Finishing monoblock with optimized transmission ratio for a billet rolling plant

Abstract

A finishing monoblock with optimised transmission ratio for a billet rolling plant comprises a plurality of rolling stands (Gl-Gn) arranged in sequence suitable for forming a rolling line and actuatedby a pair of mechanical transmissions (11, 12) in which bevel gear pairs are foreseen for the variation of ratio in the stands of the rotation speed of rolling cylinders (18). According to the invention, such a variation of the ratio in the stands is carried out through the combination of a first type (A, B) of bevel gear pairs with a second type of bevel gear pairs (C, D) and there is a set of four of cylindrical gears suitable for making four stands (C, D) with the same transmission bevel gear pair.

Description

technical field [0001] The invention relates to a finishing integral unit with an optimized transmission ratio for billet rolling plants. Background technique [0002] In rolling equipment or rolling mills for billets according to the prior art, the billet is preheated to a temperature exceeding 1000° C. and then subjected to rolling in order to gradually reduce its section to a desired size. [0003] High mechanical properties, elastic limit and deformation during drawing are particularly important parameters in the manufacture of high-quality and special steel wire rods. [0004] Thus, in a rolling mill, one of the key parts that constitutes an integral unit for finishing consists in reducing the size of the billet through a number of rolling stands in order to manufacture the material to be sent to the sizing mill or directly to the laying head. wire. [0005] In order for the wire to have a circular cross-section or a substantially regular profile, the rolling rings or...

AI Technical Summary

Problems solved by technology

[0013] These situations require large expensive bevel gear pairs, which are given very high gear ratios, causing very large reactions on the bearings, which means that very large bearings must be selected to support the load

[0014] However, large bearings have speed limitations

[0015] Optionally, small bearings can be used to withstand high speeds, but they have the disadvantage of short life and therefore require frequent maintenance

[0016] The variation of transmission ratios achieved by the above-mentioned bevel gear pairs creates the need that the bevel gear pairs for each pair of rolling stands have a specified transmission ratio, and thus the cost of spare parts is high, and other components of the rolling stands Requires finishing machining, resulting in high manufacturing costs and high inventory costs for spare parts

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