cold extrusion processing and CNC machining
The Traditional Production Process Of Mining Bits: The traditional production of the mining bits included the hot-forging of the blanks after mechanically cutting the workpiece. Using the medium-frequency induction heating, blanks are heated to about 1000 degrees Celsius to forge the head of the mining bits. Even today, there are some mining bits manufacturing still using the same method.
After forging, the workpiece has to go through the process of the fire treatment. This is to eliminate the workpiece's tissue defects, refine the grain, reduce quenching deformation, to crack, etc. The manufacturing process is quite long, and it lacks material utilisation. The size accuracy of the product is poor, and the labor intensity of the workers is high. This results in higher production costs of mining bits, and the utilization rate of materials is reduced.
Cold Extrusion of Mining Bits: Cold extrusion is the processing method of putting metal blanks in a cold extrusion mould cavity, at room temperature, applying pressure to the blanks through the convex mould fixed by the press so that the metal blanks produce plastic deformation and make parts. The process of producing cold-extruded mining bits is pre-formed for positive extrusion and eventually forged. It has the characteristics of high production efficiency, high product precision, and high material utilization rate.