Análise de forças aplicadas por mecanismo pneumático na inspeção de pinos soldados

Abstract

Inside a manufacturing plant, one of the biggest problems is time spent on rework and inspection. The weld of stud, or Stud Welding, has low confiability and repeatability. The instability and interferences on the power lines, even low, cause oscillation on the manufacturing process which impacts the quality of the product. These variations on the process make necessary, in most cases, the inspection of all welded studs. The inspection is largely performed manually by devices in which the force applied to the stud relies on the operator that performs it and his experience. In order to standardize the force applied to the stud by the operator and to make the inspection faster, this works proposes the sizing of a pneumatic device that enables the inspection even with the welding jig positioned over the welded part. The forces applied on the welded stud, which depends on the pressure inside the pneumatic cylinder, are determined so that a stress equivalent to the stress caused by a screwdriver is obtained through the proposed device. The device was modeled in SOLIDWORKS®, the forces were analyzed using the principle of virtual work, through the program MATHCAD®, and the stresses were analyzed using the finite element method, through the program ANSYS®. The stresses generated through the proposed device were analyzed and compared to the stresses caused by a screwdriver using the Von Mises failure criterion.