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AssigneeFuji Die Co., Ltd.
InventorsIsao Nakada, Takao Kobayashi
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In a composite roll for manufacturing heat transfer tubes that has two or more grooving rolls having protrusions where at least one of cross sectional shapes, lead angles relative to a rotation direction and sizes is different, by coaxially combining the rolls to form multiple types of grooves on a surface of metallic strips by pressing against the metallic strips, the composite roll for manufacturing heat transfer tubes of the present invention is characterized in that the two or more grooving rolls are joined in one body in a mutually surface contacting state. It is also preferable that the two or more grooving rolls are joined by diffusion bonding.
A composite roll for manufacturing heat transfer tubes, comprising two or more grooving rolls that have protrusions where at least one of cross sectional shapes, lead angles relative to a rotation direction and sizes is different, by coaxially combining the rolls, to form multiple types of grooves on a surface of metallic strips by pressing against the metallic strips;
A method of manufacturing a composite roll for manufacturing heat transfer tubes, wherein after coaxially combining two or more grooving rolls that consist of a tungsten carbide-based cemented carbide and that have protrusions where at least one of cross sectional shapes, lead angles relative to a rotation direction and sizes is different, the combined grooving rolls are joined by pressing and heating at the same time.
Dependencies are inferred from the claim text.