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China Aluminum CNC Machining Cover for 5G AAU Base Station – Trusted Suppliers & Factory Solutions
Process
1, Aluminum die casting
Equipment & Material
Equipment: 300T aluminum die casting machine, Material: ADC12
Process Characteristics
- a. Furnace temperature: 640°±20°, Material handle: 20±2MM;
- b. Secondary materials cannot be used;
- c. Test the material composition to confirm that it is OK and can be produced;
- d. First piece confirmation is required after die-casting.
Precautions:
- a. The filling quality of the surface needs to be confirmed. No cold insulation, no bulging, or lack of material for the pillars.
- b. Pay attention to the surface to avoid sticking molds, drawing molds, or poor ejector pin convexity.
- c. The ejector pins are concave by 0-0.2mm for non-machine-added surfaces and 0-0.2mm for machine-added surfaces. The thimble needs to be convex 0-0.2mm.
2, Remove spout (Saw spout and knock out slag bag)
Equipment
Equipment : Wooden Stick/sawing machine/labor protection gloves
Precautions:
- a. Pay attention to the surface without crushing or shortage of materials.
- b. Control the appearance and size.
3, IPQC inspection
Test Tool
Caliper, projection, three-dimensional, visual inspection of appearance.
Precautions:
Use measuring tools correctly and check dimensions according to drawings.
4, SHAPING
Process & Equipment
Back shaping. Equipment: Cutting edge ruler, shaping tooling.
Precautions:
Within 0.2mm of the front plane of the product.
5, IPQC inspection
Inspection Details
Visual inspection of appearance.
6, CNC
Process & Equipment
Machining main Inlet, main Dump Port Face, Backside, Perforated Overbore.
Equipment: CNC machine, flat-bottomed cutter, drill bit, tap processing fixture.
Equipment: CNC machine, flat-bottomed cutter, drill bit, tap processing fixture.
Precautions:
- a. Do not over-cut or miss processing;
- b. Be careful not to scratch or burr the surface;
- c. Ensure the finish of the processed surface is Ra1.6, and the size and shape tolerances.
7, 100% material inspection
Inspection Details
Visual inspection of appearance.
Note:
- a. The surface of the product should not be overcut, sand holes, lack of material, burrs, and other undesirable phenomena.
- b. go-no go fixed gauges inspection.
- c. Test the flatness of the product according to the drawing.
- d. Hold the product lightly to prevent deformation.
8, Grinding
Process & Equipment
The sharp corners of the product are chamfered, deburred, non-machined ejector pins are sharpened, and polished to smooth the appearance.
Equipment: Air grinder, 120# sandpaper.
Equipment: Air grinder, 120# sandpaper.
Note:
No processing should be missed, no sharp corners or burrs should be removed, and the R corners should be connected smoothly.
9, IPQC inspection
Inspection Details
Visual inspection of appearance.
10, CLEANNING + Chemical conversion membrane + POWER SPRAYING
Precautions:
- a. No different colors, dirty, not touching and scratching.
- b. Color according to the sample, uniform and consistent;
- c. Powder thickness is uniform, no accumulation of tumors, no exposed bottom.
11, IPQC inspection + Special Characteristics Inspection
Inspection Details
Visual inspection of appearance.
Note:
- a. Confirm the surface quality after powder spraying;
- b. The holes need to be randomly inspected with a needle gauge/tested with a tooth hole pass gauge.
12, Full inspection of appearance + packaging
Equipment
Carton, knife card, clapboard, bubble bag.
Note:
- a. The appearance shall be inspected according to the sample. The surface shall be free of dirt, scratches, dents and defects.
- b. The tooth pattern must comply with the go – no go fixed gauge inspection;
- c. The product is placed in the knife card, and then packaged.
13, FQC inspection
Test Tools
Caliper, projection, needle gauge, tooth gauge, appearance and outer packaging inspection.
Precautions:
Whether the measuring tool is within the calibration period.
14, Shipping
Precautions:
- a. make sure the quantity is the same as order.
- b. Label and stamp on the outer box.
- c. Provide a shipping report.
15, OQC shipping inspection
Test Tools
Caliper, projection, needle gauge, tooth gauge, appearance and outer packaging inspection.
Precautions:
Whether the measuring tool is within the calibration period. Whether it is consistent with SIP requirements and customer requirements.
Frequently Asked Questions (FAQ)
What material is used in the aluminum die casting process?
The process utilizes ADC12 aluminum alloy, processed with a 300T aluminum die casting machine. Secondary materials are strictly prohibited to ensure material integrity.
What are the surface roughness and quality requirements for CNC machining?
The finish of the processed surface must achieve Ra1.6. Precautions include avoiding over-cutting, preventing surface scratches or burrs, and ensuring strict adherence to size and shape tolerances.
What surface quality standards must be met during chemical conversion and powder spraying?
The powder thickness must be uniform with no accumulation of tumors or exposed bottom. The color must match the reference sample consistently, and the surface should be free of dirt, scratches, and color variations.
How are dimensional and thread tolerances verified?
Dimensional tolerances are checked using calipers, projection, and three-dimensional tools. Thread patterns and holes are verified using go-no go fixed gauges, needle gauges, and tooth hole pass gauges.
What steps are taken to ensure quality control during final shipping?
OQC shipping inspections verify that all measuring tools are within their calibration period. Inspectors check that the packaging (cartons, knife cards, clapboards, and bubble bags) is secure, confirm that the final quantity matches the order, label/stamp the outer box, and provide a detailed shipping report.