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China Suppliers Factory Aluminum CNC Machining Cover for 5G AAU Base Station Components
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
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
Details
Back shaping
Equipment: Cutting edge ruler, shaping tooling
Precautions
Within 0.2mm of the front plane of the product
5
IPQC inspection
Details
Visual inspection of appearance
6
CNC
Details
Machining main Inlet, main Dump Port Face, Backside, Perforated Overbore
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
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
Details
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
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
Details
Visual inspection of appearance
10
CLEANING + Chemical conversion membrane + POWDER 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
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)
Q1: What materials and machinery are utilized in your aluminum die casting process?
A1: We utilize ADC12 aluminum material and a 300T aluminum die casting machine. The furnace temperature is strictly maintained at 640°±20° with a material handle of 20±2mm to ensure maximum component structural integrity.
Q2: How do you prevent surface and dimensional defects during CNC machining?
A2: We implement strict precautions including avoiding over-cutting or missing processes, keeping the surface free of scratches or burrs, and ensuring a surface finish of Ra1.6. Size and shape tolerances are verified continuously.
Q3: What methods are used for quality inspection throughout the process?
A3: We apply a multi-tier quality control flow including IPQC (In-Process Quality Control), 100% material inspection, FQC (Final Quality Control), and OQC (Outgoing Quality Control). We utilize precision instruments such as calipers, projection systems, three-dimensional measurement systems, needle gauges, and go/no-go fixed thread gauges.
Q4: What surface treatments do the die-cast parts undergo?
A4: The components undergo cleaning, chemical conversion membrane application, and powder spraying. We inspect to ensure no color variations, dirt, or scratches exist, and that the powder thickness is uniform with no exposed bottom.
Q5: How are the products protected during packaging and shipping?
A5: Products are packed using custom cartons, knife cards, clapboards, and bubble bags to prevent metal-on-metal scratching and deformation. Prior to shipping, we perform OQC inspections to verify quantities and provide a detailed shipping report.