Screw-in Tool Double Cone Supporting Region Centering

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Solution Overview

Problem

Existing screw-in tools face challenges in achieving precise axial positioning and centering due to limitations in supporting regions, such as radial or conical bearing faces, which can lead to deformation and misalignment in tool holders.

Innovation Solution

The screw-in tool and tool holder employ a double cone supporting region with conical bearing faces of different angles, providing an enlarged contact surface for improved centering and reduced spreading forces, along with additional spherical or cylindrical supporting regions for independent pretension, and adaptable threaded inserts for secure locking and vibration dampening.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a conical bearing face is used to improve centering effect, then centering is improved, but the outer wall of the tool holder deforms due to wedge effect

Engineering Contradiction:

Improvecentering precisionVSAvoidtool holder deformation

Core Design Contradiction:

Manufacturing precisionVSStability of the object's composition

Solution Approach 1:

The single conical bearing face is segmented into two conical bearing faces with different cone angles (first conical bearing face with smaller angle, second conical bearing face with larger angle). This segmentation allows the first cone to provide centering while the second cone with its geometry redirects forces to reduce wedge effect on the tool holder outer wall.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the supporting structure are given different geometric properties - the first conical bearing face has a smaller cone angle optimized for centering, while the second conical bearing face has a larger cone angle optimized for force distribution. This local differentiation of geometric quality resolves the contradiction between centering precision and structural stability.

Inventive Principle:

Principle #3Local quality

2Reliability

If thread pretension is increased for secure locking, then locking reliability is improved, but spreading forces increase causing tool holder deformation

Engineering Contradiction:

Improvelocking reliabilityVSAvoidtool holder deformation

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The invention converts the harmful wedge effect and spreading forces into a beneficial force distribution pattern. The second conical bearing face with its specific geometry redirects the thread pretension forces, transforming the harmful radial spreading forces into axial compression forces that are beneficial for locking while minimizing deformation of the tool holder.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

By changing the geometric parameters of the supporting region (introducing two different cone angles instead of one), the force distribution parameters are optimized. This allows high thread pretension for reliable locking while the specific cone angles control the direction and magnitude of spreading forces, minimizing tool holder deformation.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9802256B2Screw-in tool and tool holder for such a screw-in tool

Publication Date: 2017.10.31 FRANZ HAIMER MASCHINENBAU KG

AI summary

A screw-in tool and a tool holder for such a screw-in tool. The screw-in tool contains a tool head and a tool shank having an outer thread and a supporting region arranged between the tool head and the outer thread. The supporting region is formed by two conical bearing faces having different cone angles.