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How does machine communication latency affect key stages of the injection molding process?

2026/07/27 By le zhan

How does machine communication latency affect key stages of the injection molding process

The injection molding process is, by its very nature, a continuous interaction between the control system, drive units, and mechanical components. Every motion command, feedback signal, and corrective action must first pass through the control system before the machine can respond. When communication is delay-free, the injection molding machine can operate precisely according to the preset process curve. However, delays between command transmission and mechanical response can affect critical molding stages, leading to deviations in filling behavior, pressure transitions, dimensional stability, and ultimately, product quality.

Traditional electric injection molding machines typically employ a layered communication architecture:

Control → Drive → Mechanism

In this architecture, the controller sends commands to the drive system, which then controls motor movement. At the same time, feedback signals are transmitted through the same layers. Although this architecture provides reliable operation, each communication layer introduces additional processing time. These minute delays accumulate, affecting the stability of the entire injection molding process.

The Impact of Communication Delays on the Injection Molding Process

Modern injection molding is not merely a process of mechanical motion, but rather a highly coordinated interaction among control algorithms, servo drives, motors, mechanical transmission systems, and other components:

During production, the injection molding machine continuously receives and processes information.

For example:

  • The controller calculates the required injection speed.
  • The command is sent to the drive system.
  • The drive controls the motor’s operation.
  • The mechanical system executes the motion.
  • Feedback information is returned to the controller for correction.

This closed-loop process enables the machine to maintain stable operation. However, the efficiency of this loop depends largely on the communication speed. If the feedback cycle is too long, the controller cannot immediately ascertain the actual mechanical state. Consequently, the machine may continue to operate based on outdated information.

For general injection molding applications, this delay may not cause noticeable problems. However, for precision injection molding—where products demand extremely high dimensional and surface finish stability—communication delays become a major limiting factor.

The Impact of Communication Delays on the Injection Molding Process

Injection Molding Process Accuracy Is Affected by Traditional Tiered Communication Methods

Traditional electric injection molding machines typically employ a tiered control structure:

Control System → Drive System → Mechanical System

In this architecture, the controller manages process commands; the drive converts instructions into motion; and the mechanical system executes the motion. These three distinct functional modules are separated:

Although this structure simplifies system management, it increases the number of communication steps. This is because each step requires data transmission, signal processing, command conversion, and feedback calculation. During high-speed injection, these minute delays can affect real-time control performance. This results in a discrepancy between the expected process position and the actual mechanical position. The smaller this gap, the more stable the injection molding process will be.

Increased Communication Delay Leads to Decreased Process Quality

Communication delay affects several critical stages of injection molding.

1. Injection Filling Stage:

During the injection filling process, the screw must follow a precise speed curve. If communication response is delayed, the following situations may occur:

  1. The actual injection speed may deviate from the target value;
  2. Melt flow stability may decrease;
  3. Filling equilibrium may become unstable.

For products with thin walls or complex structures, even minor speed variations can cause flow marks, weld line defects, and uneven surface finishes.

2. V-P Transition Phase:

The transition from speed control to pressure control is one of the most sensitive phases of the injection molding process. During this period, the injection molding machine must accurately monitor screw position, filling status, and cavity pressure conditions.

If communication delays occur, the transition point may occur slightly earlier or later than scheduled. This can lead to over-holding (overfilling), under-holding, dimensional deviations, and internal stress.

For automotive lighting components with extremely high optical performance requirements, unstable pressure switching directly affects light transmission and surface quality.

3. Holding Pressure Phase:

During the holding pressure phase, the injection molding machine compensates for material shrinkage. Response delays may lead to pressure fluctuations, uneven compensation, and product deformation. High-precision parts require stable holding pressure control throughout the entire cooling period. Therefore, reducing communication delays helps maintain product consistency.

How Does Topsta’s Discrete Intelligent Drive Communication Reduce Communication Latency?

With users’ growing demand for high-precision molding, traditional control architectures cannot meet these requirements. Modern injection molding processes are evolving toward higher injection speeds, the production of complex product structures, stricter dimensional tolerances, and higher optical and surface quality requirements.

Against this backdrop, electric injection molding machines, in particular, must not only provide sufficient mechanical power but also respond quickly and precisely to every process change.

The shorter the communication cycle, the more precisely the machine can reproduce the preset molding curve. To address this challenge, Topsta independently developed its Discrete Intelligent Drive technology, optimizing the interaction between the control system and the drive system.

Unlike traditional hierarchical communication, the Discrete Intelligent Drive reduces unnecessary communication steps and shortens the feedback cycle between command output and mechanical response.

The principle can be summarized as follows:

Discrete Intelligent Drive:

Control → Intelligent Drive → Mechanical Response → Real-time Feedback

By shortening the distance between control calculations and mechanical execution, electric injection molding machines achieve faster response times and more precise motion control.

Discrete intelligent drive1

Communication Response Time of 0.125 ms

One of the most significant advantages of Tosda’s electric injection molding machines is their extremely fast communication response time. Thanks to this patented integrated drive and control algorithm, the communication response time has been improved to:

0.125 ms

This means the machine can detect changes and execute corrections almost instantly. For injection molding production, this improvement delivers several significant benefits, including:

Faster process adjustments:

During the injection molding process, process conditions are constantly changing. Factors such as material viscosity, mold temperature, injection resistance, and product geometry all affect the actual molding results. Faster control response enables the machine to adjust operating conditions more quickly, thereby maintaining the expected process curve.

Improved Injection Repeatability:

Communication speed directly affects motion repeatability. Topstar electric injection molding machines achieve:

Injection position repeatability: ±0.01 mm

This precision ensures that every molding cycle follows the same injection position and pressure switch points. For manufacturers producing high-value components, repeatability is not merely a technical parameter—it directly impacts product consistency, production yield, and manufacturing costs. A deviation of just a few micrometers in the injection position can determine whether a product meets quality requirements.

Communication Response Time of 0.125 ms

Real-Time Control Enhances Injection Molding Process Stability

The primary advantage of discrete intelligent drives lies not only in faster communication speeds. More importantly, they establish a closer connection between machine intelligence and mechanical execution.

Traditional communication-based control often suffers from information lag, resulting in a time difference between the intended and actual movements.

Discrete intelligent drive minimizes this discrepancy. Its drive system can directly participate in intelligent control decisions, thereby achieving faster correction responses, more precise positioning, and more stable pressure control. During production, even slight fluctuations in filling speed or pressure switching can lead to visible defects. By reducing communication latency, Topstar’s electric injection molding machines can maintain more consistent process conditions and improve injection molding process reliability.

Discrete Intelligent Drive Communication Improves Injection Molding Process Quality

Electric injection molding machines equipped with discrete intelligent drives achieve:

  • 0.125-millisecond communication response time
  • Injection position repeatability of ±0.01 mm
  • Faster process adjustments
  • More stable molding performance

By shortening the time between commands and actions, manufacturers can control each stage of the injection molding process with greater precision. For companies pursuing high-quality production, injection molding depends not only on more powerful machines but also on smarter, faster communication between every component in the system.

 

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