DE1037913B - Polishing, grinding or contact disc and method for making the same - Google Patents

Description

Polishing, grinding or contact disc. and method of manufacture The same The invention relates to one for polishing, grinding or as a contact disk disc that can be used for guiding sanding belts and consists of closely spaced, radially directed individual fibers twisted into a strand, passing through a central Centering ring pulled through in the shape of a hairpin and each through a face-side tissue disc are covered.

Such polishing disks, referred to as fiber strand disks, are per se already known. The production of the same causes considerable difficulties, there is one against the centrifugal force of the high-speed driven disks reliable, resilient storage of the fiber strands in the association of the disc body difficult to achieve. In particular, it prepares to manufacture harder, so dense disks with resistant radially directed fiber strands difficulties. In a known embodiment of such fiber strand disks, their formation is made so that one of the fiber strands is longer, ring-shaped at the apex is bulged and placed around a centering mandrel. From the further required and U-shaped fiber strand sections bent into loops are branched off thin partial strands, which overlap the annular bulge of a fiber strand, so that a a certain cohesion is created. The so from a single or multiple situation The disc composed of strands is then provided with lateral cover discs Made of woven fabric, which are joined to the strand layers by stitching. Since the Ring bulge is neither rigid nor load-bearing, is a tensile, radial hold the fiber strands cannot be achieved; the strands can move at high speed and rigid stress relocate or even be torn out. Also is making these disks quite cumbersome and time consuming, and it is not possible to achieve a product that is uniform in structure.

In the case of polishing brush discs, the bristles of which are made of radially directed, synthetic, Fibers that are not twisted into strands are formed, a tensile strength radial is achieved Hold the bristles in a known manner by folding the latter in a U-shape and be stored on a support body consisting of a coiled wire.

For the annular support of the wire helix here is a the latter uses inlaid wire, the ends of which are connected to one another. These Polishing brushes are loose and soft and only have a weak grinding or grinding Polishing effect; they are produced in such a way that the coiled carrier wire is attached in the extended position to the side of a winding mandrel and the Plastic filaments forming bristles in tufts between the helical turns on the winding mandrel is wound, the space between two turns being filled in each case will.

After removing the mandrel, the stretched position becomes the brush body is bent into an annular shape, and its ends are by means of a Binding wire connected together. After pressing flat and after clamping into a Holding hub then the bristle coils are cut open and dressed; the The polishing brush is only then ready for use. Apart from the cumbersome production in elongated form, which disadvantageously reduces the tightness of the fibers on the Disk periphery is significantly reduced, is such a production with fiber strands, z. B. from sisal straw or the like .. not possible.

The invention is based on the task of providing a dense, circumferential, uniform storage of z. B. from sisal straw fiber strands existing polishing or. To create grinding wheel, with which a safe centering even with high numbers of revolutions and retention of the fiber strands is achieved and also by a simple, manageable production can be generated.

For this purpose, according to the invention, the centering ring consists of two concentric single rings connected to one another by radial struts which the fiber strands are drawn through alternately. As a result of this training one can, alternately offset, the hairpin-shaped curved strands with their Place vertices around one or the other single ring, creating an even Perimeter division and consequently a tight fit is achieved.

This makes the use of fiber strands made of hard fibers, z. B. sisal, allows and a disc with tight, tightly lying against each other Strands created. Such disks can be used with advantage for grinding and polishing Stainless steels or the like can be used, with high stress occurring. In spite of this, the loosening and flying out of fiber strands is due to the powerful Suspension of the fiber strands on the inner supporting metal centering ring and avoided due to their tight storage on the circumference of the disc.

In order to ensure a uniform and simple production of the inventive with taut, tightly attached strands provided with grinding and polishing discs to enable, according to the invention, a method is used in which under Use of a diameter of the disc and on the centering rings A fiber strand corresponding to the outer auxiliary ring held by means of removable spokes Length is wrapped inside through the individual rings and outside over the auxiliary ring, the The spokes are gradually removed as the fiber strand continues to be wound, then the fiber strand disk with textile disks on the front side is quilted and the fiber strand apexes lying on the circumference of the disc for removing the outer one Auxiliary ring are cut and then dressed the circumference of the disc will.

In the case of fiber strands wound in this way, advantageously the disc can be quilted as long as the auxiliary ring is still integrated and the Disc body has its centric circumferential shape.

