weight, preferably 5 to 8% by weight, of the abrasive material known per se, e.g. sprinkled with aluminum oxide particles, and then superimpose the shapes of the shaped or composite fabric layers over one another over a concentric corrugated pre-press plate, e.g. forming a disc or cylinder, compressing it, or curing the adhesive at the same time as the curing temperature. -1-

Description

The present invention relates to a textile polishing rotary body e.g. discs, rolls, which rotation body is made of different materials of textile, resin, e.g. Contains epoxy resin adhesive and various abrasives.

Among the known wheels for mechanical polishing and grinding of various metal surfaces - machine parts, metal objects - are among the simplest resin discs where the polishing is performed by the resin itself.

Such is disclosed in I ^ 27,786. German Patent Specification, wherein the disc contains felt fibers to hold the resin at high speed; these are elastomeric binder e.g. latex rubber, which is filled with foam plastic joints. This may be a polyurethane, phenol, silicone or epoxy resin. The disc is normally made by the users themselves, rarely contains abrasive material, in practice it can only be polished.

Essentially similar to the one shown in No. 103,186. A disc described in the GDR, comprising a binder consisting of a hard pitch and phenolic resin up to three times its size, containing felt flakes or skin particles. Its use is very economical in a very small area, usually only used by jewelers to clean silver coatings.

A disc of textile material is disclosed in U.S. Patent No. 1,677,144. German description. It consists of a series of radially arranged textile bands (called "wefts") which are individually twisted in a circle and are bent in a U-shape and are sewn together to form a disc. When sanding, polishing or applying the abrasive to the surface of the disc or by spraying the surface to be polished with the abrasive. Similar discs made entirely of felt can be used in a similar way. All of these are very difficult to use, the abrasive material will soon wear off, chafing and then have to be repeated every time.

Finally, it is also a textile material, the

No. 577,594 The disc described in the German description is composed of paper or canvas coated with a radially abrasive material, alumina, which is radially arranged from the ring around the axis of rotation and is held together by a separate adhesive on its central stub ring, delimited. Aluminum oxide particles roll out from the sides of the paper or canvas that wear out during work and can make the polishing uneven. It is expensive to produce. It can only be used for machining holes in large surface planks or larger rotary bodies.

In addition to the disadvantages mentioned above, these known polishing disks also have the common disadvantage that they can be machined only on relatively large surfaces, but not for the resin removal of surfaces of newly conquering, large-scale, industrial applications such as communications elements. They can be used.

It is therefore an object of the present invention to provide a more economical production of a polishing (csi2 soldering) disc which, without interruption of wear, performs uniformly and with the same efficiency, and which is also capable of cleaning communication elements.

The present invention is based on the discovery that felt or needle felt fabrics, which may be made from waste material, are useful for this purpose, provided that the sides of the circumferential parts of which they are formed are treated with a mass of abrasive material which is abrasive. it is destroyed proportionally, and if these textile circular sheets are corrugated to such an extent that their sides completely rotate through the inside of the rotating body during rotation.

Accordingly, the object of producing such a polishing rotary body according to the present invention is to cut or toggle pieces of compacted, preferably felted or needle-felted fabric of not more than 50 mm in thickness, preferably at a frictional temperature similar to that of the fabric. formaldehyde polycondensate modified epoxy resin or polyester adhesive; sprayed with alumina particles and then layered or formed textile pieces layered on top of each other, rotating between concentric corrugated preform plates, e.g. pressed together to form a disk or roll, and during or after pressing, curing the adhesive at a curing temperature.

In most cases, it is also necessary to provide a central mounting arrow for the cut or peeled, shaped or lumped sheets.

If the curing temperature of the adhesive is higher e.g. 120-160 ° C, it is usually heat treated in a continuous (tunnel) or batch furnace after extruding the rotor.

If, on the other hand, it is desired to make a cylinder rather than a disc, it is preferable to press the cylinder in a heated multi-stage extruder to form a corrugated surface and to heat it simultaneously.

If the curing temperature of the adhesive is low, the adhesive of the rotary body may, for example, be pressed after pressing. can cure at room temperature as well,

Finally, cylinders can be formed, especially if different abrasive layers are to be produced, such that the rotating bodies produced are e.g. the discs and / or cylinders are combined in a larger unit.

The rotary body made by the process of the invention is coated with an adhesive on the layers of oxy-allyl, and sprayed with the abrasive. By combining the layers in a corrugated fashion, the abrasive material on the periphery of the rotating body is in a wavy line and polishes the object to be polished during rotation in an appropriate distribution. Wear of the body of the rotation body

184 752 the adhesive also wears together, but the polishing lines remain the same, only the diameter of the sheath decreases.

