Common sense of rolling mill workers adjustment (1)

Structure type of guide and guard arrangement

1. The rolling mill is a rolling line with alternately arranged horizontally and vertically. Usually, the inlet guide of a vertical stand rolling mill is a rolling guide, and the exit of the vertical stand and the inlet and outlet guides of the horizontal stand are sliding guides.

2. The rolling mill is a fully horizontally arranged rolling line. The export guide for odd-numbered stands is torsion rolling guide, the imported guide for even-numbered stands is rolling guide, and the imported guide for odd-numbered stands and even-numbered stands. The exit guide guard of the frame is a sliding guide guard.

2. Finished product rolling speed setting depends on factors such as motor power.

3. Roll adjustment device

1. Axial adjustment device: used to adjust the wrong roller.

2. Radial (reduction) adjustment device: adjust roll gap and parallelism

4. Rolling line elevation adjustment Each rolling line has a fixed elevation, which is kept constant during each rolling. When changing rolls, the horizontal rolling mill can adjust the thickness of the backing plate of the lower roll chock to ensure that the standard elevation will not change; the vertical mill rolling line height is based on the standard entrance and exit guide elevations, and is ensured by the vertical adjustment and locking of the hydraulic adjustment mechanism The height of the rolling line requires the entrance and exit guide and guard support, the size and position of the base to ensure that they meet the requirements and guide and guard installation specifications.

Five, guide and guard adjustment

1. Adjustment of the guide and guard when assembling the rolling guide and guard should fully adjust the symmetry of the guide roller when assembling; the torsion guide and guard should correctly adjust the opening and twisting angle during assembly.

2. Adjustment of guide and guard site installation

2.1 When installing the guide and guard, the center line of the imported guide and guard device should be aligned with the center line of the roll pass, and it should be ensured that once the rolled piece bites in, it will be out of contact with the guide plate or pre-guide plate;

2.2 The front end of the exit guide is consistent with the rolling groove. The lower guide plate is slightly lower than the rolling groove according to the specific rolling conditions. The nose end should be as close as possible to the rolling groove, but avoid contact with the roll.

2.3 The guide and guard support should be kept level;

2.4 The guide and guard should be installed firmly on the guide seat

Rolling mill workers adjustment often (2)

Six, tension adjustment

 1. The setting of stacking relationship should generally maintain micro-rolling between racks without loops. However, in order to ensure the stability of the strip in actual production, micro-stack rolling can also be appropriately used when the rolling stability is guaranteed. Rolling. (See Table 1 for stacking coefficients) Table 1: Table of stacking coefficients of each unit, rack steel coefficient%, stacking coefficient%, rough rolling unit 1.5-2, its value ≤ 0.5, middle rolling unit 0.5-1.5, its value ≤ O. 3 Finishing mill

2. The purpose of tension adjustment: To achieve the consistency of the head, middle and tail dimensions, which is conducive to the quality control of the finished product; to achieve stable rolling and establish a stable rolling dynamic balance.

Seven, rolling mill adjustment

1. Correctly control the opening-rolling temperature, and the billet that does not meet the temperature specification shall not be rolled. Generally, the slab temperature drop during rolling is not large in the continuous rolling system, so as long as the starting rolling temperature is correct, the final rolling temperature can be guaranteed.

2. Blackhead steel, elbow steel and rolling heads are not allowed to be rolled when there are obvious defects in the head of the rolled steel and they are not eliminated. 3. Ensure sufficient cooling water and proper cooling position.

4. The rolling mill system (stand, bearing and main motor status) and auxiliary devices (guide and guard support, guide guard, guide groove, looper) should always be handled under close monitoring.

5. Regularly check the shape and size of each pass, adjust the size of the red billet so that each pass is in a good process state, and control the key pass bar shape to ensure that the finished product meets the standard requirements.

Common sense of rolling mill workers adjustment (3)

8. Finished product inspection and internal control standards for the size of ribbed steel bars of various specifications

1. The inspection and judgment of each item of the finished product shall comply with the requirements of the standard "Hot Rolled Ribbed Steel Bar for Reinforced Concrete".

2. The thermal inspector is responsible for inspecting the size and surface quality of the finished product in accordance with the requirements of the internal control standard, judging qualified and unqualified products, distinguishing furnace batch numbers and guiding production control.

3. Organize negative deviation production and perform actual weight weighing of finished products to ensure that the actual weight of the product does not exceed the minimum value specified by the standard. Table: Deviation of actual weight and theoretical weight of ribbed steel bars of various specifications Nominal diameter Deviation of actual weight and theoretical weight% 10-12 ±7 14-20 ±5 22-50 ±4

4. For the batch number of the furnace, take two samples for mechanical and bending tests, and indicate the batch number of the furnace. After air cooling, the cold inspector will send it to the test room for testing.

5. Qualified products and unqualified products are stacked separately and clearly marked, and each batch number of qualified products should be clearly marked. Mixed batches are strictly prohibited.