Key Technologies of Embedded Gear Machining CNC System

2013 ◽  
Author(s):  
Jiang Han ◽  
Xiao-qing Tian ◽  
Lian Xia ◽  
Fu-gen Li ◽  
Jie Cheng ◽  
...  
Keyword(s):  
Tracking Error ◽  
Mathematic Model ◽  
Numerical Control ◽  
Machining Process ◽  
Programming Algorithm ◽  
Contour Error ◽  
Programming System ◽  
Automatic Programming ◽  
Database Technology ◽  
Process Database

A reconfigurable gear machining numerical control system (NC/CNC) architecture is proposed in this paper. The CNC platform can be quickly applied to gear hobbing, shaping, milling and grinding machine, through simple reconfiguring or parameter setting. Parametric automatic programming technology, high speed and high precision electronic gearbox, process database technology are studied. Based on the analysis of the gear machining process, the mathematic model on automatic programming of gear machining is established. Based on the Windows CE operating system, the CNC gear machining automatic programming system is developed on the ARM+DSP hardware platform, including the design of human-machine interface, automatic programming algorithm and other modules. With the support of the automatic programming and process database modules, NC codes can be generated automatically just by inputting gear parameters, tool parameters and process parameters, then, the interpolation data structure can be generated by interpreter module. A new kind of software electronic gearbox (EGB) and its implementation methods are also researched in the embedded CNC. Data flow among the modules is analyzed. Finally, experiments are conducted, and the tracking error and contour error are analyzed. The results show that the proposed gear machining CNC architecture is effective.

Coupled Motion Control and Adjustment in Automatic Programming System of CNC Hobbing Machines

2011 ◽  
Vol 86 ◽  
pp. 552-555
Author(s):  
Qiang Li ◽  
Li Li Yi ◽  
Shi Long Wang ◽  
Jie Zhou
Keyword(s):  
Motion Control ◽  
Machining Process ◽  
Programming System ◽  
Automatic Programming ◽  
Processing Efficiency ◽  
Coupled Motion ◽  
Coupling Relationship ◽  
Adjustment Time ◽  
Gear Hobbing ◽  
Relationship Model

The motion relationship model of all axes involved in CNC hobbing machines is established. A single pitch adjustment method based on motion coupling relationship in gear hobbing is proposed. With position adjustment of only 0 to 1 pitch, the same motion coupling relationship during the whole machining process can be guaranteed. Though automatic programming system based on SINUMERIK 840D, the coupled motion control and adjustment in CNC hobbing process is realized. And practical application in CNC hobbing machines shows that this method can reduced adjustment time effectively during process, improving processing efficiency.

scholarly journals Digital twin control of multi-axis wood CNC machining center based on LinuxCNC

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 1115-1130
Author(s):  
Aleksandar Rakic ◽  
Sasa Zivanovic ◽  
Zoran Dimic ◽  
Mladen Knezevic
Keyword(s):  
Control System ◽  
Virtual Machines ◽  
Computer Numerical Control ◽  
Cnc Machining ◽  
Numerical Control ◽  
Machining Process ◽  
Programming System ◽  
Digital Twin ◽  
Machining Center ◽  
Computer Aided

This paper presents an application of an open architecture control system implemented on a multi-axis wood computer numerical control milling machining center, as a digital twin control. The development of the digital twin control system was motivated by research and educational requirements, especially in the field of configuring a new control system by “virtual commissioning”, enabling the validation of the developed controls, program verification, and analysis of the machining process and monitoring. The considered wood computer numerical control (CNC) machining system is supported by an equivalent virtual machine in a computer-aided design and computer-aided manufacturing (CAD/CAM) environment, as well as in the control system, as a digital twin. The configured virtual machines are used for the verification of the machining program and programming system via machining simulation, which is extremely important in multi-axis machining. Several test wood workpieces were machined to validate the effectiveness of the developed control system based on LinuxCNC.

scholarly journals A Novel Position Domain Controller For Contour Tracking Performance Improvement

2021 ◽  
Author(s):  
Truong Dam
Keyword(s):  
Time Domain ◽  
Phase Error ◽  
Common Factor ◽  
Tracking Error ◽  
Numerical Control ◽  
Tracking Performance ◽  
Contour Error ◽  
Contour Tracking ◽  
Cnc Machine ◽  
Equivalent Time

A common problem with modern manufacturing processes that utilize high feed-rate machining is how to accurately track a given contour for the tool center point (TCP) of a system. Various methods have been developed to increase axial tracking performance and contouring performance of computerized numerical control (CNC) machines. These include: high gain feedback controllers, feedforward controllers, zero phase error tracking controllers (ZPETC), cross-coupled control (CCC), and iterative learning control to mention a few. The common factor amongst these methods is that they are all based in time domain. This thesis will propose a new control law based in position domain applied to contour tracking control of a CNC machine. The goal of this developed controller is to improve the overall tracking and contouring performance of a CNC system. The idea behind a position domain control involves transforming the dynamics of a system from time domain into position domain through a one-to-one mapping. In the position domain system control, the motion of one of the axis is used as an independent reference by sampling equidistantly to control the remaining axes according to the contouring requirements. The overall contour error in a position domain controller should be lower relative to an equivalent time domain controller since there will be a zero tracking error from the reference motion. The stability of the proposed position domain control is proven through the Lyapunov method. Simulations with linear and nonlinear TCP contours using the proposed position domain controller and an equivalent time domain controller indicate that the proposed position domain control can improve tracking and contouring performance. In addition, a position domain controller with cross-coupled control was also proposed to further improve contour performance.

