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Interfacial Heterogeneous Microstructure and Subsequent Machinability of 316L/CuSn10 Bimetallic Structure Manufactured by Laser Powder Bed Fusion

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Additive Manufacturing Frontiers 2024年第3期3卷 100-112页

作者： Jie Chen Zhongpeng Zheng Di Wang Guijun Bi Yuchao Bai Institute of Intelligent Manufacturing Guangdong Academy of SciencesGuangzhou510070China Guangdong Key Laboratory of Modern Control Technology Guangzhou510070China State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing100084China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510640China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen518052China

Additively manufactured bimetallic structures combine the advantages of dissimilar materials and can achieve localized properties through a customized composition ***,additively manufactured parts may still lack the dimensional accuracy and surface integrity essential for precision mechanical assemblies that the post-machining process can ***,this study aims to systematically investigate the microstructure and machinability of 316L/CuSn10 bimetallic structures fabricated using laser powder bed *** results show that the fusion zone of the bimetallic structure had refined grains of microscale size owing to the mixture of the primary elements of the bimetals,which resulted in the highest microhardness of 3.4 *** difference in microstructure and microhardness between the single-material and fusion zones also causes significant differences in the cutting response during the ultraprecision *** 316L stainless steel side exhibited the highest cutting force and more severe material accumulation in the *** cutting force drops when cutting through the fusion zone,with an observable fracture in the chips and separation of dissimilar materials on the machined grooves,indicating that the heterogeneous properties of additively manufactured 316L/CuSn10 bimetallic structures pose challenges to the improvement of surface *** simulation results also showed that stress accumulation occurred in the tool path through the fusion zone owing to the higher yield strength and hardness of stainless steel,indicating that lower cutting speeds and depths of cut are favorable for reducing cutting force and improving surface *** study provides deep insight into the microstructure evolution mechanism and a theoretical basis for improving the surface quality of additively manufactured bimetallic structures using an ultraprecision machining process.

关键词： Laser powder bed fusion Bimetallic structure Heterogeneous microstructures Ultra-precision machining Machinability

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4m: Mixstyle-Based Multi-Scale Mlp-Mixer for Mechanical Fault Diagnosis Under Variable Working Conditions

SSRN

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SSRN 2023年

作者： Luo, Gan Zhang, Lei Qi, Hongtuo Yang, Zhile Wu, Zhou School of Civil Engineering Chongqing University Chongqing400045 China Key Laboratory of Metallurgical Equipment and Control Technology Wuhan University of Science and Technology Wuhan430081 China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Institute for Smart City of Chongqing University in Liyang Chongqing University Liyang Jiangsu213300 China Shenzhen Institute of Advanced Integration Technology Chinese Academy of Sciences Guangdong Shenzhen518060 China School of Automation Chongqing University Chongqing400045 China

Intelligent diagnosis is a critical technology in modern manufacturing. Most existing methods tend to use convolutional neural network (CNN) for fault diagnosis (FD) under constant operating conditions. However, the architecture of CNN is limited, resulting in poor global perception ability and high inductive bias. Variable bearing operating conditions will cause a shift in data distribution. To address these issues, this study proposes a MixStyle-based Multi-scale MLP-Mixer (4M) method that expands the statistical features of MixStyle-based data. MixStyle improves the generalization of the samples fed into the neural network and allows it to improve domain invariance learning even further. The multi-scale MLP-mixer based approach can effectively learn the multi-scale feature patterns and global information in the time-frequency (TF) image samples. The experimental results indicate that the proposed method has better diagnostic effects as well as stronger robustness and generalization abilities. © 2023, The Authors. All rights reserved.

关键词： Failure analysis

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A MVS based automatic 3D model reconstruction system from turntable image sequence

A MVS based automatic 3D model reconstruction system from tu...

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International Conference on Information and automation (ICIA)

作者： Xiaojun Wu Dong Zhou Peizhi Wen Control and Modern Automation Equipment Shenzhen Key Laboratory for Advanced Motion Shenzhen Guangdong School of Mechanical Engineering and Automation Shenzhen Graduate School Shenzhen Guangdong School of Computer and Information Security Guilin University of Electronic Technology Guilin Guangxi

ISBN: (纸本)9781509041039

Traditionally, multi-view stereo (MVS) based 3D reconstruction needs a lot of manual interactions, such as camera calibration, silhouette extraction, texture synthesis, etc. To overcome this disadvantage, we present an automatic 3D reconstruction method based on image sequence. First, we design a new checkerboard with included angle 120°. The camera parameters and the rotational axis can be calibrated simultaneously. Then, an automatic silhouette extraction method is presented based on super pixel and cellular automata, from which the color image sequence can be segmented into binary images. Next, we use MVS based 3D reconstruction method to obtain 3D mesh model with camera parameters, color images and silhouettes. Finally, by using the 3D model, projection matrix and color images, we can synthesize the texture map. A prototype is developed based on Canon SDK and a controller. This system can help user to acquire 3D models without professional knowledge. Experimental results with variety of objects demonstrate the effectiveness of our system.

关键词： Three-dimensional displays Cameras Calibration Solid modeling Image segmentation Image reconstruction automation

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High accurate 3D reconstruction method using binocular stereo based on multiple constraints

High accurate 3D reconstruction method using binocular stere...

