Abstract: A casting mold is provided with a cavity portion and an overflow portion, and the overflow portion is connected to a gas flow path (suction path). A valve (an on-off valve, a shut-off valve) is provided between the gas flow path and the overflow portion. A heating method for a casting mold includes a step of setting the pressure in the cavity portion to a second pressure by sucking gas in the overflow portion and in the cavity portion while the valve is kept open for a second time period shorter than a first time period during casting. The heating method further includes a step of heating the casting mold by supplying molten metal into the cavity portion set at the second pressure, and solidifying the molten metal.

Abstract: A cap member is used in a shut-off valve including a valve head in which a through hole is formed, the cap member including: a cap member main body screwed into the through hole; a first engaging portion for engaging with a first tool for screwing the cap member main body into the valve head; a second engaging portion formed inside the cap member main body to engage with a second tool for unscrewing the cap member main body from the valve head; and a wall portion covering the second engaging portion so that the second engaging portion is not exposed when the cap member is viewed from the first engaging portion toward the second engaging portion.

Abstract: A gas suction device of a casting mold includes an overflow portion, a suction path, and a shut-off valve. The shut-off valve includes a housing section for housing a valve element. An upstream-side housing portion of the housing section has an arc-shaped outer peripheral edge. The overflow portion includes an introduction path which is continuous with the upstream-side housing portion and guides gas to the upstream-side housing portion. At a predetermined location on the outer peripheral edge, the introduction path is connected to the upstream-side housing portion along the tangential direction of the outer peripheral edge.

Abstract: A casting mold is provided with a cavity portion and an overflow portion, and the overflow portion is connected to a gas flow path (suction path). A valve (an on-off valve, a shut-off valve) is provided between the gas flow path and the overflow portion. A heating method for a casting mold includes a step of setting the pressure in the cavity portion to a second pressure by sucking gas in the overflow portion and in the cavity portion while the valve is kept open for a second time period shorter than a first time period during casting. The heating method further includes a step of heating the casting mold by supplying molten metal into the cavity portion set at the second pressure, and solidifying the molten metal.

Abstract: A gas suction device of a casting mold includes an overflow portion, a suction path, and a shut-off valve. The shut-off valve includes a housing section for housing a valve element. An upstream-side housing portion of the housing section has an arc-shaped outer peripheral edge. The overflow portion includes an introduction path which is continuous with the upstream-side housing portion and guides gas to the upstream-side housing portion. At a predetermined location on the outer peripheral edge, the introduction path is connected to the upstream-side housing portion along the tangential direction of the outer peripheral edge.

Abstract: A casting mold includes a cavity portion, a gas flow path, and a shut-off valve capable of blocking the gas flow path. An inspection method for the casting mold includes: a step of, when the casting mold is cold, supplying air having a predetermined pressure into the gas flow path while the shut-off valve is closed, and thereafter stopping supply of the air; a step of acquiring a cold time pressure reduction rate of the air in the gas flow path after the supply of the air is stopped; and a step of determining whether the cold time sealing performance of the shut-off valve is good, based on the cold time pressure reduction rate.

Abstract: A cap member is used in a shut-off valve including a valve head in which a through hole is formed, the cap member including: a cap member main body screwed into the through hole; a first engaging portion for engaging with a first tool for screwing the cap member main body into the valve head; a second engaging portion formed inside the cap member main body to engage with a second tool for unscrewing the cap member main body from the valve head; and a wall portion covering the second engaging portion so that the second engaging portion is not exposed when the cap member is viewed from the first engaging portion toward the second engaging portion.

Abstract: A casting mold and a production method thereof with which exfoliation of coating is controlled and liquidity of molten metal can be maintained are provided. This casting mold 1 includes a surface processing part 3 in which a plurality of groove parts 5 of a grid groove 4 formed in a surface of a molten metal contact part of a mold material 2 is coated with a carbon film 6. In this surface processing part 3, a width W1 of the groove parts 5 is 35 ?m or narrower, skewness Ssk of three-dimensional surface roughness is in a range of ?0.8 to ?0.2, and indentation hardness of the carbon film 6 tested by a nanoindenter is 1000 N/mm2 or higher. With this arrangement, it is possible to optimize the surface processing part 3 in such a manner that a penetration rate of the molten metal (aluminum 10) is controlled to be low and the coating (carbon film 6) is unlikely to exfoliate from the groove parts 5.

