Generalized modeling of milling dynamics for the 4DOF machining system with asymmetric flexibility

2022 ◽  
Vol 169 ◽  
pp. 108750
Author(s):  
Xing Zhang ◽  
Zhao Zhao ◽  
Kunhong Chen ◽  
Wanhua Zhao
Keyword(s):  
Machining System ◽  
Milling Dynamics

Feed direction dependent milling dynamics of an asymmetric flexible machining system

2021 ◽  
pp. 1-13
Author(s):  
Xing Zhang ◽  
Kunhong Chen ◽  
Zengguang Wang ◽  
Wanhua Zhao
Keyword(s):  
High Performance ◽  
Machining Accuracy ◽  
Dynamics Modeling ◽  
Dynamics Model ◽  
Vibration Displacement ◽  
Feed Direction ◽  
Machining System ◽  
General Dynamics ◽  
Dynamics Response ◽  
Milling Dynamics

Abstract Asymmetric flexible machining system has been widely used in NC machining. In traditional milling dynamics model, the cutter feed direction is usually defined as parallel to its vibration DOF, while the nonparallel condition and its induced milling dynamics response are not deeply considered. This paper presents a general dynamics modeling method for asymmetric flexible machining systems. Firstly, to the best of the author's knowledge, a new dimension named feed direction is proposed, which is used to establish the generalized coupling relationship between the vibration displacement and the regenerative milling force, thus improve the applicability of the milling dynamics model and reduce the experimental workload compared with the traditional modeling. Secondly, through the theoretical and experimental research, it is shown that the asymmetric flexible machining system has a significant feed direction dependent characteristics, and implied the existence of high performance machining region with higher stability and low SLE by contrast with the symmetrical milling system and the traditional model. Finally, by controlling the feed direction angle, the milling parameters in roughing and finishing operation are optimized, and the machining efficiency has been greatly improved on the premise of stable cutting and machining accuracy at last.

Usability of Web-Based Design and Manufacturing Systems: Case Study of Micro Machining

2005 ◽  
Author(s):  
Hyung-Jung Kim ◽  
Won-Shik Chu ◽  
Hyuk-Jin Kang ◽  
Sung-Hoon Ahn ◽  
Dong-Soo Kim ◽  
...  
Keyword(s):  
Manufacturing Systems ◽  
Processing Time ◽  
Micro Machining ◽  
User Friendliness ◽  
Web Based ◽  
Design And Manufacturing ◽  
Cad Cam ◽  
Machining System ◽  
Web Based System ◽  
The Web

In this paper, web-based design and manufacturing systems are compared with a commercial CAD/CAM system from the point of usability. The web-based systems included in this study were MIcro Machining System (MIMS) and SmartFab. In the MIMS architecture, a 3D model in STL format was read via a web browser, sent to the web server for toolpath planning, and NC codes were generated to be fed back to the designer through the web connection. In the SmartFab system, SolidWorks was used as the design interface with provided modified menus for micro machining. These additional menus were created by SolidWorks API that also provided web-based links to the toolpath planner. In the commercial CAD/CAM case, without using any web connection, SolidWorks or CATIA was used for design, and PowerMill was used as a CAM tool. For each design and manufacturing system, accessibility, user-friendliness, toolpath-reliability, and processing time were compared. Total 91 students tested these systems in undergraduate CAD class, and the feedback showed better performance of the web-based system in accessibility, user-friendliness, and processing time. However, reliability of the web-based system showed necessity of further improvement.

scholarly journals Implementation of a micro-electrical discharge machining system to fabricate TiO2 nanocolloid

Mechatronics ◽  
2021 ◽  
Vol 79 ◽  
pp. 102649
Author(s):  
Kuo-Hsiung Tseng ◽  
Kuo-Hui Chen ◽  
Chaur-Yang Chang ◽  
Yagus Cahyadi ◽  
Meng-Yun Chung
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Micro Electrical Discharge Machining ◽  
Machining System

Videooptical Surface Shape and Integrity Estimation in Robots Machining

2013 ◽  
Vol 332 ◽  
pp. 270-275 ◽  
Author(s):  
Tadeusz Mikolajczyk
Keyword(s):  
Surface Roughness ◽  
Industrial Robot ◽  
Surface Shape ◽  
Engineering System ◽  
Machined Surface ◽  
Reflectivity Method ◽  
Machining System ◽  
Grinding Tool ◽  
Smart Machining ◽  
Usb Camera

Paper shows system to surface shape and quality control in machining using industrial robot. To surface control videooptical methods were used. Surface shape was controlled using the special reverse engineering system. To surface roughness measure machined surface reflectivity method was used. Used own constructions non contact system was equipped with red laser light and USB camera. Wrist of robot was equipped with grinding tool. In paper shows some algorithms of presented processes. Shown too examples of experiments results in surface roughness measure in start end of grinding process. First trials of presented system shows possibility to build smart machining system for finishing of surface with unknown shape.

