高頻加熱機(jī)高效且節(jié)能

2019-07-09 9:13:34

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高頻加熱機(jī)是目前對金屬材料加熱效率較高、速度快，低耗節(jié)能環(huán)保型的感應(yīng)加熱設(shè)備。

高頻加熱機(jī)的特點是溫度集中在表層，這就是為什么具有高效，節(jié)能和小變形的優(yōu)點。然而，由于從硬化層到芯的溫度急劇變化，在過渡區(qū)中經(jīng)常引起大的殘余拉應(yīng)力。

從高頻加熱機(jī)淬火冷軋輥殘余應(yīng)力的分布可以清楚地看到這一現(xiàn)象，對于經(jīng)回火預(yù)熱處理的工件，在感應(yīng)加熱過程中，其中一個過渡區(qū)的回火溫度高于回火溫度，但低于A，過渡回火區(qū)最終將變?yōu)槿鯀^(qū)。

因此，對于感應(yīng)加熱設(shè)備的淬火齒輪，如果硬化層較淺，在硬剪應(yīng)力和外部載荷形成的高殘余拉伸應(yīng)力的共同作用下，弱過渡區(qū)很可能會產(chǎn)生疲勞裂紋，會導(dǎo)致硬化層剝落。

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