| 摘要 |
PURPOSE:To form a casting mold having good hardness and dimensional accuracy under low squeezing pressure by oscillating a matching plate in the direction intersecting orthogonally with a squeezing direction in the stage of squeezing in a flaskless molding method. CONSTITUTION:Molding sand is packed in a matching plate 1, a squeezing head 3 and a flask 3, and the plate 1 is oscillated transversely at about 30-100Hz frequency and about 0.2-1mm. amplitude by means of a vibrator 4. About 3- 10kg/cm<2> squeezing pressure is applied at the same instant on the sand by the head 2 in the direction perpendicular to the above-mentioned oscillating direction to reproduce exactly the ruggedness of the matching plate, thereby eliminating the uneven sand hardness in the casting mold. The casting mold which has satisfctory hardness and dimensional accuracy without shape collapsion is thus formed under the low squeezing pressure. |
