Does Contact Surface Wear Affect Fastening? Cause Analysis

[Abstract]:Insufficient Material Hardness: If the contact surface material between the fastener and the connected part is too soft (e.g., aluminum alloy paired with standard steel bolts)

1. Core Causes of Wear

Insufficient Material Hardness: If the contact surface material between the fastener and the connected part is too soft (e.g., aluminum alloy paired with standard steel bolts), it easily develops scratches under long-term stress and friction.
Low Surface Finish: The presence of burrs or oxide layers on the contact surfaces directly intensifies wear during installation.
Uneven Load Distribution: Installation misalignment causes excessive localized stress on the contact area, leading to concentrated wear.

2. Wear-Resistant Improvement Solutions

Material Optimization: Apply carburizing or nitriding treatments to the contact surfaces to enhance surface hardness (e.g., nitrided bolt heads can achieve hardness exceeding HV500); alternatively, select high-strength wear-resistant alloys such as chromium-molybdenum steel.
Surface Treatment Upgrade: Plate the contact surfaces with hard chrome (reaching up to HRC60 hardness) or apply ceramic coatings to reduce the coefficient of friction. This is highly suitable for heavy machinery drive shaft bolts.
Structural Improvements: Install wear-resistant washers (such as copper-based alloy washers) on the contact surfaces to distribute the load; incorporate boss positioning structures to prevent installation misalignment.

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Does Contact Surface Wear Affect Fastening? Cause Analysis

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