Active Control of the Inside Diameter of Diesel Engine Cylinder Liners during Their Honing

Abstract

The changes in the inside diameter of liners during honing without active control means and with their use are studied. The inner surface of the liner is shown to wear out to a greater extent in its upper part. The causes of wear are indicated. The most common method for restoring a liner is mechanical treatment of the inner surface to an increased size. After boring to an oversize, honing process is shown to be applied. The pneumatic active control system used for honing is described. The method of evaluating the accuracy of the liner processing using the active control system is described. The inner surfaces of the liners processed with and without the active control means are measured. The use of the active control system during honing found to decrease the reject of exceeding the inner size tolerance of the cylinder liner from 45 to 1–2%. The active control system for honing cylinder liners is concluded to increase the processing efficiency by 15% due to the absence of measurement time with stopping processing and to decrease the reject in the inner surface size of the liners to 40%.