Aluminum Alloy Slider Cracking Resistance
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Solution Overview
Problem
Aluminum alloy sliders produced by die casting are prone to cracking during caulking or bending processes, which complicates their practical application, and they require sufficient strength to withstand user manipulation.
Innovation Solution
The use of an aluminum-copper-silicon-based alloy with reduced lead concentration, specifically ADC 12, and controlling impurity concentrations of Fe, Mg, Zn, Sn, Ni, Mn, Cr, and Ti to enhance mechanical strength and plastic workability, along with a plating film for added properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If aluminum alloy is used as base material for slider, then weight of metal slide fastener is reduced, but cracking easily occurs when plastic working is applied to pull tab attaching post
Solution Approach 1:
The invention changes the chemical composition parameters of the aluminum alloy by strictly controlling the concentration of Fe, Mg, Zn, Sn, Ni, Mn, Cr, and Ti impurities to be 1% by mass or less. This parameter change in material composition improves the plastic workability and reduces cracking during caulking or bending processes while maintaining the lightweight advantage of aluminum alloy
Solution Approach 2:
The invention uses a specifically composed aluminum alloy with controlled impurity levels as a composite material that combines the lightweight property of aluminum with improved mechanical properties. The controlled composition creates a material that has both low density and high resistance to cracking during plastic deformation
2Productivity
If die casting method is used to produce aluminum alloy slider, then high dimensional accuracy and high productivity are achieved, but cracking easily occurs during caulking or bending process
Solution Approach 1:
The invention changes the material composition parameters of the aluminum alloy used in die casting by controlling impurity concentrations. This allows the material to maintain the high dimensional accuracy and productivity benefits of die casting while adding resistance to cracking during subsequent plastic working processes
3Ease of manufacture
If conventional aluminum alloy with higher impurity content is used, then manufacturing is easier, but plastic workability deteriorates and cracking occurs
Solution Approach 1:
The invention changes the impurity concentration parameters to be 1% by mass or less, which maintains ease of manufacturing through die casting while dramatically improving plastic workability. The controlled composition allows the material to be easily manufactured yet remains ductile enough for caulking and bending operations without cracking
Data Source
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AI summary
Provided is an aluminum alloy slider for a slide fastener, which has both practical strength and plastic workability. A slider for a slide fastener, the slider comprising a slider body (100) and a pull tab attaching post (120) formed on the slider body (100), the slider comprising an aluminum alloy as a base material, the base material containing from 9.6 to 12.0% by mass of Si; and from 1.5 to 3.5% by mass of Cu; the balance being Al and inevitable impurities, the inevitable impurities having a Pb concentration of 0.01% by mass or less.