Dongguan Zhonghui Precision Die Casting Technology Co., Ltd.
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China OEM Precision Die Casting 5G Telecom Radiator Housing from Reliable Suppliers and Factory

Discover high-quality products from leading China Suppliers at our Factory. We specialize in manufacturing top-notch goods tailored to meet global standards. Our commitment to excellence ensures that every item produced reflects the finest craftsmanship and innovation. Partner with our China Factory to access unparalleled quality and competitive pricing. Experience the best in the industry with our dedicated team, ready to support your business needs and deliver exceptional results. Choose us as your trusted source for reliable products and elevate your market presence today
  • Die Casting Machine Cold Chamber Alum Die Casting Machine 400T
  • Die Casting Method Precision Die Casting
  • Application Communications Industry
  • Machining CNC Machining
  • Material ADC12
  • Surface Double-color spraying
  • Certification ISO 9001:2015
  • Customized Dispensing, Copper Tubing
  • 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

Manufacturing Process Flow

1

Aluminum die casting

Equipment & Material

400T aluminum die casting machine; ADC12 material

Process Characteristics
  • a. Material handle: 20±2mm, furnace temperature: 670°±20°;
  • b. The use of secondary items is not allowed;
  • c. Verify through testing that the material composition is suitable and can be manufactured;
  • d. After die casting, first piece confirmation is required.
Note
a. Verify the filling quality of the surface. It’s not the bulge, it’s not the cold insulation, it’s not the lack of material in the pillars.
b. Pay attention to the surface to prevent poor ejector pin crown, mold pulling or mold sticking.
c. For non-machined surfaces and machined surfaces, the ejector pins are concave by 0-0.2 mm. The ejector pin must have a convex shape of 0-0.2 mm.
2

Take out the nozzle (saw nozzle) and pull out the slag bag

Equipment

A wooden stick / sawing machine

Things to note
a. Pay attention to the surface and don't damage it or use insufficient material.
b. Adjust size and appearance
3

IPQC inspection (verify detailed dimensions in drawings)

Testing Instruments

Calipers, projection, three-dimensional modeling, visual appearance inspection

Precautions

Check dimensions against drawings and use accurate measuring equipment.

4

Product back plastic surgery

Tools

Hydraulic presses, forming tools and blade rulers

Precautions

Warning: The accuracy of the front of the product is within 0.25 mm.

5

CNC

Process Details
  • a: Use CNC processing to process the through-hole of the tooth hole, the end face of the inner cavity, and the end face of the peripheral heat dissipation tooth face.
  • b: Deburring: In order to make the product smooth in appearance, the sharp corners are chamfered and deburred, and the non-machined ejector pins are sharpened and polished.
  • c: Complete check

Tools & Equipment: Wind grinders, files, flat-bottom milling cutters, drill bits, tap processing fixtures, and 120# sandpaper

Note
a. Avoid over-cutting, leaving no sand holes, sharp edges, or missed processing; avoid scratches and burrs; and ensure smooth connection of the R corners.
b. Control dimensional and shape tolerances to ensure that the processed surface finish reaches Ra 0.8.
c. Regulation and non-regulation inspections.
d. Verify product is flat relative to drawing.
e. Handle items carefully to avoid deformation
6

Polishing (hand removal)

Process Details

(Remove surface particles, slag bags, gate residues, and product wire caps.)

Note

Make sure the mold closing line is connected smoothly and there is no leakage in processing. Also, avoid sharp corners and jagged edges.

7

Outsourcing

Process Details

Two-color spraying at different locations uses a combination of powder spraying and oil spraying.

