Maijin-China's Premier Provider of Custom High-Tolerance CNC Parts for Global High-Tech Industries.
Precision CNC Milling Services
Deliver unmatched precision and quality with our advanced CNC milling solutions. We specialize in crafting complex, high-tolerance (down to ±0.01mm) custom parts from diverse metals and plastics. Utilizing state-of-the-art 3- to 5-axis machines, we efficiently produce prototypes and production runs. Our expertise spans aerospace, automotive, medical, electronics, and industrial sectors. We are committed to rigorous quality control and fast turnaround, ensuring your bespoke components meet exact specifications and accelerate your project success. Trust us to mill your vision into reality.
Our Advanced CNC Milling Capabilities
At Maijin Metal, we understand that advanced equipment is the cornerstone of delivering high-quality, high-precision machining services. We continuously invest in industry-leading CNC milling technology, equipped with cutting-edge 3-axis, 4-axis, and 5-axis machining centers. This ensures we can tackle challenges ranging from simple to highly complex part machining, meeting your most stringent requirements with precision.
Equipment: Modern machining centers (e.g., HAAS VF Series, DMG MORI CMX Series) with high-rigidity structures, high-power spindles (≤30,000 RPM), and precision ball screws/linear guides.
Performance & Precision: ±0.01mm (±0.0004’’) accuracy, superior thermal stability, and excellent surface finishes.
Core Advantage: Cost-effective solutions for planes, contours, slots, and rapid prototyping.
Performance & Precision: ±0.01mm (±0.0004’’) accuracy, superior thermal stability, and excellent surface finishes.
Core Advantage: Cost-effective solutions for planes, contours, slots, and rapid prototyping.
Equipment: Integrated high-precision rotary tables (A/B-axis, ≤±0.005° repeatability) with HEIDENHAIN/FANUC encoders.
Performance & Precision: ±0.015mm (±0.0006’’) multi-surface accuracy, reduced setups.
Core Advantage: Ideal for cams, gearboxes, and cylindrical features requiring angular machining.
Performance & Precision: ±0.015mm (±0.0006’’) multi-surface accuracy, reduced setups.
Core Advantage: Ideal for cams, gearboxes, and cylindrical features requiring angular machining.
Equipment: Simultaneous 5-axis centers (trunnion/dual-table) with SIEMENS/FANUC controls (≤42,000 RPM spindles, 0.0001° rotary resolution).
Performance & Precision: ±0.008mm (±0.0003’’) positioning accuracy for complex contours, molds, and aerospace parts.
Core Advantage: Single-setup machining of deep cavities, undercuts, and organic geometries.
Performance & Precision: ±0.008mm (±0.0003’’) positioning accuracy for complex contours, molds, and aerospace parts.
Core Advantage: Single-setup machining of deep cavities, undercuts, and organic geometries.
