STUDY OF THE EFFECT OF THE CORE ROUGHNESS PARAMETERS ON ADHESION PERFORMANCE IN A COPPER-CLAD STEEL WIRE DRAWING OPERATION
A theoretical descriptive method to describe the reference curve across the entire thickness of a rough layer has been elaborated. Considering that the role of microroughness in generation of resulting microgeometry of a contact surface between a sheath and a core may vary at different contact, it is recommended to take an average roughness value for the entire height of a rough layer when doing calculations. Processing of the profile graphs helped identify the microgeometry of a wire core after ultrasonic cleaning and plasma electrolytic stripping. A change of the roughness height and spacing parameters of a core was studied and relationships were identified which can be used to calculate the above parameters by step in a copper-clad steel wire drawing operation. It was established that during a copper-clad steel wire drawing process the change of the spacing parameters of the rough layer is less intense than the change of the height parameters. Conditions were considered for elimination of microroughness at the contact surface of a copper-clad wire. Limitations were identified with regard to the choice of techniques to create the required microrelief on the core surface before drawing. This was done to ensure a complete elimination of microroughness with the help of sheathing and to ensure a tight adhesion between the contact surfaces of a bimetallic wire.