SU1399103A1 - Mass for making abrasive tool - Google Patents

Abstract

The invention relates to the manufacture of an abrasive tool manufactured by the method of casting and intended for the treatment of viscous materials - steels, aluminum alloys. The aim of the invention is to improve the cutting properties of the tool, improving the quality of the surface to be machined. The instrument is prepared from a composition containing, in wt%: polyurethane prepolymer based on polyfurite, m. M. 1000 and 2,4-toluene diisocyanate / 1: 2 / 24.6-25.0; fluorine-containing polyurethane prepolymer based on 1, I, 5-trihydroperfluoroamyl-glycidyl e-Lear and 2,4-toluyl di-isocyanate (1: 2) 32.0-32.4; a crosslinking agent, for example 3,3-dichloro-4,4-diaminodiphenylmethane, 10.9-11.1; abrasive, for example diamond synthetic material AC4 100/80, - the rest. 1 tab. (L

Description

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The invention relates to the manufacture of an abrasive tool manufactured by the method of casting and intended for honing in fine materials - steels and aluminum alloys.

The purpose of the invention is to increase the tooling properties and improve the quality of the surface to be treated by increasing the binder hardness while maintaining its sufficient elasticity.

The abrasive mass for the manufacture of the scaffold tool consists of an abrasive grain and a polymer binder, including polyurethane prepolymers with a crosslinking agent, and a fluorine-containing prepolymer in the following ratio of components, wt.%:

Iolyurethane

prepolymer,

for example the prepolymer SKU-PFL

100 / 100024-6-25,0

Fluorinated

polyurethane.

the prepolymer 32,0-32,4

A crosslinking agent

for example 3,3-di

chloro-4,4-diaminodiphenylmethane 10, 9-11.1

Abrasive, for example

diamond synthetic material, AC4 100/80 Else

In the abrasive mass, as the fluorine-containing polyurethane prepolymer, the reaction product is 1, 1, trihydroperfluoroamyl - glycidyl ether, m. M. 800 and 2,4-toluidine diisocyanate in a molar ratio of 1: 2.

The choice of fluoropolymer-based polyurethane polymer is based on the need to co-tool with high TWP-2 hardness, but at the same time maintain sufficient flexibility, i.e. so that with high hardness it does not occur its brittle destruction in case of accidental impacts. High hardness contributes to the strong consolidation of abrasive grains in it.

Example 1. Preparing a composition of the following composition, wt.%:

Polyurethane prepolymer,

for example, CU-PFL 100/1000 24.8

Fluorine-containing polyurethane prepolymer, for example

50

five

0

0

five

measures based on 1, 1, 5-trihydroperfluoroemylglycidyl ether, 32.2 Crosslinking agent, for example 3,3-dichloro-4,4-diaminodiphenylmethane 11.0 Abrasive, for example diamond synthetic material AC4 100/80 32.0 V heated to A 60 ° C mixture of prepolymers (obtained from polyether with a molecular weight of 1000 and 1,1,5-trihydroperfluoroimyl glycidyl ether with a molecular weight of 800 and 2,4-toluidine diisocyanate at a diol-diisocyanate ratio of 1: 2) the abrasive material is stirred at the indicated temperature for 5 minutes and the molten crosslinking agent is added. The mixture is stirred for 3-5 minutes at and poured into prepared .l for the manufacture of an abrasive tool. Stand 12 hours at room temperature and 10 hours at 100 ° C.

Example 2. Preparing a composition of the following composition, wt.%: Polyurethane prepolymer, for example SKU-PFL 100 / 100024,6

Fluorine-containing polyurethane prepolymer, for example, based on 1,1,5-trihydroperfluoroamylglycidyl ether32,4 A sishvayuschy agent, for example 3,3-dichloro-4,4-diaminodiphenylmethane 10,9 Abrasive, for example, a diamond synthetic material - Ostal – AC4 100 / 80 noe

Obtaining abrasive mass lead analogously to example 1.

Example 3. Preparing a composition of the following composition,% by weight: Polyurethane prepolymer such as SKU-PFL 100 / 100025.0

Fluorine-containing polyurethane prepolymer, for example, based on 1,1,5-trihydroperfluoroamylglycidyl ether 32,0 Shvivakntsy agent, for example, 3, Z-dichloro-4,4-diaminodiphenylmethane

Abrasive, for example

synthetic synthetic materials AC4 100-8Sktematerial

Obtaining abrasive mass is carried out analogously to example 1. Abrasive tools made according to the given examples are rectangular bars on a metal substrate having a threaded hole for installation in the head of the honing machine.

