Rotating Body Anti-Vibration Structure for Chatter Damping
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Solution Overview
Problem
Existing vibration damping devices for rotating bodies during cutting work are ineffective in damping large chatter vibrations due to the weight being separated from the cutting tool along the rotation axis.
Innovation Solution
A vibration-proof structure for rotating bodies featuring a weight disposed in a hollow within the body, held by elastic members, and a protrusion protruding toward a head member, allowing the weight to be positioned near the cutting tool for effective damping, with a coolant reservoir and flow path for smooth coolant supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the weight is disposed in a hollow in the rotating body as disclosed in Patent Literature 1, then the device structure is simple, but the weight is separated from the cutting tool along the rotation axis which prevents sufficient damping of large chatter vibrations
Solution Approach 1:
The patent extends the hollow space along the rotation axis into the head member, creating an axial extension that allows the weight to be positioned closer to the cutting tool. This dimensional extension in the axial direction resolves the contradiction by maintaining structural simplicity while improving vibration damping effectiveness through reduced separation distance.
Solution Approach 2:
The weight is nested within the extended hollow space that penetrates through the rotating body into the head member. This nesting arrangement allows the weight to be positioned strategically near the cutting tool while remaining contained within the structural hollow, achieving both simplicity and effectiveness.
2Reliability
If the weight is placed closer to the cutting tool to improve vibration damping, then the vibration damping effectiveness is improved, but the space for containing the weight becomes more constrained
Solution Approach 1:
The hollow space is segmented into two portions: one in the rotating body and one extended into the head member. This segmentation allows the weight to be positioned in the head member portion closer to the cutting tool, improving damping effectiveness while the total volume is distributed across both sections.
Solution Approach 2:
The hollow space is extended in the axial dimension from the rotating body into the head member. This axial extension provides additional containment volume near the cutting tool without requiring increased radial or lateral space, thus resolving the space constraint.
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 structure effectively damps vibrations near the cutting tool, improving machining accuracy by placing the weight closer to the cutting tool and enabling early vibration damping, while ensuring reliable attachment and smooth coolant supply.
Implementation Method 1
a plurality of elastic members holding the weight
Implementation Method 2
The weight absorbs energy of the chatter, so that the device increases the machining accuracy
Data Source
Figure 1
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AI summary
A vibration-proof structure for a rotating body (2) includes: a cylindrical rotating body (2) having a rotation axis (X) and including: an opening (7a) in an end along the rotation axis (X); and a hollow (7) continuous with the opening (7a) and extending along the rotation axis (X); a weight (12) in the hollow (7); a plurality of elastic members (24, 25) holding the weight (12); and a head member (4) connected to the rotating body (2) in such a manner as to close the opening (7a) and have an axis that coincides with the rotation axis (X), the opening (7a) and the hollow (7) each having a cross section in the shape of a circle with the rotation axis (X) as the center, the weight (12) having a columnar shape and an axis that coincides with the rotation axis (X), the head member (4) including a portion opposite to the rotating body (2) to which portion a cutting tool (5) is attachable, the weight (12) including a protrusion (13) protruding toward the head member (4) from the boundary (B) between the respective outer surface portions (21a, 41a) of the rotating body (2) and the head member (4).