高性能永磁式步进电动机用粘结钕铁硼多极磁环

本文介绍了高性能永磁式步进电动机用粘结钕铁硼多极磁环制备工艺中，（1）专用粘结剂的选择配制；（2）磁粉选择；（3）薄壁磁环自动压制成型；（4）表面防锈处理；（5）多极充磁和（6）磁环转子整体注塑成型等关键工艺的研究结果，并对结果进行了讨论。结果表明在解决了上述工艺问题后，粘结钕铁硼多极磁环的各项性能达到了高性能永磁式步进电动机对其的要求，已替代进口或使原有的电机升级换代。     

高性能永磁式步进电动机用粘结钕铁硼多级磁环

本文介绍了高性能就磁式步进电动机用粘结钕铁硼多级磁环制备工艺，（１）专用粘结剂的选择配制；（２）磁粉选择；（３）薄壁磁环自动压制成型；（４）表面防锈处理；（５）多极充磁和（６）磁环转子整体注塑成型等关键工艺的研究结果，并对结果进行了讨论。结果表明在解决了上述问题后，粘结钕铁硼多极磁环的各项性能达到了高性能永磁式步进电动机对其的要求，已替代进口或使原有的电机升级换代。     

粘结钕铁硼磁环在高性能永磁式步进电动机上的应用

钕铁硼粘结磁体是一种将钕铁硼磁粉与高分子树脂或塑料或低熔点合金及各种添加剂均匀混合,用模压、挤出或注射成形等方法制成的复合永磁材料。国内外对其机理的研究已比较深入,本课题仅就钕铁硼粘结磁体特别是应用于高性能永磁式步进电动机的粘结钕铁硼多极磁环的制备工艺中的关键问题进行了研究,内容包括：（１）专用粘结剂的选择;（２）磁粉选择;（３）薄壁磁环自动压制成形;（４）表面防锈处理方式的选择;（５）多极充磁;（６）磁环转子整体注射成形。结果表明：在解决了上述关键工艺问题后,粘结钕铁硼多极磁环已批量应用于高性能永磁式步进电动机,替代进口或使原有的电机升级换代     

LY11铝合金桨叶模锻件缺陷的分析及控制

分析了桨叶模锻件翘曲、不成型等缺陷的成因，并从加热、锻造、淬火等工艺参数的选择以及模具设计和加工等方面提出了预防产生缺陷的措施。     

2024高强度铝合金薄壁型材挤压工艺研究

文章研究采用正挤压方法对2024高强度铝合金薄壁型材进行挤压成型。主要从模具设计、挤压参数、淬火制度、淬火夹具制作及整形等方面进行调试,找出最合理的的挤压生产工艺使产品满足GJB2507A标准要求。     

铝型材挤压模浅析

从传统的思维模式无法解释分流模结构的角度出发，去探询型材的挤压成型和模具设计。将型材的概念抽象化，使设计模型更加容易理解，拓宽模具设计思路。     

专利信息

正多极电机转子涉及电机技术领域,尤其是一种多极电机转子。包括一体化注射成形的塑料磁环和嵌在磁环中的转轴,磁环为磁性材料注塑而成的一体结构,表面注射有至少2对磁极,磁极按相互颠倒的极性均匀排列在磁环体内。本发明为磁性材料1次成形的转子,转轴也作为1次成形中的嵌     

行业动态

包头稀土研究院一科研项目通过验收2012年,内蒙古科技厅和包头市科技局组织专家对包头稀土研究院功能材料中心承担的"一种磁环的多级聚合辐射取向成型制备方法专利技术转化"项目进行了验收。本项目是基于"一种磁环的多极聚合辐射取向成型制备方法"发明专利基础之上,通过对添加重稀土元素和其它元素工艺技术的研究,     

金属粉末注射成形计算机模拟充模过程的数值求解

文章采用有限元方法对金属粉末注射成形计算机模拟充模过程给出的方程组和边界条件进行了详细的数学求解分析，并给出了采用有限元软件ANSYS进行具体求解的过程，同时逐项分析如何运用一般模拟求解的主要输出结果来指导粉末注射成形模具设计和参数优化。     

UOE焊管成型质量水平及技术能力的提升

概述了管线管成品管型质量要求趋势,引申出了提升UOE成型过程能力和过程质量水平的具体要求。按质量指标和工艺流程顺序,分析了钢管UOE成型过程中的预弯边成型压塌和焊缝区域栗凸、高钢级薄壁钢板U成型能力不足、厚壁钢板O成型无开口、扩后椭圆、直度和直径精度控制难点,借助有限元仿真模型进行了模具和工艺的优化设计,经过实践验证了成型能力和管型质量水平的提升。研究结果可为焊管成型规格拓展提供参考。     

注射成形粘结钕铁硼磁体复合粉研究

磁体的注射成形是一种高效生产的近净成形技术。为了制备出具有较好综合性能的注射成形粘结钕铁硼永磁材料,研究了粘结剂对注射成形磁体的磁性能、加工性能及力学性能的影响;分析了硅烷系列的偶联剂、复合润滑剂和抗氧剂等添加剂对注射成形磁体性能的影响。结果表明,用MQP-B快淬钕铁硼磁粉和尼龙12粘结剂制备出了剩余磁感应强度为0.539 T,磁感矫顽力为345.37 k A/m,内禀矫顽力为681.02 k A/m,最大磁能积为47.37 k J/m3的注射成形钕铁硼磁体。     

