Abstract: A re-circulatory blasting device obtained is capable of performing stable treatment for a prolonged period of time even in cases in which an elastic abrasive employed has abrasive grains adhered to the surface of elastic cores. An elastic abrasive regeneration device provided to the blasting device regenerates elastic abrasive employed for re-circulation. The elastic abrasive regeneration device includes a mixer and a combining unit. Recovered abrasive fed in from an abrasive recovery section is mixed in the mixer with abrasive grains fed in from an abrasive grain feeder, and the abrasive grains are adhered to the surface of the cores of the recovered abrasive. In the combining unit, the abrasive grains are pressed against and combined to the surface of the cores by passing an aggregated state of the recovered abrasive mixed by the mixer along a constricted flow path having a flow path cross-sectional area that gradually narrows.

Abstract: A re-circulatory blasting device obtained is capable of performing stable treatment for a prolonged period of time even in cases in which an elastic abrasive employed has abrasive grains adhered to the surface of elastic cores. An elastic abrasive regeneration device provided to the blasting device regenerates elastic abrasive employed for re-circulation. The elastic abrasive regeneration device includes a mixer and a combining unit. Recovered abrasive fed in from an abrasive recovery section is mixed in the mixer with abrasive grains fed in from an abrasive grain feeder, and the abrasive grains are adhered to the surface of the cores of the recovered abrasive. In the combining unit, the abrasive grains are pressed against and combined to the surface of the cores by passing an aggregated state of the recovered abrasive mixed by the mixer along a constricted flow path having a flow path cross-sectional area that gradually narrows.

Abstract: A surface treatment method for preventing adhesion of powder to a powder-contacting member having a surface on which contacted powder flows in the form of a particle layer. The method includes performing surface treatment on the surface such that an arithmetic average peak curvature Spc (1/mm) of the surface is 150 to 400, a peak density Spd (piece/mm2) of the surface is 10000 to 180000, a root mean square gradient Sdq of the surface is 0.05 to 0.30, and an arithmetic average height Sa (?m) of the surface is 0.02 to 3.00, and providing a space where an air layer can exist between the particle layer and the surface.

Abstract: A method for surface treatment of a DLC coated member that includes: taking as a treatment subject a DLC coated member having a DLC film coated on a base material surface; ejecting substantially spherical ejection particles having a median diameter of from 1 ?m to 20 ?m and a falling time through air of not less than 10 s/m against a surface of the film of the member at an ejection pressure of from 0.01 MPa to 0.7 MPa; and forming dimples on the surface of the film without exposing the base material so that a total projected area of the dimples is 50% or more of a treated region and so that the surface of the DLC film is processed to an arithmetic mean height (Sa) of from 0.01 ?m to 0.1 ?m and a texture aspect ratio (Str) of 0.4 or more.

Abstract: A fluidized bed or fluidized bed/spouted bed granulator into which urea seed particles, an aqueous urea solution and air are introduced to produce urea particles with an average particle size of 1 mm or more. The granulator includes a box-shaped granulation chamber with a bottom floor, a top and side surfaces. Inner wall surfaces of the chamber are of a metal plate material, an upper part of the side or top surfaces includes an exhaust outlet, the side surfaces or top surface includes an inlet for introducing the seed particles, the side surfaces include a collection port for the particles, the aqueous urea solution is introduced from the bottom floor or the side surfaces, the air is introduced from the bottom floor or the bottom floor and the side surfaces, and at least a portion of the inner wall surfaces of the granulation chamber is treated by surface roughening.

Abstract: A method for surface treatment of a workpiece made from a hard-brittle material comprises first blasting employing abrasive grains of higher hardness than a hardness of a base material of the workpiece for forming a three dimensional recess-protrusion profile having protrusions and recesses formed between the protrusions on a surface of the workpiece; and second blasting employing an elastic abrasive having a structure in which abrasive grains carried in and/or on an elastic body made from material with low rebound elasticity for polishing the surface of the workpiece formed with the recess-protrusion profile so as to achieve an arithmetic average roughness Ra of not greater than 1.6 ?m on the surface of the protrusions and the recesses on the workpiece while maintaining the recess-protrusion profile formed by the first blasting.

