| 摘要 |
PURPOSE:To form a casting mold which provides high hardness to a casting surface, particularly hardness in the pocket part of the casting mold by squeezing the sand from the pattern side when the squeezing from the side opposite from the pattern arrives at the neighborhood of the stroke end of the entire squeezing stroke. CONSTITUTION:A pattern molding board 12, a molding flask 13, and an upper additional flask 14 are placed on a squeezing cylinder 11, and molding sand is charged to the inside thereof. The cylinder 11 is moved upward to perform upper squeezing by means of a segment squeeze head 15 in the upper part. The flask 13 and the flask 14 are moved upward relatively with the molding sand by means of molding flask lifters 16. The cylinder 11 is again moved upward to perform lower squeezing from the board 12 side and the forming of a casting mold 3 is completed. The casting mold which provides high hardness on the casting surface, particularly hardness in the pocket part thereof owing to the slight squeezing stroke on the lower side is formed by the above-mentioned method. |
