Rationality optimization of tool path spacing based on dwell time calculation algorithm

2015 ◽  
Vol 84 (9-12) ◽  
pp. 2055-2065 ◽  
Author(s):  
Ri Pan ◽  
Yajun Zhang ◽  
Jianbiao Ding ◽  
Cong Cao ◽  
Zhenzhong Wang ◽  
...  
Keyword(s):  
Dwell Time ◽  
Tool Path ◽  
Calculation Algorithm ◽  
Time Calculation

scholarly journals Ultraprecision Real-Time Displacements Calculation Algorithm for the Grating Interferometer System

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2409 ◽  
Author(s):  
Weinan Ye ◽  
Ming Zhang ◽  
Yu Zhu ◽  
Leijie Wang ◽  
Jinchun Hu ◽  
...  
Keyword(s):  
Real Time ◽  
Affine Transformation ◽  
Degrees Of Freedom ◽  
Diffraction Spot ◽  
Calculation Algorithm ◽  
Six Degrees Of Freedom ◽  
Time Calculation ◽  
Interference Signals ◽  
Grating Interferometer ◽  
Optical Paths

Grating interferometry is an environmentally stable displacement measurement technique that has significant potential for identifying the position of the wafer stage. A fast and precise algorithm is required for real-time calculation of six degrees-of-freedom (DOF) displacement using phase shifts of interference signals. Based on affine transformation, we analyze diffraction spot displacement and changes in the internal and external effective optical paths of the grating interferometer caused by the displacement of the wafer stage (DOWS); then, we establish a phase shift-DOWS model. To solve the DOWS in real time, we present a polynomial approximation algorithm that uses the frequency domain characteristics of nonlinearities to achieve model reduction. The presented algorithm is verified by experiment and ZEMAX simulation.

Modeling and Identification of Feed Drive Kinematics and Cycle Time Calculation

Manufacturing ◽  
2003 ◽  
Author(s):  
Wencai Wang ◽  
Derek M. Yip-Hoi
Keyword(s):  
Machine Tool ◽  
Cycle Time ◽  
Manufacturing Systems ◽  
Kinematic Model ◽  
Cnc Machine ◽  
Machining Processes ◽  
Calculation Algorithm ◽  
Motion Data ◽  
Feed Drive ◽  
Time Calculation

Cycle time calculation plays a major role in the design of manufacturing systems. Accurate estimates are needed to correctly determine the capacity of a line in terms of the number of machines that must be purchased. Over estimation results in excess capacity and under estimation leads to unsatisfied demand. Due to the high automation and cutting speeds of modern machining processes, cycle time calculation must consider both the timing of various machining actions and the kinematics of feed motions. This paper presents a cycle time calculation algorithm that gives accurate cycle time results by considering the effects of jerk and acceleration of the machine tool drives. The kinematic model for axis motion is based on trapezoidal acceleration profiles along the toolpaths. Based on this model, an algorithm for identifying the kinematic parameters has been developed. This algorithm has the advantage of utilizing a minimal set of axis motion data thus reducing the amount of data that must be collected from experiments by the machine tool vendor or the machine tool’s enduser. The proposed cycle time calculation algorithm has been verified in machining a V6 cylinder head on a four axis CNC machine.

Polyline Dwell Time Algorithm for Every Type of Tool Path for Ultrasonic-Magnetorheological Combined Finishing

2010 ◽  
Vol 126-128 ◽  
pp. 435-440
Author(s):  
Fei Hu Zhang ◽  
Xing Bin Yu ◽  
Yong Zhang ◽  
Yong Yong Lin
Keyword(s):  
Dwell Time ◽  
Tool Path ◽  
Time Algorithm ◽  
Mean Value ◽  
Curvature Radius ◽  
Aspheric Surfaces ◽  
Planning Algorithm ◽  
Material Removal Model ◽  
A New Technique ◽  
Path Planning Algorithm

Ultrasonic- magnetorheological combined finishing (UMC) is a new technique for the ultraprecision machining of aspheric surfaces, especially for high quality workpieces with small curvature radius concave surfaces. According to the characteristics of UMC finishing, material removal model has been developed. Several types of tool path planning algorithm have been discussed. Two kinds of polyline dwell time algorithm are presented. Polyline Dwell time algorithm based on two-dimensional discrete convolution is a new dwell time algorithm, and the dwell time on the endpoints which compose the tool path can be solved by the algorithm directly. Every polyline dwell time is the mean value of dwell time of two endpoints, therefore, the polyline dwell time of every type of tool path can be solved efficiently by the algorithm. The simulation of two dwell time algorithms has been conducted with same removal function and original error distribution, and the pv convergence rate is improved from 0.939 to 0.973 by using new algorithm. Figure error PV values reduced to 29.4 nm from 1.67μm after UMC finishing. The efficiency of the polyline dwell algorithm is proved by computer simulation and experimental results.

