DIY Fold-forming Tools: Wedge Punches and Hardwood Forming Blocks
自制折叠工装：楔冲与硬木成形砧
标签：自制工具, 楔冲, 硬木砧, 折缝
楔折的稳定重复依赖自制工装：楔冲用中碳钢车削，楔角 12–20°——角小折线锐利、角大折线圆润，工作端淬火到 HRC 50 后回火至蓝灰色防脆断。硬木成形砧选枫木或铁木，沿折线开半圆槽并涂蜂蜡润滑，展开前对折缝内侧均匀加压，可避免钢锤直击造成的局部减薄。0.8 mm 铜片配 15° 楔冲、每次进给 2 mm 逐步推进，折线直线度可控制在 0.2 mm/m 以内；批量复制同款折角时再按试折结果修楔面。
Repeatable wedge folds depend on self-made tooling: turn wedge punches from medium-carbon steel at a 12–20° included angle—sharper angles give crisp creases, wider ones rounder lines—and harden the working end to HRC 50, tempering to blue-grey against snapping. For the forming block use maple or lignum vitae with a half-round groove along the fold line, waxed with beeswax; pressing the seam inner face evenly before opening avoids the local thinning of direct steel hammer blows. On 0.8 mm copper a 15° wedge fed 2 mm per pass holds crease straightness within 0.2 mm/m; touch up the wedge faces after trial folds when replicating angles in batches.