Which process involves shaping materials over molds?

Moulding is the process that specifically involves shaping materials by using molds. In this technique, a material, typically in a liquid or pliable state, is poured or pressed into a pre-formed mold. This mold defines the desired shape of the final product, allowing for intricate designs and specific dimensions. Once the material solidifies or cures, it takes on the shape of the mold, making moulding an essential method in manufacturing processes such as casting in metals and plastics, and creating components like automotive parts or toys.

The other processes mentioned, while important in their own right, do not primarily focus on shaping materials using molds. Bending refers to altering the shape of a material by applying force, which does not involve a mold. Cutting involves removing material to achieve a desired shape or size but does not form an item in a mold. Rapid Prototyping is a method for quickly creating a scale model or prototype of a physical part or assembly, often using techniques like 3D printing, but it does not specifically involve the use of molds in the traditional sense associated with moulding.