ISO 8062 Tolerances for Investment Castings
ISO 8062 铸件公差与熔模铸造等级
标签：ISO 8062, 尺寸公差, CT等级, 验收标准
ISO 8062-3 定义铸件尺寸公差 CT1–CT16 级：熔模铸造青铜小件通常可达 CT4–CT6（100 mm 尺寸公差约 ±0.5–1.1 mm），明显优于砂型的 CT8–CT10。图纸应标注公差等级与基准面；熔模件拔模角可小至 0.5–1°。验收用三坐标测量或三维扫描比对，批产按等级抽检。陶瓷壳铸态表面粗糙度 Ra 3.2–6.3 µm 是常规水平，更高要求须安排抛光工序；国内等效标准为 GB/T 6414，出口合同常两者并列引用。
ISO 8062-3 defines casting tolerance grades CT1–CT16: investment-cast bronze parts typically reach CT4–CT6 (about ±0.5–1.1 mm at 100 mm), well inside sand casting's CT8–CT10. Drawings must state the grade and datums; draft angles can be as low as 0.5–1°. Acceptance uses CMM or 3D-scan comparison with sampling by grade. As-cast ceramic-shell surfaces sit around Ra 3.2–6.3 µm — tighter requirements call for a polishing operation. China's GB/T 6414 is equivalent, and export contracts commonly cite both.