Customer Requirements
What the customer needed
Improve machining accuracyControl part deformationSupport stable automotive production
Case Study
Automotive Case Study 18 / 20Transmission Housing Machining Case Study
The transmission housing is the structural body of a transmission system.
transmission housing machining case studyautomotive cnc machining case studycnc machine for automotive parts
Project Overview
Standard case data fields.
Industry Automotive
Product Transmission Housing
Material Aluminum A356-T6 / ADC12 / Cast Iron
Process Casting + Heat Treatment + CNC Machining
Machine Model HYR VMC1060
Tolerance +/-0.01 mm
Surface Finish Ra0.8
Production Capacity Project based
Challenges
Machining difficulty
Complex automotive part geometryTight tolerance controlStable batch production
HYR CNC Solution
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
Machining Process
Timeline from raw material to inspection.
01 Material preparation
02 Rough machining
03 Semi-finishing
04 Finish machining
05 Inspection
Full Case Article
Machining background, difficulty and solution logic.
Quick Facts
Item Details Industry Automotive Product Transmission Housing Material Aluminum A356-T6 / ADC12 / Cast Iron Manufacturing Process Casting + Heat Treatment + CNC Machining Machine HYR VMC1060 Tolerance +/-0.01 mm Bearing Bore Coaxiality ≤0.01 mm Surface Finish Ra0.8 Application AT / CVT / DCT / EV Reducers
Introduction
The transmission housing is the structural body of a transmission system.
It supports:
It must withstand:
The machining quality of the housing directly affects:
Gear sets Bearings Shafts Oil channels Hydraulic systems Differential assemblies Torque ↓ Heat ↓ Vibration ↓ Impact Loads Transmission efficiency Gear meshing accuracy Noise Oil sealing Service life
Industry Background
Modern transmissions are evolving rapidly.
Traditional Automatic Transmission
Common types:
Contain:
Housing accuracy is critical.
AT CVT DCT 200+ Parts 50+ Machining Features
Electric Vehicle Reducers
EV transmissions are simpler:
But:
Speed increases dramatically.
This demands:
Ultra-high bearing accuracy.
Motor + Reducer + Differential = E-Axle 8000 rpm ↓ 12000 rpm ↓ 20000 rpm
Material Selection
Most transmission housings use:
Aluminum A356-T6
Advantages:
Lightweight Excellent machinability Good heat dissipation
ADC12
Advantages:
Excellent die casting performance Low cost High productivity
Cast Iron
Advantages:
Suitable for:
Excellent rigidity Wear resistance Heavy trucks Commercial vehicles
Why CNC Machining Is Necessary
Casting cannot guarantee:
Thus:
Critical surfaces must be machined.
Bearing bore accuracy Shaft alignment Sealing surfaces Gear center distances
Bearing Bores
Requirements:
Poor machining causes:
Coaxiality ≤0.01 mm Bearing failure Noise Gear wear
Sealing Surfaces
Requirements:
Poor machining causes:
Ra0.8 Flatness ≤0.03 mm Oil leakage Reduced reliability
Shaft Alignment
Requirements:
Poor alignment causes:
≤0.015 mm Gear noise Efficiency loss
Complex Cavities
Transmission housings contain:
Challenges:
Oil channels Bearing seats Hydraulic circuits Deep cavities Tool interference Chip evacuation
Thin Wall Structures
Typical thickness:
Problems:
3 mm ↓ 8 mm Vibration Deformation
Numerous Machining Features
A housing may contain:
Process stability is essential.
80+ Holes 20+ Bearing Seats 30+ Threads
HYR CNC Solution
HYR recommends:
VMC1060
Suitable for:
Travel:
AT housings DCT housings EV reducer housings 1000×600×600 mm
High Torque Spindle
Benefits:
BT40 12000 rpm Excellent aluminum machining Stable bore accuracy High efficiency
Automatic Tool Changer
24-tool ATC.
Supports:
Milling Boring Reaming Tapping
Quality Inspection
Inspect:
Requirement:
Bearing bores Shaft alignment Flatness Surface finish 100% CMM Inspection
Results
Item Before After Bore Accuracy 0.025 mm 0.01 mm Surface Finish Ra1.6 Ra0.8 Scrap Rate 2.2% 0.3% Cycle Time 35 min 23 min
Conclusion
Transmission housings require precision machining of bearing seats, sealing surfaces and shaft bores.
HYR CNC machining centers provide reliable and efficient solutions for modern transmission manufacturing.
Results
Before and after machining improvement.
| Item | Before | After |
|---|---|---|
| Result 1 | Before optimization | Item |
| Result 2 | Before optimization | Before |
| Result 3 | Before optimization | After |
FAQ
Common buyer questions for this case.
What is this case about?
This article covers transmission 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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