attenzjoni tax-xiri tal-magni tal-injezzjoni (1)

The five major hazards of excessive temperature rise of the magna tal-iffurmar tal-injezzjoni huma: deformazzjoni termali tal-magna, viskożità taż-żejt imnaqqsa, deformazzjoni tas-siġilli tal-gomma, ossidazzjoni aċċellerata taż-żejt u deterjorazzjoni, u pressjoni mnaqqsa tal-komponent tal-arja.
Wieħed mill-perikli: deformazzjoni termali tal-magna
The moving parts with different coefficients of thermal expansion in the hydraulic components are stuck due to their smaller fit gaps, causing malfunctions, affecting the transmission accuracy of the hydraulic system, and deteriorating the working quality of the parts.
Harm two: reduce the viscosity of the oil
Excessive temperature rise of the injection molding machine will cause the viscosity of the oil to decrease, iżżid it-tnixxija, and the volumetric efficiency of the pump and the efficiency of the entire system will be significantly reduced. As the viscosity of the oil decreases, the oil film of the sliding valve and other moving parts becomes thinner and cut, and the frictional resistance increases, resulting in increased wear.
Hazard 3: Deformation of rubber seals
Excessive temperature rise of the injection molding machine will deform the rubber seals, accelerate the aging failure, reduce the sealing performance and service life, and cause leakage.
Hazard 4: Accelerate the oxidation and deterioration of oil
Excessive temperature rise of the injection molding machine will accelerate the oxidation and deterioration of the oil, precipitate bituminous substances, and reduce the service life of the hydraulic oil. The precipitates block the damping orifice and the slit valve port, causing the pressure valve to become stuck and unable to move, and the metal pipe is stretched and bent, or even ruptured.
Hazard 5: Leading to poor work quality of components
Excessive temperature rise of the injection molding machine will cause the quality of the parts to deteriorate. The dissolved air in the oil will escape, resulting in air pockets, which will reduce the working performance of the hydraulic system. It-temperatura ideali tax-xogħol tas-sistema idrawlika għandha tkun bejn 45 gradi u 50 gradi. The reason is that the hydraulic system is designed according to a selected pressure oil viscosity.But the viscosity will change with the oil temperature, li se jaffettwa x-xogħol fis-sistema. Komponenti, bħal ċilindri taż-żejt, Valvi idrawliċi, eċċ., Naqqas il-preċiżjoni tal-kontroll u s-sensittività tar-rispons, speċjalment għal magni ta 'injezzjoni ta' preċiżjoni. Fl-istess waqt, Jekk it-temperatura hija għolja wisq, it will accelerate the aging of the seal and cause it to harden and crack.If the temperature is too low, the processing energy will be consumed and the operating speed will be reduced. Għalhekk, huwa meħtieġ li tingħata attenzjoni mill-qrib għat-temperatura tax-xogħol taż-żejt idrawliku. Hemm ħafna raġunijiet għat-temperatura għolja taż-żejt, Iżda ħafna minnhom huma dovuti għan-nuqqas taċ-ċirkwit taż-żejt jew il-falliment tas-sistema tat-tkessiħ.
(1) According to different load requirements, frequently check and adjust the pressure of the overflow valve to make it just right.
(2) Choose hydraulic oil reasonably, especially the oil viscosity. When conditions permit, try to use a lower viscosity to reduce viscosity friction loss.
(3) Improve the lubrication conditions of moving parts to reduce friction loss, which is conducive to reducing work load and heating.
(4) Improve the assembly quality and accuracy of hydraulic components and hydraulic systems, strictly control the clearance of matching parts and improve lubrication conditions. The use of sealing materials with a small friction coefficient and improved sealing structure to reduce the starting force of the hydraulic cylinder as much as possible to reduce the heat generated by the mechanical friction loss.
