Simulation of adaptive drill machines with hydraulic drive

Abstract

In a number of technological machines, the drive performs two related working movements. As you know, most of the machines used for Metalworking, also have a drive with one or two engines, which provides a working process with two movements of the cutting tool relative to the workpiece or part. As a rule, this is rotational and translational motion. The ratio of the speeds of these movements, or the ratio of the two movements, determines the modes and indicators of the cutting process. This ratio is often optimal. The article deals with the method of modeling the adaptive drilling machine, as an example of studying and analyzing the automatic process of maintaining rational cutting conditions with two related working movements. In this case, the feed force can be greater than the nominal value within the power and strength limitations, or be negative, providing reverse movement of the drill in case of jamming. What is new is that the simulation of the adaptive machine operation process is performed, showing the features of the adaptation process, self-adjustment of the drive to rational cutting conditions, with a change in the strength of the drilled material. In particular, it is possible to configure the adaptive scheme to the required degree of adaptation. Equations and the developed method of the analysis of the adaptive drive executed on the basis of two differentials are given.