The choice of the ratio of fluorinated and non-fluorinated prepolymers was made on the basis of data on the hardness of polyurethane-urea elastomers at various ratios of the indicated prepolymers. With an increase in the content of the prepolymer SKU-PFL more than 25%, the hardness of the polymer bond drops sharply, which reduces the cutting ability of the tool, and with an increase in the fluorine-containing prepolymer more than 32.4%, the curing rate increases dramatically, making it impossible to process the abrasive mass. When the temperature of the mixture of reagents is reduced, stratification of the prepolymers is observed, which leads to a sharp anisotropy of the properties of the resulting component, and with an increase above 65 ° C, it increases the polymerization rate, as a result, the processing of the abrasive mass becomes impossible.

With an equimolar ratio of fluorine-containing prepolymer and SKU-PFL prepolymer, the hardness is 0.013 (49.00). With a ratio of fluorinated prepolymer to SKU-PFL prepolymer, 60%: 40% (molar) of the polymer increases sharply to 0.006 (106 ,sixteen). When off in percentage composition within. hardness is respectively 0.0058 (PO) and 0.0065 (98.57).

With an increase in the molar fraction of the fluorine-containing prepolymer up to 70%, incompatibility of the prepolymers begins to appear, resulting in the preparation of samples with sharp anisotropy of properties and sharply non-uniform in color (crookedness). With an increase in temperature, this mixing is avoided, but due to a sharp increase in the reaction rate and, consequently, a rapid increase in the system’s bone, the reaction mass does not increase.

0

five

five

0

five

0

five

0

and

recycle. In addition, samples obtained without spilling the mass into the forii are easily destroyed (glassy polymer with high brittleness)

The finished abrasive tool is tested for the strength of grain fixation in the tool, its cut-off properties and surface quality.

Grain fixing strength is estimated by the amount of worn abrasive tool material in grams, cutting properties by the amount of metal removed from the treated surface in grams per unit of time, and the coefficient of cutting ability by the ratio of the amount of metal removed from the metal surface to the worn material of the abrasive tool.

The surface quality of the machined part is evaluated by measuring the roughness by the parameter Rg.

To determine these indicators, the abrasive bars are fixed in the head of the honing machine and the batch is machined.

Comparison was made with bars of the following composition, wt.%: Polyurethane prepolymer SKU PFL 100 / 100034.2

Spinous agent (3,3-dichloro-4,4-diamino-diphenylmethane) 2,6

Epoxy Novolac Copolymer4.0

Aerosil2,0

Titanium dioxide2.0

Abrasive - synthetic synthetic diamond powder AC4 100-80 Others

The tests were carried out on a vertical-honing machine model 383. The processed material is 40X HB 230-270 steel. The diameter of the hole to be machined is 64 mm, the length is 160 mm. The tool used was bars of size 60 108-3, made from the specified abrasive mass.

Cutting conditions: pressure of bars - 6 kg / cm; hopping speed - 57 m / min; the velocity of the forward movement of the hone is 18 m / min; single part honing time - 1 min; Coolant - a mixture of 75% kerosene and 25% industrial oil - 20.

tests presentedResults

us in the table.

Thus, the proposed abrasive mass in comparison with the known has a high cutting ability, which is 15-16 times higher than that of the known material. In addition, the surface roughness after treatment with the proposed mass lies in the range of 0.08-0.11, which is significantly better than that of the known material (Ra 0.23-0.39).

Claims (1)

Invention Formula Mass for making abrasive tools containing abrasive and polyurethane prepolymer and well known 1 2 3 0.024 0.02 0.02 0.025 0.90 1.17 1.16 1J2 In order to improve the quality of the treated surface, the mass additionally contains fluorine containing prepolymer, which is a product with the interaction of 1,1,5-trihydroperfluoroamylglycidyl ether, m. m 800 and 2,4-toluene diisocyanate in a molar ratio of 1: 2 with the following ratio of components, wt.%: Polyurethane prepolymer SKU-PFL 100/1000 2A, 6-25.0 Fluorine-containing polyurethane prepolymer 32.0-32.4 Cross-linking agent 10.9-11.1 Abrasive 0.23-0.39 0.08-0.11 0.08-0.1 1 0.09-0.12