Assist Gas Flow Calculation Using Nozzle-Workpiece Gap
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Solution Overview
Problem
Current methods for calculating the flow rate of assist gas in laser processing lack a specific calculation method and formula that considers the gap value between the nozzle and the workpiece, limiting accurate control of the flow rate.
Innovation Solution
A device and method that utilize a control unit and storage unit to calculate the assist gas flow rate using a linear function with pressure as a variable and a function for determining the slope based on the gap value, allowing for precise calculation of the flow rate by substituting measured pressure and gap data into these functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional flow rate control methods are used based on predetermined high workability regions, then flow rate control is simplified, but calculation accuracy is insufficient because gap value is not properly considered
Solution Approach 1:
The patent applies parameter changes by introducing the gap value as a variable parameter in the flow rate calculation. The calculation formula Q = C × (P^n / G^m) incorporates gap (G) as a critical parameter, allowing the flow rate to be dynamically adjusted based on actual gap conditions. This resolves the contradiction by improving accuracy through parameter consideration without requiring complex predetermined region mappings.
Solution Approach 2:
The patent replaces the conventional mechanical approach of predetermined high workability region tables with a mathematical calculation system. Instead of relying on pre-determined P-S plane regions, the invention uses a calculation formula that dynamically computes flow rate based on pressure and gap parameters, substituting the mechanical table-lookup method with a mathematical model that provides continuous and accurate results.
2Adaptability or versatility
If flow rate is controlled based on predetermined high workability regions in P-S plane, then control process is simplified, but adaptability to different gap values is poor
Solution Approach 1:
The patent applies dynamics by making the flow rate calculation adaptive to changing gap conditions. The formula Q = C × (P^n / G^m) allows real-time adjustment of flow rate based on actual gap measurements, enabling the system to dynamically adapt to different working conditions without requiring manual reconfiguration or complex control procedures.
Solution Approach 2:
The calculation formula provides universal applicability across different gap values and processing conditions. A single formula structure Q = C × (P^n / G^m) can handle various gap scenarios without requiring separate predetermined regions for each gap value, making the system versatile while maintaining operational simplicity through unified calculation.
Data Source
AI summary
Storage units 60, 70 store a first computer program calculating a flow rate of an assist gas with a linear function having a pressure of the assist gas in a processing head 35 as a variable, and a second computer program calculating a slope of the linear function with a function having a gap G from a tip end of a nozzle 36 to a surface of a workpiece W as a variable. A control unit 50 substitutes a value of the gap G into the function to calculate the slope of the linear function and substitutes the slope of the linear function and a value of the pressure of the assist gas into the linear function to calculate the flow rate of the assist gas.