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我厂从台湾省购进两台挤压机,其挤压筒是内、外两层结构,内套是盛锭筒,过盈配合于外套中.内套材质是4Cr_5MoSiV_1.外套材质稍软些,其外径和长度均约700毫米.挤压筒前端与模具是平面接触.外套装在保温箱筒里,用电热管预热(300～450℃、6～8小时).挤压筒内套承受着高温(400～450℃)、高压(2.5～13.0兆帕)、频繁胀缩和挤压冲击,因工作条件相当恶劣,致使挤压筒内套容易损坏和挤裂.
I plant from Taiwan Province purchased two extruders, the extrusion tube is inside and outside the two-tier structure, the inner sleeve is ingot tube, interference fit in the jacket. Inner material is 4Cr_5MoSiV_1. , Its outer diameter and length are about 700 mm. The front end of the extrusion barrel is in flat contact with the mold. The outer casing is mounted in a thermal insulation barrel and preheated with an electric heating tube (300-450 ° C., 6-8 hours). Set of high temperature (400 ~ 450 ℃), high pressure (2.5 ~ 13.0 MPa), frequent expansion and contraction and extrusion impact, due to very poor working conditions, resulting in easy extrusion tube crushing and crushing.