Burnishing Tool Linear Slide-Contact for Reduced Machining Load

Solution Overview

Problem

Conventional burnishing tools face limitations in achieving high sealing performance due to rough surfaces and require high machining loads, making them unsuitable for workpieces beyond soft materials like aluminum.

Innovation Solution

A burnishing tool with a linear slide-contact portion that applies a relatively small pressing load, utilizing a load control mechanism with an elastic urging member to reduce machining pressure and enhance tip strength, allowing for the machining of harder materials like steel and alloys.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a flat and circular press portion is used for burnishing, then the surface finish quality is improved, but the machining load becomes excessively large

Engineering Contradiction:

Improvesurface finish qualityVSAvoidmachining load

Core Design Contradiction:

Manufacturing precisionVSForce

Solution Approach 1:

The press portion is designed with a curved surface that contacts the workpiece at a linear region rather than a broad flat surface. This concentrates the burnishing action to a specific linear contact zone, achieving effective surface finishing while reducing the overall contact area and thus the total machining load.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The press portion features a curved surface with a predetermined radius of curvature, which creates a linear contact region when pressed against the workpiece. This curvature geometry transforms the contact from a broad flat area to a focused linear zone, reducing pressure distribution and machining load while maintaining burnishing effectiveness.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Strength

If the press portion tip is strengthened to endure large loads, then the tool can machine harder materials, but the tip becomes difficult to strengthen further with conventional designs

Engineering Contradiction:

Improvetip strengthVSAvoidtip design flexibility

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The curved surface of the press portion with predetermined radius of curvature creates a linear contact region that reduces stress concentration at the tip. This geometric design allows the tip to withstand machining loads on harder materials without requiring excessive tip strength, enabling further strengthening while maintaining manufacturability.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Area of stationary object

If surface contact with large contact area is used, then burnishing coverage is improved, but the pressing load becomes excessively large

Engineering Contradiction:

Improvecontact areaVSAvoidpressing load

Core Design Contradiction:

Area of stationary objectVSForce

Solution Approach 1:

The press portion is designed with a curved surface that contacts the workpiece at a linear region rather than a broad flat surface. This concentrates the burnishing action to a specific linear contact zone, achieving effective surface finishing while reducing the overall contact area and thus the total machining load.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The press portion features a curved surface with a predetermined radius of curvature, which creates a linear contact region when pressed against the workpiece. This curvature geometry transforms the contact from a broad flat area to a focused linear zone, reducing pressure distribution and machining load while maintaining burnishing effectiveness.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 achieves a smoother surface finish with higher sealing performance and increased strength of the workpiece, capable of machining harder materials with reduced unmachined areas and lower operational loads.

Implementation Method 1

a load control mechanism having an elastic urging member that urges the tip portion

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

This causes plastic deformation at the surface, which is thus finished into a smooth surface like a mirror surface

Methodology Applied

Scientific EffectPlastic deformation: Plasticity

Data Source

PatentUS11154962B2Burnishing tool

Publication Date: 2021.10.26 SUGINO MACHINE

AI summary

A burnishing tool uses a relatively small pressing load in burnishing. The burnishing tool for machining a target surface of a workpiece includes a base and a tip portion located on a distal end of the base. The tip portion includes a linear slide-contact portion that linearly contacts and slides on the target surface.