The System Development on Automatic Programming of Numerical Control Lathe Based on AutoCAD

2013 ◽  
Vol 273 ◽  
pp. 574-578 ◽  
Author(s):  
Nian Yuan Zhan ◽  
Xiang Qiang Xie
Keyword(s):  
Design Method ◽  
System Development ◽  
Processing System ◽  
System Optimization ◽  
Automatic Generation ◽  
Numerical Control ◽  
Code Design ◽  
Programming System ◽  
Automatic Programming ◽  
Nc Code

This paper put forward a kind of computer aided programming of CNC lathe model design method, this model based on the characteristics of various components lathe design. Therefore, through to the automatic programming system studies the key techniques a artificial intelligence research and development under the environment of quick and precise nc code technology. Among them, including graphics collection system, mould processing system, system optimization and NC code automatic generation, and a series of automatic coding process. Through the study of the workpiece geometry turn program, combined with the hybrid system module design features and characteristics identification provide CAD code design program.

Design and Realization of Helical Rotor NC Automatic Programming System

2012 ◽  
Vol 605-607 ◽  
pp. 1469-1473
Author(s):  
Feng Chen ◽  
Liang Yao Gu ◽  
Yue Yang ◽  
Chun Yang Jia
Keyword(s):  
Design Method ◽  
Numerical Control ◽  
Programming System ◽  
Automatic Programming ◽  
Geometrical Properties ◽  
Object Oriented Design ◽  
High Efficient ◽  
Nc Machine ◽  
Rotor Surface ◽  
Migration Method

Helical rotor is a core component of helical-lobe compressor. Analysis was made on the geometrical properties of tooth curves. Using standard spherical milling cutter on 4-axis NC machine, normal migration method was used to rotor surface processing. Based on the generation characteristics of helical rotor surface, object-oriented design method is used to achieve automatic programming system of helical rotor. The calculation of helical rotor end face profile lines and cutter location point are realized, and over cutting analysis is carried out to generate high efficient numerical control processing program.

Influence of Nonlinear Friction and Disturbance in the Control of a Mechatronic System: CNC Machine Tool Application

2011 ◽  
Author(s):  
Liz K. Rincon ◽  
Joa˜o M. Rosario
Keyword(s):  
Machine Tool ◽  
Cutting Force ◽  
Viscous Friction ◽  
Numerical Control ◽  
Machining Process ◽  
Contour Error ◽  
Nonlinear Friction ◽  
Cnc Machine ◽  
Mechatronic Systems ◽  
High Speeds

The CNC (Computer Numerical Control) machine tools are complex mechatronic systems applied to the manufacture with high precision and high speeds. To achieve high accuracy and operational efficiency, the disturbance and friction, which occur during machining process, should be reduced as low as possible. This paper develops an analysis of influence by cutting force and friction effect in the control of machine tool based on the CNC dynamic model and parameters identification. For this purpose, the study focuses on Coulomb and Viscous nonlinear friction and the external disturbances. The analysis uses control position error, contour error, and stability to determine the influence of friction and disturbance. The results show that Viscous friction has more critical influence on system than the Cutting force and Coulomb. The work contributes in recognizing which parameters have greater influence on the machine behavior through dynamic analysis with the identification strategy, in order to design and improve the control structure for a real CNC system.

Automatic Programming System for Machining Center On-Line Inspection

2010 ◽  
Vol 139-141 ◽  
pp. 1233-1236
Author(s):  
Jian Jun Meng ◽  
Fen Liu ◽  
Hong Qiang Sang ◽  
Jin Tian Yun
Keyword(s):  
Production Efficiency ◽  
Machining Process ◽  
Quality Analysis ◽  
Secondary Development ◽  
Programming System ◽  
Automatic Programming ◽  
Machining Center ◽  
Object Arx ◽  
On Line ◽  
Tool Damage

Currently, manual inspection and off-line inspection play an important role in the inspection methods of machining process, which severely restricts the development of inspecting automation. In the paper, automatic programming system for machining center on-line inspection was developed by secondary development kit object ARX of AutoCAD. Inspecting datum was obtained, inspecting process planning was laid up and inspecting program was made automatically. The inspection can be applied to automatic workpiece setting up, on-line inspection of workpiece, data processing, quality analysis and compensation of machined workpiece errors, which led to increase precision, production efficiency and quality and reduced the rate of rejection and tool damage.

