Broaching Tool Internal Lubrication Layout for Heat and Chip Control
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Solution Overview
Problem
Conventional broaching tools in the aircraft industry face damage due to high thermomechanical stresses and inadequate lubrication, leading to chipping, tool breakage, and material integrity issues during complex shape machining.
Innovation Solution
A broaching tool with internal lubrication channels and a high-pressure lubrication system that delivers lubricant close to the cutting area, optimizing lubrication and reducing friction and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional broaching tools are used without internal lubrication channels, then the tool structure is simpler, but the tool suffers from chipping and breakage due to high thermomechanical stresses and inadequate lubrication
Solution Approach 1:
The broaching tool is segmented into multiple functional zones along its length, with lubrication channels positioned at specific intervals to deliver lubricant to different cutting areas. This segmentation allows targeted lubrication where needed while maintaining structural integrity
Solution Approach 2:
The lubrication channels are nested within the body of the broaching tool, with inlet orifices, channels, and outlet orifices integrated into the tool structure. The chip chamber is also nested within the tool body, creating a compact integrated system that delivers lubricant directly to the cutting interface
2Object-affected harmful factors
If lubricant is supplied from outside the broaching tool, then the lubrication system is simpler, but the lubricant cannot reach the cutting area effectively, leading to increased friction and heat generation
Solution Approach 1:
The lubrication channels act as intermediaries that transport lubricant from the inlet orifices to the outlet orifices positioned at the cutting area. This intermediary system ensures lubricant reaches the high-friction zone between the broaching tool and workpiece, reducing thermal softening and tool damage
Solution Approach 2:
The lubrication system uses hydraulic principles to deliver lubricant through pressurized channels to the cutting interface. The fluid dynamics of lubricant flow through the channels ensures effective delivery to the high-stress cutting areas, reducing friction and heat generation
3Adaptability or versatility
If multiple broaches are used on the same body to machine complex shapes, then the machining capability is improved, but the chip chamber becomes congested and lubrication becomes inadequate
Solution Approach 1:
The chip chamber is designed with three-dimensional spatial optimization to accommodate chips generated by multiple broaches. The chamber volume and geometry are configured to allow efficient chip evacuation while maintaining adequate space for lubricant circulation and heat dissipation in the congested multi-broach environment
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
The solution prevents tool damage, minimizes chip size, reduces machining time and costs, and extends tool service life by ensuring effective lubrication and reducing frictional heat.
Implementation Method 1
a plurality of lubrication channels intended to be supplied with lubricant, each lubrication channel having an inlet orifice arranged to receive the lubricant and at least one outlet orifice opening into the cavity
Implementation Method 2
A broaching tool with internal lubrication channels and a high-pressure lubrication system that delivers lubricant close to the cutting area
Implementation Method 3
the distance between the outlet orifices of two consecutive lubrication channels of the plurality of lubrication channels varies by moving away from or closer to the cutting face
Data Source
AI summary
A broaching tool includes at least one cutting zone with a cutting face that contacts a workpiece to remove material from the workpiece. At least one cavity corresponds to the cutting zone and is arranged to receive the removed material. A plurality of lubrication channels are supplied with lubricant, each lubrication channel having an inlet opening arranged to receive the lubricant and at least one outlet opening which opens into the cavity. The distance between the outlet openings of two consecutive lubrication channels varies further from the cutting face.