SU1587062A1 - Lubricant for grinding hard alloys and high-speed steels - Google Patents

Abstract

This invention relates to lubricants for grinding hard alloys and high-speed steels. The goal is to improve the quality of the treated surface and the performance of the grinding process. The lubricant contains, wt%: sodium chloride 10-18, chromic anhydride 25-35, phthalocyanine 8-12, paraffin - the rest. This lubricant reduces the surface roughness from 0.32 to 0.11-0.16 μm and increases the productivity of the process by 1.5-2 times. 2 tab.

Description

This invention relates to lubricants for grinding hard alloys and fasting their steels.

The aim of the invention is to improve the quality of the treated surface and the performance of the grinding process.

Sodium chloride, chromic anhydride, phthalocyanine and paraffin are used to prepare the lubricant.

In the process of grinding under high temperatures, sodium chloride decomposes to release chlorine, which when heated easily interacts with organic substances, in particular paraffin, in which it replaces a hydrogen atom, forming chloroparaffin, which has high heat resistance and reactivity. In the process of thermal-oxidative degradation, it does not form solid residues (resins), which act as an abrasive material and degrade the surface quality.

Chromic anhydride CgOz (chromium trioxide), which produces oxidation of the surface layer, facilitates the deformation of the metal during grinding, and during the oxidation process itself is converted into chromium oxide, which helps smooth the microrelief of the surface to be treated (polished) and reduce its roughness.

Phthalocyanine is introduced as a high-temperature lubricant. At high temperatures, Phthalocyanine reacts with cobalt contained in the hard alloy (5-15%) and high-speed steel (3-10%) and forms a solid lubricant in the form of a film with high heat resistance and reducing when heated the coefficient of friction between the grains of a circle and the material being processed “This film has a lower mechanical strength than the underlying layers, therefore, the deformation of the surface layer by grinding occurs with less effort.

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friction strength and temperature are lowered. This makes it possible to intensify the processing modes, to increase the productivity of the grinding process and to achieve high surface quality.

The lubricant is prepared as follows. Finely dispersed sodium chloride powder, chromic anhydride and paraffin chips are added to phthalocynin melted at 27 bC. After thorough mixing, the melt is cooled until solidification begins (viscous state) and poured into cylindrical steel forms.

j Dp determination of optimal soder; The sleds of the components are made of a smear composition, which is presented in Table 1. I The degree of effectiveness of each lubricant composition is assessed by determining the grinding performance and the roughness of the treated surface.

i The proposed formulations are tested in Comparison with the known composition 6,: containing, in wt.%: ammonium dichromate; 23; glycerin 12; D-glucose 15; paraffin the rest of

The tests were carried out on a flat plate modal machine. ЗГ71М. Processing modes: circle rotation speed of 35 m / s, longitudinal feed of 1.5 m / min; cutting depth 0.1 mm. The plates are processed; the plates are 20x20 mm in size made of hard alloy of the BK8 and T15K6 grades and fast rezhesh; they have increased productivity of R6M5K5 (HRC65-66). Processing

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the cube is made with an AMS diamond wheel of 200x20x75x5; ASO; 100/80 B1, 100% concentration Examined lubricant is applied to the working surface of the wheel.

The surface roughness is determined on a VEI-Caliber profilometer-profilograph. The presence of burners and 1H microtreshls is determined visually using an MBS-1 binocular loupe.

I Grinding performance is estimated by the amount of sshiphpovannogo metal per unit time.

The test results are shown in Table. 2 ..

As can be seen from the data table. 2, the surface roughness decreases from 0.32 to 0.11-0.16 µm, and the productivity of the process increases 1.5-2.0 times.

Claims (1)

Invention Formula Lubricant for the conversion of hard alloys and high-speed steels containing paraffin, characterized in that, in order to improve the quality of the machined surface and the performance of the process, the lubricant additionally contains sodium chloride, chromic anhydride and phthalic anine 1 in the following ratio of components, wt.%: Sodium chloride 10-18 Chromic Anhydride 25-35 Phthalocyanine8-12 ParaffinEverything Else Composition Component content, wt.% 5 101418 22 20 253035 40 3 81012 15 Up to 100 up to 100 up to 100 up to 100 Table 1 Burns and microcracks are observed on the surface of the samples. table 2