Sprickor är en vanlig defekt hos plastprodukter, ② Temperaturkontrollfel orsakat av temperaturregulator eller värmesystemfel. ② Temperaturkontrollfel orsakat av temperaturregulator eller värmesystemfel, yttre spänning och spänningsdeformation orsakad av yttre miljö.
(Följande är kroknätet för att introducera grunden för formdesign vid formsprutning) ② Temperaturkontrollfel orsakat av temperaturregulator eller värmesystemfel
Restspänningen orsakas huvudsakligen av följande tre tillstånd, dvs. överfyllning, urtagning och utskjutning samt metallinläggning. Som sprickor som produceras i fallet med överskottsfyllning, lösningen kan huvudsakligen vara i följande aspekter:
(1) since the pressure loss of the gate is the smallest, if the cracks are mainly near the gate, the multi-point distribution point gate, side gate and handle gate can be considered.
(2) on the premise that the resin does not decompose or degrade, properly increasing the resin temperature can reduce the melt viscosity, improve the fluidity, and also reduce the injection pressure to reduce the stress.
(3) rent generellt, when the mold temperature is low, it is easy to produce stress, so the temperature should be increased appropriately. But when the injection speed is higher, even if the mold temperature is lower, the stress can be reduced.
(4) too long time of injection and holding pressure will also produce stress, so it is better to shorten it properly or switch holding pressure for th time.
(5) non crystalline resin, such as as as resin, värmebeständighet och kylbeständighet, PMMA resin and so on, is more likely to produce residual stress than crystalline resin, such as polyethylene, polyformaldehyde and so on. When demoulding and pushing out, due to the small demoulding inclination, rough mold glue and punch, the pushing out force is too large, resulting in stress, and sometimes even whitening or cracking around the pushing rod. As long as the location of crazing is carefully observed, the cause can be determined.
It is easy to produce stress and crack after a period of time when the metal parts are embedded at the same time of injection molding. This is mainly due to the great difference between the thermal expansion coefficient of metal and resin, which leads to stress, and with the passage of time, the stress exceeds the strength of the resin material which is gradually deteriorated, resulting in cracks. To prevent the resulting cracking, as an experience, the wall thickness is 7 “with the outside diameter of the embedded metal part
vår, polystyrene is not suitable for inlay, but inlay has the least effect on nylon. Because the coefficient of thermal expansion of glass fiber reinforced resin material is small, it is suitable for embedded parts.
Dessutom, preheating the metal insert before forming has better effect.
(Speciella borr- och gängmaskiner) cracks caused by external stress
The external stress here is mainly caused by the unreasonable design, especially at the sharp corner. According to figure 2-2, R / 7 “- 0.5 ～ 0.7 can be taken.
(Speciella borr- och gängmaskiner) external environment
Chemicals, water degradation caused by moisture absorption, and excessive use of recycled materials will degrade physical properties and produce cracks.
Om JasonMould Industrial Company Limited
Jasonmould är en Kina mögel tillverkare av plastformar- formsprutning, gjutformar, formblåsning av plast, rotationsgjutning, medicinsk formsprutning av plast, två skott formsprutning av plast, insatsgjutning, övergjutning, formsprutning av metall, formsprutning av mikro, formsprutning av pulver, keramisk formsprutning, formsprutning av vätskor, husky formsprutning, hushållsform, gjutform, formverktyg, anpassade formar, porslinformar, snabb prototypverktyg, verktyg för plastprototyp, stanspressverktyg, munstycke och verktyg för mobildelar/ mobiltelefondelar, bildelar, Dammsugare, uppladdningsbara verktyg, telefoner, kopiatorer, datorer, multimediehögtalare, och många andra elektroniska produkter och hushållsapparater. Och även en tillverkare av plastprodukter, mögeltillverkare Kina- plastdelar, vattentank i plast, plastbollar, plastlådor, plastspänne, plastankare, plasthängare, plastsked, rörmontering av plast, tumla av plast, porslin av plast, plastmuggar, plastflaska, plastbricka, kosmetisk behållare av plast, plastfodral, matbehållare av plast, stolar i plast, plastlock, stängning av plastlock, plaströr, vattenledningar av plast, knoppar i plast, plaströr, verktygslådor i plast, plastställ och så vidare.
Kontakt:
Person: James Yuan
Företag: JasonMould Industrial Company Limited
Lägg till: LongGang Village,LongXi Town,BoLuo County,HuiZhou City,GuangDong-provinsen, Kina
Tel: 86-752-6682869
E-post: [email protected]
Webbplats: https://www.jasonmolding.com/custom-injection-molding/
