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09
2021
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03
Foundry: How to solve defects in pump body castings?
Foundry
Foundry: The fundamental focus of solving shrinkage porosity defects in pump body castings is "thermal equilibrium." Solutions: 1. Tilting the mold and alloying both provide benefits. Eliminating shrinkage porosity defects in pump body castings is a complex process of understanding and implementation.
Foundry: Solve Pump body casting The fundamental focus of the method to solve shrinkage porosity defects is "thermal equilibrium."
Solution:
1. Tilting the mold and alloying are both beneficial. Eliminating shrinkage porosity defects in pump body castings is a complex process of understanding and implementation. A scientific analysis should be conducted on the Juyi pump body castings based on the basic principle of "thermal equilibrium", a reasonable process plan should be formulated, suitable molding materials and tooling should be selected, and correct operation should be standardized. Then any shrinkage porosity defects in pump body castings can be solved.
2. Implement rapid solidification at the thick and hot spots formed by the pump body casting structure to artificially create a basic balance in the temperature field of the pump body casting. Use internal and external chills, and locally use zircon sand, chromite sand, or special coatings with high heat storage capacity.
3. The machine tool casting mold of ductile iron has high strength, surface hardness ≧90, and the sand box has high rigidity, which is beneficial to eliminating shrinkage porosity.
4. Foundry: Reasonable process design. The inner runner is set at the relatively thin wall of the pump body casting, with multiple and dispersed numbers. Make the metal liquid entering the thick wall first solidify first, and the thin wall solidify later, so that each place basically reaches a balanced solidification. For pump body castings with uniform wall thickness, multiple inner runners and vent holes are used. Multiple, dispersed, and evenly distributed inner runners make the overall heat balance. The vent holes are thin and numerous, which not only exhausts air smoothly but also dissipates heat.
5. When a riser is needed, move the hot riser and leave the hot spot. If the riser is placed on the hot spot, the riser size will inevitably be increased, forming "heating on heat". If it is not done well, not only will shrinkage porosity be difficult to eliminate, but also concentrated shrinkage cavities will be generated, which will reduce the process yield.
6. Change the position of the inner runner.
7. The selection of molding materials with high heat storage capacity is extremely important for the production of wear-resistant products using the lost foam process! Replacing quartz sand and other sands with low heat storage capacity with chromite sand will achieve good results.
8、 Foundry : Low-temperature rapid burning, open pouring system. Make the metal liquid fill the mold quickly, smoothly, and evenly, which should be adapted to local conditions.
Pump body, casting, foundry
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