{ "slug": "inspection-methods", "title": "CNC 检测方法对比：CMM、NDT 与 PMI", "description": "十七种测量与无损检测方法，按几何能力、精度、成本等级、单件节拍、人员资质与报告证据逐项对比，并附 CMM 与 UT 计算实例及 FAI/PPAP 要求。", "lang": "zh", "tables": [ { "caption": "检测方法对比（17 种方法；成本等级为编辑部评定）", "columns": [ "方法", "可测量项（GD&T 范围）", "精度 / 量程", "成本等级", "单件节拍", "破坏性？", "操作者资质", "可检出缺陷", "标准", "来源" ], "rows": [ { "方法": "CMM, bridge (touch-trigger / scanning)", "可测量项（GD&T 范围）": "尺寸、位置度、平面度、圆度、垂直度、平行度、同轴度、轮廓度——完整 3D GD&T", "精度 / 量程": "MPE ±(1.7–2.5 + L/250–300) µm; high-end ±(0.6 + L/1000) µm; to ~1 m class", "成本等级": "5", "单件节拍": "3–15 min", "破坏性？": "否", "操作者资质": "ISO 10360 校准报告 + 熟悉 GD&T 的测量人员", "可检出缺陷": "任何几何偏差；测头探测无法发现内部孔洞", "标准": "ISO 10360-2; ASME B89.4.1", "来源": "S1–S5" }, { "方法": "Blue-light / laser 3D scanning", "可测量项（GD&T 范围）": "表面轮廓度、3D 最佳拟合、全场偏差图", "精度 / 量程": "point 0.017–0.05 mm; volumetric 0.02–0.1 mm", "成本等级": "4", "单件节拍": "1–4 min (scan + align)", "破坏性？": "否", "操作者资质": "中等；需网格化/对齐技能", "可检出缺陷": "整个表面的形状偏差；视线遮挡限制倒扣结构；内部型腔无法触及", "标准": "VDI/VDE 2634 Part 3", "来源": "S9, S10" }, { "方法": "Profile projector (optical comparator)", "可测量项（GD&T 范围）": "2D 轮廓、半径、角度、节距、2D 真实位置、边缘", "精度 / 量程": "±(1.5–2.5 + L/100) µm; magnification ±0.1%; stage 203 × 102 mm typ.", "成本等级": "2", "单件节拍": "15 s–2 min", "破坏性？": "否", "操作者资质": "低；需视差/边缘识别培训", "可检出缺陷": "2D 轮廓偏差、毛刺、螺纹牙型；不能测深度或粗糙度", "标准": "Mitutoyo PJ/PH specs", "来源": "S6–S8" }, { "方法": "Vision measuring machine (VMM)", "可测量项（GD&T 范围）": "2D 尺寸、位置、小特征、特征数量多", "精度 / 量程": "±(0.8–1.5) µm", "成本等级": "3", "单件节拍": "10–60 s auto", "破坏性？": "否", "操作者资质": "低–中等；编程一次，操作员即可运行", "可检出缺陷": "小型/扁平零件的 2D 几何；由边缘定义的特征", "标准": "Mitutoyo QV specs", "来源": "S6" }, { "方法": "Calipers", "可测量项（GD&T 范围）": "线性尺寸（外径/内径/深度/台阶）快速检查", "精度 / 量程": "±0.02–0.04 mm", "成本等级": "1", "单件节拍": "seconds", "破坏性？": "否", "操作者资质": "无（车间通用量具）", "可检出缺陷": "粗大尺寸错误；不适用于 GD&T", "标准": "ISO 13385-1 class", "来源": "S6" }, { "方法": "Outside micrometer", "可测量项（GD&T 范围）": "直径、厚度", "精度 / 量程": "±0.001–0.003 mm", "成本等级": "1", "单件节拍": "seconds", "破坏性？": "否", "操作者资质": "低", "可检出缺陷": "直径/厚度偏差；需研磨过的测量面", "标准": "ISO 3611", "来源": "S6" }, { "方法": "Height gauge on surface plate", "可测量项（GD&T 范围）": "台阶高度、1D 比较测量、划线", "精度 / 量程": "±0.003–0.008 mm", "成本等级": "1", "单件节拍": "< 1 min", "破坏性？": "否", "操作者资质": "低", "可检出缺陷": "高度/台阶误差；配杠杆表附件可测圆跳动", "标准": "Mitutoyo indicator class", "来源": "S6" }, { "方法": "Surface roughness tester (Ra/Rz stylus)", "可测量项（GD&T 范围）": "按 ISO 4287 的 Ra、Rz、Rt", "精度 / 量程": "±0.5–2% of