Positioning accuracy improvement in five-axis milling by post processing

Mahbubur, R.M.D.; Heikkala, Jouko; Lappalainen, K.; Karjalainen, Jussi A.

doi:10.1016/0890-6955(95)00091-7

Cited by 61 publications

(16 citation statements)

References 5 publications

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“…When programming is performed in a CAM system using the CL data file, the angle θ 4 can be calculated using terms (1,2) and (2,2) of Eq. 31 such that: q 4 ¼ atan2ðc 3 ðs c a y5 À c c a x5 Þ À s 3 ðs c a x5 þ c c a y5 Þ; Àa z5 Þ…”

Section: Calculations Of the Angle θmentioning

confidence: 99%

“…Starting from the workpiece and moving towards the tool tip [1,2], where T means translational and R is the rotation axis, the machine denominations are given as follows: The cutting tool, a TTTRR type, is supported by a two-axis rotary head-one for head rotation and the other for tool tilting. This configuration is used in large gantry machine tools.…”

Section: Introductionmentioning

confidence: 99%

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A control algorithm for a vertical five-axis turning centre

Kvrgić¹,

Dimić²,

Cvijanovic³

et al. 2011

Int J Adv Manuf Technol

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It is very useful to accomplish turning and fiveaxis milling, drilling and boring in only one setup, which is possible on five-axis turning centres. In this paper, we present a control algorithm for this machine with two translational and three rotational axes. The turning centre has a two rotary axis head with axes that do not intersect. This increases the possibility of machining and allows for certain types of machining without the machine taking the singular positions. The high angular speed of the table required for turning causes heating of the table-bearing support and base thermal deflection. If milling or drilling is done immediately after turning, the motion of the machine axis should be corrected to eliminate the error in machining that arises because of the deflection, a correction that has been done in this paper. The solution for the forward and inverse kinematics for this type of machine allows for programming the machine motion as if the machining were performed on a five-axis gantry milling machine. This has essentially facilitated machine programming.

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Section: Calculations Of the Angle θmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A control algorithm for a vertical five-axis turning centre

Kvrgić¹,

Dimić²,

Cvijanovic³

et al. 2011

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…In the literature, compensation schemes have been presented [23][24][25]. In this paper, we adopt the following simple error compensation scheme to cancel the effect of kinematic errors.…”

Section: Error Compensationmentioning

confidence: 99%

Prediction and compensation of machining geometric errors of five-axis machining centers with kinematic errors

Uddin

Ibaraki

Matsubara

et al. 2009

Precision Engineering

130

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Abstract:Kinematic errors due to geometric inaccuracies in five-axis machining centers cause deviations in tool positions and orientation from commanded values, which consequently affect geometric accuracy of the machined surface. As is well known in the machine tool industry, machining of a cone frustum as specified in NAS979 standard is a widely accepted final perforance test for five-axis machining centers. A critical issue with this machining test is, however, that the influence of the machine's error sources on the geometric accuracy of the machined cone frustum is not fully understood by machine tool builders and thus it is difficult to find causes of machining errors. To address this issue, this paper presents a simulator of machining geometric errors in fiveaxis machining by considering the effect of kinematic errors on the three-dimensional interference of the tool and the workpiece. Kinematic errors of a five-axis machining center with tilting rotary table type are first identified by a DBB method. Using an error model of the machining center with identified kinematic errors and considering location and geometry of the workpiece, machining geometric error with respect to the nominal geometry of the workpiece is predicted and evaluated.In an aim to improve geometric accuracy of the machined surface, an error compensation for tool position and orientation is also presented. Finally, as an example, the machining of a cone frustum by using a straight end mill, as described in the standard NAS979, is considered in case studies to experimentally verify the prediction and the compensation of machining geometric errors in fiveaxis machining.

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“…Many tests added to ISO/CD 10791-6 [109] can be seen as indirect measurement focusing on the calibration of location errors of rotary axes. Many research efforts have been reported on the extension of the ball bar measurement to calibrate the location errors of rotary axes [16,[110][111][112][113][114][115][116][117][118]. Fig.…”

Section: Tracking Interferometermentioning

confidence: 99%

Indirect Measurement of Volumetric Accuracy for Three-Axis and Five-Axis Machine Tools: A Review

Ibaraki¹,

Knapp²

2012

Int. J. Automation Technol.

220

100

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The volumetric accuracy of machine tools is represented by a map of position and orientation error vectors of the tool over the volume concerned. Numerical compensation for volumetric error is possible in many latest commercial CNCs for machine tools. This paper reviews indirect measurement schemes for machine tool kinematics, in which the tool center position is measured as the superposition of error motions of linear or rotary axes. Each error motion can be separately identified by best-fitting a set of measured tool center positions to the kinematic model of machine tools. Indirect measurement schemes for the kinematics of three orthogonal linear axes, as well as the fiveaxis kinematics with two rotary axes, will be reviewed.

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Positioning accuracy improvement in five-axis milling by post processing

Cited by 61 publications

References 5 publications

A control algorithm for a vertical five-axis turning centre

A control algorithm for a vertical five-axis turning centre

Prediction and compensation of machining geometric errors of five-axis machining centers with kinematic errors

Indirect Measurement of Volumetric Accuracy for Three-Axis and Five-Axis Machine Tools: A Review

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