SU618233A1 - Method of obtaining shaped holes by electrochemical piercing process - Google Patents

Description

The invention relates to electrochemical piercing of holes, cavities and can be applied in the processing of dies, brackets and other NEP ali general mechanical engineering.

Methods are known for producing shaped holes in the process of electrochemical flashing by an electrode tool, having a working collar of constant height and an end part on the side surface, which wipes the configuration of the hole Ij being machined.

A disadvantage of the known methods is the impossibility of obtaining shaped holes in the plane perpendicular to the feed direction, the configuration of which is not equidistant to the working end of the electric tool.

The purpose of the invention is to obtain in the process of electrochemical firmware circuits that are not equidistant to the working end of the electrode tool.

This is achieved by the fact that according to the proposed method, the firmware is led by an electrode tool with a variable

to the perimeter, the height of the working shoulder defined at any point of the perimeter from the pattern relating the height of the working shoulder to the size of the side clearance formed during processing and calculated by the formula

;

H 2C

where H is the height of the working collar;

V is the feed rate of the electrode tool; Og - side clearance; front set for. aor; C - coefficient characterizing

 processing mode.

If, for example, it is necessary to treat the spline hole, then the electric tool is cylindrical, of the same diameter, which is calculated by the formula

D,

I3o-2oig,

where TEC is the diameter of the electrode tool;

Dff is the diameter of the hole, and the height of the working shoulder (H) around the perimeter of the end face is made variable, and the depth of the slot, w & the size of the side gap (a g) in the hole, determines the height of the shoulder (H) at this location.

In the case of a hole (cavity), for example, a trapezoidal contour, with a rectangular electrode tool, the height of the working shoulder (H) is changed, increasing it from the smaller base of the trapezoid to the larger one as a function of the angle of the lateral sides to the base of the trapezoid,

(as).

FIG. 1 and 2. A rectangular electrode-tool is shown and the configuration of the hole obtained by machining in FIG. 3 and 4 - the working part of the cylindrical electrode-tool and the profile of the hole being machined by it; in fig. 5 and 6 are the working part of the rectangular electrode tool and the profile of the hole being machined by it, respectively.

When machining with an electrode tool having a housing 1 and an insulating coating 2 with a variable collar height (Fig.) And Ve width (Fig. 2), a cavity is formed in the treated part 3, the size of which is wide as a width from B. co rt (figure 2).

The use of the proposed method of receiving shaped holes will make it possible to obtain holes, cavities, wells of complex contours that are not equidistant to the end part of the electrode tool with a simple geometric shape of the end part of the electrode tool.

also improve the hydrodynamic mode of the process, which will, accordingly, lead to an increase in the quality of processing and, in addition, will expand the technological possibilities of electrochemical processing.

Claims (1)

1. Collection ENIMS, Electrochemical methods of metal processing, p. 152-153, 1970. YES (Rig. G JT-S (Rig.b