injection molding Machining Process

Raw Material Pretreatment and Melting：

We first rigorously dry the carefully selected polymer raw material pellets to remove moisture and ensure a high-quality starting point. The raw material is then fed into the Injection molding machine barrel and, through precise gradient heating in each heating zone (including the feeding, compression, and homogenization zones), uniformly and stably plasticized into a molten state. Temperature control during this process is crucial and must be strictly set according to the material's characteristics (such as ABS, PC, and PP) to avoid thermal degradation and ensure good melt flowability, preparing the melt for the next injection step.

Precision Metering and Injection Control：

Once the raw material reaches the ideal melt state, the Injection Molding Machine's precision screw, driven by a servo system, advances, precisely metering and injecting the material. A closed-loop control system monitors screw displacement and speed, ensuring a highly consistent amount of melt injected into the mold for each shot. This is crucial for ensuring product dimensional stability and weight uniformity, crucial for precision electronic and medical components.

High-Pressure Filling and Constant-Pressure Holding：

Molten plastic is rapidly injected into the sealed mold cavity under extremely high injection pressure through the nozzle and mold runner system. We utilize multi-stage injection speed and pressure control to precisely fill every detail of the cavity. After injection, the system immediately transitions to the holding phase, maintaining a constant pressure to continue adding material to the mold to offset the natural shrinkage of the plastic during cooling, thereby preventing defects such as shrinkage and sink marks. This ensures the product's shape is intact, its interior is dense, and its contours are sharp.

Efficient Cooling and Solid-State Forming：

After the holding phase, the part enters the cooling and forming phase within the mold. The mold's built-in cooling circuit activates, circulating a controlled coolant (ambient-temperature water or oil) to remove heat and gradually solidify the molten plastic into the desired shape. The cooling time is scientifically calculated to minimize cycle time and maximize production efficiency while ensuring sufficient cooling and deformation of the part.

Automated Mold Opening and Part Ejection：

After the part has cooled and formed, the injection mold's movable platen moves backward, automatically opening the mold. The ejector plate then advances under hydraulic or mechanical force, smoothly ejecting the molded part from the mold cavity. During this process, we typically integrate a six-axis robotic arm to precisely remove parts from the mold, automatically separating and placing the parts from runner waste. This ensures efficient, unmanned, and continuous operation, significantly reducing quality fluctuations and production time wasted due to human intervention.

Fully Closed-Loop and Circular Production：

This completes the injection molding cycle. After the part is removed, the mold immediately closes, and the injection molding machine automatically enters the next production cycle. All steps—from melt formation, injection, holding pressure, cooling, to mold opening and ejection—are repeated repeatedly according to pre-set automated procedures. Our central control system (PLC) monitors the entire process in real time, ensuring stable parameters at every stage, thereby achieving high-quality, efficient, and continuous batch production.

Permanent Temperature Control and Energy Efficiency Management：

Temperature control is an integral part of the Injection Molding Process. We not only control the temperature of each barrel section, but also independently implement closed-loop control of the mold temperature to ensure process stability and product repeatability. At the same time, we actively adopt advanced technologies such as servo energy-saving power systems and heat recovery to significantly reduce equipment energy consumption. While ensuring excellent quality, we save production costs for customers and practice the concept of green manufacturing.