Unlocking the twin module mill: an efficiency revolution in metallurgy
Date: 2025/4/30
Category: Metallurgical encyclopedia terms
Views: 55
Twin module block (TMB) is an advanced equipment widely used in the steel rolling field, the following is the introduction:
Structure characteristics:
The TMB twin module rolling system consists of an 8-pass DWB pre-finishing mill train and a 4-pass TMB twin-module mill train (in a 2+2 configuration, each rack is individually driven by a motor), enabling ultra-high speed finishing of all specifications. The 4-pass TMB twin module rolling mill train with automatic quick-change equipment (the whole change process takes only about 5 minutes) can be used as a finishing mill to produce virtually all specifications of wire rod.
Technical advantages
The upstream mill of the twin module rolling system uses a single pass system to cover the entire production range. There are many benefits to mill operation, increased equipment efficiency, easy programming and minimization of mill/guide equipment spare parts inventory, but also simplify production management in rolls workshop. In addition, the metal yield rate is also greatly improved, which can reach more than 97% (or even up to 99% if used in conjunction with the EWR® headless welding process). This is mainly because the cooling water in the water cooling line, which is arranged between the DWB pre-finishing mill train and the TMB twin module rolling unit, is kept normally open to cool the whole length of the rolled piece and avoid the phenomenon that the rolled piece head is not cooled (while in the traditional wire rod production line, this section of wire rod needs to be cut off).
In addition, this arrangement can also achieve smooth, stable and trouble-free conveying of rolled pieces. Because large specification rolled pieces can pass through the water cooling line at a lower speed before entering the 4-pass TMB twin module finishing mill train, higher production efficiency can be achieved.
The innovative concept of the TMB system, combined with the micro-tension control system between the TMB twin module block unit and the upstream DWB pre-finishing mill train, enables the high speed production of small specifications (up to a minimum diameter of 4.5mm) while meeting extremely tight dimensional tolerances.
Optimized mechanical design and equipment structure, simple drive system, minimize maintenance workload and spare parts requirements. TMB twin module rolling unit is designed to realize low temperature rolling according to the needs of steel grade that needs to be rolled. All of these make the twin module rolling unit one of the most important innovative technologies in the field of wire rod production.
Working principle
Rolling process pass: elliptic-round-elliptic-round or elliptic-round-round-round rolling process pass is often used. When the rolled pieces pass through different shapes of pass, the precise control of size and shape is gradually realized to obtain high-precision finished products.
Roll gap adjustment: The use of eccentric sleeve to adjust roll gap. Driven by the roll gap adjusting mechanism, the eccentric sleeve can rotate a certain Angle in the roller box, so as to change the center distance of the gear roller and achieve the purpose of adjusting the roll gap.
Roller ring locking: the locking of the roller ring adopts the locking method of friction clamping force, which is mainly composed of locking nut, conical copper sleeve, adjustment pad, pressure plate, and compression spring. The roller ring locking nut is loosened or tightened by hydraulic special tools to transfer a certain clamping force to the roller ring and play a frictional locking role.
Application
The twin module rolling mill is widely used in the production of high speed wire rod and rebar. It can produce wire rod products ranging from Φ4.6mm to 25mm, covering carbon structural steel, welding steel, cold heading steel, high-quality carbon structural steel, alloy structural steel, spring steel, bearing steel and other types of steel.
