Full analysis of the main points of injection molding machine selection: hydraulics, control and mold adaptation

In the field of injection molding processing, injection molding machines are the core equipment, and their performance directly determines the efficiency, quality and stability of production.The hydraulic system, the control system, and the degree of cooperation with the mold are the key elements that cannot be ignored when choosing an injection molding machine.
1. Special requirements of hydraulic system
The hydraulic system can be called the “muscle” of the injection molding machine, providing powerful power for the operation of the equipment.First of all, precise pressure control is a top priority.In different stages of injection molding, such as injection, holding pressure, and cooling, the required pressure is different.When injecting, the hydraulic system is required to output high pressure instantly to ensure that the plastic melt fills the mold cavity quickly and evenly to avoid defects such as short shots. Pressure fluctuations need to be controlled within a very small range, generally less than ±5%, in order to ensure the dimensional accuracy and appearance quality of the product.
Secondly, the response speed should be fast.From the issuance of instructions by the control system to the execution of actions by the hydraulic system, the delay should be as short as possible, which is of great significance for achieving high-speed injection molding and shortening the molding cycle.The response time of the advanced hydraulic system can be controlled within tens of milliseconds, allowing the equipment to quickly adapt to complex and changeable production processes.
Moreover, the oil temperature stability cannot be ignored.Excessive oil temperature can easily cause the viscosity of hydraulic oil to decrease and the seals to age, which in turn affects the pressure stability of the system and the life of the components.Therefore, high-quality injection molding machines are equipped with efficient cooling devices to control the oil temperature at a constant temperature of 30℃-50℃ to ensure the long-term reliable operation of the hydraulic system.
2. Key considerations of the control system
The control system is like the “brain” of an injection molding machine, commanding the entire production process.On the one hand, a high degree of intelligence is the general trend.The control system with intelligent monitoring function can collect equipment operating parameters in real time, such as screw speed, barrel temperature, mold opening and closing position, etc., and analyze these data through built-in algorithms to warn of potential failures in advance, achieve preventive maintenance, and reduce the risk of downtime.
On the other hand, ease of operation is essential.In the face of complex injection molding process adjustments, operators do not need to have deep professional knowledge. Through a simple and intuitive man-machine interface, they can easily complete operations such as parameter setting and program switching.For example, the use of touch screen control, with a graphical process flow chart, so that the operation is clear at a glance, greatly improving production efficiency.
In addition, compatibility is also an essential feature of the control system.With the development of the industry, new injection molding processes and peripheral equipment continue to emerge. The control system needs to have good openness and be able to seamlessly connect various automation equipment, such as robot pickup, online inspection devices, etc., to build intelligent production lines.
3. Ensure the perfect cooperation between the injection molding machine and the mold
The adaptation of injection molding machines and molds is the key link to achieve efficient and stable production.First of all, the mold installation size must be accurately matched.The template size, positioning ring diameter, installation screw hole specifications, etc. of the injection molding machine should fully correspond to the mold to ensure that the mold is firmly installed and positioned accurately, so as to avoid problems such as material leakage and product flying edges caused by improper installation.
Secondly, the opening and closing stroke is highly adapted to the mold.The opening and closing stroke of the injection molding machine should be large enough to meet the opening and closing needs of molds of different heights. At the same time, the speed and pressure need to be reasonably controlled during the opening and closing process.When opening, first fast and then slow to avoid hitting the mold; when closing, it is stable and accurate to prevent damage to the mold and ensure the service life of the mold.
Moreover, the injection volume is coordinated with the volume of the mold cavity.According to the number of mold cavities, product weight and density of plastic raw materials, the required injection volume is accurately calculated. When choosing an injection molding machine, the theoretical injection volume should be 1.2-1.5 times the actual demand to ensure that the plastic melt fully fills the mold without causing waste of raw materials.
Finally, the injection pressure matches the mold runner system.The thickness, length, and layout of the mold runner will affect the flow resistance of the plastic melt. The injection molding machine needs to have adjustable injection pressure and optimize the pressure parameters according to the characteristics of the mold to ensure that the melt smoothly fills the cavity and obtains high-quality products.
In summary, when selecting an injection molding machine, it is necessary to have an in-depth understanding of the special requirements of its hydraulic system and control system, and to accurately grasp the main points of cooperation with the mold, so as to seize the opportunity in injection molding production, achieve efficient, stable and high-quality output, and create greater value for the enterprise.