Problem
Machining problem to solve
Complex automotive part geometryTight tolerance controlStable batch production
Case Study
Automotive Case Study 05 / 20Inverter Housing Machining Case Study
The inverter is the control center of an electric drive system. It converts the direct current (DC) from the battery pack into alternating current (AC) to drive the electric motor while managing power distribution, regen...
inverter 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 EV Inverter Housing
Material ADC12 / A380 / A356 Aluminum Alloy
Process High Pressure Die Casting + CNC Machining
Machine Model HYR VMC850
Tolerance +/-0.02 mm
Surface Finish Ra0.8
Production Capacity Project based
Flatness ≤0.03 mm
Solution
HYR-CNC machining plan
The customer is a supplier of electric drive systems for:Passenger EVsPlug-in hybrid vehiclesElectric SUVsCommercial electric vehiclesThe inverter housing design includes:
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 The manufacturing process includes:
02 High Pressure Die Casting
03 Shot Blasting
04 Leak Test
Full Case Article
Machining background, difficulty and solution logic.
Quick Facts
Item Details Industry Electric Vehicles Product EV Inverter Housing Material ADC12 / A380 / A356 Aluminum Alloy Manufacturing Process High Pressure Die Casting + CNC Machining Machine HYR VMC850 Tolerance +/-0.02 mm Flatness ≤0.03 mm Surface Finish Ra0.8 Protection Level IP67 / IP68 Application Electric Drive Inverter System
Introduction
The inverter is the control center of an electric drive system. It converts the direct current (DC) from the battery pack into alternating current (AC) to drive the electric motor while managing power distribution, regenerative braking, and motor control strategies.
The inverter housing serves as both a protective enclosure and a thermal management component. It protects sensitive electronic devices from dust, moisture, vibration, and electromagnetic interference while also dissipating heat generated by high-power semiconductor modules.
Modern inverter housings integrate:
Due to the increasing integration of electric drive systems, inverter housings require exceptional dimensional accuracy, sealing performance, and surface quality.
Precision CNC machining has become indispensable in inverter housing manufacturing.
Cooling channels IGBT or SiC module mounting surfaces Water cooling interfaces Connector ports Sensor mounting holes EMC shielding structures
Customer Background
The customer is a supplier of electric drive systems for:
The inverter housing design includes:
The customer faced several production issues:
HYR CNC proposed a dedicated machining solution optimized for aluminum die castings and cooling structures.
Passenger EVs Plug-in hybrid vehicles Electric SUVs Commercial electric vehicles Integrated cooling channels Power module installation platform Water cooling inlet and outlet ports HV connector interfaces Signal connector holes Cover sealing surfaces Sensor mounting structures Cooling plate leakage Uneven module mounting surfaces Connector installation interference Cover sealing failure High rejection rates
Industry Background
The EV industry is rapidly adopting:
High Voltage Platforms
Modern EVs are shifting from:
Higher voltage systems require:
400V ↓ 800V More powerful inverters Better cooling performance More compact structures Higher machining accuracy
Silicon Carbide Technology
Silicon carbide (SiC) power modules generate:
This requires:
Higher switching frequency More power density Greater thermal loads Better cooling surfaces Higher flatness Improved thermal conductivity
Integrated Electric Drive Systems
Modern EVs increasingly combine:
into one integrated drive unit.
As integration increases:
Motor Inverter Gearbox Housing geometry becomes more complex Machining requirements become stricter
ADC12
ADC12 is the most widely used die casting alloy.
Advantages:
Applications:
Excellent casting fluidity High production efficiency Good machinability Inverter housings Electronic control housings Motor covers
A380 Aluminum Alloy
Advantages:
Applications:
Good mechanical strength Excellent casting performance Stable dimensions High-volume EV inverters Power electronic housings
A356 Aluminum Alloy
A356 provides:
Applications:
Better thermal conductivity Higher strength Improved fatigue resistance High-performance inverter housings Integrated drive units Water-cooled structures
Manufacturing Process
The manufacturing process includes:
CNC machining determines the final sealing performance and assembly precision.
High Pressure Die Casting ↓ Shot Blasting ↓ Leak Test ↓ Rough CNC Machining ↓ Semi Finishing ↓ Cooling Surface Machining ↓ Hole Machining ↓ Finish Machining ↓ Deburring ↓ Pressure Test ↓ CMM Inspection ↓ Assembly
Why CNC Machining Is Necessary
Many inverter housings are initially formed by die casting.
However:
Die casting alone cannot satisfy EV requirements.
Power Module Mounting Surfaces
The power module is mounted directly onto the housing.
Requirements:
Poor flatness causes:
Flatness ≤0.03 mm Surface Finish Ra0.8 Uneven thermal contact Increased thermal resistance Module overheating
Cooling Interfaces
Cooling systems require:
Typical requirement:
Improper machining may lead to:
Water-tight sealing Precise port positions Smooth sealing surfaces Position Accuracy +/-0.02 mm Coolant leakage Pressure loss Reduced cooling efficiency
Cover Sealing Surface
Most inverter housings require:
The sealing flange requires:
Only CNC machining can achieve these specifications consistently.
