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clearfix"><p class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/first-_wjgj/">五金、工具</a>?<a href="http://www.cdcfah.com/cp/second-wjgj_guanjianbi/">管件</a>?<a href="http://www.cdcfah.com/cp/third-guanjianbi_falanvt/">法蘭</a>?黑龍江鋼管規(guī)格歡迎咨詢河北長洪管業(yè)供應(yīng)</p><div id="l9rpdtx" class="leftbox clearfix"><h1>黑龍江鋼管規(guī)格歡迎咨詢河北長洪管業(yè)供應(yīng)</h1><div id="dvl9vrb" class="proBig"><div id="jzrzhjl" class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/10/16/11/637068211393063880_jiazong01_1796304.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="nvj3b3d" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/10/16/11/637068211393063880_jiazong01_1796304.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="lvvn5dh" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>河北省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>黑龍江鋼管規(guī)格</p><p><span>***更新：</span>2020-05-29 05:04:56</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="hbhp9b3" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">河北長洪管業(yè)有限公司</a></p><p><span>聯(lián)系人：</span>賈世豪</p><p><span>郵箱: </span>2047452166@qq.com</p><p><span>電話: </span>17363075791</p><p><span>傳真: </span>0317_5538516</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>0317-5538516</p><p><span>地址: </span>河北省滄州市孟村回族自治縣孟村鎮(zhèn)二街</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="fhpntbj" class="page-proshow02"><p class="title">詳細說明</p><div id="hh7dnbr" class="box"><p><p> 烯經(jīng)聚合制得的一種熱塑性樹脂。 </p> <p> (1)隨聚乙烯分子質(zhì)量的減小，黑龍江鋼管規(guī)格,MFR增加,熔體易流動，黑龍江鋼管規(guī)格,熔體壓力低,擠出溫度也較低,有利于抗老化性;熔體延伸性增加,有利于高速作業(yè),也不易造成分層。但熔體強度下降,焊道厚度不易保持,耐環(huán)境應(yīng)力開裂性能下降。 </p> <p> (2)隨聚乙烯分子質(zhì)量分布的增加(變寬)，黑龍江鋼管規(guī)格,易于加工(低分子質(zhì)量部分起內(nèi)潤滑作用),熔體強度增加,有利于保持焊道厚度,對降低分層和縱橫向性能偏差也有益;但熔體延伸性下降,不利于高速作業(yè)。耐環(huán)境應(yīng)力開裂性能下降。 </p> <p> (3)提高擠出溫度,熔體壓力下降,熔體延伸性增加,防腐層不易分層;但會消耗更多的抗氧劑而不利于老化性能;焊道厚度也不易保持。提高溫度降低了出口膨脹,因而取向程度減小,對降低縱橫向性能偏差有。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="黑龍江鋼管規(guī)格" src="http://tyunfile.71360.com/UpLoadFile/2019/10/16/11/637068211393063880_jiazong01_1796304.jpg"></div><p> 近年來，隨著車輛輕量化發(fā)展要求，局部加厚管這類零件需求量也增大，因此管坯鐓壓成形工藝得到發(fā)展。管坯局部鐓粗的零件有以下幾種形式：①管子內(nèi)徑保持不變、外徑加大而加粗管坯；②管子外徑保持不變而內(nèi)徑縮??；③同時加大外徑縮小內(nèi)徑。不管是哪種形式，管坯鐓粗時的主要問題是防止管壁因縱向彎曲所引起的折紋。通過長期生產(chǎn)實踐經(jīng)驗，人們總結(jié)出管坯局部鐓粗時應(yīng)遵循的工藝原則，即所謂的管坯局部鐓粗規(guī)則。 </p> <p> 概括起來，主要有兩條：1)當(dāng)管坯變形部分長度小于管坯壁厚的3倍時，允許一次鐓粗到任意外徑而不產(chǎn)生彎曲。2)當(dāng)管坯變形部分長度大于管坯壁厚的3倍時（一般是這種鐓粗），必須在模具中鐓粗，且一次局部鐓粗所能達到的比較大厚度不能超過原始管坯厚度的1.5倍，否則將產(chǎn)生失穩(wěn)變形。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="黑龍江鋼管規(guī)格" src="http://tyunfile.71360.com/UpLoadFile/2019/10/16/11/637068211413845928_jiazong01_8373115.jpg"></div><p> (2)變形長度大于壁厚3倍的管坯，不能一次鐓粗到任意尺寸管坯局部鐓粗，在機器的一次行程中鐓粗到任意尺寸時，其變形長度不能超過管坯壁厚的3倍，否則管坯容易失穩(wěn)而產(chǎn)生縱向彎曲，導(dǎo)致折疊。 </p> <p> (3)端面不平的管坯，不能鐓粗成形在生產(chǎn)條件下，管料可以通過高速帶鋸鋸切或利用模具剪切，管坯端面可能既不平整，也不與軸線垂直，這時施加軸壓壓力必然導(dǎo)致軸壓失穩(wěn)，因此端面不平的管坯，不能進行鐓粗成形。 </p> <p> (4)法蘭高度小于管坯壁厚的1/2時，一次鐓粗的法蘭外徑不能超過管坯外徑的2.5倍當(dāng)法蘭高度小于管坯厚度的1/2時，一次鐓粗的法蘭外徑不能超過管坯外徑的2.5倍，否則將引起管坯失穩(wěn)而導(dǎo)致外壁折疊。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="黑龍江鋼管規(guī)格" src="http://tyunfile.71360.com/UpLoadFile/2019/10/16/11/637068211393063880_jiazong01_3785110.jpg"></div></p><br /><p>文章來源地址: 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