Multiple-Thread Grinding Worm Dressing to Break Periodic Topography

Solution Overview

Problem

Existing methods for dressing multiple thread grinding worms result in periodic topography on gear flanks, leading to uneven running and noise during gear operation due to identical dressing parameters across all threads.

Innovation Solution

Dressing parameters such as rotational speeds and radial distances are varied between threads, allowing each thread to have distinct profiling, with the rotational speed ratio and radial overlap differing by at least 5-15% between threads, and the dressing tool's rotational speed and path speed being adjusted accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If identical dressing parameters are used for all threads of the grinding worm, then the manufacturing process is simple and efficient, but periodic topography is created on gear flanks causing uneven running and noise

Engineering Contradiction:

Improvedressing process efficiencyVSAvoidperiodic topography causing noise and uneven running

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by assigning different dressing parameters to different threads of the grinding worm. Specifically, the radial infeed, rotational speed, or path speed varies for each thread, creating locally different surface topographies that eliminate periodic patterns when the gear is ground by multiple threads.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements parameter changes by modifying dressing parameters such as radial infeed amount, rotational speed of the grinding worm or dressing tool, or path speed between threads. These parameter variations ensure that each thread produces a distinct surface profile, preventing the formation of periodic topography on gear flanks.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If different dressing parameters are used for each thread to eliminate periodicity, then gear running smoothness improves, but the dressing process complexity increases

Engineering Contradiction:

Improvegear running smoothnessVSAvoiddressing process complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent applies local quality by assigning different dressing parameters to different threads of the grinding worm. Specifically, the radial infeed, rotational speed, or path speed varies for each thread, creating locally different surface topographies that eliminate periodic patterns when the gear is ground by multiple threads.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements parameter changes by modifying dressing parameters such as radial infeed amount, rotational speed of the grinding worm or dressing tool, or path speed between threads. These parameter variations ensure that each thread produces a distinct surface profile, preventing the formation of periodic topography on gear flanks.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If different dressing parameters are used for each thread, then periodic topography is eliminated, but the setup and control complexity increases

Engineering Contradiction:

Improvesurface topography uniformityVSAvoidcontrol system complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies local quality by assigning different dressing parameters to different threads of the grinding worm. Specifically, the radial infeed, rotational speed, or path speed varies for each thread, creating locally different surface topographies that eliminate periodic patterns when the gear is ground by multiple threads.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements parameter changes by modifying dressing parameters such as radial infeed amount, rotational speed of the grinding worm or dressing tool, or path speed between threads. These parameter variations ensure that each thread produces a distinct surface profile, preventing the formation of periodic topography on gear flanks.

Inventive Principle:

Principle #35Parameter changes

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 approach eliminates periodicity in the abrasive surface topography, resulting in smoother gear operation and reduced noise by creating a more variable surface profile on the gear flanks without compromising productivity.

Implementation Method 1

the abrasive surfaces of the individual threads of the grinding worm are successively profiled with the dressing tool

Methodology Applied

Scientific EffectAbrasion: Abrasion

Data Source

PatentUS20230311223A1Method for dressing a multiple thread grinding worm

Publication Date: 2023.10.05 KAPP NILES GMBH & CO KG

AI summary

A method for dressing a multiple thread grinding worm by a dressing tool, in which the abrasive surfaces of the individual threads of the grinding worm are successively profiled with the dressing tool. The dressing is carried out in at least two threads with different dressing parameters so that the profiling of the abrasive surfaces of the threads differ from each other. The dressing parameters are selected so that the abrasive surfaces of at least two threads, viewed in the direction of the helix of the thread, differ from one another, and/or that the abrasive surfaces of the individual threads are profiled by topological dressing. A plurality of linear dressing strokes are performed over the height of the abrasive surface. The dressing tool is guided in the radial direction of the grinding worm at predetermined distances. The distances are constant in each thread but differing in at least two threads.