(5) Add cooling devices when necessary. Ġeneralment, most of the customers who have been engaged in the injection molding industry for many years have the ability to judge by themselves and choose the appropriate injection molding machine to produce. Madankollu, f'xi każijiet, the customer may need the assistance of the manufacturer to decide which injection molding machine to use, or even the customer may only have the product sample or idea, and then ask the manufacturer whether the machine can be produced or which model is compared. Suitable.
Barra minn hekk, xi prodotti speċjali jistgħu jeħtieġu apparat speċjali bħal akkumulaturi tal-pressjoni, linji magħluqa, kompressjoni ta 'injezzjoni, eċċ., biex ikun prodott b'mod aktar effiċjenti. Jista 'jidher li kif tiddetermina l-magna tal-iffurmar tal-injezzjoni xierqa biex tipproduċi hija kwistjoni estremament importanti. The following information is provided for readers’ reference.
The important factors that usually affect the selection of an magna tal-injezzjoni include molds, prodotti, plastik, rekwiżiti tal-iffurmar, eċċ. Għalhekk, l-informazzjoni li ġejja għandha tinġabar jew tkun disponibbli qabel ma ssir għażla:
Daqs tal-moffa (wisa ', għoli, ħxuna), piż, disinn speċjali, eċċ.;
The type and quantity of plastics used (materja prima waħda jew plastiks multipli);
Id-daqs tad-dehra (tul, wisa ', għoli, ħxuna), piż, eċċ. tal-prodott iffurmat bl-injezzjoni; rekwiżiti tal-iffurmar, bħal kundizzjonijiet ta 'kwalità, veloċità tal-produzzjoni, eċċ.

Wara li tikseb l-informazzjoni ta 'hawn fuq, you can follow the steps below to select a suitable magna tal-iffurmar tal-injezzjoni:
1. Agħżel il-mudell it-tajjeb: Il-mudell u s-serje huma determinati mill-prodott u l-plastik.
Peress li hemm ħafna tipi ta 'magni tal-iffurmar tal-injezzjoni, huwa meħtieġ li jiġi ddeterminat b'mod korrett minn liema magna jew serje għall-iffurmar tal-injezzjoni għandu jkun prodott il-prodott mill-bidu, bħal termoplastiċi ġenerali jew materja prima tal-bakelite jew materja prima tal-PET. Kulur, b'żewġ kuluri, b'ħafna kuluri, saff ta 'bejn is-saffi jew kulur imħallat, eċċ. Barra minn hekk, xi prodotti jeħtieġu kundizzjonijiet bħal stabbiltà għolja (linja magħluqa), preċiżjoni għolja, veloċità ta 'sparar ultra-għolja, pressjoni għolja ta 'sparatura, jew produzzjoni mgħaġġla (multi-loop), and suitable series must also be selected for production.
Jista 'jitniżżel: Iddetermina jekk “Large Column Inner Distance”, “Mold Thickness”, “Mold Minimum Size” u “Die Plate Size” tal-magna huma xierqa skont id-daqs tal-moffa biex jikkonfermaw jekk il-moffa tistax titpoġġa.
The width and height of the mold must be smaller than or at least one side smaller than the inner distance of the large column;
The width and height of the mold should be within the size range of the mold plate;
The thickness of the mold must be between the mold thickness of the injection molding machine;
Il-wisa 'u l-għoli tal-moffa għandhom jilħqu d-daqs minimu tal-moffa rakkomandat mill-magna tal-iffurmar tal-injezzjoni, u ma jaħdimx jekk ikun żgħir wisq;
3. Obtain: The mold and the finished product determine whether the “puplesija tal-ftuħ tal-moffa” u “puplesija tal-moffa” are sufficient to take out the finished product.
