Abstract: A Ni base alloy pipe stock having a chemical composition comprising, by mass %, C?0.04%, Si?0.50%, Mn: 0.01 to 6.0%, P?0.03%, S?0.01%, Cr: 15 to 30%, Ni: more than 45% to not more than 60%, Mo: 0 to 18%, W: 0 to 36%, with Mo(%)+0.5W(%): more than 1.5% to not more than 18%, Cu: 0.01 to 1.5%, Al?0.01% and N: 0.0005 to 0.20%, and the balance substantially being Fe, with 1380?5000P?100S?4400C?1300, Ni+10(Mo+0.5W)+100N?200, (Ni?50)+10(N?0.1)?2(Cr?25)?5(Mo+0.5W?6)+12?0, can be manufactured into a seamless pipe by use of a Mannesmann piercing and rolling mill because of its excellent inner surface properties. The resulting seamless pipe has excellent mechanical properties and moreover has excellent corrosion resistance in a sour gas environment, and thus, the Ni base alloy pipe stock can be used as a pipe stock for oil country tubular goods and line pipes and further as a pipe stock for various structural members of nuclear power plants and chemical industrial plants.

Abstract: An Fe—Ni alloy pipe stock having a chemical composition comprising, by mass %, C?0.04%, Si?0.50%, Mn: 0.01 to 6.0%, P?0.03%, S?0.01%, Cr: 20 to 30%, Ni: 30 to 45%, Mo: 0 to 10%, W: 0 to 20%, with Mo(%)+0.5W(%): more than 1.5% to not more than 10%, Cu: 0.01 to 1.5%, Al?0.01% and N: 0.0005 to 0.20%, and the balance substantially being Fe, with 1440?6000P?100S?2000C?1300, Ni+10(Mo+0.5W)+100N?120, (Ni?35)+10(N?0.1)?2(Cr?25)?5(Mo+0.5W?3)+8?0, can be manufactured into a seamless pipe by use of a Mannesmann piercing and rolling mill because of its excellent inner surface properties. The resulting seamless pipe has excellent mechanical properties and moreover has excellent corrosion resistance in a sour gas environment, and thus, the Fe—Ni alloy pipe stock can be used as a pipe stock for oil country tubular goods and line pipes and further as a pipe stock for various structural members of nuclear power plants and chemical industrial plants.

Abstract: A seamless tube producing method uses a piercing/rolling plug wherein piercing/rolling is performed with an inclined rotary piercing mill while the seamless tube piercing/rolling plug is used as a piercing tool. In one mode, a front part and a rear part of the split plug are held as an integral plug, the front part being made of low alloy steel, and oxide films are formed on surfaces of the front part and rear part. In a second mode, the front part and/or rear part are replaceable via a removable mounting wherein a mandrel bar holding the plug goes through the rear part, the mandrel bar being coupled with the front part. A thickness of the oxide film formed in the front part can be 200 ?m or more and the oxide film of the front part can be thicker than the oxide film of the rear part.

Abstract: A pierced shell of an austenitic stainless steel having a good inner surface condition is provided, and a means is established which can perform mass production on an industrial scale of a good quality seamless steel pipe of stainless steel. An austenitic stainless steel billet with a P content of at most 0.040% and an S content of at most 0.020% is pierced under conditions such that the pipe expansion ratio H (outer diameter of shell/diameter of billet to be worked) satisfies the following equation to obtain a tube shell of an austenitic stainless steel. {P(%)/(0.025×H?0.01)}2+{S(%)/(0.015×H?0.01)}2?1 When manufacturing a seamless steel pipe of an austenitic stainless steel, the above-described shell is rolled to form a pipe.

Abstract: A method of manufacturing a seamless tube by the invention can duly control the rotary forging effect without miss-rolling such as defective onset engagement with rolls by satisfying either of (1)–(3) formulas below, dependent on a given range of roll diameter ratio Dg/D1, prevent the occurence of internal surface flaws at the top of the work material attributable to deteriorated hot workability, and further prevent the occurrence of said flaws over the remaining length without altering parameters for piercing-rolling process. Thus, the invention can be widely utilized as an excellent manufacturing method for said tube: in case of Dg/D1<1.1, 23?N/(Df/100)?40,??(1) in case of 1.1?Dg/D1<1.5, 20?N/(Df/100)?44,??(2) in case of 1.5?Dg/D1?1.8, 20?N/(Df/100)?48.

