Flexible gear grinding machines Bianco （灵活的磨齿机比安科）.pdfVIP

Flexible gear grinding machines In recent years some extremely innovative gear grinding machines have come onto the market both in terms of how they are constructed and of how they operate. It is a well-known fact that the two main gear grinding techniques used today are grinding using a form wheel (the profile grinding method) and grinding using a worm wheel (the continuous generating grinding method). There are advantages and disadvantages with both of these methods which may influence production times, accuracy, surface quality of the ground tooth and so on. With this new generation of machinery, however, it is now possible to choose which method to utilise and even to alternate between the two methods within the same cycle and on the same gear. There are consequently notable reductions in grinding times and the overall quality of the gear produced is better. The most important gear finishing methods are: Shaving Profile grinding Continuous generating grinding Hob skiving External honing (shave grinding) Internal honing Gear shaving is until now the most convenient in term of cost, but the great limit of this technology is that we must shave before heat treatment. Therefore the accuracy of the finished gear many time is not acceptable because the heat treatment produces some distortion. Involute profile and helix shape can lose 1 or 2 DIN class of accuracy. Today grinding operation is more and more used for to produce high quality gears, especially for low noise gear boxes and gear speed reducer. The most established grinding methods are:: Continuous generating grinding with a worm wheel Profile grinding with a form wheel The following point must be considered when we must choose a grinding machine. It is possible to use either ceramic or CBN grind