A method for manufacturing iron-based metallurgical parts, the method comprising: mixing graphite powder; pressing; presintering; oxidizing the presintered metallurgical part to form an oxide layer having a thickness of 1 m to 50 m on its surface to form an oxidized presintered metallurgical part; sintering; machining; carburizing; quenching and tempering. An oxide layer is formed on the surface of a part by oxidization, oxygen in the oxide layer is chemically reacted with the carbon in the surface layer of the product during the sintering, and the resulting product enters a sintering atmosphere in the form of gas to form a decarburized layer having a certain thickness on the surface of the part, so that the decarburization is realized.

Provided is a method for producing a rare-earth magnet that can resolve a problem of deterioration of the residual magnetization and coercive force of the rare-earth magnet due to spring-back in producing the rare-earth magnet through performing hot deformation processing of upsetting on a sintered body. The method includes a first step of producing the sintered body through press-forming of magnetic powder for a rare-earth magnet, and a second step of producing a rare-earth magnet precursor through hot deformation processing of upsetting in which the sintered body is placed within a plastic processing mold and is pressurized in a predetermined direction so as to impart magnetic anisotropy to the sintered body, and performing cooling of the rare-earth magnet precursor while a predetermined pressure is kept being applied thereto in the predetermined direction, so that the rare-earth magnet is produced.

Provided is a method for producing a rare-earth magnet that can resolve a problem of deterioration of the residual magnetization and coercive force of the rare-earth magnet due to spring-back in producing the rare-earth magnet through performing hot deformation processing of upsetting on a sintered body. The method includes a first step of producing the sintered body through press-forming of magnetic powder for a rare-earth magnet, and a second step of producing a rare-earth magnet precursor through hot deformation processing of upsetting in which the sintered body is placed within a plastic processing mold and is pressurized in a predetermined direction so as to impart magnetic anisotropy to the sintered body, and performing cooling of the rare-earth magnet precursor while a predetermined pressure is kept being applied thereto in the predetermined direction, so that the rare-earth magnet is produced.

It has been found that metal parts having rough surfaces can be manufactured by (1) compacting a metal powder under high pressure in a mold to make a green part, wherein at least one face of the mold is roughened by electrical discharge machining to have an R.sub.a of 10 to 200 micro-inches, as measured with a profilometer having a stylus tip, (2) heating the green metal part to a temperature of at least 1500 F. to sinter the green metal part to produce the metal part having at least one rough surface, wherein the rough surface has an R.sub.a which is within the range of 10 to 200 micro-inches, as measured with a profilometer having a chisel tip, and (3) optionally, buffing, classifying, deburring and/or washing the metal part. This method can be beneficially used in manufacturing clutch plates, pressure plates, and cam shaft sprockets.

In order to supply sufficient amount of oil to one or more sliding surfaces and to prevent the supplied oil from moving from the sliding surface(s) to an inside so as to achieve lower friction and improve sliding performance of a bearing, in an oil-impregnated sintered bearing 1, sliding surfaces 3 supporting an outer circumferential surface of a shaft 11 and an oil supply surface 4 in which a diameter is larger than that of the sliding surfaces 3 are formed on an inner circumferential surface of a bearing hole 2 into which the shaft 11 is inserted, to be adjacent in an axial direction of the bearing hole 2, a height gap d1 between the sliding surfaces 3 and the oil supply surface 4 is not less than 0.01% and not more than 15% of an inner diameter of the sliding surfaces, a surface opening percentage of the sliding surfaces 3 is not higher than 10%, a surface opening percentage of the oil supply surface 4 is higher than 10%, and an average circle-equivalent diameter of opening parts of pores on the sliding surfaces is not larger than 20 m.

It has been found that metal parts having rough surfaces can be manufactured by (1) compacting a metal powder under high pressure in a mold to make a green part, wherein at least one face of the mold is roughened by electrical discharge machining to have an R.sub.a of 10 to 200 micro-inches, as measured with a profilometer having a stylus tip, (2) heating the green metal part to a temperature of at least 1500 F. to sinter the green metal part to produce the metal part having at least one rough surface, wherein the rough surface has an R.sub.a which is within the range of 10 to 200 micro-inches, as measured with a profilometer having a chisel tip, and (3) optionally, buffing, classifying, deburring and/or washing the metal part. This method can be beneficially used in manufacturing clutch plates, pressure plates, and cam shaft sprockets.

The present disclosure generally pertains to lightweight adaptive metal cooled mirrors and methods of producing the same. The metal mirror surface is integrated with and supported by metal channels which are physically incorporated into the mirror surface through an additive manufacturing process. These channels are nominally conformal with the desired mirror surface shape. A liquid or gaseous coolant may be directed through some or all of the channels to cool the mirror surface. The mirrors are produced through an additive manufacturing process which allows for the creation of a unitary optical mirror containing finely spaced channels.

The present disclosure generally pertains to lightweight adaptive metal cooled mirrors and methods of producing the same. The metal mirror surface is integrated with and supported by metal channels which are physically incorporated into the mirror surface through an additive manufacturing process. These channels are nominally conformal with the desired mirror surface shape. A liquid or gaseous coolant may be directed through some or all of the channels to cool the mirror surface. The mirrors are produced through an additive manufacturing process which allows for the creation of a unitary optical mirror containing finely spaced channels.

A device for producing a gear green compact from a powder includes a die, an upper stamp, and a lower stamp, wherein the die has at least one helical toothing on an inner lateral surface, which helical toothing extends only over a partial area of the circumference of the inner lateral surface, and which has a first helix angle, wherein, adjoining the first helical toothing in a circumferential direction, one toothed edge surface is formed on each side, both of which have a second helix angle, wherein at least one of the second helix angles of the die is unequal to the first helix angle of the helical toothing of the die.

A method, apparatus, and program for build surface mapping and recovery for additive manufacturing. The method may include fabricating an object by additive manufacturing wherein the topology of a build surface is determined. An additive manufacturing process may be modified based on the topology determination. The topology of the surface may be determined by marking the surface with a first mark using a converging energy source; determining a dimension of the mark using a camera; and determining a height of the first mark based on the dimension of the mark.