CN104454852B - 一种永磁钕铁硼磁钢绝缘粘接的方法及专用挤压工装 - Google Patents
一种永磁钕铁硼磁钢绝缘粘接的方法及专用挤压工装 Download PDFInfo
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Abstract
本发明公开了一种永磁钕铁硼磁钢绝缘粘接的方法及专用挤压工装;其特点是,方法包括永磁钕铁硼磁钢表面处理、绝缘粘接剂涂覆、初步固化、二次固化及后加工工艺步骤;工装包括磁钢定位装置(4),磁钢定位装置(4)中间设中间导轨(5),上、下分别设上压板(6)和下压板(7),上压板(6)上的穿过孔位置分别与磁钢定位装置(4)和中间导轨(5)位置相对应,在磁钢定位装置(4)上设螺栓(3),螺栓(3)位于上压板(6)上方;采用两个初步固化的绝缘粘接胶层叠加,磁钢和磁钢之间不会接触,所以保证了绝缘性,提高了永磁体绝缘的可靠性。
Description
技术领域:
本发明涉及永磁钕铁硼磁钢粘接技术领域,具体地讲是一种永磁钕铁硼磁钢的绝缘粘接方法及专用挤压工装。
背景技术:
近年来,随着永磁钕铁硼磁钢在电机上的使用的增多,而对于高速运行的永磁电机,转子磁钢损耗已成为影响其可靠运行的一个关键因素,转子的散热效果差,磁钢在高速旋转产生的涡流损耗使转子温度升高会导致永磁体退磁。为了减少磁钢涡流损耗,将多片永磁钕铁硼磁钢粘接在一起,以此来降低磁钢的涡流损耗。
传统的粘接磁钢的方法一般为将玻璃珠加入粘接剂中进行混合,然后涂抹在钕铁硼磁钢上面,放入工装夹具中挤压,然后烘烤。使用该方法的缺点是加入玻璃珠降低了粘接剂的粘接特性,并且玻璃珠并不是尺寸统一的,粘接剂之间胶层很难保证均匀一致,并且胶缝通常会很大,在磁钢挤压过程中一些玻璃珠可能出现偏移,或压碎,很难保证胶缝之间的绝缘性,成功率很低,必须再次通过绝缘测试才能判断磁钢之间是否绝缘。
发明内容:
本发明的目的是克服上述已有技术的不足,而提供一种永磁钕铁硼磁钢绝缘粘接的方法。
本发明的另一目的是提供实现永磁钕铁硼磁钢绝缘粘接方法的专用挤压工装。
本发明主要解决现有的永磁钕铁硼磁钢之间绝缘粘接的方法胶缝厚度难以控制及绝缘性不能保证的问题。
本发明的技术方案:一种永磁钕铁硼磁钢绝缘粘接的方法,其特殊之处在于,包括如下工艺步骤:
a永磁钕铁硼磁钢进行表面脱脂、活化处理;
b绝缘粘接剂均匀涂覆在永磁钕铁硼磁钢需要粘接表面;
c绝缘粘接剂在T1温度下初步固化,初步固化温度T1为20℃~250℃,时间0.1h~24h,绝缘粘接胶层厚度为1~100μm;
d将永磁钕铁硼磁钢叠加在一起,使用专用的挤压工装进行固定位置,并在粘接方向施加压力,压力为0.1Mpa~10Mpa,并且在T2温度下进行高温固化,高温固化温度T2为150℃~350℃,固化时间为0.1h-12h;
e固化完成降到室温后,再次对粘接后的钕铁硼磁钢二次机械加工,做成目标尺寸,并进行喷涂镀层。
进一步的,a步骤所述的永磁钕铁硼磁钢为烧结永磁钕铁硼磁钢或经过重稀土扩散后的永磁钕铁硼磁钢。
进一步的,所述的重稀土包含Tb或Dy。
进一步的,a步骤所述的表面脱脂、活化处理为永磁钕铁硼磁钢经过磷化处理,然后使用酒精、石油脑、丙酮和异丙醇清理脱脂,一直到表面无锈蚀、油脂为止,然后经过低温离子清洗,进行表面活化。
