SU903090A1 - Grinding method - Google Patents

Description

(54) METHOD OF GRINDING

I

The invention relates to grinding technology and the design of tools for its implementation, which can be applied in the processing of materials, such as copper, aluminum, titanium alloys and stainless steels. .

The processing of parts from viscous materials with grinding wheels on metal, ceramic and organic bonds is difficult. The circles are quickly salted and intensively blunt, which requires frequent revisions of the tool and increases its wear. In addition, when blunting the pattern of the circle as a result of increased friction on the machined materials in places of contact with the cru. gnome prignogi.

A known method of grinding parts with a tool in the form of a cylinder is a nz elastic material filled with liquid, the working surface of which is coated with an abrasive. Grinding takes place under conditions of constant clamping of the tool to the workpiece. } 1L of uniform pressure of the abrasive to the surface to be treated, ferromagnetic particles are introduced into the balloon, forming a suspension, and the tool is pressed by applying a constant external magnetic field C. to it.

The implementation of this method makes it possible to increase the uniformity of the abrasive pressing to the surface being treated and the accuracy of processing. However, at the same time, due to an increase in the contact area of the circle with the workpiece, the temperature in the cutting zone 10 increases and the abrasive blunting increases, which leads to an increase in the roughness of the treated surfaces and reduces the productivity of the process.

The purpose of the invention is to increase the production efficiency of sanding and reduce the roughness of the treated surface.

The goal is set to the fact that when grinding with an abrasive tool with a hollow body nz elastic material,

Claims (1)

20 filled with a ferromagnetic suspension, in which the tool is pressed against the surface to be treated by the action of an external constant magnetic field created by a katunpsoy magnetization, the magnet suspension is additionally affected by an alternating magnetic field with a frequency from 1–20 kHz, and the amplitude of the voltage magnitude of the voltage of the subunit is applied. exceeds the absolute value of the direct current supply voltage; The suspension includes parts of the material having a crushed material. It is advisable to use carbonyl iron as a magnetostrictive material, which is affordable and relatively cheap. The application of the proposed method allows, without reducing the accuracy of processing, to reduce friction between the surface of the workpiece and the abrasive wheel, reduce the temperature in the cutting zone and the cutting force to reduce the wear of the abrasive tool, which reduces the roughness of the surface to be processed, eliminates its burns and improves the productivity of the process . FIG. 1 shows an abrasive tool, a longitudinal section; in fig. 2 is a block diagram of the power supply of the bias coil. The method is realized with the help of tools (Fig. 1) in the form of a body 1 of elastic material, for example, rezshal, filled with liquid 2 with particles of material with magnetostrictive properties, for example carbonyl iron with a size of 1-5 microns, thrown in it. An abrasive layer 3 is applied on the periphery of the body. The tool is mounted on a mandrel made of a magnetically soft material with a high magnetic permeability, for example, permallo. Mandrel 4 with nuts 5 with washers. 6 is fixed on the shaft 7. Supporting supports 8 and 9 are also installed here, which are fixed in the housing 10 of the biasing coil 11. The housing 10 is fixedly mounted on the grinding headstock 12. Katushka 11 (Fig. 2) is connected to an adjustable source 13 of a constant low frequency through a low frequency amplifier 14 and an adjustable AC voltage divider 15. In order for high frequency currents not to affect source 13 -dc current, the semiconductor diode 16 and the capacitor 17 are included in the power supply circuit of the coils 11. The oscillation frequency of the variable map field is selected in the range from 1–20 kHz, since it is known that for different materials, the optimum oscillation frequency during vibration nome grinding lies in this range. At the same time, the amplitude of oscillations 4 of the alternating voltage feeding the coil does not exceed the voltage of the direct current supply, due to which the total voltage cannot be equal to the voltage and the necessary clamping of the tool to the part will always be provided. Example. The material to be processed is D16T aluminum alloy: Grinding modes: 3.5 m / s. Pr - 5 m / min, SncmeoosH- Yu mm / stroke, t - 0.01 mm. Abrasive - synthetic DIA 125/100 diamond. The roughness of the treated surface ROI 0,63-0,45, processing capacity of 100 mm / min. Linear wheel wear - 30 microns when removing 3000 mm. The voltage of the direct current is U 24 V, the frequency of the alternating current is 15 kHz, the voltage of the alternating current U is 10 V. Compared to the prototype, the roughness decreased by 0.2-0.3 µm, the productivity increased by 2 times. The use of the invention allows to increase the productivity of the grinding process by 1.5-2 times and reduce the roughness of the treated surface by 0.2-0.3 microns. According to preliminary calculations, the annual economic efficiency from the use of the proposed complex of technical solutions in one enterprise will amount to 50 thousand rubles. Claims of the invention of grinding with an abrasive tool in the form of a hollow body filled with a ferromagnetic suspension, according to which the tool is pressed against the surface to be treated with an external constant magnetic field created by the bias coil, in order to reduce the roughness and shredding performance when viscous materials, as the ferromagnetic component of the suspension, use particles of a material with its own and additionally affect the suspension with an alternating magnetic field with a frequency of 1–20 kHz, while the amplitude of the alternating current supplying the coil does not exceed the direct current voltage. Sources of information taken into account during the examination 1. USSR author's certificate N 534351, cl. B 24 B 13/10, 1979.