Ekstensi
Extension or stroke - metode pengolahan logam, sing kasusun ing drawing workpiece liwat piranti khusus karo bolongan kalibrasi, diameter sing kurang saka diameter saka workpiece, salah siji saka operasi forging lan stamping. Ngidini sampeyan ngurangi diameter lan nambah dawa awal workpieces - pipa, bar, lan liya-liyane. Ekstensi biasane dilakokake ing penekan hidrolik dawa, nggunakake billet, diduweni dening jahitan non-lempitan.