Problem
Machining problem to solve
Complex automotive part geometryTight tolerance controlStable batch production
Case Study
Automotive Case Study 20 / 20Wheel Hub Machining Case Study
The wheel hub is one of the most important safety components in a vehicle.
wheel hub machining case studyautomotive cnc machining case studycnc machine for automotive parts
Case Overview
Core project data for this machining case.
Industry Automotive
Product Wheel Hub
Material Aluminum 6061-T6 / 6082-T6 / 7075-T6 / Alloy Steel
Process Forging + Heat Treatment + CNC Machining
Machine Model HYR VMC850 / VMC1060
Tolerance +/-0.01 mm
Surface Finish Ra0.8
Production Capacity Project based
Solution
HYR-CNC machining plan
The customer is a wheel hub manufacturer supplying:Passenger vehiclesSUVsSports carsElectric vehiclesProducts include:
Machine Used
Recommended machine configuration
Machine: HYR CNC machining center selected according to part size, material and tolerance
Process: Rough machining, semi-finishing, finish machining and inspection based on the document case
Accuracy Control: Fixture planning, deformation control, stable toolpath strategy and CMM inspection
Cost Method: Published with existing website assets first to keep implementation cost low
Process
Timeline from raw material to inspection.
01 Typical manufacturing process:
02 Forging
03 Heat Treatment
04 Shot Blasting
Full Case Article
Machining background, difficulty and solution logic.
Quick Facts
Item Details Industry Automotive Product Wheel Hub Material Aluminum 6061-T6 / 6082-T6 / 7075-T6 / Alloy Steel Manufacturing Process Forging + Heat Treatment + CNC Machining Machine HYR VMC850 / VMC1060 Tolerance +/-0.01 mm Bearing Bore Accuracy ≤0.008 mm Surface Finish Ra0.8 Application Passenger Cars / SUVs / EVs / Performance Cars
Introduction
The wheel hub is one of the most important safety components in a vehicle.
It connects:
Every force acting on the vehicle is ultimately transmitted through the wheel hub.
During operation, the hub experiences:
Its machining quality directly affects:
In modern electric vehicles, wheel hubs are becoming:
Wheel bearings Brake discs Suspension systems Tires Drive shafts Acceleration ↓ Braking ↓ Cornering ↓ Road Impact ↓ Continuous Cyclic Loads Vehicle safety Driving stability Wheel balance NVH performance Bearing life Tire wear Lighter Stronger More integrated More precise
Customer Background
The customer is a wheel hub manufacturer supplying:
Products include:
Annual production:
Main problems:
HYR CNC developed a dedicated machining solution optimized for forged wheel hubs.
Passenger vehicles SUVs Sports cars Electric vehicles Forged aluminum hubs Steel wheel hubs Lightweight EV hubs Performance racing hubs 300,000+ Wheel Hubs Bearing bore deviation Wheel imbalance Surface vibration marks Long machining cycles High scrap rates
Industry Background
Wheel hub technology is evolving rapidly.
Lightweight Trend
Traditional:
Benefits:
Steel ↓ Cast Aluminum ↓ Forged Aluminum ↓ Forged Magnesium Lower unsprung mass Improved handling Better fuel economy Longer EV range
Electric Vehicle Development
Electric vehicles create new requirements:
Thus:
Wheel hubs require:
Higher Torque + Heavier Battery Packs + Larger Wheels Higher strength Better fatigue resistance Tighter machining tolerances
High Performance Vehicles
Sports cars require:
Wheel imbalance may cause:
Light Weight + High Strength + Perfect Balance Steering vibration Tire wear Reduced handling performance
Aluminum 6061-T6
Advantages:
Applications:
Lightweight Good machinability Excellent corrosion resistance Passenger vehicles EV wheel hubs
Aluminum 6082-T6
Advantages:
Applications:
Higher strength Good fatigue resistance SUVs High-performance vehicles
Aluminum 7075-T6
Advantages:
Applications:
Aircraft Grade Ultra High Strength Racing cars Premium sports cars Lightweight wheel systems
Alloy Steel
Advantages:
Applications:
Excellent wear resistance Superior fatigue strength Trucks Commercial vehicles
Manufacturing Process
Typical manufacturing process:
The bearing bore and balancing process are the most critical operations.
Forging ↓ Heat Treatment ↓ Shot Blasting ↓ Rough CNC Machining ↓ Semi Finishing ↓ Bearing Bore Machining ↓ Bolt Hole Machining ↓ Brake Mount Surface Machining ↓ Chamfering ↓ Deburring ↓ Dynamic Balancing ↓ Surface Treatment ↓ Inspection ↓ Assembly
Why CNC Machining Is Necessary
Forging creates:
However:
Forging cannot achieve:
Thus:
Precision CNC machining is essential.
Basic geometry Grain flow Structural strength Bearing bore accuracy Bolt hole positions Mounting surfaces Dynamic balance
Bearing Bore Accuracy
Requirements:
Poor machining causes:
Roundness ≤0.008 mm Tolerance +/-0.01 mm Bearing wear Wheel vibration Reduced safety
Bolt Hole Position
Requirements:
Poor machining causes:
Position Accuracy ≤0.015 mm Assembly difficulties Wheel runout Uneven load distribution
Brake Mounting Surface
Requirements:
Poor machining causes:
Flatness ≤0.02 mm Ra0.8 Brake vibration Noise Uneven braking force
1. Forged Material Hardness
Forged aluminum has:
Challenges:
High strength Dense grain structure Increased cutting force Tool wear Heat generation
2. Dynamic Balancing
Typical requirement:
Poor balance causes:
Residual Unbalance ≤5 g·cm Steering shake Tire wear Poor ride comfort
3. High Surface Finish
Wheel hubs are often visible components.
