Spiny Liner Constricted Projections Bonding Strength
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Solution Overview
Problem
Existing technologies for cast-iron cylindrical members with projections on the outer peripheral surface struggle to achieve sufficient bonding strength when integrated with metal on the outer peripheral surface side, despite focusing on the anchor part of the projections.
Innovation Solution
The spiny liner features a plurality of projections, including constricted projections, with specific shape control to enhance bonding strength. The shape is characterized by a minimum thickness value and a maximum thickness value, with a lock index calculated using formulas (I) and (II) to ensure a bonding strength of 1.55 or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If projections are provided on the outer peripheral surface to improve bonding strength, then bonding strength is improved, but the projection shape must be precisely controlled to avoid insufficient strength
Solution Approach 1:
The invention changes the geometric parameters of the projections by introducing a specific lock index formula that relates the number of projections, their height, and thickness ratios. By controlling these parameters to satisfy a minimum lock index value, the invention achieves sufficient bonding strength without requiring overly complex manufacturing precision, as the parameters can be controlled within reasonable ranges during production.
2Strength
If the anchor part of the projection is focused on to improve bonding strength, then bonding strength is improved, but further improvement is limited
Solution Approach 1:
The invention moves beyond focusing solely on the anchor part (one-dimensional approach) by introducing a comprehensive lock index that considers multiple dimensions: the number of projections, their height, and the thickness ratio. This multi-dimensional approach enables further improvement in bonding strength by optimizing the overall projection configuration rather than just the anchor part geometry.
3Strength
If more projections are provided to improve bonding strength, then bonding strength is improved, but manufacturing complexity increases
Solution Approach 1:
The invention uses the lock index formula to establish quantitative relationships between the number of projections and other geometric parameters. This allows for systematic optimization where increasing the number of projections can be balanced by adjusting height and thickness parameters, achieving improved bonding strength while maintaining manageable manufacturing complexity through parameter coordination rather than simple increase in projection count.
Data Source
AI summary
Provided is a spiny liner that may further improve bonding strength when being integrated with metal on the outer peripheral surface side. The spiny liner includes a plurality of projections including constricted projections on the surface. Denoting the number of constricted projections per 100 mm2 out of the projection by Pc, the average height of projections by h (mm), and the average of maximum thicknesses and the average of minimum thicknesses of any 20 projections out of the constricted projections by dw (mm) and dn (mm), respectively, the total value of (I) and (II) below is 1.55 or more.(I)=Pc×[(0.35hπ/12)×(2dw2−dw×dn−dn2)](I)=Pc×{(dn2/4)×r×0.35h}