Abstract: A method of manufacturing a seamless tube by the invention can duly control the rotary forging effect without miss-rolling such as defective onset engagement with rolls by satisfying either of (1)-(3) formulas below, dependent on a given range of roll diameter ratio Dg/D1, prevent the occurence of internal surface flaws at the top of the work material attributable to deteriorated hot workability, and further prevent the occurrence of said flaws over the remaining length without altering parameters for piercing-rolling process. Thus, the invention can be widely utilized as an excellent manufacturing method for said tube: in case of Dg/D1<1.1, 23?N/(Df/100)?40 ??(1) in case of 1.1 ?Dg/D1<1.5, 20?N/(Df/100)?44 ??(2) in case of 1.5?Dg/D1?1.

Abstract: The present invention relates to a making method for a seamless metallic tube with a tilting roll type piercing rolling mill (piercer). According to the making method for a seamless metallic tube of the present invention, the rotary forging effect and the circumferential shearing strain can be significantly suppressed without generating uncompleted engagement of a billet. Accordingly, a product having reduced inside defects and excellent inside quality can be produced in high productivity. Further, by strengthening a plug nose rolling portion, a sharpened plug nose is obtained and an engagement limit can be increased. Additionally, a product further excellent in the inside quality can be efficiently produced. Accordingly, the present invention can be applied to wide fields of the piercing rolling of the seamless metallic tube.

Abstract: The present invention relates to a making method for a seamless metallic tube with a tilting roll type piercing rolling mill (piercer). According to the making method for a seamless metallic tube of the present invention, the rotary forging effect and the circumferential shearing strain can be significantly suppressed without generating uncompleted engagement of a billet. Accordingly, a product having reduced inside defects and excellent inside quality can be produced in high productivity. Further, by strengthening a plug nose rolling portion, a sharpened plug nose is obtained and an engagement limit can be increased. Additionally, a product further excellent in the inside quality can be efficiently produced. Accordingly, the present invention can be applied to wide fields of the piercing rolling of the seamless metallic tube.

Abstract: A vibrating linear actuator includes a mover having a permanent magnet, a stator having coils, a base on which the stator is mounted, a cover, and lands electrically coupled to the coils. The lands are provided on the surface of one of the base or the cover.

Abstract: An apparatus for checking a film for defects having a pair of polarizers placed on the opposite sides of the film to be checked, an illumination light source placed outside the pair of polarizers, a light receiving device placed outside the pair of polarizers and opposite from the illumination light source, and a correction film having substantially the same birefringent characteristics as a portion of the film to be checked having no optical defects. A direction in which the correction film is to be positioned is previously set according to the birefringent characteristics of the film to be checked. The correction film is placed between one of the pair of polarizers and the film to be checked. A luminance signal of light emits from the illumination light source, transmits through the film to be checked, the correction film and the pair of polarizers and is then obtained by the light receiving device to check the film for optical defects.

Abstract: A slim and efficient vibrating linear actuator includes a stator which sandwiches a coil generating vibrating magnetic field, and a first teeth section and a second teeth section. A mover, including a permanent magnet, is linked to the stator by elastic bodies and energized substantially to a midpoint between the first and second teeth sections. When the mover faces both of the first teeth section and the second teeth section, electric current is supplied to the coil, and when the mover faces only one of the first teeth section or the second teeth section, no electric current is supplied to the coil. This structure allows the vibrating linear actuator to be slimmed down and operate efficiently. A portable information apparatus employing this actuator can be slimmed down and work efficiently.

Abstract: A vibrating linear actuator includes a mover formed of an outer yoke having a heavy body, and a magnet. The actuator also includes a stator formed of an inner yoke having a coil and generating vibrating magnetic field to the outer yoke, and leaf springs, i.e., an elastic body, that couple the inner yoke to the outer yoke. The outer yoke is placed outside the inner yoke. This structure allows adjusting a magnitude of vibration of the actuator by simply changing a size of the outer yoke.

Abstract: A linear actuator includes a mover equipped with an outer yoke and a magnet, a stator equipped with coils and an inner yoke, and leaf springs for linking the movable section and the stator. The actuator is assembled such that the leaf springs are deformed when the mover stays at a balanced position. This structure can maximize a vibration stroke of the mover.

