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China OEM Zinc Alloy Die Cast CNC Machining Auto Spare Parts Suppliers - Custom Manufacturer Factory
Process
01
ZINC die casting
Specification & Materials
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.
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.
02
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.
b. Dimension control.
03
IPQC inspection
Testing Instruments
Three CMM, appearance visual evaluation, projection, Caliper
Precautions
Use measuring tools correctly and check dimensions according to drawings.
04
Deburring
Process Details
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.
b. Don't grind over cut
c. Hold the product lightly to prevent pressure injury or deformation.
05
IPQC inspection
Process Details
Visual inspection of appearance
Equipment
knife-edge ruler, shaping fixture, Rubber hammers, rubber pads
Note
Visual inspection of appearance, according to SIP
06
CNC (CNC machining + Full material inspection)
Process 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
b. Be careful not to scratch or burr the surface;
c. Through-hole tolerance within +/-0.1mm
07
IPQC inspection
Process Details
Needle Gauge Inspection
Note
Through-hole need to pass the needle gauge, according to SOP
08
Grinding
Process 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.
09
IPQC INSPECTION
Process Details
Visual inspection of appearance
10
oil-spraying (Sherwin-Williams paint)
Process Details
Sherwin-Williams surface painting process
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
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
Process Details
Post-painting quality verification
Note
a. Surface quality confirmation after oil spraying,
b. Hole need needle gauge sampling inspection
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.
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
Process Details
Logistics preparation and shipment
Note
a. Confirm that the quantity matches the order.
b. Label and stamp the outer box.
c. Send reports on shipments.
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 (FAQ)
What materials and machine parameters are used in your zinc die casting process?
We use a 138T zinc die casting machine and ZA 3# material. The furnace temperature is strictly maintained at 420°±20°, and the material handle is kept at 14±1 mm. Testing the material composition is mandatory before production to ensure suitability, and secondary materials are strictly prohibited.
How do you prevent defects during the deburring and grinding stages?
During deburring and grinding, operators use files, wind grinders, and 120# sandpaper. We enforce strict precautions: there must be no residual segment differences, over-cutting is forbidden, and R-angles must connect smoothly. Products are handled lightly to avoid pressure injuries and deformation.
What are the tolerances and requirements for CNC machining?
Our CNC process includes drilling a 1x ϕ2.0 through hole (through 2 sides) and a 3x ϕ3.0 through hole on the side. The tolerance for the through-hole must be within +/-0.1mm. Operators must ensure there is no over-cutting, no missed processing, and no scratches or burrs on the surface.
What standards apply to the oil-spraying process?
We use Sherwin-Williams paint for oil-spraying. The surface must be smooth without paint stripping, scratches, orange peel, particles, or inconsistent coloration. Color matching is strictly verified against the standard sample to ensure uniformity.
How is quality verified during IPQC, FQC, and OQC stages?
We utilize various testing instruments including CMMs, projectors, calipers, pin gauges, tooth gauges, and shaping fixtures. These tools are regularly verified to ensure they are within their calibration window. Inspections follow SIP, SOP, and customer requirements to confirm dimensional tolerances, hole parameters, and surface appearance.
What are your packaging and transportation protocols?
Each product is individually packed in a bubble bag and placed into a carton with dividers (knife cards/clapboards) to prevent surface scratches. During transportation, we confirm that the quantity matches the order, label and stamp the outer box, and send shipment reports to the client.