Injection molding machine control system development and improved consulting services

The modern plastic injection molding machine is a typical system integrating machine, electricity, and liquid. Due to the features such as complex molding products, less post-processing, and many kinds of plastics, the development has been extremely rapid since its inception. More than 80% of the world's engineering plastic products are processed by injection molding machines.

Conventional injection molding machines generally use a simple open-loop control, that is, control according to a preset value. In the equipment manufacturing process, parameter values ​​such as clamping force, cycle time, temperature, etc. are set in advance and are maintained by the machine during the production process. For example, the mold temperature can be maintained by controlling the temperature of the heating fluid, and the plasticization temperature can be maintained by controlling the power of the external heating device. This control method has a simple structure, but has poor anti-interference ability and low control temperature.

At present, more injection molding machines use closed-loop control, which is based on the deviation of the online measured value from the set value. The closed-loop control system uses a negative feedback loop, which has strong anti-jamming capability. When the injection speed, injection pressure, cavity temperature, cavity pressure, melt temperature, and oil pressure are deviated due to interference in the production process, the machine passes the control system. Correct the interference automatically. This control method has strong anti-interference ability and high control accuracy. The more advanced control method is to use a computer to control, that is, build a closed-loop real-time computer control system.

The Chinese injection molding machine industry has not yet had a company with its own injection molding machine control system. All of them directly purchase injection molding machine control systems from third parties and install them on their own injection molding machines. This strategy directly limits the technical content of Chinese injection molding machines. Even if injection molding machine companies have their own injection molding process control processes, it is difficult to implement on third-party control systems because third-party control systems cannot open all their control windows. For enterprise technicians to set up and change. And foreign major injection molding machine companies (such as HUSKY, BATTENFELD, DEMAG, ENGEL, ARBURG, NETSTAL, DR.BOY, etc.) all have their own injection molding machine control systems (PLC & HMI).

In addition to improving the performance of injection molding machines and protecting intellectual property rights and enhancing competitive advantages, it can also greatly enhance the company's ability to innovate, especially in mechanical innovation. To achieve innovation in mechanical structures, etc., there must be a fully autonomous, flexible, and open control system to cooperate.

We have a wealth of experience in the development of control systems for injection molding machines. From the design of the underlying control loops for speed, position, pressure, tonnage, temperature, etc., to the human-machine interface design above, we can all help customers bring technological innovations. Our team has a core R&D staff who has worked for HUSKY's Control Development Group for more than a decade. Many features of HUSKY's POLARIS control platform were introduced by us. We have a deep theoretical foundation and rich practical research and development experience in the design and improvement of injection molding machine control systems. From the control system concept design, function design, system architecture design, algorithm design, program and data structure design, code design, function test, system upgrade, special function addition, production system design, after-sales service, remote diagnosis, machine debugging, etc. We can all provide help and services.

The performance of injection molding machine control system mainly depends on the algorithm of process control, which is the core part of the entire control system.
--- Design of Speed ​​Control Ring
--- Design of Position Control Ring (Open or Closed Loop)
--- Design of clamping force control ring
--- Temperature control loop design (if hydraulic system, oil temperature control is also very critical)
--- Design of pressure control ring
--- Efficient smooth switching between speed control and pressure control
--- Design of closing pressure protection control
--- Design of Multi-Segment Smooth Control Curve Generator
--- Control Output Linearization Design
--- Other system optimization design

Through the above design, the production cycle of the injection molding machine is shortened, the operation is stable, and the efficiency is improved.
A high-end injection molding machine control system, it should also have the following characteristics,
A. Superior part quality
I. Through the adjustment of system control parameters and SPC analysis to ensure the consistency of the control process, anti-jamming, and thus optimize the quality of the product.
II. Open software architecture that can easily change control algorithms to improve product quality
B. Fast Cycle Time
I. Fast PLC program execution cycle;
II. High-performance PC and fast I/O;
III. Rapid communication capabilities of various control components;
IV. Self-correcting and adaptive control methods;
V. Advanced control algorithms for various speeds, pressures, temperatures, and energy-saving control strategies.
C. User friendly design and interface I. Widely use meaningful and realistic icons for intuitive operation;
II. Minimal button operation steps to achieve the fastest information acquisition;
III. Single button operation;
IV. User Programmable Features;
V. Acknowledged precise alarm functions and online help;
VI. Detailed operational event records;

Human Interface (HMI) is the first customer-oriented part of the control system. Its quality directly affects the customer's evaluation of the entire control system. HMI is the control system's clothes. As a good HMI, it should have the following characteristics,
--- Flexible navigation design
--- User level management --- Free language switching --- Free unit switching --- Flexible operation button design --- Alarm/event display and storage --- Record and manage historical data --- Report Production and printing --- SPC function --- Curve display of real-time process data -- Decomposition analysis of production cycle -- Upload/download/copy of control parameters -- Memory storage of personal data of the operator --- Online help

We are willing to provide consulting services for the development and improvement of injection molding machine control systems for injection molding machine companies in China.
A. Improve the control algorithm of its injection molding machine to improve work efficiency;
B. "Object-oriented" software architecture and program development of control systems PLC and HMI;
C. Humane, user-friendly, simple operation, intuitive HMI design and consulting;
D. Human-machine interface development of DHMI based on DRAGONFLY;