one. Hot rolling process road:
Tube blank preparation - annular furnace - perforation - continuous rolling - rapid reheating furnace - sheet reduction - cooling bed
two. Ring furnace:
Baking temperature 1290℃
three. perforation:
1. Capillary standard: 222X13mm
2. Capillary sampling: outer diameter 220～222mm
Outer diameter 14～15mm
3. Equipment preparatory work: 1. Check the hexagon in the base of the guide plate (replace the hexagonal sleeve in the right guide plate)
2. Replace and tighten the guide plate bolts and base bolts
3. The perforated roller is a new roller (roller diameter 1030mm)
4. Rolling parameters:
1. Roller speed and guide plate speed are low for rolling, and the exit speed is 0.8m/s
2. The roll distance of the new roller is larger than the design (the lead distance and the amount of the top front are consistent with the design)
Four. Continuous rolling:
1. Continuous rolls: replace new rolls during maintenance.
The 4th and 5th frames of the original continuous rolling (4B, 5B) rolled 1550 pieces, which were not replaced after the original maintenance. However, after installation, a red alarm will appear during the pressing process. After the processing is normal, the roll gap is investigated on site. It can be clearly seen that the roll gap between the fifth frame R3 and R1 and R2 is larger than the roll gap between R1 and R2. Press down the cylinder to return to zero several times for its effect. After the 4 and 5 frames were replaced with new rolls, the roll gap was not abnormal after the rolls were pressed to work.
5B to the east and west to zero the frame alignment, no abnormality was found, and the CHOCK value of each roller was increased by about 0.05mm.
2. Offline machine:
During maintenance, replace the cylinder liner of the lower roller R1 of the 3rd frame and adjust it to zero. Replace a new set of de-piping machines (1B, 2C, 3B), and measure the roll gap adjustment.
five. Reheat furnace:
The furnace temperature is 960±10℃. Press the walking beam before production and grind the bypass roller table.
six. Zhang minus:
Grind the steel structure during maintenance.