Determination of Selected Parameters of a Mobile Saw in an SVP Hot-Rolled Steel Production Line for Mine Supports

Abstract

According to the current coal industry development strategy, the majority of coal production comes from underground mines. Deep mining operations require advanced technology and support equipment, thus the demand for steel SVP (CBΠ) and certain types of U, I, and L-shaped steel is increasing. To meet this demand, Vinacomin Machinery Manufacturing Joint Stock Company (VMC) has invested in a modern steel rolling line with a capacity of approximately 80,000 tons/year. In the steel rolling line, steel billets are fed into a furnace at temperatures ranging from 1050°C to 1150°C, then passed through a shaping die to create the preliminary shape of the part. After the shaping process, the part, at a temperature of approximately 750°C, is cut into standard lengths by a sawing machine. Finally, the part is sent to a cooling area before being straightened by a straightening machine to ensure the desired dimensions and quality. In this study, the authors focused on the process of sawing the parts into segments after the rolling stage. The research content introduced the structure, working principle, and presented some theoretical foundations for calculating and designing the machine. In addition, the study has shown the relationship between the parameters in machine operation (cutting depth, feed rate, cutting speed, etc.). Based on this, a 3D sawing machine structure is constructed, and the optimal design of parts and sub-assemblies is calculated using NX12 software. The research results provide a reasonable machine structure and parameter set, which can be used as a reference for the design calculations of mobile sawing machines.