scholarly journals Synchronous control of linear servo systems for CNC machine tools

2003 ◽  
Author(s):  
Mi-Ching Tsai ◽  
Min-Fu Hsieh ◽  
Wu-Sung Yao
Keyword(s):  
Machine Tools ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Servo Systems ◽  
Synchronous Control

Cross Coupling Controller for Accurate Motion Synchronization of Dual Servo Systems

2013 ◽  
Vol 7 (5) ◽  
pp. 514-522 ◽  
Author(s):  
Kosuke Ishizaki ◽  
◽  
Burak Sencer ◽  
Eiji Shamoto
Keyword(s):  
Machine Tools ◽  
Cross Coupling ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Servo Systems ◽  
Tuning Method ◽  
Manufacturing Efficiency ◽  
Differential Positioning ◽  
Micro Machine ◽  
Motion Synchronization

In order to attain higher manufacturing efficiency, “dual” (two) servo systems are widely used in advanced Computer Numerical Controlled (CNC) machine tools. A well-known example is the linear motor driven gantry type of micro machine tools where dual servos are employed to drive the heavier gantry axis. Recently, dual servos are also used in spindle systems. “Double sided milling” is an example where two spindles are required to cooperatively remove material on both sides of a workpiece. Synchronization of dual servo systems is crucial for achieving the desired manufacturing accuracy. This paper presents a crosscoupling controller to accurately synchronize dualmotor driven servo systems. Proposed cross coupling controller penalizes differential positioning error between dual servo drives by modifying the reference position and velocity commands. It improves motion synchronization without affecting the overall tracking bandwidth. A tuning method for the proposed controller is also presented for the control engineer’s practice.

A Singular Value Decomposition Approach to Servo Systems Diagnosis of CNC Machine Tools

2005 ◽  
Author(s):  
Zhixiang Xu ◽  
Tim Green ◽  
Jian Liu
Keyword(s):  
Time Series ◽  
Singular Value Decomposition ◽  
Machine Tools ◽  
Singular Value ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Servo Systems ◽  
Similarity Ratio ◽  
Value Decomposition ◽  
Circular Interpolation

Based on the Singular Value Decomposition (SVD) of time series, this contribution addresses an innovative approach to provide essential information about the condition of servo systems for servo fault location or servo parameters tuning during diagnosing and calibrating CNC machine tools. When carrying out circular interpolation, the displacements of two involved axes are sampled as two independent time series. We adopt SVD algorithm to process the sampled data. A special matrix called attractor is constructed. By applying the Singular Value Ratio (SVR) spectrum, we have proposed the similarity ratio and then the similarity of two series is compared. The similarity ratio reflects the degree of mismatch between the coordinated axes.

scholarly journals Study of Machining of Gears with Regular and Modified Outline Using CNC Machine Tools

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2913
Author(s):  
Rafał Gołębski ◽  
Piotr Boral
Keyword(s):  
Machine Tools ◽  
Coordinate Measuring Machine ◽  
Optical Microscope ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Cnc Milling ◽  
Cnc Machine ◽  
Cylindrical Gears ◽  
Measuring Machine ◽  
Five Axis

Classic methods of machining cylindrical gears, such as hobbing or circumferential chiseling, require the use of expensive special machine tools and dedicated tools, which makes production unprofitable, especially in small and medium series. Today, special attention is paid to the technology of making gears using universal CNC (computer numerical control) machine tools with standard cheap tools. On the basis of the presented mathematical model, a software was developed to generate a code that controls a machine tool for machining cylindrical gears with straight and modified tooth line using the multipass method. Made of steel 16MnCr5, gear wheels with a straight tooth line and with a longitudinally modified convex-convex tooth line were machined on a five-axis CNC milling machine DMG MORI CMX50U, using solid carbide milling cutters (cylindrical and ball end) for processing. The manufactured gears were inspected on a ZEISS coordinate measuring machine, using the software Gear Pro Involute. The conformity of the outline, the tooth line, and the gear pitch were assessed. The side surfaces of the teeth after machining according to the planned strategy were also assessed; the tests were carried out using the optical microscope Alicona Infinite Focus G5 and the contact profilographometer Taylor Hobson, Talysurf 120. The presented method is able to provide a very good quality of machined gears in relation to competing methods. The great advantage of this method is the use of a tool that is not geometrically related to the shape of the machined gear profile, which allows the production of cylindrical gears with a tooth and profile line other than the standard.

Toolholder/Spindle Interfaces for CNC Machine Tools

CIRP Annals ◽  
1995 ◽  
Vol 44 (1) ◽  
pp. 383-387 ◽  
Author(s):  
J. Agapiou ◽  
E. Rivin ◽  
C. Xie
Keyword(s):  
Machine Tools ◽  
Cnc Machine Tools ◽  
Cnc Machine
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