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How to manufacture tungsten carbide ball?

Posted by: William 2021-10-07 Comments Off on How to manufacture tungsten carbide ball?

 As an professional tungsten carbide ball manufacturer, firstly, let us introduce the uses of TC ball. Tungsten carbide ball are used for making precision parts, precision bearings, instruments, pen, spray machine, water pump, mechanical parts, sealing valve, oil field. The common grade are YG6, YG6X, YG8, YN6, YN8, YN10, YN13 etc. We can supply it from φ0.3mm to φ95.5mm.
Now please allow us to introduce how to manufacture tungsten carbide ball. 
1. Making the Tungsten Carbide Raw Material
When a mixture of powdered tungsten metal and carbon powder are raised to a very high temperature by an arc of electricity, while the whole mass is held in a carbon crucible, there is a complete chemical combination of the two elements to form a big lump of tungsten carbide ( WC ). This lump is crushed several times and then milled to form a fine powder. The powder is screened down to uniform particle sizes.
2. Chemical Analysis
Making spectrographic chemical analysis of Tungsten Carbide can be difficult and uncertain, so the accepted procedure is to use a magnetic permascopic evaluation. If anyone tells you that they can analyze tungsten carbide to an exact figure, ask them for the error budget on their process. If they know the uncertainty, it will be in percentage points. The same exactness of chemistry and physical properties in tungsten carbide that are experienced with alloy metals cannot be expected, as T.C. is made from a physical mixture of a pure metal powder and a powdered ceramic. There will naturally be more variability in performance. The stiffness or Young's modulus of elasticity given for Tungsten Carbide has been measured in tension, but balls are almost always used in compression. In our experience, the Young's modulus of elasticity of cemented tungsten carbide is actually 10% higher in compression than it is in tension.
3. Processing the Ball Blank
The Tungsten carbide powder and powdered cobalt metal are mechanically mixed to form a uniform combination. To this combination is added a polymer or wax that acts as a mechanical binder in the pre-sintered stage. A carefully measured volume of this combined powder is compressed by a double acting press to form the tungsten carbide ball blank, or pre-form. The binder is removed by placing the preformed parts in a vacuum chamber and raising the temperature. The binder out gasses and is trapped down stream as a liquid. Next, the combined tungsten carbide and cobalt pre-forms are sintered or fused into a solid mass by heating them to a high temperature in a vacuum or hydrogen atmosphere furnace.Some tungsten carbide ball sizes are Hot Isocratic Pressed or hipped. The newest procedure is to Sinter-HIP the parts in a single operation. The metallurgically complete ball blanks are then rough ground with course diamond to remove all imperfections from the surface. Using micro size diamond dust, they are then finished lapped and polished to final size and microinch roundness with a sub-microinch surface finish.
4. Finished product testing and package
All TC balls are strictly controlled under American and European standard. Then we packaged in normal netural carton and deliver to customers all over the world.

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