SU1076992A1 - Process for manufacturing collector of electric machine - Google Patents

Abstract

A METHOD FOR MANUFACTURING A COLLECTOR OF AN ELECTRIC MACHINE, including making collector plates, installing collector plates, into a case, impregnating the collector with a computer, machining and applying a noble metal coating on the contact surfaces of the collector plates with an electrostatic vibration applied to the electrode, characterized in that the coating of the noble metal is applied by an electric-spark method with superimposed ultrasonic vibrations applied to the electrode, which is applied by applying a noble metal by applying an ultrasonic vibration applied to the electrode, which is applied by applying a noble metal electrode applied to the contact surfaces of the collector plates by applying an ultrasonic vibration to the contact surfaces of the collector plates by applying a noble metal coating onto the contact surfaces of the collector plates. the goal is to improve the quality of manufactured products by increasing the mechanical strength, density and continuity. Coating, coating is applied layer / at a speed of rotation of the collector of no more than 0.1 m / s, the speed of the electrode moving along the axis of the collector 0, 050, 5 mm / rev and the pressing force of the electrode 3-30 g, while the first layer is applied npgi current density of 0.7 -15 A / mm and a working voltage of 15-150 V, and when applying subsequent layers, the current density and operating voltage reduce § by 30-60%. (L

Description

About: co. The invention relates to the technology of manufacturing collectors of electrical machines and can be used in the electrical industry. A known method of manufacturing a collector of an electrical machine, including the manufacture of collector plates, their installation into the core grooves, coating the plates with the galvanic method of noble metals, installing a protective ring on the collector working surface, filling the collector with a compound, removing the protective ring and mechanical processing Cl} Disadvantages of this method - a layer on the technology and poor quality of the prepared products due to the deformation of the coating layer during the removal of the protective ring. Also known is a method of manufacturing a collector of an electrical machine including manufacturing collector plates, installing collector plates in a housing, impregnating a collector with a compound, machining, applying an ultrasonic oscillation method to the contact surfaces of the collector plates of a noble metal coating and applying an ultrasonic vibration to the electrode. poor quality of manufactured products due to insufficient mechanical strength, tightness and continuity of Covers The purpose of the invention is to improve the quality of manufactured products by increasing the mechanical strength, density and continuity of the coating. The goal is achieved by the method of manufacturing an electric machine collector, including the manufacture of collector plates, the installation of collector plates in the body, impregnation of the collector with a compound, mechanical treatment and application to contact the surface of the collector plates of the coating of the noble metal by the electric spark method superimposed on the electrode ultrasound oscillations, the coating is applied in layers at a speed of rotation of the collector of no more than 0.1 m / s, the speed of the electrode moving along the axis of the collector is 0.05-0.5 mm / rev and the pressing force of the electrode is 3-30 g, while the first layer is applied at a current density of 0.7–15 A / mm and an operating voltage of 15–15.0 V, and when applying subsequent layers, the current density and operating voltage decrease by 30–60%. The method of manufacturing the collector of an electric machine is as follows. Copper collector plates are made, after which they are installed in the collector body, then the case assembled with the plates is impregnated with a compound. After impregnation, mechanical treatment, incorporation of dimensions and cleaning of the side surfaces of the collector plates are performed. Then the collector is installed in a special device, the contact plates of the power supply are pressed to the side surfaces of the collector plates, the electrode is made of wire or plates of a noble metal, for example, palladium-iridium alloy, power is supplied, rotation is communicated to the collector, and reciprocating translation of the electrode along the axis of the collector, the electrode is informed by ultrasonic vibrations and closes the contact surfaces of the collector plates with a noble metal. The coatings are applied in the following modes: the rotational speed of the collector is no more than 0.1 m / s, the speed of the electrode moving along the collector axis is 0.05-0.5 mm / rev, the pressing force of the electrode is 3-30 g. The coating is applied in layers. The first layer is applied at a current density of 0.7-15 A / mm and a working voltage of 15-150 V. Then, the above sequence of operations is repeated, reducing the current density and working voltage by 30-60%, and the surface is finished. collector. The number of repeated coating techniques is set depending on the technical requirements of the electrical machine. Each layer can be applied in several passes. At a current density of less than 0.7 A / mm, the coating is not continuous, with gaps, and at a current density of more than 15 A / mm, loose lumps of the coated material are formed on the surface of the part. A similar pattern is observed when the voltage is less than 15 V and accordingly when the voltage is more than 150 V. In addition, when the voltage is more than 150 V, metal burns out. When the collector rotational speed is more than 0.1 m / s, skips and coatings are observed, and at the electrode moving speed along the part axis less than 0.05 mm / rev, the coating is loose, the coating is loose due to uneven coating layering. The speed of moving the electrode along the axis of more than 0.5 mm / rev leads to weak adhesion and coating gaps. Repeated Reception Coverage

1076992

reduced electrical parameters of subsequent layers - high purity

30-60% needed to reduce the surface.

roughness of the coating. The invention allows to increase

Application of the first layer ensure the quality of the production of collectors

high adhesion, and the application of electric machines.

Claims (1)

METHOD FOR MANUFACTURING THE COLLECTOR OF AN ELECTRIC MACHINE, including the manufacture of collector plates, installing the collector plates in the housing, impregnating the collector with a compound, machining and applying the noble metal with an electrospark method on the contact surfaces of the collector plates, which is characterized by applying ultrasonic vibrations to the electrode, which differs by with the aim of improving the quality of manufactured products by increasing the mechanical strength, density and continuity of the coating, the coating is applied in layers / at a collector rotation speed of not more than 0.1 m / s, an electrode moving along the collector axis O, 050.5 mm / rev and an electrode clamping force of 3-30 g, the first layer being applied at a current density of 0.7- 15 d / mm ^ and a working voltage of 15-150 V, and when applying the subsequent layers, the current density and working voltage reduce <g by 30-60%. SU .... 1076992