Problem
Machining problem to solve
Complex automotive part geometryTight tolerance controlStable batch production
Case Study
Automotive Case Study 06 / 20E-Axle Housing Machining Case Study
The E-Axle housing is the core structural component of an integrated electric drive system.
e-axle housing machining case studyautomotive cnc machining case studycnc machine for automotive parts
Case Overview
Core project data for this machining case.
Industry Electric Vehicles
Product E-Axle Housing
Material A356-T6 / ADC12 / AlSi10Mg
Process Die Casting + Heat Treatment + CNC Machining
Machine Model HYR VMC1165
Tolerance +/-0.02 mm
Surface Finish Ra0.8
Production Capacity Project based
Solution
HYR-CNC machining plan
The customer is an electric drive system manufacturer supplying:Passenger EVsElectric SUVsElectric commercial vehiclesHybrid vehiclesTheir E-Axle housing integrates:
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 High Pressure Die Casting
03 Heat Treatment
04 Shot Blasting
Full Case Article
Machining background, difficulty and solution logic.
Quick Facts
Item Details Industry Electric Vehicles Product E-Axle Housing Material A356-T6 / ADC12 / AlSi10Mg Manufacturing Process Die Casting + Heat Treatment + CNC Machining Machine HYR VMC1165 Tolerance +/-0.02 mm Bearing Bore Concentricity ≤0.015 mm Surface Finish Ra0.8 Application Integrated Electric Drive System
Introduction
The E-Axle housing is the core structural component of an integrated electric drive system.
Unlike conventional vehicles where the motor, gearbox and differential are separated, modern electric vehicles increasingly adopt integrated E-Axle systems that combine:
into a single compact assembly.
The E-Axle housing supports all these critical components while maintaining:
Because the housing contains multiple bearing bores, complex cavities, cooling passages and installation surfaces, CNC machining is one of the most critical manufacturing processes.
Electric motor Reduction gearbox Differential Inverter Cooling system Precise bearing alignment Gear meshing accuracy Structural rigidity Thermal stability Cooling performance
Customer Background
The customer is an electric drive system manufacturer supplying:
Their E-Axle housing integrates:
The customer encountered several production problems:
HYR CNC developed a dedicated machining solution to improve accuracy and production efficiency.
Passenger EVs Electric SUVs Electric commercial vehicles Hybrid vehicles Motor chamber Gearbox chamber Differential housing Cooling channels Bearing seats Sensor interfaces Mounting brackets Gear noise after assembly Bearing bore misalignment Cooling channel leakage Inconsistent surface finish Poor assembly repeatability
Industry Background
The electric drive industry is rapidly shifting toward:
Integrated Electric Drive Units
Traditional designs:
Modern designs:
Advantages:
Motor + Gearbox + Differential Integrated E-Axle Lower weight Smaller size Higher efficiency Reduced assembly cost
High-Speed Motors
Modern EV motors often operate at:
Higher speed means:
12000 rpm ↓ 20000 rpm Higher bearing accuracy Better housing rigidity Improved thermal management Lower vibration
Lightweight Aluminum Structures
Popular materials include:
because they offer:
ADC12 A356-T6 AlSi10Mg Lightweight properties Excellent thermal conductivity Good casting performance Superior machinability
A356-T6
A356-T6 is widely used in premium E-Axle housings.
Advantages:
Applications:
High strength Excellent thermal conductivity Good fatigue resistance Stable machining performance Motor chambers Gearbox housings Integrated drive systems
ADC12
ADC12 is suitable for:
Advantages:
Medium-power E-Axles High-volume production Excellent casting fluidity Good dimensional stability High productivity
AlSi10Mg
AlSi10Mg is becoming increasingly popular.
Advantages:
Applications:
High strength Excellent thermal performance Suitable for thin-wall structures Lightweight E-Axles High-performance EVs Integrated drive systems
Manufacturing Process
Typical manufacturing process:
Among these processes, CNC machining determines the final drive accuracy and NVH performance.
High Pressure Die Casting ↓ Heat Treatment ↓ Shot Blasting ↓ Leak Testing ↓ Rough CNC Machining ↓ Semi Finishing ↓ Bearing Bore Machining ↓ Gearbox Surface Machining ↓ Finish Milling ↓ Deburring ↓ CMM Inspection ↓ Assembly
Why CNC Machining Is Necessary
E-Axle housings are among the most demanding aluminum components in EV manufacturing.
Casting alone cannot meet the required accuracy.
Bearing Bores
E-Axle housings contain:
Requirements:
Poor bore accuracy causes:
Motor bearing seats Gear shaft bearings Differential bearings Concentricity ≤0.015 mm Bearing wear Increased vibration Gear noise Reduced lifespan
Gearbox Interfaces
The gearbox chamber requires:
Poor machining causes:
Flatness ≤0.03 mm Parallelism ≤0.02 mm Gear meshing errors Transmission noise Increased friction
Cooling Systems
Integrated cooling channels require:
Typical requirement:
Poor machining may result in coolant leakage.
