The main parts of small horizontal injection molding machine are made of high-strength steel and high-quality alloy materials. High-strength steel has high tensile strength and yield strength, and can withstand injection pressure and impact. For example, the tensile strength of special steel can reach hundreds of MPa or higher, ensuring the stability and durability of injection molding machine under long-term high-load operation. High-quality alloy materials change the microstructure and performance by adding elements, and have high hardness, heat resistance, corrosion resistance and good thermal conductivity. The hardness can reach HRC60 or above, which can resist wear and corrosion, and conduct heat to keep the mold temperature stable.
Features
1. Small Footprint: The small horizontal injection molding machine has a compact design and the floor space is only a fraction of that of a traditional large injection molding machine. Some small horizontal injection molding machines occupy an area of only 2 square meters, while a traditional injection molding machine with the same production capacity may require more than 10 square meters of space. This gives small horizontal injection molding machines significant advantages in workshop layout and space utilization, especially suitable for factories or workshops with limited space.
2. Multifunctionality: Small horizontal injection molding machines usually have multiple functions, such as automatic feeding, automatic temperature control, automatic demoulding, etc. These functions enable the small horizontal injection molding machine to meet the production needs of different types of plastic products, improving equipment utilization and flexibility. Small horizontal injection molding machines are capable of producing more than 50 different shapes and sizes of plastic products.
3. Automation Level: Small horizontal injection molding machines are usually equipped with automatic control systems and sensors to enable automated production. These systems can automatically adjust injection molding parameters, monitor production status, and collect production data, improving production efficiency and product quality. Nowadays, the automation level of small horizontal injection molding machines has reached more than 90%.
Platen dimensions
Machine dimensions
Small horizontal injection molding machines transform plastic pellets into finished plastic parts with complex designs and sizes. The machine achieves this through a series of steps, taking advantage of the properties of hot melt plastics.
The injection molding process begins with the plasticizing phase. During this phase, plastic pellets are fed into the machine's hopper and conveyed to a heating and plasticizing mechanism. This mechanism typically consists of a barrel and a screw, which operates at temperatures ranging from 150°C to 300°C, depending on the type of plastic used. The screw rotates and moves backward, mixing and melting the plastic pellets into a uniform molten state. The molten plastic is then maintained at a constant temperature and pressure to ensure uniformity and injection-ready condition.
Next, the injection phase takes place. The screw, now filled with molten plastic, is propelled forward with tremendous force, pushing the plastic through the nozzle into the mold cavity. Injection pressures range from 50 to 200 MPa, depending on the complexity and size of the plastic part being produced. This high-pressure injection ensures that the molten plastic fills every corner of the mold cavity, accurately replicating the design of the mold.
Once the mold is filled, the compression phase begins. The pressure control system maintains constant pressure on the molten plastic for a specified time, usually a few seconds to a minute. This stage is critical to ensure that the plastic part achieves the desired density and dimensional accuracy. The pressure applied during this stage can vary but is usually maintained at around 50-70% of the injection pressure to prevent over-compression and warping of the part.
Following compression is the cooling stage. The mold, and the plastic part inside, are cooled by circulating cooling water or oil in cooling channels embedded in the mold. Cooling time can vary depending on the thickness of the plastic part and the type of plastic used but is usually between a few seconds and a few minutes. Effective cooling solidifies the plastic part so that it retains its shape and size after being ejected from the mold.
Finally, the mold opening stage begins. After the plastic part has cooled sufficiently, the mold opens and the ejection system pushes the part out of the mold cavity.
FAQ
1. What are the main structures of a small horizontal injection molding machine?
A small horizontal injection molding machine is mainly composed of an injection unit, clamping unit, control unit, and hydraulic unit. The injection unit is responsible for plasticizing and injecting plastic, the clamping unit is used for opening and closing of mold and ejection of products, the control unit is the "brain" of injection molding machine, responsible for controlling the entire injection molding process, and the hydraulic unit provides power for injection molding machine.
2. How does the injection unit of a small horizontal injection molding machine work?
The injection unit feeds plastic particles into the barrel through the screw and changes the plastic from solid to liquid (plasticization) under the action of the heating ring. Then, the screw moves forward under the drive of the oil cylinder and injects the plasticized plastic into the mold cavity of the mold.
3. What is the role of the clamping unit in a small horizontal injection molding machine?
A small horizontal injection molding machine is used for opening and closing of mold and ejection of products. At the beginning of work, the clamping unit closes the two parts of the mold to form a relatively closed cavity; at the end of work, the clamping unit opens the mold and ejects the molded product through the ejection mechanism.
4. What parts does the control unit of a small horizontal injection molding machine include?
The control unit usually includes a power supply, programmable logic controller (PLC), relay, and CPU. These parts work together to achieve precise control of the injection molding process.
5. What role does the hydraulic unit play in a small horizontal injection molding machine?
The hydraulic unit is the power source of the injection molding machine. It delivers hydraulic oil to each cylinder through an oil pump to drive the movement of various moving parts during the injection molding process.
6. What is the clamping force of a small horizontal injection molding machine?
The clamping force refers to the maximum pressure that the clamping unit can generate when clamping the mold. The clamping force of a small horizontal injection molding machine is usually between a few tons and tens of tons.
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