Precautions in the Operations of Tungsten Carbide AnvilsⅠ

1.Elimination of internal residuall stress
Before the use of tungsten carbide anvils, the anvils should undergo an ageing process to eliminate internal residual stress. They can be aged naturally for more than one month and of course the longer the better. They can be alternatively baked and oil bathed at a temperature of 180-220oC. Good results can not be achieved if the temperature is too low, and oxidation will occur on the surface of anvils if the temperature is too high. The ageing time is normally around one week.

2.Instruction for assembling tungsten carbide anvils
The steel ring and the carbide anvil should be installed with a rational shrinkage range and their conicity should be identical with a contact area of over 90% in order that the anvils stay in a state of elasticity while under a high pressure. Other parts that are in contact with the anvils during installation shall be in contact with the facets of the anvils instead of point or line contacts to avoid the local concentration of stress.

3.Requirements for the equipment using tungsten carbide anvils
The system`s pressure shall not exceed 85 MPa. The presses for synthesization must have good manufacturing and adjusting precision and the stability of presses should be insured without any leakage in the system. The synchronism and centricity must be guaranteed with a deviation of not more than 0.2mm.


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