420j2 17-4ph Hard Stainless Steel Medical Parts Hollow Cnc Milling

Product Description

Openwork CNC Milling of 420J2 & 17-4PH Hardened Stainless Steel Medical Spare Parts is an advanced, precision manufacturing service dedicated to producing intricate, lightweight, yet structurally robust components for high-performance medical devices. Utilizing the superior hardness and wear resistance of martensitic 420J2 and precipitation-hardening 17-4PH stainless steels, this process involves the精密subtractive machining of complex internal cutouts, lattices, grids, and skeletal structures. These "openwork" designs reduce mass, allow for fluid/gas passage, enable integration with other components, and maintain essential strength. The parts are machined to micron-level tolerances, making them ideal for critical applications within surgical instruments, implants, and diagnostic equipment where precision, durability, and functional complexity are required.

Product Processing

1. Material Selection & Pre-Machining Heat Treat:

   • 420J2: Supplied in annealed condition. Parts are rough-machined to near-net shape, then undergo vacuum hardening and tempering to achieve final hardness (50-55 HRC).

   • 17-4PH: Supplied in Solution Treated (Condition A) state. Parts are fully machined to final dimensions in this soft state, then undergo precipitation hardening (aging, e.g., H900) to achieve high strength (up to 40-45 HRC).

2. 精密Multi-Axis CNC Milling Setup: The heat-treated (420J2) or soft (17-4PH) blanks are fixtured in high-precision 3+2 axis or 5-axis simultaneous CNC milling centers. Fixturing strategies are critical for thin-walled,镂空structures to prevent vibration and chatter.

3. Complex Openwork Machining (Core Process): Using long-reach, small-diameter end mills (down to 0.3mm), the intricate internal geometries are machined. This includes:

   • Creating internal lattice structures and honeycomb patterns.

   • Machining thin ribs, struts, and support webs.

   • Forming precise windows, large cutouts, and through-holes with complex perimeters.

   • Achieving deep cavities and undercuts in a single setup.

4. Post-Machining Heat Treat (for 17-4PH): After精密milling, 17-4PH components undergo precipitation hardening (aging). Precise temperature control is maintained to minimize distortion of the delicate openwork structure.

5. Stress Relief & Thermal Stabilization (Optional): For ultra-precision parts, a low-temperature stress relief or cryogenic treatment may be applied to ensure long-term dimensional stability.

6. Micro-Deburring & Super-Finishing: All internal edges and surfaces of the openwork are meticulously deburred using specialized techniques (ultrasonic, electrochemical). The parts then undergo electropolishing or micro-abrasive blasting to achieve a smooth, clean, and biocompatible finish.

7. Advanced Metrology & Inspection: Parts are inspected using non-contact methods like 3D optical scanning or micro-CT scanning to verify internal geometry, wall thickness consistency, and dimensional accuracy without damaging delicate features.

Product Applications

• Minimally Invasive Surgical Instruments: Lightweight,镂空jaws for forceps, baskets for stone retrieval, and articulated components for endoscopic tools.

• Orthopedic & Spinal Implants (Non-Bearing): Complex porous structures or lattice sections within fusion cages, bone graft containment meshes, or custom plates designed for bone ingrowth.

• Dental & CMF Implants/Guides: Patient-specific surgical guides with intricate cutouts for irrigation or visualization, or frameworks for prosthetics.

• Drug Delivery Device Components: Internal mechanisms with cutouts to reduce weight or house electronics in insulin pumps or auto-injectors.

• Diagnostic & Lab Equipment: Precision filter housings, sample holders, or sensor mounts with internal channels or weight-saving designs.

Product Technical Parameters (Detailed Table)