Technological Foundation | |
CNC Systems | SIEMENS 840D, FANUC 31i-B, HEIDENHAIN TNC640 |
Tooling | HSK/BT holders with carbide/CBN/PCD inserts |
Quality Assurance | On-machine probing, thermal compensation, and CAM-optimized strategies (PowerMill/HyperMill) |
Process Expertise | Cutting-parameter databases for 50+ metal/plastic alloys |
CNC Milling Materials
Core Challenge: Tool Wear in Ti-6Al-4V
Material Properties:
High strength/low thermal conductivity (λ ≈ 7.2 W/m·K → Heat concentrates at cutting edge)
High chemical reactivity (Diffusion wear with tool coatings at elevated temperatures)
Work hardening tendency (Hardness spikes 50% in shear zone)
High chemical reactivity (Diffusion wear with tool coatings at elevated temperatures)
Work hardening tendency (Hardness spikes 50% in shear zone)
Dominant Failure Modes: Crater Wear + Flank Wear → Catastrophic Chipping
Tooling Optimization Strategy
| Parameter | Technical Solution | Life Gain |
|---|---|---|
| Tool Substrate | Ultra-fine grain carbide (ISO M30-M40) ➤ Grain size ≤0.5µm, Fracture toughness ≥12 MPa·m¹/² |
+40% |
| Coating | Multilayer composite (AlTiN + TiAlSiN) ➤ Surface hardness ≥3,500 HV, Oxidation resistance: 900°C |
+60% |
| Geometry | High rake angle (γ₀=8°-12°) + Honed cutting edge (T-land: 0.1mm width, λₛ=25°) | +35% |
| Tool Type | Variable helix end mills (35°-42° unequal helix) ➤ Vibration suppression & force reduction |
+50% |
Inconel 718 Machining Challenge Matrix
| Parameter | Technical Solution | Life Gain |
|---|---|---|
| Tool Substrate | Ultra-fine grain carbide (ISO M30-M40) ➤ Grain size ≤0.5µm, Fracture toughness ≥12 MPa·m¹/² | +40% |
| Coating | Multilayer composite (AlTiN + TiAlSiN) ➤ Surface hardness ≥3,500 HV, Oxidation resistance: 900°C | +60% |
| Geometry | High rake angle (γ₀=8°-12°) + Honed cutting edge (T-land: 0.1mm width, λₛ=25°) | +35% |
| Tool Type | Variable helix end mills (35°-42° unequal helix) ➤ Vibration suppression & force reduction | +50% |
Stepped Cutting Parameter Database
Tool Requirements
Substrate: Micro-grain carbide (ISO S30-S40) / CBN for hardness >45 HRC
Coating: AlTiCrN + TiSiN multilayer (Thickness 4-6µm, HV≥3,800)
Geometry: Positive rake (γ=8°), reinforced cutting edge (T-land: 0.15mm×20°)
Coating: AlTiCrN + TiSiN multilayer (Thickness 4-6µm, HV≥3,800)
Geometry: Positive rake (γ=8°), reinforced cutting edge (T-land: 0.15mm×20°)
Parameters by Operation
| Parameter | Technical Solution | Life Gain |
|---|---|---|
| Tool Substrate | Ultra-fine grain carbide (ISO M30-M40) ➤ Grain size ≤0.5µm, Fracture toughness ≥12 MPa·m¹/² | +40% |
| Coating | Multilayer composite (AlTiN + TiAlSiN) ➤ Surface hardness ≥3,500 HV, Oxidation resistance: 900°C | +60% |
| Geometry | High rake angle (γ₀=8°-12°) + Honed cutting edge (T-land: 0.1mm width, λₛ=25°) | +35% |
| Tool Type | Variable helix end mills (35°-42° unequal helix) ➤ Vibration suppression & force reduction | +50% |
Carbon fiber layering control technology
Delamination Failure Mechanism Analysi
| Cause | Physical Mechanism | Impact Level |
|---|---|---|
| Interlaminar Shear Overload | Tool thrust > Matrix bond strength (≥20 MPa) | Edge chipping/Exit hole delam |
| Thermal Accumulation | Local resin temp > Tg (120-180°C) | Matrix softening → Fiber pullout |
| Resonance Vibration | Natural frequency match (500-1500Hz) | Micro-crack propagation |
| Tool Dulling | Edge radius > Ply thickness (0.125-0.25mm) | Compression-induced delam |
1. Tooling Optimizatio
| Parameter | Requirement | Recommended Solution |
|---|---|---|
| Tool Material | Hardness > HRC 90, Conductivity > 80 W/m·K | • PCD (Polycrystalline Diamond) • CVD Diamond Coating |
| Geometry | Rake angle γ₀: -5°~0°, Clearance α: 12°-15° | Split-point drill (Point Angle 100°-130°) |
| Edge Preparation | Edge radius ≤ 5μm | Ion Beam Figuring (IBF) + Nano-coating |
Dynamic Tool Management:
Auto tool-change when thrust force Fz > 80N
Laser edge roundness check every 50 holes (±2μm tolerance)
Laser edge roundness check every 50 holes (±2μm tolerance)
2. Precision Standards
| Accuracy Class | ISO 2768-mK | Medical/Optical Grade | Aerospace (AS9100) |
|---|---|---|---|
| Positioning Accuracy | ±0.008 mm | ±0.005 mm | ±0.003 mm (VDI 3441) |