Abstract: A casting mold and a production method thereof with which exfoliation of coating is controlled and liquidity of molten metal can be maintained are provided. This casting mold 1 includes a surface processing part 3 in which a plurality of groove parts 5 of a grid groove 4 formed in a surface of a molten metal contact part of a mold material 2 is coated with a carbon film 6. In this surface processing part 3, a width W1 of the groove parts 5 is 35 ?m or narrower, skewness Ssk of three-dimensional surface roughness is in a range of ?0.8 to ?0.2, and indentation hardness of the carbon film 6 tested by a nanoindenter is 1000 N/mm2 or higher. With this arrangement, it is possible to optimize the surface processing part 3 in such a manner that a penetration rate of the molten metal (aluminum 10) is controlled to be low and the coating (carbon film 6) is unlikely to exfoliate from the groove parts 5.

Abstract: In a slide fastener (1) according to the invention, each fastener element (10, 10?, 30, 40) includes an upper half element portion (11, 31, 41) disposed at a first surface side of a fastener tape (2) and a lower half element portion (21) disposed at a second surface side of the fastener tape (2). The upper half element portion (11, 31, 41) includes a first tape-sandwiching portion (12, 32, 42) and a first head portion (13, 13?, 33, 43) of a tapered form that extends from the first tape-sandwiching portion (12, 32, 42). The upper half element portion (11, 31, 41) has a tapered portion (14, 34, 44) that gradually decreases in a dimension between front and rear side surfaces, in the tape length direction, of at least the first tape-sandwiching portion (12, 32, 42) as it goes upward. According to the slide fastener (1) of the invention, each fastener element (10, 10?, 30, 40) can be formed lightweight, and the fastener element (10, 10?, 30, 40) can be given an appearance looking like a metal fastener element.

Abstract: A casting die applied with laser machining and carbon-film coating on a die surface is provided with multiple grooves formed spaced at a predetermined pitch by the laser machining; multiple ridges between the multiple grooves; and multiple carbon portions buried in the multiple grooves by the carbon-film coating, wherein the die surface with the ridge and the carbon portion alternately disposed is configured such that molten metal flows thereon; the grooves are 45 ?m or less in opening width and 60 ?m or more in depth; and the ridge has, on a top surface thereof applied with the laser machining, multiple micro-grooves for reducing a contact area with the molten metal. The casting die is aimed to balance expanding the groove width and increasing a thickness of the carbon film and to achieve suppression of the molten metal entering into the groove and exfoliation of the carbon film.

Abstract: In a slide fastener according to the invention, each fastener element includes an upper half element portion disposed at a first surface side of a fastener tape and a lower half element portion disposed at a second surface side of the fastener tape. The upper half element portion includes a first tape-sandwiching portion, a first head portion of a tapered form, and a thin walled portion which has a downward inclined surface that is inclined downward toward the forefront of the first head portion from the thin walled start portion set on the upper half element portion to the first head portion side. Thereby, the fastener element can be formed lightweight and can make coupling breaking difficult to occur.

Abstract: The present invention provides a grease composition which has excellent conductivity and can rapidly remove static electricity generated by using a bearing. The grease composition comprises a base oil, a thickener and a tungsten disulfide powder, wherein the average particle diameter of the tungsten disulfide powder is 0.5 to 5.0 ?m and the amount of tungsten disulfide powder based on 100 parts by mass of the total amount of base oil and thickener is 2.0 to 4.0 parts by mass.

