In the realm of titanium tube manufacturing and application, the process of straightening holds paramount importance in ensuring the production of high-quality titanium products. To achieve optimal results, various advanced techniques are employed, each tailored to address specific imperfections in the tubes.
Tension Straightening
Tension straightening stands out as a highly effective method in the realm of titanium tube straightening. This technique involves applying vertical tension exceeding the material's yield limit, thereby inducing plastic elongation in the titanium tube to correct shape deformities. By subjecting the corrugated sections of the tube to tension stress, which combines with existing residual stresses, uniform elongation is achieved throughout the tube, effectively eliminating waveform defects.
Sinusoidal Straightening
Sinusoidal straightening, a technique well-suited for tubes with simple cross-sections such as titanium tubes and bars, is typically carried out using oblique roller straightening machines. These machines, equipped with multiple rollers ranging from 5 to 29, work by gradually reducing the range of curvature variations in the workpiece by consecutively bending it at three points. Sinusoidal straightening is often used in conjunction with pressure straightening. Initially, tubes with significant curvature are subjected to pressure straightening to some extent before undergoing sinusoidal straightening. The success of sinusoidal straightening depends on factors such as the pressure applied and the tilt angles of the rollers, which are determined by the tube's diameter and material composition.
Pressure Straightening
Pressure straightening is another vital method in the arsenal of titanium tube straightening techniques. This method involves inducing plastic deformation in the titanium tube by applying pressure, thereby rectifying any distortions present. The appropriate pressure for straightening is determined based on factors such as the tube's curvature and the yield strength of the alloy material used. Following the straightening process, a meticulous inspection is imperative. Tubes that do not meet the required standards must undergo re-straightening, while tubes with irreparable defects may need to be redirected for tension straightening.
