як вибрати машину для лиття під тиском

There are two templates on the машина для лиття під тиском, один не рухається, називається фіксованим шаблоном; інший можна перемістити, називається рухомим шаблоном. Прес-форма фіксується на двох шаблонах відповідно гвинтами та притискними пластинами. Коли форма відкривається, пересувається рухомий шаблон машини для лиття під тиском, тим самим відкриваючи форму.

After the цвіль is manufactured, it is necessary to carry out injection molding, put on the injection molding machine, and start to produce products. Однак, there are many models of injection molding machines, and each injection molding machine has its own parameters. The design mold must be able to meet the requirements of the injection molding machine model provided by the customer, otherwise it will not be able to produce. До

There are many design parameters of the injection molding machine. The following will focus on several parameters related to the mold. I hope that readers will pay attention to the specific design of the mold. До

1. Injection volume
The injection volume is the maximum mass value (or volume value) that the injection molding machine can shoot at one time during production, and represents the maximum injection capacity of this type of injection molding machine. The amount of melt used in the designed mold is less than the injection volume of the injection molding machine. Otherwise, the product is dissatisfied and cannot be produced. До

2. Сила затиску
What happened was the pressing force of the injection molding machine on the template when the mold was closed. The clamping force required for the molded product during molding must be less than the rated clamping force of the selected injection molding machine. Otherwise, the molten glue will easily run off the parting surface, resulting in flash.

3. Tie rod spacing
There are four tie rods in the dead corners of the fixed template and the movable template of the injection molding machine. Their function is to ensure that the injection molding machine has sufficient strength and rigidity, and at the same time is responsible for the sliding template. Однак, it tends to limit the overall dimensions of the mold, because the mold is hoisted in from the middle of the tie rod during installation. До

The dimensions of the mold cannot be larger than the distance between the tie rods. If the length of the mold exceeds the distance between the tie rods, check whether the mold is hoisted into the rod workshop by rotating. If the rotary hoisting cannot be carried out, then the mold size can only be changed. , Or replace the injection molding machine. До

4. Nozzle size check
The nozzle head of the injection molding machine is generally spherical. When selecting the sprue sleeve, the spherical radius of the sprue sleeve should be consistent with the spherical radius of the nozzle. In order to prevent the high-pressure melt from overflowing from the contact gap between the nozzle and the sprue sleeve, the spherical radius of the sprue sleeve should generally be larger than the nozzle radius. В той самий час, the size of the small end of the main runner should also be slightly larger than the size of the nozzle hole. Easy to align the muzzle

The design of the gating system is an important part of the design of the injection mold. It has a direct impact on the injection molding cycle and the quality of the plastic parts (such as appearance, physical properties, dimensional accuracy, тощо.).

The following principles must be followed when designing
(1) The cavity layout and gate opening position should be symmetrical to prevent the mold from being subjected to unbalanced load and causing flashing.
(2) The arrangement of cavities and gates should reduce the overall dimensions of the mold as much as possible.
(3) The system flow channel should be as short as possible, and the cross-sectional size should be appropriate (too small, the pressure and heat loss will be large, and too large, the plastic consumption will be large); minimize the bending, and the surface roughness should be low to make the heat and pressure loss As small as possible.
(4) For multiple cavities, the plastic melt should enter the depths and corners of each cavity at the same time as much as possible, тобто, the runners should be arranged in a balanced manner as much as possible
(5) On the premise that the cavity is full, the volume of the pouring system should be as small as possible to reduce the consumption of plastic.
(6) The gate position should be appropriate, try to avoid impacting the insert and the small core to prevent the core from deforming. The residual marks of the gate should not affect the appearance of the plastic part.

Five hazards of high temperature of машина для лиття під тиском
The five major hazards of excessive temperature rise of the injection molding machine are: thermal deformation of the machine, reduced oil viscosity, deformation of rubber seals, accelerated oil oxidation and deterioration, and reduced air component pressure.

One of the hazards: thermal deformation of the machine
The moving parts with different coefficients of thermal expansion in the hydraulic components are stuck due to their smaller fits, 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, increase the leakage, 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 friction 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 машина для лиття під тиском will result in poor working quality of the parts, and the dissolved air in the oil will escape, resulting in air pockets, which will reduce the working performance of the hydraulic system. Ідеальна робоча температура гідравлічної системи повинна бути між 45 градусів і 50 градуси. Причина в тому, що гідравлічна система розроблена відповідно до вибраної в'язкості масла під тиском, але в'язкість буде змінюватися з температурою масла, що вплине на роботу в системі. Компоненти, наприклад, масляні циліндри, гідравлічні клапани, тощо., знизити точність керування та чутливість реакції, особливо для точних ін'єкційних машин.

В той самий час, if the температура is too high, це прискорить старіння ущільнювача і призведе до його затвердіння і тріщин; якщо температура занадто низька, the processing energy will be consumed and the operating speed will be reduced. Тому, необхідно уважно стежити за робочою температурою гідравлічного масла. Причин високої температури масла багато, але більшість з них пов’язана з поломкою масляного контуру або несправністю системи охолодження.

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