In the drawing, the inventive polishing, grinding and contact disk illustrated in one embodiment and also the manufacturing method the same shown schematically. It shows Fig. 1 a side view of the finished Disk, Fig. 2 a perspective view of a disk part, Fig. 3 the centering ring, Fig. 4 the auxiliary ring with the centering ring clamped in, Fig. 5 the one used for clamping Spokes in side view, Fig.6 the beginning of the windings of the fiber strand, Fig.7 a cross-section of the bearing achieved here, Fig.8 schematically the finished wound Fiberglass washer, Fig. 9 a two-sided cover made of textile material, Fig. 10 their formation in cross section, Fig. 11 the same in the turned state, Fig. 12 the finished quilted disc and Fig. 13 the cutting open of the circumference of the strand layers.

The polishing or grinding or contact disk shown in Fig. 1 consists of tightly opposed, radially directed fiber strands that are connected to one another on the disc side surfaces.

As can be seen in Fig. 2, they are wound according to the scheme in Fig. 7 Fiber strands 1 'or 1 "directed radially, run approximately parallel, but offset to each other, and end on the peripheral surface of the disc in flat cut surfaces 2, 2 '. The textile fabric disks 3 or 3 covering the strands on the side surfaces. 4 extend to these cut surfaces 2, 2 'and are sufficient by a Number of concentric stitching seams 5 connected to one another.

The middle disk opening 6 is also made of the textile disks with lined. The round shape of the disc and the disc opening is through the centering rings 7, 7 'obtained, the latter, as Fig. 3 shows, by radial struts 8 are connected to each other.

Proceed as follows to produce these disks as described: A centering ring pair 7, 7 '(Fig. 3) is first by means of the spokes 9 in a Auxiliary ring 10 installed. The auxiliary ring 10 is of flat cross section and has on its peripheral edge a series of holes 11, each of which is spaced on it approximately one strand thickness are provided. In this you can make it easier to keep your distance pins are used when winding. A fiber strand 1 is now arbitrary Length continuously (Fig. 6) in closely spaced layers 1 'or 1 "on the Centering ring 7 or 7 'and auxiliary ring 10 wound. Here are preferably each the vertices of the hairpin-shaped curved strands alternately once around the ring 7, next time bent into the ring 7 '.

As soon as a sector of the rings is fully wound, the relevant Retaining spoke 9 removed so that the strand winding is already wearing the centering rings. If the disc is fully wound according to the scheme in Fig. 8, then Both sides of the pane are covered by a textile fabric cover made up of two disc-shaped ones Blanks 11, 12, which are united at the edge of the hole 13 by means of a seam 14 (Fig. 9, 10). These tissue slices are turned (Fig.11) and on the Fiber strand disc applied. This is followed by quilting several times the concentric stitching 5.

The lying over the peripheral edge of the auxiliary ring 10 heads 1 "'of the Fiber strands are exposed. These are now shown in Fig. 13 up to the circumference 15 of the Auxiliary ring 10 cut open and the auxiliary ring 10 removed. By circular cutting the circumference of the fiber strand disk is then the polishing or grinding disk completed.

Claims (2)

PATENT CLAIM: 1. Polishing, grinding or contact disc made of dense adjacent, radially directed, individual fiber strands passing through a middle centering ring drawn through in the shape of a hairpin and one out each Textile material existing front disk covered and together with the textile disks are quilted, characterized in that the centering ring consists of two concentric, individual rings (T, 7 ") connected to one another by radial struts (8) which the fiber strands (1, 1 ") are drawn through alternately. 2. Method of manufacture the disc according to claim 1, characterized in that using a determining the diameter of the disc and on the centering rings (7, 7 ') by means of removable spokes (9) held outer auxiliary ring (10) a fiber strand (1) corresponding length inside through the individual rings (7, 7 ') and outside via the auxiliary ring (10) wrapped becomes, the spokes (9) as the winding progresses of the fiber strand (1) is gradually removed, then the one with the textile discs on the front occupied fiber strand disc quilted and those lying on the circumference of the disc Fiber strand apex (1 "') cut open to remove the outer auxiliary ring and then the circumference of the disc is dressed. Considered Publications: German Patent No. 420 791; U.S. Patent No. 2,267 850, 2 090 814.