reading; resolution 0.001 µm; a 2 µm tip cannot resolve features below about 4 µm", "成本等级": "1", "单件节拍": "30 s per trace", "破坏性？": "接触式但不损伤工件", "操作者资质": "低；需截止波长/滤波培训", "可检出缺陷": "表面纹理偏差；不能测形状", "标准": "ISO 4287; JIS B 0601", "来源": "S6" }, { "方法": "Hardness — Rockwell (HRB/HRC)", "可测量项（GD&T 范围）": "整体硬度（强度/热处理状态的替代指标）", "精度 / 量程": "±0.5 HRC bench class; loads 60/100/150 kgf", "成本等级": "1", "单件节拍": "< 1 min per indent", "破坏性？": "残留小压痕（对外观面属半破坏性）", "操作者资质": "低；需 ASTM E18 程序培训", "可检出缺陷": "热处理状态错误；软点；缺渗层", "标准": "ASTM E18 / ISO 6508", "来源": "S15, S16" }, { "方法": "Hardness — Brinell (HB)", "可测量项（GD&T 范围）": "粗糙/大型零件的整体硬度", "精度 / 量程": "10 mm WC ball, 500/3000 kgf, 15 s; best on castings/forgings", "成本等级": "1", "单件节拍": "about 1 min", "破坏性？": "可见压痕（比 HRC 大）", "操作者资质": "低", "可检出缺陷": "牌号混料（与预期 HB 不符）；调质状态", "标准": "ASTM E10 / ISO 6506", "来源": "S15, S16" }, { "方法": "Hardness — Vickers/Knoop micro (HV/HK)", "可测量项（GD&T 范围）": "渗层深度（CHD）、薄壁截面、涂层截面", "精度 / 量程": "loads 10 gf–10 kgf; lab method", "成本等级": "2", "单件节拍": "sample-prep dependent (minutes)", "破坏性？": "切割 + 抛光截面——对零件具有破坏性", "操作者资质": "中等（需金相制样）", "可检出缺陷": "渗层深度超差；脱碳", "标准": "ASTM E92/E384; ISO 6507", "来源": "S15, S16" }, { "方法": "Ultrasonic testing (UT, incl. PAUT/TOFD)", "可测量项（GD&T 范围）": "内部缺陷、壁厚、未熔合", "精度 / 量程": "1–5 MHz; penetration 100–300 mm; TOFD depth ±0.5 mm on 25 mm wall; finds tight cracks < 0.1 mm", "成本等级": "3", "单件节拍": "minutes per weld/joint", "破坏性？": "否", "操作者资质": "按 SNT-TC-1A / CP-189 / ISO 9712 的 ASNT Ⅱ级", "可检出缺陷": "内部裂纹、孔洞、未熔合（LOF）、夹杂、厚度减薄", "标准": "ASTM E428/E317; EN 1714; ASME Sec V; AMS 2632", "来源": "S11, S12" }, { "方法": "Magnetic particle testing (MT)", "可测量项（GD&T 范围）": "铁磁性零件表面及近表面裂纹", "精度 / 量程": "cracks below the 1.6 mm class band (A903 MT column); dry/wet, visible/fluorescent", "成本等级": "1", "单件节拍": "minutes", "破坏性？": "否（可能需退磁/清洗）", "操作者资质": "ASNT Ⅰ/Ⅱ级；航空航天按 NAS 410", "可检出缺陷": "磨削裂纹、疲劳裂纹、淬火裂纹；发纹", "标准": "ASTM E709; E1444 (aero); ISO 9934", "来源": "S13, S14, S24" }, { "方法": "Liquid penetrant testing (PT)", "可测量项（GD&T 范围）": "表面开口裂纹，适用任何材料（含有色金属）", "精度 / 量程": "pairs with MT on castings (MT below 1.6 mm, PT complementary); fluorescent more sensitive than visible", "成本等级": "1", "单件节拍": "15–60 min (dwell incl.)", "破坏性？": "否（残留可清洗）", "操作者资质": "ASNT Ⅰ/Ⅱ级", "可检出缺陷": "表面裂纹、开口气孔、折叠——包括铝材与奥氏体不锈钢", "标准": "ASTM E165/E1417", "来源": "S14" }, { "方法": "Radiographic testing (RT / X-ray)", "可测量项（GD&T 范围）": "内部孔洞、气孔、夹杂、焊缝熔深", "精度 / 量程": "volume defects by