There are many types of spindles used in industrial applications. Rolling mill spindles are used to transfer the power from a gearbox or pinion stand to a set of mill rolls when a direct connection is not feasible or practical. Spindles are chosen based on their particular application for torque and speed. Most smaller diameter spindles are made from 4140 grade high strength steel bar while many larger diameter spindles used in a rolling mill application are forged steel. While most spindles are fitted with replaceable coupling ends, spade type spindles and jackshafts are forged steel. Spade type couplings are also referred to as universal spindle couplings and were very common. The majority of mills today use cardan type spindle which use a universal style coupling on the shaft ends.
UNIVERSAL SPINDLESField of application: Main drive lines of hot and cold rolling mills.
Designation: Torque transmission from electric motor to rolling mill stand work rolls.
Design distinguishing features: Hinges and spindles are equipped with bronze plain bearing liners (plain plates) enabling spindle operation angles of 8°. Load-bearing parts of spindles are made of high-grade alloyed structural steel by forging with further heat-treatment and machining.
CARDAN SPINDLESField of application: Main drive lines of cold and hot rolling mills, billet and tube mills, work stands, paper- making equipment, various test benches, special drives etc.
Designation: Torque transmission from electric motor or speed reducer to roll mill stands work rolls and other operating mechanisms.
Design distinguishing features: Spindle hinges are equipped with bearings on rolling elements. They enable spindle to operate with angles of inclination of up to 30°.
GEAR-TYPE SPINDLESField of application: Main drive lines of rolling mills and other devices.
Designation: Torque transmission from pinion stand speed reducer to operating mechanisms.
Design distinguishing features: Provide torque transmission when shafts are not coaxial to executing mechanism. Possibility to work with angles of obliquity in the hinge of up to 3°. The hinge consists of toothed assembly and teeth bushing with involute barrel tooth. Strength parts of the spindle are made of alloyed high-strength structural steel by forging with further heat treatment (nitride hardening, cementation, induction hardening) and machining.