dak li jaffettwa l-falliment ta 'molding ta' injezzjoni ta 'preċiżjoni

Il-bażi biex tiġġudika l-preċiżjoni iffurmar bl-injezzjoni hija l-eżattezza tal-prodotti ffurmati bl-injezzjoni, jiġifieri, it-tolleranzi dimensjonali, tolleranzi ġeometriċi u ħruxija tal-wiċċ tal-prodotti.

Biex twettaq iffurmar ta 'injezzjoni ta' preċiżjoni, għandu jkun hemm ħafna kundizzjonijiet rilevanti, u l-aktar essenzjali huma l-erba 'fatturi bażiċi tal-materjali tal-plastik, forom tal-injezzjoni, proċess tal-iffurmar tal-injezzjoni u tagħmir tal-iffurmar tal-injezzjoni.

Meta tfassal prodotti tal-plastik, inġinerija materjali tal-plastik għandhom jintgħażlu l-ewwel, u plastiks tal-inġinerija li jistgħu jiġu ffurmati b'injezzjoni ta 'preċiżjoni għandhom jagħżlu dawk il-materjali bi proprjetajiet mekkaniċi għoljin, stabbiltà dimensjonali, reżistenza tajba għat-tkaxkir, u reżistenza għall-qsim tal-istress ambjentali.

It-tieni, dak xieraq magna tal-iffurmar tal-injezzjoni tal-kina għandhom jintgħażlu skond il-materjal tal-plastik magħżul, preċiżjoni dimensjonali tal-prodott lest, piż parti, rekwiżiti ta 'kwalità u struttura tal-moffa mistennija.

Fil-proċess tal-ipproċessar, il-fatturi li jaffettwaw il-prodotti ffurmati bl-injezzjoni ta 'preċiżjoni ġejjin prinċipalment mill-eżattezza tal-moffa, tnaqqis fl-injezzjoni, u l-firxa ta 'bidliet fit-temperatura ambjentali u l-umdità tal-prodott.

Fil-preċiżjoni iffurmar bl-injezzjoni, the mold is one of the keys to obtain precision plastic products that meet the quality requirements. The mold used for precision injection molding should truly meet the requirements of product size, accuracy and shape.

But even if the precision and size of the mold are the same, the actual size of the molded plastic products will be inconsistent due to the difference in shrinkage. Għalhekk, it is very important to effectively control the shrinkage rate of plastic products in precision injection molding technology.

Whether the mold design is reasonable or not will directly affect the shrinkage rate of the plastic product. Because the size of the mold cavity is calculated by adding the estimated shrinkage rate to the size of the plastic product, ir-rata ta 'jinxtorob hija rakkomandata mill-manifattur tal-plastik jew mill-manwal tal-plastik tal-inġinerija.

Mhux biss relatat mal-forma tal-bieb, pożizzjoni tal-bieb u distribuzzjoni tal-moffa, iżda wkoll għall-orjentazzjoni tal-kristall (anisotropija) tal-plastik tal-inġinerija, il-forma u d-daqs tal-prodotti tal-plastik, id-distanza għall-bieb u l-Post relatati.
Lil
Il-fatturi ewlenin li jaffettwaw it-tnaqqis tal-plastik huma t-tnaqqis termali, tnaqqis fil-bidla fil-fażi, jinxtorob orjentazzjoni, jinxtorob tal-kompressjoni, u l-irkupru elastiku. Dawn il-fatturi li jinfluwenzaw huma relatati mal-kundizzjonijiet tal-iffurmar jew il-kundizzjonijiet operattivi ta 'prodotti ffurmati b'injezzjoni ta' preċiżjoni.

Għalhekk, ir-relazzjoni bejn dawn il-fatturi li jinfluwenzaw u l-kundizzjonijiet tal-injezzjoni u l-fatturi tad-dehra tagħhom għandhom jiġu kkunsidrati meta tiddisinja l-moffa, such as injection pressure and cavity pressure and filling speed, injection melt temperature and mold temperature, mold structure and gate form and distribution , And the influence of factors such as gate cross-sectional area, product wall thickness, reinforcing filler content in plastic materials, crystallinity and orientation of plastic materials.

The influence of the above factors is also different due to different plastic materials, other molding conditions such as temperature, humidity, continued crystallization, internal stress after molding, and changes in the injection molding machine. Lil

Because the injection molding process is a process of transforming plastic from solid (powder or pellets) to liquid (melt) to solid (prodott). From pellets to melt, and then from melt to product, the temperature field, stress field, flow field, and density field are in the middle.

Under the combined action of these fields, different plastics (thermosetting or thermoplasticity, crystallinity) Or non-crystalline, reinforced or non-reinforced, eċċ.) have different polymer structural morphology and rheological properties.
All the factors that affect the above-mentioned “field” will definitely affect the physical and mechanical properties, daqs, forma, precision and appearance quality of plastic products.

B'dan il-mod, the internal connection between process factors u polymer properties, structural morphology and plastic products will be manifested through plastic products. A clear analysis of these internal connections is of great significance to rationally formulating the injection molding process, rationally designing and manufacturing molds according to drawings, and even rationally selecting injection molding equipment.

Precision injection molding and ordinary injection molding are also different in injection pressure and injection rate. Precision injection molding often uses high-pressure or ultra-high-pressure injection and high-speed injection to obtain a smaller mold shrinkage rate.
Lil
Based on the above reasons, in addition to the general mold design elements, the following points must be considered when designing precision injection mold:
① Use appropriate mold size tolerance;
②Prevent molding shrinkage errors;
③Prevent injection deformation;
④Prevent demoulding deformation;
⑤ Minimize the mold manufacturing error;
⑥ Prevent errors in mold accuracy;
⑦Keep the precision of the mould.

Jekk għandek xi mistoqsijiet dwar industrija tal-plastik,our tim FLYSE will give you best service！

Whatsapp / Wechat 008618958305290