A Feedrate Scheduling Strategy Based on a General Force Model

2009 ◽  
Vol 407-408 ◽  
pp. 509-515
Author(s):  
Yu Jun Cai ◽  
Chun Zheng Duan ◽  
Li Jie Sun
Keyword(s):  
Process Planning ◽  
Cycle Time ◽  
Tool Path ◽  
Cnc Machining ◽  
Force Model ◽  
Cutting Force Model ◽  
Surface Machining ◽  
Individual Constant ◽  
General Force ◽  
Critical Process

Sculpture surface machining is a critical process commonly used in die/mold industries. Since there is a lack of scientific tools in practical process planning stages, feedrates for CNC machining are set individual constant values all along the toolpath. In this paper, an enhanced mathematical cutting force model is presented and is used for selecting varying and ‘appropriate’ feed values along the tool path in order to decrease the cycle time in sculpture surface machining. The model is tested under various machining conditions and proved to be effective.

Manufacturability Analysis for a Flexible Manufacturing Cell

1989 ◽  
Author(s):  
M. Anjanappa ◽  
M. J. Courtright ◽  
D. K. Anand ◽  
J. A. Kirk
Keyword(s):  
Data Base ◽  
Process Planning ◽  
Cycle Time ◽  
Flexible Manufacturing ◽  
Cnc Machining ◽  
Design For Manufacturability ◽  
Flexible Manufacturing Cell ◽  
Manufacturing Cell ◽  
Machining Center ◽  
Cnc Machining Center

Abstract The conventional design to manufacture cycle time in producing a part can be reduced by eliminating design errors and difficult to machine features before process planning begins. This paper discusses the identification, development and operation of an approach which uses a data base of flexible manufacturing cell capabilities in order to analyze a design for manufacturability. Designs which the cell protocol is unable to produce are rejected, and ways in which a design may be made more producible are suggested to the user. This paper addresses issues, such as material availability, tool availability and the acheivability of tolerance, as they relate to the flexible manufacturing cell which contains a Matsuura 510V CNC machining center, a robot and simulated AGV and fixturing. An important contribution of this work, which is an integral part of the overall system protocol, is the wide variety of manufacturability constraints covered and the convenience of including it in the overall part design and process planning protocol.

A Novel Automatic Feedrate Adjustment Method for Die-Cavity Roughing

2005 ◽  
Vol 291-292 ◽  
pp. 625-630
Author(s):  
Min Jie Wang ◽  
Y.J. Cai ◽  
W.G. Yan
Keyword(s):  
High Speed ◽  
Tool Path ◽  
Orthogonal Cutting ◽  
Cnc Machining ◽  
Surface Model ◽  
Machining Time ◽  
Surface Machining ◽  
Cutter Deflection ◽  
Sculptured Surface Machining ◽  
Volumetric Models

Sculptured surface machining is a critical process commonly used in die and mold industries. Since there is a lack of scientific tools in practical process planning stages, feedrates of CNC machining are selected based on previous experiences. In the selection of feedrate, the feedrate is set an individual conservative constant value all along the die cavity roughing processes in order to avoid undesirable results such as chipping, cutter breakage or over-cut due to excessive cutter deflection. Usually, volumetric models or vector force models used for optimizaton of feedrates must be created to get the variable feedrates along the tool path. Considering the die cavity roughing being a 2.5D cutting, a novel cutting force surface model is created based on orthogonal cutting tests to adjust the feedrates. The model is tested by a typical die-cavity roughing, thinning down machining time and balanced cutting-load can be attained. The presented feedrate scheduling characterized by balancing the cutting-loads in die-cavity roughing will be more significative in high speed machining.

An Improved Tool Path Model Including Gyroscopic Effect for Instantaneous Cutting Force Prediction in High-Speed Milling

2011 ◽  
Vol 418-420 ◽  
pp. 840-843
Author(s):  
Qing Hua Song ◽  
Xing Ai
Keyword(s):  
Cutting Force ◽  
High Speed ◽  
Tool Path ◽  
Milling Process ◽  
Path Model ◽  
Force Model ◽  
Cutting Force Model ◽  
Gyroscopic Effect ◽  
Cutting Force Prediction ◽  
High Speed Milling

The efficiency of the high-speed milling process is often limited by the occurrence of chatter. In order to predict the occurrence of chatter, accurate models are necessary. With the speed increasing, gyroscopic effect plays an important pole on the system behavior, including dynamic characteristic and rotating behavior. Considering the influence of gyroscopic effect on rotating behavior, an updated model for the milling process is presented which features as model of the equivalent profile of tool. In combination with this model, a nonlinear instantaneous cutting force model is proposed. The use of this updated equivalent profile of tool results in significant differences in the static uncut thickness compared to the traditional model.

