In the aerospace manufacturing industry, high-efficiency machining and cost control have always been dual challenges for enterprises. Particularly for cavity milling of high-strength titanium alloy structural components such as TC21, rapid tool wear and high costs have long been pain points in process innovation.

Recently, Suzhou Yongpu Precision Technology Co., Ltd. (hereinafter referred to as "Yongpu Precision") successfully assisted an aerospace customer in achieving a significant upgrade to their tooling solution through innovation in integrated tooling systems. By introducing the YPP Mill® split-type tapered ball nose end mill solution, they not only met stringent lifespan requirements but also reduced the cost per tool to one-fourth of the original, delivering remarkable cost reduction and efficiency improvement for the customer.

The machining object in this case is a typical aerospace structural component made of TC21 titanium alloy. This material is widely used in load-bearing components due to its high strength and excellent fatigue resistance. However, its low thermal conductivity, high chemical reactivity, and low elastic modulus make it a typical difficult-to-machine material.

• Machining Content: Cavity milling
• Original Solution: Solid carbide tapered ball nose end mill
• Cooling Method: External cooling with emulsion (concentration 7%~9%)

Facing the customer's pain points, Yongpu Precision did not simply provide a replacement tool; instead, they delivered a complete YPP Mill® modular tooling system solution. The core of this solution lies in the "split-type" design, separating the tool head from the tool shank, achieving a perfect balance between rigidity and economy.

Yongpu Precision Tooling Configuration:

1. Tool Head: YPP Mill® D12R6 carbide ball nose end mill (high-precision replaceable tool head)
2. Connection: Double-ended heat shrink extension bar (high-rigidity connection)
3. Tool Shank: Carbide tool shank (excellent vibration resistance)

The key reason this solution successfully replaces traditional solid carbide tools lies in its structural design's precise control over TC21 titanium alloy machining characteristics:

1. Extreme Rigidity, Suppressing Vibration:Vibration is the most taboo issue in titanium alloy machining. Yongpu Precision adopts a combination of carbide tool shank and double-ended heat shrink extension bar, greatly enhancing the overall rigidity of the tooling system. The heat shrink tool holder provides extremely high clamping precision and dynamic balance, effectively suppressing high-frequency vibration during machining and ensuring the surface quality of the cavity sidewalls.
2. Reduced Tool Change Costs, Reusable Tool Shank:When the cutting edge of a traditional solid carbide tool fails, the expensive tapered shank is also scrapped. However, with Yongpu Precision's YPP Mill® split-type solution, only the small D12R6 ball head at the front needs replacement, while the high-precision carbide tool shank and extension bar can be reused long-term. This is the technical foundation for "per-tool cost being only 1/4 of the original tool."
3. Geometric Design Specifically for TC21:Yongpu Precision's YPP Mill® D12R6 ball head tool head features a flute geometry and coating specially optimized for titanium alloy cutting. Under external cooling conditions with 7~9% concentration emulsion, it effectively evacuates chips and reduces the generation of built-up edges, ensuring the tool life meets customer requirements

After rigorous on-site cutting tests, Yongpu Precision's solution delivered an impressive performance report:

• Performance Achieved: Tool life fully meets customer requirements for single-batch machining, with no chipping or abnormal wear phenomena, and machined surface quality meets aviation standards.
• Cost Sharply Reduced: Because the expensive tool shank can be permanently reused, the cost per tool (amortized cutting edge cost) is only 1/4 of the original solid carbide tool.
• Annual Savings: Just for this single machining item, the direct tooling cost savings for the customer amount to an impressive ¥360,000 per year.