CN2296008Y - 一种铁素体含量的无损检测探头 - Google Patents

一种铁素体含量的无损检测探头 Download PDF

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Publication number
CN2296008Y
CN2296008Y CN 97219128 CN97219128U CN2296008Y CN 2296008 Y CN2296008 Y CN 2296008Y CN 97219128 CN97219128 CN 97219128 CN 97219128 U CN97219128 U CN 97219128U CN 2296008 Y CN2296008 Y CN 2296008Y
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utility
model
probe
permanent magnet
ferrite content
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王会民
董瑞琪
李依依
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Institute of Metal Research of CAS
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Institute of Metal Research of CAS
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Abstract

一种铁素体含量的无损检测探头,其特征在于该探头由永磁体、外套导磁体外壳构成磁路,外壳端部凸出并留有缝隙,其间设置磁敏元件。本实用新型不象现行涡流法那样影响因素多,因而,信号处理简单易行,调节方便,经过标定,能达到较高的精度。

Description

一种铁素体含量的无损检测探头
本实用新型涉及检测技术,特别提供了一种对铁素体含量进行无损检测的探头。
在冶金及焊接领域,为保证某些产品质量,要测量和控制材质的铁素体含量。目前的测定方法大致可分为破坏性和非破坏性两种。利用磁天平能比较精确地测定铁素体含量,但它需要取样,是一种破坏性检测方法,适用范围受到限制。无损检测方法包括计算法,图表法和涡流法。计算法是根据有关各合金元素的含量把当量铁素体含量计算出来。由于合金的铁素体含量不仅取决于有关各合金元素含量,还于零件的热处理条件有密切关系,因而,计算结果并不可靠。图表法使用的图表是根据计算法的结果绘制的。这两种方法均以已知有关各合金元素含量为前提,结果同样不准确。涡流法是长期以来普遍使用的方法,它具有携带方便,性能可靠等优点。但是,涡流法受材料的电导率,磁导率,提高效应,激励信号频率等多种因素的影响,因而信号处理复杂,检测仪器调节旋钮多,操作步骤繁琐。
本实用新型的目的在于提供一种铁素体含量的无损检测探头,其原理简单,影响因素少,因而信号易于处理,仪器调节简单。
本实用新型提供了一种铁素体含量的无损检测探头,其特征在于该探头由永磁体(1)、外套导磁体外壳(2)构成磁路,外壳(2)前端部凸出并留有缝隙,其间设置磁敏元件(3)。永磁体(1)立式放置,磁敏元件(3)卧式放置,或永磁体(1)卧式放置,磁敏元件(3)立式放置。众所周知,处于静磁场中的铁磁性材料会被强烈磁化,从而引起铁磁性材料附近的磁场畸变。待测件的铁磁性材料含量越大,磁化强度越大,引起的磁场畸变也越大,因而,磁场畸变程度间接反映了铁素体含量,如图1所示。如果用一磁敏元件,测出磁场强度增量与铁素体含量增量的关系,并用现有铁素体含量测定仪或已知铁素体含量的试样标定仪表,就可以制造一台铁素体含量测定仪。本实用新型正是基于这一基本原理设计的,显然,本实用新型不象现行涡流法那样影响因素多,因而,信号处理简单易行,调节方便,经过标定,能达到较高的精度。
下面结合附图通过实施例详述本实用新型。
附图1磁场畸变与铁素体含量的关系曲线。
附图2立式永磁体探头结构原理图。
附图3卧式永磁体探头结构原理图。
实施例
如图2所示,铁素体含量的无损检测探头,由永磁体(1)立式放置,与导磁体外壳(2)构成磁路,外壳(2)端部凸出并留有缝隙,其间卧式放置设置磁敏元件(3)。
实施例
如图3所示,与实施例1不同的是永磁体(1)卧式放置,磁敏元件(3)立式放置。

Claims (3)

1.一种铁素体含量的无损检测探头,其特征在于该探头由永磁体(1)、外套导磁体外壳(2)构成磁路,外壳(2)端部凸出并留有缝隙,其间设置磁敏元件(3)。
2.按照权利要求1所述铁素体含量的无损检测探头,其特征在于:永磁体(1)立式放置,磁敏元件(3)卧式放置。
3.按照权利要求1所述铁素体含量的无损检测探头,其特征在于:永磁体(1)卧式放置,磁敏元件(3)立式放置。
CN 97219128 1997-07-03 1997-07-03 一种铁素体含量的无损检测探头 Expired - Fee Related CN2296008Y (zh)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101283271B (zh) * 2005-10-11 2011-07-13 Posco公司 测定金属材料相变率的在线测量装置
CN102628820A (zh) * 2012-03-26 2012-08-08 梅州五指石科技有限公司 汽车轮毂铁素体含量的信号融合检测方法及其检测系统
CN103134742A (zh) * 2011-11-23 2013-06-05 中国人民解放军海军工程大学 一种油液铁磁性磨粒现场检测装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101283271B (zh) * 2005-10-11 2011-07-13 Posco公司 测定金属材料相变率的在线测量装置
CN103134742A (zh) * 2011-11-23 2013-06-05 中国人民解放军海军工程大学 一种油液铁磁性磨粒现场检测装置
CN102628820A (zh) * 2012-03-26 2012-08-08 梅州五指石科技有限公司 汽车轮毂铁素体含量的信号融合检测方法及其检测系统

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