The Study On Quasi Adaptive Control In Milling Special Spiral Rod

The envelope method of processing special spiral rod is more efficient than others but it cannot satisfy the requirement of the clients. This paper brings up a quasi-adaptive control system of this processing on the basis of cybernetics and improves the efficiency by adjusting the operating parameters according to the control rules with the cutting precision satisfied.In the process, the signals, which can reflect the cutting state, such as cutting power, vibration and acoustic emission, all change periodically, the variety is related to the sectional shape of the workpiece. All kinds of signals analyzing, this paper uses the cutting power to inspect the process. Cutting power is easy to detect and implement.A calculation method for the cutting quantity of the abnormal spiral rod has been introduced in this paper. The cutting area and the cutting power were calculated. At last the relationship between the power and the feed velocity has been available, which provides a dependency for how to improve the throughput by adjust the feed velocity. Adjusting the feed velocity is to adjust feed rate while respecting the cutting power constraint.The modification of feed rate must influence the quality of workpiece, so when adjust feed rate must respect the roughness of workpiece. In this paper, a calculation method for the roughness of the abnormal spiral rod has been introduced. The relationship between the roughness and the feed velocity has been available.The system is to adjust the feed velocity while respect the cutting power and roughness constraint. It can improve the efficiency effectively and it is the same with diversified NC machine tool. This is a exploration in the field of control of processing special spiral rod.