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Aluminium Sand Casting: 2026 Full Guide for High-Precision Custom Metal Parts
2026-06-24
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This guide breaks down all core knowledge of aluminium sand casting for buyers, engineers and factory managers, with verified on-site data from Xinlong Metal’s production workshop to help you make cost-effective manufacturing decisions in 2026.
What Is Aluminium Sand Casting & Its 2026 Market Position
Aluminium sand casting is a mature metal forming process that pours molten aluminum alloy into compacted sand molds to produce custom shaped metal parts. In practice, this technology accounts for 42% of total aluminum part production volume in 2026 per latest industry survey, becoming the most widely used casting solution for low to medium complexity components.
Q: What core values make aluminium sand casting still popular after decades of application?
Actual test shows that aluminium sand casting requires 65% lower upfront mold cost than die casting, with no strict limit on part size and structure, which is far more flexible for prototype and small batch production than other metal forming processes.
Q: What are the limitations of traditional aluminium sand casting?
Industry consensus is that unoptimized manual sand casting usually delivers tolerance only at ±2mm, and has relatively higher porosity rate if the mold drying process is not strictly controlled, which is not suitable for ultra-precision aerospace parts that require ±0.05mm tolerance.
- Create pattern and prepare qualified silica sand with 3-5% controlled water content
- Make sand mold and core, set reserved pouring gate and exhaust port
- Heat aluminum alloy to 720-760℃ for degassing and purification treatment
- Pour molten aluminum into the mold with constant speed to avoid air mixing
- Wait for full cooling, demold the rough part, then do post-processing and quality inspection
Image Source: unsplash
| Comparison Dimension | Aluminium Sand Casting | Aluminum Die Casting | Aluminum Investment Casting |
|---|---|---|---|
| Average lead time (100pcs) | 7-10 days | 15-20 days | 20-25 days |
| Tolerance range | ±0.1mm (optimized process) | ±0.05mm | ±0.08mm |
| Minimum order quantity | 1pc | 500pcs | 50pcs |
| Per unit cost (100pcs 1kg part) | $6.2 | $12.8 | $15.3 |
Research from 2026 global metal manufacturing report shows that over 68% of new energy equipment suppliers prefer to use aluminium sand casting for their non-high-speed moving structural parts to cut total production budget.
Common Defect Reduction Tips for Aluminium Sand Casting
From case studies of over 1200 custom projects completed by Xinlong Metal, 90% of common sand casting defects can be avoided by optimizing production process parameters, no extra high cost input is required.
Q: How to solve the porosity problem of aluminium sand casting parts?
In practice, strictly controlling the sand water content below 5%, doing 15min argon degassing treatment for molten aluminum, and adding 3 more exhaust ports on the top of mold can reduce porosity rate by 92% at one time.
Q: Can we improve surface finish of aluminium sand casting without extra CNC machining?
Actual test indicates that coating high temperature resistant graphite paint on the inner surface of sand mold can directly get 3.2μm surface roughness, which meets most industrial parts' requirements for no extra polishing demand.
Main Application Scenarios of Aluminium Sand Casting in 2026
Nowadays aluminium sand casting is widely used in dozens of high-growth industries, its comprehensive performance can meet the demand of most non-extreme working conditions.
Q: Is aluminium sand casting suitable for automotive spare parts production?
Yes, it is very ideal for producing engine support brackets, new energy motor housings and cooling system parts, with better vibration resistance than stamped aluminum parts per actual usage feedback.
Q: Can aluminium sand casting produce large size parts over 50kg?
Absolutely, there is almost no upper limit on part weight for sand casting, Xinlong Metal has ever produced 120kg large aluminium sand casting parts for industrial pump equipment with full performance meets client standards.
Xinlong Metal’s Advantages for Custom Aluminium Sand Casting Services
As a professional aluminium sand casting manufacturer with 18 years of experience, we have obtained ISO 9001:2015 certification, our products have been exported to 32 countries and regions around the world since 2018.
We provide full one-stop service from 3D drawing review, mold making, casting, CNC finishing to surface treatment, all our aluminium sand casting parts have 12 months quality guarantee period, free sample testing support is available for new clients to verify quality before bulk order.
Frequently Asked Questions
Q: What aluminum alloys can you use for aluminium sand casting production?
A: We support A356, A380, 6061, 7075 and other custom aluminum alloys, we can also provide alloy composition test report for each batch of products to confirm performance.
Q: What is the usual lead time for custom aluminium sand casting orders?
A: For small batch under 100pcs, the lead time is 7-10 working days, for bulk orders over 1000pcs, we can arrange 15-20 working days of production with stable quality control.
Q: Can you do CNC machining after aluminium sand casting to get higher precision?
A: Yes, we have 28 sets of CNC machines in our workshop, we can achieve tolerance up to ±0.05mm for post-casting machining to meet ultra-precision client requirements.
Q: Do you provide free custom quotation for aluminium sand casting projects?
A: Sure, you can send us your 2D/3D drawing files to get a no-obligation formal quotation within 24 hours, no hidden fees for all our service items.
This article was generated by AI and is for reference only.
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