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Custom Zinc Alloy Die Cast Auto Spare Parts from China Suppliers - Precision CNC Machining Factory
Process Workflow
1
ZINC die casting
Specifications & Materials
138T zinc die casting machine; ZA 3# material
Process Characteristics
- The furnace temperature is 420°±20°, and the material handle is 14±1 mm.
- Secondary materials can not be used.
- Material composition must be tested to ensure it is suitable for production.
- 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
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.
5
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
6
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
7
IPQC inspection
Process Details
Needle Gauge Inspection
Note
Through-hole need to pass the needle gauge, according to SOP
8
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.
9
IPQC INSPECTION
Process Details
Visual inspection of appearance
10
Oil-spraying (Sherwin-Williams paint)
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
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
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 (FAQ)
Q1: What materials and machinery are used in your zinc die casting process?
We utilize a 138T zinc die casting machine and work with high-quality ZA 3# material. The furnace temperature is strictly monitored at 420°±20° to guarantee optimal casting parameters.
Q2: How do you ensure quality control during the production process?
Quality control is integrated at multiple stages through IPQC, FQC, and OQC inspections. We use advanced testing instruments including three CMM, projectors, calipers, and needle gauges to verify dimensions against drawings and comply with SIP and SOP guidelines.
Q3: What tolerances and surface standards do you achieve with CNC machining?
Our CNC drilling and tapping operations maintain a strict through-hole tolerance within +/-0.1mm. We actively monitor the process to ensure no over-cutting, surface scratches, or residual burrs occur.
Q4: What are the requirements for the oil-spraying finish?
We apply Sherwin-Williams paint to produce a smooth, uniform surface that matches the approved sample. The finish is carefully inspected to prevent orange peel, paint particles, scratches, or paint stripping.
Q5: How are the finished products packaged for transport?
Each fully inspected product is individually wrapped in a bubble bag and placed inside protective packaging boxes equipped with cartons, knife cards, and clapboards to prevent damage during transportation.