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Cold Rolling Mill Function Perfect, Stable, Festival
- Jul 03, 2017 -

1. The deformation characteristics of stainless steel

The first feature of stainless steel is the deformation resistance is large, generally twice as high as ordinary carbon steel; due to cold processing process, will produce deformation of martensite, so the processing hardening rate, the need for greater rolling capacity and load. Stainless steel thermal conductivity is poor, therefore, the need for rolling mill has a stronger cooling capacity, precision and plate requirements, high surface quality requirements.

Stainless steel Cold Rolling Mill must be high efficiency, high precision, it is the most prominent Cold Rolling Mill requirements:

(1) can produce wide and thin strip products, and require less rolling times, rolling time is short;

(2) the total reduction rate, especially the first reduction rate to be large, as far as possible to achieve a rolling, without intermediate annealing;

(3) to ensure product size accuracy, good plate and surface quality.

Second, the basic requirements of Cold Rolling Mill

The specific requirements of the Cold Rolling Mill, roughly summarized as the following:

(1) the work roll should be as small as possible;

(2) mill rigidity, including horizontal and vertical stiffness;

(3) roller work stability is good;

(4) symmetrical on both sides of reversible rolling;

(5) large tension, and have good tension and speed control;

(6) good process lubrication and cooling system;

(7) good roll gap adjustment and reaction speed;

(8) good on-line convexity adjustment and reaction speed;

(9) fully functional AGC, AFC control system;

(10) drive system control function perfect, stable, energy saving;

(11) simple structure, easy to maintain.

According to these requirements, stainless steel Cold Rolling Mill are used multi-roll mill. In the 20th century, 60 years ago, most of the four-roll reversing mill, but because of its work roll, support roll is large, the rack is also very large, poor stiffness, difficult to achieve high efficiency, high precision rolling, so now is not And then some of the four-roll mill has been built for the Z-type rolling mill (six or eight rolls), is still in use a small number of four-roll reversing mill, generally used for narrow strip production or multi-roll mill For the middle blank.

The equipment associated with the wear of the rolling mill is: steel roll width, caliper device, steel trolley stroke control device, CPC strip centering control system, pinch roller and straight head machine, and 3 sets of center guide device The

1. Steel measuring width, diameter measuring device

The laser measuring device is installed on the steel structure bracket, which transmits the measured coil diameter and width signal to the computer to output the target stroke data instruction to the steel trolley to ensure the winding accuracy of the trolley.

2. Steel car travel control device

The trolley is used to control the rotation of the trolley, which is coaxially mounted on the wheel axle of the trolley wheel. The encoder converts the detected number of revolutions of the wheel into a feedback signal to the control unit and the set target stroke To determine the stop position of the trolley to ensure that the coil is placed in the correct position coinciding with the center line of the mill when the coil is loaded onto the unwinder.

3. Strip Control System

When the mill is worn, the displacement of the uncoiler is dynamically controlled so that the strip is always running on the center line of the mill. The CPC control system is composed of three parts: the detection unit, the signal control unit and the hydraulic servo unit. The detection unit comprises a position sensor, a position sensor positioning device and a high frequency light source. The hydraulic servo unit comprises a hydraulic station, a servo valve, a servo cylinder and a position sensor. The sensing unit is mounted on a steel structure bracket on the strip and has a position sensor (LS13 / LS14) on each side. Each position sensor includes a measuring receiver LS13 and a reference position receiver LS14, LS13 / LS14 on both sides Mounted on the same chute, driven by motor belt, moved in or out simultaneously. Before the start of the strip, the edge of the strip is detected by the motor-driven sensor positioning device. LS13 and LS14 each of the high-frequency light receiving cylinder and high-frequency light source of the same point of light. When the aperture of the measuring receiver LS13 is covered by the steel strip halfway, the reference position receiver LS14 high frequency light receiving the channel is not affected by the strip position when the strip is centered on the centerline of the mill. When the strip is deviated from the center position, the contrast signal generated on the measuring receiver is transmitted to the signal control device. After the signal control device processes the signal, the hydraulic servo system is controlled to drive the uncoiler to keep the strip in the middle position.