Processing technology of npr steel bar circle

Abstract

The invention discloses a processing technology for NPR steel bar circles. The NPR steel bar is cold-worked and has a diameter of less than 14 mm. The NPR steel bar has a yield strength of 800MPa-950MPa, a tensile strength of 900MPa-1100MPa, and a maximum force elongation of ≥20 %; The steps of the processing technology include: one-character discharging process L20; uncoiling process L30; leveling process L40; tipping process L50; butt welding process L60; Sand process L90; in-situ online annealing process L10; air-cooled buffer process L11; closing circle process L12; feeding process L13; leveling process L14; The processing technology of the NPR steel bar circle of the present invention can realize the intelligentization of the whole process, meet the processing requirements of the NPR steel bar circle, and meet the fully automatic and intelligent production requirements of the NPR steel bar, NPR cold-rolled spiral steel bar, and NPR prestressed steel bar.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a processing technology for round NPR steel bars. Background technique [0002] In the existing technology, the new NPR material overcomes the local deformation and fracture of ordinary threaded steel and prestressed steel bars, and realizes high strength and high toughness, with a yield strength of up to 900MPa and a maximum elongation of more than 20%; fully automatic intelligent NPR cold Rolled (cold-drawn) steel bar round production line is mainly used for cold processing of new NPR materials. The main products are NPR steel bars with a diameter of less than 14mm, NPR cold-rolled spiral steel bars, and NPR prestressed steel bars. [0003] Fully automatic and intelligent NPR cold-rolled (cold-drawn) steel bar round production through end-to-end welding, steel bar rust removal, steel wire wheel or shot blasting sandblasting, decoiling, leveling, point rolling or hydrau...

AI Technical Summary

Problems solved by technology

[0006] 1) The existing scale cleaning process adopts pickling and phosphating, which cannot meet the national environmental protection requirements, and cannot complete online digital production

[0007] 2) The existing gun-type uncoiling rack can only be used for the application of low-carbon and small-diameter steel bars, and cannot be used for high-carbon steel bars or large-diameter high-carbon steel bars, especially NPR steel bars that produce resistance due to external forces. Application, disc-type unwinding rack, cannot be used for unwinding of high-strength steel bars

a) Unable to achieve continuous production without stopping, b) Unable to meet the setting-out requirements of high-strength steel bars

[0008] 3) The existing steel bar welding machine can only weld low-carbon or ordinary high-carbon steel wire welding requirements

a) It cannot meet the welding requirements of large-diameter, high-strength and austenitic steel bars; b) It cannot complete the automatic deburring function; c) It cannot complete the digital operation

[0009] 4) The existing steel bars are pierced by pointing or sharpening, which results in high labor intensity for workers and safety hazards in the operation process. The length of the steel bar rolling head is too long. Do waste treatment, resulting in a great waste of raw materials

[0010] 5) The current technology adopts drawing dies for diameter reduction forming. During the processing of high-strength steel wire or austenitic steel bars, the service life of the drawing dies is very short. The service life of the dies is only 2-3 tons. About 60% of the cost, the mold needs to be replaced. When changing the mold, the labor intensity of the workers is high, time-consuming and labor-intensive, and the repeated threading causes a great waste of raw materials for the steel bar. It needs to be lubricated with grease, which increases the processing cost of the steel bar.

[0011] 6) The existing ordinary steel bar cold processing production line cannot complete automated production and remote monitoring. The steel bars produced cannot be tracked and traced, and it is impossible to achieve intelligent monitoring from raw materials to processing to intelligent storage.

[0012] To sum up, the existing ordinary steel cold processing production line and processing technology cannot meet the fully automatic and intelligent production requirements of NPR steel bars, NPR cold-rolled spiral steel bars, and NPR prestressed steel bars.

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