Machining process of NPR steel bar wire rod

Abstract

The invention discloses a machining process of an NPR steel bar wire rod. An NPR steel bar is in a cold machining state, the diameter of the NPR steel bar is smaller than 14 mm, the yield strength ofthe NPR steel bar is 800 MPa to 950 MPa, the tensile strength is 900 MPa to 1100 MPa, and the maximum force elongation rate is larger than or equal to 20%. The machining process comprises the following steps of a linear emptying process L20; an uncoiling process L30; a leveling process L40; a pointing process L50; a butt welding process L60; a hydraulic head pushing process L70; a cold drawing smooth surface process L80; a sand blasting process L90; an in-situ online annealing process L10; an air cooling buffer process L11; a coiling process L12; an emptying process L13; a leveling process L14; a cold drawing spiral process L15; a straightening process L16; and a coiling process L17. According to the machining process of the NPR steel bar wire rod, the whole-process intellectualization canbe achieved, the machining requirement of the NPR steel bar wire rod is met, and the full-automatic intellectualized production requirement of the NPR steel bars, the NPR cold-rolled spiral steel bars and the NPR prestressed steel bars is met.

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 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 round production line is mainly used for cold processing of new NPR materials. The products are mainly NPR steel bars with a diameter of less than 14 mm, 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 sand blasting, decoiling, leveling, point rolli...

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, cannot be used for unwinding of high-strength steel bars

a) It cannot achieve continuous production without stopping, b) It cannot meet the requirements for setting out 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, 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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