DIY Drawing Dies: Epoxy & Kirksite
环氧与锌合金简易拉深模自制
标签：自制模具, 环氧, 锌合金, 低成本打样
小批量深冲的两条省模路线：①环氧模——以钢凸模包脱模布作母型，环氧树脂混铝粉（体积比 3:1）浇注凹模，固化 24 h 后 60 °C 后固化 4 h，表面硬度可达邵氏 D85，适合 0.5–0.8 mm 紫铜 50 件以内打样，压边圈仍须钢制；②锌合金模（Kirksite）——Zn-Al4 合金 380 °C 铸入砂型，车加工后硬度 HB 100–120，可冲 0.5–1.0 mm 铜带 500–2000 件，模具成本约为 Cr12MoV 钢模的 1/4。锌模单边间隙按料厚 8% 钳配，磨损后可回炉重铸。
Two budget tooling routes for short-run drawing: (1) epoxy dies — cast the die cavity in epoxy filled with aluminium powder (3:1 by volume) against a release-wrapped steel punch, cure 24 h then post-cure 4 h at 60 °C; Shore-D 85 surfaces handle 0.5–0.8 mm copper for up to 50 prototypes, though the blank holder stays steel. (2) Kirksite — cast Zn-Al4 at 380 °C in a sand mould, machine, HB 100–120; good for 500–2,000 pieces of 0.5–1.0 mm strip at a quarter of Cr12MoV tooling cost. Fit clearance at 8% of gauge per side; worn kirksite remelts.