Key Parameters And Optimization Strategies For Titanium Alloy Sawing Process

Titanium alloy is a typical difficult-to-machine material featuring poor thermal conductivity, low elastic modulus, and high chemical activity at high temperatures, which leads to severe work hardening. During sawing blanking, common problems including saw blade adhesion, rapid tool wear, workpiece burning, dimensional tolerance out-of-limits and excessive burrs frequently occur, undermining processing efficiency and product quality. As the first critical working procedure for titanium alloy blanks, precise optimization of process parameters is essential to reduce consumable loss, stabilize production and control costs.

titanium grade 5 bars

titanium grade 2 bars

Grade7 Titanium round bar

Poor thermal conductivity traps cutting heat, resulting in high-temperature wear of saw teeth and thermal damage on workpiece surfaces.

Severe work hardening continuously increases cutting resistance, accelerating saw blade wear and impairing subsequent machining accuracy.

Strong adhesion at high temperatures causes tool adhesion and built-up edge formation, triggering section scratches and dimensional deviations.

Low elastic modulus leads to elastic springback during machining, insufficient cutting depth, sawing deflection and poor section quality.

1.Sawing Linear Speed

Linear speed governs cutting temperature and saw blade consumption. Low-speed sawing is recommended for titanium alloys: 20–40 m/min for cemented carbide saw blades and 15–30 m/min for coated high-speed steel saw blades. The lower speed range applies to thick or high-hardness workpieces such as Gr5, while thin plates can adopt moderately higher speeds to avoid tool adhesion and thermal deformation.

2.Feed Rate

Feed rate shall be matched with linear speed, combining low speed with small feed. Rough sawing: 0.15–0.3 mm per revolution; finish sawing: 0.05–0.15 mm per revolution. Reduce feed rate for large cross-section workpieces. Excessively fast feed causes tooth chipping and heavy burrs; overly slow feed aggravates work hardening and saw blade wear.

3.Cutting Depth

Insufficient cutting depth makes saw teeth rub against the hardened layer and accelerates wear; excessive cutting depth induces saw blade vibration, wavy sections and dimensional errors. Adopt layered sawing for thick workpieces and one-pass cutting for thin workpieces to ensure penetration through the hardened surface layer.

4.Tool Parameters

For titanium alloys with hardness below 36 HRC, staggered-tooth cemented carbide saw blades are preferred; cermet coated saw blades are used for high-precision machining. Tool selection principle: fine teeth for thin materials, coarse teeth for thick materials. Recommended rake angle: 10°–15°, clearance angle: 5°–8°. New saw blades require full running-in to prevent tooth chipping.

5.Cooling and Lubrication

Continuous cooling is mandatory, with coolant directly sprayed onto the cutting zone at a flow rate no less than 3 L/min. Special titanium alloy cutting fluid containing sulfur and phosphorus extreme pressure additives is adopted; high-pressure cooling at 5–20 MPa improves chip evacuation and inhibits built-up edge formation. Dry cutting and ordinary emulsions are forbidden to prevent workpiece burning.

1.Dynamic Hierarchical Parameter Optimization for Diverse Working Conditions

Establish a hierarchical parameter system categorized by titanium alloy grade and workpiece specification & precision. Differentiated sawing processes are formulated for Gr2,Gr5 and other alloys. Adjust cutting speed and depth according to workpiece thickness and hardness, and modify parameters in real time based on sawing load and blade wear to avoid tool overload and work hardening.

Specialized Tool Maintenance to Reduce Consumption and Improve Quality
Select coated cemented carbide or cermet saw blades according to production types without mixed use. Implement full-lifecycle management including saw blade running-in, on-machine inspection, post-cut cleaning and rust prevention, and replace dull saw teeth timely to extend tool service life.

2.Optimized Cooling Scheme for Enhanced Heat Dissipation and Anti-Adhesion

Replace flood cooling with high-pressure targeted jet cooling to fully cover the cutting zone. Match cutting fluid types with rough and finish machining respectively, and regularly test fluid concentration and cleanliness to guarantee cooling and lubrication performance.

3.Periodic Equipment Calibration for Stable Machining Accuracy

Inspect equipment before production, fasten transmission components, calibrate table levelness and feed accuracy to eliminate clearances and jitter. Lock process parameters for heavy-load machining to suppress vibration and reduce wavy sections and burr defects.

4.Standardized Operating Procedures to Avoid Human-Induced Defects

Implement exclusive sawing specifications for titanium alloys: clean surface impurities on workpieces and conduct rigid clamping; decelerate during workpiece entry and exit to buffer cutting impact; limit continuous processing duration and stop production periodically for cooling to mitigate work hardening.

5.Closed-Loop Quality Control for Iterative Process Improvement

Adopt closed-loop management covering trial cutting verification, in-process monitoring and post-production data review. Conduct trial cutting to confirm process parameters before mass production; monitor temperature, load and saw blade wear throughout processing; trace defects based on qualification rate to continuously upgrade sawing solutions.

Ruihang, a direct manufacturer of titanium products, supply optimal Titanium & Titanium Alloy Plate/Sheets, Bars, Pipes, Rings, Forging Stocks & Sections. For more details, please feel free to contact us via email: Sam.Rui@bjrh-titanium.com