How do we deal with the edge cracks of cast aluminium bars?
Causes:1., the casting structure design is unreasonable, there are sharp corners, wall thickness change is too wide2., sand (core) concessions bad3. local overheating of mold4. pouring temperature is too high5. casting out the casting prematurely6. heat treatment, overheating or over burning, excessive cooling rateSolving measures:1., improve the structural design of casting, avoid sharp corners, wall thickness to uniform, smooth transition2., take measures to increase the sand (core) yield3. ensure the solidification or solidification of each part of the casting, and improve the design of the gating system4. appropriately reduce pouring temperature5. control casting cooling out time6. heat treatment method is adopted for casting deformation7. correctly control the heat treatment temperature and reduce the quenching cooling speed
The maximum content of alloying element silicon in cast aluminum alloy is higher than that in most wrought aluminum alloy. In addition to strengthening elements, it must also contain sufficient amounts of eutectic elements (usually silicon) to make the alloy considerably mobile and easy to contract with the casting of the filling casting.Casting crack is a crack formed at higher temperature. It is easy to appear in larger volume shrinkage alloy and more complex shape casting.
Cast aluminium alloys can be directly obtained from aluminum alloy and aluminium alloy castings by metal casting forming process. The content of alloy elements in this kind of alloy is generally more than that of the deformed aluminum alloy.For casting order, information casting technical issues, please visit the casting order network
