Molding Machine Tie Bar Position Detection for Burr Monitoring
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Solution Overview
Problem
Conventional molding machines struggle to detect burrs and foreign matter with high precision due to limitations in tie bar position detection and clamping systems, leading to incomplete detection and potential mold damage.
Innovation Solution
A molding machine with a clamping system that includes multiple tie bars, position sensors, and pressure sensors to detect displacement and pressure changes, allowing for precise detection of burrs and foreign matter by monitoring the positions of tie bar drive pistons and pressures within predetermined ranges, and a control system to prevent injection when foreign matter is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single position detection point is used for the moving mold plate, then the detection system is simple, but foreign matter cannot be detected over a wide range of the mold mating surfaces
Solution Approach 1:
The patent divides the detection system into multiple independent position detectors, each monitoring a specific tie bar position. This segmentation allows comprehensive detection across the entire mold mating surface while keeping each individual detector simple and manageable.
2Stability of the object's composition
If tie bars are completely fixed to the fixed mold plate, then the clamping system is stable, but only the part corresponding to the thickness of the burr can be detected
Solution Approach 1:
The patent transitions from detecting only at the end of the tie bar (one-point detection) to detecting at multiple positions along the tie bar length (multi-point detection). This dimensional expansion enables comprehensive burr thickness measurement across the entire tie bar span while maintaining system stability.
3Productivity
If one edge side of the mating surface contacts earlier due to mechanical error, then the mold closing process is efficient, but foreign matter at non-contacting edge sides cannot be detected
Solution Approach 1:
The patent segments the mold mating surface into multiple monitoring zones, each with its own position detector. This allows independent detection at each zone regardless of contact timing, ensuring foreign matter is detected even when edge sides contact at different times due to mechanical errors.
4Measurement precision
If high precision components are used for the detector, then burr detection precision is improved, but the system cost and complexity increase
Solution Approach 1:
The patent combines multiple standard position detectors into a coordinated detection system. By merging the detection data from multiple simple detectors and processing it collectively, the system achieves high precision burr detection without requiring any single detector to be overly complex or expensive.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-precision detection of burrs and foreign matter across the entire mold surface, preventing mold damage and ensuring accurate clamping and injection processes.
Implementation Method 1
position sensors detecting positions of the plurality of tie bar drive pistons
Implementation Method 2
pressure sensors detecting the pressures of the cylinder chambers
Implementation Method 3
a plurality of clamping cylinders provided at the other of the fixed mold plate and the moving mold plate and having cylinder chambers accommodating the plurality of tie bar drive pistons
Data Source
AI summary
A molding machine able to detect a burr or other abnormality by detecting the position of tie bars. A control device detects an occurrence of burrs according to whether or not displacement amounts of pistons associated with the tie bars, using position sensors which detect the position of the pistons. The position sensors detect position from the start of injection to the completion of the injection to determine whether detected values are within a permissible range.