Hydraulic-assist Raising on a Press
液压辅助起凸：压床预成形
标签：液压起凸, 压床, 预成形, 效率
大件起凸先用液压机配窝模预成形到 70% 深度，再上砧手工收边精修，工时可缩短 50–60%。压床行程速度控制在 5–10 mm/s，聚氨酯垫（邵氏 A70，厚 30–50 mm）垫底防止局部减薄过度；每道次压下量 ≤ 板厚 15%，两道次之间必须退火。预成形坯料预留 10–15 mm 余量供手工起凸修正轮廓与锤纹取向。
Rough large raising jobs to 70% depth on a hydraulic press with a forming die, then finish over stakes by hand—cutting bench time 50–60%. Ram speed 5–10 mm/s with a polyurethane pad (Shore A70, 30–50 mm) underneath to avoid over-thinning; reduce no more than 15% of thickness per pass and anneal between passes. Leave 10–15 mm extra for hand raising to correct the outline and hammer-mark direction. ---