Gear Tooth Finishing After Media Blasting to Restore Tip Geometry
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Solution Overview
Problem
Media blasting processes often result in radiused tips on gear teeth, which can alter functionality and create noise during operation, particularly in high KSI materials where the mushroom effect is more pronounced.
Innovation Solution
A two-step process involving media blasting followed by spindle-finishing or vibratory finishing to reduce or eliminate radiused tips, using different media types and automated transportation between the blasting and finishing apparatuses to enhance surface roughness and wear properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If media blasting is used to strengthen gear surfaces, then fatigue strength and surface durability are improved, but radiused tips are created on gear teeth
Solution Approach 1:
The finishing process is segmented into multiple zones: a first zone with lower media flow rate for general surface finishing, and a second zone with higher media flow rate specifically targeted at radiused tips. This segmentation allows different regions of the gear tooth to receive appropriately differentiated treatment, preserving sharp tips while maintaining surface durability improvements.
Solution Approach 2:
The system applies local quality by directing higher media flow rate specifically at areas with radiused tips (the second zone), while using lower media flow rate for other surfaces (first zone). This localized approach addresses the tip geometry problem without compromising the overall surface strengthening benefits.
2Stress or pressure
If high KSI media is used for peening, then compressive strength is improved, but mushroom effect on edges is intensified
Solution Approach 1:
The system dynamically adjusts media flow rate based on the specific zone being treated. By using controllable media sources that can vary flow rates, the system applies higher energy density selectively at radiused tips while using lower energy density for general surface areas, thereby preventing excessive mushrooming while maintaining compressive strength benefits.
Solution Approach 2:
The invention changes the parameter of media flow rate to resolve the contradiction. By varying the flow rate parameter across different zones (lower in first zone, higher in second zone), the system optimizes both compressive strength improvement and edge geometry preservation, preventing the intensification of mushroom effect.
3Productivity
If automated transportation is implemented between blasting and finishing apparatus, then productivity is improved, but system complexity increases
Solution Approach 1:
The invention merges the blasting and finishing operations into an integrated automated system where the workpiece is automatically transported between apparatuses. This combination eliminates manual handling, ensures consistent positioning, and maintains process continuity, thereby improving productivity despite the increased system integration requirements.
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 process effectively reduces or eliminates radiused tips, enhancing the operational characteristics and noise performance of gear teeth by improving surface finish and compressive strength.
Implementation Method 1
a stream of the air/media mixture is directed against the workpiece
Implementation Method 2
the blasting system is actuated, whereby media are mixed with air... This process is referred to as peening
Implementation Method 3
subjecting the workpiece to a finishing process with a second media... to reduce radiused tips on the workpiece created from the media blasting
Data Source
AI summary
A method and apparatus for processing a metallic workpiece with defined edges (e.g., a gear) comprises media blasting of the workpiece by directing a first media against exposed surfaces on the workpiece to increase the root strength of the gear, the blasting causing the defined edges to be radiused or mushroomed, ceasing the media blasting, loading the workpiece into a finishing apparatus, and subjecting the workpiece to a finishing process with a second media, the exposed surfaces on the workpiece being subjected to the finishing process to reduce the radiused edges on the workpiece created from the media blasting. The process of moving the workpiece to the spindle-finishing apparatus from the media blasting may be performed automatically by a machine. Once the workpiece has been subjected to the finishing process with the second media, it may be removed from the spindle-finishing machine, washed, and rinsed with rust inhibitor whereby wear properties of the workpiece are enhanced.