Smooth sealing surfaces Precise coolant ports Accurate groove dimensions Surface Finish Ra0.8
1. Multiple Bearing Bores
An E-Axle housing often contains:
Challenges:
Typical requirement:
Motor bearing bores Intermediate shaft bores Differential bearing bores Maintaining coaxiality Thermal deformation Multiple setup errors Coaxiality ≤0.015 mm
2. Complex Internal Cavities
The housing integrates:
Challenges:
Machining strategies must be carefully optimized.
Motor chamber Gear chamber Differential cavity Cooling passages Tool interference Difficult chip evacuation Uneven cutting forces
3. Thin-Wall Aluminum Structures
Typical wall thickness:
Thin walls tend to:
Stable machining requires:
3 mm ↓ 8 mm Vibrate Warp Produce chatter marks High rigidity Optimized fixtures Balanced cutting parameters
HYR CNC Solution
HYR recommended the VMC1165 Vertical Machining Center.
Large Machining Envelope
Travel:
Suitable for:
Axis Travel X 1100 mm Y 650 mm Z 600 mm E-Axle housings Gearbox housings Motor housings Large aluminum castings
High Rigidity Structure
Features:
Benefits:
Reinforced cast iron bed Wide-span column Large guideway spacing Reduced vibration Better bore accuracy Stable surface finish
High-Speed Spindle
Spindle:
Advantages:
BT40 12000 rpm Excellent aluminum machining Higher efficiency Better surface quality
Automatic Tool Changer
24-tool ATC.
Supports:
Reducing setup time and improving productivity.
Face milling Boring Reaming Drilling Tapping Chamfering
Step 1
Machine:
Remove casting allowance.
Rough Milling Reference surfaces Outer profiles Structural faces
Step 2
Machine:
Prepare for finishing.
Semi Finishing Motor chamber Gearbox interfaces Differential cavity
Step 3
Machine:
Requirement:
Bearing Bore Machining Motor bearing bores Gear shaft bores Differential bearing seats Concentricity ≤0.015 mm
Step 4
Machine:
Achieve required flatness.
Gearbox Surface Machining Gearbox interfaces Mounting surfaces Sealing grooves
Step 5
Machine:
Hole Machining Sensor holes Cooling ports Thread holes Mounting holes
Step 6
Remove:
Improve assembly safety.
Deburring Burrs Sharp edges
Step 7
Inspect:
Guarantee machining quality.
Final Inspection Bore accuracy Flatness Surface finish Geometric tolerances
Cutting Parameters
Typical machining parameters:
Item Value Spindle Speed 9500 rpm Feed Rate 2000 mm/min Tool Material Carbide Coolant High Pressure Depth of Cut 0.5 mm Surface Finish Ra0.8
Quality Inspection
Every E-Axle housing undergoes strict inspection.
Bearing Bore Inspection
Requirement:
Inspect:
Concentricity ≤0.015 mm Roundness Cylindricity Coaxiality
Surface Finish
Requirement:
Inspect:
Ra0.8 Gearbox interfaces Bearing seats Cooling surfaces
Hole Position Inspection
Requirement:
Inspect:
+/-0.02 mm Sensor holes Cooling ports Thread holes
CMM Inspection
Verify:
Ensuring complete dimensional accuracy.
Geometric tolerances Hole positions Parallelism Flatness
Results
After adopting HYR CNC machining solutions:
The customer achieved:
Item Before After Bore Concentricity 0.04 mm 0.015 mm Surface Finish Ra1.6 Ra0.8 Hole Position 0.05 mm 0.02 mm Cycle Time 78 min 56 min Scrap Rate 4.5% 0.8% Lower gearbox noise Better motor efficiency Improved assembly consistency Reduced production cost Higher productivity
HYR VMC850
Suitable for:
Inverter Housings Cooling Plates Electronic Housings
HYR VMC1060
Recommended for:
Motor Housings Gearbox Housings Medium Aluminum Castings
HYR VMC1165
Ideal for:
E-Axle Housings Integrated Drive Units Large EV Components
Related Articles
What Is CNC Milling?
Motor Housing Machining Case Study Inverter Housing Machining Case Study EV Battery Tray Machining Case Study Aluminum Machining Guide Surface Finish Explained
What is an E-Axle housing?
An E-Axle housing is the structural component that integrates the motor, gearbox and differential into a single electric drive unit.
Which materials are commonly used?
A356-T6, ADC12 and AlSi10Mg are widely used due to their lightweight properties and excellent thermal performance.
Why is CNC machining necessary?
Critical features such as bearing bores, gearbox interfaces and cooling channels require precision machining that cannot be achieved by casting alone.
What concentricity is required?
Most E-Axle housings require bearing bore concentricity of 0.015 mm or better.
Which CNC machine is suitable?
The HYR VMC1165 is an excellent solution for machining E-Axle housings and integrated electric drive components.
Conclusion
Integrated electric drive systems are becoming the mainstream architecture for modern electric vehicles, and E-Axle housings are among the most critical structural components.
From bearing bores and gearbox interfaces to cooling channels and sealing surfaces, every critical feature depends on high-precision CNC machining.
With excellent aluminum machining capability, high rigidity and stable machining accuracy, HYR CNC machining centers provide reliable and efficient solutions for E-Axle housing manufacturing.
HYR CNC continues to support global EV manufacturers with advanced machining technology and customized electric drive 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 e-axle housing 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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