In the wind power industry, the development and application of the plate rolling machine is crucial, covering a number of key issues, including the structure of the plate rolling machine, roll design, frame strength, feeding method, etc. The following is a discussion of these key issues:
Structural problems of the rolling machine
In the application of the plate rolling machine in the wind power industry, it is usually necessary to roll the plate into a cylinder, which involves five main steps: plate centering, end pre-bending, continuous rolling, end pre-bending and final closing. Among them, the springback of the plate and the plate is one of the main problems affecting the rolling accuracy. In addition, the deformation of the rollers and the frame also has an important influence on the rolling accuracy. Therefore, in the development process, the following key issues need to be fully resolved:
- Precise control of sheet centering: How to ensure that the sheet always maintains an accurate centered position during the plate rolling process, so as to avoid affecting the accuracy and shape of the rolling.
- Control of plate springback: How to reduce the springback phenomenon of the plate after rolling, so as to ensure that the rolled workpiece reaches the expected geometric shape and size.
- Deformation of rolls and frames: How to study and solve the deformation mechanism of work rolls and frames in the coiling process, and what compensation scheme to adopt to improve rolling accuracy and workpiece quality.
Problems A: Bending Roller
The upper roll of the plate rolling machine is mainly subjected to the reaction force generated by the plate when it is bent, and the force acts in the vertical direction. This force form is similar to that of a simply supported beam. Simplify to a simply supported beam for approximate calculations.
As an important part of the plate rolling machine, the lower roll not only needs to use its own axis as the rotating shaft to drive the plate to move horizontally, but also cooperates with the upper roll to clamp the plate, and bears the pressing force and pressure brought by the upper roll and the plate. gravity.
Majoy 3 Problems
In the wind power industry, the roller of the plate rolling machine is an important part, which directly affects the forming quality and process efficiency of the plate coil. The following are key issues involving plate rolling machine rolls:
Force analysis of the upper and lower rollers: How to accurately analyze the force distribution of the upper and lower rolls during the plate rolling process to ensure proper force and pressing force.
Top roller deflection compensation: The top work roll will deflect when it is stressed, which may lead to poor seam and straightness deviation of the rolled workpiece. How to solve this problem by means of deflection compensation and improve rolling precision.
Working and pressing force of the lower rolls: How to design and control the lower rolls to ensure that they move the sheet horizontally in a proper manner while bearing the pressing force and gravity of the upper rolls.
In the rolling process, the upper work roll is the core part of the coiling. When the force is large, it will produce deflection, which makes the pressure distribution on the steel plate uneven, and then the rolled workpiece cannot be well closed. The degree and curvature cannot meet the technical requirements, which directly affects the rolling quality of the workpiece. To solve this problem, it is necessary to compensate the deflection of the work roll. The deflection of the upper roll of the plate bending machine is calculated by the approximate calculation of the simply supported beam. Under the condition of ensuring the maximum deflection, calculate the supporting reaction force of the upper roller to determine the uniform load on the upper roller. Use software to simulate the deflection distribution of the upper roll under this load to obtain the amount of deflection, and fine-tune the shape of the upper roll to compensate for the deflection in places where the deformation is too large, optimize the structural design, and improve the rolling accuracy of the product.
Problem B: Frame of the Plate Rolling Machine
As one of the key components of the plate rolling machine, the frame’s strength and stability are crucial to the safety and quality of rolling. The following are the key questions involving plate roll racks:
- Frame force analysis: How to accurately analyze the pressure and load on the frame during the plate rolling process to ensure that the strength and rigidity of the frame meet the requirements.
- The impact of the upper roller pressing down: When the upper roller is pressing down, it will generate greater pressure on the side of the frame. How to optimize the frame structure and reduce the weight of the frame while ensuring sufficient strength.
When the upper roller is pressed down, the connecting pressure generated by the bolts and oblique keys of the piston and cylinder liner will cause great pressure on the side of the frame, forming a lateral load pressure. On the premise that the strength and rigidity of the frame are sufficient, it can be reduced The thickness of the plate makes the frame structure in an optimal state, thereby reducing the weight of the frame and saving materials.
The feeding problem of the rolling machine
The application of automatic feeding in plate rolling machine is the key to improve efficiency and safety. The following are the key issues involved in loading plate rolls:
- Advantages of automatic feeding: Compared with the traditional method, the automatic feeding method has obvious improvements in efficiency and safety. How to give full play to the advantages of automatic feeding.
- Challenges of automatic feeding: Although automatic feeding has brought many benefits, it still faces some challenges in practical applications, such as uneven transportation of plates and cumbersome composite structures. How to solve these challenges and improve the stability and reliability of automatic feeding.
When the plate rolling machine is rolled, the material is automatically loaded through the conveyor belt. Compared with the traditional feeding method, the efficiency and safety are significantly improved. The application of the automatic feeding method is very important for improving the automation level and rolling quality of the plate rolling machine. helpful. At present, some factories have successfully realized the complete set of plate rolling machine and automatic feeding device, which can complete continuous actions such as automatic feeding, feeding, feeding, rolling, and discharging. However, this technology is not mature, and there are still problems such as plate Unstable transportation, bulky combination structure and other problems.
However, some advanced plate rolling machine manufacturers in China have a plate rolling machine that integrates automatic feeding, feeding, rolling, and discharging. Its unique hydraulic mechanical roller lifting system ensures that the rolling bending accuracy and repeatability. Their plate rolling machine is also composed of an automatic processing unit by combining the plate rolling machine with automatic feeding equipment, feeding horizontally through the feeding platform, and equipped with an automatic loading and unloading system. The structure of the automatic feeding device is relatively reasonable, and the movement mode combined with the servo motor and the cylinder is selected, and the operation is stable.
In the wind power industry, during the development of the plate rolling machine, the solution of the above key issues will directly affect the rolling accuracy, workpiece quality, production efficiency and safety. Therefore, in-depth study and resolution of these problems is not only of great significance to the performance improvement of the plate rolling machine, but also makes a positive contribution to the sustainable development of the wind power industry.