Thermoforming Machine Stroke Position Control
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Solution Overview
Problem
Thermoforming machines experience increased mechanical and electrical component stress due to high loads and shocks during the punching and punching-out processes, leading to suboptimal production conditions and frequent maintenance needs, as the tool's adjustment and machine setup often result in inadequate cutting force and excessive impacts.
Innovation Solution
Implementing a method that measures maximum load magnitudes on the machine during punching and punching-out, adjusting the stroke position to maintain a predetermined ratio of load variables, allowing for automatic optimization of the thermoforming process without operator intervention, using sensors to monitor accelerations, distances, and tensions, and adjusting the punching depth based on thermal stability and production cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tool punches out more items per stroke to increase productivity, then the production output increases, but the load on the machine and tool increases causing excessive shocks and stress
Solution Approach 1:
The patent implements dynamic adjustment of the punching depth based on real-time measurement of load variables. The control system continuously monitors forces, accelerations, or pressures and automatically adapts the punching parameters during operation, transforming a static process into a dynamic one that optimizes both productivity and machine reliability
Solution Approach 2:
The patent employs a feedback mechanism where sensor means measure load variables (forces, accelerations, pressures) during punching operations, and the control system uses this information to automatically adjust punching depth and speed. This closed-loop control prevents excessive shocks while maintaining high production rates
2Object-affected harmful factors
If the cutting edge is made sharper and tool quality improved to reduce shocks, then the punching process becomes smoother, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces purely mechanical solutions (sharper cutting edges, higher tool quality) with a sensor-based measurement and control system. Instead of relying on mechanical precision alone, the system uses electronic sensors and automated control to monitor and adjust punching parameters, reducing shocks through intelligent control rather than mechanical refinement
Solution Approach 2:
The patent changes the punching process parameters (depth, speed, timing) dynamically based on measured load variables. By adjusting these parameters in real-time, the system optimizes the punching process to minimize shocks without requiring increased tool quality or complexity
3Manufacturing precision
If manual adjustment of machine setup is performed to optimize cutting force, then the punching process can be optimized, but the operator intervention time and production downtime increase
Solution Approach 1:
The patent implements a self-adjusting system where the machine automatically optimizes its own punching parameters based on sensor feedback. The control system monitors load variables and autonomously adjusts punching depth and speed without requiring operator intervention, enabling the machine to self-optimize during production runs
Solution Approach 2:
The patent uses continuous feedback from sensor means to automatically adjust punching parameters. The control system receives real-time data on forces, accelerations, or pressures and autonomously modifies the punching process to maintain optimal cutting force, eliminating the need for manual setup adjustments
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
This method significantly increases machine availability, reduces unplanned maintenance, and ensures optimal production conditions by automatically adjusting the kissing depth, minimizing shock loads and maintaining the correct cutting force, thus enhancing the operational reliability and efficiency of the thermoforming machine.
Implementation Method 1
Measurement of a maximum load magnitude acting on the thermoforming machine, which acts on the thermoforming machine, in particular on a part of the thermoforming machine, during punching
Implementation Method 2
the film web is punched over part of its thickness without completely severing the film web, and when the article is punched out, the film thickness still remaining after the punching is cut through
Data Source
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AI summary
The method involves measuring a maximum loading parameter, which acts on a part of a thermoforming machine (1) during pressing on the thermoforming machine. Another maximum loading parameter is measured, where the latter loading parameter acts on the part of the thermoforming machine during die cutting on the thermoforming machine. A stroke position of a movable tool part (2) of a tool is changed still a ratio of the measured maximum loading parameters reaches a predetermined value or lies in a predetermined region, where the parameters are accelerations, paths or voltages. : An independent claim is also included for a thermoforming machine for forming articles made of plastic. USE : Method for operating a thermoforming machine (claimed) for forming plastic articles e.g. margarine bowls, drinking cups and container lids. ADVANTAGE : The stroke position of the movable tool part of the tool is changed still the ratio of the measured maximum loading parameters reaches the predetermined value or lies in the predetermined region, thus maintaining an optimal relationship between pressing of foils and die cutting of the foils, and hence providing a value from automatic adjustment so as to enable effective operation and manufacturing process of the thermoforming machine, without activities of a machine operator. The thermoforming machine is operated with reduced repair-and maintenance works, thus ensuring improved correct operation of the thermoforming machine. DESCRIPTION OF DRAWINGS : The drawing shows a schematic view of a thermoforming machine with an opened tool. 1 : Thermoforming machine 2 : Movable tool part 3 : Fixed tool part 4 : Plastic foil web 5 : Sensor unit.