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熱處理的節能
來源: | 作者:hkw935742 | 發布時間: 2018-09-06 | 1158 次瀏覽 | 分享到:
       在傳統工藝計算時間:T=K*A*D式中的T為加熱時間,K為裝爐系數,A為加熱系數,D為工件有效厚度。其實我們在實際生產中,一般是根據以往工作經驗和工件有效厚度來計算保溫時間,大批量時就根據實際經驗或是觀測工件的火色,這主要反應在碳素鋼和低合金鋼上,這是由于碳素鋼沒有合金元素和碳化物,不須長時間保溫均勻奧氏體化過程。低合金鋼因其傳熱系數與碳素鋼基本類似,所以工件透熱時間主要是由其有效尺寸決定的,對于生產中單件的工件,當爐溫已達到工藝設定值時,也就是說工件表面已達到工藝溫度值時,工件已透燒了,不要再額外增加保溫時間了,這就是我們常說的“零”保溫加熱。對于大批量生產時,我們一般會先加熱爐子,到溫后再放入工件,等爐溫再次達到工藝時間時,再加一定的均勻化時間,這樣可以相對的縮短工藝周期,節約能源和降低成本。
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