Cold Heading
Cold heading process Definition:
Cold rolling is the use of metal plasticity, using cold mechanics for pressure or cold drawing, to achieve the purpose of solid metal deformationThe method of forging the top of a bar or wire at room temperature, the cold head is mainly used to manufacture bolts, nuts, nails, rivets and steel balls.
The forging material may be copper, aluminum, carbon steel, alloy steel, stainless steel, titanium alloy, and the like. Material utilization can reach 80%-90%.
The cutting, hoe, accumulation, forming, chamfering, twisting, shrinking and trimming processes can be sequentially performed on the cold heading machine.
High production efficiency, up to 300 pieces / min, the diameter of the largest cold heading workpiece is 48mm
Surface treatment can be:
Cold heading process:
Pan Yuan-annealing-pickling-drawing-head-heading-heat treatment-plating-packaging
Pan Yuan: refers to the wire bought back(Pan Yuan: refers to the materials bought back)Annealing: increase the hardness of the wire itself
Pickling: wash away the rust, impurities and the like on the surface of the wire.
Draw line: Pull the wire to the diameter you need to produce the bolt
Head: It is the head of the extruded bolt that is formed by cold heading.
Bolts above M20 need to be red and heated to hit the head.
Tooth rolling: refers to the required distance and shape
Heat treatment: This process is more important to determine the performance level of the bolt
Plating: treating the surface to the desired color
Cold line screw line nail line steel ball line
