Tandem Cold Mill Research and Development Trend

Tandem cold mill is one of the most complicated, the highest automation level and accuracy equipments in Metallurgical Industry control system. It represents steel and iron industry technology development level in some extent.

CFHI and Anshan steel group jointly developed the 1780mm wide strip cold tandem mill line which is independently designed and manufactured by CFHI is the first independently designed and researched large cold tandem mill unit of independent knowledge property rights in our country. Recently, it is awarded first prize of National Science and Technology Progress.

This 1780 cold mill is the key equipment in steel enterprise to manufacture the steel plate for automobile and special shipbuilding and only German, Japan and other minority countries can make it at present. This equipment consists of five mills and 10 stands. Its total weight is 4146 tons, design rolling force is 2500 tons, maximum rolling speed is 1350m/s, and 0.

2mm ultra thin strip can be rolled steadily under high speed rolling condition. After this mill unit putting on production, Anshan steel group s annual growth has reached 600 million yuan and realized profit and tax 60 million yuan. During design and manufacture, this mill unit is adopted many world leading techniques and innovative technology as well as advanced process.

In order to enhance products thickness accuracy, besides traditional AGC control, modern cold tandem mill provided laser velocimeter, inter-stand thickness gauge and other detecting instruments. Laser velocimeter measured strip s speed directly, its measuring accuracy may achieve 0.05%, the laser velometer coordinates the AGC control technology can enhance export strips thickness control accuracy which guarantee value can reach 0.

8%. Using rolling bearing of back-up roll with high response speed AC speed regulation and matched high accuracy rolling skill, can realize high speed rolling technology which abroad has reached 2800mmin.