Transmission Case Rough Boring with Compressed Air Oil Mist Lubrication
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Solution Overview
Problem
Conventional machining lines for large transmission housings rely on costly and energy-intensive flood cooling with water/oil emulsion coolants, which generate significant waste and require expensive dedicated boring machines, while Minimum Quantity Lubrication (MQL) systems are not suitable for rough boring and face milling due to heat generation.
Innovation Solution
A method using a minimum quantity of lubrication with an oil mist in compressed air for rough boring and face milling, where machining chips are blown off through fluid drainage holes and the bell-shaped end of the housing, and the air/oil mist system is controlled to cool and lubricate tools, with adjustable flow rates for different cutting tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If flood cooling with water/oil emulsion coolant is used, then cooling of housing and chips is improved, but coolant consumption, waste disposal load, and energy usage increase
Solution Approach 1:
The patent changes the physical state and delivery method of the lubricant from liquid flood coolant to aerosol mist form, delivering it through compressed air nozzles directly at the cutting zone. This parameter change reduces coolant consumption by approximately 90% while maintaining effective cooling and lubrication during rough boring and face milling operations
Solution Approach 2:
The patent extracts and removes the water component from the traditional water/oil emulsion coolant, using only minimal oil mist combined with compressed air. This eliminates the need for large-volume coolant circulation systems and significantly reduces waste disposal requirements while still achieving the necessary cooling effect
2Temperature
If flood cooling system is used, then cooling capability is improved, but device complexity and manufacturing floor space increase
Solution Approach 1:
The patent removes the complex water/oil emulsion coolant circulation system entirely, replacing it with simple compressed air nozzles that deliver oil mist directly to the cutting zone. This eliminates pumps, filters, heat exchangers, and large storage tanks, significantly reducing device complexity and floor space requirements
Solution Approach 2:
The patent uses compressed air as the delivery medium for the oil mist, leveraging pneumatic principles to atomize and transport the lubricant to the cutting zone. This pneumatic delivery system is far simpler than hydraulic coolant circulation systems while providing effective cooling and lubrication
3Loss of substance
If MQL system is used for small features, then coolant consumption is reduced, but heat generation from rough boring and face milling cannot be managed
Solution Approach 1:
The patent optimizes the MQL system parameters for large-scale rough boring and face milling operations by increasing the oil mist delivery rate and using multiple nozzles positioned strategically around the cutting zone. This parameter optimization allows MQL to handle the high heat generation from these operations while maintaining minimal coolant consumption
Solution Approach 2:
The patent divides the single-point MQL approach into multiple nozzles positioned at different locations around the cutting zone, with each nozzle targeting specific areas of heat generation. This segmentation allows comprehensive cooling coverage across the large-diameter tools and workpieces while maintaining low overall coolant consumption
4Productivity
If dedicated boring machines with multiple cutting tools are used, then machining capability is improved, but changeover time and line downtime increase
Solution Approach 1:
The patent employs a universal boring bar design with interchangeable single-point cutting tools that can machine various diameters and configurations. This universal tooling system eliminates the need for dedicated multi-tool boring machines, allowing rapid changeover between different production runs while maintaining full machining capability through simple tool insert replacements
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces coolant consumption, waste, and energy usage, allows for efficient machining of large housings without dedicated machines, and minimizes downtime by using interchangeable tools and controlled air/oil mist lubrication.
Implementation Method 1
Compressed air supplied through the cutting head without the oil mist is also used to cool the housing
Implementation Method 2
supplying a machine tool cutting head with a flow of compressed air and an oil mist through an internal passage in the cutting head. The compressed air and an oil mist are sprayed from the cutting head to cool and lubricate the boring and face milling tools
Implementation Method 3
Machining chips are blown off the rough bored housing through the fluid drainage holes and through the bell-shaped end of the housing
Implementation Method 4
Machining chips are also blown off by the turbulent air flow created by rotation of the tool as the tool is retracted from the housing
Data Source
AI summary
A method of manufacturing a transmission case housing is provided wherein a minimum quantity of lubrication as a compressed air/oil mist is supplied as the housing is rough bored and face milled. The transmission case defines a plurality of transmission fluid drainage holes for draining transmission fluid from the transmission when installed in a vehicle. The housing is positioned with the fluid drainage holes below a central axis of the housing and a plurality of internal bores and faces are bored and face milled on the housing. The compressed air/oil mist is sprayed from the cutting head to cool and lubricate the boring and face milling tools. Machining chips are blown off the rough bored housing through the fluid drainage holes.