Injection Molding Controller Cavity Segmentation
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Solution Overview
Problem
In injection molding systems, when a defective part is identified among a batch of molded parts, the entire batch is often discarded, leading to unnecessary consumption of molding material, as existing systems do not efficiently differentiate and reuse good parts.
Innovation Solution
An injection molding system with a controller that determines the quality of molded parts and prevents injection into cavities used for good parts in subsequent cycles, allowing only defective parts to be re-molded, thereby reducing material waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all molded parts are discarded when one part is defective, then quality control is simplified, but molding material is consumed uselessly
Solution Approach 1:
The invention segments the molded parts into defective parts and good parts based on quality determination. The controller identifies which specific cavities produced defective parts and selectively prevents injection only to those cavities in subsequent cycles, while allowing injection to continue in cavities that produced good parts. This segmentation approach resolves the contradiction by avoiding blanket discarding of all parts while maintaining quality control.
Solution Approach 2:
The invention applies local quality control by treating different cavities differently based on their performance. Instead of uniform treatment of all cavities, the system identifies specific cavities with defects and applies targeted prevention measures only to those cavities, while other cavities continue normal operation. This local differentiation reduces material waste while maintaining overall quality standards.
2Productivity
If injection molding is performed to all cavities in each cycle, then productivity is maximized, but material is wasted when defects are found
Solution Approach 1:
The invention introduces dynamic adjustment to the molding process based on real-time quality determination results. The controller modifies the injection process dynamically by preventing injection to specific cavities in subsequent cycles based on defect detection in the current cycle. This dynamic control allows the system to maintain high productivity through continuous operation while reducing material waste through adaptive process modification.
Solution Approach 2:
The system implements feedback control where quality determination results from each cycle feed back into the control decisions for subsequent cycles. The controller uses information about which cavities produced defective parts to adjust the injection process in the next cycle, preventing material waste in affected cavities while maintaining productivity in unaffected cavities.
3Productivity
If quality determination is performed immediately after molding, then manufacturing efficiency is enhanced, but complex control is required to manage good and defective parts
Solution Approach 1:
The system employs self-service quality determination where the detection unit automatically identifies defective parts and the controller automatically generates appropriate control decisions without requiring complex external intervention. The quality determination process is integrated into the existing molding cycle, allowing the system to self-regulate and adjust injection processes based on real-time quality feedback, thereby maintaining efficiency while managing complexity through automated internal control.
Data Source
AI summary
An injection molding system is equipped with a mold having a plurality of cavities, an injection device for injecting a molding material, and a controller for controlling the injection device to mold a plurality of molded parts. The controller includes a determining unit for determining quality of the plurality of molded parts molded at the plurality of cavities. Further, the controller includes a control unit for failure for preventing, when a molded part is judged to be defective, injection to a cavity used for the molded part judged to be good.