进一步的,b步骤所述的绝缘粘接剂为热固性树脂。
进一步的,b步骤所述的涂覆方式包含喷涂、毛刷涂抹或滚筒。
进一步的,d步骤所述的叠加在一起的永磁钕铁硼磁钢间的绝缘粘接胶层是可控的,厚度为2μm~200μm。
进一步的,所述的钕铁硼磁钢可以粘接2-25片。
进一步的,e步骤所述的二次机械加工为线切割、多线切或切片机加工;所述的喷涂镀层厚度为8μm~50μm。
本发明的永磁钕铁硼磁钢绝缘粘接的方法的专用挤压工装,其特殊之处在于,包括磁钢定位装置,磁钢定位装置中间均匀设中间导轨,在磁钢定位装置上、下分别设上压板和下压板,上压板上设穿过孔,穿过孔的位置分别与磁钢定位装置和中间导轨位置相对应,在磁钢定位装置上设螺栓,螺栓位于上压板上方。
本发明所述的一种永磁钕铁硼磁钢绝缘粘接的方法及专用挤压工装与已有技术相比具有突出的实质性特点和显著进步,1、采用两个初步固化的绝缘粘接胶层叠加,磁钢和磁钢之间不会接触,所以保证了绝缘性,提高了永磁体绝缘的可靠性;2、初步固化的绝缘粘接胶层是可控的,操作容易。
附图说明:
图1是本发明的永磁钕铁硼磁钢绝缘粘接示意图;
图2是本发明的挤压工装的结构示意图。
图面说明:
1、永磁钕铁硼磁钢 2、绝缘胶层 3、螺栓 4、磁钢定位装置 5、中间导轨 6、上压板 7、下压板。
具体实施方式:
为了更好地理解与实施,下面结合实施例对本发明进行详细说明;所举实施例只用于解释本发明,并非用于限制本发明的范围。
实施例1,参见图2,加工制成磁钢定位装置4,在磁钢定位装置4中间均匀安装中间导轨5,中间导轨5≥1个,使在挤压过程中可以保证永磁钕铁硼磁钢不倾斜,整个接触面均匀受力,在磁钢定位装置4上、下分别安装上压板6和下压板7,上压板6上加工有穿过孔,穿过孔的位置分别与磁钢定位装置4和中间导轨5位置相对应,在磁钢定位装置4上安装螺栓3,螺栓3位于上压板6上方;形成本发明的专用挤压工装。
实施例2,参见图1,采用实施例1的装置,为了实现永磁钕铁硼磁钢之间通过绝缘胶缝进行粘接,而且要控制胶缝的厚度,永磁钕铁硼磁钢的绝缘粘接方法,依次包括以下的步骤:
将钕铁硼毛坯加工成方片类,永磁钕铁硼磁钢1为烧结永磁钕铁硼磁钢或经过重稀土扩散后的永磁钕铁硼磁钢,重稀土为Tb或Dy;后磷化处理,处理后尽量减少与外界接触,防止灰尘和油污的污染;
将永磁钕铁硼磁钢1使用脱脂溶液多次擦拭,脱脂溶液包括酒精、石油脑、丙酮、异丙醇,等擦拭至无锈、无油迹,放入低温等离子清洗机中,通入气体,气体可以为空气、氩气、氮气中的一种,处理时间≤10min,处理后,从低温等离子机中取出;
将永磁钕铁硼磁钢1水平放置,在磁钢需要粘接的表面涂覆一层绝缘粘接剂,绝缘粘接剂为热固性树脂,热固性树脂包含环氧树脂、酚醛树脂,可单用也可以混合;涂覆的方式可采用喷涂、毛刷涂抹或滚筒,在此处绝缘胶层2的厚度可以控制,通常一次涂覆的厚度为1-15μm,如果需要绝缘胶层2比较厚,可以采用多次喷涂,最高一直涂覆到100μm,涂覆完一面以后,放入烘箱初步固化,温度为T1,T1为20℃~250℃,时间0.1h~24h,粘接剂初步固化后将会凝固变硬,厚度为1~100μm,不再流淌,防止在粘接时因为挤压力大,磁钢之间粘接剂过稀从而溢出过多,或者出现挤压力不均衡,永磁钕铁硼磁钢片与片接触,从而影响绝缘性;磁钢的一面涂有绝缘粘接剂初步固化以后,可以将另外一面也涂覆绝缘粘接剂,采用同样的方式,涂覆一层粘接剂,并且初步固化处理;
