Nov. 22, 2019

Tension straightening is the application of a longitudinal tensile force to
the workpiece that exceeds the yield limit of the material, resulting in a
plastic extension to achieve shape defect correction, also known as drawing
straightening. In the straightening process, the tensile stress of the * Titanium
Bar*, the titanium wire, and the titanium tube, which often have wave shape
defects, is applied to the tension leveler before and after the material exceeds
the yield limit of the material. The tensile stress is superimposed on the
original residual stress of the titanium bar. At the residual stress (the wave
with the original extension), a part of the tensile stress is cancelled, so that
the actual deformation stress is reduced, and the plastic extension is small
when straightening. At the residual tensile stress (the extension is small), the
actual deformation stress increases due to the superposition of the tensile
stress, and the plastic elongation is large when straightening. As a result,
after the tension-straightened workpiece, the parts were evenly stretched, and
the wavy-shaped defects were thus obtained by eliminating the titanium tube and
straightening the titanium rod on the inclined roller type straightening
machine. Usually used in conjunction with pressure straightening, the workpiece
with a large degree of curvature is first straightened by a pressure
straightener and then straightened by a skew roll. The workpieces that need to
be straightened are sent to the corresponding straightening machine, and then
straightened in order according to the order after starting, and one
straightening one by one. The straightening quality is mainly determined by the
straightener pressure and the roll angle. The amount of pressure depends on the
type of alloy and the degree of curvature. In the case of a titanium alloy
having a high strength, the straightening pressure should be larger when the
degree of curvature is large, and vice versa. The size of the stick inclination
depends on the diameter of the workpiece, and the workpiece with a large
diameter should be larger than the small straightening angle. After the
straightening is completed, the unqualified workpiece should be returned and
re-straightened.

**Titanium Tubing**

Multi-roll straightening with a number of rolls greater than 4 (usually 5 to 29 rolls) is widely used in production for simple section workpieces. The working principle is to continuously repeat the three-point bending of the workpiece by each roller, thereby gradually reducing the variation range of the residual curvature of the workpiece.

The following * Titanium Sheet Gr7 Manufacturer* will share the basic principles
of roll straightening:

(1) Generally, the smaller the roller diameter and the larger the number of rollers, the higher the straightening accuracy; the smaller the roller pitch value of 5 is beneficial to the biting of the workpiece and the establishment of the straightening process.

(2) The main function of the roller before straightening is to reduce the difference of residual curvature along the length of the workpiece. The main function of the latter rollers is to reduce the residual curvature which tends to be uniform.

(3) The quality of the straightening quality depends mainly on the reasonable determination of the reverse bending rate of the workpiece under each roller. A large reverse bending rate is selected on the first few rolls (second and third rolls), and the reverse bending rate on the subsequent rolls is determined by exactly correcting the maximum residual curvature at the adjacent adjacent rolls.

(4) The harder the coefficient of hardening is 7, the more difficult it is to straighten the material. In this case, a larger reverse bending ratio and a larger number of straightening rolls and a smaller roll diameter are used.

The above is an overview of the tension of titanium alloy materials, I hope to help everyone.