Requirements:
Challenges:
Ra0.8 No Tool Marks No Burrs Surface consistency Tool vibration Edge quality
Passenger Vehicle Wheel Hubs
Characteristics:
Typical material:
Lightweight Cost-effective High volume production 6061-T6
SUV Wheel Hubs
Characteristics:
Typical material:
Higher loads Larger wheel sizes Better fatigue resistance 6082-T6
Racing Wheel Hubs
Characteristics:
Typical material:
Extreme lightweight Ultra-high strength Superior balance 7075-T6
EV Wheel Hubs
Characteristics:
Applications:
High torque resistance Reduced weight Better NVH Electric sedans Electric SUVs Performance EVs
HYR CNC Solution
HYR recommends:
HYR VMC850
Suitable for:
Travel:
Advantages:
Aluminum wheel hubs EV wheel hubs 800×500×500 mm High-speed machining Excellent surface finish Superior aluminum cutting
HYR VMC1060
Suitable for:
Travel:
Advantages:
Forged hubs Steel hubs SUV wheel hubs 1000×600×600 mm Heavy cutting Better rigidity Stable accuracy
High-Speed Spindle
Spindle:
Benefits:
BT40 12000 rpm Better surface quality Reduced cycle time Excellent dimensional stability
Step 1
Machine:
Remove forging allowance.
Rough Milling External profiles Reference surfaces
Step 2
Machine:
Prepare for finishing.
Semi Finishing Structural features Internal cavities
Step 3
Requirement:
Machine:
Bearing Bore Machining ≤0.008 mm Bearing seats Hub center bores
Step 4
Requirement:
Machine:
Bolt Hole Machining ≤0.015 mm Wheel bolt holes Thread holes
Step 5
Requirement:
Machine:
Brake Surface Machining Ra0.8 Flatness ≤0.02 mm Brake mounting surfaces
Step 6
Remove:
Improve assembly safety.
Deburring Burrs Sharp edges
Step 7
Requirement:
Improve:
Dynamic Balancing ≤5 g·cm Vehicle stability Ride comfort Tire life
Step 8
Inspect:
Guarantee product quality.
Final Inspection Bore accuracy Surface finish Dynamic balance
Cutting Parameters
Item Value Spindle Speed 10000 rpm Feed Rate 2500 mm/min Tool Material Carbide Coolant Emulsion Depth of Cut 0.5 mm Surface Finish Ra0.8
Quality Inspection
Every wheel hub undergoes strict inspection.
Bore Inspection
Requirement:
Inspect:
≤0.008 mm Roundness Cylindricity Tolerance
Surface Inspection
Requirement:
Inspect:
Ra0.8 Roughness Flatness Appearance
Dynamic Balance Test
Requirement:
Guarantee:
≤5 g·cm Stable rotation Better ride quality
CMM Inspection
Verify:
Ensuring complete dimensional accuracy.
Hole positions Bore accuracy Geometric tolerances
Results
After adopting HYR CNC machining solutions:
The customer achieved:
Item Before After Bore Accuracy 0.02 mm 0.008 mm Surface Finish Ra1.6 Ra0.8 Residual Unbalance 12 g·cm 5 g·cm Cycle Time 28 min 18 min Scrap Rate 2.0% 0.2% Better wheel balance Improved driving stability Reduced vibration Higher production efficiency Lower manufacturing costs
HYR VMC850
Recommended for:
Aluminum Wheel Hubs EV Components Brake Components
HYR VMC1060
Suitable for:
Forged Wheel Hubs SUV Components Chassis Parts
HYR VMC1165
Ideal for:
Large Structural Components Battery Systems Heavy-Duty Parts
Related Articles
What Is Surface Finish?
Steering Knuckle Machining Case Study Brake Disc Machining Case Study Brake Caliper Machining Case Study Control Arm Machining Case Study Aluminum Machining Guide
What is a wheel hub?
A wheel hub connects the wheel, bearing, brake disc and suspension system, transmitting loads and torque during vehicle operation.
Which materials are commonly used?
Aluminum 6061-T6, 6082-T6, 7075-T6 and alloy steel are widely used.
Why is CNC machining necessary?
Critical features such as bearing bores, bolt holes and brake mounting surfaces require precision machining beyond forging capabilities.
What dynamic balance is required?
Most wheel hubs require residual unbalance of 5 g·cm or lower.
Which CNC machine is recommended?
HYR VMC850 and VMC1060 are excellent solutions for wheel hub machining.
Conclusion
Wheel hubs are among the most important safety components in modern vehicles.
From bearing bores and bolt holes to brake mounting surfaces and dynamic balancing, every critical feature requires precision CNC machining.
With excellent aluminum machining capability, stable dimensional accuracy and high production efficiency, HYR CNC machining centers provide reliable and efficient solutions for wheel hub manufacturing.
HYR CNC continues to support global automotive manufacturers with advanced machining technology and customized chassis production solutions.
Result
Before and after machining improvement.
| Item | Before | After |
|---|---|---|
| Result 1 | Before optimization | After adopting HYR CNC machining solutions: |
| Result 2 | Before optimization | Item |
| Result 3 | Before optimization | Before |
FAQ
Common buyer questions for this case.
What is this case about?
This article covers wheel hub machining requirements, challenges, process planning and CNC machine selection.
Which machine is recommended?
The final machine should be selected according to part size, material, tolerance, cycle time and fixture plan.
Can HYR-CNC support similar parts?
Yes. Send drawings, material, tolerance and volume so HYR-CNC can recommend a suitable machining proposal.
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