Effect of Particle Size and Distribution of Rapidly Quenching NdFeBMagnetic Powder on Magnetic Properties of PolymerBonded NdFeBPermanent Magnet

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Manufacturing of Injection-Molded NdFeB Magnet with (BH)max111 kJ · m-3

The bonded NdFeB magnets prepared by injection molding meet with the development tendency of the magnet in small volume, light weight and high performance ,and have a good prospect.In this paper, a modified nylonbased binder was developed for powder injection molding of NdFeB bonded magnets.The effects of pretreatment of NdFeB anisotropic magnetic powder produced with HDDR processing on the anti-oxidation behaviors of powder and the final magnetic properties of the molded bonded magnets were studied.The optimal powder loading of 65 vol% was achieved with the modified binder.It was found that the properties of the bonded magnets were mainly affected by the powder surface pretreatment and the intensity of the applied alignment magnetic field during injection molding for a certain powder.Bonded magnets with remanence of 0.820 T, intrinsic coercivity of 1140.3 kA· m-1 and maximum energy product of 111 kJ · m-3 were produced with the optimal processing.     

粉末粒度分布对烧结钕铁硼微观结构形成的影响

烧结钕铁硼永磁材料是用粉末冶金方法制造的,其生产环节中的每道工序对磁体的最终性能都有相当大的影响。从微观结构上看,磁性能的高低主要是由于具体的微观结构不同造成的。而其中制粉环节粉末的粒度分布对最终产品微观结构的形成具有非常大的影响。采取一组实验,以探讨不同的粉末粒度分布对产品微观结构形成的影响。     

稀土永磁材料的生产应用及市场

介绍了近几年来我国稀土永磁材料的生产技术、品种、质量和产量发展状况;永磁品应用的新领域动向;在激烈竞争中磁品国内外市场贸易情报。目前我国已成为全球稀土永磁材料生产、应用和市场发展中心!根据永磁品发展中存在的问题,讨论了一些议题并提出了建议。     

Study on Fabrication Process of Anisotropic Injection Bonded Nd-Fe-B Magnets

This study is on the injection molding process for the fabricating anisotropic Nd-Fe-B bonded magnets. The effects of powder loading, particle size of the magnetic powder, polymer binder and the fabricating process on the magnetic and the mechanical properties of anisotropic Nd-Fe-B magnets were investigated. The proper powder loading, particle size and binder are 60%(vol%), 75–106 μm and PA 1010, respectively. The optimum condition for good magnetic properties of anisotropic injection bonded Nd-Fe-B magnets is mixing the binder and the chemicals in the temperature between 205–215 °C, injection temperature of 265 °C, the injection pressure of 5–6 MPa, the press time of 5 second, and molding temperature of 80 °C. The magnetic properties of anisotropic bonded Nd-Fe-B magnets made in above conditions from d-HDDR powder were: B_r=0.72 T, _iH_c=983 kA/m, (BH)_max=75 kJ/m^c.     

Investigation on the Moldability of HDDR NdFeB Bonded Magnet Prepared by Compression Molding Method

The phenomenon of uneven density distribution is inevitable in the process of preparing bonded magnets with complicated shape or with large geometric size by compression molding due to the friction among magnetic powder grains and between magnetic powder and the die wall, which reduces the pressure along the compression direction. In order to improve the density distribution homogeneity, the thin-wall rings with composition of HDDR NdFeB prepared by compression molding were selected as the investigated object in this study. It was systematically investigated on the effect of addition level of lubricants and the addition methods of lubricants and strengthener on magnet density, density distribution and on magnet strength. By means of joint addition of lubricants and strengthener, which increases the magnet density and improves the magnet density distribution under the precondition of keeping the magnet strength unreduced. Thus the moldability of the bonded magnets is improved.     

Nd-Fe-B永磁材料的粉末注射成形技术

介绍了目前采用的几种粉末注射成形用Nd-Fe-B磁粉的制备方法及特点;讨论了粘结剂、改性剂及磁场取向对注射成形Nd-Fe-B粘结剂磁体和烧结磁体最终磁性能的影响;指出了注射成形Nd-Fe-B磁体的现在以及潜在的应用市场。在此基础上,指出了今后开展研究工作的方向。     

Progress of Sm-Fe-N Anisotropic Magnets

A reduction and diffusion method (R/D) is used to make a mother alloy of Sm-Fe-N anisotropic magnets. Reduction of 0.5wt% of samarium content compared to the conventional powder increases magnetization. Milling condition and surface treatment improve the squareness of demagnetization curve, the aging property and the heat resistance. The maximum energy product of 292 kJ/m³ is obtained with the powder. High coercive force is maintainable even if the powder is exposed for 300h in 80 °C 90%RH. The maximum energy product of 141 kJ/m³ is obtained with an injection molded anisotropic magnet. The aging property estimated by irreversible flux loss is comparable to the conventional MQP-B magnets. The heat resistance temperature (T_−5%) at which die initial irreversible flux loss becomes −5% is 125-more than 150 °C for Sm-Fe-N magnets and 150–170 °C for hybrid magnets. The magnetic properties of bonded HDDR Nd-Fe-B magnet were improved by substituting for Nd-Fe-B powder with Sm-Fe-N powder. A new technology to make anisotropic bonded Sm-Fe-N thin cylinder magnets by an injection molding using unsaturated polyester (UP) resin was developed.