Threaded Damper Shank for Cutting Tool Vibration Control
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Solution Overview
Problem
Existing cutting tools face challenges in reducing vibration during operations due to the high cost and complexity of deep-hole drilling for damper insertion, which compromises the shank's strength and requires expensive Mn—Cu alloys for effective damping.
Innovation Solution
A cutting tool design featuring a shank with a pocket and a thread on its wall, where a damper with a matching thread is inserted, allowing for a controlled gap between the threads to absorb vibrations effectively, using a one-piece or three-piece configuration with elastic elements to restrict movement and enhance damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deep hole is made in the shank for damper insertion, then vibration damping is improved, but the shank strength is compromised and manufacturing cost increases
Solution Approach 1:
The invention extracts the damper from the traditional deep-hole configuration and relocates it to a pocket structure on the shank's outer surface. This allows the damper to be positioned away from the shank's core structural path, maintaining shank strength while achieving vibration damping through the damper's interaction with the pocket walls.
Solution Approach 2:
The invention transitions from a longitudinal deep-hole configuration to a lateral pocket configuration. By moving the damper placement from the shank's interior depth to its exterior surface, the solution addresses vibration damping in a different spatial dimension, preserving the shank's structural integrity.
2Reliability
If a deep hole is made in the shank for damper insertion, then vibration damping is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The invention extracts the damper placement from the complex deep-hole drilling process and relocates it to a simpler pocket structure that can be formed through conventional machining operations, significantly reducing manufacturing complexity and cost.
Solution Approach 2:
The invention employs a simple pocket structure with a cover that can be easily manufactured and assembled, replacing the expensive and complex deep-hole drilling process. The pocket and cover configuration allows for simpler, more economical manufacturing while achieving the same vibration damping function.
3Reliability
If Mn—Cu alloy damping material is used, then vibration damping performance is improved, but material cost and fabrication difficulty increase
Solution Approach 1:
The invention changes the material parameter from expensive Mn—Cu alloy to ordinary steel by modifying the damping mechanism. Instead of relying on the material's inherent damping properties, the solution uses the steel damper's inertial movement within the pocket to achieve vibration reduction, making the material selection more economical and fabrication easier.
Solution Approach 2:
The invention replaces the expensive Mn—Cu alloy damping material with ordinary steel that can be easily fabricated. The cost-effectiveness is achieved not through material properties but through the mechanical damping mechanism created by the damper's movement within the pocket structure.
4Reliability
If a gap is made between the damper and pocket wall, then vibration damping is improved through inertial movement, but controlling the gap within appropriate range becomes difficult
Solution Approach 1:
The invention provides beforehand cushioning for the gap control issue by using the threaded engagement between damper and pocket. The thread structure allows for controlled movement and maintains an appropriate gap without requiring high manufacturing precision, as the threading itself accommodates minor variations and ensures proper positioning.
Solution Approach 2:
The invention introduces a thread structure as an intermediary mechanism between the damper and pocket wall. This threading arrangement mediates the gap control issue by providing a controlled engagement that allows inertial movement for damping while maintaining appropriate spacing, eliminating the need for precise gap control through traditional machining.
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 design provides an inexpensive and effective vibration reduction solution by dispersing forces perpendicular to the thread interfaces, ensuring proper damper operation within the shank, thereby improving cutting precision and reducing operational costs.
Implementation Method 1
Friction between the shank and the damper reduces the vibration
Implementation Method 2
with a small gap defined between the threads
Data Source
AI summary
A cutting tool includes a blade, a seat, a shank and a damper. The blade is connected to the seat. The seat is connected to the shank. The shank includes a pocket defined therein and a thread formed on the wall of the pocket. A damper is inserted in the pocket. The damper includes a thread formed on the periphery for engagement with the thread of the shank, with a small gap defined between the threads.