RFID Mold Tracking for Faster Injection Molding Changeovers
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Solution Overview
Problem
Existing methods for manufacturing injection-molded parts in injection molding machines require sequential manual steps that lead to significant delays before production can begin, including identifying and installing molds and setting operating parameters, which reduces the efficiency of the production process.
Innovation Solution
A method utilizing RFID transponders on machine tool parts, such as injection molds, to detect their movement and location, enabling automated control signals based on their positions, directions, and speeds, allowing for precise preparation of the production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual inspection methods are used to detect defects, then device complexity is low, but manufacturing precision and defect detection capability deteriorate
Solution Approach 1:
The patent replaces manual mechanical inspection with an automated optical inspection system that uses images captured by a camera to detect defects. The evaluation unit automatically assesses defect presence and severity based on image analysis, eliminating the need for manual visual inspection while improving detection accuracy and consistency.
Solution Approach 2:
The patent introduces an evaluation unit as an intermediary between the image capture device and the control system. This evaluation unit processes images to determine defect presence and severity, serving as a mediator that translates visual information into actionable inspection results without requiring direct human intervention.
2Productivity
If production speed is increased, then productivity improves, but manufacturing precision deteriorates due to insufficient inspection time
Solution Approach 1:
The patent implements continuous inspection throughout the production process by integrating the image capture device and evaluation unit into the production line. Inspection occurs continuously as articles move through the production process, ensuring no defects are missed regardless of production speed variations.
Solution Approach 2:
The patent performs defect inspection early in the production process, before defective articles proceed to subsequent manufacturing steps. This preliminary detection allows for immediate identification and removal of defects, preventing waste of additional resources on faulty products.
3Manufacturing precision
If comprehensive inspection of all articles is performed, then manufacturing precision improves, but loss of time increases
Solution Approach 1:
The patent applies partial inspection by evaluating only critical defect types that significantly impact product quality and safety. The evaluation unit is configured to identify and flag only those defects that require immediate attention, rather than attempting to detect every possible minor imperfection, thus reducing inspection time while maintaining quality standards.
4Manufacturing precision
If automated inspection systems are implemented, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The patent designs the evaluation unit to perform multiple inspection functions using a single integrated system. The same image capture device and evaluation unit can detect various types of defects across different article types, reducing the need for multiple specialized inspection devices and simplifying the overall system architecture.
Data Source
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AI summary
The present invention discloses a method for controlling and/or monitoring a production plant for producing a multiplicity of articles, wherein the production plant has the following: at least one machine tool (10); at least one machine tool part (11, 12) which interacts with the machine tool (10) in order to produce an article; at least one RFID transponder connected to the machine tool part (11, 12); at least two RFID reading devices (20; 20_1, 20_2, 20_3, 20_4) which are arranged at a distance from one another and at a distance from the machine tool (10); and at least one control device which is connected to the RFID reading devices (20; 20_1, 20_2, 20_3, 20_4) via data lines, wherein the method has the following method steps of: - determining a first location of the machine tool part (11, 12) at a first time by means of the first RFID reading device (20; 20_1, 20_2, 20_3, 20_4) and/or by means of the second RFID reading device (20; 20_1, 20_2, 20_3, 20_4); - determining a second location of the machine tool part (11, 12) at a second time, which temporally follows the first time, by means of the first RFID reading device (20; 20_1, 20_2, 20_3, 20_4) and/or by means of the second RFID reading device (20; 20_1, 20_2, 20_3, 20_4); and outputting at least one control signal by means of the control device on the basis of the first location and the second location.