SU1553365A1 - Impregnator for abrasive tool - Google Patents

Abstract

This invention relates to compositions for impregnating an abrasive tool used in grinding both with and without the use of coolant. The aim of the invention is to improve the quality of the processed surface of workpieces from hard-to-machine materials. The impregnator contains the following components, wt%: polycaproamide 40-50, copper formate 10-20, monomer E-caprolactam - the rest. 2 tab.

Description

This invention relates to compositions for impregnating an abrasive tool used in grinding both with and without the use of coolant.

The purpose of the invention is to improve the quality of the processed surface of workpieces from difficult-to-machine materials.

Abrasive tool impregnator for grinding parts from hard-to-machine materials contains E-caprolactam monomer, polycaproamide and copper formate as antifriction substance, with the following ratio of components, wt%: polycaproamide 40-50, copper formate 10-20, E-caprolactam monomer else .

Thermal destruction of polycaproamide contained in the polymer circle of the polymer leads to rupture of the polymer. molecules by chemical bonds of principal valences, side groups are split off to form highly active free radicals. Groups of radicals interact with the metals of the treated surface and cause adhesive interaction of the circle with the part, which reduces the quality of the surface, as here wear is carried out by tearing out the adhesively adhered surface regions. In order to avoid this, the E-caprolactam monomer is introduced into the impregnator, which blocks free radicals, i.e. free radicals react with the monomer E-caprolactam. As a result, the polymer chain is restored and self-generating organic films are formed, contributing to a more uniform distribution of contact pressures and preventing the appearance of work hardening during high grinding forces.

The copper formate in the polymer matrix decomposes at a grinding temperature with the release of a metal in a colloidal state, which, having a high chemical activity, interacts with the treated surface and forms anti-friction films on it. So the process

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friction is localized in the thinnest surface layer and thereby creates a localized positive shear strength gradient, which facilitates the deformation of the material.

And, finally, at high grinding temperatures, steel became containing a significant amount of nickel and iron, for example, stainless steel, these metals interact with the polycaproamide melt, as a result of which the thinnest (/ 1-2 μm) appears on the surface of the workpiece.

Live circles from electrocorundum PP 200x20x32 mm at elevated conditions: a circle rotation speed of 35 m / s, a longitudinal feed of 1.5 m / min, a transverse feed of 0.08 mm / two strokes. Machine mod. ZE711V-1.

Circles soaked in the known and proposed ways.

After impregnation, the circles were dried at 75 ° C. for 3.5 hours.

The boundary values of the content of the components in the constitution are due to the mini

a layer of metal polymer which is capable of high microhardness values,

It improves the wear resistance of de-alia during their operation, blocking the spread of surface cracks.

The impregnator is prepared as follows .20

Polycaproamide with a molecular weight of 15,000 is melted in a bath at 225DC. E-caprolactum and copper formate (honey and formic acid salt) are successively introduced into the melt. Melt 25 is thoroughly mixed for 10 minutes. Heated abrasive wheels heated to 40-50 ° C are melted, allowed to stand for 10 minutes, removed from the bath and dried at 70-80 ° C for 3-4 hours. 30

In order to determine the optimal content of the | ani components, the extent to which the impregnator compositions were tested (Table 1). Degree of effectiveness

each composition was evaluated by the size of the work hardening, the coefficient of friction and roughness of the treated surface.

The degree of work hardening of the parts after grinding was determined by a measuring substance, differing in the hardness of the surface layers with the help of the PMT-3 device with a load of 981 N.

The frictional characteristics were studied on the MI-III friction machine with a load of 3 MPa and a slip speed of 0.3 m / s when interacting with steel samples (s-al H18N9T, HRC 52-53 Ra 1.25).

The roughness of the treated surface was evaluated visually using standards.

Grinding from stainless steel XI8H9T (HRC 52-53) was carried out abra

coefficient of friction and surface roughness. A decrease or increase in the content of components in relation to the optimum leads to a deterioration in performance (Table 2).

Thus, it follows from the results of is-1 torture that the optimal formulations causing the maximum positive effect are compounds 2-4.

When grinding steels with circles, impregnated with this composition at elevated conditions, there is no work hardening of the machined surface and the coefficient of friction is significantly reduced, which makes it possible to improve the quality of the machined surface of parts from difficult-to-work materials and increase their wear resistance.

Claims (1)

Invention Formula Impregnator abrasive tool containing polymer and antifriction substance, distinguishes y and with the fact that, in order to improve the quality of the processed surface of workpieces from hard-to-machine materials, the impregnator additionally contains E-capralactam monomer, while the composition contains polycaproamide as a polymer, and copper formate as an antifriction substance in the following ratio of , wt.%: Nolikaproamid 40-50 Copper formate 10-20 Monomer E-caprolactam Else 288 263 257 257 282 Table Table 0.63 0.32 0.32 0.32 0.63