Generally in terms of the main shaft of the drum, according to loading conditions, it can be divided into the following two types:
1) The mandrel is only subjected to bending moments, such as the axis of the roller set;
2) The shaft receives both bending moment and torque, such as the shaft of the drive roller set;
The material of the shaft is generally rolled or forged carbon steel or alloy steel. The usual material is medium carbon steel. The 45th steel is most commonly used for shafts with large forces and limited dimensions, and some The special requirements of the shaft can be made of alloy steel, the material of which is selected to be zero-zero chromium. According to requirements, the shaft generally needs to be heat-treated or surface-strengthened in order to improve its mechanical properties and wear resistance. In general, alloy steel and carbon steel The difference in elastic modulus is very small, so the use of alloy steel can not increase the shaft stiffness;
The material of the shaft is generally subjected to quenching and tempering. For the roller group, when the shaft strength index does not meet the requirements, the quenched and tempered process can also be combined, and the permissible stress is checked according to the symmetrical cycle bending.
The technical requirements for the skin design are:
1) When the skin is curled, it must follow the rolling direction of the steel plate;
2) The amount of misalignment at the joint is not more than 1 mm;
3) Longitudinal welds after drum encapsulation must be subjected to ultrasonic or X-ray inspections:
1 Ultrasonic inspection is performed at 10%, and the weld reaches the secondary level of the standard;
2 ray detection from the end of the total length of 20% of the probe, the weld to reach the national standard, such as double the length of unqualified flaw detection, doubling is still not qualified for full-length testing, until the requirements are met;
4) The roundness tolerance of the cylinder roll should not exceed 0.5;
5) Material: Q235 steel, yield strength of 235 N / m;
For medium-sized drum sets and lightweight drum sets, when the outer diameter of the hub is greater than 220mm, cast steel is used. For the lightweight drum set, when the outer diameter of the hub is less than 220mm, the hot-rolled round steel shall be used and shall meet the national standards;
The production of roller mainly consists of roller body initial car, early school static balance, axle head interference assembly welding, finishing car and fine school dynamic balance and other processes. If the requirements for behavioral tolerances such as roundness, cylindricity, and straightness are below 0.2 mm, grinding on cylindrical grinding or roll grinders is required after finish turning. If the surface hardness is required, the heat treatment process needs to be increased.
After the roller is formed, the surface treatment or coating such as painting, galvanizing, TEFLON spraying, rubber coating, chrome plating, ceramic spraying and oxidation are also needed for the need of rust prevention, corrosion prevention, wear resistance and support.
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