将需要粘接的永磁钕铁硼磁钢1之间叠加,叠加的永磁钕铁硼磁钢1可以为2~25片,放入挤压工装,磁钢定位装置4,防止永磁钕铁硼磁钢1在挤压过程中出现偏移,挤压工装中间导轨5,主要是控制受力面水平下降上升,防止在挤压的过程中受力不均衡,出现有的地方粘接在一起,有的地方没有粘接在一起,永磁钕铁硼磁钢1放置好后,移动上压板6使其挤压在永磁钕铁硼磁钢1上面,通过扭矩扳手扭紧螺栓3,然后进行挤压,通过测试磁钢受到的压强为0.1Mpa~10Mpa是比较理想的,挤压力小于0.1MPa,挤压力过小会导致两层的绝缘胶层2不能结合在一起,挤压力大于10Mpa的时候,粘接剂形变很大;
将挤压工装和磁钢一起放入烘箱,高温固化温度T2为150℃~350℃,固化时间为0.1h-12h,在T2温度下粘接剂再次开始变软,并且胶的中间发生胶合反应,使磁钢粘接在一起,因为粘接剂已经有过一次初步固化;在挤压力和加热的过程中,并不会出现很大的形变和流淌,可以良好的控制中间胶缝的尺寸,并且保证粘接的永磁钕铁硼磁钢之间一定绝缘;
将粘接完的永磁钕铁硼磁钢和挤压工装一起取出,降温到室温情况下,将粘接完成的永磁钕铁硼磁钢取出,粘接以后的永磁钕铁硼磁钢并不是目标产品,再次进行使用线切割、多线切或切片机进行二次机械加工,加工后使用喷涂的方式在磁钢上面涂覆一层镀层,厚度8μm~50μm,镀层的材料为环氧树脂、酚醛树脂。
实施例3,选择烧结永磁钕铁硼磁钢,将永磁钕铁硼磁钢经过磷化处理,然后使用酒精、石油脑、丙酮和异丙醇清理脱脂,一直到表面无锈蚀、油脂为止,然后经过低温离子清洗,进行表面活化;在磁钕铁硼磁钢需要粘接表面均匀喷涂绝缘粘接剂,绝缘粘接剂环氧树脂,绝缘粘接剂在T1温度下初步固化,初步固化温度T1为20℃,时间24h,根据需要绝缘粘接胶层厚度为1μm;将2片永磁钕铁硼磁钢叠加在一起,叠加在一起的永磁钕铁硼磁钢间的绝缘粘接胶层厚度为2μm,使用实施例1的挤压工装进行固定位置,并在粘接方向施加压力,压力为0.1Mpa,并且在T2温度下进行高温固化,高温固化温度T2为150℃,固化时间为12h;固化完成降到室温后,再次对粘接后的钕铁硼磁钢进行线切割加工,做成目标尺寸,并进行喷涂镀层,镀层的材料为环氧树脂,镀层厚度为8μm。
实施例4,选择经过重稀土Tb扩散后的永磁钕铁硼磁钢,将永磁钕铁硼磁钢经过磷化处理,然后使用酒精、石油脑、丙酮和异丙醇清理脱脂,一直到表面无锈蚀、油脂为止,然后经过低温离子清洗,进行表面活化;在磁钕铁硼磁钢需要粘接表面均匀毛刷涂抹绝缘粘接剂,绝缘粘接剂酚醛树脂,绝缘粘接剂在T1温度下初步固化,初步固化温度T1为135℃,时间12h,根据需要绝缘粘接胶层厚度为50μm;将12片永磁钕铁硼磁钢叠加在一起,叠加在一起的永磁钕铁硼磁钢间的绝缘粘接胶层厚度为100μm,使用实施例1的挤压工装进行固定位置,并在粘接方向施加压力,压力为5Mpa,并且在T2温度下进行高温固化,高温固化温度T2为250℃,固化时间为6h;固化完成降到室温后,再次对粘接后的钕铁硼磁钢进行多线切加工,做成目标尺寸,并进行喷涂镀层,镀层的材料为酚醛树脂,镀层厚度为29μm。
