Máquina automática para corte ajustável de condutores elétricos

Abstract

This work proposes the design and assembly of an automatic equipment for adjustable cutting of flexible cables with gauge from 0.5 mm² to 1.5 mm². The project involves: structural mechanics of the equipment, electrical control circuit and user communication, microcontroller programming and product validation. The main structure of the equipment is made of steel, with turned, welded and screwed parts. There is a system with two axes, a bearing, two springs and a motor that pulls the cables. A blade attached to the tip of a piston makes the cut of the electrical conductor. The main frame is fixed to a wooden base. The machine is controlled by the PIC16F877A microcontroller fixed on a printed circuit board to carry out communication with sensors, buttons, actuators and display. Communication with the user is via 4 buttons and a 16x2-position liquid crystal display. Cable displacement is measured by an encoder sensor. The piston stroke is defined by optical sensors. The microcontroller is programmed in C and has a sequential algorithm to command the equipment. A machine validation methodology was applied, which proved to have an average error close to 7 % in relation to the requested length.