To prevent the deformation of iron castings, the first point is concerned, in fact, we should pay attention to when making cored, it is necessary to pay attention to be sure to leave some amount of sand. And for the sand in terms of speaking, to prevent the deformation of iron castings, that is, should pay attention to should have a certain concession. Add a suitable amount of sawdust in the core sand, then, that is, it should be used to screen fine mesh.
Next, in fact, we should also pay attention to prevent deformation of iron castings, that is, we must pay attention to must be added to the appropriate amount of crushed coke crushed, followed, that is, it should be used 8 ~ 10 mesh sieve . The two added to the core sand mixed grind, improve the permeability of the core sand as well as its concession and related temperature performance.
To prevent the deformation of iron castings, castings in the castings after it is not too early, especially the machine bed gear box and large castings, at the same time, that is, should pay attention to should not be allowed to pour (dial) water Chilling, followed, that is, to be aware of the need to avoid the phenomenon of increased cooling of the casting, making the free cooling of the normal casting shrinkage, so that will get a relatively high quality castings.
However, there are individual types of iron castings will also be relatively simple structure, the more common heavy iron, etc., in which case, pre-tank water chilling is allowed. Furthermore, to avoid deformation of iron castings, we actually pay attention to the production of wooden mold, the timber itself is to pay attention to keep dry, the structure should be reasonable, after the wood mold, the core and its active parts that is Be careful to mark it.
At the same time, to avoid the phenomenon of deformation of iron castings, to a large extent, it is necessary to pay attention to their own inspection, and then also should be noted that the inspection should be combined with the person to avoid shrinking the size of wood and processing Margin error. After the shape is completed, the wooden mold should be flat and flat, that is, pay attention to avoid distortion warping wood mold, so that is to avoid deformation of iron castings.http://www.dmgcastings.com/