Die Casting Engineering Guide
ZAMAK 3 Zinc Die Casting and Hexavalent Pearl Chrome Plating Process Guide
A practical process-control guide for ZAMAK 3 zinc alloy die casting, machining, polishing, hexavalent pearl chrome plating and threaded insert assembly.
Process Scope
| Material | ZAMAK 3 zinc alloy die casting. |
|---|---|
| Surface finish | Hexavalent pearl chrome plating, subject to customer specification and target-market compliance review. |
| Process route | Die casting, degating, deburring, drilling and tapping, grinding and polishing, pearl chrome plating, threaded insert assembly, inspection and packing. |
| Engineering objective | Control casting integrity, machined-thread quality, polishing consistency, plating appearance and final assembly reliability in one process plan. |
Recommended Manufacturing Flow
Die castingDegatingDeburringDrilling and tappingGrinding and polishingHexavalent pearl chrome platingThreaded insert assemblyInspectionPacking
Key Control Points by Process Step
| Die casting | Control melt temperature, mold temperature, injection speed, venting and overflow layout to reduce cold shuts, shrinkage, pores and surface flow marks before finishing. |
|---|---|
| Degating | Remove gates without pulling material from the visible surface or damaging datum areas used for later drilling and polishing. |
| Deburring | Remove flash from parting lines, holes and edges while preserving functional edges, decorative contours and assembly clearance. |
| Drilling and tapping | Lock the drilling datum before polishing, control pilot-hole size and thread depth, and verify threads with go/no-go gauges before plating. |
| Grinding and polishing | Remove casting marks but avoid over-polishing, edge rounding, waviness and local dimension loss on decorative or mating surfaces. |
| Pearl chrome plating | Define approved color samples, brightness range, satin texture, adhesion requirement and visual-defect limits before batch production. |
| Threaded insert assembly | Assemble inserts after plating to avoid plating contamination on insert surfaces; control insertion depth, torque and perpendicularity. |
| Inspection and packing | Check dimensions, threads, appearance, plating defects, insert retention and packaging protection before shipment. |
Main Quality Risks
| Casting pores exposed after polishing | Improve mold venting, overflow position, pressure profile and reject criteria before plating. |
|---|---|
| Thread fit blocked after plating | Confirm whether threaded holes need masking, post-plating cleaning or thread gauge confirmation before insert assembly. |
| Pearl chrome color drift | Use master samples and lot-by-lot approval for tone, brightness and satin grain consistency. |
| Over-polishing | Set polishing fixtures, sanding sequence and protected edge areas so the part does not lose contour or fitting dimension. |
| Insert looseness | Control thread engagement, insert torque, insertion depth and final pull/torque verification according to customer drawings. |
RFQ and Production Documents
- 2D drawing with critical dimensions, threaded-hole specification and plating surface areas.
- 3D model or sample showing visible A-surfaces and non-visible assembly surfaces.
- Approved pearl chrome color sample or reference part.
- Thread insert type, material, installation method and torque requirement.
- Appearance inspection criteria, packaging requirements and target market compliance expectations.
Hexavalent chromium processes require customer approval, local environmental control, wastewater treatment and occupational safety management. For restricted applications, evaluate trivalent chrome or alternative surface finishes before mass production.
Need ZAMAK 3 die casting and plating process review?
Send drawings, threaded insert requirements, pearl chrome samples, inspection criteria and annual volume. XSD can review process risk before quotation and batch production.
压铸工程指南
ZAMAK 3 锌合金压铸与六价珍珠铬电镀工程指南
面向 ZAMAK 3 锌合金压铸、机加工、抛光、六价珍珠铬电镀和螺纹牙套装配的工艺控制指南。
工艺对象
| 材料 | ZAMAK 3 锌合金压铸。 |
|---|---|
| 表面处理 | 六价珍珠铬电镀，需按客户规范和目标市场要求确认是否适用。 |
| 工艺路线 | 压铸、去水口、去毛刺、钻孔攻牙、打磨抛光、电镀珍珠铬、组装螺纹牙套、检验、包装。 |
| 工程目标 | 把压铸缺陷、机加工螺纹、抛光一致性、电镀外观和最终装配可靠性放在同一套工艺控制计划里管理。 |
推荐制造流程
压铸去水口去毛刺钻孔攻牙打磨抛光六价珍珠铬电镀组装螺纹牙套检验包装
各工序关键控制点
| 压铸 | 控制锌液温度、模温、压射速度、排气和溢流，尽量在后处理前降低冷隔、缩水、气孔和流痕风险。 |
|---|---|
| 去水口 | 去除浇口时不能拉伤外观面，也不能破坏后续钻孔、抛光使用的定位基准。 |
| 去毛刺 | 清理分型线、孔口和边缘毛刺，同时保留功能边、外观轮廓和装配间隙。 |
| 钻孔攻牙 | 抛光前锁定加工基准，控制底孔、螺纹深度和垂直度，电镀前用通止规确认螺纹状态。 |
| 打磨抛光 | 去除压铸痕和加工痕，但避免过抛、塌边、波浪面和局部尺寸丢失。 |
| 珍珠铬电镀 | 批量前定义色板、亮度、砂感纹理、附着力要求和外观不良判定标准。 |
| 组装螺纹牙套 | 电镀后装配牙套，避免牙套表面被电镀污染；重点控制装入深度、扭矩和垂直度。 |
| 检验与包装 | 出货前确认尺寸、螺纹、外观、电镀缺陷、牙套牢固性和包装防护。 |
主要质量风险
| 抛光后暴露气孔 | 从模具排气、溢流位置、压射曲线和电镀前判退标准改善。 |
|---|---|
| 电镀后螺纹配合异常 | 确认螺纹孔是否需要遮蔽、镀后清理或镀后通止规复检。 |
| 珍珠铬色差 | 使用承认样和批次确认方式控制色调、亮度和砂感一致性。 |
| 打磨过度 | 规定治具、砂纸顺序和保护区域，避免棱线、轮廓和配合尺寸被磨掉。 |
| 牙套松动 | 按图纸确认螺纹啮合长度、牙套扭矩、装入深度和最终拉力/扭矩验证。 |
询价与量产资料
- 2D 图纸：标注关键尺寸、螺纹孔规格和电镀外观区域。
- 3D 模型或实物样：区分 A 面外观区和非外观装配区。
- 珍珠铬承认色板或参考样件。
- 螺纹牙套型号、材质、安装方式和扭矩要求。
- 外观检验标准、包装要求和目标市场合规要求。
六价铬相关工艺需要客户确认，并配套环保、废水处理和职业安全管理；若目标应用受限制，应在量产前评估三价铬或其他替代表面处理方案。
需要 ZAMAK 3 压铸与电镀工艺评审？
请发送图纸、螺纹牙套要求、珍珠铬样板、检验标准和年用量。XSD 可在报价和量产前协助评估工艺风险。