Abstract

The screw producing is an important process course. The certain defect is found so this process will be paid attention. In this paper modeling of process is analyzed. With increasing time the force decreases. With decreasing threading length from 350mm to 220mm the force increases from 30N to 50N at the time of 0.2s. It is found that with increasing diameter from 3mm to 4.5mm the force decreases from 55N to 22N at the same timed. With increasing mass from 2.16g to 2.8g the force decreases from 35N to 27N too. Meantime when the time is beyond 0.5s the curves have convergence to one little value of zero from all of figure curves. It explains that when the thread time is shorter than 0.5s the mold can wield big force to thread. If the time is over this value the little force will need to thread process. Do this paper to cause technological engineer’s attention and advice. In general if diameter of screw is high force may decrease. The force is low if mass of screw becomes low. Finally if length becomes low the force may increase. The effective turn to force which affects work hardening is L>d>m in thread process. As to mould and screw produce the regulation shall be proceeded completely. Not only mould but also materials size & mass do we check and consider off in this process.