What are the key technologies and processes in the manufacturing process of tungsten steel round bars?

Tungsten steel round bar is a kind of high hardness and high strength metal material, which is widely used in automotive, aerospace, electronics, medical and engineering machinery. Its manufacturing process involves a number of key technologies and processes, which are described in detail below.

1. Selection of raw materials: the main components of tungsten steel round bar are tungsten and other alloying elements. The higher the purity of tungsten and the lower the impurity content, the better the performance of the round bar. Therefore, raw material selection is the first step in the manufacturing process. Usually tungsten powder and other alloy powders are mixed and moulded into cylinders by pressing.

2. homogeneous mixing: tungsten powder and other alloy powders are mixed according to a certain ratio, the purpose is to evenly distribute the alloying elements to improve the degree of alloying. The mixing can be done by mechanical grinding or ball milling.

3. pressing and forming: the mixed powder into the mould for pressing and forming. There are two methods of pressing moulding, one is isostatic pressing method, i.e. the powder is filled into the mould, and then it is evenly compacted by the press. The other is the isothermal pressing method, i.e., the mould is heated and pressed at a constant temperature.

4. Sintering: After pressing and moulding, the round bar needs to be sintered. Sintering is the process of placing a round bar in a sintering furnace at a specific temperature to cause the powder particles to combine and form a dense billet. The temperature and time of sintering needs to be regulated according to the specific alloy composition and requirements.

5. Precision grinding: The sintered round bar is subjected to precision grinding to remove the oxide skin and roughness on the surface and to improve the surface quality and dimensional accuracy of the round bar. Precision grinding can use grinding machine, polishing machine and other equipment.

6. Drawing of long rods: Ground round rods are drawn by means of a drawing machine so that their diameter is gradually reduced while their length is increased. Drawing can be done by repeating the operation several times until the required size and length are achieved.

7. Heat treatment: Heat treatment is one of the important processes for tungsten steel round bars. Heat treatment includes two processes: annealing and hardening. Annealing is to heat the round bar to a certain temperature, hold it for a period of time, and then cool it slowly. The annealing process can eliminate the stress inside the round bar, improve the organisational structure, and improve the toughness of the material. Quenching is to heat the round bar to a critical temperature and then cool it rapidly to harden the steel quickly. Quenching improves the hardness and wear resistance of round bars.

8. Surface treatment: Surface treatment is to improve the corrosion resistance and decorative effect of tungsten steel round bars. Common surface treatment methods include galvanisation, chromium plating and spraying.

9. Testing and quality control: Tungsten steel round bars need to be tested several times during the manufacturing process to ensure that the products meet the specified quality standards. Common testing methods include dimensional measurement, chemical composition analysis, mechanical property test, etc.

10. Finishing: After the above process, the obtained tungsten steel round bars can be finished. Finishing includes turning, milling, drilling, grinding and other operations to obtain products that meet the requirements.

To sum up, the manufacturing process of tungsten steel round bar involves a number of key technologies and processes, such as raw material selection, homogeneous mixing, pressing and forming, sintering, precision grinding, long bar drawing, heat treatment, surface treatment, testing and quality control, and finish machining. The mastery and application of these technologies and processes are of great significance to ensure the quality and performance of tungsten steel round bars.