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China Aluminum Precision Die Casting Heat Sink Suppliers - 5G CNC Machine Cooling Solution from Factory
Process
1
Aluminum die casting
Process characteristics
- Furnace temperature: 670°±20°, Material handle: 20±2MM;
- Secondary materials cannot be used;
- Test the material composition to confirm that it is OK and can be produced;
- First piece confirmation is required after die-casting.
Precautions:
- The filling quality of the surface needs to be confirmed. No cold insulation, no bulging, or lack of material for the pillars.
- Pay attention to the surface to avoid sticking molds, drawing molds, or poor ejector pin convexity.
- 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)
Precautions:
- Pay attention to the surface without crushing or shortage of materials.
- Control the appearance and size.
3
IPQC inspection
Precautions:
Use measuring tools correctly and check dimensions according to drawings.
4
SHAPING
Precautions:
Within 0.3mm of the front plane of the product.
5
IPQC inspection
6
CNC
Precautions:
- Do not overcut, missed processing;
- Surface attention must not be bruised, burrs; and
- Ensure that the surface finish Ra0.8, size, shape and location tolerances.
7
Air tightness testing
Test Settings
Test pressure value in 20kpa ~ 30kpa, stabilized pressure 20 seconds, test time 10 seconds, leakage control within 0.3kpa
Precautions:
- Do a good job on the product appearance surface protection, sealing groove parts without implementation of touch scratch;
- Discover the phenomenon of air leakage in time to pick out the marking.
8
100% material inspection
Note:
- The surface of the product should not be overcut, sand holes, lack of material. Burrs, and other undesirable phenomena;
- go-no go fixed gauges inspection;
- Test the flatness of the product according to the drawing;
- Hold the product lightly to prevent deformation.
9
Grinding
Process details
Chamfering R-angle, deburring, thimble shaving on non-machined surfaces, polishing and smoothing the shape
Note:
Do not miss the processing, no sharp corners, burrs removed cleanly, connected to the R angle of the smooth.
10
IPQC inspection
11
CLEANNING + Chemical conversion membrane + POWER SPRAYING
Precautions:
- No different colors, dirty, not touching and scratching;
- Color according to the sample, uniform and consistent;
- Powder thickness is uniform, no accumulation of tumors, no exposed bottom.
12
IPQC inspection + Special Characteristics Inspection
Note:
- Confirm the surface quality after powder spraying;
- The holes need to be randomly inspected with a needle gauge/tested with a tooth hole pass gauge.
13
Assembling-Press riveting
Process details
D6 * 12 and D3 * 8 pins are clinched in the corresponding holes of the product.
Note:
- check the pin after loading without offset, fall off, the product surface without bulging, bruises;
- Check the height size after riveting.
14
Full inspection of appearance + packaging
Note:
- The appearance shall be inspected according to the sample. The surface shall be free of dirt, scratches, dents and defects, and the glue dispensing shall be even and without defects!
- The tooth pattern must comply with the go – no go fixed gauge inspection;
- The product is placed in the knife card, and then packaged.
15
FQC inspection
Precautions:
Whether the measuring tool is within the calibration period.
16
Shipping
Precautions:
- make sure the quantity is the same as order.
- Label and stamp on the outer box
- Provide a shipping report.
17
OQC shipping 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)
Q
What raw materials and machinery specs are utilized during the initial casting process?
The process utilizes ADC12 material processed through a 1250T aluminum die casting machine. The furnace temperature is strictly maintained at 670°±20° with a material handle of 20±2MM.
Q
What parameters are required for the air tightness testing?
The test requires a pressure value range of 20kpa to 30kpa. The pressure must be stabilized for 20 seconds, with a test duration of 10 seconds. The leakage control limit is set within 0.3kpa.
Q
Which inspection tools are used during IPQC, FQC, and OQC stages?
Depending on the stage, the quality control teams utilize calipers, projection systems, three-dimensional measurement devices, needle gauges, tooth gauges, and visual inspection methods.
Q
What are the critical quality controls during CNC machining?
Operators must avoid overcutting and missed processing. The surface must be free from bruises and burrs, maintaining a surface finish of Ra0.8 alongside strict dimensional and location tolerances.
Q
What specifications must be followed during the assembling and riveting stage?
D6 * 12 and D3 * 8 pins are clinched into their corresponding holes using a pressure riveting jig and hydraulic press. Post-assembly checks must verify that there is no pin offset, fall-off, surface bulging, or bruises, and that the final height size is correct.