Abstract
The article deals with drilling machines in which the ratio of the load between the power to rotate and the power to feed is carried out automatically due to the structure of the adaptive machine, with the provision of self-regulation for drilling modes close to optimal. Changing drilling conditions automatically results in a change in the ratio of speed to feed force, providing maximum performance while protecting against sudden overloads, for example, when encountering solid inclusions in the drill rock, or when shading a well. The ratio of frequency of rotation and feed rate determines the specific depth of cut (specific feed) and determines the performance of the working process of the drilling machine. A typical example of such a machine is a drilling machine rotary type with hydraulic rotation and feed. The cutting theory determines the rational drilling conditions, known rational specific feed, rational speed, minimum and maximum feed force, depending on the strength of the material being drilled and the degree of blunting of the cutting tool.The block diagram of such a drilling machine is considered and the analysis of the influence of parameters and characteristics of individual hydraulic elements on the drive setting on the rational mode of operation is given. The research stand and its structure are given, some results of experimental researches are given. It is established that the chokes of the drive settings can adjust the degree of adaptation, change its sensitivity to external influences and change the range of operating conditions for the rational functioning of adaptive drilling.
Published Version
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