Cold heading and cold extrusion are basically deformation processing under the same conditions, but they are different in operation. Cold pier is a forging deformation of smaller workpieces and is often used in the fastener industry. Cold extrusion belongs to the extrusion deformation of larger workpieces and has a wide range of uses.
01
what is cold extrusion
Cold extrusion is to put the metal blank in the cold extrusion die cavity, and at room temperature, apply pressure to the blank through the fixed punch on the press to make the metal blank produce plastic deformation and make parts. Obviously, cold extrusion Press processing relies on molds to control metal flow, and forms parts by transferring a large amount of metal volume.
If the blank is extruded without heating, it is called cold extrusion. Cold extrusion is one of the chip-free and chip-less parts processing techniques, so it is an advanced process method in metal chip plastic processing. If the blank is heated to a temperature below the recrystallization temperature for extrusion, it is called warm extrusion. Warm extrusion still has the advantage of less and no chips.
Cold extrusion technology is an advanced production technology with high precision, high efficiency, high quality and low consumption. It is mostly used in the large-scale production of small and medium-sized forgings. Compared with hot forging and warm forging processes, it can save 30% to 50% of materials and 40% to 80% of energy, and can improve the quality of forgings and improve the working environment.
At present, cold extrusion technology has been widely used in fasteners, machinery, instruments, electrical appliances, light industry, aerospace, shipbuilding, military and other industrial sectors, and has become an indispensable and important processing method in metal plastic volume forming technology. one. With the advancement of science and technology and the continuous improvement of product technical requirements in industries such as automobiles, motorcycles, and household appliances, cold extrusion production technology has gradually become the development direction of refined production of small and medium-sized forgings.
Cold extrusion is also divided into forward extrusion, reverse extrusion, composite extrusion, radial extrusion and so on.
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02
What is cold heading
The cold heading process is one of the few new processes for non-cutting metal pressure processing. It is a processing method that uses the plastic deformation of metal under the action of external force, and with the help of molds, redistributes and transfers the metal volume to form the required parts or blanks. The cold heading process is most suitable for the production of standard fasteners such as bolts, screws, nuts, rivets, and pins. The equipment commonly used in the cold heading process is a special cold heading machine. If the production volume is not too large, it can also be replaced by a crank press or a friction press.
The cold heading process is more and more widely used in mechanical manufacturing, especially in the production of standard fasteners, due to its high productivity, good product quality, and greatly reduced material consumption, reduced production costs, and improved working conditions. The most representative products produced by multi-station cold heading machines are bolts, screws and nuts.
03
Are cold heading and cold extrusion the same thing?
Cold pier and cold extrusion are basically deformation processing under the same conditions, but they are different in operation. Cold pier is a forging deformation of smaller workpieces and is often used in the fastener industry. Cold extrusion belongs to the extrusion deformation of larger workpieces, and has a wide range of uses; cold heading is equivalent to a branch of cold extrusion. The diameter belongs to cold extrusion (positive extrusion). Non-cutting hexagonal flange bolts (multi-station forming) have both cold heading and cold extrusion. The front shaping of hexagonal nuts is only cold heading, and the subsequent process of extrusion is cold extrusion (positive and reverse extrusion).
