Multi-Pipe Wire Drawing for Uniform Longitudinal Shape

The patent applies preliminary action by pre-setting different longitudinal lengths for metal pipes with different deformation resistances before the wire drawing process. Specifically, pipes with higher deformation resistance are given longer initial lengths, while pipes with lower deformation resistance are given shorter initial lengths. This preliminary differentiation compensates for the varying deformation rates during drawing, ensuring that all pipes reach approximately the same final length and maintain uniform longitudinal cross-sectional shape.

The patent applies local quality by assigning different initial longitudinal lengths to different metal pipes based on their specific deformation resistance characteristics. Each pipe receives a customized initial length tailored to its material properties - pipes with higher deformation resistance (like copper) are given longer initial lengths, while pipes with lower deformation resistance (like aluminum or iron) are given shorter initial lengths. This localized differentiation allows all pipes to deform at different rates during simultaneous wire drawing while still achieving uniform final dimensions.

The patent applies preliminary action by pre-calculating and setting the optimal initial longitudinal lengths for each metal pipe type before the wire drawing process begins. This preliminary configuration ensures that after deformation, all pipes achieve approximately equal final lengths without requiring extensive cutting or trimming. By anticipating the deformation behavior of each material and pre-adjusting initial dimensions, the process minimizes material loss and reduces the need for post-processing cutting steps.