| 摘要 |
PROBLEM TO BE SOLVED: To improve adhesiveness to an aluminum alloy up to a desired value, and to uniformize recessed parts for good circulation of molten metal. SOLUTION: This molten metal enclosed liner 21 has the recessed parts of a fine irregularity portions 31 on an outer-periphery surface 26. A pitch of the recessed parts is in a range of 100-300μm, and a depth of the recessed parts is in a range of 70-150μm. In a shot-blasting process for forming the irregularity, shot particles with a mean particle size of 450-650μm is used, and aluminum particles are used for the shot particles. Namely, the number of recessed parts which the molten metal does not enter starts to increase if the pitch becomes less than 100μm, and adhesion strength hardly increases. The number of recessed parts to the outer-periphery surface is small if it exceeds 300μm, therefore, the adhesiveness to the aluminum alloy can be increased up to the desired value by solidification in the recessed parts, if the depth of the recessed parts is at and more than 70μm. When the depth exceeds 150μm, machining is necessary to increase production cost. The recessed parts can be uniformized by setting the mean particle size in the range of 450-650μm. COPYRIGHT: (C)2004,JPO
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