- Apr 01, 2017 -
A, the classification of the roll is how?
Roll is made (rolling) produce plastic deformation of metal tools, is important in determining the quality of efficiency and rolling mill consumption parts.Roll is one of the important parts on the rolling mill rolling mills, the use of a pair or a group of roll rolling pressure generated by rolling grinding steel.It mainly bear the movement when the rolling load, the influence of wear and temperature changes.
Roll a lot of more phyletic, the commonly used steel roll roll material classification, cast iron roll and roll forging three.The cast iron roll and cast iron roll all belong to the casting roll, is casting molding, only the casting material different.
The casting roll: refers to the steel smelting or melting molten iron directly pouring manufacturing kinds of roll forming a production mode.
Forging roll: is a kind of pressure of forging machinery for metal blank, make its produce plastic deformation in order to obtain certain mechanical properties, a certain shape and size of roll forging processing method.
Second, the roll is used for what machine?
Roll according to the different hardness of roll, the situation is different: (1) roll roll hardness about HRC30-40, is used to open the machine, large steel mill of roughing mill, etc.(2) roll roll hardness about HRC60-85, used for thin plate, medium plate, medium shape and small section steel mill of the roughing mill and four supporting roller of roller mill;(3) roll roll hardness about HRC85-100, used for cold rolling mill.
Three, all kinds of materials processing technology of roll?
(1) iron roll processing: smelting, casting, softening treatment, rough machining, heat treatment (increase hardness), finishing, inspection, inspection, finished product.
(2) the processing technology of the cast steel roll: alloy cast iron roll, for example: smelting, casting, rough machining, heat treatment, finishing, performance, flaw detection, etc, finished product.
(3) the processing technology of the forged steel roll: cold rolled work roll, for example: the selection of raw materials - at the beginning of EBT - LF refining smelting - vacuum degassing to casting, electroslag remelting to forging to spheroidizing annealing, rough machining, tempering, quenching and high temperature tempering to semi-finishing, flaw detection to preheat treatment, double-frequency quenching to cold treatment, low temperature tempering to finish machining, hardness, metallographic and packaging factory.
Four, the processing roll often appear problem?At present, the roll for rolling mill work efficiency and reduce roll consumption, with high hardness of roll, it is because of the increase in the hardness of roll bring difficulty to processing roll machine factory.Large enterprises adopt high hardness of roll on CNC machining, but small businesses still using common roll lathe processing, processing process, the machine tool vibration causes of turning difficulties and problems such as surface finish is not good, affect the machining efficiency and machining quality.