Nippon Steel Patente

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A blank (30, 30A, 30B) includes a plurality of steel sheets. The plurality of steel sheets are disposed and joined to form two elongated parts (34L, 34R) and a coupling part (35). The plurality of steel sheets include a first steel sheet (31) and a second steel sheet (32). An end part of the second steel sheet (32) forms an overlap part (361) with an end part of the first steel sheet (31). The overlap part (361) has a largest sheet thickness (t<max>) in the blank (30, 30A, 30B). A surface (311, 321) of at least one of the first steel sheet (31) and the second steel sheet (32) that is located on an outer side of the overlap part (361) is subjected to a treatment for increasing the emissivity compared with at least one of other surfaces of the plurality of steel sheets.

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Provided are a manufacturing device for a laminated core and a manufacturing method for a laminated core that facilitate the assembly of the adhesive applicator and reduce the time required for maintenance. The manufacturing device 1 for a laminated core 4 according to the present invention includes: an adhesive applicator 6 that applies an adhesive to portions of a steel sheet 2 corresponding to core sheets 3; a reciprocating drive portion 7 that switches whether or not to the adhesive is applied by the adhesive applicator 6; and a buffer member 8 that allows displacement of the adhesive applicator 6 in a reciprocating direction, wherein the adhesive applicator 6 has a discharge portion 60 that discharges the adhesive from a tip of a passage 60a, and when the application of the adhesive is performed, the adhesive applicator 6 is disposed such that the adhesive discharged from the tip of the discharge portion 60 is brought into contact with the steel sheet in response to an up and down movement of the steel sheet 2 accompanying the forming of the core sheets 3 by punching from the steel sheet 2, and the buffer member 8 is configured to adjust a contact pressure of the tip against the steel sheet 2.

A metallic material that has excellent scratch resistance and excellent corrosion resistance is provided. A metallic material (1) of the present disclosure includes a metallic substrate (10), a lower resin layer (20) formed on the metallic substrate (10), and an outermost resin layer (30) formed on the lower resin layer (20). A hardness HL of the lower resin layer (20) is 0.18 GPa or more. A hardness HH of the outermost resin layer (30) satisfies Formula (1), and a thickness TL (µm) of the lower resin layer and a thickness TH (µm) of the outermost resin layer satisfy Formula (2). HH / HL < 0.90 <img class="EMIRef" id="a4fef7e5-4efb-44b3-adf1-5587f285ef88-ia01" /> TL + TH > 3.0 <img class="EMIRef" id="a4fef7e5-4efb-44b3-adf1-5587f285ef88-ia02" />

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Provided are a manufacturing device for a laminated core and a manufacturing method for a laminated core that facilitate the assembly of the adhesive applicator and reduce the time required for maintenance. The manufacturing device 1 for a laminated core 4 according to the present invention includes an adhesive applicator 6 that applies an adhesive to portions of the steel sheet 2 corresponding to core sheets 3, and a reciprocating drive portion 7 that switches whether or not the adhesive is applied by the adhesive applicator 6, wherein the adhesive applicator 6 includes a discharge portion 60 configured to discharge the adhesive from a tip of a passage 60a, the adhesive applicator 6 or the discharge portion 60 is composed of a solid or non-porous organic resin member, and the passage 60a is defined by wall surfaces of the solid or non-porous organic resin, and when the application of the adhesive is performed, the adhesive applicator 6 is disposed such that the adhesive discharged from the tip of the discharge portion 60 is brought into contact with the steel sheet 2 in response to an up and down movement of the steel sheet 2 accompanying the forming of the core sheets 3 by punching from the steel sheet 2.

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A laminated core manufacturing apparatus, includes: an upper mold and a lower mold that press and punch out a core sheet from a strip-shaped steel sheet that is fed downstream; a lamination part that is provided at the lower mold and that bonds with an adhesive, and laminates, the punched-out core sheet; and an application part that is provided further toward an upstream side of the lower mold or the upper mold than the lamination part in a feeding direction of the strip-shaped steel sheet, and that applies the adhesive to one surface of the strip-shaped steel sheet, in which the application part has plural discharge ports that continuously discharge the adhesive, and the respective discharge ports are configured by a non-metallic material.

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Provided are a manufacturing device for laminated core and a manufacturing method for laminated core that can suppress unnecessary spreading of adhesive and reduce the risk of the adhesive entering unintended areas. The manufacturing device 1 for a laminated core according to the present invention is a manufacturing device 1 for manufacturing a laminated core 4 in which core sheets 3 having a predetermined shape are formed by punching from a steel sheet 2 and a predetermined number of the core sheets 3 are laminated and bonded, the manufacturing device 1 including: an adhesive applicator 14 that applies an adhesive 140 to portions 2a of the steel sheet 2 corresponding to the core sheets 3; and a punching portion 15 including a die including an upper die 130 and a lower die 131, the punching portion 15 being configured to punch out the core sheets 3 from the steel sheet 2 after the adhesive 140 has been applied by the adhesive applicator 14, wherein the upper die 130 or the lower die 131 comprises a recess 50 disposed at a position corresponding to the portion 2a where the adhesive 140 has been applied, and a vent 51 that communicates an internal space of the recess 50 with the outside of the upper die 130 or the lower die 131.

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Provided are a manufacturing device and a manufacturing method for a laminated core that can more reliably separate the laminated core from the group of core sheets and increase the punching speed of the core sheets. A manufacturing device 1 for a laminated core 4 according to the present invention is a manufacturing device 1 for a laminated core 4 in which core sheets 3 having a predetermined shape are formed by punching from a steel sheet 2 and a predetermined number of core sheets 3 are laminated and bonded, the manufacturing device 1 including: a punching portion 5 that punches out the core sheets 3 from the steel sheet 2; an adhesive application portion 6 that applies an adhesive to portions of the steel sheet 2 corresponding to the core sheets 3; a laminating portion 7 that laminates and bonds the core sheets 3 to which the adhesive has been applied to form a group of core sheets 30; and a separation portion 8 that bites into spaces between core sheets 3 adjacent to one another within the group of core sheets 30 to separate the laminated core 4 from the group of core sheets 30, wherein the laminating portion 7 includes a plurality of pairs of side pressure application portions 71 that apply a side pressure to the group of core sheets 30, each pair of side pressure application portions 71 is disposed to face each other with the group of core sheets 30 sandwiched therebetween, and at least one of the side pressure application portions 71 is configured to serve as the separation portion 8.