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China Digital Chassis Back Panel Heat Sink Suppliers and Factory – High-Quality Telecom Terminal Components
Process
Step 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.
Step 02
Remove spout (Saw spout & knock out slag bag)
Equipment
Hydraulic presses
Precautions
- Pay attention to the surface without crushing or shortage of materials.
- Control the appearance and size.
Step 03
IPQC inspection
Test Tools
Caliper, projection, three-dimensional, visual inspection of appearance.
Precautions
Use measuring tools correctly and check dimensions according to drawings.
Step 04
SHAPING
Details & 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
Step 05
IPQC inspection
Inspection Type
Visual inspection of appearance
Step 06
CNC
Details & 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
- 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.
Step 07
Air tightness testing
Details & 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
- 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.
Step 08
100% material inspection
Inspection Type
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.
Step 09
Grinding
Details & 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.
Step 10
IPQC inspection
Inspection Type
Visual inspection of appearance
Step 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;
Step 12
IPQC inspection + Special Characteristics Inspection
Inspection Type
Visual inspection of appearance
Precautions
- Surface quality confirmation after coating;
- Hole need to needle gauge sampling, go -no go fixed gauges inspection.
Step 13
Riveting and pressing D4.7 dowels
Equipment
Pressure riveting jig, hydraulic press
Note
- 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;
- Check the height dimension after pressure riveting.
Step 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.
Step 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.
Step 16
Shipping
Precautions
- make sure the quantity is the same as order.
- Label and stamp on the outer box
- Provide a shipping report.
Step 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 raw material and equipment specifications are used in the die casting step?
A1: We use ADC12 material processed with a 1250T aluminum die casting machine. The furnace temperature is strictly maintained at 670°±20° with a material handle of 20±2MM. No secondary materials are permitted.
Q2: What parameters and requirements are used for air tightness testing?
A2: The test pressure value is set between 20kpa and 30kpa. The pressure is stabilized for 20 seconds, followed by a 10-second test time. The leakage control limit is strictly kept within 0.3kpa.
Q3: How do you ensure accuracy and quality during the CNC machining stage?
A3: CNC machining covers the internal cavity end faces, backside holes, side of one end, and through-holes. We prevent overcutting and missed processing, protect the surface from bruises and burrs, and ensure the surface finish meets Ra0.8 along with specified dimensional, shape, and location tolerances.
Q4: What precautions are implemented during the cleaning and powder spraying process?
A4: The process ensures that there are no different colors, dirt, touching, or scratching. The color must remain uniform and consistent with the approved sample. The powder thickness must be uniform with no accumulation of tumors and no exposed bottom.
Q5: What tools are used for FQC and OQC inspections, and what are their requirements?
A5: Both inspections utilize calipers, projection, needle gauges, tooth gauges, and visual inspection of the appearance and outer packaging. The critical requirement is to verify that all measuring tools are within their valid calibration periods and conform to SIP and customer requirements.