China Zinc Alloy Server Racks - Quality Cast Parts from Trusted Suppliers and Factory
Process
ZINC Die Casting
138T zinc die casting machine; ZA 3# material
- The furnace temperature is 420°±20°, and the material handle is 20±2 mm.
- Secondary materials cannot be used.
- Material composition must be tested to ensure it is suitable for production.
- The first piece must be confirmed.
- Verify quality of surface filling: no bulging, no cold isolation, and no shortage of materials in the column.
- Avoid mold stringing, sticking, or insufficient ejector protrusion.
- Ejector pin placement: concave 0-0.2mm for non-machined surfaces; convex 0-0.2mm for machined surfaces.
Remove Spout
- Pay attention to the surface; avoid damage and insufficient material usage.
- Manage size and appearance consistently.
IPQC Inspection
Deburring
Sharp angle position inverted R angle, deburring, non-machining surface top needle draping, grinding and connecting shape.
Shaping
PRODUCT BACK SHAPING
CNC
- A: Tapping two 6-32 teeth on each side face with a depth of 5.32+0.35mm/-0.15mm.
- B: Tapping four 6-32 teeth on front face with a depth of 8mm.
- Hold the product lightly when processing, so as not to bruise the product.
- Place products neatly and blow clean the surface of the jig.
- Refer to the requirements of the inspection specification for the appearance of the products.
- If there are any defects or other emergencies, please report to the superior immediately.
- Please pay attention to the processing and transportation process; do not touch or scratch the product surface.
Grinding
Remove product clamping line draping, surface particles, slag ladle, and gate residue.
100% Material & Appearance Inspection
Appearance Visual Inspection
- The surface of the product must be free of overcutting, sand holes, lack of material, burrs, and other undesirable phenomena.
- Via pass and stop gauge detection.
- Check the flatness of the product according to the drawings.
- Handle the product gently to prevent deformation.
IPQC Inspection
Visual inspection of appearance
Cleaning + Chemical Conversion Membrane + Drying
Surface Treatment Phase
Full Inspection of Appearance + Packaging
Comprehensive inspection of products and packaging.
- 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 pass-and-stop inspection.
- The product is placed in the knife card, covered with flat cardboard on the upper layer, and then packaged.
FQC Exam
Transportation
Logistics & Shipment Prep
- Confirm that the quantity matches the order.
- Label and stamp the outer box.
- Send reports on shipments.
OQC Shipping Inspection
Frequently Asked Questions
Our process utilizes a 138T zinc die casting machine and ZA 3# material. The furnace temperature is strictly maintained at 420°±20° with a material handle of 20±2 mm. Secondary materials are strictly prohibited to ensure maximum structural integrity.
IPQC inspections are conducted at multiple stages using high-precision testing instruments including three CMM (Coordinate Measuring Machines), projectors, and calculators, alongside detailed visual evaluations to verify dimensions directly against the design drawings.
We perform manual and mechanical deburring/grinding using files, wind grinders, and 120# sandpaper. The sharp angle positions are inverted to R angles to eliminate sharp corners, ensure all burrs are cleanly removed, and smooth out the mold closing lines.
Operators must handle the products gently to avoid bruising or scratching. The jig surfaces are continuously blown clean, products are organized neatly, and all tooth patterns must strictly comply with pass-and-stop gauge inspections.
FQC and OQC inspections utilize calibrated calipers, projectors, pin gauges, and tooth gauges to double-check dimensions and packaging. We verify that all testing tools are within their calibration window and that the shipment fully meets both customer specifications and SIP quality standards.