Experimental study of the cutting conditions effect on surface roughness when boring a stepped hole

Abstract

The article presents the results of a study carried out to ensure the quality of boring stepped holes of a large part of the NP8 submersible pump bed. A design was developed and a prototype of a special combined boring tool was manufactured. A sample was also made, a blank of SCh15 for carrying out experimental studies.

Experimental studies were carried out in the laboratory base "Center of Working Professions Mechanical Engineering" of A. Saginov Karaganda Technical University NJSC on a screw-cutting lathe 1K625.

As a result of experimental studies of the cutting conditions effect on the roughness of the machined surface when boring stepped holes, it was established that with increasing the spindle speed and the value of the cutting depth, the quality of the machined surface improves. Increasing the feed negatively affects the machined surface roughness. The optimal cutting conditions for machining stepped holes ∅295 mm and ∅325 mm of the NP8 submersible pump bed were determined as follows: S=0.26 mm/rev; n= 1250 rpm; t=1.0 mm.

As a result of planning the experiment and evaluating the obtained data using the ANETR-5 program, the dependence of surface roughness on cutting modes was obtained, which will make it possible to control the quality parameters before machining and to determine optimal cutting modes that ensure high quality parameters of the part.