The mold opening stroke must be at least more than twice the height of the finished product in the direction of opening and closing the mold, u t-tul tal-sprue għandu jkun inkluż;
The stroke of the supporting mold must be enough to eject the finished product;
4. Jistgħu jissakkru: It-tunnellaġġ ta ' “forza tal-ikklampjar” huwa determinat mill-prodott u l-plastik.
Meta l-materja prima tiġi injettata fil-kavità tal-moffa bi pressjoni għolja, tiġi ġġenerata forza li ssostni l-moffa. Għalhekk, l-unità tal-ikklampjar tal-magna tal-iffurmar tal-injezzjoni għandha tipprovdi biżżejjed “forza tal-ikklampjar” biex tevita li l-moffa tinfetaħ. Il-kalkolu tar-rekwiżit tal-forza tal-ikklampjar huwa kif ġej:
Calculate the projected area of ​​the finished product in the direction of the switch mold from the appearance size of the finished product;
Die support force = projected area of ​​the finished product in the direction of the switch mold (ċm2) × numru ta 'kavitajiet tal-moffa × pressjoni fil-moffa (kg / cm2);
The pressure in the mold varies with the raw materials, generally 350～400kg/cm2 for raw materials;
The clamping force of the machine must be greater than the clamping force, u għal raġunijiet ta 'sigurtà, il-forza tal-ikklampjar tal-magna hija ġeneralment 1.17 darbiet akbar mill-forza tal-ikklampjar;
F'dan il-punt, l-ispeċifikazzjonijiet tal-unità tal-ikklampjar ġew determinati preliminarjament, u t-tunnellaġġ tal-mudell ġie ddeterminat bejn wieħed u ieħor, and then the following steps must be carried out to confirm which injection unit has a screw diameter that meets the requirements.
5. Full injection: Iddetermina dak meħtieġ “volum tal-injezzjoni” mill-piż tal-prodott lest u n-numru ta 'kavitajiet tal-moffa u agħżel dak xieraq “dijametru tal-kamin”.
To calculate the weight of the finished product, the number of mold cavities (moffa waħda u diversi kavitajiet) shall be considered;
For the sake of stability, the injection volume needs to be more than 1.35 darbiet il-piż tal-prodott lest, jiġifieri, the weight of the finished product needs to be within 75% tal-volum tal-injezzjoni;
6. Injezzjoni tajba: The conditions such as “proporzjon tal-kompressjoni tal-kamin” u “pressjoni ta 'injezzjoni” huma determinati mill-plastik. Xi plastiks ta 'l-inġinerija jeħtieġu pressjoni ta' injezzjoni ogħla u disinn xieraq tal-proporzjon tal-kompressjoni tal-kamin biex ikollhom effetti ta 'molding aħjar. Għalhekk, sabiex il-prodott lest jinqabad aħjar, il-ħtiġijiet tal-pressjoni tal-injezzjoni u l-proporzjon tal-kompressjoni għandhom jiġu kkunsidrati wkoll meta tagħżel il-kamin. .
Ġeneralment, kamin b'dijametru iżgħar jista 'jipprovdi pressjoni ta' injezzjoni ogħla.
7. Rimja malajr: u kkonferma l- “veloċità tal-isparar”.
Some products require high injection rate and rapid injection to form stable molding, such as ultra-thin products. F'dan il-każ, jista 'jkun meħtieġ li jiġi kkonfermat jekk ir-rata ta' injezzjoni u r-rata ta 'injezzjoni tal-magna humiex biżżejjed, u jekk hemmx bżonn li jkun mgħammar b'akkumulaturi tal-pressjoni, kontroll taċ-ċirku magħluq u apparat ieħor. Ġeneralment, taħt l-istess kondizzjonijiet, the screw that can provide a higher injection pressure usually has a lower shot speed, anzi, the screw that can provide a lower shot pressure usually has a higher shot speed. Għalhekk, meta tagħżel id-dijametru tal-kamin, il-volum tal-injezzjoni, pressjoni ta 'injezzjoni u rata ta' injezzjoni (veloċità tal-injezzjoni) għandhom jiġu kkunsidrati u magħżula.
Barra minn hekk, disinn multi-loop jista 'jintuża wkoll biex jitqassar il-ħin tal-iffurmar b'azzjonijiet komposti sinkronizzati.

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