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磁鐵制造過程中能否控制磁場(chǎng)強(qiáng)度_
3個(gè)回答 - 提問時(shí)間: 2012年07月27日[/####]答案: 一般的永磁體在生產(chǎn)時(shí)是沒有磁性的,都是在成型后通過充磁形成磁場(chǎng)的。充磁強(qiáng)度完全可以人為控制,不足可以再次充,太足可以退磁(用交流磁場(chǎng))。更多關(guān)于磁鐵制造過程及所需機(jī)器的問題>>
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磁鐵制造過程中能否控制磁場(chǎng)強(qiáng)度-學(xué)路網(wǎng)-學(xué)習(xí)路上 有我相伴
2017年10月12日-強(qiáng)磁鐵的制造過程制粉--壓制成型--燒結(jié)或粘接--機(jī)械加工成型磁鐵,可以用鐵充磁制造嗎磁鐵本是鐵合金或是有磁性相的合金,你可以認(rèn)為他是鐵但它不是你所認(rèn)為的...
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機(jī)械車間加工過程高清曝光!整個(gè)過程看著感覺真爽_網(wǎng)易視頻
[視頻]時(shí)長(zhǎng)01:27[/####][####]別眨眼!一臺(tái)機(jī)器每天可生產(chǎn)50000個(gè),紙杯的制造過程 超級(jí)工程 3'55" 汽車制造...將上千度銅水倒在磁鐵上,磁力會(huì)發(fā)生什么變化?結(jié)果不可思議 創(chuàng)新實(shí)驗(yàn)室 0'59...[/####]3g.163.com/v/video/VADSS...-快照...要求只用磁鐵,電池,線圈,求詳細(xì)制作過程,高懸賞。_...
1個(gè)回答 - 回答: 2015年12月30日 - 23人覺得有用[/####]答案: 1、銅線繞線圈,匝數(shù)越密效果越好; 2、磁鐵同極吸在電池的兩極,這是關(guān)鍵,記住,必須是同極,可以...更多關(guān)于磁鐵制造過程及所需機(jī)器的問題>>
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上海強(qiáng)力磁鐵生產(chǎn)過程與工序及工藝流程-筑龍博客
2014年2月12日-之后再切割成所需尺寸才能完成。這一過程總感覺像是在制作蛋糕。 當(dāng)然,在實(shí)際量產(chǎn)高品質(zhì)的釹鐵硼強(qiáng)力磁鐵時(shí)并非如此簡(jiǎn)單。不僅要將微粒統(tǒng)一為3~5μm...
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磁鐵的制造工藝流程是如何的_
2017年8月15日-回答:工藝流程:配料 → 熔煉制錠→ 制粉 → 壓型 → 燒結(jié)回火 → 磁性檢測(cè) → 磨加工 → 銷切加工 → 電鍍 → 成品。 其中配料是基礎(chǔ),燒結(jié)回火是關(guān)鍵...
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用釹磁鐵自制懸浮裝置,制造過程太簡(jiǎn)單,輕輕松松浮起一個(gè)人!
2018年6月28日-磁懸浮列車?yán)么盆F同性相斥,異性相吸的原理,使車體懸浮在距離軌道,約1厘米處騰空行駛,創(chuàng)造了近乎0高度空間飛行的奇跡。 一名美國(guó)小伙也想親身感受這...
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牛人教你用磁鐵制造一個(gè)屬于自己的發(fā)動(dòng)機(jī)
牛人教你用磁鐵制造一個(gè)屬于自己的發(fā)動(dòng)機(jī) 返回列表 下個(gè)視頻發(fā)動(dòng)機(jī)的原理,有這幾...6缸發(fā)動(dòng)機(jī)安裝全過程,過程非常嚴(yán)謹(jǐn),看完才恍然大悟! 籃球少年 02:40 ...
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電磁吸盤_電磁吸盤制作流程20t電動(dòng)磁力吸盤工作級(jí)別 -
其制作工藝如下1.選擇合適的材料進(jìn)行焊接或者鑄造底...圓臺(tái)平面磨床注意事項(xiàng)電磁吸盤重要的是看其所擁有...作業(yè)效率普通強(qiáng)力吸盤使用時(shí)需要大量的工件調(diào)整時(shí)間,...
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世邦講解磁鐵礦選礦生產(chǎn)工藝流程制砂機(jī)_
2018年7月30日-備受矚目的礦機(jī)制造品牌 www.shibangchina.com 世邦講解磁鐵礦選礦生產(chǎn)工藝流程制砂機(jī)磁鐵礦選礦工藝是一種很重要的選礦工藝, 世邦機(jī)器為大家?guī)?..
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實(shí)拍 牛人自己制作靜態(tài)磁鐵發(fā)電機(jī)的過程
[視頻]時(shí)長(zhǎng)01:02[/####][####]實(shí)拍牛人自己制作靜態(tài)磁鐵發(fā)電機(jī)的過程[/####]haokan.baidu.com/v?pd=wi...-快照小伙用磁鐵制作的小裝置,試了下竟然能發(fā)電,太神奇了_網(wǎng)易視頻
小伙用磁鐵制作的小裝置,試了下竟然能發(fā)電,太神奇了亞健康的調(diào)理 4'10" ...形狀各異的小彈簧制作過程,這次機(jī)器調(diào)慢了讓你看個(gè)清楚 制造原理 5'1" 世界...
