Induction Ignition for Explosive Forming Dies
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for explosive forming, such as those using gas mixtures and mercury fulminate, are not suitable for mass production due to difficulties in achieving precise and repeatable ignition with short setup times, and they struggle to withstand high loads during the explosion process.
Innovation Solution
The method employs induction-based ignition to control the explosive process precisely, allowing for time-repeatable and accurate ignition, with the ability to adjust ignition sites and timing to optimize forming results, using induction elements cooled to prevent overheating and integrated into the die for compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional ignition methods (mercury fulminate, heating wire) are used, then the explosive can be ignited, but precise and repeatable ignition control is difficult to achieve
Solution Approach 1:
The patent replaces traditional mechanical/chemical ignition systems (mercury fulminate, heating wires) with an electromagnetic induction system. A coil generates a magnetic field that induces eddy currents in a copper plate, which rapidly heats and ignites the explosive. This substitution enables precise control of ignition timing and location through electrical parameters, achieving both high precision and repeatability required for mass production.
2Strength
If the die is designed to withstand high explosion loads, then the explosion can be contained, but setup time increases
Solution Approach 1:
The die is segmented into modular components: a reusable base die and exchangeable inserts containing the copper plate and explosive. After each forming cycle, the insert can be quickly removed and replaced with a fresh one, while the base die remains in place. This segmentation allows the robust base die to withstand multiple high-load explosions without frequent replacement, while only the consumable inserts need changing, significantly reducing setup time.
3Measurement precision
If induction elements are used for precise ignition control, then ignition accuracy improves, but heat development causes overheating issues
Solution Approach 1:
The copper plate is extracted as a separate, disposable component from the induction element assembly. The coil and copper plate are separated into distinct functional elements where the coil generates the magnetic field and the copper plate absorbs the energy to ignite the explosive. The copper plate, being consumable, can be replaced after each use, allowing the induction coil to be cooled and reused without risk of cumulative overheating, thus maintaining ignition precision while managing temperature.
4Device complexity
If single-site ignition is used, then the ignition mechanism is simple, but forming result predictability is limited
Solution Approach 1:
The system transitions from static single-site ignition to dynamic multi-site ignition control. Multiple copper plates can be positioned at different locations within the die, and their ignition can be controlled sequentially or simultaneously by adjusting the timing of electrical pulses to their respective coils. This dynamic control capability allows optimization of the detonation pattern to achieve predictable and repeatable forming results for complex geometries, while the basic ignition mechanism remains relatively simple.
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 approach enables precise control over the explosive process, improving predictability and reproduction accuracy, reducing cycle times, and increasing efficiency by allowing simultaneous or time-offset ignition at multiple sites, thus enhancing the forming process for mass production.
Implementation Method 1
Ignition by means of induction takes place in a site arranged in the wall of the die or in the bottom area of the explosion chamber
Implementation Method 2
an induction element can be cooled at least temporarily. Because of this, heat development in the induction element and therefore the ignition can be controlled more precisely
Data Source
AI summary
With the invention, a method and device for explosive forming of work pieces, in which at least one work piece is arranged in at least one die and deformed by means of an explosive to be ignited, is to be improved, in that an ignition mechanism that is technically simple to handle, is produced with the shortest possible setup time, which permits the most precise possible ignition of the explosive with time-repeatable accuracy. This task is solved by a method and device, in which at least one work piece is arranged in at least one die and deformed by means of an explosive to be ignited, in which the explosive is ignited by means of induction.