The force application system of straightening machines serves as the core for precision calibration, requiring designs that meet the criteria of "multi-directional adjustability and precise controllability." Common force application methods include mechanical pressure (e.g., hydraulic cylinder pushing), mechanical tension (e.g., hydraulic drawing), or roller press straightening (e.g., alternating roll gap compression in multi-roll straightening machines). Some advanced equipment integrates hydraulic and mechanical composite force application to accommodate calibration needs for lamp posts with diverse cross-sections (circular, polygonal, conical) and materials (steel, aluminum alloy).
The precision of force application manifests in three critical aspects: force magnitude control, force application point positioning, and force timing sequence. Force magnitude control requires threshold values determined by material mechanical properties. For low-carbon steel lamp posts, reversible correction during elastic deformation can be achieved with minimal force, while plastic deformation stages necessitate greater yet controllable force application to prevent cross-sectional distortion caused by excessive stress. Force application point positioning relies on high-precision guide rails and steering mechanisms to ensure precise alignment between force application points and detection system-identified misalignment areas, thereby avoiding new deviations from "misaligned force application." Force timing sequence refers to the sequential application of corrective forces across multiple points, typically adhering to the principle of "whole-to-part, primary bending before secondary bending." For instance, initial end-pulling eliminates overall lateral bending, followed by mid-section thrusting to correct localized protrusions, effectively preventing interference between corrective measures at different structural locations.
Furthermore, dynamic monitoring during force application is equally critical. Advanced straightening machines are equipped with real-time force feedback and deformation monitoring modules that continuously collect rod strain data throughout the process. When deviations between actual deformation and theoretical values are detected, force parameters are immediately fine-tuned to maintain controlled correction parameters. This "force application, real-time monitoring, and instant adjustment" dynamic control mechanism effectively prevents insufficient or excessive corrections caused by material inhomogeneities (such as strength variations between weld reinforcement zones and base materials).
