Kuinka pidentää ruiskuvalukoneen käyttöikää

Plasticized components of the injection molding machine, here refers to: ruuvi, melt barrel, rubber head, rubber ring, rubber gasket.

Kun ruiskuvalukone toimii, the plasticized components are like the wheels of a motor vehicle. As long as they are started, they will be subjected to pressure, impact, friction, and squeeze. For the same tire, driving on a flat road and operating by a skilled driver can often prolong the service life of the tire.

And when driving on uneven roads with lots of sand and gravel, coupled with frequent emergency braking actions, the pattern on the tire surface is quickly polished and scrapped.

Siksi, to ensure that the injection molding machine is always in good condition, it is necessary to clarify the performance of the injection molding machine used, understand the performance and quality of the muovimateriaaleja käytetty, and strengthen the management of the use of the injection molding machine to reduce failure rates, reduce maintenance costs, and extend The purpose of service life.

When the injection molding machine is working, the plasticized components are like the wheels of a motor vehicle. As long as they are started, they will be subjected to pressure, impact, friction, and squeeze. For the same tire, driving on a flat road and operating by a skilled driver can often prolong the service life of the tire.

And when driving on uneven roads with lots of sand and gravel, coupled with frequent emergency braking actions, the pattern on the tire surface is quickly polished and scrapped.Therefore, to ensure that the injection molding machine is always in good condition, it is necessary to clarify the performance of the injection molding machine used, understand the performance and quality of the plastic materials used, and strengthen the management of the use of the injection molding machine to reduce failure rates, reduce maintenance costs, and extend The purpose of service life.

Yleisesti ottaen, the following aspects affect the service life of the plasticizing system of the injection molding machine:

Ensimmäinen, the effect of mechanical wear:

Some modified plastics are added with minerals, lasikuitu, metal powder, jne. The existence of these materials will cause uniform mechanical wear on the screw, kolme pientä osaa ja sulatetynnyri pehmityksen ja ruiskutusprosessin aikana. Nitrattu kerros ja kromipinnoitettu kerros voidaan kiillottaa pois. Kulumisen jälkeen, ruuvin ja sulatteen piipun välinen rako kasvaa, mikä vähentää plastisoivaa vaikutusta, lisää ruiskeen vuotoa, vähentää ruiskutuksen tehokkuutta, ja heikentää käsittelyn tarkkuutta.

Siksi, kulumisen minimoimiseksi ja sen pidentämiseksi plastisoitujen komponenttien käyttöikä, lämpötilaa tulee nostaa sopivasti käsittelyn aikana ja ruuvin nopeutta pienentää. Kromipinnoituksen tai bimetalliliuosten käyttö voi tehokkaammin estää hankausta.Toiseksi, mekaaninen väsymys ja ylikuormitustyö:

Säätimet asettavat tavallisesti matalan lämpötilan työskentelyn ja tavallisesti suuren nopeuden ja korkeapaineisen työn, mikä heikentää asteittain pehmitettyjen komponenttien suorituskykyä. Esimerkiksi, PC- ja PA-muovien käsittelyssä, kun lämpötila ei täytä vaatimuksia, muovin viskositeetti on erittäin suuri. Jos sol-toiminto on pakotettu tällä hetkellä, soolipainetta ja soolivääntömomenttia on lisättävä, mikä lisää ruuvin jännitysväsymistä. Samaan aikaan, koska muovisulan viskositeetti on tällä hetkellä erittäin korkea, ruiskupuristuspainetta ja ruiskutusnopeutta on lisättävä ruiskuvalua varten, mikä lisää kolmen pienen osan iskua ja kuormitusta, ja nopeuttaa niiden kulumista ja rasitusmurtumaa.

Kolmas, inhimilliset tekijät (mukaan lukien toimintavirheet tai laittomat toiminnot, Tee siitä osittain spiraalin muotoinen):

1). Kun metalliepäpuhtaudet sekoittuvat muoviin ja tulevat yhdessä sulatesäiliöön, ekstruusiovaikutuksen vuoksi, ruuvien reunat, uria, rubber rings, rubber gaskets of the screw will be worn to different degrees, which will cause the injection molding process to be unstable and easy Produce black spots and black streaks;

2), artificially add wrong plastic, add high temperature plastic to the melt barrel set to low temperature, resulting in excessive torque of the screw during the sol, causing stress fatigue of the screw;

3) Cold start is a kind of anxious psychology and irresponsible work attitude. When the temperature of the sol cylinder has not reached the set required temperature or has just reached, the residual material in the barrel absorbs the heat from the heating ring to make the temperature higher, while the temperature of the inner layer is still very low. Siksi, during cold start The screw torque is very large, causing stress fatigue on the screw. In severe cases, the screw will be twisted quickly, and the rubber head and rubber ring will be twisted.

Most of the metal impurities entering the sol cylinder are brought in with the crushed material. Siksi, the breakage of the blade of the crusher should be checked frequently, and the blade should be replaced immediately if it is found to be worn.

On the other hand, check and clean the magnets in the blanking hopper frequently. When the metal scraps adsorbed around the magnet are saturated, the adsorption force for the iron scraps on the outer layer will be weakened. Even if it is attracted, it will be easily washed away by the continuously flowing plastic and enter the sol cylinder together.

Neljäs, correctly assemble, debug and replace parts:

This aspect is also very important. If the assembly of the sol barrel is not tight enough, the screw will touch the sol barrel when the sol or glue is injected, causing the screw or sol barrel to wear. Siksi, the technical status of the equipment should be checked regularly, and attention should be paid to the abnormal phenomenon of the parts in the process.Fifth, damage caused by improper workmanship:

1) Long-term use of high back pressure sol can accelerate the wear of the three small plasticized parts. This situation generally occurs when toner is used. Since the toner is difficult to disperse, the method of increasing the back pressure is adopted.

2) For high-viscosity plastics, fast sol is used when sol is used to cause stress fatigue of the screw;

3) For high-temperature plastics, especially glass fiber-added plastics, high-speed sol method should not be used.

Sixth, chemical corrosion:

The corroded metal material is iron. Common corrosive plastics include: flame-retardant plastics, acidic plastics, PVC plastics, jne. After the screw, melt barrel and flange are corroded, some pits are formed on the surface, and the surface is rough, which makes the flow resistance of the melt when the injection molding machine works.

Some materials are easy to adhere to the surface, causing decomposition and carbonization. Severe corrosion will increase the gap between the screw and the melt barrel, lisätä vuotoa, and reduce the injection efficiency.

Whether it is a flame-retardant plastic or an acid glue, the muovi- will decompose acid gas when processed at high temperature, and the plastic melt is easy to be carbonized and stick to the metal. Siksi, on the one hand, the plasticized components should be made of stainless steel or surface chromium plating; toisaalta, low back pressure, low temperature and low shear processes should be used as much as possible in the production and processing to reduce the degradation of the plastic;

In the third aspect, due to the thermal sensitivity of the above plastics, too high temperature or too long heating time.it is easy to decompose, degrade and carbonize the plastics. Siksi, the production process should avoid and reduce artificial shutdowns. If you need to stop the machine, you should lower the temperature first, close the material gate.And after the melt in the sol tube is finished, switch to PP or PS to clean the sol tube before stopping the kone.

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