density contrast; thickness limit set by energy (typ. ≤ 100 mm steel; Co-60/linac beyond)", "成本等级": "4", "单件节拍": "10–30 min per exposure", "破坏性？": "否（对操作者有辐射危害，非对零件）", "操作者资质": "ASNT Ⅱ级；辐射安全许可证（视场地而定）", "可检出缺陷": "气孔、缩松、夹渣、未熔合（面状缺陷对角度敏感）", "标准": "ASTM E94; EN 17635; ASME Sec V", "来源": "S11" }, { "方法": "Salt-spray cabinet (NSS)", "可测量项（GD&T 范围）": "涂层耐腐蚀性", "精度 / 量程": "5% NaCl, 35 °C per ASTM B117 / ISO 9227; screening only", "成本等级": "2", "单件节拍": "24–1000+ h cabinet (parallel batch)", "破坏性？": "是（针对受试片；暴露会劣化表面处理）", "操作者资质": "低；需盐雾箱操作", "可检出缺陷": "涂层失效：出现白锈/红锈、起泡、蔓延", "标准": "ASTM B117; ISO 9227", "来源": "batch1 T3 table (caliber cross-reference)" }, { "方法": "PMI — OES spark / XRF / helium leak test", "可测量项（GD&T 范围）": "化学成分（OES 可测包括 C 在内的全元素；XRF 测不出 C）；密封性", "精度 / 量程": "OES 0.01% class (carbon weak — LECO combustion better); XRF portable non-destructive; helium MSD 5×10⁻¹²–5×10⁻¹³ Pa·m³/s, response < 1 s", "成本等级": "OES/XRF 2; helium 3", "单件节拍": "OES/XRF seconds; helium minutes", "破坏性？": "OES 会留下火花痕（轻微）；XRF 与氦检为非破坏性", "操作者资质": "OES/XRF 仪器培训 + PMI 程序；氦检真空操作培训", "可检出缺陷": "牌号混料、来料化学成分不符、漏率超限", "标准": "ASTM E415/E1086/E572; API RP 578; helium: vendor nameplate", "来源": "S20–S23" } ] }, { "caption": "要验证 ±0.02 mm 的位置度标注，需要多高精度的 CMM？", "columns": [ "检测目的", "主要方法", "快速筛查", "不适用 / 无效", "精度基准" ], "rows": [ { "检测目的": "Size + full GD&T (position/profile/flatness)", "主要方法": "CMM", "快速筛查": "blue-light scan (full profile fields)", "不适用 / 无效": "卡尺无法评价 GD&T", "精度基准": "MPE ±(1.7 + L/300) µm" }, { "检测目的": "Small 2D profile / thin deformable parts", "主要方法": "projector / VMM", "快速筛查": "—", "不适用 / 无效": "接触式测头会使薄壁变形", "精度基准": "±(1.5 + L/100) µm" }, { "检测目的": "Surface roughness Ra/Rz", "主要方法": "stylus roughness tester", "快速筛查": "—", "不适用 / 无效": "CMM 与投影仪测不了粗糙度", "精度基准": "±0.5–2% of reading" }, { "检测目的": "Heat-treat condition check", "主要方法": "Rockwell HRC (batch sampling)", "快速筛查": "Brinell (rough large parts)", "不适用 / 无效": "仅靠硬度无法判定牌号", "精度基准": "±0.5 HRC" }, { "检测目的": "Case depth (carburized/nitrided)", "主要方法": "Vickers micro section", "快速筛查": "—", "不适用 / 无效": "宏观硬度（HRC/HB）看不出渗层", "精度基准": "CHD per ISO 2639" }, { "检测目的": "Internal flaws (cracks/voids/LOF)", "主要方法": "UT incl. PAUT/TOFD", "快速筛查": "RT (best on volume defects)", "不适用 / 无效": "MT/PT 只能看到表面开口", "精度基准": "TOFD depth ±0.5 mm per 25 mm" }, { "检测目的": "Surface cracks (ferromagnetic)", "主要方法": "MT", "快速筛查": "PT (only option for non-ferromagnetic)", "不适用 / 无效": "UT 