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磁鐵生產(chǎn)流程_
評(píng)分:5/53頁(yè)[/####]2012年1月12日-磁鐵生產(chǎn)流程_能源/化工_工程科技_專業(yè)資料。階段 部門 客戶 業(yè)務(wù) 工程 品管 生產(chǎn) 物控 采購(gòu) 產(chǎn)品評(píng)估 產(chǎn)品需求 市場(chǎng)調(diào)查 報(bào)價(jià) 成品預(yù)估 樣品制作審查...
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磁鐵的制造工藝流程是如何的_鐘少玲 - 我是行家回答
2016年9月19日-磁鐵的制造工藝流程是如何的 標(biāo)簽:冶金礦產(chǎn) 磁性材料 永磁材料 瀏覽數(shù):174 舉報(bào) 鐘少玲 2016.09.19 深圳市云錠錫業(yè)有限公司 配料→ 熔煉制錠→ 制粉...
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大開眼界了,磁鐵原來是這樣制造的,制模到成品過程如此漫長(zhǎng)_騰...
[視頻]時(shí)長(zhǎng)04:33[/####][####]2017年9月14日-體育老師 忘憂鎮(zhèn) 開封奇談 維和步兵營(yíng) 國(guó)民大生活 使徒行者2[國(guó)語版] 特勤精英 那年花開月正圓 傳奇大亨 美味奇緣 何所冬暖,何所夏涼 大不容易 ...[/####]v.qq.com/x/page/u0550wko...-快照制作電磁鐵需要什么材料?制作過程中需要注意什么?請(qǐng)..._
2013年5月10日-制作過程中需要注意什么?請(qǐng)畫出你制作的電磁鐵康欣雨 | 舉報(bào) 報(bào)告,這不是個(gè)...2 磁鐵可以做出來嗎?磁鐵可以制造出來嗎? 3 用自己制作的電磁鐵和一節(jié)電...
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【】R-Fe-B系薄膜磁鐵及其制造方法_
中村一也,坂口英二,町田憲一-CN-2010[####]本發(fā)明提供了一種R-Fe-B系薄膜磁鐵,在物理成膜的含有28-45質(zhì)量%的R元素(其中,R是鑭系稀土元素中的1種或2種以上)的R-Fe-B系合金中,具有晶粒直徑0.5-30μm的R2Fe14B晶體和...[/####] 如何制作電磁鐵_經(jīng)驗(yàn)
2017年6月23日-經(jīng)驗(yàn) > 手工/愛好 > 手工藝如何制作電磁鐵 ...這種通有電流的線圈像磁鐵一樣具有磁性,它也叫做...
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磁鐵看著挺簡(jiǎn)單的 沒想到制造過程這么復(fù)雜_騰訊視頻
[視頻]時(shí)長(zhǎng)04:46[/####][####]2017年2月9日-連續(xù)簽到搶VIP 三倍流暢播放 1080P藍(lán)光畫質(zhì) 新劇提前看 立即體驗(yàn) 1080P藍(lán)光畫質(zhì) 純凈式無框播放器 三倍流暢播放 立即體驗(yàn) Mac客戶端 ...[/####]v.qq.com/x/page/k0373f0h...-快照.wa-se-st-single-video-zhanzhang-play { position: absolute; height: 40px; width: 40px; top: 50%; left: 50%; margin: -20px 0 0 -20px; background: url(data:image/png;base64,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) no-repeat; 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牛人教你用磁鐵制作一臺(tái)發(fā)電機(jī),過程太精彩
[視頻]時(shí)長(zhǎng)10:30[/####][####]04-02 男子手把手教你,制作一個(gè)電磁鐵發(fā)電,能點(diǎn)亮燈泡你成功了 04-02 牛人教你用磁鐵制作一臺(tái)發(fā)電機(jī),過程太精彩 04-02 牛人教你自制盤式無鐵芯發(fā)電機(jī) ...[/####]my.tv.sohu.com/us/321304...-快照.wa-se-st-single-video-zhanzhang-play { position: absolute; height: 40px; width: 40px; top: 50%; left: 50%; margin: -20px 0 0 -20px; background: url(data:image/png;base64,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) no-repeat; 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[視頻]時(shí)長(zhǎng)04:45[/####][####]看看電動(dòng)機(jī)的制作過程!竟然需要這么一塊大磁鐵! 4353次播放01:18 榮耀 四條腿的關(guān)羽不要在魯班面前耍威風(fēng) 下場(chǎng)是很慘的 2507次播放 01:11 榮耀:...[/####]wapsite.baidu.com/video/...-快照鐵芯、磁鐵制造業(yè)解決方案 成型機(jī) 沖壓機(jī) 軟磁、硬磁 成型 燒結(jié) ...
鐵芯、磁鐵制造業(yè)相對(duì)而言是個(gè)流程簡(jiǎn)單的行業(yè),其行業(yè)...訂單批量大、機(jī)器產(chǎn)能主要決定訂單的交期、受模具...所面臨的主要問題是:如何在有限產(chǎn)能下,快速準(zhǔn)確的...
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磁鐵怎樣制造出來的呢?_
1個(gè)回答 - 提問時(shí)間: 2014年11月09日[/####]答案: 磁鐵有很多品種,方法不相同。要制造出合格磁鐵非常不容易。技術(shù)含量很高。簡(jiǎn)單說一種磁鐵的工藝流程:釹鐵硼 冶煉-制粉-成型-燒結(jié)-機(jī)加工-充磁更多關(guān)于磁鐵制造過程及所需機(jī)器的問題>>