A process quality control method based on online finite element simulation
A process quality and control method technology, applied in the field of machinery industry, can solve the problems that the detection method cannot be monitored, and the processing process cannot be simulated in real time, so as to achieve the effect of reducing time and assisting the control process
Active Publication Date: 2020-08-14
BEIHANG UNIV
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Therefore, the finite element method can only be used as an offline calculation method, and cannot perform online real-time simulation of the processing process. For some physical quantities, such as residual stress, it will have a greater impact on the use of the workpiece, which cannot be monitored using traditional detection methods. To get the results, it is necessary to use the method of simulation to evaluate
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[0032]The invention provides a process control method based on online finite element simulation, which controls the quality of the process of processing the tank-shaped shell by using the spinning process. It is known that the processing of the aluminum alloy shell is a multi-pass heating and strong spinning process, so that the shell is gradually deformed. The workpiece heating process is controlled manually and mainly depends on experience. Due to the large size of the shell, it is difficult to achieve a uniform temperature distribution of the workpiece during processing, and the temperature determines the fluidity of the metal, the metal deformation ability and The uneven fluidity eventually leads to abnormal deformation of the material such as: thinning, bulging and other defects, which leads to a high reject rate of the product. At the same time, if there is a large residual stress in the processed finished product, the storage And during use, with the release of residual...
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The invention discloses an online finite element simulation-based process quality control method. According to the method, characteristic parameters in a processing process are collected, historical simulation data are retrieved, so that the real-time simulation of the processing process can be realized; and a producer can adjust and control the process parameters of a next procedure according toa simulation result. With the method of the invention adopted, the quality characteristics of products processed by a plurality of procedures can be quantitatively evaluated; the numerical values of physical quantities that are difficult to measure by traditional measurement methods can be obtained under corresponding processing conditions; after quantitative analysis is performed according to thespecific numerical values, a more accurate and specific processing process modification program can be obtained; and data are retrieved from the database of workpiece processing results under different processing conditions on the basis of processing states monitored in an actual processing process, so as to assist simulation, and therefore, time required by simulation can be greatly reduced, processing results are assessed, and control on technique processes can be assisted.
Description
technical field [0001] The invention relates to the technical field of machinery industry, and more specifically relates to a process quality control method based on online finite element simulation. Background technique [0002] Finite element simulation uses mathematical approximation to simulate real physical systems. Also by using simple and interacting elements, namely units, a finite number of unknowns can be used to approximate a real system with infinite unknowns. Finite element analysis is to replace complex problems with simpler problems and then solve them. It regards the solution domain as composed of many small interconnected sub-domains called finite elements, assumes a suitable approximate solution for each unit, and then deduces the total satisfaction conditions of this domain to obtain the solution of the problem. This solution is not exact but approximate because the actual problem is replaced by a simpler one. Since most practical problems are difficult...
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IPC IPC(8): G05B17/02
CPCG05B17/02
Inventor 戴伟张钰清
Owner BEIHANG UNIV