Innovative Design of Precision Flat steel Bar Finishing Equipment

Innovative Design of Precision Flat steel Bar Finishing Equipment

Precision flat steel bar finishing equipment is one of the key equipments used in the manufacture of membrane water-cooled walls for boilers. It is used for size finishing, leveling and straightening of annealed flat steel raw materials to meet the pre-weld requirements in size and shape. The membrane type water wall structure boiler has the advantages of high heat transfer efficiency, good sealing performance, light weight of the furnace wall, energy saving and small pollution. With the continuous improvement of boiler performance and environmental protection requirements, the application of membrane water wall has become increasingly widespread. Membrane water wall production technology includes precision flat steel bar production technology, pre-weld pretreatment technology and membrane water wall welding production technology. One of the keys to ensuring the quality of the membrane water wall manufacturing is to ensure the pitch accuracy between the membrane water wall tubes. Under the premise that the pitch of the membrane type water-cooled wall steel pipe is fixed, the gap between the flat steel bar and the steel pipe must be adjusted by the change of the width dimension of the flat steel. In addition, the effect of weld shrinkage on the pipe pitch after welding of the membrane type water wall is also compensated by adjusting the size of the flat steel bar. It can be seen that the flat rolling and size finishing technology of flat steel is an important process link in the manufacture of membrane water wall manufacturing.

Combined with the production process of precision flat steel, after comprehensive analysis, we propose the overall design of the production line as follows.

1. Finishing can be achieved by means of a roller or cold drawing technique, where the roller is selected taking into account the consistency of the structure and the roughness factor.

2. According to the correction theory, as the correction roller increases, the quality of the correction increases, but the power consumed will increase sharply, and the volume of the device will also increase. Therefore, taking into account the quality of correction and power consumption, five-roller non-drive correction is used.
3.  If an adjustable mechanical lengthening device is used, the drive system requires a hydraulic motor, which results in a higher cost of the mechanical lengthening device. Since the service life of the hydraulic motor is low, the photoelectric code is used for signal transmission, the ordinary motor is driven, and the working speed is adjusted and the flat steel cutting length is controlled by the AC frequency converter and the programmable controller.

4. Since the flat steel is annealed, the surface oil has been removed. During the finishing process, the scale is automatically peeled off after being pressed, so the derusting device can be omitted.

5. If a metal cutting solution is used, the machining speed will be limited, which does not meet the requirements of the automated production line, and the auxiliary working time increases, and the position of the tool is difficult to debug. The hydraulic punching and shearing processing speed is fast, and the equipment structure is simple, so the hydraulic punching and shearing scheme is adopted here.