Φ460mm PQF連軋管機軋輥黏鋼原因分析

Investigation of Roll Steel-sticking of Φ460 mm PQF Pipe Mill

摘要: 分析了連軋輥表面黏鋼的原因及影響因素，提出了解決方法：改造冷卻軋輥表面的水嘴，同時提高冷卻水系統(tǒng)的壓力，保證水嘴出口水的壓力和流量不變；新連軋輥上線時先安排一定數(shù)量軋制負荷低的產(chǎn)品生產(chǎn)；合理分配各機架延伸率的同時，適當降低第3機架槽底的受力。試驗結果表明：這些方法能有效地降低黏鋼，使產(chǎn)品的一次合格率提高到97.65%，生產(chǎn)停機時間降到2.5%以下。

Abstract: Investigated are the causes for and the elements affecting occurrence of roll steel-sticking of the mandrel pipe mill. Accordingly，a solution is proposed，involving such measures as modification of the water nozzle for roll surface cooling and increasing the pressure of the cooling water supply system so as to get consistent pressure and flow rate of the water nozzle；in case of using new rolls，firstly producing limited quantity of pipes as rolled with rather low rolling load；and properly distributing the elongation rate to each individual roll stand，and appropriately reducing the load upon the slot bottom of stand No.3. The testing operation result demonstrates that thanks to the above mentioned measures as taken， the roll steel-sticking severity is remarkably abated， and thus the first pass yield （FPY） goes up to 97.65%，while the downtime of the mill is cut down to 2.5%.