Željko Ivandić

New Approach of Recycling of Abrasives for Water Jet Cutting

The recycling or reuse of material in production becomes as a saving task for sustainable and environmental competitive production. Sustainability means not only achieving cost efficient process but also eco efficient. The design of the abrasive recycling system is desirable because of the growing growth and development of the abrasive water jet cutting industry. The use of recycled abrasives greatly reduces production costs, and hence the price of products resulting from such processing and increases competitiveness. There is a large space for wide application of cutting technology with abrasive water jet, and thus the application of abrasive recycling. On the environmental side it is very important to have a controlled disposal of the abrasive used.

Analysis of Modification of Spur Gear Profile

The article presents an analysis of the modification of the toothing of spur gears. The aim of the modification of the profile on the tooth tip is to compensate for the tooth deflection under loading and to improve the conditions of gear operation. Cases of longitudinal toothing modification of a convex-convex (Cv-Cv type) tooth are described, where the tooth is biconvex and the gear teeth are convex-concave (Cv-Cc type). The conditions of mating of modified gears have been analyzed. A method of machining gears by the step-by-step method has been proposed, which can be used in unit machining of large-module gears with an arbitrary profile modification system.