Damped Tool Body Sealing Without O-Ring Assembly

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Solution Overview

Problem

Existing machining tool bodies with damping apparatuses require manual assembly of O-rings for sealing, leading to potential non-tight seals and increased production costs.

Innovation Solution

The tool body incorporates disc-like members with central holes and axially extending socket-like portions that compress onto the damper mass body and tool body fixed parts, eliminating the need for O-rings and ensuring a reliable, automatic sealing of the cavity without manual work.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If O-rings are manually fitted for sealing the cavity, then the sealing function is provided, but the production cost increases and the reliability of the seal is compromised

Engineering Contradiction:

Improvesealing reliabilityVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The elastic element performs dual function: damping vibrations and sealing the cavity. The socket-like portions of the elastic element automatically seal against the damping body and tool body fixed part when compressed during assembly, eliminating the need for separate sealing components and manual sealing operations.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The sealing function is merged with the damping function by integrating the sealing action into the elastic element itself. The socket-like portions of the elastic element serve both as structural components for vibration damping and as sealing elements, combining two functions into one component.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If O-rings are manually fitted for sealing, then sealing is provided, but the assembly process requires manual work increasing production time

Engineering Contradiction:

Improvesealing reliabilityVSAvoidassembly speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The separate sealing components (O-rings) and manual sealing operations are extracted from the assembly process. The sealing function is extracted and integrated into the elastic element itself, which automatically provides sealing when compressed, eliminating the need for separate sealing steps.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If O-rings are used for sealing, then sealing is provided, but the seal is positioned at a distance from the central tube reducing sealing efficiency

Engineering Contradiction:

Improvesealing efficiencyVSAvoiddistance from central tube

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The sealing action is moved from a radial sealing approach (O-rings in grooves) to an axial sealing approach. The socket-like portions of the elastic element seal axially against the damping body and tool body fixed part, allowing the seal to be positioned closer to the central tube and improving sealing efficiency.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 solution reduces production costs and provides a more reliable sealing action closer to the cavity, enhancing the sealing efficiency and assembly process of the damping apparatus.

Implementation Method 1

each elastic element being provided with two socket-like portions extending axially through the central hole of each disc-like member, and wherein the socket-like portions project, in a rest state of the elastic element, axially beyond the respective said axially directed side of the respective disc-like member and which portions are when in an assembled state compressed by bearing under pretention onto the damper mass body and the tool body fixed part, respectively

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

The damping effect of the damping apparatus is a result of an interaction between the damping body, which is of high density material, such as lead, and the elastic element

Methodology Applied

Scientific EffectVibration damping: Damping

Implementation Method 3

The elastic element is in this known tool mainly exposed to shear forces

Methodology Applied

Scientific EffectShear force: Shear Stress

Data Source

PatentUS11583937B2Tool body including a damping apparatus and a machining tool having such a tool body

Publication Date: 2023.02.21 SANDVIK INTELLECTUAL PROPERTY AB

AI summary

A tool body includes a damping apparatus having a damper mass body with an axial through bore and a central tube received in the through bore and surrounded by a cavity. An elastic element is arranged on each side of the damper mass body and provided with two socket-like portions extending axially through a central hole of two disc-like members clamping the elastic element therebetween. The socket-like portions project in a rest state of the elastic element extend axially beyond the respective axially directed side of the respective disc-like member and are in an assembled state of the tool body compressed for sealing the cavity with respect to the exterior.