NC Machining of Trimmed Surfaces Maintaining Adjacent-Surfaces Integrity

The NC Teaching Plotter is designed for the practice teaching needs of NC machining, In order to improve current existing practice teaching environment of "many student, less equipment". It explains the NC concept with concise way and demonstrates NC thought by the intuitive operation.In this paper, the design of NC teaching plotter makes interpolation motion between pen and table based on NC program in accordance with the requirement made by user, to draw the graphics by moving the magnet control brush painting through the single chip digital control and the two stepper motor control X, Y two axes feed. The NC teaching plotter which demonstrates more clearly and directly the numerical control idea has high practical value for teaching practice.

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Research on the localisation of the workpieces with large sculptured surfaces in NC machining

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-003-1897-2 ◽

2004 ◽

Vol 23 (5-6) ◽

pp. 429-435 ◽

Cited By ~ 19

Author(s):

Y. Sijie ◽

Z. Yunfei ◽

P. Fangyu ◽

L. Xide

Keyword(s):

Nc Machining ◽

Sculptured Surfaces

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Interference-Free Multi-Axis NC Machining of Cylindrical Cam Using Enveloping Element

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.419-420.333 ◽

2009 ◽

Vol 419-420 ◽

pp. 333-336

Author(s):

Jeng Nan Lee ◽

Chih Wen Luo ◽

Hung Shyong Chen

Keyword(s):

Cutting Tool ◽

Nc Machining ◽

Model Material ◽

Solid Model ◽

End Mill ◽

Generating Method ◽

Collision Problem ◽

Five Axis ◽

Cutting Path ◽

Cutting Simulations

To obtain the flexibility of choice of cutting tool and to compensate the wear of the cutting tool, this paper presents an interference-free toolpath generating method for multi-axis machining of a cylindrical cam. The notion of the proposed method is that the cutting tool is confined within the meshing element and the motion of the cutting tool follows the meshing element so that collision problem can be avoided. Based on the envelope theory, homogeneous coordinate transformation and differential geometry, the cutter location for multi-axis NC machining using cylindrical-end mill is derived and the cutting path sequences with the minimum lead in and lead out are planned. The cutting simulations with solid model are performed to verify the proposed toolpath generation method. It is also verified through the trial cut with model material on a five-axis machine tool.

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Research on S-gear design, manufacturing and measuring based on NC machining center

Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture ◽

10.1177/0954405420981346 ◽

2020 ◽

pp. 095440542098134

Author(s):

Shao-ying Ren ◽

Yan-zhong Wang ◽

Yuan Li

Keyword(s):

Convex Surface ◽

Coordinate Measuring Machine ◽

Nc Machining ◽

Tooth Profile ◽

Numerical Control ◽

Machining Center ◽

Involute Gear ◽

Measuring Machine ◽

Gear Contact ◽

Nc Machining Center

This article presents a method of design, manufacturing, and measuring S-gear. S-gear is a kind of gear whose tooth profile is an S-shaped curve. The sine (cosine) gear, cycloid gear, polynomial gear, and circular arc gear are all S-gears in essence. In the S-gear transmission, the concave surface of one gear and the convex surface of the other gear contact each other. Therefore, the power transmitted by S-gear is much larger than that of the convex-convex-contact involute gear. Some scholars have studied the characteristics of S-gear, but few have explored its manufacturing. In this article, the Numerical Control (NC) machining technology of S-gear is studied in detail for its industrial application. The polynomial curve is used to construct the tooth profile of the S-gear based on the Gear Meshing Theory. The mathematical model of polynomial S-gear is established, by which involute gear can be represented as a special S-gear. The steps of generating NC codes are described. Then, the S-gear sample is processed with an NC machining center. Finally, the sample is measured with a Coordinate Measuring Machine (CMM), and the measurement results show that the accuracy of the S-gear processed by the NC machining center reaches ISO6. This research provides a feasible approach for the design, manufacturing, and measuring of S-gear.

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Four-axis CAM module for NC machining of rotational-free surfaces

Proceedings. 1991 IEEE International Conference on Robotics and Automation ◽

10.1109/robot.1991.131792 ◽

2002 ◽

Cited By ~ 1

Author(s):

Suk-Hwan Suh ◽

Kee-Sang Lee

Keyword(s):

Nc Machining ◽

Free Surfaces

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Evaluation and Improvement of Productivity in High-Speed NC Machining

Journal of Manufacturing Science and Engineering ◽

10.1115/1.1286170 ◽

1999 ◽

Vol 122 (3) ◽

pp. 556-561 ◽

Cited By ~ 2

Author(s):

X. Yan ◽

K. Shirase ◽

M. Hirao ◽

T. Yasui

Keyword(s):

High Speed ◽

Nc Machining ◽

Cutting Conditions ◽

High Speed Machining ◽

Machining Time ◽

Time Constants ◽

Nc Program ◽

Kinematic Factor ◽

Two Factors

The productivity of machining centers is influenced inherently by the quality of NC programs. To evaluate productivity, first an effective feedrate factor and a productivity evaluation factor are proposed. It has been found that in high-speed machining, these two factors depend on a kinematic factor which is a function of (1) command feedrate, (2) average per-block travel of the tool, (3) moving vectorial variation of the tool, and (4) ac/deceleration or time constants. Then an NC program simulator has been developed to evaluate productivity. With the simulator, the machining time can be calculated accurately and the cutting conditions can be extracted. Finally, three NC programs were implemented on high-speed machining centers and analyzed by the simulator. It was found that in mold and die machining, the productivity can be improved by increasing the acceleration and average travel and reducing the vectorial variation of the tool rather than the command feedrate. [S1087-1357(00)01303-4]

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