SU1454675A1 - Composition for impregnating abrasive tools - Google Patents

Abstract

The invention relates to the abrasive treatment of materials, such as those prone to burns when grinding, and relates to compositions of an abrasive tool impregnator. The aim of the invention is to increase the grinding performance and durability of the abrasive tool. The composition contains the ingredients in the following ratio, wt.%: Potassium bifluoride 1-4; thiourea 4-6; polyacrylamide 0.7-2; water - the rest. 2 tab.

Description

i

The invention relates to the abrasive treatment of materials, for example, prone to burns when grinding, and relates to compositions of an abrasive tool impregnator.

The aim of the invention is to increase the grinding performance and durability of the abrasive tool.

The composition for impregnation contains potassium bifluoride, thiourea, polyacryl-O amide and water in the following ratio of ingredients, wt.%:

Bifluoride potassium 1-4

Thiourea 4-6

Polyacrylamide 0.7-2

WaterEverything

The impregnation composition is prepared by dissolving the ingredients in water in the following sequence.

A certain amount of polyacrylamide is dissolved in water heated to 80-90 ° C. Then dissolved with continuous stirring, the calculated 15

20

five

 ABOUT

15

20

The amount of potassium bifluoride and thiourea.

The ceramic-bonded abrasive tool is impregnated using the method of free capillary suction when the tool is immersed in a solution at room temperature. The impregnation time is 3-5 minutes (depending on the size and shape of the abrasive tool). After impregnation, the instrument is removed from the impregnator, the solution is allowed to drain from the pore space, placed in an oven and kept there at 80-100 ° C for 4-6 hours. The instrument is removed from the cabinet and cooled in air to room temperature. After drying, the amount of impregnator in the pores of the abrasive tool with a hardness of M2-CM2 is 1.5-2.5% of the weight of the grinding wheels and is optimal because it provides

(L

9) H

ate

unimpeded placement of chips in tool pores.

The use of potassium bifluoride and thiourea as a chemically active element simultaneously intensifies the formation of complex compounds of iron, sulfides and fluorides. Thus, chemical modification of the material being processed contributes to increased grinding performance. Thermal treatment of the impregnated tool in the range of the SO-UO C will polymerise the polyacrylamide, thereby hardening the ceramic bond of the circle and increasing its edge resistance.

Abrasive wheels brand PP200. A: 20v2 25A25PSM18K5, impregnated with various compositions table. 1), on the SG71 machine, samples of 18Kh2N4ASh steel were ground (cemented and hardened to HRC 60-62 according to the technology of gear wheels). Determined: relative grinding productivity (with respect to the wheel impregnated according to Example VI — prototype, taken as a unit), estimated by the maximum depth t, at which ground-free grinding was provided; relative edge resistance, as measured by the number of suitable parts having a profile

impregnation (examples II-IV) provides an increase in the productivity of grinding by 1.51.8 times, the dimensional resistance of the wheels — by 1.8-2.9 times in comparison with the known composition for impregnation (example VI).

five

, 30 surfaces.

0

An increase in the percentage of potassium bifluoride in excess of 4% (examples V, VI) leads to a decrease in the edge-resistance of the abrasive tool, and a further increase in the content of polyacrylamide in excess of 2% to strengthen the bond significantly increased. The density of the impregnator in the pores of the tool. This reduces, as can be seen from the table. 2 (Example V), grinding performance. Reducing the thiourea content to 2% reduces the effectiveness of CAV, and with an increase in its content of over 6%, the amount of ingredient becomes excessive and the thiourea crystals completely fill the pores and also crystallize on the surface of the tool. This dramatically worsens the process of placing chips and leads to the formation of burns on the ground surface.

surface.

Claims (1)

Invention Formula groove with a corner at apex 40 and a radius at the apex g 1, mm. A composition for impregnating an abrasive 35 ceramic bonded tool containing potassium bifluoride and water, characterized in that, in order to increase grinding performance and tool durability, the speed of a circle is m / s; The rate of de- 40 composition additionally contains thiourea and polyacrylamide with the following The tests were carried out on a ZG71 flat grinding machine without the use of coolant in the following grinding conditions: hoists m / min; grinding depth, 005-0,04 mm / stroke. The results of the test impregnated circles are given in Table. 2 Analysis of the results obtained shows that the described composition for the ratio of ingredients, wt.%: Bifluoride potassium Thiourea 45 Polyacrylamide Water 1-4 4-6 0.7-2 Rest Water the ratio of ingredients, wt.%: Bifluoride Kali Thiourea Polyacrylamide Water Table 1-4 4-6 0.7-2 Rest Rest Composition Relative grinding performance 1.1 1.55 1.85 1.6 1.4 one Compiled by L. Sergeeva. Editor A. Makovska. Tehred M. DidykKorrektor, V. Booth Order 7393/21 Circulation 663 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 U546756 table 2 Maximum depth of grinding without grinding, mm 0.022 0.031 0.037 0.032 0.028 0.02 Subscription