SI9600276A - Abrasive cutting and grinding disk - Google Patents

Abstract

An abrasive cutting and grinding disk containing resin binder and reinforced with glass fibre fabric, where a part of the applied abrasive is in the form of fragments obtained from the cold processing of rests of resin-bonded grinding wheels according to a dry mechanical process comprising crushing, sieving and winnowing is solving the ecological problem of waste resin-bonded grinding wheels in a simple, low-cost and effective way. In the same time, a cutting and grinding resin-bonded disk of improved properties is obtained showing lower density, more elastic structure and higher grinding efficiency.

Description

Abrasive cutting blade

The subject of the invention is a thin-walled abrasive cutting disc disc in a resin binder, reinforced with fiberglass twists, in which a lump-shaped abrasive is embedded.

The invention addresses the technical problems of products in the field of the abrasive industry, namely from the type of cutting, resin bonded program.

A technical problem solved by the invention is the composition and fabrication of a cutting grinding, resin-bonded plate that will be specifically lighter and have greater abrasive effects than has been done so far; its production will also solve the ecological problem of waste resin-bound grinding wheels. This will be achieved by the incorporation of a lump-shaped abrasive, which will be obtained from the reprocessing of resin-bound abrasives.

Both the shape and composition and the manufacturing process of the cutting-edge, resin-bound plywood produced so far have been known for decades and have not changed significantly. Only processes for the processing of waste resin-bonded abrasives have emerged until recently; associated with greater ecological awareness.

The abrasive, cutting grinding wheels produced so far consist essentially of an abrasive shredder of corundum and silicon carbide, mineral powder fillers, and fiberglass dash.

The whole is poured and glued in a bakelite-resin bond, pressed in a disc-shaped mold, and baked in an oven at

Oh

180 C. We distinguish them by:

- intended use (for metals and non-metals),

- shape (straight, for cutting and convex, for grinding),

- sizes (larger or smaller diameter and thinner or thicker panel),

- the mode of use (on manual or stable machines).

There are a number of known solutions for waste processing of resin-bonded abrasives so far, namely:

- Ordinary incineration of resin bonded abrasives, where the binder resin burns and abrasive grains and residual glass fibers and fillers remain. The abrasive grains thus obtained can also be used to re-incorporate resin-bound grinders. The grains harvested are usually highly contaminated - coated with precipitated fillers and soot. Therefore, they are used only in lower quality products. The process is inexpensive, but ecologically inadequate.

- Chemical wet process for the decomposition of resin-bound abrasives using sulfuric acid. This process produces an abrasive in the pure form of the basic granularity, but it is expensive and environmentally-water intensive.

- Pyrohydrolytic decomposition process of resin-bound grinders by means of superheated steam. A patent application has been filed for this procedure. In this case, we have obtained the cleanest regenerated abrasive ever used for re-embedding into grinders. The process is technologically very sophisticated. It is, however, professionally demanding and dangerous in the event of a failure, since hydrogen may also appear in the closed process. Therefore, the procedure is expensive and has not worked in practice.

These recycling processes are characterized by the fact that they are used to obtain an abrasive for re-embedding back into grinders, and at the same time to solve the environmental problem of the environment, which otherwise occurs when these residues of resin-bound grinding wheels are deposited in open landfills e.

-: -3-The characteristic of cutting, resin bonded panels is that the cutting effect of the boards increases in proportion to the increase in the circumferential speed of the board. This, in turn, increases the centrifugal breaking force, which also depends on the weight of the abrasive, or its specific weights.

From these characteristics and lessons, there is a constant developmental tendency to produce such grinding resin-bound plywood products that will be safer and better cut, respectively. sanded and will not burden the environment.

In the most simple, inexpensive and effective way so far, the invention solves these development trends.

According to the invention, it will be possible to make a cutting grinding, resin plywood board, which will be lighter, therefore cheaper, safer and will be better cut or cut. grinders.

The invention will be described in the following embodiments:

1. Grind the remains of sintered cutting discs and discs into lumps, respectively. in the shape and size and purity of the abrasive suitable for re-embedding in cutting, resin-abrasive discs. These panels have an average of 200 kg / cm of breaking strength. When crushing the plates, they break and break in the weakest places - the seams, so we get lumps that have a higher average breaking strength than the plates from which these lumps were obtained. Therefore, when reinstalling these lumps in the cutting blade, products with an average higher breaking strength are obtained.

2. When reinstalling the abrasive lumps, they should be resinized with fresh resin. In this way, more bonding resin is introduced into the newly made cutting blade plate according to the invention, as was the case with the original classical production of the cutting blade.

This gives products with a lower specific gravity and at the same time increased elasticity and reduced plate hardness.

Claims (2)

PATENT APPLICATION 1. A method of manufacturing an abrasive cutting disc disc§ in a resin-bakelite binder and reinforced with fiberglass twists, characterized in that a part of the abrasive in the form of lumps obtained from the residues of the bakelite-bound plates is embedded in the process according to this method. In the process of preparation of the mixture, we first grind the abrasive out of the lumps and then proceed with the addition of other components in accordance with the known procedure, thus obtaining a more elastic structure, with better abrasive effects, while reducing the weight of the product. 2. A process for processing abrasive disc residues in a resinous bakelite binder, reinforced with fiberglass or without reinforcement, characterized in that, by a dry mechanical process, by grinding, sieving and winding, resin-bound abrasive discs are obtained Higher strength than the plate from which such an abrasive was produced, and lower bulk weight and firmer resin bonding than is achieved by using only a classic abrasive. ABSTRACT Abrasive resin abrasive cutting board, reinforced with fiberglass twists and with one piece of abrasive in the form of lumps, obtained by cold processing of resin-bound abrasive abrasives, by mechanical crushing, sieving and winding, easily, cost-effectively and efficiently solves the environmental problem of resin-bound grinding wheels. At the same time, we obtain a cutting resin grinding wheel for better properties, namely smaller specific ones, more elastic structures and higher abrasive effects.