Numerical methods for calculations of billet feed halfpitch in the process of piercing on cross rolling mill

The paper considers the problem of calculating feed halfpitch in piercing of pipes. The authors propose three new concepts: instant feed halfpitch, true feed halfpitch forward along the billet axis and true feed halfpitch back along the billet axis, and propose methods for calculations these characteristics. For calculation of instant feed halfpitch a new formula is given. For calculation of true feed halfpitch two algorithms are proposed based on a cycle with a condition. These algorithms can be useful in engineering and scientific practice to analyze the stress-strain conditions and speeds of strain. These data will be useful in the work for producing shells with required structure and mechanical properties. The paper gives data for calculation of feed halfpitch, analyzes the necessity and utility of applying these parameters.