Abstract:
A method for producing rolled products includes providing two parallel lines downstream of a continuous casting, for conveying profiled supply sections that converge together at least at a single first rolling station. A plant for implementing the method is also provided.
Abstract:
A method for determining the stamping quality of profiled bar material, in particular of steel concrete-reinforcing bars, which is advanced in a rolling train, is provided, with the following steps: a) upstream of the rolling stand (3) performing the shaping, the initial speed VA of the starting product (1) provided with a stamping by shaping is determined and, if not yet known, the initial diameter DA and/or the initial cross-sectional area FA are determined contactlessly, b) after the rolling stand (3) performing the shaping, the final speed VE of the end product (2) is measured and the diameter DE and/or the cross-sectional area FE of a virtual enveloping shell for the end product (2) is/are determined contactlessly, c) of the end product (2), the diameter DN of a virtual, round end product is determined contactlessly as DN=square root of (DA2×VA/VE) and/or the average cross-sectional area FNE of the end product (2) is determined contactlessly as FNE=FA×VA/VE, d1) the characteristic stamping variable PKG is calculated on the basis of DE and DN and/or on the basis of FE and FNE, or d2) the values determined and calculated in steps a), b) and c) are used for calculating variables derived from them, if said derived variables are not yet known, the derived variables being: i) the initial volume and/or the initial weight per unit of length of the starting product (1), ii) the volume and/or the weight of the virtual enveloping shell per unit of length and iii) the volume of the end product (2) per unit of length and/or the weight of this volume of the end product (2), and e) the characteristic stamping variable PKG calculated according to step d1) or d2) is compared with a pre-set setpoint value PKGset. A device for carrying out the method is also provided. With the aid of the characteristic stamping variables PKG and PKGset, a rolling train can be controlled.
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.
Abstract:
Wire-rod hot-rolling machine (1) which comprises a plurality of roller-provided rolling units (2) which are arranged one after the other along the wire-rod feeding paths (p); the roller-provided rolling unit (2) being formed by a plurality of rolling-mills assemblies (3) each of which is provided with a pair of opposite, counter-rotating rolling mill rollers (4), which are arranged parallel and adjacent each other; said rolling-mills assemblies (3) being arranged one beside the other, coplanar to a corresponding reference plane locally perpendicular to the feeding paths (p), each at the feeding path (p) of a respective wire rod (b), and are oriented so that the rotation axes (R) of the rolling mill rollers (4) of the various rolling-mills assemblies (3) are locally parallel to one another while intersecting the lying plane of the feeding paths (p) of the wire rods with an inclination angle (3) greater than 5° and smaller than 85°.
Abstract:
A process to form a substantially thick walled hollow bar by hot rolling an elongate member to form an internal hole, whereby the elongate member is formed around the internal hole and the outer edges of the elongate member are brought substantially into contact with each other or into close proximity to each other such that the outer edges form substantially longitudinal contact faces capable of being forced into very close or intimate contact with each other.
Abstract:
An anchor rod having at least one section provided with ribs or other raised portions or profiling and a threaded section at one or both ends, and having a variable transition section between the threaded section(s) and the profiled section; and a method of making the anchor rod.
Abstract:
Round bars are successively rolled through first and second roll passes. Each roll pass is defined by a pair of work rolls having cylindrical rolling surfaces with notches therein extending transversely and obliquely with respect to the rolling line, and with the roll axes defining the second roll pass being offset at 90 with respect to the roll axes defining the first roll pass. The first pair of work rolls is arranged to configure the round bar into an intermediate process section having flat parallel first sides with first ribs protruding therefrom, and the second pair of work rolls is arranged to reconfigure the process section into a finished concrete reinforcing element having flat parallel sides which are perpendicular to the first parallel sides and which have second ribs protruding therefrom.
Abstract:
A fiber for reinforcing concrete comprises a length of metal wire having a substantially straight central part and offset anchoring parts at its opposite ends, each of which includes an initial straight portion parallel to the central part and offset laterally therefrom, a final straight portion coaxial with the central part, and two opposed oblique portions connecting the initial straight portion to the central part and to the final straight portion, respectively.
Abstract:
In a hot-rolled concrete reinforcing bar of which the ribs are arranged along a helical line and form portions of a thread for screwing on an anchoring or connecting body provided with a counter thread a rib form and rib arrangement improved as regards the dynamic stressability of the thread connection is proposed.
Abstract:
Improved metallic rod product which substantially reduces die wear in wire drawing operations, and which provides other advantages during manufacturing. The exterior surface of the rod product is intentionally provided with a predetermined rough texture having certain characteristics, rather than the smooth bright surface conventionally imparted to metallic rod product intended for subsequent drawing into wire. Certain textured surface characteristics of the rod product reduce wear on the first few wire drawing dies by entraining lubricant as the rod moves through the dies, and carry the entrained lubricant into the dies, while at the same time avoiding some common wire drawing defects such as flakes and slivers. The textured-surface rod thus reduces frictional wear of the drawing dies, so that less force is required to draw the rod product through the dies and the useful life of the drawing dies is increased. The desired textured surface of the rod product is preferably provided by hot-rolling with finishing rolls having a roughened surface which is complementary to the desired surface roughness of the rod product; the useful life of such rolls is substantially greater than the life of rolls heretofore used to produce a smooth-finish rod, inasmuch as the textured surface rolls remain usable with a certain amount of wear. The use of complementary textured rolls provides certain texture characteristics not easily produced by any other means.