Hybrid CO2 Laser/Waterjet Machining of Polycrystalline Diamond Substrate: Material Separation Through Transformation Induced Controlled Fracture

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Dinesh Kalyanasundaram ◽  
Andrea Schmidt ◽  
Pal Molian ◽  
Pranav Shrotriya
Keyword(s):  
Co2 Laser ◽  
Polycrystalline Diamond ◽  
Substrate Material ◽  
Stress Fields ◽  
Separation Mechanism ◽  
Raman Spectrometry ◽  
Waterjet Machining ◽  
Machining System ◽  
Material Separation ◽  
Controlled Fracture

This paper presents a combined experimental and computational investigation of a novel material separation mechanism in polycrystalline diamond (PCD) substrates. A hybrid CO2 laser/waterjet (CO2-LWJ) machining system that combines a CO2 laser for localized heating and an abrasive-free waterjet to rapidly quench the heated area is utilized for cutting experiments on PCD substrates. Scanning electron microscopy (SEM) and micro-Raman spectrometry characterization performed on the cut surfaces show that cut surfaces were divided into two zones—a thin transformed zone near the top where the PCD grains have transformed to graphite and diamond-like carbon; and a fracture zone with the same composition as-received substrate. The experimental results indicate that the PCD substrates were cut through a “score and snap” mechanism—laser heating leads to localized damage and phase transformation of surface layers; and subsequently, stress fields developed due to constrained expansion of transformed material and waterjet quenching act on the laser made “score” to propagate crack through the thickness. Analytical solutions for thermal diffusion and force equilibrium are used to determine the temperature and stress fields in the PCD substrate during CO2-LWJ cutting. Fracture mechanics analysis of crack propagation is performed to demonstrate the feasibility of the “score and snap” mechanism for cutting of PCD substrates.

Development of STEP-NC Based Machining System for Machining Process Information Flow

2013 ◽  
Vol 315 ◽  
pp. 278-282
Author(s):  
Noordiana Kassim ◽  
Yusri Yusof ◽  
Mahmod Abd Hakim Mohamad ◽  
Mohd Najib Janon ◽  
Rafizah Mohd Hanifa
Keyword(s):  
Information Flow ◽  
Machining Process ◽  
Planning System ◽  
Specific Information ◽  
Cad Model ◽  
Machining Feature ◽  
Process Planning System ◽  
Depth Study ◽  
Cad Cam ◽  
Machining System

To realize the STEP-NC based machining system, it is necessary to perform machining feature extraction, generating machine-specific information, and creating a relationship between STEP-NC entities. A process planning system of a STEP-NC information flow that starts with constructing a machining feature from a CAD model will be developed. In this paper, a further in-depth study of the implementation and adaptation of STEP-NC in manufacturing is studied. This study will help to understand how the data from CAD/CAM can be converted into STEP-NC codes and the machining process will be based on the STEP-NC codes generated.

Intelligent laser machining system for multi-function processing of superhard materials

2021 ◽  
Author(s):  
Yong Wang ◽  
Wei Wang ◽  
Dongbin Zhang ◽  
Xiaolin Tian ◽  
Jiaojiao Qu ◽  
...  
Keyword(s):  
Laser Machining ◽  
Superhard Materials ◽  
Machining System

Parallel-Process (Simultaneous) Machining and its Stability

1999 ◽  
Author(s):  
O. Burak Ozdoganlar ◽  
William J. Endres
Keyword(s):  
Initial Conditions ◽  
General System ◽  
Parallel Process ◽  
Analytical Stability ◽  
Multiple Processes ◽  
Or Practice ◽  
Machining System ◽  
Eigenvector Analysis ◽  
The Stability ◽  
Machining Operations

Abstract This paper presents a mathematical perspective, to complement the intuitive or practice-oriented perspective, to classifying machining operations as parallel-process (simultaneous) or single-process in nature. Illustrative scenarios are provided to demonstrate how these two perspectives may lead in different situations to the same or different conclusions regarding process parallelism. A model representation of a general parallel-process machining system is presented, based on which the general parallel-process stability eigenvalue problem is formulated. For a special simplified case of the general system, analytical methods are employed to derive a fully analytical stability solution. Thorough study of this solution through eigenvector analysis sheds light on some fundamental phenomena of parallel-process machining stability, such as dependence of the stability solution on phasing of the initial conditions (disturbances). This establishes the importance, when employing numerical time-domain simulation for such analyses, of specifying initial conditions for the multiple processes to be arbitrarily phased so that correct results are achieved across all spindle speeds.

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