Magneto-Pneumatic Percussion Mechanism Impact Detection
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Solution Overview
Problem
Existing machine tools for chiseling tools lack precision in detecting the impact event, particularly when the die is not in its home position, leading to inconsistent performance and reduced tolerance for the actual position of the die during operation.
Innovation Solution
A magneto-pneumatic percussion mechanism with a primary drive using magnetic coils and an air spring, where a regulated current source detects changes in current flow to identify the impact event, allowing for precise control of the acceleration phase and adaptation to the induced voltage, enabling consistent operation regardless of the die's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional percussion mechanism is used without precise impact detection, then the device complexity is reduced, but the measurement precision of the impact event deteriorates
Solution Approach 1:
The patent replaces complex mechanical impact detection mechanisms with an electromagnetic sensing system. The magnetic coil detects impact events through changes in induced voltage and current flow characteristics, eliminating the need for mechanical sensors or switches while achieving precise detection of the impact moment between the beater and die.
Solution Approach 2:
The control system continuously monitors the current flow through the magnetic coil and uses this feedback to detect impact events. When the dielectric material (or the die itself) enters the magnetic field during impact, it causes a characteristic change in the current waveform, which the controller uses to precisely determine the impact moment and adjust the acceleration phase accordingly.
2Manufacturing precision
If the die position is not precisely controlled, then the ease of operation is improved, but the manufacturing precision of the chiseling process deteriorates
Solution Approach 1:
The control system performs preliminary detection of the die's position within the magnetic field before the impact occurs. By monitoring the current flow characteristics as the die approaches the impact position, the system can anticipate the impact moment and adjust the acceleration phase in advance, ensuring precise chiseling positioning even when the die is not exactly at the home position.
Solution Approach 2:
The patent changes the detection parameter from requiring precise mechanical position sensing to monitoring electrical current characteristics. By detecting changes in current flow through the magnetic coil caused by the die's presence and movement, the system can determine impact timing and adjust control parameters dynamically, achieving high manufacturing precision with greater operational tolerance.
3Reliability
If the acceleration phase is extended to ensure consistent performance, then the reliability is improved, but the loss of time increases
Solution Approach 1:
The patent implements dynamic adjustment of the acceleration phase duration based on real-time detection of the die's position and impact readiness. The control system continuously monitors current flow characteristics and adapts the acceleration timing to match the actual state of the system, ensuring consistent performance while minimizing unnecessary acceleration time when the die is already in the optimal position.
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
The solution provides a high tolerance for the die's position, ensuring consistent and precise operation by accurately detecting the impact event and adapting the voltage to maintain efficient energy transfer, resulting in improved performance and reliability.
Implementation Method 1
a magnetic coil arranged around the movement axis, preferably a first magnetic coil and a second magnetic coil in succession in the direction of impact... The hammer mechanism has a hammer and a hammer on the axis of movement within the magnetic coils
Implementation Method 2
The moving racquet induces a voltage in the magnetic coil which opposes the current supplied by the power source. The power source compensates for this by increasing the voltage it applies to the solenoid
Implementation Method 3
the hammer mechanism can have an air spring acting on the hammer in the direction of impact
Data Source
AI summary
The method involves controlling a current from power source. The controlled current is fed into magnetic coils (46,47) at target value during an acceleration phase. The acceleration phase is terminated when change of current flowing in magnetic coil or change of control variable of a control circuit of the power source is consistent with stored pattern for the change at an impact of striker (4) on anvil. An independent claim is included for a machine tool.