Kev faib ua pwm

Mould forming hais txog kev tsim cov khoom thiab cov khoom los ntawm kev tsim thiab siv pwm. Moulding tuaj yeem muab faib ua ntau hom, compression molding, txhaj tshuaj molding, extrusion molding, txhaj tshuaj molding, hollow molding, tuag-cam khwb cia molding, thiab lwm yam.

(1) Compression molding

Feem ntau hu ua xovxwm molding, nws yog ib qho ntawm cov txheej txheem ntxov tshaj plaws ntawm kev tsim cov khoom yas. Compression molding yog ntxiv cov yas ncaj qha rau hauv qhov qhib pwm kab noj hniav nrog qhov kub thiab txias, thiab tom qab ntawd kaw cov pwm. Nyob rau hauv qhov kev txiav txim ntawm tshav kub thiab siab, cov yas melts thiab dhau los ua lub xeev ntws. Vim muaj kev cuam tshuam rau lub cev thiab tshuaj lom neeg, cov yas hardens rau hauv ib feem yas uas muaj qee yam zoo thiab qhov loj me uas tseem tsis hloov pauv ntawm chav tsev kub. Compression molding yog tsuas yog siv rau molding thermosetting plastics, xws li phenolic molding hmoov, urea-formaldehyde thiab melamine formaldehyde molding hmoov, iav fiber reinforced phenolic plastics, epoxy resin, DAP resin, silicone resin, polyimide, thiab lwm yam. unsaturated polyester mass (DMC), sheet molding compound (SMC), prefabricated monolithic molding compound (BMC), thiab lwm yam mus rau qhov sib piv cov qauv ntawm sab sauv thiab sab pwm ntawm compression zaj duab xis.

(2) Txhaj tshuaj molding

Cov yas yog thawj zaug ntxiv rau lub rhaub cua sov ntawm lub tshuab txhaj tshuaj. Cov yas yog rhuab thiab yaj. Tsav los ntawm cov ntsia hlau lossis plunger ntawm lub tshuab txhaj tshuaj, nws nkag mus rau hauv pwm kab noj hniav los ntawm lub nozzle thiab pwm pouring system. Nws yog hardened thiab zoo li tus vim lub cev thiab tshuaj los ua txhaj tshuaj molding. cov khoom. Kev txhaj tshuaj molding muaj ib lub voj voog uas muaj kev txhaj tshuaj, lub zog tuav (txias) thiab cov txheej txheem yas demoulding, yog li kev txhaj tshuaj molding muaj cov yam ntxwv zoo. Thermoplastic txhaj tshuaj molding muaj lub voj voog luv luv, kev ua haujlwm siab, thiab hnav me me ntawm cov pwm los ntawm cov yaj. Nws tuaj yeem pwm ntau qhov ntawm cov khoom yas nrog cov duab nyuaj, cov qauv ntawm qhov chaw thiab cov cim, thiab qhov tseeb qhov siab; Txawm li cas los xij, rau cov yas uas muaj kev hloov loj ntawm phab ntsa thickness, qhov chaw, nws yog ib qho nyuaj kom tsis txhob molding tsis xws luag. Anisotropy ntawm cov khoom yas kuj yog ib qho teeb meem zoo, thiab txhua qhov kev ntsuas yuav tsum tau ua kom txo qis.

(3) Extrusion molding

Nws yog ib txoj kev molding uas tso cai rau cov yas nyob rau hauv lub viscous flow xeev kom dhau los ntawm ib tug tuag nrog ib tug tshwj xeeb cross-sectional duab nyob rau hauv high kub thiab ib tug tej yam siab, thiab ces ua nws mus rau hauv ib tug nruam profile nrog rau qhov yuav tsum tau cross-sectional duab ntawm ib tug. qis kub. Cov txheej txheem ntawm extrusion molding suav nrog kev npaj cov ntaub ntawv molding, extrusion shaping, txias thiab shaping, rub thiab txiav, thiab tom qab ua cov khoom extruded (tempering lossis cua sov kho). Thaum lub sij hawm extrusion molding txheej txheem, xyuam xim rau kho qhov kub ntawm txhua qhov cua sov ntawm lub extruder chim thiab tuag tuag, ntsia hlau rotation ceev, traction ceev thiab lwm yam txheej txheem tsis nyob rau hauv thiaj li yuav tau txais kev tsim nyog extrusion profiles. Tshwj xeeb yuav tsum tau them nyiaj rau kev kho tus nqi ntawm cov polymer yaj yog extruded los ntawm cov tuag. Vim hais tias thaum lub extrusion tus nqi ntawm cov khoom molten yog tsawg, lub extrudate muaj ib tug du nto thiab uniform cross-sectional zoo; tab sis thaum extrusion tus nqi ntawm cov khoom molten ncav cuag ib qho kev txwv, qhov saum npoo ntawm extrudate yuav ntxhib thiab poob nws cov luster. , shark tawv nqaij, txiv kab ntxwv tev kab, cov duab distortion thiab lwm yam tshwm sim tshwm sim. Thaum tus nqi extrusion yog ntxiv lawm, lub extrudate nto yuav distorted thiab txawm detaches thiab lov rau hauv melt fragments los yog thooj voos kheej kheej. Yog li ntawd, kev tswj tus nqi extrusion yog qhov tseem ceeb heev.

