An Evaluation Method for Two-Dimensional Position Errors and Assembly Errors of a Rotational Table on a 4 Axis Machine Tool
This paper describes a method to measure and
compensate a 4 axes ultra-precision machine tool that generates micro
patterns on the large surfaces. The grooving machine is usually used
for making a micro mold for many electrical parts such as a light guide
plate for LCD and fuel cells. The ultra precision machine tool has three
linear axes and one rotational table. Shaping is usually used to
generate micro patterns. In the case of 50 μm pitch and 25 μm height
pyramid pattern machining with a 90° wedge angle bite, one of linear
axis is used for long stroke motion for high cutting speed and other
linear axis are used for feeding. The triangular patterns can be
generated with many times of long stroke of one axis. Then 90°
rotation of work piece is needed to make pyramid patterns with
superposition of machined two triangular patterns.
To make a two dimensional positioning error, straightness of two
axes in out of plane, squareness between the each axis are important.
Positioning errors, straightness and squarness were measured by laser
interferometer system. Those were compensated and confirmed by
ISO230-6. One of difficult problem to measure the error motions is
squareness or parallelism of axis between the rotational table and
linear axis. It was investigated by simultaneous moving of rotary table
and XY axes. This compensation method is introduced in this paper.
[1] Y. Takeuchi, H. Yonekura and K Sawada, "Creation of 3-D tiny statue by
5-axis control ultraprecision machining," Computer-Aided Design, Vol.
35, No. 4, pp. 403-409, 2003.
[2] S. Gan, H. , Lim, M. Rahman and W. Frank "A fine tool servo system for
global position error compensation for a miniature ultra-precision lathe,"
International Journal of Machine Tools & Manufacture, Vol. 47, No. 7-8,
pp. 1302-1310, 2007.
[3] Bono, M. and Hibbard, R., "A flexure-based tool holder for sub-╬╝m
positioning of a single point cutting tool on a four-axis lathe," Precision
Engineering, Vol. 31, No. 2, pp. 169-176, 2007.
[4] A.C. Okafor, Y.M. Ertekin, Derivation of machine tool error models and
error compensation procedure for three axes vertical machining.
International Journal of Machine Tools and Manufacture. 2000; 40;
1199-1213.
[5] C. Raksiri,M. Parnichkun, Geometric and force errors compensation in a
3-axis CNC milling machine, International Journal of Machine Tools and
Manufacture. 2005; 44; 1283-1291.
[6] A.H. Slocum, Precision Machine Design, Prentice Hall, Englewood Cliffs,
NJ, 1992.
[7] ISO230-6, Test Code for Machine Tools-Part 6: Determination of
Positioning Accuracy on Body and Face Diagonals (Diagonal
Displacement Tests) 2002.
[8] M.A.V. Chapman, Limitations of laser diagonal measurements, Precision
Engineering; 2003; 27 ; 401-406.
[9] J. Hwang, C.H. Park, C.H.Lee and S.W. Kim, "Estimation and correction
method for the two-dimensional position errors of a planar XY stage
based on motion error measurements," International Journal of Machine
Tools and Manufacture, 46, pp. 801-810, 2006.
[1] Y. Takeuchi, H. Yonekura and K Sawada, "Creation of 3-D tiny statue by
5-axis control ultraprecision machining," Computer-Aided Design, Vol.
35, No. 4, pp. 403-409, 2003.
[2] S. Gan, H. , Lim, M. Rahman and W. Frank "A fine tool servo system for
global position error compensation for a miniature ultra-precision lathe,"
International Journal of Machine Tools & Manufacture, Vol. 47, No. 7-8,
pp. 1302-1310, 2007.
[3] Bono, M. and Hibbard, R., "A flexure-based tool holder for sub-╬╝m
positioning of a single point cutting tool on a four-axis lathe," Precision
Engineering, Vol. 31, No. 2, pp. 169-176, 2007.
[4] A.C. Okafor, Y.M. Ertekin, Derivation of machine tool error models and
error compensation procedure for three axes vertical machining.
International Journal of Machine Tools and Manufacture. 2000; 40;
1199-1213.
[5] C. Raksiri,M. Parnichkun, Geometric and force errors compensation in a
3-axis CNC milling machine, International Journal of Machine Tools and
Manufacture. 2005; 44; 1283-1291.
[6] A.H. Slocum, Precision Machine Design, Prentice Hall, Englewood Cliffs,
NJ, 1992.
[7] ISO230-6, Test Code for Machine Tools-Part 6: Determination of
Positioning Accuracy on Body and Face Diagonals (Diagonal
Displacement Tests) 2002.
[8] M.A.V. Chapman, Limitations of laser diagonal measurements, Precision
Engineering; 2003; 27 ; 401-406.
[9] J. Hwang, C.H. Park, C.H.Lee and S.W. Kim, "Estimation and correction
method for the two-dimensional position errors of a planar XY stage
based on motion error measurements," International Journal of Machine
Tools and Manufacture, 46, pp. 801-810, 2006.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:55954", author = "Jooho Hwang and Chang-Kyu Song and Chun-Hong Park", title = "An Evaluation Method for Two-Dimensional Position Errors and Assembly Errors of a Rotational Table on a 4 Axis Machine Tool", abstract = "This paper describes a method to measure and
compensate a 4 axes ultra-precision machine tool that generates micro
patterns on the large surfaces. The grooving machine is usually used
for making a micro mold for many electrical parts such as a light guide
plate for LCD and fuel cells. The ultra precision machine tool has three
linear axes and one rotational table. Shaping is usually used to
generate micro patterns. In the case of 50 μm pitch and 25 μm height
pyramid pattern machining with a 90° wedge angle bite, one of linear
axis is used for long stroke motion for high cutting speed and other
linear axis are used for feeding. The triangular patterns can be
generated with many times of long stroke of one axis. Then 90°
rotation of work piece is needed to make pyramid patterns with
superposition of machined two triangular patterns.
To make a two dimensional positioning error, straightness of two
axes in out of plane, squareness between the each axis are important.
Positioning errors, straightness and squarness were measured by laser
interferometer system. Those were compensated and confirmed by
ISO230-6. One of difficult problem to measure the error motions is
squareness or parallelism of axis between the rotational table and
linear axis. It was investigated by simultaneous moving of rotary table
and XY axes. This compensation method is introduced in this paper.", keywords = "Ultra-precision machine tool, muti-axis errors,squraness, positioning errors.", volume = "4", number = "2", pages = "198-4", }