US 9,855,594 B2 · Threaded rebar manufacturing process and system

Abstract

Embodiments of the invention comprise forming a billet from molten steel and hot rolling the billet to reduce the cross sectional area of the billet. Thereafter, the billet is hot rolled into a lead pass bar having a cross-sectional area comprising a reduced width dimension located adjacent to the center longitudinal axis of the bar. In one embodiment of the invention, the billet can be formed into a lead pass bar having a cross-sectional area in the shape of an hourglass or peanut by feeding the billet through a first set of rolls. After the lead pass bar is formed, it is passed through a second set of rolls in order to form the substantially continuous threaded rebar without longitudinal ribs. The cross-sectional area of the lead pass bar helps to produce a substantially continuous threaded rebar product without longitudinal ribs using standard rebar manufacturing tooling and equipment.

Claims20

Dependent claims

A method of manufacturing threaded rebar comprising:

providing a lead pass bar comprising a body extending along a longitudinal axis, wherein at least one portion of the body has a cross-section defining a plane that intersects the longitudinal axis, wherein a first part of the plane has a first width and a second part of the plane has a second width and wherein the first width is different than the second width, wherein the lead pass bar is formed in a first orientation in a lead pass bar roll set comprising two opposing lead pass cylindrical rollers;
and
forming a threaded rebar having substantially continuous threads from the lead pass bar by hot rolling in a single threaded pass roll set comprising two opposing threaded cylindrical rollers, wherein the threaded rebar is formed in a second orientation that is different from the first orientation, wherein the threaded rebar is formed without having to remove longitudinal ribs along at least a portion of the threaded rebar after hot rolling.

Dependencies are inferred from the claim text.

Threaded rebar manufacturing process and system

Life of this patent

Threaded rebar manufacturing process and system

Life of this patent

Abstract

Claims20