In order to adapt the demand of the market for bars, The Special Steel Plant of Laigang produces Φ140 and Φ150mm20CrMnTiH bars successfully through optimizing the production process of theΦ650mm×1/Φ550mm×1/Φ550mm×4 semi-continuous rolling mill, the pass sequence and guide fittings.

The original guide fittings,which fixedly combined with the rolling mill,because of long drive chain and many fixed points,usually become flexible and seizing,bring on rolling accident.

In order to quick change guide fittings,an unit with double swallow tailed grooves was developed It has many advantages,such as simple structure,easy operation,quick changing,good safety,etc The time of changing guard reduced less than 15s from 4～5mi

Analysis of failure of guiding equipment for finishing rolling mill;

The function of adjust system for guiding equipment was analyzed.

Design of guide and guard for round bar slitting rolling;

Reformation of guide and guard of finisher of high speed wirerod mill;

The service life of inserts of guide and guard in the delivery end of pinch roll of laying head was studied.

Design principle of guide device for high speed wile lolling mill are introduced, also construction of different types at inlet and outlet part, material, design method, and fixing way with underbed in DANIELI rough, intermediate and flushing high speed wire rolling mill are described.

In order to improve the condition of guide device of 3 500 mm finish mill and reduce the failure rate,a series measures were adopted: ameliorating hanging position of the guard plate,optimizing occlusal surface parameter of the uide wien guard tlate,altering guard plate location mode when changing roll,redesigning the bottom of guard sheet.