DIY Spinning Tools: Steel, Grinds & Heat Treatment
自制旋压刀：材料、刃形与热处理
标签：自制旋压刀, 热处理, 工具钢, 刃形, 工具评测
自制旋压刀经济路线：刀杆用 φ16–20 mm 45 钢圆棒，端部焊接 T8 或 M2 高速钢刀头后统一热处理。T8 淬火 780 °C 水冷、180 °C 回火，硬度 HRC 58–62；M2 需 1180 °C 盐浴淬火，工作室"烧红入油"的近似处理寿命打七折。刃形评测：碗形刀走大面效率最高，钩形刀收口不挂料，梳刀刮平旋纹最快。刀杆全长 600–800 mm 便于腋下支点借力，手柄段滚花防滑。全套自制成本 50–80 元，约为进口组合刀的十分之一。
Budget spinning tools: use φ16–20 mm 45-steel rod as the shaft and weld a T8 or M2 tip, then heat-treat as one. T8: quench from 780 °C in water, temper at 180 °C, HRC 58–62; M2 wants a 1180 °C salt-bath quench — the shop shortcut of oil-quenching from red heat costs you ~30% life. Grind review: bowl tools cover flats fastest, hooks close rims without catching, comb tools erase spin lines quickest. Make shafts 600–800 mm long for armpit leverage and knurl the grip. A full set costs ¥50–80 — roughly a tenth of imported tooling.