Conical Booster Charge Design for Detonation Front Stability
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Solution Overview
Problem
Traditional booster charges with different diameters suffer from edge effects and density variations, leading to disturbances in the detonation front and impaired explosive action.
Innovation Solution
A conically configured booster charge with a cylindrical part and a conical part of varying diameters, where the secondary explosive is loaded using a hydraulic press to achieve a gradual density increase, ensuring the detonator is positioned near the cylindrical part with an air gap, and the pressing process maintains specific density ranges to minimize edge effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional booster charges are divided into sections of different diameters, then the explosive action can be adapted to different applications, but edge effects occur at diametrical transitions leading to impaired explosive action
Solution Approach 1:
The booster charge is divided into functional sections (cylindrical part and conical part) with different diameters, where each section serves a specific purpose. The cylindrical part provides stable detonation while the conical part directs the explosive energy, maintaining both adaptability and reliability through purposeful segmentation rather than arbitrary division.
Solution Approach 2:
The booster charge employs an asymmetric conical configuration instead of symmetric cylindrical sections. The conical shape with varying diameter eliminates the abrupt diametrical transitions that cause edge effects, while still providing adaptability through the gradual geometry change from base to apex.
2Adaptability or versatility
If booster charges have sections of different diameters, then application versatility is improved, but density variations occur between sections leading to disturbances in the detonation front
Solution Approach 1:
The booster charge implements local quality by having different density characteristics in different sections. The cylindrical part maintains lower density (≤80% theoretical) for ease of initiation, while the conical part achieves higher density (≥95% theoretical) for maximum energy output. This localized density optimization eliminates detonation front disturbances while maintaining application versatility.
Solution Approach 2:
The invention changes the density parameter along the length of the booster charge, creating a gradient from the cylindrical to the conical section. This parameter change is achieved through controlled pressing during manufacturing, where pressing time and force are adapted to achieve the desired density distribution, eliminating detonation disturbances.
3Manufacturing precision
If multiple pressing operations are used to load the secondary explosive, then density control is improved, but production complexity and time increase
Solution Approach 1:
The manufacturing process uses periodic pressing operations with specific timing and force parameters. By optimizing the pressing cycle (duration and force application), the process achieves the required density gradient in fewer cycles, balancing density control precision with production efficiency.
Solution Approach 2:
The pressing operation is designed to continuously build up the density gradient in a single integrated process rather than through multiple discrete pressing steps. The hydraulic press applies controlled force continuously during loading, maintaining optimal density development throughout the entire loading process, thereby improving productivity while preserving manufacturing precision.
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 conical configuration reduces disturbances in the detonation front, expands application scope, allows for simpler production with fewer pressings, and optimizes explosive energy usage, reducing the amount of explosive needed and costs.
Implementation Method 1
the secondary explosive of the booster charge is loaded in the booster casing via a pressing process in a hydraulic press, wherein the pressing time and pressing force of the hydraulic press is adapted such that the density for the secondary explosive of the booster charge does not exceed 80% of the theoretical density of the explosive in the cylindrical part of the booster casing, fall below 95% of the theoretical density of the explosive in the conical part of the booster casing
Implementation Method 2
The initiating device comprises at least one detonator and at least one booster charge, for initiating an action charge
Data Source
Figure 1
Figure 2
AI summary
The present invention relates to an initiating device (9), comprising at least one detonator (10) and at least one booster charge (11), wherein the booster charge (11) is arranged such that, in the initiation of an action charge (3), it is free from edge effects which can have a disturbing effect on the action charge (3). Characteristic of the invention is that the booster charge (11) is disposed in a booster casing configured with a rear cylindrical part (13) having the diameter D1, and a front conical part (14) delimited by a first circular limit face (16) having the diameter Di and a second circular limit face (15) having the diameter D2, wherein the two limit faces (16, 15) are plane-parallel at the distance H: from each other and wherein H1/D2 lies within the range 0.5-1.5. The present invention also relates to a production method for the said booster charge (11).