{
  "_meta": {
    "desc": "材料分族表（P10-06）：把切削特性差别不大的材料归为一族，用于按族匹配 Vc/fz/ap/ae 参考区间",
    "usage": "数值为参考区间，不替代试切；首件必须空跑或小切深验证",
    "source": "刀具厂商样本参考区间（Tungaloy 立铣刀样本 / OSG、Ingersoll 切削数据手册）"
  },
  "AL": {
    "name": "铝及铝合金",
    "iso": "N",
    "materials": ["6061", "6063", "7075", "5052", "5083", "LY12", "ADC12"],
    "hardness": "HB 60-120",
    "vc": [200, 500],
    "fz": [0.05, 0.12],
    "ap_D": [1.0, 2.0],
    "ae_D": [0.3, 0.6],
    "note": "易粘刀，务必大流量冷却；7075 取区间中上",
    "source": "刀具厂商样本参考区间（Tungaloy 立铣刀样本 / OSG、Ingersoll 切削数据手册）"
  },
  "ST": {
    "name": "普通碳钢/软态模具钢",
    "iso": "P",
    "materials": ["45#", "Q235", "S50C", "P20", "718", "738", "2738", "1045", "S136(退火)"],
    "hardness": "HB 150-250",
    "vc": [100, 180],
    "fz": [0.05, 0.10],
    "ap_D": [0.8, 1.0],
    "ae_D": [0.3, 0.5],
    "source": "刀具厂商样本参考区间（Tungaloy 立铣刀样本 / OSG、Ingersoll 切削数据手册）"
  },
  "STH": {
    "name": "预硬模具钢",
    "iso": "P",
    "materials": ["NAK80", "718H", "738H", "2316", "2738H", "P20H", "S136H"],
    "hardness": "HB 260-330",
    "vc": [70, 120],
    "fz": [0.03, 0.08],
    "ap_D": [0.5, 1.0],
    "ae_D": [0.2, 0.4],
    "note": "预硬状态，ap 不要照搬软钢",
    "source": "刀具厂商样本参考区间（Tungaloy 立铣刀样本 / OSG、Ingersoll 切削数据手册）"
  },
  "SS": {
    "name": "不锈钢",
    "iso": "M",
    "materials": ["304", "316", "316L", "321", "201", "17-4PH(固溶)"],
    "hardness": "HB 150-220",
    "vc": [40, 120],
    "fz": [0.03, 0.08],
    "ap_D": [0.5, 1.0],
    "ae_D": [0.2, 0.4],
    "note": "加工硬化，禁止小进给停留刮擦；304 常用 vc 60-90",
    "source": "刀具厂商样本参考区间（Tungaloy 立铣刀样本 / OSG、Ingersoll 切削数据手册）"
  },
  "HRC": {
    "name": "淬硬钢",
    "iso": "H",
    "materials": ["SKD11", "DC53", "CR12MoV", "SKD61(淬火)", "HRC45-62"],
    "hardness": "HRC 45-62",
    "vc": [30, 80],
    "fz": [0.02, 0.05],
    "ap_D": [0.1, 0.3],
    "ae_D": [0.05, 0.15],
    "note": "硬铣，小 ap 小 ae，多用球刀/圆鼻刀",
    "source": "刀具厂商样本参考区间（Tungaloy 立铣刀样本 / OSG、Ingersoll 切削数据手册）"
  },
  "CI": {
    "name": "铸铁",
    "iso": "K",
    "materials": ["HT250", "HT300", "QT600", "GG25"],
    "hardness": "HB 180-260",
    "vc": [100, 200],
    "fz": [0.05, 0.12],
    "ap_D": [1.0, 1.5],
    "ae_D": [0.3, 0.5],
    "note": "干切或微量冷却，注意粉尘",
    "source": "刀具厂商样本参考区间（Tungaloy 立铣刀样本 / OSG、Ingersoll 切削数据手册）"
  },
  "TI": {
    "name": "钛/高温合金",
    "iso": "S",
    "materials": ["TC4", "Ti-6Al-4V", "GH4169", "Inconel718"],
    "hardness": "HB 300-400",
    "vc": [30, 60],
    "fz": [0.02, 0.05],
    "ap_D": [0.3, 0.8],
    "ae_D": [0.1, 0.25],
    "note": "低转速大进给，严禁高速轻载",
    "source": "刀具厂商样本参考区间（Tungaloy 立铣刀样本 / OSG、Ingersoll 切削数据手册）"
  }
}