A Neural Network Based Process Planning System to Infer Tool Path Pattern for Complicated Surface Machining

2019 ◽  
Vol 13 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Mayu Hashimoto ◽  
◽  
Keiichi Nakamoto
Keyword(s):  
Neural Network ◽  
Process Planning ◽  
Tool Path ◽  
Low Cost ◽  
Planning System ◽  
Surface Machining ◽  
Process Planning System ◽  
Generalize Process ◽  
Die And Mold ◽  
Complicated Surface

Die and mold are necessary for the manufacture of present industrial products. In recent years, the requirement of high quality and low cost machining of complicated surfaces has increased. However, it is difficult to generalize process planning that depends on skillful experts and decreases the efficiency of preparation in die and mold machining. To overcome an issue that is difficult to generalize, it is well known that neural networks may have the ability to infer a valid value based on past case data. Therefore, this study aims at developing a neural network based process planning system to infer the required process parameters for complicated surface machining by using past machining information. The result of the conducted case studies demonstrates that the developed process planning system is helpful for determining the tool path pattern for complicated surface machining according to the implicit machining knowhow.

An Improved Tool Path Model Including Periodic Delay for Chatter Prediction in Milling

2006 ◽  
Vol 2 (2) ◽  
pp. 167-179 ◽  
Author(s):  
R. P. H. Faassen ◽  
N. van de Wouw ◽  
H. Nijmeijer ◽  
J. A. J. Oosterling
Keyword(s):  
Periodic Solution ◽  
Cutting Force ◽  
Tool Path ◽  
Chip Thickness ◽  
Milling Process ◽  
Path Model ◽  
Force Model ◽  
Cutting Force Model ◽  
Periodic Delay ◽  
The Stability

The efficiency of the high-speed milling process is often limited by the occurrence of chatter. In order to predict the occurrence of chatter, accurate models are necessary. In most models regarding milling, the cutter is assumed to follow a circular tooth path. However, the real tool path is trochoidal in the ideal case, i.e., without vibrations of the tool. Therefore, models using a circular tool path lead to errors, especially when the cutting angle is close to 0 or π radians. An updated model for the milling process is presented which features a model of the undeformed chip thickness and a time-periodic delay. In combination with this tool path model, a nonlinear cutting force model is used, to include the dependency of the chatter boundary on the feed rate. The stability of the milling system, and hence the occurrence of chatter, is investigated using both the traditional and the trochoidal model by means of the semi-discretization method. Due to the combination of this updated tool path model with a nonlinear cutting force model, the periodic solution of this system, representing a chatter-free process, needs to be computed before the stability can be investigated. This periodic solution is computed using a finite difference method for delay-differential equations. Especially for low immersion cuts, the stability lobes diagram (SLD) using the updated model shows significant differences compared to the SLD using the traditional model. Also the use of the nonlinear cutting force model results in significant differences in the SLD compared to the linear cutting force model.

Adaptive spiral tool path generation for computer numerical control machining using point cloud

2021 ◽  
pp. 095440622199007
Author(s):  
Mandeep Dhanda ◽  
Aman Kukreja ◽  
SS Pande
Keyword(s):  
Tool Path ◽  
Cnc Machining ◽  
Numerical Control ◽  
Numerical Control Machining ◽  
Form Errors ◽  
Spiral Tool Path ◽  
Novel Method ◽  
Mesh Grid ◽  
Cloud Of Points ◽  
Cam Software

This paper reports a novel method to generate adaptive spiral tool path for the CNC machining of complex sculptured surface represented in the form of cloud of points without the need for surface fitting. The algorithm initially uses uniform 2 D circular mesh-grid to compute the cutter location (CL) points by applying the tool inverse offset method (IOM). These CL points are refined adaptively till the surface form errors converge below the prescribed tolerance limits in both circumferential and radial directions. They are further refined to eliminate the redundancy in machining and generate optimum region wise tool path to minimize the tool lifts. The NC part programs generated by our algorithm were widely tested for different case studies using the commercial CNC simulator as well as by the actual machining trial. Finally, a comparative study was done between our developed system and the commercial CAM software. The results showed that our system is more efficient and robust in terms of the obtained surface quality, productivity, and memory requirement.

3D Cutting Force Model of a Stinger PDC Cutter: Considering Confining Pressure and the Thermal Stress

2021 ◽  
Author(s):  
Chao Xiong ◽  
Zhongwei Huang ◽  
Huaizhong Shi ◽  
Ruiyue Yang ◽  
Xianwei Dai ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Cutting Force ◽  
Confining Pressure ◽  
Force Model ◽  
Cutting Force Model
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