CS267059B1 - A method of processing utility objects - Google Patents

Abstract

The optimal bond between the working tool and the processed utility object, while simultaneously reducing the consumption of polishing and abrasive, is represented by the method of processing with a wheel based on a polyurethane elastomer of cellular structure with a pore size of 1+0.3 mm, with a bulk density of 300 to 800 kg/m3, a hardness of 10 to 25 °Sh (D), in the presence of a dispersion system of a carrier liquid and a solid polishing or abrasive with a particle size of 5 to 1,000 μm, in an amount of 10 to 25 g/dm2, at a contact force of 50 to 500 kPa, a time of 20 to 130 s and a peripheral speed of the polishing surface of the wheel of 4 to 40 m/s.

Description

2 CS 267 059 Bl

BACKGROUND OF THE INVENTION The present invention relates to the processing of utility articles by the use of a particular kind of polishing discs in addition to the essential conditions for obtaining the desired quality of the workpieces to be machined.

Finishing of utility objects in terms of aesthetic and / or functional glass, ceramic or metal products is most often carried out on polishing materials in shapers or pads in combination with polishing agents such as corundum, oxidic oxide, pumice, silica, boron carbide, kaolin, chalk and the like. Abrasive polishing discs based on natural materials, such as cork, poplar wood are dependent on the availability of natural matter, discs made of plastic are usually made by impregnating various natural and artificial fabrics with polymeric resins, eg thermoreactive acrylate dispersion in the presence of a polyelectrolytic thickener (AO 184 631 ), a solution of a polyurethane or polyurethane urea elastomer in dimethylformamide (AO 154 940), an aqueous polyurethane urea gel (hydrogel) (Ger. Offen. 3 151 925) or a coumarin-rubber resin (USSR 1,024,251 A). With these abrasive masses, it is not possible to ensure the homogeneity of the material in its entire thickness, resulting in different surface and center efficiency of the disc when used due to the low porosity of the material, the surface is quickly clogged with dust from the cut, which reduces work performance.

Podlá čs. AO 242 544 is a polishing disc based on a polyurethane elastomer of a cell structure prepared from a prepolymer having a content of 4.2 to 18.3, preferably 5.2 to 15.1 wt. % of free NCO groups and 1,4-butanediol crosslinker in the presence of excipients, by activating and stabilizing.

When working with utility materials by new materials, optimum working conditions were sought, which would provide more effective conditions for the operation of the polishing material used, the type of polishing abrasive, the size of their particles, the type of polishing material, due to the polishing materials used to date, such as cork, poplar wood. the workpiece and at the same time achieve a higher quality of the machined surface.

The above drawbacks are eliminated by the method of processing utility objects by causing the moving rolls to be treated in the presence of dispersing systems, the principle of which is to use a disc based on a polyurethane elastomer of cellular structure with a pore size of 1 + 0.3 mm, with a volume a weight of 300 to 800 kg / m, a hardness of 10 to 25 ° Sh (D) in the presence of a carrier liquid and solid polishing agent 2 and a abrasive of 5 to 1000 µm, in an amount of 10 to 25 g / dm; the object is pressed with a force of 50 to 500 kPa for 20 to 130 s at a circumference of the polishing surface of the disc of 4 to 40 m / s.

In particular, the advantages of the process according to the invention include the fact that, when working with the known substances, the resulting system, the polishing material with pre-selected physical-chemical properties, the choice of abrasive, the size of the particles and other working conditions, make it possible to establish an optimal bond between the working tool. At the same time, the polished and abrasive consumptions were reduced compared to other processes.

At the same time, a better working hygiene has been achieved by the process according to the invention, which has resulted in an increase in work performance of at least 5% as well as on the health of workers.

For the surface treatment of utility articles according to the present invention, the polyurethane area, in particular the slightly foamed polyurethane elastomers, is used. The shape of the mold is determined by the mold used and depends on the method of processing, the product being processed and also the machinery. As a rule, the mass is prepared in the form of discs, e.g. in the diameter of 200 to 600 mm and the ridges of 20 to 60 mm. The rolls prepared from the described material are fastened with ball machines of various types such as older types Dry - Jouza - Pin, or new typesKNK, BS 4-56 at circumferential speed of blades of 5 to 40 m. The role of the roll is the non-polishing material - the suspension and the friction on the machined object achieve polishing

Claims (3)

Method of processing utility objects by the action of moving discs on the object to be treated in the presence of dispersion systems, characterized in that it is applied by a disc based on polyurethane elastomer of cellular structure with pore size 1 + 0.3 mm, with bulk density 300 to 800 kg / m ³ , hardness 10 to 25 ° Sh (D) in the presence of a dispersion system of a carrier liquid and a solid polishing or abrasive with a particle size of 5 to 2 1,000 [mu] m, in an amount of 10 to 26 g / dm, the workpiece being pressed with a force of 50 to 500 kPa for 20 to 130 s at a circumferential speed of the polishing surface of the wheel of 4 to 40 m / s.