Cutting Tool Insert Holder With Conical Clearance Surface

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Solution Overview

Problem

Existing cutting tools for milling, particularly in difficult roughing machining like turbine blade machining, face challenges in achieving high stability of the insert seat, efficient heat dissipation, and ease of indexing due to manufacturing tolerances and potential chip or dirt penetration.

Innovation Solution

The cutting tool design features a holder member with a conical clearance surface and a curved portion where the first distance between the insert's center and its lower portion is less than the distance to the holder member's center, allowing for a gap between the holder wall and insert, enabling efficient heat dissipation and preventing chip penetration, while the upper part of the holder wall forms a tight abutment with the insert's clearance surface for enhanced stability and indexing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the insert and holder member are designed with tight fitting lower portions, then manufacturing precision is improved, but manufacturing cost and complexity increase due to stricter tolerance requirements

Engineering Contradiction:

Improvefit precision of lower portionsVSAvoidmanufacturing tolerance

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The invention extracts the fitting function from the lower portions by introducing a gap between them, eliminating the need for tight tolerances in these areas. The lower portions are deliberately designed not to contact each other, removing the manufacturing precision requirement for this region while maintaining overall assembly precision through other means.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of designing the lower portions to contact and fit tightly, the invention inverts the approach by designing them to have a gap. The precision requirement is inverted from the lower portions to the conical clearance surface and curved portion, which are designed to contact and provide the necessary positioning and stability.

Inventive Principle:

Principle #13The other way round (Inversion)

2Temperature

If the holder wall and insert are designed with tight contact, then heat dissipation is improved, but chip or dirt penetration between contact surfaces becomes a problem

Engineering Contradiction:

Improveheat dissipation efficiencyVSAvoidchip or dirt penetration

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The invention segments the contact surfaces into two distinct regions: the lower portions with a gap that prevents chip and dirt penetration, and the conical clearance surface with curved portion that provides tight contact for heat dissipation. This segmentation allows each region to fulfill its specific function without the compromises required by a single unified contact surface.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the holder-insert interface are given different qualities: the lower portions have a gap for contamination prevention, while the conical clearance surface and curved portion have tight contact for thermal conduction. This local differentiation of contact properties optimizes both heat dissipation and contamination resistance simultaneously.

Inventive Principle:

Principle #3Local quality

3Measurement precision

If the lower portions are designed to contact tightly, then indexing precision is improved, but manufacturing complexity and tolerance requirements increase

Engineering Contradiction:

Improveindexing precisionVSAvoidmanufacturing tolerance control

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The indexing function is extracted from the lower portions and assigned to the conical clearance surface and curved portion. By removing the indexing responsibility from the lower portions, the design simplifies manufacturing tolerances in those areas while maintaining indexing precision through the dedicated conical and curved contact surfaces.

Inventive Principle:

Principle #2Taking out (Extraction)

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 design ensures a perfect fit with larger manufacturing tolerances, efficient heat dissipation, and reliable indexing by preventing chip or dirt penetration, thereby improving the stability and heat dissipation of the insert seat in the holder member.

Implementation Method 1

a curved portion of the upstanding holder wall laterally supporting said conical clearance surface

Methodology Applied

Scientific EffectMechanical support: Mechanical Force

Implementation Method 2

tight abutment of said upper part of the insert to said upper part of the holder member over the entire circumferential extension of said upstanding holder wall... efficient heat dissipation from insert to holder

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentEP2424700B1Cutting tool

Publication Date: 2019.06.12 SECO TOOLS AB

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AI summary

A cutting tool has an indexable insert (1), a holder with a holder member (20) and means (14) for securing the insert to the holder. An upstanding holder wall and a conical insert clearance surface are designed so as to enable securing of the insert to the holder in a finite number of fixed relative positions. A curved portion of the upstanding holder wall supports said conical clearance surface laterally in each said fixed relative position of the holder and the insert. A tight abutment of said conical clearance surface on said curved portion is provided to dirt from penetrating there between.