SU1662778A1 - Method for electrical discharge truing of diamond wheels - Google Patents

Abstract

The invention relates to metalworking, namely to EDM straightening of diamond wheels. The purpose of the invention is to improve the performance of edits. The process is carried out with two identical tool electrodes (EI). The EI is moved reciprocally along the line generator with the same speed. In the process of editing, the total area of the erosion interaction of the EI and the circle is constant. One EI is arranged symmetrically relative to the width of the circle, the other - outside the circle. If the width of the EI does not exceed the width of the circle, then the distance between the axes of the EI is set equal to the width of the circle. If the width of the EI exceeds the width of the circle, then the distance between the axes of the EI is set equal to the width of the EI. After installation, EI is moved in the opposite direction towards each other. 2 hp ff, 5 ill.

Description

The invention relates to the field of metalworking, in particular to EDM straightening of diamond wheels.

The purpose of the invention is to improve the performance of edits.

In the method based on the right-two electrode tools with the same geometrical dimensions and speeds of reciprocating movement, the tool electrodes are moved in opposite directions, and the maximum distance between the axes of the tool electrodes when one of them is located symmetrically on the surface of the circle , - set equal to the width of the diamond ring of a circle, if the width of the electrode-tool does not exceed the width of the diamond ring, or equal to the width of the electrode-tool, if the width Electrode-tool exceeds the width of the diamond ring.

In the method, the tool electrodes, when reciprocating along the generatrix of the machined surface, come out of contact with the diamond wheel, which is a prerequisite for preventing distortion of the circle profile when editing by this method (bending method), resulting in a change in the contact-erosion interaction areas with a diamond wheel of each one.

Due to the opposite direction of movement of the electrode tools and the functional connection of the distance between their axes with the width of the diamond ring, this change occurs so that if the interaction area of one of the tool electrodes decreases, the interaction area of the other increases. At the same time, the area reduction factor is equal to the coefficient increases at each instant of editing. As a result, the constancy of the total

with

with

about

ON K

N1 VI 00

the area of interaction of both electrode tools with the diamond wheel during processing.

FIG. 1 shows the editing scheme for moving the electrodes in one direction; in fig. 2 is a timing diagram of the edit according to the method of FIG. one; in fig. 3 - straightening diagram when the width of the diamond ring of a circle exceeds the width of the electrode tool; in fig. 4 is a time sequence diagram of editing according to the method of FIG. 3; in fig. 5 - straightening diagram when the width of the electrode tool exceeds the width of the diamond ring of the circle.

The electrode-tool 1 (Fig. 1) and the electrode-tool 2, having the same geometrical dimensions, direction and speed of movement, simultaneously come into contact with the diamond wheel 3 and simultaneously come out of the contact. Electrode-tool 1 from position 1.1, and electrode-tool 2 from 2.1 are first moved respectively to 1.2 and 2.2 (shown by dashed lines), where the maximum total contact area is reached, further to 1.3 and 2.3 where there is no contact, and then vice versa.

At the same time, there is no contact at the beginning of the movement of the tool electrodes during the time TI. Further, in period T 2, the contact area S increases from zero to a maximum value of 5 (Msx), which is maintained for Ts. As the tool electrodes move during the period T4, the contact area S decreases to zero, which persists until the end of the stroke during Ts. With the return movement of the electrogens, the cycle is repeated.

The electrode tool 1 and the electrode tool 2 have opposite directions of movement (Fig. 3) and their width B is less than the width H of the diamondiferous ring. Circle 3. In this case, the maximum distance L between their axes, when the electrode-tool 2 is located symmetrically to the surface of the circle 3, is equal to the width H of the diamond-bearing ring (L Н). First, the electrode tool 1 is out of contact with the diamond wheel 3 in position 1.1, and the electrode tool 2 is in contact at 2.1. Electrode tool 1 comes into contact with circle 3 and moves to 1.2, and electrode tool b comes out of contact and moves to 2.2 and so on. In this case, the total area of contact-erosion interaction is constant and maximum, despite the fact that the area of interaction of one of the electrode-instruments decreases, while the other increases.

 Both tool electrodes, made of the same material, have the same width B and thickness, which ensures the equality of the areas of their interaction with the diamond wheel. Also set the same speed of the reciprocating motion of the electrode-tools. Violation of these conditions leads to a violation of the constancy of the total area of interaction of the electrodes.

When editing, the area of contact-erosive interaction of the electrode tools with the diamond wheel (Fig. 4) is constant and has the maximum value Zmax during the cycle and the entire time of editing T.

When the width B of tool electrodes 1 and 2 exceeds the width H of the diamond ring of a circle, the distance L between the axes of symmetry of the tool electrodes is equal to the width B of the tool electrodes. The sequence of changing positions of the electrodes5 of the instruments is the same as in FIG. 3

The method is implemented as follows. Set the maximum distance between the tool electrodes. They are informed by the opposite reciprocating movement along the generator of the surface of the diamond wheel. Include a source of direct current and coolant in the treatment area. Set the required output voltage of the current source. The tool electrodes are brought together before the contact with the diamond wheel and the mortise feed for each reciprocating stroke is reported. At the end of the edit, the electrodes are retracted.

0Studies show that, all other things being equal, technological conditions (rotation of the diamond wheel is 2240 rpm, the speed of the reciprocating movement of the tool electrodes is 3 m / min,

5 transverse feed rate 0.004 mm / stroke,

output voltage of the current source 30 V)

method provides performance

. edits 560 - 600 mm / min, which is 1.6 - 1.8

times the productivity of the rule of law in a known way.

Claims (3)

Claims 1. A method of erosive straightening diamond wheels on a metal bond with two identical tool electrodes, which are reported to reciprocate at the same speed along a circle wheel, characterized in that one of the tool electrodes is positioned out the processed surface of the circle, and the other - symmetrically relative to it and tell them the movement in opposite directions towards each other. 2. A method according to claim 1, characterized in that electrodes are taken with tools with a width less than the width of the diamond wheel, and the initial distance between their axes is set equal to the width of the circle. 3. A method according to claim 1, characterized in that the electrodes are taken tools with a width greater than the width of the diamond wheel, and the initial distance between their axes is set equal to the width of the electrode electrode. / „ S G " i1 " Ti T2 G3 T47S T FIG. 2 Figz Fig 5