STALMA S.A. - STILL WITH YOU

Drawing is a process of cold metal forming, in which the processed material moves through a suitably shaped hole that is a special tool called a drawing die. The aim of drawing is obtaining products in the form of bars or wire with very precise cross-sectional dimen - sions, smooth, bright surface and specific mechanical properties. As a result of the drawing process material is strengthened which means increase in strength proper - ties and decrease in plastic properties.

The process is performed on a special machine – peeling line. Rotating head equipped with knives of carbide blades ensures the removal of surface layer with com - mon metallurgical defects. As a result of peeling one obtains a product with flawless surface and with high accuracy of diameter - class IT9.Mechanical properties do not change during peeling.

Grinding is a precise reduction machining done with the use of griding wheels on special machines that is centreless grinders. Ground bars are characterized by the highest quality among bright steel products and find the application in the production of the most responsible parts of the machinery. Ground bars can be processed from both half-products, drawn or peeled bars. Mechanical properties do not change during grinding.

An innovative technological process carried out on specialized machines allowed for the extension of the current offer with products exceeding the requirements of the applicable European standards. The innovative production of the bars allows cost reduction of further processing, thanks to the increased geometric accuracy and ready-to-use surface. Modern production and control methods allow achieving significantly higher product characteristics: Surface quality – up to class 4 Cross-sectional dimension of a bar within the assumed tolerance – along its entire length Roundness deviation – max level 0.0261 (IT / 3) Precise length – tolerance up to 5 mm Straightness of bars – up to 0.3 mm / m No surface decarburization