RU1815039C - Method of contact-erosion grading of diamond wheels - Google Patents

Abstract

Usage: profiling of rectangular annular grooves in diamond circles on conductive ties. SUMMARY OF THE INVENTION: an electrode tool for profiling consists of bottom 2 and; the upper 3 parts of a rectangular shape are electrically insulated by a gasket 4. The height of the lower 2 parts of the electrode is equal to the height Hz of the profile of circle 1. The width of the electrode over the entire height is equal to the width of the profiled groove. In the profiling process, the lower surface of the electrode is positioned tangentially to the surface of the circle 1, the rotation of the circle and the supply to the electrode are set. The profiling process is stopped at the end of the contact-erosion interaction of the circle with the lower part of the electrode. The end of the process can be judged, for example, by EP, by the absence of a working current in the circuit of the ammeter AZ. 4 ill.

Description

The invention relates to electrical discharge machining, in particular to the profiling of diamond wheels on conductive bonds.

The purpose of the invention is to improve the accuracy of profiling of rectangular grooves in a rectangular shape. . ; .. In FIG. 1 and 2, profiling schemes are shown reflecting the initial and final stages of processing, respectively; in FIG. 3 is a section AA of the electrode-tool in FIG. 1; FIG. 4 is a view along arrow B in FIG.

2 .: ......

The diamond wheel 1 is profiled with a tool electrode, the height HI of which is less than the diameter D of the wheel 1 and which consists of lower 2 and upper 3 parts arranged in the direction of rotation of the diamond wheel 1 in succession with rectangular cross sections, electrically isolated by a gasket 4. Using ammeters AI and Ag carried out. the contact-erosion process is controlled in the zone of interaction of the diamond wheel 1 with the upper 3 and lower 2 parts of the tool electrode connected to the negative pole of the DC source, respectively.

Height Y2. the lower part 2 of the tool electrode. is equal to the required height Нз of the profile of the circle 1, and the lower surface is tangent to the surface of the circle 1, The width of the electrode tool over the entire height HI has a value equal to the required groove width. The longitudinal feed is set parallel to the lower surface of the electrode-tool. Okanchanise contact-erosion interaction of the diamond wheel 1 with the lower part 2 of the electrode-tool indicates the formation on the circle 1 of an annular groove with a profile similar to the profile of the lower part 2. The criterion for evaluating the end of the specified contact erosive interactions and, consequently, the termination of the profiling process is, for example, the absence of a working current. In the circuit of the ammeter A2. Further profiling is unacceptable, as it will lead to distortion (increase in the height Нз) of the profile of circle 1.

It should also be noted that, along with high accuracy, the method also provides high profiling performance due to the excess of the height Hi of the tool electrode over the required height Hz of the diamond wheel profile 1. Moreover, the presence of the upper part 3 of the tool electrode and the possibility of varying it

height allows you to control performance.

The method is implemented as follows. Set the electrode tool

a predetermined structure relative to the diamond wheel, provided that its lower surface is tangent to the surface of the wheel. Report the rotation to the diamond wheel. Turn on the source of the track and

0 sets the output voltage. Turn on the coolant in the treatment area. Report longitudinal feed. The process is monitored. At the end of the contact-erosion interaction of the circle with

5, the lower portion of the electrode tool stops the profiling process.

Example. The effectiveness of the method was investigated on a modernized universal grinding machine mod.ZMb42E,

0 equipped with a DC source with a power of 1.5 kW with an adjustable output voltage in the range of 6-3.6 V. Profiled diamond wheels of type 1A1 200x20x5x32 AC6 80/63 M1 100%; It was required5 to obtain annular grooves of a rectangular shape with a depth of 3.5 mm. The electrode tool consisted of two parts made of steel 45 HRQ 58-61 and isolated from each other by textolite

0 gasket tolidinry 3 mm. The height of the lower part was 3.5 mm, and the upper part was -30 mm. Electrical and mechanical parameters had the following meanings: output voltage 22 V, maximum force

5 operating current 25 A, diamond wheel rotation speed 2240 rpm, longitudinal feed rate 1.2 mm / min. As a coolant, we used a 0.5 percent solution of soda ash, which was fed into the zone of irrigation treatment at a flow rate of 2.5 l / min. As a result, annular grooves were obtained with a profile similar to the profile. ,, of the lower part of the electrode-tool. FORMULA AND ZOBETEN

5 The method of contact-erosion profiling of diamond wheels on conductive bonding according to the scheme of deep grinding with an electrode-tool, the height of which is less than the diameter of the wheel, consisting of consecutively located in the direction of rotation of the diamond wheel of the lower and upper electrically isolated parts with rectangular cross-sections with the exception that, in order to increase the accuracy of profiling of rectangular grooves in the rectangular shape, the height of the lower part of the electrode is equal to the required height Ofil circle, the bottom surface is placed during profiling

electrode tangent to the surface of the contact-erosion interaction of the circle and stop the process at the end of the circle with the lower part of the electrode.

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