Abstract: An injection mold of motor canteen rear covers with threads was designed using UG NX software. Gating system, cooling system, and demolding mechanism were designed and calculated. With the electric motor, gears rotating transfers the power to mold core, and the plastic parts could be demolded successfully. This mold was suitable for stable, high quality, high efficiency production.

Key words: thread plastic part, demolding, injection molding process, mold design