Patent ID: 7566504
Filing Date: 2009-07-28
Classification: B22D,F02F,F16C,Y10T

Abstract:
1. An iron species preform for forming a metal matrix composite by casting-in the iron species preform with an aluminum species alloy base material, the iron species preform comprising: an inner peripheral face having a section in a semicircular shape and continuously extending along a direction of a center axis; and a plurality of inner side grooves formed on the inner peripheral face at spaces in a peripheral direction, each inner side groove continuously extending along the direction of the center axis and having a section of U-shape opened to the center axis, wherein each inner side groove includes: when a length from the base end to the depth end of the flat portion is A, a groove width of the inner side groove is B, a radius of curvature of a sectional shape of the groove bottom portion orthogonal to the center axis is C, an angle of inclination of the flat portion relative to a reference line in a linear shape extended from the center axis to a center of the groove width is E, and a space between the centers of the respective groove widths of the inner side grooves contiguous to each other is F, then