Bi-color injection (Bi-color injection), as the name implies, is to use two kinds of plastic injection molding for one part. Two-color injection molding in a broad sense includes over molding, which is achieved by ordinary injection molding machines and two injections. In a narrow sense, two-color injection molding refers to the use of two-color injection molding machines to inject two different plastics on the same machine to complete the parts. The common one is rotary of.
The former does not require high equipment, but the production efficiency is low. It is basically only suitable for the molding of two materials that do not require a high degree of soft and hard rubber. The latter has good application scope and product quality and high production efficiency, which is the current trend.
1.1 Requirements
The matching materials for two-color injection molding must meet two basic compatibility conditions, adhesion compatibility and processing compatibility. In addition, the following requirements must also be met:
(1) Injection unit, parallel and same direction, parallel opposite direction, horizontal and vertical L-shaped, Y-shaped single-cylinder injection structure;
(2) Mixed nozzles, special nozzles such as patterns, waves, flow marks, gradients, and interlayers;
(3) Clamping mold, standard type, vertical turntable type, horizontal turntable type, shaft type, manipulator rotation type and other mechanisms;
(4) Feeding, in addition to the standard hydraulic motor drive, there is also an ESD (ElectricScrewDrive) electric feeding structure;
(5) The oil circuit has ACC accumulator high-speed injection and closed circuit design.
1.2 Features
Powerful performance and high energy saving: After the energy-saving transformation of the injection molding machine, the system can respond quickly, and the injection molding machine can quickly adjust the supply according to its own needs, which can effectively improve the utilization rate of the electric energy of the injection molding machine, thereby achieving high efficiency and energy saving.
Good stability: The system adopts double closed-loop control of pressure and flow, and the supply of the injection molding machine is determined according to the demand of the injection molding machine. Under the action of a given input or external interference, the system can reach a new equilibrium state or return to the original equilibrium state after a short adjustment process.
Good fast response: fast response is one of the important signs of the dynamic quality of the servo system. Due to the short production transition process time, generally within 200ms, in order to achieve the requirements of overshoot, the leading edge of the transition process is required to be steep, and the rate of increase after energy-saving transformation is required. To be larger, the time for the injection molding machine to reach 1500 revolutions is less than 0.03 seconds.
High precision: The precision after transformation refers to the accuracy with which the output can follow the input. The servo motor adopts permanent magnet technology, which is accurate and fast. The servo motor adopts PLC technology, which makes the control more precise. The allowable deviation is generally between 0.01 and 0.00lmm.
Energy-saving: adopting a blank taking system to reduce power consumption.
Improve efficiency while reducing costs: high response, high repeatability, and speed stability are improved; two kinds of raw materials or two colors can be molded at the same time, greatly reducing process and manpower to achieve cost savings; parameter setting, system adjustment is Very simple digital operation.
