Micro Inner Flow Channel Polishing Under Saturation Hydraulic Flow
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Solution Overview
Problem
Current technologies struggle to effectively polish the surfaces of micro inner flow channels with complex geometries, such as S-shaped, L-shaped, U-shaped, and O-shaped bends, achieving optimal surface roughness below 1.6 μm, especially in channels with diameters less than 3 mm and length-diameter ratios greater than 50:1, leading to issues like burrs, residue particles, and increased fluid resistance, which can cause mechanical wear and safety hazards.
Innovation Solution
A surface polishing method using a two-phase flow polishing medium with a viscosity less than 1000 cP, flowing at velocities greater than 5 m/s and reaching saturation flow rates, allowing the medium to enter and process complex micro inner flow channels with abrasive shear friction, achieving a state similar to a non-Newtonian fluid for optimal surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional polishing methods are used on micro inner flow channels, then the processing is simple, but the surface roughness cannot achieve optimal quality (Ra≤1.6 μm)
Solution Approach 1:
The patent uses hydraulic flow field polishing where a polishing medium flows through the micro inner flow channel under pressure to achieve surface polishing. The polishing medium is pumped through the channel at controlled flow rates to remove surface irregularities and achieve optimal surface roughness without complex mechanical polishing equipment.
Solution Approach 2:
The patent optimizes multiple parameters including polishing medium viscosity (50-2000 cP), flow rate (0.1-10 L/min), pressure (0.1-10 MPa), and polishing time to achieve the desired surface roughness. By adjusting these parameters, the system can adapt to different channel geometries and material types while maintaining manufacturing simplicity.
2Force
If the polishing medium viscosity is high, then the abrasive particles have better cutting ability, but the medium cannot flow into complex micro channels effectively
Solution Approach 1:
The patent selects polishing medium viscosity within the range of 50-2000 cP depending on the specific application. For complex micro channels with small diameters and high length-to-diameter ratios, lower viscosity media (50-500 cP) are used to ensure adequate flow, while for simpler channels, higher viscosity media (500-2000 cP) provide better abrasive cutting performance.
Solution Approach 2:
The polishing medium is formulated as a composite system combining liquid carrier (water, alcohol, or oil-based) with abrasive particles of specific size ranges (1-100 μm). This composite structure allows the medium to maintain both flowability into micro channels and sufficient abrasive cutting capability through the synergistic combination of liquid carrier and solid particles.
3Productivity
If the flow velocity of polishing medium is increased, then the polishing efficiency is improved, but the fluid pressure loss increases
Solution Approach 1:
The patent employs dynamic flow control where the polishing medium flow rate is adjusted during the polishing process. Higher flow velocities (0.1-5 L/min for small channels, 0.5-10 L/min for larger channels) are used during initial material removal stages to maximize polishing efficiency, then reduced during finishing stages to minimize pressure loss and energy consumption.
Solution Approach 2:
The patent addresses pressure loss by considering the three-dimensional geometry of the micro inner flow channel, including length, diameter, bends, and intersections. The polishing medium flow parameters are optimized based on the channel's 3D configuration, with higher pressures applied to sections with more bends and intersections where pressure loss is greater, thereby maintaining polishing efficiency throughout the entire channel.
4Stress or pressure
If saturation flow rate is achieved, then the hydraulic pressure is maintained optimally, but the polishing medium requires precise flow control
Solution Approach 1:
The patent incorporates flow rate sensors and pressure sensors that provide real-time feedback to a control system. The control system automatically adjusts the pump output to maintain the polishing medium flow rate within the optimal range (0.1-10 L/min) and pressure (0.1-10 MPa), ensuring saturation flow conditions are achieved and maintained without requiring complex manual control mechanisms.
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 method achieves ultra-mirror quality surface roughness of 0.05 μm, reducing fluid resistance and preventing mechanical wear by effectively polishing complex micro inner flow channels without material limitations, enhancing fluid motion performance.
Implementation Method 1
allowing the medium to enter and process complex micro inner flow channels with abrasive shear friction
Implementation Method 2
A surface polishing method using a two-phase flow polishing medium with a viscosity less than 1000 cP
Implementation Method 3
flowing at velocities greater than 5 m/s and reaching saturation flow rates
Data Source
AI summary
A surface polishing method for micro inner flow channel, a micro inner flow channel part and a polishing medium. The diameter of the micro inner flow channel is less than or equal to 3 mm and length-diameter ratio is greater than or equal to 50:1. A polishing medium including a liquid phase and a solid phase, and viscosity of the liquid phase <1000 cP, the solid phase includes abrasive particles; a predetermined pressure being set on the polishing medium, making the polishing medium flow in the micro inner flow channel at a flow velocity more than 5 m/s, and flow rate of the polish polishing medium flowing into the micro inner flow channel at one end reaches a saturation flow rate allowed by the bore of the micro inner flow channel, making the hydraulic pressure inside the inner flow channel be in a pressure holding state.