November 01, 2018

Science and technology: The improvement of roller mills

By Wu Wenbin, Henan University of Technology, China

Rollers are the key components of roller mills. The manufacturing quality and precision of the rollers decides the flour quality and, therefore, the success of the mill as a whole.

China's roll production, after half a century of development, and the efforts of several generations, is constantly improving in terms of technical level and equipment. Successively the chill cast iron, the centrifugal casting process to produce high quality roll, has been upgraded repeatedly. Especially, since the turn of the new century, the main production factory has switched to electric furnaces and improved formulae, rapidly improving the quality of products.
 


The product technical performance of wear resistance and hardness uniformity has received universal enhancement, the roll surface hardness in the 68 o ~ 74 o, whilst the depth of the roll martensite layer is between 8-13 percent (20 mm or so) of diameter.

The roll surface, after polishing, is grooved into tooth rolls. The roll surface after polishing and sand blasting is not a smooth surface anymore, therefore treatment is needed so that surface roughness stays around approximately 2.8- 5.0 o below. Because domestic rollers have proven excellent performance, they have not only completely replaced imported products, to meet the domestic demand, but have also been so successful that batches have been exported abroad.

Taixing Xiqia roll factory, founded in 1995, is the producer of flour mill rollers, feed roller precision parts, grease rolls and are proven malt crushing roller professional manufacturers. The formulation, production technology and technical performance of the product, in strict accordance with the national standard production manufacture and testing standards, uses double metal rollers with centrifugal casting cast iron. The high strength rollers have no surface defects and greatly improve the quality of the castings and yield.

The outer layer of the cast iron roll is abrasion-resistant chilled alloy cast iron, with an inner lining for superior comprehensive mechanical properties of gray iron. The base has nickel chromium alloy cast iron with added elements vanadium, and titanium, with the benefit of increased wear resistance.


Read the full article in Milling and Grain magazine online, HERE.
 

The Global Miller
This blog is maintained by The Global Miller staff and is supported by the magazine Milling and Grain
which is published by Perendale Publishers Limited.


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