螺杆加工螺杆打滑不下料的原因分析

螺杆加工螺杆打滑不下料的原因分析 1
、工藝參數的影響 機ji筒tong後hou段duan溫wen度du低di通tong常chang是shi造zao成cheng注zhu塑su機ji螺luo杆gan打da滑hua的de主zhu要yao原yuan因yin。注zhu塑su機ji機ji筒tong分fen為wei三san段duan
，在zai加jia料liao段duan後hou部bu，物wu料liao在zai加jia熱re壓ya縮suo過guo程cheng中zhong形xing成cheng一yi層ceng熔rong融rong聚ju合he物wu薄bo層ceng。熔rong融rong膜mo層ceng貼tie在zai機ji筒tong上shang。如ru果guo沒mei有you這zhe一yi薄bo層ceng，粒li料liao就jiu很hen難nan向xiang前qian輸shu送song。 處(chu)於(yu)加(jia)料(liao)段(duan)內(nei)的(de)物(wu)料(liao)必(bi)須(xu)加(jia)熱(re)到(dao)臨(lin)界(jie)溫(wen)度(du)，才(cai)能(neng)產(chan)生(sheng)關(guan)鍵(jian)的(de)熔(rong)融(rong)膜(mo)層(ceng)。然(ran)而(er)常(chang)常(chang)是(shi)物(wu)料(liao)在(zai)機(ji)筒(tong)中(zhong)滯(zhi)留(liu)時(shi)間(jian)太(tai)短(duan)不(bu)能(neng)使(shi)聚(ju)合(he)物(wu)達(da)到(dao)該(gai)溫(wen)度(du)。這(zhe)種(zhong)情(qing)況(kuang)的(de)發(fa)生(sheng)可(ke)能(neng)是(shi)由(you)於(yu)設(she)備(bei)規(gui)模(mo)太(tai)小(xiao)
，相(xiang)應(ying)配(pei)置(zhi)較(jiao)小(xiao)的(de)機(ji)筒(tong)和(he)螺(luo)杆(gan)所(suo)造(zao)成(cheng)的(de)。停(ting)留(liu)時(shi)間(jian)過(guo)短(duan)易(yi)造(zao)成(cheng)聚(ju)合(he)物(wu)熔(rong)融(rong)或(huo)混(hun)合(he)不(bu)充(chong)分(fen)，從(cong)而(er)會(hui)導(dao)致(zhi)螺(luo)杆(gan)打(da)滑(hua)或(huo)停(ting)轉(zhuan)。 xianzaijieshaochuxiangaiwentidelianggejiandanchulifangfa。congjitongmoduankaishijiarenshaoliangwuliaojinxingqingxi，bingqiejianzharongrongwendu。ruguotingliushijianduan，namerongrongwenduhuidiyujitongwendudeshedingzhi。dierzhongfangfashiguanchachengxingzhipin，ruguofaxianyourudalishibanwen、黑點或淡條紋
，那就表明物料在機筒內沒有得到很好的混煉。 出chu現xian螺luo杆gan打da滑hua嚐chang試shi的de解jie決jue方fang法fa之zhi一yi是shi，逐zhu漸jian提ti升sheng加jia料liao段duan的de溫wen度du，直zhi到dao螺luo杆gan旋xuan轉zhuan和he後hou退tui達da到dao協xie調tiao一yi致zhi。有you時shi不bu得de不bu將jiang機ji筒tong溫wen度du提ti高gao到dao推tui薦jian設she定ding值zhi以yi上shang才cai能neng達da到dao這zhe一yi範fan圍wei。 shezhiguogaodebeiyayehuidaozhiluogantingzhuanhuodahua。tigaobeiyashedingzhiyejiutigaolejinrudaowuliaozhongdenengliang。ruguobeiyashedingguogao，nameluoganyexubunengchanshengzugoudexiangqianshusongrongtiyali
，yikefubeiyadefanya，luoganjiuhuizaimougeweizhixuanzhuanbuhuihoutui
，zheyanghuiduirongtizuogengduodegongbingxianzhutigaorongtiwendu
，congerduizhipinzhilianghexunhuanzhouqichanshengbuliyingxiang。shijiazairongtishangdebeiyakeyitongguozhushejitongshangdekongzhifajinxingtiaojie。 2、設備的影響 ruguozhusujiluogandahuayuanyinshiyouyujiagongshebeierbushigongyicanshuyinqide
，nameluoganhejitongmosunjiuhenyoukenengshiwentiguanjian。yujialiaoduanyiyang

