The influence of cooling strength on aluminium alloy precision casting

Today we are going to introduce the influence of cooling strength on aluminium alloy precision casting. The old precision casting method mostly used split crystallisers, especially when casting flat ingots, where the water jacket and the crystalliser were separate. With the development of the casting process technology, the crystallizer of the modern precision casting method is integrated. With the old crystallizer casting cooling water consumption is large, because the old crystallizer water supply is not closed, part of the cooling water open fire and can not play a cooling role, and a cooling and secondary cooling of the cooling intensity difference people, inevitably produce some ingot quality defects; and with the modern crystallizer casting, cooling water consumption is small, practice has proved that it is only about 70% of the old crystallizer water consumption. At present, the international use of low level crystallizer casting, the purpose is to improve the cooling strength, reduce or eliminate the heating phenomenon of the air gap area after a cooling, so there is almost no secondary cooling quenching situation, flat ingot ordinary casting has been the height of the crystallizer down to 100 people, of course, this requires the operator to have a high level of operation or increase the level of white motion control system.

Cold flush but the strength of the cooling water temperature requirements are not negligible, usually, the cooling water temperature is set at 20 ℃, but due to regional climatic conditions. Water supply facilities conditions and plant temperatures vary greatly, resulting in regional or seasonal ingot quality defects. Modern crystalliser water supply systems with pulse or cross-phase functions are programmed by the process, so the cooling intensity can be set to a curve according to the needs of the casting process, especially for certain hard alloys with poor low temperature plasticity, cold cracking and hot cracking almost exist simultaneously when precision casting, additional water baffle system, so that the ingot surface temperature rises to the tensile deformation plastic temperature, eliminating cold cracking of the ingot, the process and then take The additional water baffle system allows the surface temperature of the ingot to be raised to the plastic temperature of tensile deformation, eliminating cold cracking of the ingot, and then taking measures to prevent hot cracking.