Abrasive Jet Piercing via Gas Diffusion
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Solution Overview
Problem
Abrasive jet systems face challenges in piercing composite and brittle materials due to hydrostatic pressure, which can cause delamination or cracking, and conventional techniques like low pressure piercing and vacuum assist devices have limitations in mitigating damage.
Innovation Solution
The abrasive jet system incorporates a pressurized gas supply that diffuses or disperses the abrasive jet, allowing for reduced hydrostatic pressure and enhanced abrasive entrainment, with a controller managing gas pressure to maintain equal pressures upstream and downstream of the abrasive outlet, and a method that adjusts pressure to achieve a uniform cross-sectional dimension of the abrasive jet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high pressure is used for abrasive jet piercing, then penetration capability is improved, but hydrostatic pressure causes material damage such as delamination or cracking
Solution Approach 1:
A vacuum assist device is activated before the abrasive jet reaches the workpiece to create a vacuum field that draws abrasives into the mixing chamber in advance. This preliminary action ensures that the jet is fully abrasive-laden before impacting the material, preventing water-only jet damage and reducing hydrostatic pressure effects during the critical piercing moment.
Solution Approach 2:
The vacuum assist device acts as an intermediary mechanism between the abrasive supply and the mixing chamber. It mediates the abrasive delivery process by creating a pressure differential that ensures proper abrasive entrainment and timing, allowing the system to achieve effective piercing with reduced material damage.
2Power
If conventional abrasive jet is used for piercing, then cutting power is maintained, but hydrostatic pressure builds up in the cavity causing composite delamination or brittle material cracking
Solution Approach 1:
The system dynamically adjusts the abrasive delivery timing by using a vacuum assist device that activates only during the piercing phase. This dynamic control allows the system to optimize abrasive entrainment precisely when needed, maintaining cutting power during piercing while preventing hydrostatic pressure buildup that would compromise material integrity.
Solution Approach 2:
The vacuum assist device changes the pressure parameters in the mixing chamber by creating a vacuum condition before water injection. This parameter change ensures that abrasives are fully entrained and the jet composition is optimized before impact, maintaining cutting power while reducing the harmful effects of hydrostatic pressure on material integrity.
3Object-affected harmful factors
If low pressure piercing is used, then material damage is reduced, but piercing efficiency and penetration speed decrease
Solution Approach 1:
The vacuum assist device uses pneumatic principles to create a pressure differential that actively draws abrasives into the mixing chamber. This pneumatic assistance compensates for the lower water pressure by enhancing abrasive entrainment through vacuum suction, allowing efficient piercing at reduced pressures without sacrificing productivity.
Solution Approach 2:
The system changes the pressure parameters by introducing a vacuum field in the mixing chamber, which alters the abrasive delivery mechanism. This parameter change enables effective abrasive entrainment at lower water pressures, maintaining piercing efficiency while reducing material damage associated with high pressure.
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 reduces piercing damage to composite and brittle materials by dispersing the abrasive jet, allowing for effective initial penetration and cutting with minimized material damage, while maintaining a consistent abrasive flow.
Implementation Method 1
The pressurized gas is configured to selectively diffuse or disperse the abrasive jet
Implementation Method 2
Abrasives are generally drawn into the abrasive water jet by air flow resulting from a low pressure (vacuum) generated by the Venturi effect of pressurized water flowing through the abrasive cutting head
Data Source
Figure 1A
Figure 1B
Figure 1C~1D
AI summary
Various embodiments of abrasive jet cutting systems are disclosed herein. In one embodiment, an abrasive jet system includes a cutting head configured to receive abrasives and pressurized fluid to form an abrasive jet. The system also includes an abrasive source configured to store abrasives that are supplied to the cutting head, as well as a fluid source configured to store fluid that is supplied to the cutting head. The system further includes a gas source configured to store pressurized gas that is selectively supplied to the cutting head. When supplied to the cutting head, the pressurized gas can advantageously affect, such as by at least partially diffusing, the abrasive jet.