Abstract: A planetary carrier includes a plurality of plate portions, and column portions connecting the plurality of plate portions. The column portions each have an outer circumferential surface, an inner circumferential surface, and sidewall surfaces. The sidewall surfaces are each formed in a circular arc shape and the circular arc shape has a center on an outer circumferential side in a cross section perpendicular to a shaft of the planetary carrier. An angle formed between the outer circumferential and each of the sidewall surfaces is an obtuse angle and an angle formed between the inner circumferential and each of the sidewall surfaces is an acute angle. The plurality of plate portions and the column portions are integrally formed as one sintered body.

Abstract: A machining method for forming an opening through a workpiece, serving as a green compact, by moving a milling tool in a radial direction relative to the workpiece is provided. The milling tool includes a first milling tool and a second milling tool. The method includes a pre-machining step of using the first milling tool, and forming the first sidewall surface by rotating the first milling tool so as to cause cutting edges of the first milling tool to cut the workpiece from the acute angle corner to the obtuse angle corner, while leaving a cutting allowance on the second sidewall surface; and a post-machining step of using the second milling tool whose cutting edges are reversed from the cutting edges of the first milling tool, and forming the second sidewall surface by rotating the second milling tool so as to cause the cutting edges of the second milling tool to cut the cutting allowance from the acute angle corner to the obtuse angle corner.

Abstract: A machining method for forming an opening through a workpiece, serving as a green compact, by moving a milling tool in a radial direction relative to the workpiece is provided. Among inner wall surfaces defining the opening, respective cut surfaces, cut by cutting edges on an outer periphery of the milling tool, are defined as a first sidewall surface and a second sidewall surface that is opposite the first sidewall surface. A side from which the milling tool enters is defined as an outer circumferential surface of the workpiece, and a surface opposite to the outer circumferential surface is defined as an inner circumferential surface of the workpiece. A corner where the first sidewall surface or the second sidewall surface and the outer circumferential surface meet is defined as an obtuse angle corner, and a corner where the first sidewall surface or the second sidewall surface and the inner circumferential surface meet is defined as an acute angle corner.

Abstract: A method for producing rare earth sintered magnets includes the steps of pressing and compacting an alloy powder for the rare earth sintered magnets, thereby preparing a plurality of green compacts, arranging the green compacts on a receiving plane in a direction in which a projection area of each of the green compacts onto the receiving plane is not maximized, and heating the green compacts, thereby sintering the green compacts and obtaining a plurality of sintered bodies.

Abstract: A method for producing rare earth sintered magnets includes the steps of pressing and compacting an alloy powder for the rare earth sintered magnets, thereby preparing a plurality of green compacts, arranging the green compacts on a receiving plane in a direction in which a projection area of each of the green compacts onto the receiving plane is not maximized, and heating the green compacts, thereby sintering the green compacts and obtaining a plurality of sintered bodies.