Abstract: A casting die applied with laser machining and carbon-film coating on a die surface is provided with multiple grooves formed spaced at a predetermined pitch by the laser machining; multiple ridges between the multiple grooves; and multiple carbon portions buried in the multiple grooves by the carbon-film coating, wherein the die surface with the ridge and the carbon portion alternately disposed is configured such that molten metal flows thereon; the grooves are 45 ?m or less in opening width and 60 ?m or more in depth; and the ridge has, on a top surface thereof applied with the laser machining, multiple micro-grooves for reducing a contact area with the molten metal. The casting die is aimed to balance expanding the groove width and increasing a thickness of the carbon film and to achieve suppression of the molten metal entering into the groove and exfoliation of the carbon film.

Abstract: A slide fastener includes a pair of first and second separable interfitting parts fixed to first and second fastener stringers. The first separable interfitting part includes a slider-holding part, and the second separable interfitting part is configured to be insertable/removable into/from the slider held on the slider-holding part through the tape insertion gap. A protruding part is arranged at a front end of the second separable interfitting part. A width dimension A of the protruding part, a dimension B between a back end of a side surface of the protruding part and an opposed end on a side opposite to the first separable interfitting part, and a dimension C between a guide post and a flange of the slider have a relationship of A<C<B.

Abstract: In a slide fastener (1) according to the invention, each fastener element (10, 10?, 30, 40) includes an upper half element portion (11, 31, 41) disposed at a first surface side of a fastener tape (2) and a lower half element portion (21) disposed at a second surface side of the fastener tape (2). The upper half element portion (11, 31, 41) includes a first tape-sandwiching portion (12, 32, 42) and a first head portion (13, 13?, 33, 43) of a tapered form that extends from the first tape-sandwiching portion (12, 32, 42). The upper half element portion (11, 31, 41) has a tapered portion (14, 34, 44) that gradually decreases in a dimension between front and rear side surfaces, in the tape length direction, of at least the first tape-sandwiching portion (12, 32, 42) as it goes upward. According to the slide fastener (1) of the invention, each fastener element (10, 10?, 30, 40) can be formed lightweight, and the fastener element (10, 10?, 30, 40) can be given an appearance looking like a metal fastener element.

Abstract: In a slide fastener according to the invention, each fastener element includes an upper half element portion disposed at a first surface side of a fastener tape and a lower half element portion disposed at a second surface side of the fastener tape. The upper half element portion includes a first tape-sandwiching portion, a first head portion of a tapered form, and a thin walled portion which has a downward inclined surface that is inclined downward toward the forefront of the first head portion from the thin walled start portion set on the upper half element portion to the first head portion side. Thereby, the fastener element can be formed lightweight and can make coupling breaking difficult to occur.

Abstract: A slide fastener where each fastener element includes an upper half element portion disposed at a first surface side of a fastener tape and a lower half element portion disposed at a second surface side of the fastener tape. The upper half element portion includes a first tape-sandwiching portion and a first head portion of a tapered form that extends from the first tape-sandwiching portion. The upper half element portion has a tapered portion that gradually decreases in a dimension between front and rear side surfaces, in the tape length direction, of at least the first tape-sandwiching portion as it goes upward. Each fastener element can be lightweight, and the fastener element can look like a metal fastener element.

Abstract: A slide fastener according to the invention includes a pair of first and second separable interfitting parts fixed to first and second fastener stringers. A protruding part is arranged at a front end of the second separable interfitting part and if a width dimension of the protruding part is defined as a first dimension A, a dimension between a back end of a side surface of the protruding part and an opposed end on a side opposite to the first separable interfitting part is defined as a second dimension B, and a dimension between a diamond and a flange of the slider is defined as a third dimension C, the protruding part has a relationship of the first dimension A<the third dimension C<the second dimension B. Accordingly, when the second separable interfitting part is held in a normal position, element rows can smoothly be interlocked.

Abstract: A slide fastener where each fastener element includes an upper half element portion disposed at a first surface side of a fastener tape and a lower half element portion disposed at a second surface side of the fastener tape. The upper half element portion includes a first tape-sandwiching portion and a first head portion of a tapered form that extends from the first tape-sandwiching portion. The upper half element portion has a tapered portion that gradually decreases in a dimension between front and rear side surfaces, in the tape length direction, of at least the first tape-sandwiching portion as it goes upward. Each fastener element can be lightweight, and the fastener element can look like a metal fastener element.