Abstract: A re-circulatory blasting device obtained is capable of performing stable treatment for a prolonged period of time even in cases in which an elastic abrasive employed has abrasive grains adhered to the surface of elastic cores. An elastic abrasive regeneration device provided to the blasting device regenerates elastic abrasive employed for re-circulation. The elastic abrasive regeneration device includes a mixer and a combining unit. Recovered abrasive fed in from an abrasive recovery section is mixed in the mixer with abrasive grains fed in from an abrasive grain feeder, and the abrasive grains are adhered to the surface of the cores of the recovered abrasive. In the combining unit, the abrasive grains are pressed against and combined to the surface of the cores by passing an aggregated state of the recovered abrasive mixed by the mixer along a constricted flow path having a flow path cross-sectional area that gradually narrows.

Abstract: The present invention is directed to provide a method of forming dimples comparatively simply on a surface of hard-brittle materials such as ceramics by post-processing. In the method, substantially spherical ejection particles having a median diameter d50 of from 1 ?m to 20 ?m are ejected together with a compressed gas at an ejection pressure of from 0.01 MPa to 0.7 MPa against a dimple formation region which is a region where dimples are to be formed on a surface of an article made from a hard-brittle material or a surface of an article having a surface coated with a coating layer of a hard-brittle material, or the like so as to form dimples on the surface of the hard-brittle material by plastic deformation without occurrences of breaks or cracks.

Abstract: A surface treatment method is provided that is capable of raising the slidability of a ceramic surface at low cost using a comparatively simple method. Dimples are formed on a surface of a treatment region, this being a portion of a ceramic surface where surface treatment is to be performed, by ejecting substantially spherical ejection particles having a median diameter of from 1 ?m to 20 ?m, together with compressed gas at an ejection pressure of from 0.01 MPa to 0.7 MPa, so as to achieve a value of a fastest decay autocorrelation length of not less than 10. The dimples are formed so as to have a plan view profile with a ratio between a horizontal Feret diameter and a vertical Feret diameter of from 0.7 to 1.43. Thereby a ceramic surface with improved slidability can be obtained regardless of use or non-use of a lubricant.

Abstract: A powder-contacting member that prevents adhesion of powder even when the powder coming into contact with a surface is not only in the form of a single particle but also in the form of a layer, and has high flowability, and a method for the surface treatment of a powder-contacting member. The powder-contacting member has a surface with which powder comes into contact and on which surface treatment is performed. An arithmetic average peak curvature Spc (1/mm) of the surface is 150 to 400, a peak density Spd (piece/mm2) of the surface is 10000 to 180000, a root mean square gradient Sdq of the surface is 0.05 to 0.30, and an arithmetic average height Sa (?m) of the surface is 0.02 to 3.00.

Abstract: A method for surface treatment of a DLC coated member that includes: taking as a treatment subject a DLC coated member having a DLC film coated on a base material surface; ejecting substantially spherical ejection particles having a median diameter of from 1 ?m to 20 ?m and a falling time through air of not less than 10 s/m against a surface of the film of the member at an ejection pressure of from 0.01 MPa to 0.7 MPa; and forming dimples on the surface of the film without exposing the base material so that a total projected area of the dimples is 50% or more of a treated region and so that the surface of the DLC film is processed to an arithmetic mean height (Sa) of from 0.01 ?m to 0.1 ?m and a texture aspect ratio (Str) of 0.4 or more.

Abstract: An artificial tooth 30 to be polished is fixed at a tooth neck 32 side and rotated about a tooth axis 33. Abrasives, preferably elastic abrasives formed by kneading abrasive grains into or supporting abrasive grains on an elastic material, are ejected together with a compressed gas at an ejection pressure of from 0.1 MPa to 0.5 MPa onto an occlusal portion 31 side of the artificial tooth 30 while the artificial tooth 30 is being rotated. The abrasives are ejected at an inclination angle ? with respect to the tooth axis 33 of the artificial tooth 30 of from 0° to 90°, and preferably from 15° to 75°. Portions on the occlusal portion 31 and side surfaces 38 of the artificial tooth 30 are thereby polished at the same time by the abrasive sliding over these portions.

Abstract: A method of treating a surface of a mold. The method includes forming dimples on a surface of a mold by ejecting substantially spherical ejection-particles so as to bombard the surface of the mold. The dimples are formed so as to satisfy a condition defined by the following formula: 1+3.3e?H/230?W?3+13.4e?H/1060 wherein W is an equivalent diameter (?m) of the dimples and H is a base metal hardness (Hv) of the mold.

