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發布時間：2018-11-15</div> <div class="inside_rnewcon"> 　　<strong><a href="http://www.renoscrapbooking.com/Products-17891443.html" target="_blank">硬度分析儀</a></strong>工作期間的常規檢查對保證試驗結果準確性很重要。硬度分析儀在使用中，由于一些運動部件的工作，會使硬度分析儀的性能發生變化，例如加力系統刀刃的磨損和刀承墊的松動或位移、加力杠桿的變形所引起杠桿比的變化所導致的試驗力不準，還有象控制力杠桿下沉位置定位塊的位置變動等，對于壓痕測量儀器，如鏡片或鏡頭松動等均會影響試驗結果準確性。因此對<strong>硬度分析儀</strong>作日常檢查十分必要。為了方便起見，建議采用標準塊對硬度分析儀作日常檢查。對于使用中的硬度測試儀，無損檢測資源網一般每天檢查一次。<div>　　</div><div>　　在檢查中，首先進行予壓，予壓時作的兩個壓痕主要起到使壓頭處于穩定狀態，不做為正式檢查依據。然后在標準塊上壓出壓痕，所使用的標準塊的硬度值應和試驗的材料硬度一致或接近，用測量和計算的布氏硬度數值與標準塊的標準硬度值比較，它們之間的差應小于GB/T231.2中對硬度分析儀示值誤差的要求。如果出現示值誤差大于標準規定，則應對硬度分析儀作直接檢驗，檢查試驗力，壓頭及壓痕測量裝置，找出原因。</div><div>　　</div><div>　　<strong>硬度分析儀</strong>的工作原理：用規定質量的沖擊體在彈力作用下以一定速度沖擊試樣表面，無損檢測資源網用沖頭在距試樣表面1mm處的回彈速度與沖擊速度的比值計算硬度值。</div><div>　　</div><div>　　沖擊和反彈速度的測得，是將一磁鐵組裝于沖擊體上，當沖擊體通過線圈時，它向前和彈回時均在線圈內感應出有微小差別的電壓。這些電壓正比于速度，經計算機處理在顯示裝置上顯示出硬度值HL。</div><div>　　</div><div>　　沖擊速度是一定的，這來源于卡鉤釋放后沖擊彈簧給予的力；而反彈速度決定于材料的硬軟。硬的材料受沖擊體沖擊后，塑性變形小，消耗的沖擊功小，反彈的速度就快。反之，消耗于塑性變形中的能量大，反彈的速度就慢。</div><div>　　</div> 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