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本文针对在强磁场条件下模具材料的选择和工艺探讨。着重分析了各种无磁材料的工作特性和选用70Mnl5Cr2Al3V2WMo(下称70Mn15)作为铁氧体模具的依据及存在问题。该钢经多年应用,证明在强磁场下工作,模具的导磁率测定:≤1.005,达到无磁状态,奥氏体组织稳定。一、问题的提出随着磁性材料生产的发展,对磁场成型无磁模具的热处理工艺提出一定要求。在粉末或料浆的型腔模中,模具是如何工作的呢?当永磁铁氧体粉料装入模具时,先给它加一个小磁场,该磁场的持续时间是从装料、压制到退磁。称为常磁场,接着加脉冲磁场,作
This article aims at the selection of the material of the mold under the condition of strong magnetic field and the technology discussion. Focusing on the analysis of a variety of non-magnetic materials, the working characteristics and selection of 70Mnl5Cr2Al3V2WMo (hereinafter referred to as 70Mn15) as a ferrite mold basis and existing problems. After years of application of the steel to prove that the work in a strong magnetic field, the permeability of the mold determination: ≤ 1.005, to achieve non-magnetic state, austenitic tissue stability. First, the question raised With the development of magnetic materials production, magnetic field forming non-magnetic mold heat treatment process put forward certain requirements. How does the mold work in the cavity mold of powder or slurry? When the ferrite powder is loaded into the mold, a small magnetic field is applied to it, the duration of the magnetic field being from charging to pressing demagnetization. Called the constant magnetic field, followed by pulse magnetic field, for