Jamming of hand-operated riveter - the problem and solving it in process of modelling

During the exploitation of hand rivet tools, abnormal situations arise due to the jamming of the used mandrel (core) in the actuating mechanism, leading to an increase in process time. The main purpose of the article is establish of hand rivet tools teeth parameters to eliminate self-braking of the used mandrel (core) in the actuating mechanism. Parameters of the rivet tools teeth are determined by force analysis. The limit equilibrium conditions by the modeling process of rivet tool exploitation were obtained. The strength conditions are determined by force dependencies. The condition of self-braking of the used mandrel (core) in the hand rivet tool jaws is determined. As a result of numerical simulation, the recommended values of the angles of inclination of the teeth front surface of the rivet tool jaw, which are eliminate jamming of used mandrel (core) in the actuating mechanism, are obtained. The recommended values of the angles of inclination of the teeth front surface of the rivet tool jaw should not be less than 32 degrees.