| Repeatability | ±0.005 mm | ±0.003 mm | ±0.002 mm |
| Hole Position Tolerance | ±0.012 mm | ±0.008 mm | ±0.005 mm (DIN 876) |
| Form Tolerance | 0.02 mm/100mm | 0.01 mm/100mm | 0.005 mm/100mm |
| Surface Roughness | Ra 0.8 μm | Ra 0.2 μm | Ra 0.1 μm |
Advantage of CNC Milling
CNC Milling Industry Solutions
| Industry | Typical Parts | Key Challenges |
|---|---|---|
| Aerospace | Turbine blades, Engine mounts | Difficult-to-machine superalloys, Tight geometric tolerances (±0.015mm) |
| Medical Devices | Orthopedic implants, Surgical instruments | Biocompatibility requirements, Micro-feature precision (Ra<0.2μm) |
| Automotive Electronics | Motor housings, Sensor bases | Thin-wall deformation (<0.5mm), Multi-material integration |
| Energy & Nuclear | Valve seals, Reactor components | Radiation-resistant materials, Zero-leakage sealing surfaces |
| Semiconductor Equipment | Wafer fixtures, Vacuum chambers | Ultra-high flatness (0.005mm/100mm), Cleanroom requirements |
How CNC Milling Works?
CNC milling is a precise manufacturing process that involves removing material from a workpiece using rotating cutting tools. The process begins with a digital design, typically created in CAD software. This design is then converted into a CNC program, which dictates the movements of the milling machine.
The workpiece is securely fastened to the machine’s table, and the cutting tool, mounted on a spindle, rotates at high speeds. The machine follows the programmed path, making precise cuts to shape the material into the desired form. CNC milling can create complex shapes and features, such as slots, holes, and contours, with high accuracy.
Three-axis milling moves the tool along the X, Y, and Z axes. Four-axis milling adds rotation around one axis, while five-axis milling allows rotation around two axes, enabling more intricate designs. This versatility makes CNC milling essential in various industries, from aerospace to medical devices.
CNC Milling Workflow
Technical Input: 3D drawings (STEP/IGES), material specs, tolerance requirements (±0.003mm)
Service Selection: Prototyping / Low-volume / Mass production (1-50,000+ pcs)
24-Hour Response: Free DFM manufacturability analysis report
Service Selection: Prototyping / Low-volume / Mass production (1-50,000+ pcs)
24-Hour Response: Free DFM manufacturability analysis report
CAM Programming: PowerMill/HyperMill multi-axis toolpath optimization
Cutting Simulation: Predicts vibration/deformation/tool wear (<5% error)
Parameter Matching: Accesses 200+ material machining database
Cutting Simulation: Predicts vibration/deformation/tool wear (<5% error)
Parameter Matching: Accesses 200+ material machining database
Material Traceability: Aerospace titanium (AMS 4928) / Medical PEEK (ISO 10993)
Pre-hardening: Stress relief (-196°C cryogenic treatment)
Pre-inspection: Laser thickness gauge (±0.01mm)
Pre-hardening: Stress relief (-196°C cryogenic treatment)
Pre-inspection: Laser thickness gauge (±0.01mm)
Process Equipment Key Controls
Roughing: 5-axis high-speed mill (30k RPM) Cutting force monitoring (<80N)
Semi-finishing: Mill-turn centers Thermal compensation (20±0.5°C)
Finishing: Nanometric machining centers In-process surface profiler (Ra 0.1μm)
Roughing: 5-axis high-speed mill (30k RPM) Cutting force monitoring (<80N)
Semi-finishing: Mill-turn centers Thermal compensation (20±0.5°C)
Finishing: Nanometric machining centers In-process surface profiler (Ra 0.1μm)
First-Article Inspection: CMM (Zeiss CONTURA)
Critical Process SPC: CPK≥1.67 for key dimensions
AI Defect Detection: Micro-crack/burr auto-alert (>99% accuracy)
Critical Process SPC: CPK≥1.67 for key dimensions
AI Defect Detection: Micro-crack/burr auto-alert (>99% accuracy)
Deburring: Plasma polishing (30% Ra improvement)
Surface Treatment: Anodizing/passivation/sandblasting (optional)
Cleaning & Packaging: Class 1000 cleanroom (ISO 14644)
Surface Treatment: Anodizing/passivation/sandblasting (optional)
Cleaning & Packaging: Class 1000 cleanroom (ISO 14644)
Our Certificate
To keep improving the quality at the same time to optimize the processing technology so as to make our products to be more competitive in the market.