近场盲区会掩盖表面", "精度基准": "MT below the 1.6 mm class" }, { "检测目的": "Coating corrosion comparison", "主要方法": "NSS salt spray", "快速筛查": "—", "不适用 / 无效": "盐雾箱小时数 ≠ 户外寿命（ISO 10683）", "精度基准": "endpoint must state white vs red rust" }, { "检测目的": "Grade / mix-up verification (incoming)", "主要方法": "OES (carbon matters) or XRF (no carbon)", "快速筛查": "spark test (shop qualitative)", "不适用 / 无效": "XRF 看不到碳——无法区分 304 与 304L", "精度基准": "OES 0.01% class" }, { "检测目的": "Hermeticity", "主要方法": "helium mass spectrometry", "快速筛查": "pressure decay (coarse leaks)", "不适用 / 无效": "气泡法只能定位大漏", "精度基准": "5×10⁻¹² Pa·m³/s class" } ] }, { "caption": "卡尺能检查 GD&T 真实位置吗？", "columns": [ "手用量具", "精度", "实际能分辨的项目" ], "rows": [ { "手用量具": "Calipers", "精度": "±0.02–0.04 mm", "实际能分辨的项目": "外径/内径/深度/台阶线性尺寸快速检查——不涉 GD&T" }, { "手用量具": "Outside micrometer", "精度": "±0.001–0.003 mm", "实际能分辨的项目": "直径与厚度" }, { "手用量具": "Height gauge", "精度": "±0.003–0.008 mm", "实际能分辨的项目": "台阶高度；配杠杆表附件可测圆跳动" }, { "手用量具": "Stylus roughness tester", "精度": "±0.5–2% of reading", "实际能分辨的项目": "仅 Ra/Rz——不测形状，不测尺寸" } ] }, { "caption": "全尺寸 FAI 的 CMM 检测，每件要多久？", "columns": [ "工时 / 成本基准", "数值", "状态" ], "rows": [ { "工时 / 成本基准": "Bridge CMM cycle", "数值": "3–15 min per part", "状态": "已公开区间" }, { "工时 / 成本基准": "Landing-gear bushing case: 7 radii R0.15 ± 0.02 + stepped bore", "数值": "14 min per part", "状态": "来源案例" }, { "工时 / 成本基准": "Projector pre-screen", "数值": "under 90 s per part", "状态": "已公开" }, { "工时 / 成本基准": "CMM queue-time reduction from pre-screening", "数值": "scheduling-dependent (editorial estimate)", "状态": "无来源数据——有意替换原先无出处的说法" }, { "工时 / 成本基准": "CMM equipment anchor", "数值": "$215K class", "状态": "TCO 表" }, { "工时 / 成本基准": "Scanner equipment anchor", "数值": "$142K class", "状态": "TCO 表" }, { "工时 / 成本基准": "Projector equipment anchor", "数值": "$48.5K class", "状态": "TCO 表" } ] }, { "caption": "蓝光扫描能替代 CMM 做 GD&T 签核吗？", "columns": [ "扫描仪级别", "标称精度", "备注" ], "rows": [ { "扫描仪级别": "GOM Scan 1", "标称精度": "0.017 mm single point", "备注": "VDI/VDE 2634 第 3 部分计量标准" }, { "扫描仪级别": "ATOS Q", "标称精度": "0.02 mm class", "备注": "当前代际的额定值" }, { "扫描仪级别": "Handheld laser", "标称精度": "0.02 mm class", "备注": "进口工业级" }, { "扫描仪级别": "ATOS (2010 lab data)", "标称精度": "0.002–0.02 mm, single frame 1 s", "备注": "保留的旧款较宽区间，供参考" } ] }, { "caption": "车间现场的洛氏硬度试验有多准？", "columns": [ "方法", "分工", "标准" ], "rows": [ { "方法": "Rockwell (HRB/HRC)", "分工": "热处理件批量硬度验证", "标准": "ASTM E18 / ISO 6508" }, { "方法": "Brinell (HB)", "分工": "粗糙、大型零件：铸件与锻件", "标准": "ASTM