Processing technology of npr steel bars

Abstract

The invention discloses a processing technology of NPR steel bars. The NPR steel bars are cold-worked, and the NPR steel bars have a yield strength of 800MPa-950MPa, a tensile strength of 900MPa-1100MPa, and a maximum force elongation of ≥10-40%. The steps of the processing technology include: one-character discharging process L20: uncoiling process L30: leveling process L40; butt welding process L50; sandblasting process L60; straightening process L70; Screw drawing process L10; straight-forward continuous wire drawing process L11; pre-straightening process L12; fine straightening process L13; cutting process L14. The invention discloses a processing technology of NPR steel bars, which can meet the fully automatic and intelligent production requirements of NPR steel bars, NPR cold-rolled spiral steel bars, and NPR prestressed steel bars.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a processing technology of 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 achieves both 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 cooling Rolled (cold-drawn) steel bar production line is mainly used for cold processing of new NPR materials. The main products are NPR steel bars, NPR cold-rolled spiral steel bars, and NPR prestressed steel bars. [0003] Fully automatic and intelligent NPR cold-rolled (cold-drawn) steel bar production through end-to-end welding, steel bar rust removal, steel wire wheel or shot blasting sand blasting, uncoiling, pay-off, leveling, pointing or hydraulic pusher, cold-rolled screw machine O...

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 the use of 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, can not be used for unwinding of high-strength steel bars or large-diameter steel bars

a) Unable to achieve continuous production without stopping, b) Unable to meet the setting-out requirements of high-strength steel bars and large-diameter 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, resulting in high labor intensity for workers, and there are safety hazards in the operation process. Do waste treatment, resulting in a great waste of raw materials

[0010] 5) The existing 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, and 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 wire 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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