Patent ID: 6986203

Claim:
A manufacturing method for a composite coil spring comprising the following steps: preparing a mold that includes a first connecting seat, a first cylinder connecting to the first connecting seat, a second cylinder partially movably received in the first cylinder, a mandrel movably received in the second cylinder and the first cylinder, and a second connecting seat mounted to the second cylinder opposite to the first connecting seat; spirally winding a coil former around the mandrel to define a coil groove; winding composite material pre-preg on the mandrel such that the composite material pre-preg is disposed in the coiled groove defined by the coil former; inserting the mandrel with the coil former and the composite material pre-preg into the first cylinder, the coil former and the composite material pre-preg being received between the mandrel and an inner periphery of the first cylinder, moving the second connecting seat and the second cylinder toward the first connecting seat to compress the coil former and the composite material pre-preg when the mold is heated; opening the mold by moving apart the second connecting seat from the first connecting seat with the second cylinder and the mandrel so as to withdraw the coil former and composite material pre-preg from the first cylinder; and longitudinally drawing out the mandrel from the composite material pre-preg and the coil former by pulling the second connecting seat and the second cylinder, detaching the coil former from hardened composite material pre-preg.