Axial Machining Device Undulating Raceway Vibration
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Solution Overview
Problem
Existing axial machining devices, such as drilling devices, face issues with vibratory assistance leading to friction, noise, and suboptimal swarf fragmentation due to integer multiple frequency oscillations, and require larger, more complex designs to maintain axial vibration, especially when handling large aviation workpieces.
Innovation Solution
A compact axial machining device with a tool-carrier spindle and an integrated transmission system featuring a resilient return member and a rolling bearing with an undulating raceway, generating axial vibration at a frequency associated with the spindle's rotation speed, reducing friction and allowing non-integer oscillations per revolution for improved swarf fragmentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If cams without rolling members are used to generate oscillations, then the device structure is simplified, but friction increases generating heat and noise
Solution Approach 1:
A resilient return member acts as an intermediary between the cam and the tool-carrier spindle, introducing rolling members that mediate the contact interaction. This reduces direct friction between cam surfaces while maintaining the oscillation-generating function, thereby reducing heat and noise generation.
2Ease of operation
If the oscillation frequency is an integer multiple of the speed of rotation differential, then the mechanism is simpler to control, but swarf fragmentation quality deteriorates
Solution Approach 1:
The invention changes the oscillation frequency parameter from an integer multiple of the rotation speed differential to a non-integer multiple. This parameter modification improves swarf fragmentation quality by eliminating periodic clogging patterns, while the frequency remains directly related to the rotational speed for maintainability.
3Reliability
If a very stiff spring is used to prevent rolling members from ceasing to roll under high axial pressure, then axial vibration is maintained, but the bearing becomes overdimensioned increasing costs and size
Solution Approach 1:
The resilient return member is designed with dynamic characteristics that allow it to adapt its stiffness response to the operating conditions. Under normal conditions, it provides sufficient return force; under high axial pressure, its dynamic response maintains rolling motion without requiring excessive static stiffness, avoiding overdimensioning.
4Volume of moving object
If the device is fitted to the end of the spindle under the advance system, then the advance mechanism is compact, but overall device size and complexity increase
Solution Approach 1:
The oscillation-generating mechanism is merged with the existing advance system components (cam and resilient return member) rather than being added as a separate end-mounted device. This integration achieves compactness while avoiding additional complexity by reusing existing structural elements.
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 enables efficient and reliable axial machining with reduced friction, constant oscillations per revolution, and continued vibratory motion even under axial overload, while maintaining a compact and integrated design, effectively addressing the limitations of existing devices.
Implementation Method 1
a resilient return member urging the advance gearwheel in a first axial direction and a first rolling bearing having rolling members rolling on an undulating raceway
Implementation Method 2
a first rolling bearing having rolling members rolling on an undulating raceway having an undulation axial component
Data Source
AI summary
The present invention provides an axial machining device comprising a tool-carrier spindle rotatable in a housing, the housing housing a transmission system causing the spindle to advance automatically relative to the housing under the effect of the tool-carrier spindle being driven in rotation, the transmission system including an advance gearwheel screwed onto the spindle, the device including a resilient return member urging the advance gearwheel in a first axial direction opposite to the advance direction of the spindle, and also including a first rolling bearing having rolling members rolling on an undulating raceway having an axial component, thereby periodically urging the advance gearwheel to move in a second direction opposite to the first, such that rotation of the spindle is accompanied by axial vibratory motion.