Gears with gear grinding have the advantages of low transmission noise, high transmission efficiency and long service life. Grinding has been considered as an expensive gear processing tool for aerospace or other high-tech applications. But now, the concept has changed: the efficiency of the gear grinding machine has increased, the performance of the grinding wheel has been better, and the high cost has been greatly reduced. As a result, gear grinding has begun to be applied to gear processing on a large scale, such as the manufacture of automobile and motorcycle gears, and has reached a level of general application. In fact, all first-class automotive gear suppliers have a gear grinding machine in order to remain competitive. In the next two to five years, the automotive industry will gradually become the largest growth market for hard tooth surface processing. Because gear grinding removes heat distortion, many gearboxes use grinding gears to better control drive maneuvers and noise. The grinding process has matured and is growing rapidly throughout the gear industry.

Progress of gear grinding machine

Today's gear grinding machines are much more efficient than the same type of machine tools a decade ago. This comes from a series of major improvements:

1 onboard measurement

Many gear grinding machines have become more accurate thanks to the onboard measurement system. Since the on-machine measurement is used, it is not necessary to remove the gear from the workbench and send it to other places for inspection, thereby avoiding secondary installation errors during rework. During processing, the airborne measurement system first analyzes the gears, and then compares the measured parameters with the theoretical design parameters to determine the required correction amount. After the control system collects these correction data, it automatically adjusts the grinding machining state, and then grinds the teeth. And measurement. This cycle is repeated until the required accuracy is reached. The integrated on-board measurement and on-board correction system make modern gear grinding machines more efficient.

In China, the YK75100 shaped grinding wheel grinding machine of Qinchuan Development Co., Ltd., together with the CEP 1000 top-mounted gear measuring system of Chengdu Tool Research Institute, has successfully tried the open-loop in-machine measurement (measurement of measured data) And control still needs to be done manually). However, in terms of the overall level of the country, the precision of processing and measurement needs to be further improved.

2 direct drive motor

In recent years, the use of compact direct drive motors on the grinding wheel spindle and gear workpiece spindles has increased. The direct drive spindle avoids drive chain errors. Therefore, the use of direct drive motor in the "grinding wheel-grinding gear" cycle, coupled with better grinding wheel and multi-axis linkage control, can eliminate the high frequency error and harmful vibration of cutting grain, partial geometry, gear noise .

3 Automation

The term “automation” is increasingly used in gear grinding, especially in process production, including workpiece mounting, tool change, and inventory sorting in synchronization with workpiece processes. Automation eliminates machine idle time and helps reduce waiting time between processes.

4 gear grinding machine software

Windows-based software, like those used in personal computers, is widely used in today's gear grinding machines (such as Windows-based design systems and CNC systems). Previously, it was only possible to draw on paper. Now, the design and correction software package combined with the graphical interface and the algorithm software can make the gear geometry design programmatic and partial manufacturing simulation.

The high-precision closed-loop control between the drive, the ball screw and the position sensor is realized by the application of the software. Many of the new generation of gear grinding machines are equipped with position sensors that are separate from the drive unit for higher accuracy and thermal stability. The absolute displacement sensor and absolute coding technology ensure high-speed transmission of feedback data and stability of machine tool transmission under the premise of high positioning accuracy.

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