The recommended phenolic formaldehyde polycondensate (or polyester) modified epoxy adhesive is a thermosetting resin which is completely dust-abrasive during polishing at the same temperature as the wool fiber. In its unhardened state it is insoluble in water, aliphatic alcohols, hydrocarbons, aromatic solvents. The fabric is well moistened and does not require pre-treatment to apply the adhesive. The monomeric adhesive is e.g. diluted with acetone. This controls the saturation of the layers.

The fabric is wool, generally of animal hair, preferably felted or felted, but optionally woven.

The easiest way to polish is to use a rotating polishing wheel that is moved in parallel, but it is also possible to produce a cylindrical or tapered polishing rotor as needed. For polishing printed circuits. a complex polishing roller of different polishing discs or roller parts may be required. The abrasive material itself and its amount must always be selected according to the material of the object to be polished.

The following examples illustrate the process of the invention.

Example 1

Manufacture of polishing wheels for steel alloys.

The stripped nein pieces are smeared with commercially available Redux 64 adhesive, 10-12 wt. in an oven at 140 ° C.

Example 2

Production of polishing discs for non-ferrous alloys.

Felted felts are circularly formed with polyester e.g. lubricated with commercially available Chemifor adhesive, sprayed with 3-6 gm of 20-25% by weight of silicon carbide granules, stacked in layers, crimped and cured at room temperature.

Example 3

Production of polishing cone for lacquer.

Felted pieces of felt of varying diameter according to the cone angle of the cone and the thickness of the felt are made with epoxy resin modified with polycondensate, e.g. sprayed with commercially available adhesive AW 138, sprayed with 15 weight% Zircosil (zircon silicate) having a grain size of 0-5 gm, stacked on top of each other, pressed between pressed sheets and cured in a batch oven at 110 ° C.

Example 4

Polishing roller for brushed glass mat surface.

Circular needle-tufted textile pieces alternately layered with epoxy-based adhesives, e.g. lubricated with commercially available adhesives Chemofor and AW 138, sprayed with 10-20% by weight of Rutile (TiO ₂ ), 1-3 gm, layered on top of each other and heated in a heated multi-level press with pre-pressed pre-press plates at 20-80 ° C.

Example 5

Making a polishing roller for printed circuits.

Circular felted pieces of felt are epoxy-based synthetic resins modified with phenol formaldehyde polycondensate, e.g. commercially lubricated with Redux 64 adhesive. a portion of these is sprayed with 5-15 gm of powdered screened pumice stone, and then, with the desired thickness and stripe, the non-abrasive bar coated with non-abrasive material is pressed separately between flameproof pre-extruded marshes. heat the oven at 120 ° C and then combine the two disks in a desired order with a Redux 64 adhesive to form a cylinder.

As can be seen from the examples above, various variants of the polishing rotary bodies can be prepared according to the invention. Experimental polishing discs have proven to be excellent in mechanical polishing.

Claims (6)

Patent claims 1. Procedure for polishing rotary body, e.g. discs, rolls, which rotation body is made of various materials of textile, resin, e.g. epoxy-based resin adhesive and various abrasive materials, characterized by cutting or stamping pieces of compacted, preferably felted or needle-felted fabric not more than 50 mm thick to form a surface similar to that of a textile, preferably with phenolic formaldehyde polycondensate modified epoxy resin or polyester adhesive, the sheets treated with this adhesive being 0-25% by weight, preferably 5-8% by weight; sprayed with aluminum oxide particles and then -3184 752 is a layer or composite of textile pieces which is superimposed on one another, with a rotating body between concentric corrugated pre-press plates e.g. pressed together to form a disk or roll, and at or after the pressing, press ^! curing the adhesive at a curing temperature. Second embodiment of the method as defined in claim 1, characterized in that the cut or kicsákózott, the total value ^1-joint shaped or stacked plates provided with a central mounting darter. 3. A method as claimed in claim 1 or 2, characterized in that, at a higher cure temperature of the adhesive, the rotary body is cured in a continuous (tunnel) or batch furnace after extrusion. A method as claimed in claim 1 or 2, characterized in that, in the case of a cylinder having a higher curing temperature of the adhesive, the cylinder is simultaneously corrugated and heat-treated in a heated multi-stage extruder. 5. A method as claimed in claim 1 or 2, wherein the adhesive has a low curing temperature, e.g. curing at room temperature. 6. A method of carrying out the process as defined in any one of claims 1 to 5, characterized in that the formed rotational bodies are: the discs and / or cylinders are combined in a larger unit.