Involute Gear Form Rolling with Optimized Addendum Pitch
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Solution Overview
Problem
Conventional form rolling methods for involute gears face issues with precision and mechanical characteristics due to unstable indentation positions and excessive plastic deformation, leading to increased manufacturing complexity and costs.
Innovation Solution
A form rolling method that optimizes the contact between a round die and a work piece by using an addendum pitch corresponding to the number of teeth, with a second pressure angle greater than the first, ensuring precise indentation formation and reduced plastic deformation, thereby enhancing mechanical characteristics and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional form rolling method is used with standard addendum pitch, then the gear can be formed with basic tooth profile, but the indentation positions become unstable and manufacturing precision deteriorates
Solution Approach 1:
The patent changes the addendum pitch parameter from the conventional value to a specific optimized value that corresponds to the number of teeth of the gear to be formed. This parameter change stabilizes the indentation positions during form rolling, improving manufacturing precision without requiring complex device modifications
Solution Approach 2:
The die design incorporates preliminary considerations for the number of teeth and addendum pitch relationship before the actual form rolling process. By pre-calculating and setting the appropriate addendum pitch based on the target gear's tooth count, the method ensures stable indentation formation from the outset, avoiding position instability
2Manufacturing precision
If excessive pressing force is applied to form the gear teeth, then the tooth profile can be formed completely, but plastic deformation becomes excessive and mechanical characteristics worsen
Solution Approach 1:
The patent optimizes the pressure angle parameter, setting the second pressure angle greater than the first pressure angle. This parameter optimization allows complete tooth profile formation while controlling plastic deformation, thereby maintaining or improving mechanical characteristics
Solution Approach 2:
The method applies pressing force in a controlled manner that is sufficient to form the tooth profile completely but not excessive. By optimizing the pressure angle and addendum pitch, the process achieves just enough deformation to create accurate tooth profiles without causing excessive plastic deformation that would harm mechanical properties
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 method achieves high-precision gear formation with improved mechanical characteristics and reduced manufacturing costs by stabilizing indentation positions and minimizing plastic deformation, applicable to both spur and helical gears.
Implementation Method 1
a blank of the work piece is bulged to form a tooth portion of the gear
Data Source
AI summary
A form rolling method for an involute gear, which includes a work piece including a cylindrical outer peripheral surface having a predetermined radius, and a round die with an involute tooth profile including an addendum pitch corresponding to a pitch defined by dividing a length of an outer circumference of the work piece by number of teeth of the involute gear. The round die is pressed to the work piece while rotating when form rolling the involuete gear.