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China Suppliers OEM Zinc Alloy Die Cast Auto Spare Parts Factory for Custom CNC Machining
Process
1
ZINC die casting
Machine & Material
138T zinc die casting machine; ZA 3# material
Process Characteristics
- a. The furnace temperature is 420°±20°, and the material handle is 14±1 mm.
- b. Secondary materials can not be used.
- c. Material composition must be tested to ensure it is suitable for production.
- d. First piece confirmation is required after die-casting.
Precautions
- a. The surface filling quality needs to be confirmed. no bulging, no cold isolation, and no shortage of materials in the column.
- b. Pay attention to the surface and avoid mold sticking, mold drawing, or poor ejector pin protrusion.
- c. The ejector pin should be concave 0-0.2mm, while for machined surfaces, the ejector pin should be convex 0-0.2mm.
2
Remove WATER GAP
Tools
Stick / saw machine
Things to note
- a. Pay attention to the surface must not be crushed, lack of material
- b. Dimension control.
3
IPQC inspection
Testing Instruments
Three CMM, appearance visual evaluation, projection, Caliper
Precautions
Use measuring tools correctly and check dimensions according to drawings.
4
Deburring
Description
Sharp angle position inverted R angle, deburring, non-machining surface top needle draping, grinding and connecting shape.
Equipment
File, Wind mill, 120# sandpaper
Note
- a. No residual segment difference
- b. Don't grind over cut
- c. Hold the product lightly to prevent pressure injury or deformation.
5
IPQC inspection
Method
Visual inspection of appearance
Equipment
knife-edge ruler, shaping fixture, Rubber hammers, rubber pads
Note
Visual inspection of appearance, according to SIP
6
CNC (CNC machining + Full material inspection)
Processing Details
Drilling 1x ϕ2.0 through hole (through 2 sides), drilling 3x ϕ3.0 through hole on the side
Equipment
Automatic drilling and tapping machine table, ϕ2.0 drills, CNC Drilling
Note
- a. Do not over-cut or miss processing;
- b. Be careful not to scratch or burr the surface;
- c. Through-hole tolerance within +/-0.1mm
7
IPQC inspection
Method
Needle Gauge Inspection
Note
Through-hole need to pass the needle gauge, according to SOP
8
Grinding
Details
Sanding around and on the sides of the product
Equipment
wind 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.
9
IPQC INSPECTION
Method
Visual inspection of appearance
10
oil-spraying (Sherwin-Williams paint)
Process Type
Surface Coating / Painting
Note
- a. The surface is smooth, no different color or dirt
- b. The surface can not be orange peel, particles.
- c. The surface should not be scratched or stripped of paint.
- d. Color according to the sample, uniform and consistent
11
IPQC inspection
Quality Control
Post-coating inspection phase
Note
- a. Surface quality confirmation after oil spraying
- b. Hole need needle gauge sampling inspection
12
Full inspection of appearance + packaging
Equipment
Carton, knife card, clapboard, bubble bag
Note
- a. Appearance according to the sample inspection, the surface is not dirty, scratches, dents bad
- b. Each product is put into a bubble bag and put into the packing box.
13
FQC inspection
Test Tools
Calipers, projectors, pin gauges, tooth gauges, visual and packaging inspection
Note
Whether the measuring tool is within the calibration period.
14
Transportation
Logistics Phase
Final packaging and shipping preparation
Note
- a. Confirm that the quantity matches the order.
- b. Label and stamp the outer box.
- c. Send reports on shipments.
15
OQC shipping inspection
Testing Instruments
calipers, projectors, pin gauges, tooth gauges, outer packaging inspection, etc.
Note
If the measuring device is still within its calibration window. Whether it meets both customer and SIP requirements.
Frequently Asked Questions
What materials and equipment are used in your zinc die casting process?
We utilize a 138T zinc die casting machine combined with high-quality ZA 3# material. The furnace temperature is strictly maintained at 420°±20° with a material handle of 14±1 mm to ensure structural integrity and surface finish.
How do you ensure the dimensional accuracy of CNC machined holes?
During the CNC drilling process, we drill a 1x ϕ2.0 through hole and 3x ϕ3.0 side through holes. The tolerances are tightly controlled within +/-0.1mm, and every batch undergoes mandatory IPQC needle gauge inspections according to standard operating procedures (SOP).
What type of paint is used for the oil-spraying process, and how is quality controlled?
We use premium Sherwin-Williams paint. Quality controls ensure the surface is perfectly smooth, free from orange peel, paint particles, scratches, or dirt, and matches the color sample uniformly.
What measurement instruments are used for FQC and OQC inspections?
Our quality control teams use calibrated instruments including calipers, projectors, pin gauges, tooth gauges, and three-coordinate measuring machines (CMM) to ensure all components meet the exact dimensions specified in the technical drawings.
How are the finished parts protected during packaging and transportation?
After a full visual and dimensional inspection, each individual product is placed inside a protective bubble bag. They are then organized inside secure cartons using knife cards and clapboard dividers to prevent any surface scratches or impact damage during transit.