Core Challenges1

Extreme material properties: the use of aviation-grade Inconel 718 special alloy, the surface hardness of 40-42HRC, the processing difficulty coefficient for ordinary structural steel 9-10 times;

Core Challenges 2

Complex hole system structure: in the compact space of Ф294×1367mm, it needs to be completed:
1. Tier-3 Holes: Ф36.5 (0~+0.05), Ф28.58 (0~+0.05), and eccentric 1mm Ф17 (0~+0.05)deep hole group, depth of 615mm, the requirements of straightness and coaxiality of the double guarantee, of which the bottom of the Ф28.58 holes need to be processed R2 transition arc;
2. Tier-2 Holes: Ф36.5 (0~+0.05) and Ф28.58 (0~+0.05) deep hole group, depth 591mm;

Core Challenges 3

Rigorous precision requirements: dimensional tolerance ≤ 0.05mm, coaxiality ≤ 0.05mm, hole surface roughness Ra ≤ 0.8μm.

Technological breakthrough

Through independent innovation and research and development of gun drilling and deep hole discharge composite machining technology, it realizes:
1. φ26 hole diameter, 700mm deep hole machining capacity
2. The key breakthrough of depth-to-diameter ratio ≥ 20
3. Double improvement of machining efficiency and quality, the technology successfully breaks the foreign monopoly and reaches the international advanced level.