Tool Spindle Tuned Mass Damping for B-Axis Cutting Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-tasking machine tools with B axis rotatable tool spindles experience vibration due to low stiffness in the rotating mechanism, which deteriorates cutting performance.
Innovation Solution
A vibration damping device is integrated into the tool spindle, comprising a rigid member with stiffness rods and a tuned mass member, along with an additional mass member and viscous fluid, to dampen cutting vibrations and adjust the natural frequency of the spindle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotating mechanism with a B axis indexing device is used to enable the tool spindle to rotate, then the tool spindle can be installed to be rotatable for multi-tasking operations, but the low stiffness structure of the rotating mechanism causes vibration in the front end of the tool spindle, deteriorating cutting performance
Solution Approach 1:
The patent applies vibration damping technology by installing a vibration damping device at the rear end of the tool spindle. This device generates counter-vibration to cancel out the harmful vibrations caused by the low-stiffness rotating mechanism, thereby reducing vibration in the front end of the tool spindle while maintaining the B-axis rotation capability for multi-tasking operations.
Solution Approach 2:
The patent changes the natural frequency parameter of the tool spindle system by adding the vibration damping device. By adjusting the natural frequency to be different from the cutting frequency region, the system reduces resonance and vibration effects, improving cutting performance while preserving the rotational adaptability of the spindle.
2Speed
If the rotating mechanism is designed with lower stiffness to allow rotation, then the tool spindle can rotate about B axis for 5-axis machining, but vibration occurs in the front end of the tool spindle, reducing cutting ability
Solution Approach 1:
The vibration damping device acts as an intermediary element between the rotating mechanism and the tool spindle front end. It absorbs and dampens the vibrations generated during rotation, allowing the tool spindle to maintain rotation speed for 5-axis machining while reducing the harmful vibration effects at the cutting end.
3Object-affected harmful factors
If a vibration damping device is added to the rear end of the tool spindle, then vibration damping ability in the cutting frequency region is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the vibration damping function as a separate, dedicated device installed at the rear end of the tool spindle. This modular approach allows the vibration damping capability to be added without fundamentally redesigning the entire rotating mechanism, thereby improving vibration damping ability while limiting the increase in overall device complexity.
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 vibration damping device significantly reduces vibrations at the tool spindle's front end, enhancing dynamic stiffness and cutting ability by increasing the spindle's vibration damping capacity in the cutting frequency region.
Implementation Method 1
a vibration damping device mounted in a rear end of the tool spindle to damp cutting vibration generated at the front end of the tool spindle, and including a rigid member coupled to the rear end of the tool spindle and a tuned mass member elastically supported by the rigid member
Implementation Method 2
the vibration damping device may include a viscous fluid which fills at least partially the receiving recess
Data Source
AI summary
A tool spindle for machine tool includes a tool spindle having a front end in which a tool is mounted and installed to be rotatable, and a vibration damping device mounted in a rear end of the tool spindle to damp cutting vibration generated at the front end of the tool spindle, and including a rigid member coupled to the rear end of the tool spindle and a tuned mass member elastically supported by the rigid member.