Upsetting and cold extrusion are basically deformation processing under the same conditions, but the operation methods are different. Cold forging belongs to the forging deformation of smaller workpieces and is often used in the fastener industry. Cold extrusion is the extrusion deformation of larger workpieces and has a wide range of uses.

 

What is cold extrusion

 

Cold extrusion is a processing method in which the metal blank is placed in a cold extrusion die cavity, and at room temperature, pressure is applied to the blank through a punch fixed on the press to plastically deform the metal blank to produce parts. Obviously, cold extrusion Press processing relies on molds to control the flow of metal, and relies on a large amount of metal volume transfer to form parts. In terms of extrusion equipment, my country has the ability to design and manufacture extrusion presses of various tonnages. In addition to general mechanical presses, hydraulic presses, and cold extrusion presses, friction presses and high-speed and high-energy equipment have been successfully used for cold extrusion production.

 

If the blank is extruded without heating, it is called cold extrusion. Cold extrusion is one of the machining processes of non-chip and less-chip parts, so it is an advanced process method in the plastic processing of gold chips. 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 chips and no chips.

 

Cold extrusion technology is a high-precision, high-efficiency, high-quality and low-consumption advanced production technology, which is mostly used in the large-scale production of small and medium forgings. Compared with hot forging and warm forging processes, it can save 30%-50% of materials, save energy of 40%-80%, and can improve the quality of forgings and improve the working environment.

 

At present, cold extrusion technology has been widely used in fasteners, machinery, instrumentation, electrical appliances, light industry, aerospace, shipbuilding, military industry 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 forgings.

 

Cold extrusion is also divided into forward extrusion, reverse extrusion, compound extrusion, radial extrusion and so on.

 

What is cold heading

 

The cold heading process is one of the new processes of metal pressure machining with little and no cutting. It is a processing method that uses the plastic deformation of metal under the action of external force to redistribute and transfer the metal volume with the help of a mold 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 dedicated cold heading machine. If the production volume is not too large, crank press or friction press can also be used instead.

 

Because of its high productivity, good product quality, and greatly reducing material consumption, lowering production costs, and improving working conditions, cold heading technology is more and more widely used in mechanical manufacturing, especially in the production of standard fasteners. The most representative products produced by multi-station cold heading machines are bolts, screws and nuts.

 

Are cold heading and cold extrusion the same thing?

 

Cold forging and cold extrusion are basically deformation processing under the same conditions, but they are different in operation. Cold forging belongs to the forging deformation of smaller workpieces and is often used in the fastener industry. Cold extrusion is the extrusion deformation of larger workpieces and has a wide range of uses; cold heading is equivalent to a branch of cold extrusion. Simply put, in the process of making bolts, the hexagonal head forming is cold heading, and the rod is reduced. The diameter is cold extrusion (positive extrusion). Non-trimmed hexagonal flange bolts (multi-station forming) have both cold heading and cold extrusion. The front shape of the hexagonal nut is only cold headed, and the latter process is cold extrusion (positive and negative extrusion).