SU837712A1 - Material for tool-electrode - Google Patents

Description

; one

The invention relates to a technique of dimensional electric machining, in particular, to a conductive material on a graphite (copper) (|) ity) basis, which serves as an electrode tool for electrochemical rounding of sharp edges in holes and grooves of complex configuration.

, - Currently, electrochemical rounding of sharp edges and deburring are used electrodes-tools made of various corrosion-resistant metals (alloys) or graphite (copper-graphite). Said material (semi-finished product for the manufacture of electrodes) is turned into a monolith. The conversion of powders to monomolite is a very complex physical process. AT

In the production of this transformation is carried out by pressing and firing, pressing occurs within 23OO260O kg / cm tl.

These requirements do not allow the manufacture of an electrode-tool of complex configuration without the manufacture of special molds directly on the part. The production of tool electrodes from current-carrying graphite (copper-graphite) blanks on metal-cutting equipment, as well as fabrication from metal, is associated with high labor-intensiveness and high manufacturing cost, especially for electrotools with a complex configuration of contours and their exact position on the product. It is particularly unprofitable to manufacture multi-station electrotools with small series of manufacturing workpieces (especially in pilot production).

. The purpose of the invention is to obtain a material for Electrode Tools with electrochemical rounding of edges and deburring, which has high plasticity and sufficient strength. The fero designation would provide high performance fabrication of complex electrode tools with high accuracy of reproducibility of the shape of machined circuits without the use of expensive molds and precision metalworking equipment. To achieve this goal, the material for the manufacture of current-conducting electrodes-instruments based on graphite (copper graphite) loroika is paraffin oil GOST 1696O-7 iHg, and the ingredients are taken in the following amounts: Graphite (copper graphite) powder5O-75 Paraffin of oil grade Нр25-5О Introduction to the composition of the proposed material as a binding paraffin is particularly due to its high plasticity at 57-64 s and sufficient mechanical strength at operating temperatures (2O-2Sc) of the electrolyte. The process of making this material is simple. The graphite (copper-graphite) pore shock of the required dispersion, previously defatted and dried, is mixed in the indicated ratio at 180 ° C with paraffin oil grade Nd. The resulting mixture is ready for formation. Tools-electrodes are made to round sharp edges into the groove of electrical elements. For; the manufacture of this tool uses a material of the following composition, weight. h .: Graphite (copper-graphite) powder with dispersion of 30 μm6O Paraffin of oil grade Hg 40 Prepared electrode tools are subjected to strength tests. Tests show that if the electrode-tool runs in a jet of electrically with a temperature of 20-2-5 ° C, no geometric changes occur, the shape of the electrolyte does not change, electrical conductivity does not decrease, swelling (weight change) of the electrode-instrument does not occur. to determine the effectiveness of the application of the proposed material for electrochemical edge rounding is carried out on the installation MG 7969-4OO5 on edge rounding in the electrolyte of the following composition, g / l: MacO SO NqNOjLO Nace 10 Processing results at optimum flax ratio of ingredients shown in Table. Tests show that the use of the proposed material for the manufacture of a conductive electrotool for electrochemical edge curling and deburring makes it possible to produce a conductive electrotool that is highly accurate with a solid profile, which leads to an increase in the performance of sharp edge removal on complex parts, improves the quality of processing , as well as to improve the processing accuracy, in addition, the use of the proposed material significantly reduces the time of manufacture and cost st electrode-tool. When the graphite content decreases, the electrical resistance of the electrode sharply increases, which adversely affects the electrochemical treatment.

Graphite (copper graphite)

6 0.18 Good High powder

Paraffin stamps

Graphite (copper graphite

powder

x

Paraffin brand Nh

 -

Claims (1)

1. Vishnevsky, AP and others. Electro-chemical and electromechanical processing of metals. M., Mechanical Engineering, 1971. with. 47