(4) Kev txhaj tshuaj molding

Txoj kev molding no tseem hu ua hloov molding. Nws yog txhawm rau ntxiv cov khoom siv yas rau hauv lub tsev noj mov preheated, tom qab ntawd muab lub siab rau hauv chav noj mov kom kaw cov pwm, thiab siv lub zog rau cov yas los ntawm cov kab siab. Cov yas yaj mus rau hauv lub xeev ntws nyob rau hauv qhov kub thiab txias, thiab nkag mus rau hauv pwm kab noj hniav los ntawm cov txheej txheem pouring. Maj mam solidifies rau hauv cov khoom yas. Kev txhaj tshuaj molding yog tsim rau cov yas uas qis dua cov khoom. Cov yas uas tuaj yeem ua rau compression molded hauv txoj cai tseem tuaj yeem ua los ntawm kev txhaj tshuaj molding. Txawm li cas los xij, cov khoom siv molding yuav tsum muaj qhov zoo fluidity nyob rau hauv lub molten lub xeev thaum nws yog qis dua lub solidification kub, thiab muaj ib tug loj solidification tus nqi thaum nws siab tshaj lub solidification kub.

(5) Hollow molding

Nws yog los kho cov tubular los yog daim ntawv dawb paug ua los ntawm extrusion los yog txhaj tshuaj thiab tseem nyob rau hauv lub xeev plasticized nyob rau hauv lub molding pwm, thiab tam sim ntawd qhia lub compressed cua kom yuam kom cov dawb paug nthuav thiab lo rau ntawm phab ntsa ntawm cov pwm kab noj hniav. Ib txoj kev ua nyob rau hauv uas cov khoom hollow xav tau los ntawm demoulding tom qab txias thiab shaping. Plastics haum rau hollow molding yog high-pressure polyethylene, low-pressure polyethylene, nyuaj polyvinyl chloride, mos polyvinyl chloride, polystyrene, polypropylene, polycarbonate, thiab lwm yam. tshuab moulding thiab txhaj tshuaj molding. Qhov zoo ntawm extrusion tshuab moulding yog tias cov qauv ntawm extruder thiab extrusion tshuab pwm yog qhov yooj yim. Qhov tsis zoo yog tias phab ntsa thickness ntawm parison tsis sib haum, uas tuaj yeem yooj yim ua rau phab ntsa tuab ntawm cov khoom yas. Qhov kom zoo dua ntawm kev txhaj tshuaj molding yog tias phab ntsa thickness ntawm lub parison yog uniform thiab tsis muaj flash npoo. Txij li thaum txhaj tshuaj parison muaj lub hauv qab nto, yuav tsis muaj seams thiab seams nyob rau hauv qab ntawm cov khoom hollow, uas tsis yog tsuas yog zoo nkauj tab sis kuj muaj zog. Qhov tsis zoo yog tias cov khoom siv molding thiab cov pwm siv yog kim, yog li no txoj kev molding feem ntau yog siv rau kev tsim khoom loj ntawm cov khoom me me hollow, thiab tsis yog siv dav raws li extrusion tshuab molding txoj kev.

(6) Tuag casting pwm

Tuag casting yog lub ntsiab lus ntawm lub siab casting. Cov txheej txheem tuag-casting yog ntxiv cov khoom siv yas rau hauv cov khoom noj khoom haus preheated, thiab tom qab ntawd siv lub siab rau hauv siab. Cov yas yaj nyob rau hauv qhov kub thiab txias siab, nkag mus rau hauv kab noj hniav los ntawm pwm lub tshuab pouring, thiab maj mam hardens rau hauv cov duab. Txoj kev molding no hu ua die-casting. Cov pwm siv yog hu ua pwm tuag-casting. Hom pwm no feem ntau yog siv rau molding ntawm thermosetting yas.

Pwm molding yog ib qho ntawm cov txheej txheem tseem ceeb rau kev tsim cov khoom tsim los ntawm ntau yam ntaub ntawv xws li yas thiab hlau. Tsis tas li ntawd, muaj ua npuas ncauj yas molding pwm, iav fiber reinforced yas low-pressure molding pwm, thiab lwm yam.

Moulding tuaj yeem paub qhov txawv raws li cov khoom siv sib txawv, cov qauv sib txawv deformation, cov tshuab molding sib txawv, molding raug, thiab lwm yam. Kev nkag siab txog cov txheej txheem sib txawv yuav pab koj ua qhov kev xaiv zoo tshaj plaws hauv kev xaiv cov txheej txheem tsim khoom thiab zam kev tsis tsim nyog los ntawm kev xaiv tsis raug.