Dwell time calculation for computer controlled large tool

2012 ◽  
Author(s):  
Bin Fan ◽  
James H. Burge ◽  
Hubert Martin ◽  
Zhige Zeng ◽  
Xiaojin Li ◽  
...  
Keyword(s):  
Dwell Time ◽  
Time Calculation ◽  
Computer Controlled

An Automatic Cost Calculation System for 3-D Laser Cutting Based on Characteristic Numbers

2005 ◽  
Vol 6-8 ◽  
pp. 825-0
Author(s):  
M. Masur ◽  
F. Liébana ◽  
U. Stute
Keyword(s):  
Laser Cutting ◽  
Cost Calculation ◽  
Calculation Algorithm ◽  
Machining Time ◽  
Characteristic Numbers ◽  
Plausibility Check ◽  
Time Calculation ◽  
Cutting Velocity ◽  
Calculation System ◽  
The Cost

At present, small and medium-sized enterprises (SME) in the sheet metal industry performing 3-d laser cutting have to invest a considerable amount of time in offer preparation, although there is a low probability of obtaining the order. The offer calculation is mostly done manually and rapidly, as estimation. For example, the length of the contours to be cut are extracted from drawings and summed up. The actual production time for problem areas of the workpiece geometry like sharp angles and narrow radii can only be calculated by a post-processor simulation, or by a comparison with a similar workpiece that was manufactured before. This complicates the cost calculation and adds an unknown factor to it. Therefore, only experienced employees can estimate the costs for the cutting of 3-d workpieces. The aim of the proposed automatic cost calculation algorithm is the quick machining time calculation for 3-d laser cutting. Less experienced persons should be able to use a pre-configured tool. Characteristic numbers are generated on the basis of the workpiece geometry. They describe all necessary machine work that is required to manufacture the current workpiece. In a next step, the dynamic machine behaviour for these problem areas needs to be examined. It is projected to specific machine parameters. As example the acceleration and the maximum cutting velocity are basic parameters. By connecting the characteristic numbers with the machine parameters, the machining time for a specific machine is calculated. This machining time is an important factor for the cost calculation. The characteristic numbers can also be used to find similar workpieces within a database. This database contains existing and already evaluated offers. As a plausibility check the user can search for similar offers and compare them with the currently prepared one.

Shaping Minimum Strain Energy Curves for FF-TLOM

2003 ◽  
Author(s):  
J. J. Broek ◽  
A. Kooijman ◽  
A. de Smit ◽  
I. Horva´th
Keyword(s):  
Strain Energy ◽  
Tool Path ◽  
Computing Time ◽  
Free Form ◽  
Energy Curve ◽  
Calculation Algorithm ◽  
Path Creation ◽  
Blade Shape ◽  
Minimum Strain Energy ◽  
A Chain

Free Form Thick Layered Object Manufacturing (FF-TLOM) technology is based on foam cutting with a curved heated flexible cutting blade. Three single parameters shape the flexible blade. An infinite amount of blade shapes can be selected. However, many of these shapes are not suitable for cutting. Blade shapes with less than two inflexions can be applied successfully. When two inflexions are involved the blade; more than one different stable blade shape can be realized. For tool path creation and cutting procedures the blade shape must be known. A 2-D calculation algorithm based on (Kallay, 1987) is used. The calculation result is a minimum strain energy curve of a prescribed length, which is represented by a chain of segments. The shape is unfolded by rotating each segment under conditions of total energy decrease until no improvements are achieved. In this paper the process parameters are analyzed for sensitivity and influence on the accuracy and conditions of the blade shaping process. An overview of these parameters is given and the accuracy, computing time and trustworthiness of the implemented algorithm is checked. Typical FF-TLOM process characteristics are considered for its influence on the blade shape The elastic energy of curves is presented for a complete range of blade shapes. Regions of bi-stable blade shapes are perceived based on more than one blade inflexion. Finally a selection is presented for those minimum strain curves, which are applicable for the FF-TLOM technology.

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