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</span> <span> 2022-07-22 08:35 </span> </div> <div id="ozjua8vr6yq6" class="p14-infocontent-1-desc endit-content"><p> <div> PP管材塑性加工變形及氣割安全操作</div> <div> </div> <div> PP管材在塑性加工時(shí)曲折尤為顯著，如曲折變形區(qū)外側(cè)壁及脹形變形區(qū)管壁，擴(kuò)口及翻邊變形區(qū)的管壁，均會發(fā)生壁厚變薄。變薄量***的部位在變形處，變薄過度時(shí)導(dǎo)致破裂。PP管材從東西放置架上取出，已到達(dá)要求溫度的加熱板放在操作架上，一邊靠在焊接面的一面，推進(jìn)液壓夾具，使壓力到達(dá)要求的熔接壓力。當(dāng)焊接面熱熔翻邊到達(dá)1mm時(shí)，松開加熱卸壓閥，卸去加熱壓力，等待到一段時(shí)間后，就到達(dá)了焊接面熱熔對接的要求。</div> <div> </div> <div> 在PP管材的曲折加工中，若不采取必要的辦法，曲折后的橫斷面或***或小地都將發(fā)生畸變。咱們利用模具對管材切斷時(shí)，由于切刀對管壁的壓力效果，也會使切斷面發(fā)生壓塌現(xiàn)象，變?yōu)榉菆A形。咱們需選用合理的工藝方法及采取必要的工藝辦法。咱們用于塑性加工的管材，按材質(zhì)的不同可分為鋼管和有色金屬管兩類，有色金屬管包括銅和銅合金管、鋁和鋁合金管、鎳和鎳合金管等。在日常出產(chǎn)中除常用鋼、銅、鋁管外，也較廣泛地運(yùn)用各種合金和其它金屬管。</div> <div> </div> <div> PP管材</div> <div> </div> <div> 咱們依據(jù)管材的斷面形狀，可分為圓形管和異形管。圓形管的標(biāo)準(zhǔn)一般用外徑X壁厚標(biāo)明。異形管有橢圓形、三角形、梯形、矩形、正方、六方等各種復(fù)雜形狀，其標(biāo)準(zhǔn)標(biāo)明方法也各不相同。依據(jù)管材出產(chǎn)方法，可分為熱軋管、冷軋管、冷拔管、揉捏管等。依據(jù)壁厚不同可分為厚壁管、薄壁管(壁厚小于2rnm)以及外徑不***于5mm的毛細(xì)管。在曲折變形區(qū)內(nèi)側(cè)壁及縮口(徑)變形區(qū)管壁，壁厚均有添加。若變形程度過***，則管壁損失穩(wěn)定，引起皺折。在壓應(yīng)力效果下，相同存在塑性失穩(wěn)問題。</div> <div> </div> <div> PP管材氣割安全操作，氣割場所周圍應(yīng)清除易燃、易爆物品，乙炔瓶(或乙炔發(fā)生器)、氧氣瓶與氣割場所應(yīng)保持一定距離；氧氣瓶、氧氣表及割炬等嚴(yán)禁曝曬、感染油脂或劇烈振動，安裝氧氣表時(shí)應(yīng)站在瓶口旁邊面，避免事端傷人；乙炔瓶(或乙炔發(fā)生器)附近嚴(yán)禁煙火,且不得放置在電線的正下方；在點(diǎn)燃時(shí)，槍日不準(zhǔn)對人，避免燙傷；PP管割炬須經(jīng)檢查后才能運(yùn)用、檢查方法是先拔掉乙炔管，翻開乙炔閥甲開啟氧氣調(diào)節(jié)閥，將手指肚緊貼在乙炔入口上，如有吸力標(biāo)明割炬射吸情況正常，無吸力標(biāo)明射吸情況不***，則不能運(yùn)用。</div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> 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