1. First Article Inspection (FAI)
Standards | AS9102 / ISO 9001 |
Full 3D Scanning | Zeiss CONTURA CMM + GOM ATOS optical scanning (±0.003mm accuracy) |
100% model-to-part GD&T analysis | |
Material Certification | PMA-MASTER Pro spectroscopy for alloy verification |
Mechanical property testing (yield strength/elongation) | |
Reporting | FAIR forms (PPAP Level 3 compliant) |
Critical characteristic CPK≥1.67 |
2. Production Part Approval Process (PPAP)
Compliance: AIAG / IATF 16949
| Core Documents | Maijin Metal Execution |
|---|---|
| Design Records | Customer drawings + DFM optimization |
| Process Flow Diagrams | Risk-annotated (FMEA RPN≤40) |
| Control Plans | 128 monitoring points (temp/vibration/dim.) |
| MSA Analysis | Gauge GR&R≤10% |
| Performance Testing | Thermal/vibration/salt spray tests |
| PSW Sign-off | Process freeze after customer approval |
Default PPAP Submission Level: Level 3 (full dimensional report + material certs)
3. End-to-End Quality Control
(1) In-Process Control
SPC Dashboards:
X-R control charts for critical dimensions (auto-sampled every 15 min)
Auto-alert threshold: ±3σ → Machine stoppage
X-R control charts for critical dimensions (auto-sampled every 15 min)
Auto-alert threshold: ±3σ → Machine stoppage
Error-Proofing:
RFID tool life monitoring (auto-change at 0.1mm wear)
Vision-guided part fixturing (≤0.01mm error)
RFID tool life monitoring (auto-change at 0.1mm wear)
Vision-guided part fixturing (≤0.01mm error)
(2) Quality Assurance Technologies
| Stage | Equipment/Method | Capability |
|---|---|---|
| Incoming Inspection | Handheld XRF spectrometer | Composition analysis ±0.01% |
| In-Process | In-line laser profiler (Keyence L-V) | Ra 0.05μm @ 50Hz sampling |
| Final Inspection | CMM + white-light interferometer (Bruker ContourGT) | Form tolerance ±0.001mm |
| Destructive Test | Metallographic section analysis (Zeiss Axio Imager) | Microstructure (1000× magnification) |
Three Core Strengths
19+ Years Specialized in Precision CNC Milling | 10000+ Complex Parts Mass-ProducedUltra-Precision Machining: ±0.003mm positioning accuracy (AS9100-certified)
Extreme Component Capability:
30:1 aspect ratio cavities (turbine engine components)
0.05mm thin-wall medical implants (FDA Class III compliant)
Yield Breakthrough: 99.8% first-pass yield (SPC data from 3,000+ projects)
Extreme Component Capability:
30:1 aspect ratio cavities (turbine engine components)
0.05mm thin-wall medical implants (FDA Class III compliant)
Yield Breakthrough: 99.8% first-pass yield (SPC data from 3,000+ projects)
ISO 9001:2015 Full-Process Quality System
Certification Scope: Key Technical Controls
Design Validation: FAI per AS9102
Process Monitoring: 128 real-time sensors (temp/vibration/dim.)
