SU880737A1 - Method of manufacturing abrasive wheels - Google Patents

Description

(54) WAY OF MANUFACTURING ABRASIVE CIRCLES

I

The invention relates to the manufacture of abrasive wheels and can be used for the production of high-power and high-speed grinding wheels on an organic bond using hot-pressing technology for surface treatment of casting and rolling.

The closest technical solution is a method of making abrasive wheels, including filling the fine-grained abrasive mass into the central part of the mold, filling the coarse-grained abrasive mass into the peripheral part of the mold and pressing them together.

However, the resulting abrasive wheels have an imbalance due to the piling of the fine-grained part to the coarse-grained after removing the separating mandrel, as well as violation of the boundary of the parts, resulting in the movement of the fine-grained mass in the radial direction from the center of the mold. Since the density of the fine-grained and coarse-grained portions varies due to different recipes, the density in the diametral

a section of the circle and an unbalanced mass arises, leading to a decrease in mechanical strength and an increase in the level of vibrations during the operation of the circles.

The purpose of the invention is to obtain equal 5 dense articles of abrasive circles having a fine-grained central part.

The goal is achieved by the fact that in the method of making abrasive wheels, including filling the fine-grained abrasive mass into the central part of the press, 10, filling the coarse-grained abrasive mass into the peripheral part of the mold and pressing them together, pressing the coarse-grained mass into the peripheral part of the mold. compacting abrasive abrasive mass in the central part, and after filling the peripheral part of the mold with a coarse abrasive mass, pressing is done after it.

FIG. 1 shows the formation of fine-grained central part; in fig. 2 - repressing the billet fine-grained central part; on fng. 3 - forming a coarse peripheral part.

The molding of the fine-grained central part is carried out as follows.

The mounting plate 1 makes it possible to fix the lowering of the lower disk 2 of the mold of the outer ring 3 and the core 4 in the axial direction. A centering ring 5 is inserted into the ring 3 along a sliding fit, which has a tapered inner bore tapering upwards. In the space between the core 4 and the centering ring 5, the fine-grained abrasive mass is filled and leveled. A punch 6 is then inserted, with its internal bore, on a sliding fit on the core 4 of the centering ring 5. It is then pressed with a reinforcement of 50-60 tons through the mandrel 7.

After pressing, the installation plate 1, the lower disk 2 and the outer ring 3 are removed. The core 4 with a fine-grained abrasive mass, centering ring 5 and punch 6 is left and then pressed onto the depressor ring.

The remaining core with the billet of the central fine-grained part is again mounted on the installation plate i and the lower disk of the mold 2, on which the reinforcing fiberglass is pre-laid. A core 6 is placed on the preform of the central fine-grained part, and when the ring 3 is mounted, the coarse-grained abrasive mass is poured and leveled. A coarse-grained peripheral mass is formed through the centering ring 5, then the second reinforcing glass mesh is laid, installed. The upper mold disk is cast and co-cold forming is performed.

The application of the proposed method of forming an abrasive mass with a fine-grained central part allows obtaining an equally abrasive tool by hot pressing.

Claims (1)

Invention Formula A method of making abrasive wheels, including filling the fine-grained abrasive mass into the central part of the mold, filling the coarse-grained abrasive mass into the peripheral part of the mold and co-pressing them, characterized by abrasive mass prepares fine abrasive mass in the central part, and after filling the peripheral part of the mold with a coarse abrasive mass roizvod tons last degassing. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 514684, cl. B 24 D 3/00. Rfig. H 0.5 i.