China Suppliers Factory for Aluminum Precision Die Casting Heat Sink for 5G CNC Machines
Manufacturing Process
Aluminum Die Casting
- 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)
- Pay attention to the surface without crushing or shortage of materials.
- Control the appearance and size.
IPQC Inspection
Use measuring tools correctly and check dimensions according to drawings.
Shaping
Within 0.3mm of the front plane of the product.
IPQC Inspection
CNC Machining
- Do not overcut, missed processing.
- Surface attention must not be bruised, burrs.
- Ensure that the surface finish Ra0.8, size, shape and location tolerances.
Air Tightness Testing
- 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
- 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
Do not miss the processing, no sharp corners, burrs removed cleanly, connected to the R angle of the smooth.
IPQC Inspection
Cleaning + Chemical Conversion Membrane + Power 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 Inspection + Special Characteristics Inspection
- 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
- Check the pin after loading without offset, fall off, the product surface without bulging, bruises.
- Check the height size after riveting.
Full Inspection of Appearance + Packaging
- 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
Whether the measuring tool is within the calibration period.
Shipping
- Make sure the quantity is the same as order.
- Label and stamp on the outer box.
- Provide a shipping report.
OQC Shipping Inspection
Whether the measuring tool is within the calibration period. Whether it is consistent with SIP requirements and customer requirements.
Frequently Asked Questions (FAQ)
What equipment and materials are used in the initial aluminum die casting process?
We utilize a 1250T aluminum die casting machine with raw ADC12 material. The process strictly forbids the use of secondary materials and requires material composition testing prior to production.
What are the standard testing parameters for the air tightness test?
The air tightness test is performed using professional airtight tooling and test equipment. The test pressure value is maintained between 20kpa and 30kpa, with a stabilized pressure time of 20 seconds and a test duration of 10 seconds. The leakage must be controlled within 0.3kpa.
How do you ensure accuracy and quality during CNC machining?
Quality is controlled by preventing overcutting and missed processing. Operators ensure the surface is free of bruises and burrs, maintaining a surface finish of Ra0.8, and verifying all shape, size, and location tolerances.
What steps are involved in the post-casting finishing and surface treatment?
Finishing begins with spout removal and shaping, followed by grinding (chamfering, deburring, thimble shaving, and smoothing). The products then undergo cleaning, chemical conversion membrane treatment, and uniform powder spraying.
What measures are taken during final inspection and shipping (FQC/OQC)?
Both FQC and OQC inspections utilize calipers, projection systems, needle gauges, and tooth gauges to inspect dimensions, appearance, and packaging. A key precaution is verifying that all measuring tools are within their calibration period and fully conform to SIP and customer requirements.