锌合金压铸技术规格与项目评审要点
XSD Precision engineering resource for Zinc Alloy Die Casting Technical Specification GB/T 13821-2023 and GB/T 13818-2024, covering TPMS buyer checks, validation points,.
专业判断
XSD Precision 以品牌商、服务商、方案提供商和问题解决专家的身份，为 TPMS 与汽车精密工程项目提供从需求评审、工程验证到交付准备的专业支持。
XSD Precision engineering resource for Zinc Alloy Die Casting Technical Specification GB/T 13821-2023 and GB/T 13818-2024, covering TPMS buyer checks, validation points,.
Material Specification
Material control should focus on alloy grade, controlled elements, impurity limits and melting stability. Composition affects strength, fluidity, aging deformation, corrosion behavior and long-term reliability.
- Common alloy grades include ZA3, ZA8 and ZA12; ZA8 aluminum content is typically 7.5%-8.5%, while ZA12 is typically 10.5%-12.0%.
- Aluminum affects strength and fluidity; ZA3 may use 3.8%-4.3%, while ZA8 may use 7.5%-8.5%.
- Copper may be controlled around 0.7%-1.1%; excessive copper increases brittleness risk.
- Magnesium may be controlled around 0.035%-0.06% to reduce intergranular corrosion, but excessive magnesium can increase hot cracking risk.
- Lead should be controlled at <=0.003% and cadmium at <=0.001% to reduce aging deformation, cracking and compliance risks.
Melting Process Control
A stable melting window is a prerequisite for zinc alloy die casting quality. Excessive temperature can accelerate iron crucible corrosion, introduce iron into the alloy and create hard particles that increase mold wear and surface defects.
- Initial melting temperature can be controlled at 435-440 deg C.
- After complete melting, holding temperature can be reduced to 420-430 deg C to reduce aluminum and magnesium burning loss and zinc dross.
- When temperature exceeds 450 deg C, watch for iron contamination, hard particles and mold wear.
- Inert gas protection or vacuum melting is recommended to reduce hydrogen absorption and internal porosity.
Die Casting Process Window
The process window should cover injection pressure, filling time, mold temperature, release agent, vacuum assistance and feeding stability. Thin-wall, functional and cosmetic parts require stronger control of filling speed, residual gas and temperature fluctuation.
| Item | Recommended Window / Checkpoint |
|---|---|
| Injection pressure | 45-50 kg/cm² to ensure sufficient filling of complex cavities. |
| Filling time | <=0.01 s; thin-wall parts require shorter filling time to reduce cold shut risk. |
| Mold preheating | 150-200 deg C; cold mold injection can cause cold marks or poor filling. |
| Release agent ratio | Water-based release agent can be mixed with water at around 1:200 to reduce VOC emissions. |
| Vacuum die casting | High-precision parts should use vacuum-assisted die casting and keep residual cavity pressure <=30 kPa. |
| Temperature stability | Central melting furnace plus automatic feeding can help keep pouring temperature deviation within +/-5 deg C. |
Quality Inspection Specification
GB/T 13821-2023 differentiates inspection requirements by casting type. For structural, functional and safety-related parts, internal quality should not depend only on visual and dimensional sampling; X-ray, industrial CT or other non-destructive inspection methods should be considered.
| Category | Application | Required Inspection Items |
|---|---|---|
| Class 1 | Structural or functional parts, such as automotive seat belt buckles. | Chemical composition, mechanical properties, dimensional tolerance, surface quality and internal quality. |
| Class 2 | General parts, such as decorative components. | Chemical composition, mechanical properties, dimensional tolerance and surface quality. |
- Internal quality inspection may use industrial CT and digital X-ray imaging to evaluate porosity and shrinkage defects.
- Pin-hole grading may be judged by defect quantity within a 1 cm² area.
- ZA8 tensile strength may reference >=280 MPa, with elongation after fracture >=10%.
- Brinell hardness should follow typical values in the standard appendix; ZA8 may reference 80-100 HBW.
- Dimensional tolerance can follow GB/T 6414-2017, with critical mating surfaces managed at CT4 precision grade where required.
Application Requirements
- Automotive applications such as seat belt buckles and door lock housings should focus on salt spray testing, internal shrinkage and critical mating dimension stability.
- Automotive safety-related parts may reference GB/T 10125-2021 salt spray testing, with typical requirements reaching >=96 hours.
- Electronics applications such as 5G base station shielding covers should review electromagnetic shielding and high-thermal-conductivity zinc alloy requirements.
- High-thermal-conductivity zinc alloy can be evaluated for applications requiring thermal conductivity >=120 W/m·K.
Management Priorities After the Standard Upgrade
- Older, vague quality-assurance clauses are replaced by more specific inspection rules and nonconforming product handling processes.
- Chemical composition limits are broadly compatible with ASTM B86-19, supporting export and international project communication.
- Restrictions on harmful elements such as lead and cadmium are clearer, supporting RoHS and ELV compliance review.
- Manufacturers should update inspection equipment and optimize process windows according to typical parameters in the GB/T 13821-2023 appendix.
For new energy vehicles, 5G communication and automotive safety parts, vacuum die casting, industrial CT / X-ray inspection and a complete material-process-inspection loop are no longer optional extras. They are becoming quality-entry conditions.
Need zinc alloy die casting project review or quality documentation support?
Send drawings, alloy grade, key dimensions, annual volume and inspection requirements. XSD can help review DFM risks, die casting process windows and quality documentation.
如需结合具体车型、产品型号、验证目标或制造准备要求进行评估，请向 XSD Precision 提供项目资料、图纸、规格、目标市场和验证边界。
提交项目资料与 RFQ资料适用边界与项目输入
本模块用于帮助读者将公开资料转化为可评审的项目输入，同时明确官网公开信息与受控项目文件的管理边界。
适用对象
面向汽车精密工程项目的采购、工程、质量、项目管理和供应链团队：用于在 RFQ 或量产准备前建立可审查的输入基础。
项目输入
2D / 3D 图纸、材料牌号、公差、表面处理、CTQ、工装检具、检验计划、样品验证、数量和交付条件。
输出边界
官网公开资料说明工程方法、质量边界和制造准备路径；客户图纸、规格版本、工艺参数、成本模型、检测数据和批准证据按 XSD Precision 工程文件与项目资料受控管理体系执行。