Certification Scope: Key Technical Controls
Design Validation: FAI per AS9102
Process Monitoring: 128 real-time sensors (temp/vibration/dim.)
Mission-Critical Component Supplier
BMW: E-drive housings (Aluminum alloy), Multi-material integration, leakage rate <0.1Pa·m³/s.
Ford: Sensor mounts (Ti alloy + PEEK), Synchronous machining, deformation <0.03mm,
Bosch: High-pressure fuel injectors (62 HRC stainless), Mirror milling Ra 0.05μm.
BMW: E-drive housings (Aluminum alloy), Multi-material integration, leakage rate <0.1Pa·m³/s.
Ford: Sensor mounts (Ti alloy + PEEK), Synchronous machining, deformation <0.03mm,
Bosch: High-pressure fuel injectors (62 HRC stainless), Mirror milling Ra 0.05μm.
Production Volume Solutions
| Production Mode | Application Scenario | Core Capabilities | Lead Time |
|---|---|---|---|
| Custom Prototyping | R&D validation, Functional testing | - 5-axis high-precision machining (±0.005mm) - 48-hour rapid prototyping - Free material trials (3 options) | 3-5 days |
| Low-Volume Production | Medical devices, Custom components | - Modular production lines (10-min changeover) - Hybrid material processing (metal/plastic) - Batch traceability system | 7-15 days |
| High-Volume Production | Automotive parts, Consumer electronics | - Automated cells (robotic fixturing + AGV logistics) - AI process monitoring (real-time CPK≥1.67) - Cost-optimized cutting parameter database | 10-25 days |
FAQ of CNC Milling
Smallest feature: ⌀0.05mm
Largest workpiece: 3500×2000×1000mm (multi-machine coordinated machining)
Oversize solution: Segmented machining + laser tracking (stitching accuracy ±0.02mm)
Largest workpiece: 3500×2000×1000mm (multi-machine coordinated machining)
Oversize solution: Segmented machining + laser tracking (stitching accuracy ±0.02mm)
Metals: Aluminum (7075/6061), stainless steel (316L/17-4PH), Carbon steel, Alloy Steel, Brass, Titanium alloys (Grade 5/23), superalloys (Inconel 718)
Urgent orders: 72 hours (1-10 pcs, air shipping supported)
Low-volume: 7-15 days (50-300 pcs)
High-volume: 25 days (5000+ pcs)
Low-volume: 7-15 days (50-300 pcs)
High-volume: 25 days (5000+ pcs)
Positioning accuracy: ±0.003mm (VDI 3441 compliant)
Surface roughness: Ra 0.2μm (mirror milling)
Surface roughness: Ra 0.2μm (mirror milling)
5-axis simultaneous machining: Contour accuracy ±0.008mm
Dedicated CAM modules: Auto-collision avoidance for impellers/turbines (0% collision rate)
Real-time compensation: Laser scanning + adaptive tool compensation (optimized per 0.1mm cut)
Dedicated CAM modules: Auto-collision avoidance for impellers/turbines (0% collision rate)
Real-time compensation: Laser scanning + adaptive tool compensation (optimized per 0.1mm cut)
Preferred Submission: STEP (.stp) file format
Critical Drawing Annotations:
Post-processing requirements (e.g., "Type III hard anodizing")
Surface roughness specifications (e.g., "Ra 0.8μm")
Post-processing requirements (e.g., "Type III hard anodizing")
Surface roughness specifications (e.g., "Ra 0.8μm")
Request a Quote for Your Project
The first thing we do is meeting with our clients and talk through their goals on a future project.
During this meeting, feel free to communicate your ideas and ask lots of questions.
We have achieved the stable sales record at the forefront of our industry in providing high quality products and services to our customers.
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Contact Details
Name: Maijin sales
Tel / Whatsapp: +8613632562601
Email: mj@chinamaijin.com
Add: 10F, 9 Building Block B, Bao Neng Science and Technology Park, NO.1 Qing Xiang Rd, Long Hua District, Shen Zhen City, China.
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