Dongguan Zhonghui Precision Die Casting Technology Co., Ltd.
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China OEM Aluminum Die Casting Heatsink for 5G Base Station - Trusted Suppliers & Reliable Factory Solutions

Discover high-quality products from reputable China suppliers and manufacturers. Our factory is dedicated to providing exceptional goods that meet international standards. With a focus on innovation and customer satisfaction, we ensure that our products are produced with precision and care. Whether you're looking for electronics, textiles, or machinery, our extensive range caters to diverse needs. Partner with us to experience unparalleled quality and service straight from the heart of China's manufacturing hub. Choose us as your trusted source for reliable products from experienced suppliers in the industry
  • Die Casting Machine Cold Chamber Alum Die Cast Machine 400T
  • Die Casting Method Precision Die Casting
  • Application communication base station
  • Machining CNC Machining
  • Material ADC12
  • Surface Chemical Conversion Membrane + Power spraying
  • Certification ISO 9001:2015
  • Capacity 500000 Pieces/Year
  • Transport Package Wooden Pallet
  • HS Code 7616991090
  • Origin Dong Guan of China
  • Shipment By airmail or by Sea
  • Due-date Two month
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Product Detail

Process

1

Aluminum die casting

Equipment & Material
Equipment: 400T aluminum die casting machine
Material: ADC12
Process Characteristics
  • Furnace temperature: 640°±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.
Aluminum die casting
2

Remove spout (Saw spout and knock out slag bag)

Equipment
Wooden Stick / sawing machine / labor protection gloves
Precautions
  • Pay attention to the surface without crushing or shortage of materials.
  • Control the appearance and size.
Remove spout process 1
Remove spout process 2
3

IPQC inspection

Test Tools
Caliper, projection, three-dimensional, visual inspection of appearance.
Precautions
Use measuring tools correctly and check dimensions according to drawings.
IPQC inspection 1
IPQC inspection 2
4

SHAPING

Process & Equipment
Process: Back shaping
Equipment: Cutting edge ruler, shaping tooling
Precautions
Within 0.2mm of the front plane of the product
Shaping process
5

IPQC inspection

Inspection Detail
Visual inspection of appearance
6

CNC

Process & Equipment
Process: Machining main Inlet, main Dump Port Face, Backside, Perforated Overbore
Equipment: CNC machine, flat-bottomed cutter, drill bit, tap processing fixture.
Precautions
  • Do not over-cut or miss processing;
  • Be careful not to scratch or burr the surface;
  • Ensure the finish of the processed surface is Ra1.6, and the size and shape tolerances.
CNC Machining 1
CNC Machining 2
7

100% material inspection

Inspection Detail
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.
8

Grinding

Process & Equipment
Process: The sharp corners of the product are chamfered, deburred, non-machined ejector pins are sharpened, and polished to smooth the appearance.
Equipment: Air grinder, 120# sandpaper
Note
No processing should be missed, no sharp corners or burrs should be removed, and the R corners should be connected smoothly.
Grinding process
9

IPQC inspection

Inspection Detail
Visual inspection of appearance
10

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;
Power spraying process
11

IPQC inspection + Special Characteristics Inspection

Inspection Detail
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.
12

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.
  • The tooth pattern must comply with the go – no go fixed gauge inspection;
  • The product is placed in the knife card, and then packaged.
13

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.
14

Shipping

Precautions
  • make sure the quantity is the same as order.
  • Label and stamp on the outer box
  • Provide a shipping report.
Shipping preparation
15

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 are the raw material standards and melting temperature limits for your aluminum die casting process?
We use high-grade ADC12 aluminum material and perform strict composition testing before production. The furnace temperature is strictly maintained at 640°±20° with a material handle of 20±2MM. To ensure structural integrity, secondary materials are strictly prohibited.
Q How do you ensure the precision and surface finish of CNC machined parts?
We utilize specialized CNC machines, flat-bottomed cutters, drill bits, and custom processing fixtures. We ensure the finished surface roughness meets Ra1.6, and perform strict dimensional tolerance checks to prevent over-cutting or surface scratches.
Q What quality checks are performed during the powder spraying stage?
Before spraying, parts undergo cleaning and chemical conversion membrane treatment. During spraying, we verify that the powder thickness is uniform, without accumulation or exposed bottom. The final color must match the sample uniformly with zero dirt or scratches.
Q How often is IPQC inspection performed during the manufacturing process?
IPQC (In-Process Quality Control) is conducted at multiple critical stages: post-die casting, after spout removal, following shaping, after CNC machining, post-grinding, and after powder spraying. This guarantees defects are caught early before proceeding to subsequent stages.
Q What inspection tools are used to verify the final product before shipping?
Our FQC and OQC teams utilize calibrated calipers, projection systems, three-dimensional measurement devices, needle gauges, and thread go/no-go gauges. We inspect the appearance, dimensions, and packaging to ensure full compliance with SIP and customer specifications.