1、Why is the rebound of titanium material larger when cold stamping or cold bending? What are the influencing factors?

Titanium in cold stamping or cold bending rebound is larger, because the yield limit of titanium material and the elastic modulus of the ratio of large.

Cold stamping or cold bending is a combination of plastic and elastic deformation process, when the stamped or bent workpiece is unloaded, the elastic deformation of the part of the workpiece in an attempt to restore the original shape and rebound.

Elastic rebound makes the volume of the workpiece, such as changes in the volume, angularity and radius, affecting the accuracy of the workpiece.

There are many factors affecting springback, the most important of which are as follows.

a. The harder the material, the greater the rebound; b. The lower the modulus of elasticity, the greater the rebound.
b. The lower the modulus of elasticity and the higher the yield limit, the higher the springback;
c - For a certain value of bending angle, the thicker the part, the higher the stress at the outer edge and the higher the plastic deformation, then the springback is small;
d - The higher the deformation, the higher the springback;
e - Springback is higher in unidirectional bending than in multiple bending; f - Springback is higher in multiple bending; and g - Springback is higher in single direction bending than in multiple bending. The resilience of unidirectional bending is larger than that of multi-kok bending;
f- The resilience of free bending is three times larger than that of stamping with a die;
g- The higher the degree of cold hardening of the metal, the larger the resilience;
h- The resilience decreases as the temperature of the workpiece is increased during stamping or bending.

2、What should be paid attention to when cutting titanium?

Titanium in the cutting process should pay attention to the following characteristics of titanium: (1) titanium coefficient of friction.
(1) Titanium has a high coefficient of friction, which makes the chips easy to generate high temperature during the cutting process and accelerates the tool wear; (2) Titanium has a high thermal conductivity, which makes it easy to generate high temperature during the cutting process.

(2) The thermal conductivity of titanium is small, the chips are tough and do not curl, and the heat generated by friction with the tip of the tool is almost entirely concentrated on the cutting edge and the forward tilting surface of the tool, which results in burns on the cutting edge. Therefore, the amount of feed should not be too small, and the cutting speed should not be too high, or else it will be easy to stick to the knife and the fine titanium chips will burn, resulting in accidents; (3) Due to the elasticity of titanium, it is easy to produce high temperature during the cutting process.

(3) Due to the small modulus of elasticity of titanium, deep cutting of fine workpieces are prone to deflection, the workpiece is easy to leave the cutter, so it is necessary to install anti-vibration frame in processing.

(4) Titanium has high-temperature activity, which may lead to surface contamination of the workpiece during machining; (5) Because of the high-temperature activity of titanium, the workpiece may be easily contaminated.

(5) Titanium contains high hardness oxides, nitrides and carbides, so it is easy to cause rapid wear of the cutting edge of the cutting tool in the cutting process; (6) When cutting titanium, the cutting edge of the tool is easy to leave the cutting tool.

(6) When cutting titanium, the cutting force is small, and the cutting process is not easy to produce cutter marks, so it is possible to carry out processing with a high surface finish.