Sliding Component Hard Particle Orientation for Wear Resistance
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Solution Overview
Problem
Conventional sliding components with copper alloy sliding sections fixed to steel or cast iron bases face accelerated wear at the outer periphery interface, leading to reduced durability.
Innovation Solution
A sliding component with a copper alloy sliding section containing hard particles, where the hard particles are arranged with their longitudinal directions aligned along the outer periphery of the interface, and a method involving thermal joining to enhance durability, using a base section made of steel or cast iron.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the sliding section is fixed to the base section by caulking, then the sliding section can be securely attached to the base section, but the production cost increases due to machining requirements
Solution Approach 1:
The patent replaces the mechanical caulking system with a pressing system that deforms the sliding section to achieve engagement. Instead of machining the sliding section for caulking attachment, the invention uses pressing force to deform the sliding section radially outward, causing it to engage with the base section through elastic deformation, thereby eliminating machining operations and reducing production cost
Solution Approach 2:
The patent changes the physical state and shape of the sliding section through pressing. The sliding section is pressed radially outward, causing elastic deformation that increases its diameter temporarily for engagement, then allows it to settle into a fitted position. This parameter change (shape and dimension) enables attachment without machining
2Ease of manufacture
If the sliding section is pressed against the base section to deform and engage, then production cost is reduced, but wear acceleration occurs at the outer periphery interface region
Solution Approach 1:
The patent applies local quality by creating a transition region between the sliding section and base section. The sliding section has a tapered outer peripheral surface that transitions from the sliding surface to the engagement surface, with the inclination angle carefully controlled. This local geometric modification distributes contact stress and prevents wear acceleration at the outer periphery interface
Solution Approach 2:
The patent performs preliminary action by pre-forming the tapered outer peripheral surface on the sliding section before the pressing operation. This preliminary geometric configuration ensures that when pressing occurs, the deformation and engagement happen in a controlled manner that prevents excessive stress concentration and wear at the interface region
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 arrangement of hard particles improves the durability of the sliding section at the outer periphery interface, reducing wear and enhancing the sliding component's performance.
Implementation Method 1
increasing temperatures of the base member and the sliding member by relatively rotating the sliding member with respect to the base member while relatively pressing the sliding member against the base member
Implementation Method 2
when heated, the copper alloy constituting the sliding member flows plastically
Implementation Method 3
stopping the relative rotation of the sliding member with respect to the base member and cooling the base member and the sliding member with the members being pressed against each other
Data Source
AI summary
A sliding component and its producing method are provided. The sliding component includes a base section made of steel or cast iron, and a sliding section having a sliding surface, made of copper alloy including hard particles, and joined to the base section. The hard particles in the sliding section are arranged such that those in a region including an outer periphery of the interface with the base section have their longitudinal directions coinciding with the directions along the outer periphery as compared to those in an inner peripheral side. This improves the durability of the sliding section in its region including the outer periphery of the interface with the base section.