SU850368A1 - Abrasive tool making method - Google Patents

Description

The invention relates to the production of 1x160 round wheels and other abrasive tools on bakelite bond. There is a known method for producing an abrasive tool, in which the abrasive material is coated with a silicone compound containing functional polysiloxane groups. An aqueous solution or suspension of the organosilicon compound is taken, applied to the surface of the abrasive material and dried, removing the solvent. Subsequently, the coated material (in the form of grains) is used in the manufacture of abrasive tools using conventional technology. The disadvantage of this method is the need to pre-treat the abrasive material with an organosilicon compound, which consists in preparing an aqueous solution of the organosilicon compound, applying this solution on the surface of the abrasive grains and drying the material, which entails a significant increase in the overall labor intensity of the manufacture of an abrasive tool. A method of manufacturing an abrasive tool is also known, in which a silicone compound of the aminoalkyltriethoxysilane type is mixed with liquid bakelite until uniform. The mixture is then applied to the grinding material without any heat treatment. Pulverbakelite and filler are added to the moistened grain, all mixed, molded and thermoablative 21. This method reduces the laboriousness of the tool, but the physicomechanical properties of abrasive products obtained by this method , lower than that of abrasive products, obtained by the method of pre-processing grain organosilicon compound. 3 The purpose of the invention is to increase the bone content of an abrasive tool on a bakelite bond by increasing its strength and water resistance without substantially changing the labor intensity of manufacturing. The goal is achieved by preheating a humidifier, in particular a liquid bakelite, to a temperature of 40-6 CP. The organosilicon compound is injected into the heated liquid bakelite, mixed thoroughly and the grinding material is moistened with the mixture. Then pulverbakelite is added to the moistened grinding material and the filler is mixed. The resulting mass is molded and thermally processed to a thermoset. Silicone coagulation can first be introduced into liquid bakelite, mixed, and then the resulting mixture heated to 40-60 C. It is established that heating over 6 (Yas is inexpedient, since it leads to an increase in the viscosity of the liquid bacterite, which does not allow evenly Moisturize pshifovalny material. A positive effect - increasing the strength and water resistance of the tool - is achieved due to the fact that when the humidifier is at a higher temperature, the conditions for precipitation of mol of silicon organics onto the surface of the shell are improved. About material. Example 1. Liquid Bakelite of the BZh-3 brand (2.1 wt.%) is loaded into a container and heated to a temperature of 40. Then 0.5% by weight of an AGM-9 organo-silicon compound is fed into the container and everything is thoroughly mixed. The resulting mixture is poured into a mixer, into which 84.4% by weight of grinding material grade 14A25H is loaded, and peremepgavat.Then 9% by weight are fed into the mixer. PB grade pulverbakelite and, after mixing, weight% K-0 cryolite and stirring again. The resulting abrasive mass is molded into the product and heated to a temperature of 190 ° C for 12 hours. 8 Example 2. Liquid Bakelite brand BZH-3 (2.1 wt.%) Is loaded into a container and heated to a temperature of 50 ° C. All subsequent operations of example I. PRI and me r 3. Liquid bakelite brand BZH-3. (. 2.1 wt.%) Is loaded into a container and heated to a temperature. All subsequent operations are carried out analogously to example 1. Example 4. BJ-3 liquid bakelite (2.1% by weight) is loaded into the container, 0.5% by weight of AGM-9 organosilicon is added and mixed. Then, the mixture obtained is heated to 40 ° C and poured into a baking dish with grinding material. All subsequent operations are similar to Example 1. Example 5. Liquid BZH-3 brand Bakelite (2.1% by weight) is loaded into a container, 6.5 weight is added. % kr of the organo-organic compound AGM-9 and mixed. Then the mixture is heated to 50 ° C and poured into a mixer with grinding material. Subsequent operations are similar to example 1. Example 6. Liquid bakelite of the BZh-3 brand in the amount of 2.1 wt.% Is loaded into the container, 0.5 wt.% Of the organosilicon compound AGM-9 is added and mixed. Then the resulting mixture is heated to 60 ° C and poured into a mixer with grinding material. All subsequent operations are similar to example 1. For comparison, samples were made as a control. in examples 1 and 4, excluding the heating stage. Abrasive products were made in the form of eights (20 pieces of each variant) and were tested for tensile strength on a test bench (GOST 3552-63). The water resistance of the samples was also determined, since the tool life is directly dependent on its water resistance. Water resistance was defined as the ratio of the strength of samples aged for 24 hours in a 2% soda solution to the strength of dry samples. The test results are summarized in table.

Tensile strength, tag / cm

34 44 38 34 44 38

77 80 78 77 80 78

Relative

an increase

water resistance

Claims (2)

12 Analyzing the data obtained, it can be concluded that increasing the temperature of liquid bakelite and its mixture with an organosilicon compound causes an increase in the strength of abrasive products to 44%, an increase in water resistance up to 16%. The use of the proposed method allows, without significant additional costs, to increase the strength and durability of the abrasive tool during its operation. Claims 1. A method of manufacturing an abrasive tool, comprising moistening an abrasive grain with a mixture of an organosilicon compound and a liquid bakelite, mixing the moistened grain with a bullet55 79 76 74 79 76 6 16 13 12 16 13 verbakelite and fillers and after, blowing the molding of the tool, which is characterized by the fact that, in order to increase the durability of the abrasive tool, liquid bakelite is preheated to a temperature of 40-60 C. 2. The method according to claim 1, wherein the liquid bakelite is heated prior to mixing with silicon organics. 3. Method according to paragraphs. 1 and 2, characterized in that the liquid bakelite is heated in a mixture with a silicone compound. Sources of information taken into account in the examination 1. US patent 304156, cl.51-298 | Publ. 1962. 2. The patent of England 963334, cl. C 3 R, published in 1959.