Recently, the University of Nottingham Ningbo, the University of Nottingham, United Kingdom and Kyoto University in Japan published the latest research results entitled "Controlling of Compliant Grinding for Low-rigidity Components" in the International Journal of Machine Tools and Manufacture, which revealed the flexibility The mechanism of the effect of part stiffness on material removal in the grinding process, a time-varying cooperative control method is proposed, which realizes the uniform removal of materials under the condition of dual flexibility of the grinding tool workpiece, on the premise of ensuring the initial geometric profile of low stiffness parts, Increased processing accuracy. The author of this article is Yang Yue, PhD student of the University of Nottingham Ningbo (professor Li Haonan and Dr. Liao Zhirong), and the corresponding author is Professor Dragos Axinte of the University of Nottingham.
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Low-rigidity parts represented by thin-walled structures are widely used in aerospace, biomedicine, electronic technology, and vehicle engineering. Grinding plays an important role as the final processing pass for profile assurance. At present, the use of rigid abrasive tools for processing low-rigidity thin-wall structures and flexible abrasive tools for processing high-rigidity parts and other single flexible bodies has been widely studied. However, there are few studies on the grinding process of double flexible bodies for the grinding of flexible tools with low stiffness parts.
In response to this problem, the research team took the circular flat thin plate (workpiece) and the near hemispherical flexible grinding head (grinding tool) as examples (), and established the workpiece-grinding double flexible body contact for the symmetrical/asymmetric loading of the workpiece () In the deformation model, the relationship between the input grinding tool depression amount-actual grinding tool deformation-workpiece deformation is obtained. The results show that the deformation of low-rigidity workpieces and flexible abrasive tools has time-varying and potential-varying characteristics (), so it will lead to poor consistency of material removal in traditional constant-pressure grinding.
Based on this, this paper proposes a time-varying cooperative depression control strategy to obtain a constant material removal rate. The schematic diagram is shown below.
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In order to verify the effectiveness of this strategy, the research team conducted experiments at different locations and continuous grinding. The experimental results show that during fixed-point grinding (), as the grinding position moves from the center of the workpiece to the edge / the amount of depression increases, the material removal rate gradually increases, the normal grinding force increases, and the actual workpiece-grind contact The area increases. In continuous grinding (), the traditional constant pressing amount will obtain a grinding surface with a high middle edge and a low edge. However, with the time-varying depression calculated by this method, a smooth and close-to-ideal removal surface can be obtained.
Although the above study takes the grinding process as an example, the proposed time-varying cooperative control strategy can be applied as a general control method to other machining processes that include dual flexible bodies, and has certain reference in improving the machining accuracy of low-rigidity parts Value and engineering application prospects.
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