SU1371815A1 - Method of electric discharge chemical straightening - Google Patents

Abstract

The invention relates to the field of electrical processing, in particular, to editing abrasive nt circles with a conductive bond, and can be used to form a shaped profile of the peripheral surface of circles from superhard materials, such as diamond circles on a metal bond. The purpose of the invention is to improve the performance of the editing process by optimizing the frequency and duration of the arc bits that occur between the right-hand electrode tool and the circle 1. Circle 1 is guided by a set of plates 3, which are fixed console at a distance that excludes the possibility of contact between adjacent plates edit zone. The right electrode tool is made in the form of a set of parallel plates 3, the cross section and length of which is chosen from the condition of equality of the frequency of their own harmonic oscillations of 10-15 kHz. 1 il. IL- / i (L with 00 t L. SL

Description

1-1

The invention relates to electromechanical processing methods and can be used in forming a shaped profile of the peripheral surface of psihfapny circles of superhard materials, for example, diamond wheels on a metal bond.

The purpose of the invention is to improve the performance of the editing process.

The drawing shows the scheme of the method realization.

The scheme includes a diamond wheel 1 being machined, an electrode tool housing 2, which contains a set of parallel plates 3 and metal gaskets 4 with channels for coolant supply to the gaps between the plates. Gaskets also provide electrical contact between adjacent work items.

The electrode tool is brought to the rotating surface of the circle 1 to the touch. Then, simultaneously with the supply of electrolyte, a direct current source is switched on. As a result of the interaction of the plates 3 with the surface of the circle, oscillations are generated at the ends of the latter. Discharges occur between the right plates and the surface of the circle, causing an electroerosive effect on the surface of the circle. The frequency of occurrence of these bits and their duration are due to the mechanical and geometrical characteristics of the plates 3 and, to a lesser extent, the speed of rotation of the circle.

The eigenfrequency of harmonic vibrations of the plates, which allows to obtain the highest performance of the straightening process, is 10–15 kHz, which is provided by the geometrical and mechanical characteristics of the plates. Productivity can also be significantly improved by increasing their number, which, in turn, depends on the diameter of the circle being processed.

The calculation of the parameters of the plates is as follows.

Natural frequency of harmonic oscillations of a rectangular plate in the air

(and

Where

 Where

5 Q

a is the length of the plate; h is the plate thickness; Y is the specific gravity of the plate; D is the cylindrical bending stiffness

Eh

T2 (E is Young's modulus; is Poisson's ratio, relations (1) find the parasadop one of them is conD

(2)

0

Of

meters a and h, structurally.

An analysis of fencing (1) shows that in the range of 10–15 kHz, each plate can wear out 0.2 times its length.

The dimensions and material of the plates can be varied within acceptable limits. To account for the influence of the medium in which each plate is located, i.e. the cooling fluid passing between the plates will be used by the ratio

(3)

de b P

 plate width; natural frequency of oscillations of the plate in the liquid; liquid density and coefficient depending on

relationship -. but

25 Q

35 The plates are placed at a distance that excludes the possibility of their contact with each other with free oscillations. At the same time, the maximum permissible arrow of the plate deflection is given from the ratio

40

2 and 6,

3 Eh K where & is the ultimate strength at the bend,

K - safety factor. This parameter is the minimum distance dp for placing the plates from each other, excluding their mechanical contact.

The implementation of the proposed method improves the editing performance, which is achieved by optimizing the frequency and duration of the bits.

Claims (1)

Invention Formula  The method of erosive-chemical straightening of diamond wheels on a conductive bond by an electrode-tool, consisting of a set of right parallels plates, which are fixed in the pumping of the working environment, differ in the choice of console at a distance, excluding and so that, in order to increase the possibility of contact between co-adjustments, cross-section and by the gray plates in the straightening zone, the length of the plates is chosen from the conditions including the rotation of the circle, the working frequency of the natural frequency is the harmonic feeding of the electrode-instrument and the continuous oscillations of the plates 10-15 kHz.