The digital closed-loop manufacturing technology of end face spiral gear coupling is to organically combine the numerical control processing technology and digital detection technology of the end face spiral gear coupling through the central computer to form a new closed-loop processing technology of the end face spiral gear coupling with the function of automatic feedback and automatic correction of tooth profile error, which makes full use of the precision detection function and the middle of the gear measuring center The tooth profile error correction function of the central computer improves the intelligence of the machining process, as well as the tooth surface accuracy, meshing quality and production efficiency.
Based on Windows platform, using visual basic and FORTRAN programming software, the design, analysis, grinding parameter calculation and tooth profile error correction software of end face spiral gear coupling are developed and installed in the central computer. The software has modules of gear blank design parameter calculation, gear grinding processing parameter calculation, tooth surface coordinate parameter calculation, tooth profile error correction calculation and so on.
Based on the central computer, CNC gear grinding machine and gear measuring center, the digital closed-loop manufacturing system of end face spiral gear coupling can be constructed. The steps of realizing digital closed-loop manufacturing with the system are as follows:
(1) Through the software module of the central computer, the tooth blank design parameters and grinding processing parameters of the end face spiral gear coupling are calculated, and the calculated processing data are transmitted to the CNC gear grinding machine for gear grinding of the end face spiral gear coupling. Then the space coordinates and normal vectors of each point on the theoretical tooth surface are calculated by using the tooth surface coordinate parameter calculation module, and these data are transmitted to the gear measuring center, so as to detect the tooth profile error of the actual tooth surface by using the gear measuring center.
(2) The gear measuring center is used to detect the tooth profile error of the actual workpiece, and the tooth profile error measurement data of each point on the actual tooth surface is obtained, and whether the part is qualified is judged according to the error value (generally, the maximum tooth profile error of aviation end face spiral gear coupling is less than 4 μ m). If it is unqualified, enter step (3).
（3） The measurement data of tooth profile error is transmitted to the central computer. By using the tooth profile error correction calculation module, the adjustment parameters of the machine tool and the grinding wheel parameters for correcting the tooth profile error are calculated. The corrected data are transmitted to the CNC gear grinding machine through the central computer again. The machine adjustment parameters and grinding wheel parameters are modified according to the correction data, and the workpiece is grinded again. Repeat step (2) and step (3) until the workpiece is qualified. Generally, one or two times can ensure that the tooth profile error of the workpiece meets the requirements. After the first workpiece is qualified, the workpieces of the same batch are processed with the modified machine tool adjustment parameters and grinding wheel parameters.
Compared with the traditional manufacturing mode, the digital closed-loop manufacturing technology of end face spiral gear coupling has the following advantages:
(1) The tooth surface has high precision and stable quality. In the traditional manufacturing mode, high-precision gauges are used to detect the end face spiral gear coupling by coloring method. However, when the coloring style is unqualified, it is difficult to identify the root cause of the problem according to the coloring style. Moreover, the gear tooth surfaces processed in different batches have great differences and the quality is unstable. By using the digital closed-loop manufacturing technology, the tooth profile error can be automatically corrected, and the tooth surfaces of different batches of workpieces processed are consistent with the theoretical tooth surfaces, thus realizing complete interchangeability.
(2) High processing efficiency. The tooth profile error correction process of traditional manufacturing mode depends on the judgment standard and practical experience of technicians, and the production efficiency is low. The digital closed-loop manufacturing technology can quickly and accurately obtain the adjustment parameters of machine tool and grinding wheel to correct the tooth profile error according to the link of tooth surface detection and automatic error correction, which reduces the times of trial cutting adjustment and improves the processing efficiency. At the same time, the use of digital closed-loop manufacturing technology can eliminate high-precision gauges and reduce manufacturing costs.