Tubular Tooth Part Rib Forming for Easier Length Cutting
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Solution Overview
Problem
The existing manufacturing methods for tooth parts, such as cup-shaped parts, face challenges in adjusting the axial length of the tubular portion without compromising rigidity, often resulting in chipping or requiring high loads during cutting due to the smooth outer peripheral surface.
Innovation Solution
A manufacturing method that forms an annular rib on the open end of the tubular portion by pushing out inner peripheral wall portions and tooth surface portions radially outward while shearing, maintaining rigidity and allowing easy adjustment of the axial length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a smooth outer peripheral portion is formed on the open end portion side of the cylindrical portion, then the strength of the cylindrical portion is improved, but the thickness of the open end portion is increased making cutting difficult
Solution Approach 1:
The open end portion is divided into two functional zones: a smooth outer peripheral portion for strength and an annular rib portion for ease of cutting. This segmentation allows each zone to serve its specific purpose without compromising the other.
Solution Approach 2:
Different regions of the open end portion are given different surface characteristics: the smooth outer peripheral portion maintains high strength while the annular rib portion provides a thin, easily cuttable edge. This local differentiation resolves the contradiction between strength and manufacturability.
2Adaptability or versatility
If the axial length of the tubular portion is reduced by cutting, then the adaptability is improved, but chipping occurs due to impact and friction of intermittent cutting
Solution Approach 1:
The annular rib is formed in advance at the open end portion, creating a pre-prepared thin-edged structure that is specifically designed to be easily cut. This preliminary action eliminates the need for complex cutting processes and prevents chipping during length adjustment.
3Adaptability or versatility
If plastic working is used to cut the open end portion, then the axial length can be adjusted, but a large load needs to be applied
Solution Approach 1:
The annular rib creates a localized thin-edged region that requires minimal force to cut, contrasting with the thicker main body of the cylindrical portion. This allows length adjustment with small loads while maintaining the overall structural integrity.
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 enhances the rigidity of the tooth part while enabling easy adjustment of the axial length, reducing material thickness and weight, and lowering production costs by simplifying the cutting process.
Implementation Method 1
pushing out the inner peripheral wall portions and the tooth surface portions radially outward while shearing, at an open end of the tubular portion
Data Source
AI summary
The tooth part includes: a tubular portion having an inner tooth portion formed on an inner peripheral surface and an outer tooth portion formed on an outer peripheral surface; a plurality of inner peripheral wall portions that each extend in an axial direction of the tubular portion and form a tooth tip portion of the inner tooth portion and a tooth bottom portion of the outer tooth portion; a plurality of outer peripheral wall portions that each extend in the axial direction and form a tooth bottom portion of the inner tooth portion and a tooth tip portion of the outer tooth portion; and an annular rib that is joined to the outer peripheral wall portions and that extends in an annular shape on an open end side with respect to the inner peripheral wall portions in the axial direction and radially outward from the inner peripheral wall portions, at an open end of the tubular portion.