Pre-formed Material Supply for Controlled Explosion Forming
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Solution Overview
Problem
Conventional explosion forming methods face issues with inconsistent material flow and wall thickness due to shock waves, leading to potential cracks and inconstant material expansion, which are not effectively addressed by transitioning to deflagration as a safer alternative fails to provide sufficient forming pressure and speed.
Innovation Solution
The introduction of a pre-formed supply of material that can be deformed during the explosion forming process to achieve desired wall thickness and improved material flow, adaptable to the final shape and position, using methods like forming molding, thermal joining, or additional material deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If explosion forming is used to achieve high forming pressure and speed, then forming efficiency is improved, but material flow becomes inconstant and wall thickness varies
Solution Approach 1:
The invention applies preliminary action by pre-forming a supply of material (such as a pre-formed bulb or material reservoir) on the workpiece before the explosion forming process. This pre-formed material supply is strategically positioned to be engaged by the detonation front, ensuring controlled material flow during the high-speed forming process and preventing wall thickness variations without compromising forming speed.
2Reliability
If deflagration is used instead of detonation to improve process safety, then safety is improved, but forming pressure and speed become insufficient
Solution Approach 1:
The invention maintains the use of detonation for sufficient forming pressure while applying preliminary action through the pre-formed material supply. This allows the high-pressure detonation to be used effectively only where needed (at the pre-formed material supply), improving process safety by reducing the overall explosive charge required while maintaining adequate forming pressure for the workpiece.
Solution Approach 2:
The invention applies local quality by concentrating the material supply and deformation at a specific pre-formed location (the bulb or reservoir) rather than distributing the forming process uniformly. This allows detonation to be applied locally at the pre-formed material supply where high pressure is needed, while other areas experience less severe conditions, effectively balancing safety and forming pressure requirements.
3Speed
If shock wave is used to achieve rapid material deformation, then forming speed is improved, but local tension and cracks occur in the workpiece
Solution Approach 1:
The invention applies preliminary action by pre-forming a material supply (bulb or reservoir) that anticipates the high-speed deformation. This pre-formed structure is designed to be engaged by the detonation front, allowing the shock wave to deform material in a controlled sequence from the pre-formed supply rather than directly impacting the final workpiece geometry, thereby reducing local tension and preventing cracks while maintaining deformation speed.
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 allows for a more regular and controlled deformation process, ensuring a satisfactory wall quality and shape by increasing the material available for deformation, supporting the formation of desired features like cavities and surface improvements.
Implementation Method 1
a detonation is based on a chemical reaction of the explosive(s) and propagates by shock wave induced combustion
Implementation Method 2
Due to the shock wave following the detonation, the workpiece tends to local formation of tension and cracks
Implementation Method 3
This supply of material is deformed by the detonation and can be used to obtain a desired wall thickness in desired portions of the workpiece
Data Source
AI summary
It shall be achieved by the invention that a workpiece for an explosion forming process, which can be inserted into a forming tool and which can be deformed from an initial shape by means of explosion forming, and the explosion forming method are improved such that a satisfactory quality of the workpiece with the desired wall thickness is achieved in a simple manner. This object is achieved by a workpiece and a respective explosion forming method in which the initial shape of the workpiece has at least in some portions a supply of material for the explosion forming process, which is pre-formed compared to adjoining portions or which is provided therewith.