Wood Cutting Tool Inserts for Scoring and Smoother Profiling

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Solution Overview

Problem

Wood cutting tools experience high tool failure rates due to extreme abuse and shock in industrial applications, leading to rapid deterioration and increased maintenance costs, with existing solutions failing to provide consistent chip quality and smooth cutting surfaces.

Innovation Solution

A cutting tool design featuring interchangeable inserts with angled and curved cutting edges, where second cutting inserts perform a scoring operation to facilitate material removal by first cutting inserts, reducing force variations and extending tool life, while also providing a compact attachment mechanism to minimize interference and optimize chip quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional wood cutting tools are used with standard cutting inserts, then the tool structure is simple, but the tool failure rate is high and tool life is short due to extreme abuse and shock in industrial applications

Engineering Contradiction:
Improvetool failure rateVSAvoidtool life
Core Design Contradiction:
ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The cutting tool is divided into multiple functional segments: side cutting inserts with scoring edges that extend beyond the peripheral cutting inserts' radius, and peripheral cutting inserts for main material removal. This segmentation allows each insert type to perform its specific function optimally, reducing overall tool failure rate while extending tool life through specialized design for each segment's role.

Inventive Principle:
Principle #1Segmentation

2Productivity

If peripheral cutting inserts are used for main material removal, then productivity is high, but cutting forces vary significantly causing tool deterioration

Engineering Contradiction:
Improvematerial removal rateVSAvoidcutting force variation
Core Design Contradiction:
ProductivityVSForce

Solution Approach 1:

The side cutting inserts perform a preliminary scoring action by extending radially beyond the peripheral cutting inserts. This pre-scores the wood material, creating a controlled separation line that reduces the force required by peripheral inserts and minimizes force variations during main material removal, thereby reducing tool deterioration while maintaining high productivity.

Inventive Principle:
Principle #10Preliminary action

3Manufacturing precision

If standard cutting geometry is used, then device complexity is low, but chip quality is inconsistent and cutting surfaces are rough

Engineering Contradiction:
Improvechip quality consistencyVSAvoidcutting tool structure
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The cutting tool employs different insert types with specialized geometries positioned at specific locations: side cutting inserts with scoring edges for preliminary separation and peripheral cutting inserts for finishing cuts. Each insert type has optimized geometry for its specific function, achieving consistent chip quality and smooth cutting surfaces through localized functional specialization rather than uniform design.

Inventive Principle:
Principle #3Local quality

4Manufacturing precision

If frequent tool replacement is performed to maintain cutting quality, then manufacturing precision is maintained, but loss of time increases due to frequent replacement

Engineering Contradiction:
Improvecutting qualityVSAvoidtool replacement time
Core Design Contradiction:
Manufacturing precisionVSLoss of time

Solution Approach 1:

The cutting tool uses interchangeable cutting inserts that can be dynamically replaced or repositioned on the tool body. When one insert becomes dull, operators can quickly swap it with a fresh insert from the same tool, eliminating the need for complete tool replacement. This dynamic insert system maintains cutting quality while minimizing downtime, as only small insert components need replacement rather than entire tools.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentEP3471933B1Wood cutting tool and an arrangement for using said tool
Publication Date: 2021.07.28 KVARNSTRANDS VERKTYG
  • EP3471933B1 patent drawingFigure 1
  • EP3471933B1 patent drawingFigure 2A
  • EP3471933B1 patent drawingFigure 2B

AI summary

The invention relates to a cutting tool arranged to be mounted on a shaft for rotation about an axis, the cutting tool comprising a body (101) having at least two first cutting inserts (111) mounted with equal spacing at the outer periphery of the body (101), which first cutting inserts (111) have a cutting edge (121) extending at least across the width of the body (101) at a predetermined peripheral radius from the axis; and at least two second cutting inserts (112, 113) mounted with equal spacing adjacent the outer periphery on a first side surface of the body (101), which second cutting inserts (112, 113) have a cutting edge (122, 123) extending at least partially in an axial plane at right angles to the axis. The cutting edge (121) of each first cutting insert (111) is arranged to extend up to, or be terminated a predetermined distance from the axial plane of the second cutting inserts (112, 113); and the cutting edge (122, 123) of at least each second cutting insert (112, 113) preceding a first cutting insert (111) is arranged to extend a predetermined radial distance outside the peripheral radius of the cutting edges (121) of the first cutting inserts (111). The invention further relates to an apparatus for profiling an elongated timber product, which apparatus comprises cutting tools according to the invention.