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Home / Automotive Parts Injection Molding: Stable Thick-Walled Molding with electric injection molding machine

Automotive Parts Injection Molding: Stable Thick-Walled Molding with electric injection molding machine

2026/05/29 By le zhan

electric injection molding machine 6-6

Thick-walled automotive parts place higher demands on molding processes and require longer holding times to maintain their shape. Topsta’s electric injection molding machine are specifically designed for the production of thick-walled automotive parts. By incorporating integrated drives and control algorithms, these machines achieve communication response times as low as 0.125 milliseconds and injection repeatability of ±0.01 millimeters. This eliminates control delays and maintains process stability during critical stages such as the transition to holding pressure. Additionally, custom high-load modules enable hold-pressure durations of up to 30 minutes, which help compensate for shrinkage, prevent sink marks and voids, and improve the yield rate of thick-walled parts such as automotive components.

Why do thick-walled automotive parts require stricter process control?

Thicker parts cool more slowly, experience longer shrinkage periods, and place greater pressure on the hold pressure stage. If the machine cannot precisely control the holding pressure phase, the parts may exhibit issues such as sink marks, voids, or dimensional inconsistencies. Therefore, the selection of the injection molding machine is critical in the injection molding of automotive parts. Thick-walled parts are highly sensitive to process deviations. Even minor changes in injection speed or pressure variations can affect the final result. If the injection molding machine moves too slowly or responds too slowly, the process loses stability. If the injection molding machine cannot precisely repeat the same actions, part quality will vary from batch to batch.

Targeted Process Control Strategies 1

Electric Injection Molding Machine with Integrated Drive and Control for Zero-Latency Response

The primary advantage of Topstar electric injection molding machines lies in their integrated drive-and-control architecture. This design reduces the machine’s communication response time to just 0.125 milliseconds, effectively minimizing control latency during the most critical stages of the injection cycle.

In the production of thick-walled automotive parts, the hold-pressure switch is a critical component. If the machine switches too late, it may cause overfilling of the cavity, leading to stress; if it switches too early, it may fail to fully compensate for shrinkage. The result could be voids, sink marks, or dimensional instability. A fast-responding electric injection molding machine ensures the production process aligns with actual production requirements, thereby reducing this risk.

Electric Injection Molding Machine with Integrated Drive and Control for Zero-Latency Response

±0.01 mm Repeatability Ensures Stable Production

Automotive components typically have very strict tolerance requirements. If the injection position varies too much, melt behavior will change accordingly, affecting the final wall thickness, holding pressure effectiveness, and the structural stability of the part. The integrated control system of Topstar’s electric injection molding machines achieves ±0.01 mm injection repeatability, which helps maintain process stability. With ±0.01 mm repeatability, this electric injection molding machine can control these deviations more effectively.

±0.01 mm Repeatability Ensures Stable Production 1

Long Hold-Pressure and High-Load Modules for Shrinkage Control

The second major advantage of Topstar electric injection molding machines lies in their ability to sustain hold-pressure for extended periods. Thick-walled parts continue to shrink for a longer time after filling, which means they require a longer hold-pressure period to maintain their shape and density. If the hold-pressure phase ends too early, automotive parts may develop sink marks or internal voids.

Topstar utilizes custom high-load modules to achieve a maximum holding time of up to 30 minutes. This feature is particularly important in the injection molding of automotive parts, as it allows the material more time to stabilize within the mold. The machine does not force the part to cool too quickly but instead employs a pressure curve tailored to the characteristics of thick cross-sections.

How long should the holding time be to prevent sink marks and voids?

Sink marks and voids are the two most common quality issues in thick-walled automotive parts. These problems occur when the rate of internal material shrinkage exceeds the rate at which surface shrinkage can be compensated for. Extended holding time helps mitigate this risk by keeping the material in the cavity while the part continues to cool. Topstar’s electric injection molding machines directly address this issue. With longer holding times, the electric IMM can maintain cavity compensation for an extended period. This improves surface quality, enhances internal density, and reduces the risk of hidden defects that may arise during assembly or use.

Electric Injection Molding Machine Is the Optimal Choice for Automotive Parts Molding

Thick-walled products such as automotive components require a balance of strength, precision, and repeatability. They demand both substantial material usage and extended cooling and holding times. In such cases, a stable electric injection molding machine becomes a production advantage. Topstar’s electric injection molding machines feature an integrated drive and control architecture that helps maintain process stability at critical moments. Long holding time modules aid in compensating for shrinkage and preventing sink marks. These features collectively help manufacturers maintain higher product quality across repeated production cycles.

 

 

 

 

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