Abstract: A bumper molding is fabricated by disposing segmented anodes 31 and 32 on surfaces 22 and 24 of a base material 20, which are to be plated, and performing electroplating so as to form metal films on the surfaces 22 and 24, respectively. The curvature of a surface of a concave portion, which is formed in each part of the surfaces 22 and 24 so that the surface of the concave portion is away from the segmented anodes 31 and 32, respectively, is larger than those of other portions at a part serving as a border between the second plated surface 22 and the fourth plated surface 24. Accordingly, the distance from the part serving as the border between the second plated surface 22 and the fourth plated surface 24 to a metal case 50a corresponding to this part is set so as to be shorter than those from each of the other parts to the metal cases 50a and 50b respectively corresponding to the segmented anodes 31 and 32.

Abstract: A bumper molding is fabricated by disposing segmented anodes 31 and 32 on surfaces 22 and 24 of a base material 20, which are to be plated, and performing electroplating so as to form metal films on the surfaces 22 and 24, respectively. The curvature of a surface of a concave portion, which is formed in each part of the surfaces 22 and 24 so that the surface of the concave portion is away from the segmented anodes 31 and 32, respectively, is larger than those of other portions at a part serving as a border between the second plated surface 22 and the fourth plated surface 24. Accordingly, the distance from the part serving as the border between the second plated surface 22 and the fourth plated surface 24 to a metal case 50a corresponding to this part is set so as to be shorter than those from each of the other parts to the metal cases 50a and 50b respectively corresponding to the segmented anodes 31 and 32.

Abstract: In order to remove or decrease fine granular sulfides of Mn, Cr, Mo, etc. (Mn—S, Cr—S, Mo—S, etc.) left on a machined workpiece surface of sulfur free-cutting alloy steel without affecting the form and dimensional accuracy thereof, there is provided a method for treating the sulfur free-cutting alloy steel which comprises a soaking process of the machined workpiece in a solvent and an ultrasonic cleaning process by applying ultrasonic waves of 1.0 to 2.0 W/cm2 in watt density at a frequency of 40 KHz or a multi frequency in the solvent.

Abstract: In order to remove or decrease fine granular sulfide of Mn, Cr, Mo, etc. (Mn—S, Cr—S, Mo—S, etc.) left on a machined workpiece surface of sulfur free-cutting alloy steel without affecting form and dimensional accuracy thereof, there is provided a method for treating the sulfur free-cutting alloy steel which comprises a soaking process of the machined workpiece in a solvent and an ultrasonic cleaning process by applying ultrasonic wave of 1.0 to 2.0 W/cm2 in watt density at frequency of 40 kHz or multi frequency in the solvent.