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感應(yīng)加熱的優(yōu)點與類型

發(fā)布時間：2022-02-17

與一般電爐相比較，感應(yīng)加熱具有加熱速度快、工件變形小、表面硬度高等優(yōu)點。

感應(yīng)加熱的原理是當(dāng)光流電通過感應(yīng)器時，由于電磁感應(yīng)，則在感應(yīng)器中的工件里產(chǎn)生交變磁場，交變磁場產(chǎn)生感應(yīng)電勢，該電勢在工件中形成電流，即渦流。渦流的密度在工件中分布不均勻，越靠近工件表層電流越大，并且頻率越高表面電流越大，所以感應(yīng)加熱工件時，功率集中消耗在工件的表層，因此工件表層溫度升高的快。隨著工件表層溫度的增高，工件的電阻率隨之增加，當(dāng)溫度達到居里溫度（768^。C）時，電功率又集中在靠里的一層……

所以感應(yīng)加熱也就是一個逐層加熱的過程，而正確的選用加熱功率、工作頻率與加熱時間就能達到所需的淬火溫度。

根據(jù)淬火深度的不同，可分成三種類型：

1.高頻加熱設(shè)備：

它有一套將工頻50周/秒交流電轉(zhuǎn)變?yōu)楦哳l（70000~1000000周/秒）電能的裝置（通常采用電子管高頻發(fā)生器），淬滅深度在3毫米以下。

2.中頻加熱設(shè)備：

它也有一套將工頻50周/秒轉(zhuǎn)變成中頻（500~10000周/秒）電能的裝置，通常為中頻發(fā)電機（功率因數(shù)低）和可控硅變頻器，淬火深度在5毫米左右。

3.工頻感應(yīng)加熱設(shè)備：

感應(yīng)器的電源頻率與電網(wǎng)的頻率相同，即50周/秒，所以可以直接從電網(wǎng)吸取能量，淬火深度在10毫米以上。不足的是功率因數(shù)過低。

上一篇：國華大廈火災(zāi)救火民警王健傷重犧牲捐獻眼角膜繼續(xù)幫人

下一篇：防雷的基本措施有哪些？

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