In recent years, environmental protection against to global warming and deterioration of environment has been paid attention to. Authors have been developing molding machine not only increasing productivity but also achieving environmentally-friendly production, safety and improving working environment. In that development, the key technology is "Aeration sand filling". In the conventional sand filling, the falling sand particles have directional property. It always caused problems such as uneven sand density even on the same pattern and insufficient sand filling into small bore pockets. These problems are solved by aeration sand filling technology. The compressed air with low pressure is introduced into the sand tank to fluidize the molding sand, and guide the sand into the molding flask. As the compressed air with low pressure is used, the air consumption is reduced, and the noise caused by compressed air is decreased. Aeration sand filling carries many other advantages. One of them is low noise and low vibration. Dimensional deviation of casting has been improved, thus finishing cost could have been reduced. Sand filling performance in the complex shape has been improved by the aeration sand filling. Therefore, defects of mold has been greatly reduced. This technology was applied to tight-flask molding machine at first. Next, authors developed the small-size flaskiless horizontal molding machine with latest technology for the advanced of the small jobbing foundry.
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