The following pages are articles that various people at Sendzimir have written over the years. Please browse at will to discover stimulating ideas and fodder for future thought. You may find here that science fiction has become science fact!
Michael G. Sendzimir was born in Shanghai, China, in 1924. He received his early schooling in Poland and continued his education at La Chataigneraie in Switzerland. He graduated in 1943 from the Manlius School, near Syracuse, New York, after which he served three years in the Army of the United States, rising to the rank of Second Lieutenant. In 1951, he graduated from Columbia School of Engineering in New York with a BS degree in Industrial Engineering. In 1986, he received his Honorary PhD in Science, and in 1993 in Law.
The concept of using a live reduction mill in a stainless annealing and pickling line was developed in the early 1980s. The objective was to take a live pass on annealed and pickled material to develop the surface in order to see if such a coil of strip could be directly cold rolled instead of having to be processed through a surface grinding line. Also to be investigated were the extent to which gauge could be corrected and reduction achieved. 4-High mills and Sendzimir ZS-type mills averaged reductions of 7-8%. However, they had difficult with shape control, and the material underwent work hardening.
A new continuous annealing, pickling, and rolling line just 380 m long that reduces production time from 3 weeks to 20 minutes has been commissioned at Isbergues. The LC2i (Ligne Continue Intégrée Inox) continuous pickling and rolling line for stainless steel was commissioned at Usinor’s Ugine Isbergues works in the north of France in October 1998.
THE problem of control of strip flatness in cold rolling has challenged the industry for a long time. The problem can be separated into two parts: measurement of flatness; and adjustment of roll gap profile to correct any deviation from the target detected by the measuring device.
The flatness measurement problem has largely been solved, and several flatness measuring devices (shapemeters) are now available. These devices all have their limitations, eg, high cost, some are suitable for low tensions only, and frequent discrepancies may be found between their indicated flatness values and actual flatness (as measured subsequently on the strip). However, in general, for a given application, it is possible to obtain a
shapemeter that will perform satisfactorily
Mitsubishi Shindoh, a Japanese copper sheet and strip producer, has been operating since 2000 a 26-in. wide Sendzimir Z-mill with a pre-stressed split housing supplied by Sendzimir Japan, Ltd. The mill includes Sendzimir’s patented Flexible Shaft Backing Assemblies for improved control of strip shape and is rolling copper and copper alloys.
The first cluster mills with small-diameter work rolls came on the market in the early 1930s. They were initially used to roll low-carbon steel and very special materials in narrow widths. It
was only in 1950 that the industry fully recognized the suitability of the Sendzimir cluster mill for rolling stainless steel.
Nisshin Steel Co. placed the world’s first Sendzimir tandem mill into operation at its Shunan works in 1969. Located in Nanyo, Japan, the plant occupies a site of approximately one-third square mile. Occupying about 18 percent of the 315-ft total installation length are four Sendzimir stands: one ZR 22N-50 and three ZR 21B-50. Once up and running, the mill’s maximum finished monthly production capacity totaled 18,300 net tons — 35 percent 400 series; 65 percent 300 series stainless steel.
While it is true that Shapemeter technology is well developed, and operators of cold strip mills have considerable choice regarding shapemeters on the market, the fact remains that, for the
most part, available shapemeters are far too expensive for cold mill operators to afford. A survey of rolling mills currently operating in the world will reveal that the vast majority of mills less
than 1 meter wide do not have shapemeters installed.