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China OEM Aluminum Die Casting Heatsink for 5G Base Station - Top Suppliers & Reliable Factory Solutions
Process
1
Aluminum die casting
Equipment & Material
- Equipment: 400T 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 & 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
Details & Equipment
- 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 & 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
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
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
What raw materials and machinery parameters are used in the initial die casting process?
The process utilizes ADC12 material and a 400T aluminum die casting machine. Key parameters include maintaining a furnace temperature of 640°±20° and a material handle size of 20±2MM. Additionally, secondary materials cannot be used.
What quality checks are performed during the CNC machining stage?
During CNC machining, precautions are taken to avoid over-cutting or missing processing, prevent surface scratches or burrs, and ensure the finished surface roughness meets Ra1.6 along with the required size and shape tolerances.
What are the requirements for the chemical conversion and powder spraying process?
Key precautions include ensuring no color variations, dirt, or surface scratches. The color must be uniform and consistent with the approved sample, and the powder thickness must be uniform with no accumulation of tumors or exposed bottom.
How are final dimensions and thread patterns verified before packaging?
Holes are randomly inspected with needle gauges, and tooth patterns are verified using go-no go fixed gauge inspections to ensure they strictly meet customer requirements before placing products into protective knife cards and cartons.
What is the difference between FQC and OQC shipping inspections?
FQC inspection focuses on checking dimensions, appearance, and packaging details with calibrated tools. OQC shipping inspection acts as the final gatekeeper, verifying that all measuring tools remain in calibration and that the shipment is completely consistent with SIP and customer requirements.