Embedded Damped Turning Tool Holder for Deep Cavity Vibration
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Solution Overview
Problem
Existing turning tool holders for deep cavities and deep holes suffer from strong cutting vibrations due to reduced stiffness, affecting cutting efficiency and tool life, and current vibration attenuation methods are complex, costly, or compromise tool strength and stability.
Innovation Solution
An embedded damping vibration attenuation turning tool holder with a blocky damper in interference fit, utilizing a mass block, elastic member, and piezoelectric ceramic to absorb vibrations and convert them into electric energy, with adjustable spring rod overhang for effective damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If large-overhang tools are used for deep cavity machining, then the tool can reach deep holes and cavities, but the equivalent stiffness of the tool is reduced and strong cutting vibration is caused
Solution Approach 1:
A passive vibration attenuation device is introduced as an intermediary component between the tool holder and the cutting tool. This device includes a mass block, elastic member, and damping material arranged in a specific structure that absorbs and dissipates vibration energy, thereby protecting the tool system from excessive vibrations while maintaining the required tool overhang length for deep cavity machining
2Reliability
If active vibration attenuation with feedback control system is used, then vibration response can be controlled and kept stable, but the structure becomes complex and production cost increases
Solution Approach 1:
The vibration attenuation device operates passively without requiring external power sources or control systems. The mass block and elastic member automatically respond to vibrations through mechanical coupling, while the damping material dissipates energy through material hysteresis. This self-service mechanism achieves reliable vibration attenuation without the complexity of feedback control systems
Solution Approach 2:
The patent replaces the complex electronic feedback control system with a purely mechanical passive vibration attenuation mechanism. The mechanical components (mass block, elastic member, damping material) directly interact with tool vibrations through physical coupling, eliminating the need for sensors, controllers, and power systems while maintaining effective vibration control
3Object-affected harmful factors
If surface damping layer is covered on the tool holder, then vibration attenuation is achieved, but design technology requirements and manufacturing cost increase
Solution Approach 1:
Instead of applying a damping layer to the entire tool holder surface, the vibration attenuation function is segmented into a discrete, localized device mounted at the critical vibration node. This segmented approach uses only the necessary components (mass block, elastic member, damping material) in a concentrated configuration, reducing material costs and simplifying manufacturing while maintaining effective vibration attenuation at the most critical locations
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 tool holder provides stable, high-rigidity, fast-response vibration attenuation, enhancing machining performance and reducing manufacturing costs, suitable for industries like aviation and aerospace.
Implementation Method 1
the piezoelectric ceramic is used for generating interaction with the inner wall of the square cavity under a vibration action of the tool holder, so as to absorb the vibration to generate electric energy
Implementation Method 2
the elastic member is arranged between the piezoelectric ceramic and the mass block
Implementation Method 3
the damper is in interference fit in the square cavity
Data Source
AI summary
An embedded damping vibration attenuation turning tool holder for deep cavity machining and a method includes a tool holder and a damper; one end of the tool holder is connected with a turning blade; a side surface of the tool holder is provided with a square cavity; the damper is in interference fit in the square cavity; the damper includes a mass block, an elastic member and piezoelectric ceramic; at least one surface of the mass block that is in contact with an inner wall of the square cavity is connected with the piezoelectric ceramic; the elastic member is arranged between the piezoelectric ceramic and the mass block; and the piezoelectric ceramic is used for generating interaction with the inner wall of the square cavity under a vibration action of the tool holder, so as to absorb the vibration to generate electric energy.