Valsovkalash aslida bo‘ylama prokatkadir, chunki bu jarayon ularga sektorli shtamplar mahkamlangan ikkita bolg‘alash juvalari orasida amalga oshiriladi.Shakldor xomaki mahsulotni ko‘pincha shtampning xomaki tayyorlash jilg‘alarida olinadi: yoki ko‘p jilg‘ali bitta shtampda yoki shtampovkalash mashinalarida alohida o‘rnatilgan bir nechta bir jilg‘ali shtamplarda.Bolg‘alashning eng keng tarqalgan defektlari yoriqlar, qiyshayish, o‘lchamlarning talab darajasiga muvofiq bo‘lmasligi, strukturaviy defektlar va metallning hususiyatlaridir. Ko‘pchilik holatlarda bunday defektlarni ularni tayyorlash texnologiyasini to‘g‘ri loyihalashtirib bartaraf qilish mumkin.
The technological process of forging is developed based on the drawing of the part. One of the documents developed for the stamping technological process is the forging drawing, and based on it, drawings of dies and other equipment are made.