Raw Part Geometry Compensation for Hydroerosive Grinding
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Solution Overview
Problem
Current methods for hydroerosive grinding lack the capability to accurately determine the geometry of a raw part required to produce a finished part within predetermined tolerances, especially for complex shapes and fine structures, leading to issues like fouling and increased pressure loss in components such as 3D-printed metals, ceramics, and plastics.
Innovation Solution
A method involving the creation of a structural model of the finished part, followed by a mathematical simulation of the hydroerosive grinding process to generate an intermediate model, with iterative adjustments to the initial model based on orthogonal distance comparisons to ensure the raw part geometry meets the desired tolerances, using CAD programs and simulation tools like ANSYS for finite element methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the raw part geometry is modified to compensate for material removal, then final geometry tolerance is improved, but the complexity of the production process increases
Solution Approach 1:
The method replaces complex iterative mechanical trial-and-error processes with computational simulation and calculation. Instead of physically producing test parts, measuring them, and manually adjusting the model, the system uses software to simulate hydroerosive grinding, calculate deviations, and automatically generate compensation values for the raw part geometry.
2Manufacturing precision
If conventional polishing methods are used on complex shapes, then surface finish is improved, but the process requires multiple iterations and extensive manual measurement
Solution Approach 1:
The method creates a digital copy (CAD model) of the part and performs virtual polishing simulations on this copy. By working with the digital model instead of physical parts through multiple iterations, the system can rapidly test different polishing parameters and predict outcomes without the time-consuming cycle of physical polishing, measurement, and manual model adjustment.
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 precise determination of the raw part geometry, ensuring the finished part meets the required dimensions and surface smoothness, reducing fouling and pressure loss issues, and enabling high-precision polishing and machining.
Implementation Method 1
a liquid containing grinding particles flows over a surface to be processed. During the flow, the grinding particles contained in the liquid strike the surface of the component to be processed, so that the corresponding surface is erosively ground by the grinding particles eroding material from the component upon impact
Data Source
Figure 1
AI summary
The invention relates to a method for determining the geometry of a raw part, which is shaped to form a finished part in a hydroerosive grinding method, comprising the following steps: (a)creation of a structural model of the finished part to be produced, the structural model of the finished part to be produced being used as an initial model for the first execution of the next step (b); (b)mathematical simulation of the hydroerosive grinding method, with which an intermediate model with a modified geometry is produced starting from an initial model; (c)comparison of the intermediate model produced in step (b) with the structural model of the finished part and determination of the distance, orthogonal to the surface of the structural model of the finished part, between the structural model of the finished part to be produced and the intermediate model at each node of the structural model, and comparison of the orthogonal distance with a predetermined limit value; (d)creation of a modified model of the component by adding from 5 to 99% of the distance determined in step (c) with the opposite sign at each node on the surface of the model which is used as an initial model in step (b), orthogonally to the surface, and repetition of steps (b) to (d), the modified model created in step (d) being used as a new initial model in step (b) if the orthogonal distance determined in step (c) at at least one node is greater than the predetermined limit value; (e)termination of the simulation when the orthogonal distance determined in step (c) between the structural model of the finished part and the intermediate model at each node falls below a predetermined limit value, the initial model of the step (b) carried out last corresponding to the raw part geometry to be determined.