Continuous rolling process of profile steel for double-rubber ring socket steel ring of prestressed concrete pipe

Abstract

The invention discloses a continuous rolling process of profile steel for a double-rubber ring socket steel ring of a prestressed concrete pipe. According to the continuous rolling process, (1) the cross-section dimension of a steel billet is 150*150 mm, the length is determined according to the length of a cooling bed of an application production line and the width of a heating furnace, and the initial rolling temperature is 1030 to 1080 DEG C; (2) rolling is performed for 11 passes in the whole line, the strong wide pass is adopted for rough rolling of the first three passes, a rolled pieceis rolled into the shape and size required by the next pass in the fourth and fifth passes, the closed pass is adopted for fine rolling, and the size of a groove of a sealing ring and the size of thetotal width of a finished product are guaranteed by using a width limiting principle; (3) the fine rolling is continuous rolling with six racks, wherein K2 adopts a four-roller universal mill, the rest adopts two-roller horizontal mills, and the lateral bending coefficient of the workpiece of each pass is less than plus or minus 0.01; and (4) an inlet guide of each finishing mill adopts a rollingguide with three groups of guide rollers, the first group include horizontal guide rollers, and the latter two groups include vertical guide rollers. According to the continuous rolling process, the problem of lateral bending of the head of socket steel in a rolling process is solved; compared with an open-train mill, the machine-hour capacity level of the steel product rolling mill is increased by one time.

Description

technical field [0001] The invention relates to a continuous rolling process of steel rings for double-rubber ring sockets of prestressed concrete pipes. Background technique [0002] "Section steel for double rubber ring socket steel ring (code named RSSD)" is one of the main structural materials of prestressed steel cylinder concrete pipe (abbreviated as PCCP). It completes the connection of concrete pipe together with socket steel and rubber sealing ring. PCCP is used in urban water supply and drainage main pipes, water transmission and diversion projects, and farmland irrigation. The wide application of PCCP has driven the production of spigot steel and promoted the development of the steel industry in factory pipe networks, power plant supply water pipes and cooling water circulation systems, inverted siphons, pressure tunnel pipelines and deep-covered soil culvert pipes, etc. The production process of the section steel for the steel ring of the double rubber ring sock...

AI Technical Summary

Problems solved by technology

Domestic manufacturer inquiries and on-the-spot investigation results: At present, the manufacturers of hot-rolled socket steel are mainly several section steel manufacturers in Henan, Hebei and Shandong. The production equipment adopts relatively backward transverse rolling mills. The production equipment is simple and backward, and the degree of automation is very low. High labor intensity, low production capacity and high energy consumption

It can be known from the above information that there are only a few profile steel mills in China that can produce it at present. Because of its special-shaped section, the uneven deformation of the section of the rolled piece is large, and the side bending of the rolled piece is serious, it is very difficult to realize rolling production in the continuous rolling mill. Therefore, Domestic section steel mills are all produced on relatively backward tandem rolling mills, but the tandem rolling mills have low production efficiency, low degree of automation, harsh operating environment for on-site personnel, and unstable product quality control, which are the main factors restricting production capacity

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