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Roller lathe is a special roller processing machine tool. The roller is usually used for the upper part of the rolling mill. The roller is an important part of the rolling mill. It uses the pressure produced by a pair or group of rollers to roll steel. The roller is the equipment that makes the metal material produce plastic deformation. It is the main consumption part to determine the working efficiency of the rolling mill and the quality of the rolling steel.
There are many kinds of roll shapes. The common raw materials of roll shapes include cast steel roll, pig iron roll and forged steel roll. The above two types of rolls are cast steel rolls, both of which are forged rolls.
At present, in order to improve the production efficiency and reduce the consumption of rolls, roll manufacturers often choose high toughness rolls. It is also because of the increase in hardness that it is very difficult for the mechanical factory to process rolls. The hardness of the working layer of the roller itself is very high. In addition, there are sand grains, pores and other problems on the surface of the roller of large castings, which make the processing more difficult. The raw material of the roller selected must be the raw material of the roller with good wear resistance and strong toughness, so as to effectively improve the production efficiency and save costs.
So it is also important to select the tool.
When machining high toughness rolls, cemented carbide tools are used first, and are most widely used in tool materials. However, its own hardness is not high, so it can only process rollers below HRC45. Such as common hot rolling rolls, backup rolls, intermediate rolls, ductile iron rolls, high alloy rolls, etc.
The second feature is that it is an efficient material for turning and adding roll cutters, which has excellent wear resistance and impact toughness. In the process of turning and adding roll production, not only will not have severe wear, but also will not have the problem of knife breakage. Its service life is more than ten times that of cemented carbide tools.
The latter is the ceramic tool. Although its hardness is higher than that of the hard metal tool, it is only suitable for the finishing process because of its brittleness, and is not suitable for the rough turning roll, which is easy to collapse.
The rolls mentioned above are divided into three categories according to raw materials: steel castings, rolls and forged steel. In fact, each raw material has its own manufacturing process. Let's see what it is?
Hot roll rolling process: smelting, forging, softening treatment, preliminary processing, thickening (improving hardness), finishing, flaw detection, and finished product inspection.
Manufacturing process of steel casting roll: take alloy steel casting roll as an example: smelting, forging, preliminary processing, polishing, finishing, performance testing, flaw detection, etc.
The manufacturing process of forged steel roll: material selection, EBT primary refining, LF refining, vacuum degassing, casting molding, electroslag remelting, forging, spheroidizing annealing, primary processing, quenching and tempering (quenching+high temperature tempering), semi-finishing, flaw detection, preheating treatment, dual-frequency quenching, cold treatment, low temperature tempering, finishing, hardness, ultrasonic and metallographic packaging.
