Straightening machine are a part of the metal industry. They are designed to help roll a rolled steel material to a flat product after the rolling process. This can correct surface defects that are caused due to residual stresses and also provide a better end product. Straightening machines are available in different models that have various specifications. They can be used for different kinds of rolled materials like rounds, sections and pipes. They can also be used to straighten a coil of steel material.
A straightening machine operates on the principle of elastic-plastic bending of the material by passing it between powered rolls arranged in a roll stand in two staggered rows. It is a very powerful and accurate system that can make the product flat and smooth. Its ability to do this is dependent on the number of power rollers, their diameter and the centre distance spacing. A standard modern straightening machine will have between five and 23 power rollers.
Depending on the material being straightened and the maximum allowable level of flatness required, the power requirement can vary significantly. The work rollers must be of sufficient size to generate a large amount of back bending, while the centre distance spacers need to be small enough to prevent excessive deflection across the width of the work roller.
In addition to the aforementioned factors, it is important to consider other variables that may affect the power requirements of the machine. For example, the thickness and width of the material, and the desired degree of flatness must be clearly defined. In addition, the minimum amount of roll penetration should be determined to avoid poor straightener efficiency or damaging the material.
The type of straightening machine is another important variable to consider. The two main types are power and pull through straighteners. A power straightener is driven by a motor and will have a higher capacity than a pull through machine. This is because a power straightener can produce a higher velocity of travel for the product. In contrast, a pull through straightener is powered by the feed and does not require a motor. This type of straightener is less expensive, but it can have problems with marking of the material from inertia during starts and stops.
In either case, the quality of a straightening machine depends on the amount of time the product spends between each set of rollers. A shorter time between sets will lead to a better surface finish and lower power requirement, while a longer straightening cycle will increase the likelihood of marks and inaccuracies in the finished product. In the end, attention to detail in defining all the relevant variables can ensure that the correct straightener is selected for the application. This will result in a high quality, cost effective, reliable product. It will also minimize production downtime and improve quality control. The best way to determine the appropriate straightener for a specific job is to consult with an experienced expert in the field.