Gear Toothing Back Taper Tool With Thickened Shaft Rigidity
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Solution Overview
Problem
Existing methods for creating back tapers in gear toothings often result in impermissible shaping deviations due to tool bending, particularly when machining wide workpieces, requiring specialized cutting inserts or machine tool adjustments.
Innovation Solution
A tool with a thickened shaft design that increases in diameter from the cutting blade fastening position towards the fastening section, enhancing rigidity and preventing bending deformations, allowing for precise back taper creation without specialized cutting inserts or machine tool changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a slim tool shaft is used to reach wide workpieces, then the tool can access the machining area, but the tool shaft bends under transverse loads causing shaping deviations
Solution Approach 1:
The tool shaft is designed with varying diameter along its length, being thinner at the free end for accessibility and thicker near the fastening section for rigidity. This non-uniform cross-section provides local stiffness where needed while maintaining overall length for wide workpiece machining.
Solution Approach 2:
Instead of increasing the diameter uniformly along the entire tool shaft length, the invention increases the diameter only in the region close to the fastening section. This targeted dimensional change provides rigidity support at the critical location while preserving tool accessibility at the working end.
2Strength
If the tool shaft diameter is increased to prevent bending, then rigidity improves, but the tool complexity and mass increase
Solution Approach 1:
The tool shaft features a localized diameter increase only in the region close to the fastening section rather than being uniformly thick throughout. This creates a simple geometric modification that provides enhanced rigidity where it is most needed to prevent bending, while keeping the rest of the tool shaft slender for accessibility.
3Manufacturing precision
If specially shaped cutting blades are used to compensate for tool shaft bending, then shaping precision can be maintained, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of using complex cutting blades to compensate for bending that occurs during machining, the invention preemptively designs the tool shaft with a diameter increase near the fastening section. This preliminary structural adjustment prevents bending deformations before they occur during the machining process, eliminating the need for specially shaped cutting blades.
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 ensures optimal precision and prevents load-induced deformations, enabling precise back taper creation on both internal and external gear toothings without complex tool shaping or elaborate machine control, while allowing conventional cutting blades to be used.
Implementation Method 1
the diameter of the tool shaft measured in a plane oriented normal to the tool axis of rotation increases starting from the diameter, which the tool shaft has at the fastening position of the cutting blade, in a direction towards the fastening section
Data Source
AI summary
The present invention relates to a tool and a method for creating back tapers at an internal or external toothing of a gear. The tool rotates during use about a tool axis of rotation includes a tool shaft extending along the tool axis of rotation, a fastening section for fastening the tool to a tool drive of a machine tool, the fastening section formed at an end of the tool shaft, and at least one cutting blade, which is arranged at a fastening position provided at the circumference of the tool shaft. The tool according to the invention and the method according to the invention enable with simple means the creation of geometrically precisely shaped back tapers at toothings without the need for the use of specially shaped cutting inserts or a change of machine tools proven in practice for the creation of back tapers. This is achieved according to the invention in that the diameter of the tool shaft measured in a plane oriented normal to the tool axis of rotation increases starting from the diameter, which the tool shaft has at the fastening position of the cutting blade, in a direction directed towards the fastening section.