Gear machining apparatus and gear machining condition setting device

摘要

A gear machining condition setting device receives a feeding amount determining parameter and a cutting speed determining parameter. A storage unit stores a cutting-in amount calculation formula representing a relation between a cutting-in amount and a characteristic value determined based on a feeding amount and the feeding amount determining parameter. The feeding amount of the hob, corresponding to the cutting-in amount, is computed using the cutting-in amount calculation formula. Further, the storage unit stores data of a constant temperature curve representing a relation between the cutting-in amount and the cutting speed where a cutting edge of the hob is set at a predetermined temperature. Using the data, the cutting speed is computed based on the cutting-in amount and the cutting speed determining parameter with reference to the constant temperature curve.

主权项

1. A gear machining condition setting device for outputting a machining condition in cutting a gear workpiece using a hob, the gear machining condition setting device comprising:
a parameter receiving unit configured to receive
a feeding amount determining parameter containing a specification of the hob and a specification of the gear workpiece, anda target temperature of a cutting edge of the hob during machining; a first storage unit configured to store a cutting-in amount calculation formula representing a relation between a computed cutting-in amount per a cutting blade of the hob and a characteristic value determined by the feeding amount determining parameter and a relative feeding amount of the hob with respect to the gear workpiece; a second storage unit configured to store a cutting-in amount upper limit per the cutting blade of the hob preliminarily set by the specification and a material of the gear workpiece; a feeding amount computing unit configured to compute a feeding amount of the hob using the cutting-in amount calculation formula based on a selected cutting-in amount, the selected cutting-in amount being selected as one of the computed cutting-in amount obtained from the cutting-in amount calculation formula and the cutting-in amount upper limit; a third storage unit configured to store data of a constant temperature curve representing a relation between the cutting-in amount and a cutting speed where the temperature of the cutting edge of the hob is set to be a predetermined temperature; and a cutting speed computing unit configured to compute the cutting speed corresponding to the selected cutting-in amount by referring to a curve of the target temperature of the cutting edge of the hob in the constant temperature curve, the gear machining condition setting device being configured to output a signal indicating the computed feeding amount and cutting speed to a numerical control device that is arranged and configured to control a gear machining device having the hob.