Nakanishi Metal Works Co., Ltd.

Other

Otics Corporation

Michiyuki Kamiji

Masayoshi Nakamura

Hiroyuki Maeda

Yoshihiro Ito

Yoshio Kawatake

Koichi Hashimoto

Tetsuaki Numata

Takaaki Ikeda

Yusuke Iizawa

Takahiko Sato

Kenji Teshima

Shinichi Akashi

Nobumasa Oka

Yoshihiro Itoh

Toshinari Komai

Masaki Okano

Yasuki Yabubayashi

Tomomi Hosokawa

Takashi c/o Nakanishi Metal Works Co Ltd Kaneike

A magnetic encoder in which a support member and a plastic magnet do not adhere to each other is manufactured using a mold. The plastic magnet has a turning molded portion on the outer circumferential side thereof. The gate of the mold is an inner-diameter-side disk gate and a length L thereof in the axial direction is in a range of 0.2 mm&#x2264;L&#x2264;0.6 mm. The tensile strength of the material of the plastic magnet is 65 MPa or more and the Young's modulus thereof is 4000 MPa or more and 15000 MPa or less. The method includes a step of opening the mold and placing the support member as an insert object in the mold, and a step of closing the mold and injecting a melted material of the plastic magnet into a cavity through the disk gate.

Magnetic encoder manufacturing method

A radial gap between an outer circumferential surface of an encoder member joined to an outward flange portion of a slinger and an inner circumferential surface of a seal body includes a first gap portion and a second gap portion closer to an inward flange portion of a core metal than the first gap portion is. The outer circumferential surface that defines the first gap portion is a cylindrical outer circumferential surface, and the radial gap in the first gap portion is substantially constant in an axial direction. The outer circumferential surface that defines the second gap portion is a conical outer circumferential surface reduced in diameter as approaching the inward flange portion of the core metal in the axial direction, and the radial gap in the second gap portion is gradually increased as approaching the inward flange portion of the core metal in the axial direction.

Rotary seal

The present invention is intended to provide an injection molding die that improves the strength of adhesion between an insert and a plastic in an insert molded article while suppressing fluctuations in the strength of adhesion. An injection molding die is used to manufacture an insert molded article by placing an insertwith a thermoset resin adhesive in the molding die and injecting a molten plastic material P from a gate G into a cavity C. The gate G is arranged at a position separated by 0.2 mm or more in an out-of-plane direction from a surface Aof the adhesive applied to the joining surface of the insert. During injection molding, the wall surface shear stress generated on the adhesive applied to the joining surface of the insertrelative to the plastic near the gate G becomes small. The adhesive is not swept away by the high-pressure molten plastic material P without having to bring the adhesive applied to the joining surface A of the insertinto the semi-cured state. Accordingly, it is possible to conduct injection molding without bringing the adhesive into the semi-cured state.

Manufacturing method of insert molded article

A roller bearing cage (A) is configured such that a pair of ring parts () axially separated from each other is connected by column parts () sliding on outer peripheral surfaces of rollers (RA), and pocket holes (P) are evenly formed to store and hold the rollers (RA) in a peripheral wall portion in a circumferential direction. The cage (A) is manufactured such that a base body () including the ring part () and the column parts () with square columnar convexes (A) and a connection body () including the ring part () with square holes (A) are set as separate members.

Roller bearing cage and manufacturing method therefor as well as roller bearing manufacturing method

The present invention provides a rocker arm manufacturing method capable of improving the durability and excellent in productivity. In the method according to the present invention, an intermediate producthaving both side wallsextended in a predetermined direction and arranged in parallel with each other and one end side connection wallconnecting lower ends of a longitudinal one end of both the side walls is obtained. Next, both side wallsformed at the one end of the intermediate productare inwardly bent. Thereafter, ironing diesare pressed down against outer surfaces of both the inclined side wallsfrom an upper side to a lower side to execute ironing of outer surface portions of both the side wallsto downwardly plastically fluidize the constituent material of both the side wallsto thereby form valve stem guide wallsat both sides of the one end side connection wallin a downwardly protruded manner.

Method for manufacturing rocker arm

A method for manufacturing according to the present invention includes a step of obtaining a bent workpiecewith prepared aperturesand, wherein the bent work pieceincludes a pair of side wallsanddisposed in parallel with each other and connecting wallsandfor connecting the side wallsand, the pair of side wallsan deach having a prepared aperture, and a step of forming a roller supporting shaft fixing apertureby inserting a sizing punchinto the prepared aperture, wherein the sizing punchhas a tapered push enlarging portionat a tip end portion, a basal end side of the push enlarging portion being larger than the prepared aperturein diameter, and a tip end side of the push enlarging portionbeing smaller than the prepared aperturein diameter, whereby the push enlarging portioncauses plastic flow of an inner peripheral portion of the prepared aperture to finish the inner peripheral surface of the prepared aperture to thereby obtain a roller supporting shaft fixing aperture. By this structure, sufficient shaft holding ability can be given to the roller supporting shaft fixing aperture, and a rocker arm can be manufactured at low costs.

A method for manufacturing a one-way clutch cage allows slits of the cage to be formed with a short punching distance, wherein the slits are narrow in width and the cage is less prone to deformation. In this method for manufacturing a one-way clutch cage, after slits,have been formed, windows,are formed and then an outer annular part,is cut. Therefore, since the slits can be formed in a cylindrical member,that has not yet been subjected to the window formation process of the outer annular part cut-out process, and that is sufficiently strong, a radially diagonal punching operation can be performed to form the slits. During this radially diagonal punching operation, a boundary portion between a cylindrical portion,and an outer flange,is punched out from an inside of the cylindrical member toward an outside of the cylindrical member. Thus, the punching distance can be shortened, the punching die can be thinned in thickness and the slit width can be reduced, as compared with horizontal punching.

Method for manufacturing a one-way clutch cage

A vulcanized sheet S1 having formed therein annular articles P1 is prepared at first, which sheet comprises thick external bridges (16) in a thin annular zone (14) and at regular angular intervals so that the bridges connect an external flash (13) to a body (15) of the sheet. A recess (22) is formed centrally of an inner waste (20) surrounded by each article. Then, a guide lug (34) is inserted in the recess to correctly position the article, before tearing by of a first punch (35) an inner breakable boundary (26) intervening between the article and the inner waste so as to remove the inner waste from the article. Next, a further guide lug (44) is inserted in a space from which the inner waste has been removed, a die having a bore (31a) of a diameter larger than the article supports the sheet, and finally a second punch (45) tears an outer breakable boundary (12) to separate the article from the sheet.

Vulcanized sheet comprising annular rubber articles, a method of and an

A vulcanized sheet S1 having formed therein annular articles P1 is prepared at first, which sheet comprises thick external bridges (16) in a thin annular zone (14) and at regular angular intervals so that the bridges connect an external flash (13) to a body (15) of the sheet. A recess (22) is formed centrally of an inner waste (20) surrounded by each article. Then, a guide lug (34) is inserted in the recess to correctly position the article, before tearing by means of a first punch (35) an inner breakable boundary (26) intervening between the article and the inner waste so as to remove the inner waste from the article. Next, a further guide lug (44) is inserted in a space from which the inner waste has been removed, a die having a bore (31a) of a diameter larger than the article supports the sheet, and finally a second punch (45) tears an outer breakable boundary (12) to separate the article from the sheet.

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Osaka, Japan

Michiyuki Kamiji