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class="breadNav"> <div id="tvplbfh" class="abtext_tit" style="text-align:left;"><span>ARTICLE/</span> 技術(shù)文章</div> <div id="7pxbjvb" class="ny_pos"><a href="/">首頁(yè)</a> > <a href="/news.html">技術(shù)文章</a> > 檢測零件對洛氏硬度計的測量效果影響</div> </div> <div id="lnvnfbp" class="news_detail"> <h1>檢測零件對洛氏硬度計的測量效果影響</h1> <div id="v7jbtj7" class="nwdtl_tip"><span>更新時(shí)間：2024-05-22</span><span>瀏覽：253次</span></div> <div id="vj77bxx" class="nwdtl_con"> <strong>洛氏硬度計</strong>的主要特點(diǎn)：<div>生成多個(gè)洛氏，洛氏表面及布氏硬度試驗力等級。</div><div>海豚鼻式壓頭測臂設計，便于進(jìn)行內面和外面的接觸。</div><div>實(shí)時(shí)電子測力控制確保高精度負載，有效避免了試驗力超負載。</div><div>可通過(guò)壓頭退離功能在固定工作臺處進(jìn)行連續測量。有效減少了工作臺俯仰所帶來(lái)的不穩定因素。</div><div>自動(dòng)停止提升了工作臺并自動(dòng)預測能夠確保測力穩定生成的試驗力負載。</div><div>被測零件影響的因素：</div><div>1.斜面(或錐度)、球面及圓柱體零件對硬度測試的誤差較平面大。當壓頭壓入這種零件表面時(shí)，壓入處四周的抗力比平面小，甚至有偏離、滑移的現象，壓深增加，硬度降低。曲率半徑越小，斜度越大，硬度數值的減少越顯著(zhù)。金剛石壓頭也容易損壞。對這類(lèi)零件要設計工作臺，使工作臺和壓頭同心。</div><div>2.不同的表面光潔度在洛氏硬度測試時(shí)，表現出不同的影響。表面光潔度越低，高硬度測試時(shí)其硬度越高，反之硬度越低，有刀痕的粗糙表面，淬火時(shí)冷卻，或很堅硬的表層，硬度值就高。反之，調質(zhì)件高溫回火時(shí)，有刀痕的表層組織先轉變，抗回火的能力小，硬度值就低。在測試表面光潔度Δ7以下的零件時(shí)，使用廢砂輪磨，再用銼刀銼磨光滑，或用細的手砂輪磨光，然后揩擦干凈。</div><div>3.熱處理零件表面有鹽漬、沙子等物，當加負荷時(shí)，零件會(huì )產(chǎn)生滑移，若有油膩存在，金剛頭壓入時(shí)起潤滑作用，減小磨擦，增加壓深。這兩項原因使所測硬度值偏低。零件測試的部位氧化皮蔬松層薄的硬度值減少，氧化皮致密層厚的硬度值增加。對欲測硬度的零件去除氧化皮，揩擦干凈，不得有臟物。</div><div> </div> </div> </div> <div id="7vrvdrh" class="prev_next"> <ul> <li><p>上一篇：<a 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