The key copy model is a device for car locks with lost original keys. Read and record the number of teeth after opening with Lee's reading technology. According to the arrangement and combination of tooth numbers, the corresponding products are modularized and assembled into temporary keys, which are installed on the key machine and directly compiled and copied into new keys.

When casting molds, the master must first prepare a sample of wooden molds or automobile parts. The model made according to a certain proportion is called "copying model", which is often used as a mother model or an auxiliary model to show the machining trajectory of milling machine in copying machining. The copying finger on the copying milling machine moves along the contour shape of copying, and the milling cutter mills the mold material according to the movement of the copying finger to copy the required mold cavity.