This invention proposes a single-blade, multi-line sleeve-type shearing and limiting structure, including a cutter motion
assembly and a distance adjustment
assembly. The cutter motion
assembly contains a slidable slider and a pre-upsetting needle, with a follower on the side of the slider. The distance adjustment assembly is fixed to the equipment and has limiting step surfaces of varying heights along the cutter's
lateral movement path. During operation, the cutter's
lateral movement drives the follower to move along the step surfaces, forcibly adjusting the axial position of the pre-upsetting needle to form a rigid, variable-depth
blind hole for stopping material. Combined with the overfeeding and slippage
elimination strategies of the wire feeding mechanism, the pre-upsetting needle acts as a stop to eliminate feeding errors. This invention solves the problems of poor accuracy and unstable product volume caused by traditional cold heading machines relying on feeding
pulse control for length. It achieves high-precision shearing and automatic avoidance ejection with a single blade and multi-line, significantly improving the forming quality of composite contacts.