一種可以改善鋼管內(nèi)孔螺旋缺陷的冷拔模具

A Cold-drawing Die for Eliminating Steel Pipe Inner Surface Spiral Defect

摘要: 介紹了一種可以改善鋼管內(nèi)孔螺旋缺陷的新型冷拔模具。該模具利用金屬會自動流向阻力最小方向的變形原理，使鋼管內(nèi)孔金屬發(fā)生兩次周向流動，解決了鋼管內(nèi)孔的螺旋問題。新模具加工出來的鋼管壁厚均勻性更好，提高了鋼管內(nèi)表面質(zhì)量，消除了后續(xù)加工過程中液壓油缸缸筒的內(nèi)孔尺寸波動和油缸的內(nèi)孔螺旋現(xiàn)象，杜絕了油缸的抖動和發(fā)響情況。

Abstract: Elaborated here in the article is a newly-developed cold-drawing die to eliminate the steel pipe inner surface spiral defect. Based on the deformation principle that the metal naturally flows towards where the resistance is minimum,the die can make the inner surface metal of the pipe flows twice circumferentially so as to fix the said spiral defect problem. The steel pipe as processed with the said die has good wall thickness homogeneity,getting the surface quality improved,and thus eliminating the phenomenon of inner bore dimensional inconsistency of the hydraulic cylinder case,and the inner surface spiral defect of the cylinder proper as may occurring during the subsequent processing course.As a result the troubles of vibration and noise as made by the hydraulic cylinder are completely fixed.