Pulse discharge dressing parameter and motion parameter control method for grinding wheel micro-abrasive dressing

Abstract

The invention discloses a grinding wheel micro-grinding particle slicking pulse discharge trimming parameter and motion parameter control method. The method comprises the steps that firstly, an electrode and a to-be-trimmed grinding wheel are clamped on a machine tool, and a discharge loop is formed through connection with a graphite electric brush, an oscilloscope, a power source and a voltage / current sensor in a positive polarity manner; secondly, trial grinding operation is conducted, after open-circuit voltage is loaded, the grinding wheel moves along the grinding path with specific motion parameters, and the grinding particle exposure height before trimming is determined; thirdly, micro-grinding particle slicking operation is conducted, motion parameters are set again, the pulse discharge voltage is controlled to range from 19 V to 23 V, the grinding wheel circularly moves along the grinding path, the oscilloscope collects pulse discharge signals in real time, and the current grinding particle exposure height and effective grinding particle number are intermittently calculated / updated and are compared with the target value. According to the grinding wheel micro-grinding particle slicking pulse discharge trimming parameter and motion parameter control method, an electrode rotation device is not needed, the rigidity coefficient of the trimmed micro-grinding particles is high, a trimmed face is smooth and flat, exposure is high, homogeneity is good, and mirror face machining of crisp and hard materials can be achieved.

Description

technical field [0001] The invention relates to the technical field of micro-abrasive smoothing of a diamond grinding wheel, in particular to a pulse discharge dressing parameter and motion parameter control method for micro-abrasive smoothing of a grinding wheel. Background technique [0002] The quality of material surface processing in precision grinding depends on the characteristic parameters of diamond grinding wheel abrasive grains. The abrasive grain cutting edge obtained by mechanical dressing is very sharp (the apex angle is generally less than 130°, and the edge height is 20% to 30% of the abrasive grain size), but the equivalence is poor. This can lead to abrasive particle shedding during the grinding process and has a direct impact on surface integrity. The use of non-mechanical contact laser, chemical corrosion and other dressing technologies only increases the height of the abrasive grains, but does not solve the problem of uniformity of the abrasive grains. ...

AI Technical Summary

Problems solved by technology

[0004] 1. The smoothing effect of the abrasive grains is not obvious. For example, using a copper electrode to dress the #46 diamond grinding wheel for 20 hours under the open circuit voltage of DC-25V, the sharpness of the abrasive grains is significantly improved, but its shape basically does not change;

[0005] 2. The molten copper shavings produced during the dressing process are easy to adhere to the surface of the grinding wheel, which affects the abrasive grains coming out of the edge

[0006] 3. The sharpening and trimming effect of abrasive grains is not easy to control, especially in the dressing process, the plowing action of the abrasive grain cutting edge will easily cause the surface of the copper electrode to form a bulge (reduce the discharge gap), and then generate a pulse arc discharge, resulting in grinding The grain surface structure is damaged or falls off directly

[0010] 3. Fine diamond particles need to be fixed on the iron-based disc by electroplating, but the thickness of the electroplating layer provided by the existing technology is less than 1mm, which is difficult to meet the requirement of dressing time

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