Chipolopolo nkhungu kuponyerandi njira yomwe mchenga wosakanikirana ndi utomoni wa thermosetting umaloledwa kuti uzikumana ndi mbale yotentha yachitsulo, kotero kuti chigoba chowonda komanso cholimba chimapangidwa mozungulira pattem. Kenako chipolopolocho chimachotsedwa pamalingaliro ndikupirira ndi kukoka kumachotsedwa palimodzi ndikusungidwa mu botolo ndi zinthu zofunikira kumbuyo ndipo chitsulo chosungunuka chimatsanulidwira mu nkhungu.
Nthawi zambiri, mchenga wouma komanso wabwino (90 mpaka 140 GFN) womwe ulibe dongo umagwiritsidwa ntchito pokonzekera mchenga. Kukula kwa tirigu komwe kumasankhidwa kumatengera kumapeto kwa nthaka komwe mukufuna. Kukula bwino kwa tirigu kumafuna utomoni wambiri, zomwe zimapangitsa nkhunguyo kukhala yotsika mtengo.
Ma resin omwe amagwiritsidwa ntchito popanga zipolopolo kwenikweni ndi ma resin a thermosetting, omwe amaumitsidwa osasinthika ndi kutentha. Ma resin omwe amagwiritsidwa ntchito kwambiri ndi phenol formaldehyde resins. Pamodzi ndi mchenga, ali ndi mphamvu yayikulu komanso kukana kutentha. Ma resin a phenolic omwe amagwiritsidwa ntchito popanga zigoba nthawi zambiri amakhala amitundu iwiri, ndiye kuti utomoniwu umakhala ndi phenol wochulukirapo ndipo umakhala ngati chinthu chopangira ma thermoplastic. Pakuphimba ndi mchenga utomoni umaphatikizidwa ndi chothandizira monga hexa methylene tetramine (hexa) pamlingo wa 14 mpaka 16% kuti apange mawonekedwe a thermosetting. Kutentha kochiritsa kwa awa kungakhale mozungulira 150 C ndipo nthawi yomwe ikufunika idzakhala masekondi 50 mpaka 60.
Ubwino Njira Yopangira Nkhungu
1. Kuponyedwa kwa nkhono nthawi zambiri zimakhala zolondola kwambiri kuposa kuponyera mchenga. N'zotheka kupeza kulekerera kwa +0.25 mm pazitsulo zazitsulo ndi +0. 35 mm yazitsulo zoponyedwa ndi imvi munthawi zantchito. Pankhani ya zipolopolo zoyandikira kwambiri, munthu akhoza kuzipeza mu 0,03 mpaka +0.13 mm pazogwiritsa ntchito.
2. Malo osalala amatha kupezeka pazipolopolo. Izi zimatheka makamaka ngati tirigu wokulirapo yemwe amagwiritsidwa ntchito. Makulidwe amtundu wamtundu wamitundu 3 mpaka 6.
3. Makope oyeserera, omwe ndi ocheperako kuposa mchenga, amafunikira muzipolopolo. Kuchepetsa kwa ngodya zoyeserera kumatha kukhala kuyambira 50 mpaka 75%, zomwe zimapulumutsa ndalama zakuthupi ndi mtengo wotsatirapo.
4. Nthawi zina, mitima yapadera imatha kuthetsedwa pachikopa. Popeza mchengawo uli ndi mphamvu yayikulu nkhungu imatha kupangidwa mwanjira yoti mkati mwake mutha kupangika molunjika ndikufunika kwa zipolopolo.
5. Komanso, magawo ofooka kwambiri (mpaka 0.25 mm) amtundu wamitu yamiyala yopanda mpweya atha kupangidwa mosavuta ndi chipolopolo chifukwa cha kulimba kwa mchenga womwe amagwiritsidwa ntchito.
6. Kukhazikika kwa chipolopolocho ndikokwera kwambiri motero sipakhala mpweya wambiri.
7. Mchenga wochepa kwambiri uyenera kugwiritsidwa ntchito.
8. Makina ndi otheka mosavuta chifukwa cha kukonza kosavuta kophatikizidwa pakupanga zipolopolo.
Zolepheretsa za Shell Mold Kuponyera Njira
1. The pattens ndi okwera mtengo kwambiri choncho ndi ndalama pokhapokha ngati ntchito zikuluzikulu kupanga. Pogwiritsa ntchito, chipolopolo chimakhala chodalirika pamchenga ngati zotsatira zake zili pamwambapa kuposa zidutswa 15000 chifukwa cha mtengo wokwera.
2. Kukula kwa kuponyera komwe kumapangidwa ndi zipolopolo ndizochepa. Nthawi zambiri, zoponya zolemera makilogalamu 200 zitha kupangidwa, ngakhale zili zochepa, zoponyera zolemera makilogalamu 450 zimapangidwa.
3. Maonekedwe ovuta kwambiri sangapezeke.
4. Zida zotsogola kwambiri ndizofunika kuthana ndi zipolopolo monga zomwe zimafunikira pazitsulo zazitsulo.
Post nthawi: Dis-25-2020