E10 / ISO 6506" }, { "方法": "Vickers/Knoop micro (HV/HK)", "分工": "渗层深度（CHD）、薄壁截面、涂层——破坏性截面检测", "标准": "ASTM E92/E384 / ISO 6507" } ] }, { "caption": "超声检测能发现多深的裂纹？", "columns": [ "参数", "数值", "来源" ], "rows": [ { "参数": "Frequency band", "数值": "1–5 MHz conventional", "来源": "S11" }, { "参数": "Penetration in steel", "数值": "100–300 mm", "来源": "S11" }, { "参数": "TOFD depth sizing", "数值": "±0.5 mm on a 25 mm wall", "来源": "S11" }, { "参数": "Tight crack detection", "数值": "below 0.1 mm", "来源": "S11" }, { "参数": "Thin-material spec", "数值": "0.5–12.7 mm at 2.0–10.0 MHz", "来源": "S12" }, { "参数": "Wall-thickness formula", "数值": "5,850 m/s × 3.4 µs ÷ 2 = 9.94 mm", "来源": "S11" }, { "参数": "Qualification", "数值": "ASNT Level II (SNT-TC-1A / CP-189 / ISO 9712)", "来源": "S24" } ] }, { "caption": "客户为什么拒收铝支架上的磁粉检测？", "columns": [ "方法", "覆盖范围", "来源" ], "rows": [ { "方法": "MT", "覆盖范围": "铁磁性零件；可检出 1.6 mm 档以下的裂纹", "来源": "S13, S14" }, { "方法": "PT", "覆盖范围": "适用任何材料；铸件上 1.6 mm 以上由 PT 作为补充——这是分工，不是冲突", "来源": "S14" } ] }, { "caption": "XRF 能对来料验证什么？", "columns": [ "PMI 工具", "优势", "局限" ], "rows": [ { "PMI 工具": "XRF", "优势": "便携、非破坏、每读数几秒", "局限": "测不出碳" }, { "PMI 工具": "Spark OES", "优势": "全元素（含碳）0.01% 级", "局限": "留下小的火花痕；台式仪器" }, { "PMI 工具": "LIBS", "优势": "手持；快速筛查", "局限": "用于出具证书时精度低于 OES" }, { "PMI 工具": "Carbon (LEEC combustion)", "优势": "OES 处于临界时碳测定更准确", "局限": "破坏样品" }, { "PMI 工具": "Helium MSD leak test", "优势": "5×10⁻¹²–5×10⁻¹³ Pa·m³/s，响应 1 s 以内", "局限": "铭牌灵敏度，非方法保证值" } ] }, { "caption": "氦检漏的灵敏度有多高？", "columns": [ "口径", "灵敏度", "如何解读" ], "rows": [ { "口径": "Instrument nameplate (MSD)", "灵敏度": "5×10⁻¹²–5×10⁻¹³ Pa·m³/s, response < 1 s", "如何解读": "厂商高端级别（S22，来源为用户生成内容；按铭牌值记录）" }, { "口径": "Conservative method-level", "灵敏度": "10⁻⁹ Pa·m³/s order", "如何解读": "S23；可能描述的是整台装置而非检漏仪本身" }, { "口径": "Pressure decay / bubble", "灵敏度": "orders of magnitude coarser", "如何解读": "与容积和温度相关；无固定下限（已声明缺口）" } ] }, { "caption": "盐雾小时数能证明户外寿命吗？", "columns": [ "参数", "数值" ], "rows": [ { "参数": "Electrolyte", "数值": "5% NaCl solution" }, { "参数": "Cabinet temperature", "数值": "35 °C" }, { "参数": "Solution pH", "数值": "6.5–7.2" }, { "参数": "Collection rate", "数值": "1–2 mL per 80 cm² per hour" }, { "参数": "Meaning", "数值": "screening comparison — not outdoor service life" } ] }, { "caption": "哪些报告能证明供应商的检测能力？", "columns": [ "情景", "尺寸证据", "材料 / 工艺证据", "交付物" ], "rows": [ { "情景": "AS9102 full FAI (new part number)", "尺寸证据": "覆盖全部特性的 CMM 报告 + 气泡图（Form 3）", "材料 / 工艺证据": "MTR/CoC + 热处理/电镀/NDT 证书（Form 2）", "交付物": "Form 1 + 2 + 3 + 气泡图" }, { "情景": "AS9102 delta FAI (revision / machine / supplier change)", "尺寸证据": "仅复测受影响特性", "材料 / 工艺证据": "仅变更工序的证书", "交付物": "引用原始 FAIR 的差异 Form 3" }, { "情景": "PPAP Level 3 (automotive)", "尺寸证据": "尺寸报告 + MSA / 量具 R&R", "材料 / 工艺证据": "材料 / 性能试验报告", "交付物": "PSW + 18 项资料包，关键特性 Cpk ≥ 1.67" }, { "情景": "Buyer capability audit", "尺寸证据": "年度 ISO 10360 CMM 校准证书 + 17025 可溯源量具清单", "材料 / 工艺证据": "ASNT Ⅱ级证书 + 已批准的特种工艺供应商", "交付物": "一套资料即可覆盖大多数审核" } ] }, { "caption": "零件什么情况下需要重做全尺寸 FAI？", "columns": [ "触发条件", "FAI 范围" ], "rows": [ { "触发条件": "New part number", "FAI 范围": "全尺寸 FAI" }, { "触发条件": "Design change affecting fit, form or function", "FAI 范围": "全尺寸 FAI（或按约定做差异 FAI）" }, { "触发条件": "Process or supplier change", "FAI 范围": "对受影响特性做差异 FAI" }, { "触发条件": "Production lapse over two years", "FAI 范围": "按 AS9102 Rev C 做全尺寸或差异 FAI——与客户确认具体哪一种" }, { "触发条件": "Revision", "FAI 范围": "AS9102 Rev C，2023-06 发布" } ] }, { "caption": "Ø0.05 的位置度要求下，0.092 mm 的孔位读数真的超差吗？", "columns": [ "步骤", "项目", "数值", "备注" ], "rows": [ { "步骤": "1", "项目": "CMM MPE at L = 200 mm", "数值": "±(1.9 + 200/300) ≈ ±2.57 µm", "备注": "蔡司 Contura 级别规格（S4/S5）" }, { "步骤": "2", "项目": "Combined standard uncertainty u_c (k=1)", "数值": "√(6² + 4² + 5² + 3²) = √86 ≈ 9.3 µm", "备注": "测头 6 + 标尺 4 + 温度 5 + 装夹 3，方和根合成（S3 预算，数值单位 µm）" }, { "步骤": "3", "项目": "Expanded uncertainty U (k=2)", "数值": "≈ ±0.018 mm", "备注": "2 × u_c，按来源自身的 U(k=2) = ±0.018 mm 口径" }, { "步骤": "4", "项目": "Verdict", "数值": "0.092 − 0.018 = 0.074 mm > 0.025 mm", "备注": "两种口径下超差均成立——只有在界限附近才需争论（ISO 14253-1）" }, { "步骤": "5", "项目": "Fitting requirement", "数值": "≥ 16 points, least-squares cylinder; 3-point method amplifies 4.3×", "备注": "S3 验证做法" } ] }, { "caption": "怎样证明 Ø120 mm 的 4140 调质轴内部无裂纹？", "columns": [ "步骤", "项目", "数值" ], "rows": [ { "步骤": "1", "项目": "Method elimination", "数值": "MT/PT surface-only; RT needs high energy, insensitive to planar flaws" }, { "步骤": "2", "项目": "Frequency selection", "数值": "2–5 MHz (fine-grained forging); 0.5–12.7 mm thin stock per AMS 2632 at 2.0–10.0 MHz" }, { "步骤": "3", "项目": "Wall-thickness check", "数值": "5,850 m/s × 3.4 µs ÷ 2 = 9.94 mm" }, { "步骤": "4", "项目": "Acceptance caliber", "数值": "crack-like (planar) indications evaluated per ASME Sec V; pressure-boundary forgings typically zero tolerance" }, { "步骤": "5", "项目": "Personnel", "数值": "ASNT Level II; report bound to the day's calibration status" } ] } ] }