China Aluminum Precision Die Casting Heat Sink Factory and Suppliers for 5G Applications
Production Process Details
Aluminum Die Casting
Equipment: 1250T aluminum die casting machine
Material: ADC12
- 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.
- 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.
Remove Spout
Saw spout and knock out slag bag.
Equipment: Sawing machine
- Pay attention to the surface without crushing or shortage of materials.
- Control the appearance and size.
IPQC Inspection
Test tool: Caliper, projection, three-dimensional, visual inspection of appearance.
Use measuring tools correctly and check dimensions according to drawings.
Shaping
Back shaping.
Equipment: Cutting edge ruler, shaping tooling
Within 0.3mm of the front plane of the product.
IPQC Inspection
Visual inspection of appearance
CNC Machining
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
- 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.
Air Tightness Testing
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
- 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.
100% Material Inspection
Visual inspection of appearance
- 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.
Grinding
Chamfering R-angle, deburring, thimble shaving on non-machined surfaces, polishing and smoothing the shape.
Equipment: Air grinder, 120# sandpaper
Do not miss the processing, no sharp corners, burrs removed cleanly, connected to the R angle of the smooth.
IPQC Inspection
Visual inspection of appearance
Surface Treatment
CLEANING + Chemical conversion membrane + POWDER SPRAYING
- 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.
IPQC & Special Inspection
Visual inspection of appearance
- 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.
Assembling & Press Riveting
D6 * 12 and D3 * 8 pins are clinched in the corresponding holes of the product.
Equipment: Pressure riveting jig, hydraulic press
- Check the pin after loading without offset, fall off, the product surface without bulging, bruises.
- Check the height size after riveting.
Appearance & Packaging
Full inspection of appearance + packaging.
Equipment: Carton, knife card, clapboard, bubble bag
- 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.
FQC Inspection
Test Tools: Caliper, projection, needle gauge, tooth gauge, appearance and outer packaging inspection.
Whether the measuring tool is within the calibration period.
Shipping
Delivery preparation and documentation.
- Make sure the quantity is the same as order.
- Label and stamp on the outer box.
- Provide a shipping report.
OQC Shipping Inspection
Test Tools: Caliper, projection, needle gauge, tooth gauge, appearance and outer packaging inspection.
Whether the measuring tool is within the calibration period. Whether it is consistent with SIP requirements and customer requirements.
Frequently Asked Questions (FAQ)
QWhat materials and parameters are used in the first stage of the manufacturing process?
The first stage, Aluminum Die Casting, utilizes ADC12 material and a 1250T aluminum die casting machine. The furnace temperature must be strictly maintained at 670°±20° with a material handle of 20±2MM. Secondary materials cannot be used.
QHow is the air tightness of the products tested?
Air tightness testing is performed using Airtight Tooling and Airtightness Test Equipment. The test pressure is maintained between 20kpa and 30kpa, with a stabilized pressure time of 20 seconds, a test time of 10 seconds, and leakage controlled strictly within 0.3kpa.
QWhat precautions are taken during the CNC machining stage?
During CNC machining, operators must prevent overcutting and missed processing. The surface must be free from bruises and burrs, and the surface finish must achieve Ra0.8 alongside standard size, shape, and location tolerances.
QWhat tools are used for IPQC, FQC, and OQC inspections?
These inspection stages utilize calipers, projections, three-dimensional measurement systems, needle gauges, and tooth gauges, alongside direct visual inspections of both the product appearance and outer packaging.
QWhat are the key requirements for the powder spraying process?
The powder spraying process requires uniform color consistent with the sample, with no different colors, dirt, touching, or scratching. The powder thickness must be uniform, with no bottom exposure or accumulation of tumors.
QWhat packaging materials and quality checks are used before shipping?
Packaging uses cartons, knife cards, clapboards, and bubble bags. Before packing, the appearance is checked against a sample to ensure it is free from dirt, scratches, dents, and defects, and the tooth pattern must pass a go–no go fixed gauge inspection.