Abstract: A vibrating linear actuator includes a mover having a permanent magnet, a stator having coils, a base on which the stator is mounted, a cover, and lands electrically coupled to the coils. The lands are provided on the surface of one of the base or the cover.

Abstract: An apparatus for checking a film for defects has a pair of polarizers placed on the opposite sides of the film to be checked, an illumination light source placed outside the pair of polarizers, a light receiving device placed outside the pair of polarizers and opposite from the illumination light source, and a correction film having substantially the same birefringent characteristics as a portion of the film to be checked having no optical defects. A direction in which the correction film is to be positioned is previously set according to the birefringent characteristics of the film to be checked. The correction film is placed between one of the pair or polarizers and the film to be checked. A luminance signal of light emitted from the illumination light source, transmitted through the film to be checked, the correction film and the pair of polarizers is obtained by the light receiving device to check the film for optical defects.

Abstract: A piercing and rolling method involves the use of a piercer provided with cone-shaped main rolls and disk rolls. When a piercing and rolling operation is performed at an expansion ratio of 1.15 or more, the following relations (1), (2), (3), (4), and (5) are satisfied:3.ltoreq.D1/d.ltoreq.7 (1)9.ltoreq.D2/d.ltoreq.16 (2)2<D2/D1.ltoreq.3 (3)2.5.degree..ltoreq..theta.1.ltoreq.4.5.degree. (4),and3.degree. .ltoreq..theta.2.ltoreq.6.5.degree. (5).wherein D1: diameter of the gorge portion of a main roll; D2: diameter at the grooved portion of a disk roll; d: outer diameter of a billet; .theta. 1: inlet face angle of a main roll, and .theta. 2: outlet face angle of a main roll. The apparatus of the present invention is designed so that D1 is between 510 and 2000 mm inclusive and D2 is between 1,530 and 4,000 mm inclusive, and that the above-described relations (3), (4), and (5) are satisfied.

Abstract: A process for the preparation of a cellulose acetate film comprises the steps of: cooling a mixture of cellulose acetate and an organic solvent to -100.degree. to -10.degree. C.; warming the cooled mixture to 0.degree. to 50.degree. C. to dissolve the cellulose acetate in the organic solvent; casting the obtained solution on a support; and evaporating the organic solvent to form the cellulose acetate film. The cellulose acetate has an average acetic acid content in the range of 58.0 to 62.5%. The organic solvent is acetone.

Abstract: A cellulose acetate solution has cellulose acetate in a solvent. The cellulose acetate has an average acetic acid content in the range of 58.0 to 62.5%. In the first embodiment of the invention, the solvent is a mixture of acetone and another organic solvent. The organic solvent is an ether having 3 to 12 carbon atoms, a ketone having 4 to 12 carbon atom, an ester having 3 to 12 carbon atoms, or an alcohol having 1 to 6 carbon atoms. In the second embodiment, the solvent is the ether, the ketone or the ester. Processes for the preparation of the solution and a cellulose acetate film are also disclosed.

Abstract: A method for manufacturing seamless steel tubes by the Mannnesmann tube making process wherein a billet is passed through a piercer and the center of the billet is pierced through to obtain a hollow shell. A pair of disk rolls are disposed to incline by a skew angle .delta. with respect to a pass line toward cone-type main roll located at the entry side, where a material to be rolled enters into the disk roll sliding face, thereby to become unparallel with the outlet face angle of the main roll, while the skew angle .delta. is set to satisfy the following conditions related to the skew angle .delta., the inlet face angle .theta.1 and the outlet face angle .theta.2 of the main roll, thereby to obtain expansion ratio of outer diameter of 1.15 or higher value..theta.2+2.degree.<.delta.<9.degree., .delta.+.theta.1<12.degree.

Abstract: A method for the manufacture of a hollow fiber membrane by mixing polypropylene, an organic filler capable of uniformly dispersing in the polypropylene in a fused state and easily dissolving in an extractant being used, and a crystal seed forming agent. The resulting mixture, in a molten state, is discharged in the shape of a hollow fiber through an annular spinning nozzle and into contact with a liquid made of said organic filler or a compound similar thereto. This results in cooling and solidifying the hollow fiber, which is then forwarded into contact with an extractant incapable of dissolving polypropylene, to remove the organic filler and form the membrane.