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China Suppliers Factory Digital Chassis Back Panel Heat Sink for Telecom Terminal Applications
Process
1
Aluminum die casting
Specifications & Equipment
Equipment: 1250T aluminum die casting machine
Material: ADC12
Material: ADC12
Process Characteristics
- a. Furnace temperature: 670°±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)
Specifications & Equipment
Equipment: hydraulic presses
Precautions
- a. Pay attention to the surface without crushing or shortage of materials.
- b. Control the appearance and size.
3
IPQC inspection
Test Tools
Caliper, projection, three-dimensional, visual inspection of appearance.
Precautions
Use measuring tools correctly and check dimensions according to drawings.
4
SHAPING
Specifications & Equipment
Process: Back shaping
Equipment: Cutting edge ruler, shaping tooling, hydraulic presses
Equipment: Cutting edge ruler, shaping tooling, hydraulic presses
Precautions
Within 0.3mm of the front plane of the product.
5
IPQC inspection
Method
Visual inspection of appearance.
6
CNC
Specifications & Equipment
Process: 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
- a. Do not overcut, missed processing;
- b. Surface attention must not be bruised, burrs; and
- c. Ensure that the surface finish Ra0.8, size, shape and location tolerances.
7
Air tightness testing
Specifications & Equipment
Parameters: 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
- a. Do a good job on the product appearance surface protection, sealing groove parts without implementation of touch scratch;
- b. Discover the phenomenon of air leakage in time to pick out the marking.
8
100% material inspection
Method
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.
9
Grinding
Specifications & Equipment
Process: 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
Method
Visual inspection of appearance.
11
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.
12
IPQC inspection + Special Characteristics Inspection
Method
Visual inspection of appearance.
Precautions
- a. Surface quality confirmation after coating;
- b. Hole need to needle gauge sampling, go-no go fixed gauges inspection.
13
Riveting and pressing D4.7 dowels
Specifications & Equipment
Equipment: Pressure riveting jig, hydraulic press
Note
- a. Check that the pins are loaded without deviation or falling off, and that there is no bulge or pressure injury on the surface of the product;
- b. Check the height dimension after pressure riveting.
14
Full inspection of appearance + packaging
Note
- a. 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!
- 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.
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
- a. Make sure the quantity is the same as order.
- b. Label and stamp on the outer box.
- c. 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)
Q: What is the furnace temperature and material handle requirement for the aluminum die casting process?
The furnace temperature must be maintained at 670°±20°, and the material handle must be 20±2MM. Secondary materials are strictly prohibited.
Q: What parameters are controlled during the air tightness testing?
The test pressure is set between 20kpa and 30kpa, with a stabilized pressure time of 20 seconds, a test duration of 10 seconds, and leakage controlled strictly within 0.3kpa.
Q: What tools are used in FQC and OQC inspections?
Both inspections utilize calipers, projection, needle gauges, tooth gauges, and visual inspection of both the appearance and the outer packaging. It is essential that all measuring tools are within their calibration period.
Q: What are the precautions for the CNC machining step?
Precautions include avoiding overcutting or missed processing, ensuring the surface is free of bruises and burrs, and ensuring that the surface finish reaches Ra0.8 along with correct size, shape, and location tolerances.
Q: What is required during the riveting and pressing of D4.7 dowels?
Pins must be loaded without deviation or falling off. The product surface must be checked to ensure there are no bulges or pressure injuries, and the height dimension must be verified after pressure riveting.
Q: How is the product surface protected during powder spraying and cleaning?
The process ensures no different colors, dirt, touching, or scratching. The color must be uniform according to the sample, and the powder thickness must be uniform with no accumulation of tumors or exposed bottom.