A production process for large-sized carbide valve balls above φ80
A cemented carbide and production process technology, applied in the field of cemented carbide valve ball production process, can solve the problems of increased scrap rate, low molding efficiency, uneven density of finished balls, etc., and achieve the effect of eliminating residual stress
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Embodiment 1
[0031] This experiment needs to process a cemented carbide valve ball with a diameter of 100mm, using a series of titanium-based formulas, including: TiC: 81.5%, binder: 5.5%; grain inhibitor: 7.5%; reinforcement: 1%; Toughening agent: 1%, the rest is unavoidable impurities, put it into the stirrer and stir at a constant speed, the stirring speed is 1000r / min, the stirring time is 5 minutes, and the temperature is controlled between 20°C and 25°C;
[0032] After the stirring is completed, the stirred raw materials are sent into a static press, and placed on a built-in steel frame for pressing. The set pressure for pressing is 155 MPa, and the static pressing time is 4.5 minutes.
[0033] The pressed valve ball is sintered by vacuum sintering process. Vacuum sintering can better remove Si, Mg, Ca and other oxide impurities in the sintered body, thereby improving the purity of cemented carbide. At the same time, the gas phase under vacuum The carburizing and decarburizing effect...
Embodiment 2
[0042] This experiment needs to process a cemented carbide valve ball with a diameter of 80mm, using a nickel-based series formula, including: WC: 83%, hydroxynickel powder: 8%; grain inhibitor: 7%; reinforcing agent: 1%, remaining The unavoidable impurities are placed in a stirrer for constant stirring, the stirring speed is 1000r / min, the stirring time is 5 minutes, and the temperature is controlled between 22°C and 25°C;
[0043] After the stirring is completed, the stirred raw materials are sent into a static press, and placed on a built-in steel frame for pressing. The set pressure for pressing is 155MPa, and the static pressing time is 4 minutes.
[0044]The pressed valve ball is sintered by vacuum sintering process. Vacuum sintering can better remove oxide impurities such as Si and Ca in the sintered body, thereby improving the purity of the cemented carbide, and at the same time, the infiltration of the gas phase under vacuum The carbon and decarburization effects are ...
Embodiment 3
[0049] This experiment needs to process a cemented carbide valve ball with a diameter of 90mm, using a cobalt-based series formula, including: WC: 59%, Ni: 12%, Co: 30%, and the rest are unavoidable impurities, put into the stirring Stir at a constant speed in the container, the stirring speed is 800r / min, the stirring time is 5 minutes, and the temperature is controlled between 22°C and 25°C;
[0050] After the stirring is completed, the stirred raw materials are sent into a static press, and placed on a built-in steel frame for pressing. The set pressure for pressing is 145 MPa, and the static pressing time is 3 minutes.
[0051] The pressed valve ball is sintered by vacuum sintering process. Vacuum sintering can better remove oxide impurities such as Si and Ca in the sintered body, thereby improving the purity of the cemented carbide, and at the same time, the infiltration of the gas phase under vacuum The carbon and decarburization effects are greatly reduced, and it is ea...
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Abstract
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