What is the difference between cold heading and cold extrusion

What is the difference between upsetting and cold extrusion? Cold upsetting and cold extrusion are basically deformation processing under the same conditions, but their operation modes are different. Cold heading belongs to forging deformation of smaller workpieces, which is commonly used in fastener industry. Cold extrusion belongs to the extrusion deformation of larger workpieces, which is widely used.

What is cold extrusion?

Cold extrusion is the processing method of making parts by placing metal blanks in the cold extrusion die cavity and applying pressure to the blanks through the punch fixed on the press at room temperature to make the metal blanks plastic deformation. Obviously, the cold extrusion process relies on the die to control the metal flow and relies on a large amount of transfer of metal volume to form parts. In terms of extrusion equipment, China has the ability to design and manufacture various tonnage extrusion presses. In addition to general mechanical press, hydraulic press and cold extrusion press, friction press and high-speed high-energy equipment are also 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 for non chip and less chip parts, so it is an advanced processing method in metal chip plastic machining. 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 little chip.

Cold extrusion technology is an advanced production technology with high precision, high efficiency, high quality and low consumption, which is widely used in the large-scale production of small and medium-sized forgings. Compared with hot forging and warm forging, it can save 30%~50% of materials, save 40%~80% of energy, 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 one of the indispensable and important processing methods in metal plastic bulk forming technology. With the progress of science and technology and the continuous improvement of technical requirements for products in automobile, motorcycle, household appliances and other industries, cold extrusion production technology has gradually become the development direction of refined production of small and medium-sized forgings.

Cold extrusion also includes forward extrusion, backward extrusion, compound extrusion, radial extrusion, etc.

What is the difference between cold heading and cold extrusion

What is cold heading?

Cold heading process is one of the new processes for metal pressure machining with little or no cutting. It is a processing method that makes use of the plastic deformation of metal under the action of external force, and makes the metal volume redistribute and transfer by virtue of the mold, so as to form the required parts or blanks. Cold heading technology is most suitable for producing standard fasteners such as bolts, screws, nuts, rivets, pins, etc. The common equipment for cold heading process is a special cold heading machine. If the production is not too large, it can also be replaced by crank press or friction press.

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

What is the difference between cold heading and cold extrusion

Is cold heading and cold extrusion the same thing?

Cold pier and cold extrusion are basically deformation processing under the same conditions, but the operation mode is different. Cold heading belongs to forging deformation of smaller workpieces, which is commonly used in fastener industry.

Cold extrusion belongs to the extrusion deformation of larger workpieces, which is widely used; Cold heading is equivalent to a branch of cold extrusion. In the process of making bolts, hexagon head forming belongs to cold heading, and rod diameter reduction belongs to cold extrusion (forward extrusion). Non trimming hexagon flange bolts (multi station forming) have both cold heading and cold extrusion. Before the forming of hexagon nuts, only cold heading is used for shaping, while the following process of hole extrusion belongs to cold extrusion (forward and backward extrusion).