Abstract: A method for surface treatment of a workpiece made from a hard-brittle material comprises first blasting employing abrasive grains of higher hardness than a hardness of a base material of the workpiece for forming a three dimensional recess-protrusion profile having protrusions and recesses formed between the protrusions on a surface of the workpiece; and second blasting employing an elastic abrasive having a structure in which abrasive grains carried in and/or on an elastic body made from material with low rebound elasticity for polishing the surface of the workpiece formed with the recess-protrusion profile so as to achieve an arithmetic average roughness Ra of not greater than 1.6 ?m on the surface of the protrusions and the recesses on the workpiece while maintaining the recess-protrusion profile formed by the first blasting.

Abstract: To provide an impeller for use in a blasting apparatus and being capable of more efficiently accelerating abrasives. An impeller 30 has an external shape of a circular disk shape with a predetermined thickness, and has an abrasive entry port 31. Plural abrasive flow channels 32 are formed at predetermined spacings around the circumferential direction of the impeller 30 so as to pass through within the thickness. Each of the abrasive flow channels 32 has an inlet 32a communicated with the abrasive entry port 31 and an outlet 32b opening onto an outer peripheral face. These abrasive flow channels 32 are provided so as to be greatly inclined with respect to a radial direction of the impeller 30 such that an end on the outlet 32b side of the abrasive flow channel faces rearward in a rotation direction of the impeller.

Abstract: A cutting edge of a machining tool and a surface treatment method for the same. A cutting edge of a machining tool and a region in the vicinity of the cutting edge, e.g. a region of at least 1 mm and preferably at least 5 mm from the cutting edge, are defined as a treatment region; and substantially spherical injection granules having a median diameter of 1 to 20 ?m are injected onto the treatment region with an injection pressure of 0.01 MPa to 0.7 MPa in order for dimples having an equivalent diameter of 1 to 18 ?m and preferably 1 to 12 ?m, and a depth at least equal to 0.02 ?m and at most equal to 1.0 ?m to be formed such that the projected surface area of the dimples is at least equal to 30% of the surface area of the treatment region.

Abstract: A surface treatment method capable of continuously forming a uniform nanocrystalline structure along the surface of a metal product regardless of whether the metal product is hard or soft. A substantially spherical spray powder that has a median diameter of 1-20 ?m and a fall velocity in the air of 10 sec/m or more is sprayed onto a metal product at a spray pressure of 0.05-0.5 MPa. Thus, even when the metal product is made of a soft material, it is possible to form a uniform continuous nanocrystalline structure layer in which nanocrystals are micronized to an average crystal grain size of not more than 300 nm, preferably not more than 100 nm, without forming a laminar worked structure, impart a high compression residual stress of from about ?180 MPa up to the order of ?1200 MPa, and strengthen the surface of the metal product.

Abstract: The present invention is directed to provide a method of forming dimples comparatively simply on a surface of hard-brittle materials such as ceramics by post-processing. In the method, substantially spherical ejection particles having a median diameter d50 of from 1 ?m to 20 ?m are ejected together with a compressed gas at an ejection pressure of from 0.01 MPa to 0.7 MPa against a dimple formation region which is a region where dimples are to be formed on a surface of an article made from a hard-brittle material or a surface of an article having a surface coated with a coating layer of a hard-brittle material, or the like so as to form dimples on the surface of the hard-brittle material by plastic deformation without occurrences of breaks or cracks.

Abstract: A surface treatment method is provided that is capable of raising the slidability of a ceramic surface at low cost using a comparatively simple method. Dimples are formed on a surface of a treatment region, this being a portion of a ceramic surface where surface treatment is to be performed, by ejecting substantially spherical ejection particles having a median diameter of from 1 ?m to 20 ?m, together with compressed gas at an ejection pressure of from 0.01 MPa to 0.7 MPa, so as to achieve a value of a fastest decay autocorrelation length of not less than 10. The dimples are formed so as to have a plan view profile with a ratio between a horizontal Feret diameter and a vertical Feret diameter of from 0.7 to 1.43. Thereby a ceramic surface with improved slidability can be obtained regardless of use or non-use of a lubricant.