Conjugate Bevel Honing Tool Geometry for Precise Gear Finishing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hard finishing methods for bevel and hypoid gears, such as lapping and skiving, are inefficient and lack precision, while existing honing processes face challenges in defining conjugate honing tools and achieving consistent flank surface formation, leading to tool coating issues and premature failure.
Innovation Solution
A method involving two transformation steps based on theoretical generating gear settings to produce honing tools that are conjugate to bevel pinions and ring gears, using standard bevel gear free form machines, with cutting machine setup parameters and abrasive coating applied to the honing tool blanks to achieve precise tooth formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hard finishing methods (lapping and skiving) are used, then the process is simple to implement, but the efficiency and precision are insufficient
Solution Approach 1:
The patent replaces conventional mechanical hard finishing methods (lapping and skiving) with a honing process that uses abrasive coating on specially designed toothed tools. This substitution enables more precise material removal with better surface finish while maintaining high productivity through continuous indexing face hobbing technology.
Solution Approach 2:
The invention changes the fundamental parameters of the finishing process by using abrasive particles with specific grit sizes (e.g., 0.050 mm CBN) coated on the tool teeth, combined with controlled sliding velocities (5-10 m/s) and specific honing machine settings. These parameter changes enable simultaneous achievement of high precision and efficiency.
2Reliability
If existing honing processes are used, then tool coating is applied to achieve hard finishing, but the conjugate relationship between tool and workpiece is difficult to define leading to premature tool failure
Solution Approach 1:
The patent creates a conjugate honing tool by copying the theoretical crown gear geometry. The tool teeth are formed to precisely match the complementary shape of the workpiece tooth flanks, ensuring proper contact and load distribution. This copying approach from theoretical generating gear settings eliminates the conjugacy definition problems of existing methods.
Solution Approach 2:
The invention performs preliminary action by pre-defining the exact conjugate relationship between tool and workpiece through theoretical generating gear calculations before actual honing. The basic machine settings (radial distance S, tilt angle Pi, swivel angle Pj, cradle angle q, root angle Σ, sliding base Xb, head setting Xp) are predetermined to ensure proper tool geometry and positioning, preventing premature tool failure.
3Manufacturing precision
If conventional face mill or face hob cutters are used, then the cutting process is efficient, but the tools cannot achieve proper conjugate relationship for hard finishing
Solution Approach 1:
The patent segments the tool design into distinct functional components: the toothed body structure that engages with the workpiece, and the abrasive coating layer that performs the hard finishing. This segmentation allows the underlying tool geometry to be designed for proper conjugate relationship while the abrasive coating provides the finishing function, resolving the conflict between precision and complexity.
Solution Approach 2:
The invention uses composite material structure by combining a hardened tool body (capable of withstanding high stresses) with an abrasive coating layer (CBN or silicon carbide particles embedded in a binder). This composite structure enables the tool to maintain precise conjugate geometry while performing efficient hard finishing, overcoming the limitations of conventional single-material tools.
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 method enables the production of honing tools that are precisely conjugate to the gears they hone, improving surface finish and tool longevity, allowing for efficient and precise hard finishing of bevel and hypoid gears, enabling closed-loop online manufacturing.
Implementation Method 1
An abrasive coating is applied to the teeth of the toothed bevel honing tool blank to produce a toothed bevel honing tool
Data Source
AI summary
A method for producing honing tools (24) that are conjugate to the bevel pinions and ring gears (26) they are intended to hone and which can be produced (e.g. cut) on a standard bevel gear free form machine. The method is described by two transformation steps with the basis of the transformations being the theoretical generating gear. The invention relates also to a toothed bevel honing tool produced by such a method and a method of honing bevel gears when provided with such a tool produced by such a method.