| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely fill up molding sand into a flask body while fluidizing the molding sand in a blow head by making the pressure in the blow head lower than the pressure in a sand magazine in the specific range, at the time of blowing the molding sand in the upper and the lower blow heads into the upper and the lower flask bodies. SOLUTION: At the time of blowing and filling up the molding sand in the upper and the lower blow heads 4, 5 into the upper and the lower flask bodies 2, 3, the pressure in the upper and the lower blow heads 4, 5 is made to lower by the range of <=0.1MPa differential pressure than the pressure in the sand magazine 6. The pressure in the sand magazine 6 is made to the max. of about 0.18MPa accompanied with the pressure loss, and the pressure in the upper and the lower blow heads 4, 5 is made to about 0.15MPa by adjusting with an upper and a lower, first and second compressed air injecting mechanisms 12-15. Even if the molding sand in the upper and the lower blow heads 4, 5 is pressed with the compressed air supplied into the sand magazine 6, the molding sand is blown into the upper and the lower flask bodies 2, 3 under fluidized condition with the compressed air injected from a vent plug.</p> |