实施例5,选择经过重稀土Dy扩散后的永磁钕铁硼磁钢,将永磁钕铁硼磁钢经过磷化处理,然后使用酒精、石油脑、丙酮和异丙醇清理脱脂,一直到表面无锈蚀、油脂为止,然后经过低温离子清洗,进行表面活化;在磁钕铁硼磁钢需要粘接表面均匀滚筒绝缘粘接剂,绝缘粘接剂环氧树脂和酚醛树脂的混合,绝缘粘接剂在T1温度下初步固化,初步固化温度T1为250℃,时间0.1h,根据需要绝缘粘接胶层厚度为100μm;将25片永磁钕铁硼磁钢叠加在一起,叠加在一起的永磁钕铁硼磁钢间的绝缘粘接胶层厚度为200μm,使用实施例1的挤压工装进行固定位置,并在粘接方向施加压力,压力为10Mpa,并且在T2温度下进行高温固化,高温固化温度T2为350℃,固化时间为0.1h;固化完成降到室温后,再次对粘接后的钕铁硼磁钢进行切片机加工,做成目标尺寸,并进行喷涂镀层,镀层的材料为酚醛树脂,镀层厚度为50μm。
Claims (9)
1.一种永磁钕铁硼磁钢绝缘粘接的方法,其特征在于,包括如下工艺步骤:
a永磁钕铁硼磁钢进行表面脱脂、活化处理;所述的表面脱脂、活化处理为永磁钕铁硼磁钢经过磷化处理,然后使用酒精、石油脑、丙酮和异丙醇清理脱脂,一直到表面无锈蚀、油脂为止,然后经过低温离子清洗,进行表面活化;
b绝缘粘接剂均匀涂覆在永磁钕铁硼磁钢需要粘接表面;
c绝缘粘接剂在T1温度下初步固化,初步固化温度T1为20℃~250℃,时间0.1h~24h,绝缘粘接胶层厚度为1~100μm;
d将永磁钕铁硼磁钢叠加在一起,使用专用的挤压工装进行固定位置,并在粘接方向施加压力,压力为0.1Mpa~10Mpa,并且在T2温度下进行高温固化,高温固化温度T2为150℃~350℃,固化时间为0.1h-12h;
e固化完成降到室温后,再次对粘接后的钕铁硼磁钢二次机械加工,做成目标尺寸,并进行喷涂镀层。
2.根据权利要求1所述的一种永磁钕铁硼磁钢绝缘粘接的方法,其特征在于,a步骤所述的永磁钕铁硼磁钢为烧结永磁钕铁硼磁钢或经过重稀土扩散后的永磁钕铁硼磁钢。
3.根据权利要求2所述的一种永磁钕铁硼磁钢绝缘粘接的方法,其特征在于,所述的重稀土包含Tb或Dy。
4.根据权利要求1所述的一种永磁钕铁硼磁钢绝缘粘接的方法,其特征在于,b步骤所述的绝缘粘接剂为热固性树脂。
5.根据权利要求1所述的一种永磁钕铁硼磁钢绝缘粘接的方法,其特征在于,b步骤所述的涂覆方式包含喷涂、毛刷涂抹或滚筒。
6.根据权利要求1所述的一种永磁钕铁硼磁钢绝缘粘接的方法,其特征在于,d步骤所述的叠加在一起的永磁钕铁硼磁钢间的绝缘粘接胶层是可控的,厚度为2μm~200μm。
7.根据权利要求1所述的一种永磁钕铁硼磁钢绝缘粘接的方法,其特征在于,所述的钕铁硼磁钢粘接2-25片。
8.根据权利要求1所述的一种永磁钕铁硼磁钢绝缘粘接的方法,其特征在于,e步骤所述的二次机械加工为线切割、多线切或切片机加工;所述的喷涂镀层厚度为8μm~50μm。
9.上述权利要求1-8任意一种永磁钕铁硼磁钢绝缘粘接的方法的专用挤压工装,其特征在于,包括磁钢定位装置(4),磁钢定位装置(4)中间均匀设中间导轨(5),在磁钢定位装置(4)上、下分别设上压板(6)和下压板(7),上压板(6)上设穿过孔,穿过孔的位置分别与磁钢定位装置(4)和中间导轨(5)位置相对应,在磁钢定位装置(4)上设螺栓(3),螺栓(3)位于上压板(6)上方。
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