IP67 or IP68 Excellent flatness Uniform surface finish Precise bolt hole positions
1. Complex Cooling Structures
Modern inverter housings contain:
Challenges:
Maintaining accuracy throughout the entire structure is difficult.
Water jackets Narrow cooling channels Multiple sealing grooves Difficult chip evacuation Tool interference Heat accumulation
2. Thin-Wall Die Castings
Typical wall thickness:
Thin walls tend to:
Stable fixtures and optimized cutting strategies are essential.
2 mm ↓ 5 mm Vibrate Deform Produce chatter marks
3. Thermal Surface Accuracy
The power module mounting surface is extremely important.
Requirements:
Poor machining may cause:
Flatness ≤0.03 mm Surface Finish Ra0.8 Increased junction temperature Reduced inverter efficiency Premature module failure
HYR CNC Solution
HYR recommended the VMC850 Vertical Machining Center.
High-Speed Spindle
Spindle:
Benefits:
BT40 12000 rpm Excellent aluminum machining Better surface finish Reduced burr formation
High Rigidity Structure
Features:
Advantages:
High-strength cast iron bed Wide machine base Linear guideways Reduced vibration Stable flatness Improved surface quality
High Pressure Coolant
Advantages:
Especially suitable for:
Better chip removal Lower cutting temperature Improved tool life Deep grooves Cooling channels Small ports
Automatic Tool Changer
24-tool ATC.
Supports:
Improving production efficiency.
Face milling End milling Drilling Tapping Chamfering
Step 1
Machine:
Remove casting allowance.
Rough Milling Outer surfaces Reference planes
Step 2
Machine:
Prepare for finishing.
Semi Finishing Cooling surfaces Mounting faces Structural features
Step 3
Machine:
Achieve required flatness.
Cooling Surface Machining Cooling plate interface Water channel surfaces Sealing grooves
Step 4
Machine:
Hole Machining Connector holes Sensor holes Thread holes Mounting holes
Step 5
Machine:
Achieve final accuracy.
Finish Milling Sealing surfaces Cover interfaces Precision features
Step 6
Remove:
Improve assembly safety.
Deburring Burrs Sharp edges
Step 7
Test:
Ensure reliable operation.
Pressure Test Cooling channels Water sealing Leakage
Cutting Parameters
Typical machining parameters:
Item Value Spindle Speed 10000 rpm Feed Rate 2200 mm/min Tool Material Carbide Coolant High Pressure Depth of Cut 0.3 mm Surface Finish Ra0.8
Quality Inspection
Every inverter housing undergoes strict inspection.
Flatness Inspection
Requirement:
Inspect:
≤0.03 mm Cooling surfaces Power module platform Cover sealing surfaces
Surface Roughness
Requirement:
Ensures:
Ra0.8 Better thermal conductivity Reliable sealing Stable assembly
Hole Position Inspection
Requirement:
Inspect:
+/-0.02 mm Connector ports Mounting holes Sensor holes
Leak Test
Test:
Guaranteeing zero leakage.
Cooling channels Water pressure Sealing performance
Results
After adopting HYR CNC machining solutions:
The customer achieved:
Item Before After Flatness 0.08 mm 0.03 mm Surface Finish Ra1.6 Ra0.8 Hole Position 0.05 mm 0.02 mm Cycle Time 38 min 28 min Scrap Rate 3.5% 0.6% Improved thermal performance Better sealing reliability Higher assembly efficiency Reduced manufacturing costs
HYR VMC850
Recommended for:
Inverter Housings BDU Housings PDU Housings Cooling Plates
HYR VMC1060
Suitable for:
Motor Housings Integrated Drive Units Medium-size Aluminum Castings
HYR VMC1165
Ideal for:
Large E-Axle Housings Battery Enclosures Structural EV Components
Related Articles
What Is CNC Milling?
Motor Housing Machining Case Study Cooling Plate Machining Case Study EV Battery Tray Machining Case Study Aluminum Machining Guide Surface Finish Explained
What materials are commonly used for inverter housings?
ADC12, A380 and A356 aluminum alloys are commonly used due to their excellent casting properties, lightweight characteristics and thermal conductivity.
Why is CNC machining required?
Critical features such as cooling surfaces, module mounting faces and sealing interfaces require precision machining that cannot be achieved by die casting alone.
What flatness is required for cooling surfaces?
Most inverter housings require flatness of 0.03 mm or better.
What protection level is required?
Most EV inverter housings require IP67 or IP68 waterproof and dustproof protection.
Which CNC machine is suitable?
The HYR VMC850 is an excellent solution for precision machining of inverter housings and power electronic enclosures.
Conclusion
As EV power systems continue to evolve toward higher voltages and more integrated architectures, inverter housings require increasingly precise machining and better thermal management.
From cooling channels and sealing surfaces to module interfaces and connector ports, every critical feature directly affects inverter performance, efficiency and reliability.
With high-speed aluminum machining capability, stable accuracy and excellent surface quality, HYR CNC machining centers provide efficient and reliable solutions for modern inverter housing manufacturing.
HYR CNC continues to support global EV manufacturers with advanced machining technology and customized 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 ev inverter 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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