SU1004061A1 - Sectionized tool-electrode for electrochemical shaping - Google Patents

Description

This invention relates to electrophysical and electrochemical processing.

Known sectional electrodes are tools for dimensional electrochemical machining with a series supply of technological current to sections containing channels in the body of the tool electrode for supplying electrolyte to the working electrode surface.

The disadvantage of the sectional electrode-tool is the etching during the processing of sections to which no process voltage is applied, which leads to a decrease in the shaping accuracy.

Also known are sectional electrodes, tools for electrochemical shaping, consisting of a body with sections located in it, forming channels between them to supply electrolyte to the working surface of the tool electrode, insulation, located in the channels, and covering each section along its side surfaces ek. ranovSZ.

The disadvantages of these structures are high cost due to

the use of expensive materials for screens, such as platinum, and the need to use an additional DC source to create positive potentials on the screens.

The purpose of the invention is to reduce the cost of the electrode tool while maintaining high accuracy of electrochemical shaping using screens made of a material more electronegative than the material of the sections.

Claims (1)

The goal is achieved by the fact that in a sectional electrode-instrument consisting of a body with sections located therein forming channels between them for supplying electrolyte to the working surface of the electrode-tool, insulation located in the channels and covering each section along its the side surfaces of the screens, the screens are installed with the possibility of autonomous reciprocating movement relative to the sections in the direction of the working feed of the electrode tool with the preservation of electric. contact with sections along their side surfaces from a mechanism made in the form mounted on the housing with the possibility of reciprocating movement from the drive in the direction of the working feed of the yoke and a set of tons of r, the number of which is equal to the number of sections, each screen and passed through two electromagnetic clutches, one of which is fixed in the holder, and the other in the housing, the electrode-tool. Figure 1 presents the proposed electrode tool, the section in figure 2 is a section aa in figure 1. Sections 1 are installed in case 2 Each section has an individual current lead 3. Insulating distance sleeves 4 are installed between the sections, which create a hydrodynamic channel for supplying electrolyte to the treatment area. The guide 5 serves to supply electrolyte and fix the electrode in the machine. The housing has a holder b, which has the ability to move relative to it. For this purpose, a special drive is used, which is connected to the holder by eyelets 7. In case 2 and the holder are coaxially with the direction of supply of the electrode, electromagnetic clutches are installed inside which are spans 9. The number of tons is equal to the number of sections. 10, made of a more electrically negative material than the section. The outer surface of the screen is covered with insulation 11.. The proposed sectional electrode tool works as follows. One or several sections 1 most closely located to the surface being processed are connected to the source of technological current (these sections are determined by the operation of the measurement system). When processing section 1, to which the operating voltage is not applied, are at a positive potential. Screens 10 that enclose sections protect them from bruising because the screen material is more electronegative. However, as the screens 10 are etched, the protection efficiency diminishes and at some point in time the section material begins to dissolve. To prevent this from happening, shifts are proposed to move the screen toward the surface being treated. Moreover, only screens that capture sections that are not connected to the current source must be moved, the remaining screens remain stationary. Motion transmission is realized due to the pull 9, which can move either with the housing 2 or with the yoke 6. Everything depends on how much of the electromagnetic sleeves 8 is turned on. to work. A signal for switching on certain couplings is given from the measurement system. In order for the screens to be etched in close proximity to the working surface of the sections and thereby to provide effective protection in the hydrodynamic channels, insulator 4 is installed, which is fixed in the housing 2 of the tool electrode. The design of the proposed sectional electrode tool expands its technological capabilities. In this case, the ECHO can be carried out at elevated voltages with the exception of the etching of sections. This electrode tool allows additional mechanical refinement of the working surface and eliminates the use of additional current sources to protect the sections from etching. Compared with the sectional electrode-tool for electrochemical machining of GTE blades with the switching section according to the principle of traveling wave. The proposed electrode tool allows machining at elevated stresses with the exception of etching sections, which leads to higher accuracy of electrochemical shaping and surface quality. Preliminary studies to test the effectiveness of using a movable screen to protect a non-operating section from being bruised show that, all other things being equal, in the case of a movable screen, pitting formation on the non-operating section is observed at potentials higher than with a fixed screen. An electrode-instrument consisting of two sections with a screen between them is used as a model. . Technically, the proposed sectional electrode tool is simple and cheap. . Claims of the invention: Sectional electrode-tool for electrochemical shaping, consisting of a body with a section located in it and with forming between them channels for supplying electrolyte to the working surface of the electrode-tool, insulation, located in the channels, and covering each section along its side surface m screens, characterized in that, in order to reduce the cost while maintaining high precision shaping, when using screens made of a material more electronegative than the mother