injection machine purchasing attention (1)

The five major hazards of excessive temperature rise of the máquina moldeo ya inyección 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 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, 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 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. Ar mpat'i 'be̲fi ideal ko ya hidráulico gi 'bu̲i ja 45 ya grado ne 50 Ya grado. 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, nä'ä afectará ar 'be̲fi jar ko. Componentes, ngu cilindros asete, válvulas hidráulicas, etc., reducir ar precisión ar control ne ar sensibilidad respuesta, Ho̲ntho nu'u̲ pa máquinas inyección precisión. Ma xkagentho ar pa, Xähmö nu'bu̲ ar mpat'i xki mextha, 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. Ir, mahyoni da hmihi ndunthe ya Ntheti ja ar mpat'i 'be̲fi ar asete hidráulico. Jawa dí razones pa mextha ar mpat'i ar asete, pe kasu̲ nga̲tho nu'u̲ ar tsa da falla ar circuito asete wa falla ko enfriamiento.
(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. Jar ngäts'i Nxoge, 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. 'Ñotho ar embargo, jar 'ra ya casos, 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.
'Nehe, some special products may need special devices such as pressure accumulators, closed loops, injection compression, etc., to be more efficiently produced. It can be seen that how to determine the appropriate injection molding machine to produce is an extremely important issue. The following information is provided for readers’ reference.
The important factors that usually affect the selection of an máquina inyección include molds, products, plastics, molding requirements, etc. Ir, the following information must be collected or available before making a selection:
Mold size (width, height, thickness), weight, special design, etc.;
The type and quantity of plastics used (single raw material or multiple plastics);
The appearance size (length, width, height, thickness), weight, etc. of the injection molded product; molding requirements, such as quality conditions, production speed, etc.

After obtaining the above information, you can follow the steps below to select a suitable máquina moldeo ya inyección:
1. Select the right model: The model and series are determined by the product and plastic.
Since there are many types of injection molding machines, it is necessary to correctly determine which injection molding machine or series the product should be produced from at the beginning, such as general thermoplastics or bakelite raw materials or PET raw materials. Color, two-color, multi-color, interlayer or mixed color, etc. 'Nehe, some products require conditions such as high stability (closed loop), high precision, ultra-high shooting speed, high shot pressure, or rapid production (multi-loop), and suitable series must also be selected for production.
It can be put down: Determine whether the “Large Column Inner Distance”, “Mold Thickness”, “Mold Minimum Size” y “Die Plate Size” of the machine are appropriate according to the mold size to confirm whether the mold can be put down.
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;
The width and height of the mold must meet the minimum mold size recommended by the injection molding machine, and it will not work if it is too small;
3. Obtain: The mold and the finished product determine whether the “mold opening stroke” y “mold stroke” 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, and the length of the sprue must be included;
The stroke of the supporting mold must be enough to eject the finished product;
4. Lockable: The tonnage of “clamping force” is determined by the product and plastic.
When the raw materials are injected into the mold cavity at high pressure, a mold-supporting force is generated. Ir, Ar xe̲ni sujeción ar máquina moldeo ya inyección da proporcionar xingu “clamping force” pa nu'bu da ar abra ar molde. The calculation of the clamping force requirement is as follows:
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 (cm2) × 'bede ya cavidades molde × presión ar molde (kg yá 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, ne Ntsuni, ndu nzafi sujeción ar máquina suele to 1.17 ya 'nandi dätä da ndu nzafi sujeción;
Jar nuna punto, ya especificaciones ar xe̲ni sujeción ar xi determinado preliminarmente, ne ar tonelaje ar modelo ar xi determinado aproximadamente, 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: Determine the required “injection volume” from the weight of the finished product and the number of mold cavities and select the appropriate “Diámetro ar tornillo”.
To calculate the weight of the finished product, the number of mold cavities (one mold and several cavities) shall be considered;
For the sake of stability, the injection volume needs to be more than 1.35 times the weight of the finished product, Ar mä, the weight of the finished product needs to be within 75% ar volumen inyección;
6. Hño inyección: The conditions such as “nthe compresión ar tornillo” y “presión inyección” are determined by the plastic. 'Ra ya plásticos ingeniería requieren 'nar dätä presión inyección ne 'nar diseño nthe compresión tornillo adecuado pa ga mpädi mäs xi efectos moldeo.. Ir, pa mejorar dá tsi ar producto ar terminado, Ya ndu presión ya inyección ne ya nthe compresión 'nehe tsa ga pe̲ts'i da ja da ar seleccionar ar tornillo. .
Jar ngäts'i Nxoge, a screw with a smaller diameter can provide a higher injection pressure.
7. Shoot fast: and confirm the “shooting speed”.
Some products require high injection rate and rapid injection to form stable molding, such as ultra-thin products. Jar nuna ar nt'ot'e, it may be necessary to confirm whether the injection rate and rate of injection of the machine are sufficient, and whether it needs to be equipped with pressure accumulators, closed-loop control and other devices. Jar ngäts'i Nxoge, under the same conditions, the screw that can provide a higher injection pressure usually has a lower shot speed, Ya ar contrario, the screw that can provide a lower shot pressure usually has a higher shot speed. Ir, when selecting the screw diameter, the injection volume, injection pressure and injection rate (velocidad inyección) need to be cross-considered and selected.
'Nehe, a multi-loop design can also be used to shorten the molding time with synchronized compound actions.

Nu'bu̲ pe̲ts'i uni nt'a̲ni dige moldeo ya inyección ,Jaki ar mäte, sentar bí mpe̲fi ar preguntar Equipo FLYSE,bí daremos xi hño hontho!