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China Suppliers Factory Aluminum Precision Die Casting Heat Sink for 5G CNC Machines
Process Workflow
01
Aluminum die casting
Equipment & Material
Equipment: 1250T aluminum die casting machine
Material: ADC12
Material: ADC12
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.
02
Remove spout
Equipment
Sawing machine (Saw spout and knock out slag bag)
Precautions
- Pay attention to the surface without crushing or shortage of materials.
- Control the appearance and size.
03
IPQC inspection
Test Tools
Caliper, projection, three-dimensional, visual inspection of appearance.
Precautions
Use measuring tools correctly and check dimensions according to drawings.
04
SHAPING
Details & Equipment
Back shaping
Equipment: Cutting edge ruler, shaping tooling
Equipment: Cutting edge ruler, shaping tooling
Precautions
Within 0.3mm of the front plane of the product.
05
IPQC inspection
Inspection Process
Visual inspection of appearance
06
CNC
Machining details & Equipment
Machining of internal cavity end faces, Backside holes, Side of one end, Hole through-hole
Equipment: CNC machine, flat-bottomed gong tool, Drill Bit, Tap machining jig
Equipment: CNC machine, flat-bottomed gong tool, Drill Bit, Tap machining jig
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.
07
Air tightness testing
Parameters & Equipment
Test pressure value in 20kpa ~ 30kpa, stabilized pressure 20 seconds, test time 10 seconds, leakage control within 0.3kpa
Equipment: Airtight Tooling, Airtightness Test Equipment
Equipment: Airtight Tooling, Airtightness Test Equipment
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.
08
100% material inspection
Inspection Process
Visual inspection of appearance
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.
09
Grinding
Process & Equipment
Chamfering R-angle, deburring, thimble shaving on non-machined surfaces, polishing and smoothing the shape
Equipment: Air grinder, 120# sandpaper
Equipment: Air grinder, 120# sandpaper
Note
Do not miss the processing, no sharp corners, burrs removed cleanly, connected to the R angle of the smooth.
10
IPQC inspection
Inspection Process
Visual inspection of appearance
11
Cleaning + Chemical conversion membrane + Powder 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
Inspection Process
Visual inspection of appearance
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 & Equipment
D6 * 12 and D3 * 8 pins are clinched in the corresponding holes of the product.
Equipment: Pressure riveting jig, hydraulic press
Equipment: Pressure riveting jig, hydraulic press
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
Equipment
Carton, knife card, clapboard, bubble bag
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
Test Tools
Caliper, projection, needle gauge, tooth gauge, appearance and outer packaging 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
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 equipment are used in the die casting process?
The process uses a 1250T aluminum die casting machine with ADC12 material. The furnace temperature is strictly controlled at 670°±20°.
Q2: How is the air tightness of the products tested?
Air tightness is tested using specialized airtight tooling and testing equipment. The test pressure is maintained between 20kpa and 30kpa with a stabilized pressure time of 20 seconds and a test time of 10 seconds. The leakage must be controlled within 0.3kpa.
Q3: What are the key quality precautions during the powder spraying stage?
Precautions include ensuring no color discrepancies, no dirt, and avoiding touching or scratching. The color must match the sample uniformly, and the powder thickness must be consistent without accumulation or exposed bottom parts.
Q4: What inspections are conducted before the products are shipped?
Before shipping, the products undergo FQC and OQC inspections using calipers, projection, needle gauges, tooth gauges, and visual inspection of both the appearance and the outer packaging. Tools must be verified to be within their calibration period.
Q5: How is the product protected during the final packaging stage?
During packaging, the appearance is fully inspected according to the sample to ensure it is free of dirt, scratches, dents, and defects. The products are placed in knife cards, surrounded by cartons, clapboards, and bubble bags to prevent damage.