Titanium rod heating straightening process
Titanium rods and titanium alloys have low elastic modulus, high yield-to-strength ratio, and are difficult to cold straighten. Most are below 120GPa. Therefore, titanium rods and titanium alloy titanium rods will undergo large elastic deformation under small stress conditions, have large rebound, and are difficult to straighten. However, the yield strength ratio of many titanium alloys is between 0.9 and 1, so they are difficult to straighten. It is easy to break during the straightening process. Therefore, titanium rods and titanium alloy titanium rods generally need to be heat straightened to ensure the straightening effect. Commonly used straightening methods for titanium rods and titanium alloy titanium rods include pressure straightening and roller straightening. Small-size titanium rods generally use roller straightening, which has a higher rate. However, for small-sized titanium rods and titanium alloy rods, the ideal effect is often not achieved after multiple straightenings, and direct fractures often occur during the straightening process. This article studies the thermal straightening of titanium rods and titanium alloy small-sized titanium rods, and proposes a simple, convenient and low-investment heating straightening method.
The heating effect of the titanium rod is related to the corresponding current, voltage and energization time. During the heating test, the welding machine power supply can adjust the output current, so the heating effect of the titanium rod can be controlled by adjusting the current, thereby accurately controlling the heating temperature of the titanium rod. The titanium rod heating method used in the test is easy to master and control. After the titanium rod is heated to a certain temperature, it can be quickly straightened using a roller straightener. In the test, the welding machine power supply was used as the heating power supply for the GR5 titanium rod, forming a simple series circuit and easy to connect. GR5 titanium rods can achieve better straightening effects after heating for 2 to 3 minutes. At the same time, factories are generally equipped with welding machines. In actual production, the welding machines can be located next to the straightening machines to quickly and easily heat titanium rods. It occupies a small area, is suitable for equipment, and is easy to move. Secondly, the welding machine outputs high current and low voltage. For small-sized GR5 titanium alloy titanium rods, it can not only meet the requirements of rapid heating and achieve straightening effects, but also meet the requirements of safety, convenience, efficiency and low investment. The physical properties such as resistivity of titanium rods and titanium alloy titanium rods are similar. Therefore, other small-size titanium rods and titanium alloy titanium rods can be straightened using appropriate current and heating time.
Titanium rods and titanium alloy small titanium rods are generally produced by rolling. However, during heating, rolling and heat treatment, problems often occur due to uneven distribution of temperature and plastic deformation, as well as shearing, transportation and stacking. Different degrees of bending must be straightened to ensure that the curvature of the titanium rod can meet the usage requirements. The room temperature tensile index of titanium rods heated and straightened is basically the same as that of directly straightened titanium rods without heating, indicating that the heating straightening scheme does not affect the room temperature tensile properties of titanium rods. This process is applicable and feasible. At the same time, the yield-to-strength ratio of this alloy titanium rod reaches a maximum of 0.99. If cold straightening is used, it is easy to break and it is difficult to achieve the straightening effect.Current straightening equipment is often located far from heating facilities. When titanium rods and titanium alloy small titanium rods are heated and then transferred to the straightening equipment, the temperature of the titanium rods has often been severely lost, resulting in a significant reduction in the straightening effect. If the straightening of titanium rods and titanium alloy titanium rods is specially constructed accordingly Supporting heating and straightening facilities, the actual equipment utilization rate is low and the economy is poor. The dosage of titanium rods and titanium alloys is still relatively small. In the actual production process, the order quantity of a single batch is often only a few hundred kilograms, or even tens of kilograms, with a wide range of specifications. Generally, factories are often equipped with heating furnaces with large heating capabilities, and the furnace capacity can reach several tons or dozens of tons at a time. Therefore, when heating and straightening titanium rods and titanium alloy rods, the heating cost is often relatively high.
