Autonomous overhaul B-B Gaussian web offset press experience
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The newspaper rotary offset printing machine has the characteristics of high speed and large impact. In recent years, many unit printing equipments have gradually deteriorated, and inevitably, the wear of the drum wall and the eccentric sleeve bearings have occurred. Whitening occurs during the printing process due to wear and tear caused by the drum. The phenomenon of inaccurate overprinting directly leads to a decline in printing quality, making it difficult to guarantee customer requirements.
Causes of wear:
The B-B type Gaussian will have a large impact in the printing of the two rubber roller word gaps. Vibration, due to printing pressure, self-gravity and centrifugal force of the drum, especially in the case of sudden paper break (when the paper breakage fails), the drum continues to run to produce a large number of paper rolls, and the sharply increased pressure causes the rollers to accumulate with each other and the eccentric sleeve The wall plate rotates in the air and rubs against the wall plate to cause wear and tear. The result is that the wall plate is irregularly enlarged. . Eccentric sleeves and wall-walled manufacturing materials, heat treatment processes, and poor lubrication can cause wall-to-wall wear.
Basic method of repairing deformation
1: The basic principle of repairing deformation
The coaxial wall error is required between each pair of airspaces, and the parallelism error between the two pairs of air is controlled between 0.01-0.02mm.
2: Repair method and operation steps (take Eastern Gauss manual hollowing as an example)
There are motor drive cutouts and manual cutouts. Take the 2-3 version of the roll as a benchmark. The wall's empty wear is superimposed by the impact forces in several directions. . The measurement is repeated on the circumference according to the direction of the impact force, the empty center is initially corrected, and the reference mandrel 1 is mounted. The other mandrel 2 is supported by the blanking plate to be hollowed out on both sides of the wall plate to be hollowed out (fixed to be corrected after being corrected). The relationship between the reference rod 1 and the mandrel 2 was measured with a dial gauge and debugged so that the main and side busbar values were between 0.01 and 0.02 mm. After positioning, measure the empty center again. If the above two parallelism error values are not within the required range, it means that the coaxiality of a pair of air is not between 0.01-0.02mm, and the empty center must be measured. If it is within the required range, it can be hollowed out.
3 short:
After the parallelism of the main side busbar reaches the requirement, the flange of the mandrel 2 is fixed on the wall plate, and the mandrel 2 and the reference sleeve to be hollowed out are removed, and the mandrel 2 with the hollow tool holder is installed. It is directly hollowed out by the flanges fixed on both sides of the hollow to be hollowed out. The hollowing out is less for each feeding, the speed of the cutting is uniform, and it cannot be rushed to make the maximum deformation of the air, and the machining accuracy is ensured as little as possible.
4: Testing
After the hollowing out, a pair of shoulder sleeves are machined according to the empty size to achieve the intermittent tolerance of the new hollow sliding fit. The upper sleeve and the core rod are installed in the wall plate to measure the relationship between the hollowed out and the reference space. Busbar parallelism, the error should be controlled at 0.01-0.02mm, if not reached, the above steps should be repeated.
After the is empty, replace the newly processed eccentric sleeve to reassemble the machine, replace the other parts that need to be replaced, and finally debug and debug.