Automotive Fuel Injection Valve Body Machining: 5‑Axis CNC Precision for High‑Pressure Applications

A Tier 1 automotive supplier in Japan needs to provide high-pressure fuel injection valve bodies for new engines, requiring high precision and consistency, with an annual demand of 120000 pieces.

The product is a stainless steel high-pressure fuel injection valve body with a working pressure of 20MPa, an inner hole accuracy of H6, and a surface roughness of Ra0.4 μ m. It needs to be submitted through PPAP Level 4.

The five axis CNC machining center is equipped with specialized fixtures and uses a high-pressure internal cooling tool system. The key inner hole adopts precision hinge technology, and the online measurement system 100% detects key dimensions. Establish SPC control chart monitoring process capability.

• Critical dimension CPK ≥ 1.67, stable process
• Surface roughness Ra0.3 μ m, better than design requirements
• Annual production capacity of 150000 pieces, meeting customer needs
• Delivery qualification rate of over 99.5% for 6 consecutive months
• 100% on-time delivery rate

The CNC machining of precision parts for automotive engines requires meeting the high standards of the automotive industry in terms of equipment capability, process optimization, and quality control. A sound quality system and stable production capacity are key to gaining recognition from automotive customers.