Experimental Study of Surface Quality during Treatment of Cylinder Assemblies of Drilling Pumps

This article discusses the impact of machining the actuating surfaces of mud pump liners. As a structural material, gray cast iron is used, which is subjected to surface strengthening by alloying in contact with a mixture of oxides. As a result, a layer with special properties is formed on the actuating surface of the sleeve of the drilling pump cylinder. A distinctive feature of the layer is the reverse nature of the hardness distribution (hardness increases along the depth of the layer). There is also pure ferrite on the surface (the thickness of which can be controlled by the composition of the saturating mixture). Studies of the process of machining parts with the specified surface configuration were carried out. A complete factor experiment was planned and performed. As a result of data processing, dependencies were obtained to determine the arithmetic mean deviation of the profile from technological modes. The obtained dependencies can be used to assign finishing modes to parts, including cylinder bushings of drilling pumps.