Abstract:
There is provided a method for manufacturing a three-dimensional shaped object. The method of the present invention comprises the repeated steps of: (i) forming a solidified layer by irradiating a predetermined portion of a powder layer on a base plate with a light beam, thereby allowing a sintering of the powder in the predetermined portion or a melting and subsequent solidification thereof; and (ii) forming another solidified layer by newly forming a powder layer on the resulting solidified layer, followed by the irradiation of a predetermined portion of the powder layer with the light beam; wherein the solidified layers are formed such that they have a high-density portion whose solidified density is 95 to 100% and a low-density portion whose solidified density is 0 to 95% (excluding 95%); and wherein the high-density portion is a portion of the three-dimensional shaped object, to which the force is applied when the three-dimensional shaped object is used.
Abstract:
A portable television-broadcast reception unit is provided which is capable of changing the direction of a directional antenna easily to a direction where an enough quality to watch television can be obtained. In this unit: a television-broadcast reception section 20 receives a broadcast wave using a directional antenna 10; a direction measurement section 60 measures the direction of the directional antenna 10; an electric-field strength measurement section 70 measures the electric-field strength value of the received broadcast wave; a storage section 30 stores an electric-field strength management table which includes the direction measured by the direction measurement section 60 and the electric-field strength value measured by the electric-field strength measurement section 70; a control section 40 controls the measurement of the direction and the measurement of the electric-field strength, updates the electric-field strength management table and selects the direction where the maximum electric-field strength value can be obtained; an image-turn processing section 80 turns the received image so that the upper part of the image is oriented to the direction where the maximum electric-field strength value can be obtained; and a display section 50 displays the turned image.
Abstract:
The present invention pertains to a process for hydroprocessing a heavy hydrocarbon oil, comprising contacting a heavy hydrocarbon oil in the presence of hydrogen with a mixture of hydroprocessing catalyst I and hydroprocessing catalyst II. The process of the invention combines high contaminant removal with high conversion, low sediment formation, and high process flexibility.
Abstract:
Prior to molding, an initial position of at least one movable reference mark, provided in the vicinity of an object of manufacture, is measured by a first position measuring means, and the initial position of the movable reference mark is measured by a second position measuring means provided in a processing means. During the course of molding, measurement of a position of the movable reference mark is carried out by the first position measuring means and the second position measuring means. Then, based on the initial position of the movable reference mark prior to molding and the position of the movable reference mark measured by the first and second position measuring means during the course of molding, an optical beam irradiating position of an optical beam and a processing position of the processing means are corrected.
Abstract:
A method for producing a three-dimensionally shaped object, includes the steps of: (i) forming a solidified layer by irradiating a light beam on a specified portion of a powder layer placed on a shaping table to sinter or melt the specified portion; (ii) forming another solidified layer by placing a new powder layer on the solidified layer thus obtained, and irradiating the light beam on a specified portion of the new powder layer to sinter or melt the specified portion of the new powder layer; and (iii) repeating the step (ii) to produce a three-dimensionally shaped object. When performing the steps (i) to (iii) within a chamber, at least a part of an ambient gas in the chamber is exhausted from the chamber through a gas passage of a shaping tank.
Abstract:
The invention relates to a method of making a three-dimensional object, comprising the steps of: (a) forming a powder material layer (10) of inorganic material; (b) irradiating an optical beam (L) on a predetermined portion of the powder material layer (10) to form a first sintered layer (11) and integrate the first sintered layer (11) with a second sintered layer (11) just below the first sintered layer (11); (c) repeating the steps (a) and (b) to form a sintered block (B) united with a plurality of the first and second sintered layers (11), the sides of the sintered block (B) including a concave portion (g); (d) removing an excess portion (17) from a surface of the sintered block (B); and (e) repeating the steps (c) and (d) with respect to the sintered block (B) from which the excess portion (17) is removed, in order to make a target shape of a three-dimensional object united with a plurality of the sintered blocks (B).
Abstract:
Prior to molding, an initial position of at least one movable reference mark, provided in the vicinity of an object of manufacture, is measured by a first position measuring means, and the initial position of the movable reference mark is measured by a second position measuring means provided in a processing means. During the course of molding, measurement of a position of the movable reference mark is carried out by the first position measuring means and the second position measuring means. Then, based on the initial position of the movable reference mark prior to molding and the position of the movable reference mark measured by the first and second position measuring means during the course of molding, an optical beam irradiating position of an optical beam and a processing position of the processing means are corrected.
Abstract:
To make a three-dimensional object, an optical beam is first irradiated on a predetermined portion of a powder layer to form a sintered layer, which is then covered with a new powder layer. The optical beam is again irradiated on a predetermined portion of the new powder layer to form another sintered layer that has been united with the underlying sintered layer. These processes are repeatedly carried out to form a plurality of sintered layers united together. When the second lower density layer is formed on the first higher density layer, a powder material layer for the lower density layer is formed at a predetermined thickness so as to have a thickness suitable for sintering condition and then the powder material layer is sintered to form the lower density layer.
Abstract:
In order for a surface of a three-dimensional sintered object to be smoothly finished by removing unwanted portions and an excessively sintered growth formed during sintering to form sintered layers, the three-dimensional sintered object is formed by repeating successive processes of dispensing a powdery material and directing an optical sintering beam to the powdery material to form the sintered layer, until a required number of integral laminated bodies are formed. During the formation of the integral laminated bodies, trimming is applied to a first zone different from a second zone in which each laminated body is formed, to remove unwanted portions of the respective laminated body.
Abstract:
A three-dimensional object is made by repeating a process. An optical beam is irradiated on a predetermined portion of a powdery layer to form a sintered layer. A new powdery layer is formed on a surface of the sintered layer. An optical beam is irradiated on a predetermined portion of the new powdery layer to form a new sintered layer united with the underlying sintered layer. Because a portion of the sintered layer that is higher than a predetermined level is removed as occasion demands, the abnormally sintered portion on the sintered layer can be removed, making it possible to prevent stoppage of the shaping process, which may be caused by the abnormally sintered portion.