Improving the efficiency of setting up a five-axis CNC machine in processing of helical gears using a three-dimensional probe

Abstract

The most universal method of gear cutting is the method of processing the gear rims of wheels with a universal tool-disk cutters. The main dimension parameter of the gear ring, which is key for ensuring the efficiency of the gear train, is the length of the overall normal. Accurate determination of this parameter is possible only if withdrawal after trial machining and measuring it on a dedicated co-ordinate measuring machine, lost time for the process measurement details, there is a risk of adjustment in marriage. The article considers a method for measuring the length of the General normal of a skewed cylindrical wheel, which allows obtaining its exact value without removing the part after gear processing and measuring this parameter if only one cavity of the gear wheel is processed. Measurements are made using a three-dimensional linear measurement probe. Formulas for calculating the length of the General normal are given, which allow calculating the value of the length of the General normal based on the data of a three-dimensional probe. Comparison of the measurement data of gears with a three-dimensional probe and a specialized CNC gear measuring machine allows us to conclude that the measurement accuracy is sufficient in comparison with the accepted tolerance for the length of the General normal. The introduction of the method of measuring the length of the common normal with a three-dimensional indicator allowed to completely eliminate the probability of commissioning defects and reduced the complexity of carrying out machine changeovers in the mode of single and small-batch processing of gears.