scholarly journals Contour Error Modeling and Compensation of CNC Machining Based on Deep Learning and Reinforcement Learning

2021 ◽  
Author(s):  
Yakun Jiang ◽  
Jihong Chen ◽  
Huicheng Zhou ◽  
Jianzhong Yang ◽  
Pengcheng Hu ◽  
...  
Keyword(s):  
Deep Learning ◽  
Reinforcement Learning ◽  
Tracking Error ◽  
Cnc Machining ◽  
Numerical Control ◽  
Contour Error ◽  
Error Prediction ◽  
Machining Accuracy ◽  
Good Precision ◽  
Compensation Strategy

Abstract Contour error compensation of the Computer Numerical Control (CNC) machine tool is a vital technology that can improve machining accuracy and quality. To achieve this goal, the tracking error of a feeding axis, which is a dominant issue incurring the contour error, should be firstly modeled and then a proper compensation strategy should be determined. However, building the precise tracking error prediction model is a challenging task because of the nonlinear issues like backlash and friction involved in the feeding axis; besides, the optimal compensation parameter is also difficult to determine because it is sensitive to the machining tool path. In this paper, a set of novel approaches for contour error prediction and compensation is presented based on the technologies of deep learning and reinforcement learning. By utilizing the internal data of the CNC system, the tracking error of the feeding axis is modeled as a Nonlinear Auto-Regressive Long-Short Term Memory (NAR-LSTM) network, considering all the nonlinear issues of the feeding axis. Given the contour error as calculated based on the predicted tracking error of each feeding axis, a compensation strategy is presented with its parameters identified efficiently by a Time-Series Deep Q-Network (TS-DQN) as designed in our work. To validate the feasibility and advantage of the proposed approaches, extensive experiments are conducted, testifying that, our approaches can predict the tracking error and contour error with very good precision (better than about 99% and 90% respectively), and the contour error compensated based on the predicted results and our compensation strategy is significantly reduced (about 70%~85% reduction) with the machining quality improved drastically (machining error reduced about 50%).

Modeling and adaptive compensation of tooth surface contour error for internal gearing power honing

2018 ◽  
Vol 233 (5) ◽  
pp. 1500-1514 ◽  
Author(s):  
Jiang Han ◽  
Yonggang Zhu ◽  
Lian Xia ◽  
Xiaoqing Tian ◽  
Bin Yuan
Keyword(s):  
Machine Tools ◽  
Tracking Error ◽  
Cross Coupling ◽  
Error Modeling ◽  
Numerical Control ◽  
Tooth Surface ◽  
Contour Error ◽  
Adaptive Compensation ◽  
Surface Contour ◽  
Gear Machine

The machining of high precision gears requires a strict and accurate co-movement relationship controlled by the electronic gearbox between the moving axes of the gear machine tools. This article proposes a tooth surface contour error modeling method and an adaptive electronic gearbox cross-coupling controller for internal gearing power honing. First, the electronic gearbox model is structured according to the generative machining principle of internal gearing power honing and the tooth surface contour error is established by means of homogeneous coordinate transformation and meshing principle. Then, the adaptive electronic gearbox cross-coupling controller is designed, which comprises the electronic gearbox cross-coupling controller and the fuzzy proportional–integral–derivative controllers whose universes of membership functions in fuzzy rules are optimized by particle swarm optimization to improve the adaptability and robustness to disturbance fluctuation and model uncertainty of the system. Finally, experiments are carried out on a self-developed gear numerical control system. The results have demonstrated that the estimated tooth surface contour error using the proposed method is very close to the actual one, and the proposed adaptive electronic gearbox cross-coupling controller can effectively reduce the tracking error and the tooth surface contour error when compared to the electronic gearbox cross-coupling controller and non–electronic gearbox cross-coupling controller (electronic gearbox controller without cross-coupling and adaptive compensation).

The Study of Automatic Programming System for Near-Field Electrospinning Direct Write

2011 ◽  
Vol 197-198 ◽  
pp. 3-7 ◽  
Author(s):  
Zhi Min Lin ◽  
Bin Yao ◽  
Jun Jun Ye ◽  
Gao Feng Zheng
Keyword(s):  
Near Field ◽  
Processing Parameters ◽  
Machining Process ◽  
Open Architecture ◽  
Programming System ◽  
Automatic Programming ◽  
Direct Write ◽  
Nano Structure ◽  
Experimental Base ◽  
Open Architecture Cnc

In order to control the machining process of Direct-Write based on Near-field Electrospinning automatically, an automatic programming system used for an open architecture CNC system is proposed in this paper. This system descirbes the machining trajectory via the 2D CAD drawing, from which the data is extracted by the system. According to the processing parameters, the data is classified and reordered, and NC codes are automatically generated. The system solves the problem in integrating the design and machining, makes it more convenient to experimental research and realizes patterned fabrication of micro/nano-structure,which provides a good experimental base for the development of electrospinning technology.

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