Gr2 Industrial Pure Titanium Tubes: CNC Cold-Bending Forming Technology And Application Advantages

Gr2 titanium tubes  are traditionally manufactured by hot‑bending and welding‑splicing processes, which suffer from low forming accuracy, degraded material properties of tubes, susceptible‑to‑corrosion weld seams and low finished‑product rate. As an automatic precision processing method carried out at ambient temperature, CNC cold‑bending forming matches the material characteristics of Gr2 pure titanium well and overcomes the shortcomings of conventional processes. It has become the mainstream technology for high‑precision titanium tube forming.

1. Material Properties

As a single‑phase α‑titanium alloy, it boasts the best cold‑formability among commercial pure titanium grades. It features favorable room‑temperature plasticity and enables the fabrication of complex special‑shaped tubes. Nevertheless, it has special processing characteristics and imposes high requirements on process conditions, laying the foundation for the application of CNC cold‑bending.

2. Processing Difficulties

Large spring‑back effect, prone to angular and radian deformation

Outer bending surface susceptible to cracking, inner bending surface prone to wrinkling; thin‑walled tubes tend to undergo elliptical deformation

Prone to work‑hardening at room temperature. Improper parameters will induce stress concentration and reduce fatigue life.

3. Process Advantages

Capable of forming at ambient temperature without heating. High‑quality cold‑bending can be realized through precise parameter adjustment.

1. Core Processing Equipment and System

Realize digital regulation of bending and feeding parameters. Multi‑axis linkage completes multiple consecutive bends in one pass without secondary clamping, eliminating errors caused by segmented processing.

Real‑time deformation monitoring collects deformation and stress data to dynamically adjust parameters and ensure processing stability.

2. Key Forming Process Flow

Raw material pretreatment: Remove surface defects; inspect wall thickness and roundness; anneal work‑hardened blanks to improve plasticity and prevent cracking.

Tooling commissioning: Select mandrels and dies according to tube specifications and set basic parameters.

Program import and clamping: Load programs and position‑clamp the tubes.

Low‑speed cold‑bending: Perform bending at a constant speed; mandrels support inner tube walls to suppress collapse and wrinkling.

Spring‑back compensation: Hold pressure after forming to counteract spring‑back deformation.

Inspection and shaping: Conduct precision verification and shaping to obtain finished products.

3. Key Control Points for Core Process Parameters

Parameters determine finished‑product quality and qualification rate:

Bending radius: 3D‑5D for thin‑walled tubes; 1.2D‑3.2D for thick‑walled tubes. Extreme bending is strictly prohibited to avoid cracking and wrinkling.

Processing speed: Adopt low‑speed and constant‑speed processing to avoid stress concentration and uneven deformation.

Spring‑back compensation: Adopt preset compensation values for tubes and implement pressure‑holding sizing to achieve angular accuracy of ±0.1°.

Mandrel selection: Select flexible mandrels matching inner diameters to fit tube walls and keep cross‑section ellipticity within standard limits.

1.Superior forming accuracy and consistency.

Digital‑controlled CNC cold‑bending realizes one‑shot forming of complex pipe fittings. Combined with spring‑back compensation, it delivers stable batch dimensions and strong interchangeability, meeting high‑precision assembly requirements in aviation and precision chemical industries.

2.Preserved material properties and extended service life.

Room‑temperature processing brings no thermal damage or weld seams. It avoids performance defects induced by hot‑bending and welding, retains titanium's excellent corrosion resistance and toughness, and extends service life by more than 30%.

3.High production efficiency suitable for mass production.

Multi‑directional bending is completed in one clamping. Post‑procedures such as welding and polishing are eliminated. Reusable programs and high‑level automation make it well‑suited for mass‑volume production.

Reliable forming quality with few defects. Mandrel support, constant‑speed forming and stress control reduce cracking, wrinkling, deformation and other defects. Finished products are free of hidden cracks and residual stress, and can serve under deep‑sea, high‑temperature and strongly corrosive working conditions.

4.Lower comprehensive costs.

It saves consumables and energy consumption, reduces labor, operation‑maintenance, rework and subsequent repair‑replacement costs, and realizes cost reduction and efficiency improvement.

1.Ocean engineering & seawater desalination

Resistant to chloride‑ion corrosion. Seamless cold‑bent pipe fittings are applied in seawater conveyance, heat exchange and hydraulic pipelines on offshore platforms to prevent corrosion‑induced leakage.

2.Chemical industry & new energy

Weld‑free structures resist corrosion and scouring from acids, alkalis and salts, applicable to pipelines for fine chemical, lithium‑battery and desulfurization equipment.

3.Aerospace & high‑end equipment

Light‑weight pipe fittings with high precision and stable performance are used in aviation hydraulic, fuel and instrument fluid pipelines to satisfy strict safety requirements for precision assembly.

4.Medical treatment & food‑pharmaceutical industry

Non‑toxic and corrosion‑resistant; smooth inner tube walls free of sanitary dead corners, complying with standards for clean‑medium conveyance industries.

As a direct manufacturer without middleman costs, Ruihang is specialized in R&D, production and sales. We mainly manufacture titanium products,such as titanium plates,sheets,bars,wires,tubes,forgings. The full range of titanium products are available, including Grade 1-4, Grade 5, Grade7, Grade9,Grade12, Grade23 etc.Our sales team is standing by to provide you with customized support. If you have purchasing needs on hand, feel free to contact us:Sam.Rui@bjrh-titanium.com