Test Instruments: Appearance visual inspection combined with colorimeter, film thickness meter, salt spray tester, hundred grid tester, alcohol resistance test, pencil test

Note
a. No contrasting colors, dirt, exposed bottoms, dust accumulation, scratches or other issues; tinted and anti-bake fractals are clearly visible;
b. The color is completely consistent with the sample;
8

IQC incoming material inspection/IPQC inspection

Note
a. Verify surface condition after powder coating;
b. Holes must be randomly inspected using pin gauges, pass gauges, and stop gauges.
9

100% inspection (verify how powder spraying appears)

Process Details
  • a. 100% inspection of powder coated surfaces.
  • b. Conduct irregular inspections for the purpose of powder coating performance testing.
Precautions
a. There is no obvious color, dirt, exposed bottom, dust accumulation, scratches, etc. in the coloring and baking-resistant fractal areas;
b. The color exactly matches the sample.
10

Dispensing glue

The width and height are asymmetrically centered at 1.0±0.1, and glued to the designated strip area.

Tools

Dispensing jigs and machines

Note
a. The strips are even; they won't crack, pile up, pull, spill, deflect, blister, fall off, etc.
b. Verify whether the glue cannot adhere or regenerate well, whether the glue strength is optimal, etc.
11

Composition of accessories and components

Process Details
  • a. The assembly position of the heat dissipation copper bar corresponding to the glue assembly;
  • b. Fix the M2.5*5 screws of the sheet metal parts in the appropriate position and push the copper block to dissipate heat;

Elements:

  • SE4450 adhesive
  • Five copper heat sinks
  • Three metal plates
  • Six half-round screws, M2.5*5
Notes
a) Dispense glue into the copper row dispensing groove according to the sample;
Make sure there are no loose or slipping teeth and that the locking screw is in a stable position.
12

Drying

Carefully arrange items on the baking line into 2 columns and 7 rows, for a total of 14 items. Bake at 150°C for 30 minutes.

Equipment

Dryer

Note

Leave enough space between products, be careful not to touch the tunnel door, hold lightly to avoid any bruises;

13

100% inspection: 100% appearance + packaging inspection

Notes
a. Appearance needs to be checked based on samples. There should be no dents, scratches or other blemishes on the surface and the glue application should be smooth and flawless!
b. The tooth shape needs to match the pass gauge and stop gauge;
c. Put the product into the knife card, cover the top of the knife card with a flat cardboard and package it.
14

FQC inspection

Testing Instruments

Calipers, projectors, pin gauges, tooth gauges, visual and packaging inspection

Prepare for a rainy day

If the measuring device is still within its calibration window.

15

Transportation

Note
a. Confirm that the quantity matches the order.
b. Label and stamp the outer box.
c. Send reports on shipments.
16

OQC shipment inspection

Inspection Instruments

Calipers, projectors, tooth gauges, needle gauges, appearance, outer packaging inspection

Prepare for a rainy day

If the measuring device is still within its calibration window. Whether it meets both customer and SIP requirements.

Frequently Asked Questions (FAQ)

What raw materials and machinery are utilized in the initial die casting stage?

We utilize a 400T aluminum die casting machine with premium ADC12 material. The process operates under strict parameters, keeping the furnace temperature at 670°±20° and requiring first-piece confirmation post-casting.

How is precision and quality controlled during the CNC machining phase?

We maintain a surface finish of Ra 0.8 and shape tolerances through rigorous checks. The process requires avoiding over-cutting, leaving no sand holes or sharp edges, and verifying flatness relative to the technical drawings.

What testing instruments are used for quality inspections (IQC, IPQC, FQC, OQC)?

Quality assurance is conducted using a comprehensive suite of instruments including calipers, projectors, three-dimensional modeling, pin gauges, pass/stop gauges, colorimeters, film thickness meters, and salt spray testers.

What is the curing specification for the component assembly and glue dispensing?

After applying SE4450 adhesive and assembling the copper heat sinks and metal plates, the units are baked in a dryer. The drying process requires products to be arranged in 2 columns and 7 rows and baked at 150°C for 30 minutes.

How do you verify the quality of surface coating and outsourcing operations?

Outsourced two-color spraying combines powder and oil spraying. We verify surface appearance visually alongside instrument checks (e.g., film thickness, grid tests, and alcohol resistance tests) to ensure exact color matches and zero surface defects.