Answer Happy

1) In Plastic injection molding the sinking defect can occur if the ribs have a thickness equal to 30% of the nominal thickness; m) The sprue in metal casting has a constant cross section all along; n) In the flat rolling process with the increase of roll radius the roll force will increase: o) Cold forging a metal increases the strength and decreases its ductility; p) In metal rolling process, the roll force is independent from the friction; q) In metal bending process the spring-back will increase if the Young's modulus (E) decreases. r) In the bending process the spring back increases as the yield strength of the metal decreases; s) In plastic injection molding if the rib has a thickness equal to 50% of the nominal thickness of the part sinking will occur in the back of the rib; t) In open die forging, barreling phenomena occurs due to high friction between the die and the part