Tungsten Carbide Bar adopts powder metallurgy process, which is mainly made of mixed metal powder after grinding (such as grinding, wet grinding and ball milling), pressing and sintering. Its size and specification can be customized. Tungsten Carbide Round Rod is often made into welding drill bits, mining tools, cutting tools and metal molds, etc. It is very suitable for heavy industries with harsh conditions such as petrochemical, mining, metallurgical manufacturing, wood industry and chemical processing.
Step 1: Mix metal powders, including tungsten carbide powder and cobalt binder powder.
Step 2: Ball Milling
Put the combined tungsten carbide powder, cobalt powder and doping materials on the ball mill for wet ball milling, the process may take 16 to 72 hours In order to prevent mutual contamination between raw materials, it is carried out in different systems before combining Ball milling, sieving and granulation.
Step Three: The Spray Drying Process
The powder is transformed into an excellent homogeneous particle size with excellent flow ability during the spray drying process. Therefore, the dimensional variation of the sintered compact is significantly reduced. In order to ensure the complete cleanliness of the material, a dry spray is sprayed on the prilling tower. After the mixing process is complete, the powder is sprayed in dry air to produce a granular or dry powder.
Step 4: Extrude
The extrusion process is a key link in the production of tungsten carbide rods, and is used to manufacture rods of various shapes and sizes, including spiral varieties, with or without axial perforations. Achieving a uniform shape requires automated extrusion equipment and a high level of technical expertise. It requires pouring a dry mixture of a specific grade and a certain proportion of molding plasticizer into a twin-screw mixer, and then repeatedly rolling and stirring the material within a specified time. After 2.5-3 hours of milling, the plasticized mixed blank forms a uniform sphere.
Step 5: Tablets
Turning, milling, drilling and cutting are all processes that can be performed on the blank to machine the part to net shape according to the customer's drawing.
Step 6: The Drying Process
A vacuum drying oven is utilized at this stage of the process to remove the plasticizer from the billet.
Step 7: Sintering
Heat treatment at a temperature of 1500 degrees Celsius for 15 hours. Heated cobalt and tungsten carbide particles go through a sintering process that bonds them together. The process of processing the powder mixture in the sintering furnace achieves two goals: first, volume reduction to achieve the required tolerances, and second, the transformation of the powder mixture into a new metallic material in the form of cemented carbide. At this stage, the product has reached the desired hardness level. We will use a measuring machine to thoroughly check the dimensions of the blades before proceeding to the subsequent stages of production.
Step 8: Additional Processing
To achieve h6/h5 precision tolerances, most rod blanks need to be centerless ground. In addition, we can also provide long cutting, chamfering, slotting, cylindrical grinding and other services for customers with special requirements.
Step 9: Check
To guarantee quality and performance, the basic quality of raw materials, RTP and raw sintered parts are checked and analyzed in our laboratory. We will conduct a series of comprehensive inspections. For example, test the straightness, size and physical properties of objects, etc.
