Product Specifications
|
Parameter |
Value |
|
Applicable Product Types |
Boxes, frames, housings, large parts with uneven wall thickness |
|
Dimensional Tolerance Standard |
GB/T 6411 CT9-CT11, for size >1000mm ±2.5~±4.0mm |
|
Wall Thickness Tolerance |
Nominal 6-20mm, allowable deviation -1.5~+2.0mm |
|
Internal Defect Standard |
UT Level 2, pores ≤Φ3mm, single shrinkage area ≤25mm² |
|
Mechanical Properties (A356-T6) |
Tensile ≥220MPa, Yield ≥140MPa, Elongation ≥3% |
|
Surface Roughness |
Non-machined surfaces Ra25-50μm |
|
Forming Process |
Sand casting / Lost foam casting |
|
Heat Treatment |
T6 solid solution and aging treatment available |
Heavy-Duty Castings for Large Equipment
We produce large aluminum castings for industrial equipment frames, housings, and boxes. Our casting shop is equipped with a 15-ton arc furnace. We also have a large car-bottom annealing furnace. This allows us to make castings that exceed 1000 millimeters in size. Our main material is A356 aluminum alloy. We use sand casting or lost foam processes. These large castings are used in heavy machinery, construction equipment, and industrial structures. We have supplied castings for large projects. Our ability to handle big parts sets us apart from shops that only make small precision castings.
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Dimensional Control on Large Parts
For parts over 1000 millimeters, we control the dimensional tolerance to GB/T 6411 CT9 to CT11. The size deviation is plus 2.5 to plus 4.0 millimeters. The nominal wall thickness is 6 to 20 millimeters. The allowable deviation is minus 1.5 to plus 2.0 millimeters. The non-machined surfaces have a roughness of Ra25 to 50 micrometers. These tolerances are reasonable for large castings. We understand that large parts have different challenges than small ones. Thermal expansion, mold shift, and metal shrinkage are all factors we manage during production.
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Internal Quality and Heat Treatment
We inspect large aluminum castings with UT level 2 standards. Individual gas pores cannot exceed 3 millimeters in diameter. The shrinkage area in any single region is limited to 25 square millimeters. After casting, we do T6 heat treatment in our own car-bottom resistance furnace. The A356 material then achieves a tensile strength of at least 220 MPa. The yield strength is at least 140 MPa. The elongation is at least 3 percent. We do not send parts to outside shops for heat treatment. This keeps the process under our control and reduces lead time.
Quality Testing in Our Lab
We have a dedicated testing lab on site. Our ultrasonic flaw detector checks for internal defects in every large casting. We take mechanical test samples with each batch. These samples go to our universal testing machine for tensile, yield, and elongation data. We also provide a spectral analysis report for the material chemistry. All quality data is traceable to the specific production batch. We support third-party inspection at our factory. This gives you confidence in the castings you receive.
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