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IEEE International Conference on Robotics and Biomimetics, IEEE-ROBIO 2015

作者： Xiaojun, Wu Shenghua, Xiao Jingyang, Wei Shenzhen Key Laboratory for Advanced Motion Control and Modern Automation Equipment Shenzhen518055 China Shenzhen Graduate School Harbin Institute of Technology Shenzhen518055 China

ISBN: (纸本)9781467396745

In order to make an improvement of accuracy, completeness and robustness of the image based 3D reconstruction algorithm, we present a stereo matching approach under the condition of multi-resolution combined with multi-constraints to compute the 3D model of an object in this paper. In the first step, we build the image pyramid and stereo matching happens from the top level to the lowest level. In each level, we execute the following procedures: NCC matching, multi-constraints checking, re-matching and weighted median filter, disparity refinement. At last, we acquire an accurate and smooth disparity map in the bottom level. Combine with the calibration parameters, we can compute the 3D point cloud and use the Possion reconstruction method to generate the mesh model. The contributions of this paper are the proposal of choosing the pixel in the eight-neighborhood which has the highest match cost to guide the matching of center pixel during re-match, and design an anisotropic smoothing kernel to smooth the depth map and keep the detail at the same time in the disparity refinement. Experimental results show that the algorithm has the advantages of high precision, strong robustness and good model integrity. © 2015 IEEE.

关键词： Pixels

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Real-time visual hull computation based on GPU

Real-time visual hull computation based on GPU

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IEEE International Conference on Robotics and Biomimetics, IEEE-ROBIO 2015

作者： Dafeng, Gong Xiaojun, Wu Shenzhen Graduate School Harbin Institute of Technology Shenzhen518055 China Shenzhen Key Laboratory for Advanced Motion Control and Modern Automation Equipment Shenzhen518055 China

ISBN: (纸本)9781467396745

A real time visual hull parallel computation method is proposed based on GPU. Firstly, an effective Octree data structure is built on GPU, which establishes the correspondence between voxels and the thread ID of CUDA. Secondly, for large-scale parallel data in the projection test of visual hull calculation, the convex hull of the projected vertices is accelerated to use the GPU programmable features. Finally, the redundant edge computation in marching cubes algorithm is reduced by building the edge lookup table. Then, parallel streaming data reduction based on prefix-sum excludes empty voxels from the lookup table, which can improve the computation effectively. Experimental results show that, for large-scale data, accurate visual hull can be efficiently reconstructed by the proposed algorithm on a common PC and GPU platform. © 2015 IEEE.

关键词： Graphics processing unit

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The design and simulation of the ultrasonic machining driver based on BUCK DC chopper

The design and simulation of the ultrasonic machining driver...

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IEEE International Conference on Robotics and Biomimetics

作者： Jianjun Wang Zhili Long Yang Zhao Harbin Institute of Technology Shenzhen Graduate School and the Shenzhen Key Lab for Advanced Motion Control and Modem Automation Equipment's Shenzhen China Key Laboratory of Mechanical Equipment Manufacturing and Control Technology(Guangdong University of Technology) Ministry of Education Guangzhou China

ISBN: (纸本)9781479973989

For the current problems of resent ultrasonic machining driver, for example, output power is single and power regulation is not precise. This paper presents a new type of ultrasonic machining driver based on BUCK DC chopper. The new type of ultrasonic machining driver consists of STM32F106, DDS waveform generating circuit, signal processing circuit and the most important circuit which is BUCK DC chopper circuit. Principle of the power regulation, transmission's efficiency, the working principle and operating characteristic under current continuous mode of BUCK DC chopper circuit are established in this paper. The parameters related to BUCK DC chopper circuit are calculated. The system of ultrasonic machining driver is simulated by Matlab and related experiments of the driver were carried out. The experiments results show that the driver of new type based on DC chopper can achieved the expect function.

关键词： Choppers (circuits) Acoustics Machining Inverters Power generation Power amplifiers Inductors

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Position/force switching control based on velocity damping

Position/force switching control based on velocity damping

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2013 IEEE International Conference on Information and automation, ICIA 2013

作者： Long, Zhili Fang, Jiwen Zhao, Jiping Chao, Zhu Shenzhen Graduate School Harbin Institute of Technology Shenzhen 518055 China Shenzhen Key Lab for Advanced Motion Control Technology and Modern Automation Equipment Shenzhen 518055 China State Key Lab for Manufacturing Systems Engineering Xi'An Jiaotong University Shenzhen 710049 China Dongguan Huazhong University of Science Technology Manufacturing Engineering Institute Dongguan 523808 China

ISBN: (纸本)9781479913343

Stable and fast switching between displacement and pressure will directly affect precision and velocity of automated equipment. Switching control between displacement and pressure, which is based on the velocity damping, is proposed for motion switching of automated equipment. At first, the control models were established by analyzing displacement control and pressure control. To solve the shortage of direct switching between displacement and pressure, switching control based on the velocity damping is presented. The effectiveness of this method is verified by using piezoelectric sensor in experiment. Compared to direct switching control, the proposed switching control becomes more accurate and faster. The measurement data shows that the maximal impact force of control system is 0.4N and the amplitude of forces of fluctuations are within the range of ±0.03N. © 2013 IEEE.

关键词： control systems

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Position/force switching control based on velocity damping

Position/force switching control based on velocity damping

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International Conference on Information and automation (ICIA)

作者： Zhili Long Jiwen Fang Jiping Zhao Zhu Chao Shenzhen Key Lab for Advanced Motion Control Technology & Modern Automation Equipment Shenzhen State Key Lab for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an Shenzhen Graduate School Harbin Institute of Technology Shenzhen Shenzhen Graduate School Harbin Institute of Technology 518055 China

ISBN: (纸本)9781479913329

关键词： Switches Damping Force Welding Pressure control Process control

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