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class="inside_rnewtime">點擊次數：726 發布時間：2018-11-08</div> <div class="inside_rnewcon"> 　　<strong><a href="http://www.renoscrapbooking.com/Products-17891443.html" target="_blank">硬度分析儀</a></strong>是評定金屬材料力學性能常用的儀器之一。硬度的實質是材料抵抗另一較硬材料壓入的能力。<div>　　</div><div>　　1、硬度分析儀本身會發生兩種偏差：一是其整機的變形、移動造成的偏差;二是硬度參數超出劃定標準所造成的偏差。對第二種偏差，在測量前需用標準塊對硬度計停止校準。對<strong>硬度分析儀</strong>校訂結果，差值在±1之內合格。差值在±2之內的穩固數值，能夠給出修改值。差值在±2規模之外時則必須對硬度計停止校訂維修或換其余硬度測試法測定。洛氏硬度各標度有一事實上的實用規模，要根據劃定選用。比方，硬度高于hrb100時，應采用hrc標度停止測試;硬度低于hrc20時運用hrb標度停止測試。由于超出其劃定的測試規模時，硬度分析儀的度及靈敏度較差，硬度值不，不宜使用。其余硬度測試法也都劃定有響應的校訂標準。校準硬度計用的標準塊不克不及兩面使用，因標準面與背面硬度不一定不合。正常劃定標準塊自標定日起一年內有效。</div><div>　　</div><div>　　2、在更換壓頭或砧座時，留心接觸部位要擦清潔。換好后，要用一定硬度的鋼樣測試幾次，直到持續兩次所得硬度值雷同為止。目的是使壓頭或砧座與試驗機接觸部分壓緊，接觸精良，以免影響試驗結果的準確性。</div><div>　　</div><div>　　3、在試件允許的情形下，正常選差別部位至少測試三個硬度值，取均勻值，取平均值作為試件的硬度值。</div><div>　　</div><div>　　4、加載前要檢查加載手柄能否放在卸載位，加載時方法要輕穩，不要使勁太猛。加載結束加載手柄應放在卸載位置，以免儀器暫時處于負荷狀態，發生塑性變形，影響測量度。</div><div>　　</div><div>　　5、<strong>硬度分析儀</strong>調劑后，開端測量硬度時，個測試點不用。因怕試樣與砧座接觸不好，測得的值不。特點測試完，硬度計處于畸形運轉機制狀態后再對試樣停止正式測試，記錄測得的硬度值。</div><div>　　</div><div>　　6、對形狀復雜的試件要采用響應形狀的墊塊，固定后方可測試。對圓試件正常要放在v形槽中測試。</div> </div> <div class="inside_newsthree"> <p 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