，dangshuzhizailuoganyasuoduanronghuashizhanfuzaijitongbishang。dangluoganjinxingxuanzhuanshi，wuliaoshoudaojianqielihoulikaijitongbibingxiangqianfangshusong。ruguoluoganhejitongshangyoumosunqu，nameluoganjiubunengyouxiaoxiangqianshusongwuliao。ruguohuaiyishebeicunzaiyoumosun，jiuyinggaijianzhaluoganhejitong，bingjianyanliangzhezhijiandepeihejianxi。ruguoluoganhejitongdepeihejianxichaoguobiaozhunzhi，yinggaizheshougenghuanhuozheweixiugongzuo。 注塑機螺杆設計參數特別是壓縮比(加料段深度比均化段深度)對塑化均勻性起到至關重要的作用。加料段太淺(得到較小的壓縮比)會降低產量並會因喂料不足而造成螺杆打滑。各種樹脂的供應商一般都有推薦注塑物料的最佳壓縮比。 3

、止逆環(單向閥)發生故障也會導致螺杆打滑。當螺杆在旋轉並進行塑化 物料時,止逆環應該處於前麵(打開)位置，接觸固定環座。如果止逆環是處於向後(閉合)狀態，或介於向前和向後之間的狀態
，熔融聚合物在通過止逆環和環座之間的缺口時會有阻力。如果懷疑止逆環有問題應立即替換。 樹shu脂zhi進jin料liao鬥dou也ye會hui是shi造zao成cheng多duo種zhong注zhu塑su螺luo杆gan打da滑hua的de原yuan因yin所suo在zai。正zheng確que的de料liao鬥dou設she計ji是shi保bao證zheng能neng穩wen定ding輸shu送song物wu料liao的de關guan鍵jian，但dan這zhe點dian經jing常chang被bei忽hu略lve。通tong常chang來lai說shuo，大da小xiao均jun勻yun的de新xin粒li料liao在zai含han有you突tu變bian壓ya縮suo區qu的de方fang型xing料liao鬥dou(底部突然變窄)中zhong運yun行xing良liang好hao。然ran而er，加jia入ru再zai生sheng物wu料liao時shi就jiu不bu是shi這zhe種zhong情qing況kuang。經jing過guo再zai次ci粉fen碎sui粒li料liao的de形xing狀zhuang和he大da小xiao很hen不bu一yi致zhi，這zhe會hui影ying響xiang到dao進jin料liao的de均jun勻yun性xing。進jin料liao不bu連lian貫guan意yi味wei著zhe注zhu塑su機ji螺luo杆gan杆gan不bu能neng保bao持chi熔rong體ti上shang均jun勻yun的de輸shu送song壓ya力li，進jin而er產chan生sheng打da滑hua。要yao解jie決jue這zhe一yi問wen題ti，解jie決jue再zai生sheng料liao與yu新xin粒li料liao尺chi寸cun大da小xiao的de差cha異yi問wen題ti，可ke嚐chang試shi使shi用yong涉she及ji有you平ping緩huan壓ya縮suo區qu(底部呈平緩梯度狀)的圓形料鬥。 4、材料均勻性 正如上述所說
，物料顆粒形狀和尺寸大小會影響進料的連貫性。粒料形狀不佳會引起螺杆加工性能下降、產(chan)量(liang)波(bo)動(dong)以(yi)及(ji)注(zhu)塑(su)機(ji)螺(luo)杆(gan)打(da)滑(hua)。形(xing)狀(zhuang)均(jun)勻(yun)的(de)粒(li)料(liao)在(zai)螺(luo)杆(gan)加(jia)料(liao)段(duan)能(neng)更(geng)緊(jin)密(mi)的(de)堆(dui)積(ji)在(zai)一(yi)起(qi)。在(zai)螺(luo)杆(gan)中(zhong)的(de)粒(li)料(liao)越(yue)是(shi)被(bei)緊(jin)密(mi)的(de)堆(dui)積(ji)在(zai)一(yi)起(qi)，物(wu)料(liao)就(jiu)有(you)更(geng)多(duo)的(de)時(shi)間(jian)在(zai)螺(luo)杆(gan)中(zhong)熔(rong)融(rong)並(bing)向(xiang)前(qian)輸(shu)送(song)。形(xing)狀(zhuang)不(bu)佳(jia)的(de)粒(li)料(liao)會(hui)有(you)更(geng)大(da)的(de)自(zi)由(you)體(ti)積(ji)(粒料之間較低的容積密度或更多的真空區)，並且進料困難，造成螺杆出現打滑。提高機筒後段溫度
，可使物料更快開始熔融

，熔體流獲得的壓縮性更大。 zaijiagongnilongdengxishixingcailiaoshi
，chaoshiyehuidaozhiluogandahua。buzhengquedewuliaoganzaohuimingxianjiangdijitongzhongcailiaozhandubingchanshengshuizhengqi，shizhusujiluogannanyixiangqianshusongwuliao。yinggaizaiganzaoliaodoudedibushiyongshidujiceliangliliaodeshiduzhi，bingyucailiaogongyingshangtuijiandeshiduhanliangjinxingdushuduibi。