Axis geometrical errors analysis through a performance test to evaluate kinematic error in a five axis tilting-rotary table machine tool

Alessandro, Velenosi; Campatelli, Gianni; Scippa, Antonio

doi:10.1016/j.precisioneng.2014.09.007

Cited by 34 publications

(5 citation statements)

References 13 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From Eqs. (12) to (24), one notes that the calculations are complex and require the handling of large amounts of data. In this way, in order to avoid calculating errors, a routine was developed using MATLAB R2014b.…”

Section: Evaluation Of the Measurement Uncertainty Associated With Thmentioning

confidence: 99%

“…Performance tests for the straightness measurement of a linear axis were carried out in CNC machine tool by Jywe and Chen [23]. A kinematic analytical model capable of correlating the work-piece geometrical errors to the axis geometrical errors of the machine tool was developed by Alessandro et al [24]. A performance evaluate strategy of grinding wheels was proposed, in the grinding of superalloys for engine components, with different degrees of grindability by Souza and Jannone [25].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Traceability for measurements carried out on incremental step loading equipment

Júnior

Leal

Pires

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

The incremental step loading technique has been widely used for material hydrogen embrittlement characterization. However, due to numerous error sources that can affect the measurement results and to the current lack of standardization, users are facing difficulties in the evaluation of measurement uncertainty as well as in the metrological performance evaluation of incremental step loading equipment. The paper deals with evaluation of the metrological performance of equipment used to characterize the susceptibility of materials to hydrogen embrittlement through use of incremental step loading technique. Additionally, a procedure is developed to estimate the measurement uncertainty associated with the results obtained during the test. Two equipment configurations were verified. The first one, with a load cell of 20 kN, was used for test specimens with nominal dimensions of 30 mm, 30 mm and 200 mm in width, thickness and length, respectively; and the second, with a 1 kN load cell was used for test specimens with nominal dimensions of 10 mm × 10 mm × 60 mm. Three measurands were evaluated in each assemblage (force applied on the specimen, equipment arm positioning angle and stress). Several metrological parameters were estimated (bias, accuracy, expanded uncertainty, repeatability, maximum error, hysteresis and nonlinearity). The effectiveness of the proposed procedure for uncertainty assessment was tested by calculation of the uncertainty associated with lower value for fast fracture strength. From the obtained results, it was concluded that the two equipment configurations had excellent metrological properties, in both the loading and unloading phases. It was shown that the proposed procedure can properly estimate the uncertainty associated with measurement on incremental step loading testing. Considering the widely use of the incremental step loading technique, the results here presented can be particularly useful for ensuring the traceability of results to the International System of Units required by the ISO 17025 standard.

show abstract

Section: Evaluation Of the Measurement Uncertainty Associated With Thmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Traceability for measurements carried out on incremental step loading equipment

Júnior

Leal

Pires

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…In micro-features machining, accuracy is the most critical factor which is been affected by thermal errors, force-induced errors (FIEs), geometric errors, and others like clamping, table surface, a programming error in the CAM, and interpolation in the CNC [ 10 , 11 ]. The assembly and the component defects of the machine tool define its geometric errors; moreover, several improvements have been done currently to minimize them by some researchers [ 10 , 12 – 16 ]; dynamic errors affect the dynamic machining process, which significantly contributes to the other error factors [ 17 ], and the International Organization for Standardization 230 (ISO) has developed several schemes of measuring techniques to reduce dynamic error [ 18 , 19 ]. Both the non-machining test and the standard piece test have been used for the dynamic performance test; though the dynamic errors have no standardized measuring method, however, the double ball-bar (DBB) and the R-test devices have been used in their identification non-machining test [ 20 – 23 ].…”

Section: Introductionmentioning

confidence: 99%

Kinematics and geometric features of the s-cone test piece: identifying the performance of five-axis machine tools using a new test piece

Osei

Wang

Ding

2023

Int J Adv Manuf Technol

View full text Add to dashboard Cite

The design of machine parts of different sizes and shapes has become relevant in the manufacturing industry which requires five-axis machine tools of high dynamic performance; different machining test pieces have been used to test and reflect the machine tool’s performance. The S-shaped is still under development and consideration of which a new test piece better than the S-shaped part has been recommended to be put forward making the NAS979 the only standardized test piece; however, it has some limitations. Hence, this study proposes a new test piece to objectively satisfy the demand for machine tools with higher dynamic performance, which shows much improvement over the standard NAS979 and is the best alternative to the S-shaped test piece, and it combines the geometric and kinematic features of both test pieces. Geometrically, it has non-uniform surface continuity, variable twist angle, and variable curvature; and the cutting tool moves in close and opened angles along the tool path; there is sudden rise and fall of axes’ velocity, acceleration, and jerk with much impact during machining which makes the S-cone test piece be machined by only five-axis machine tools with high dynamic performance, and has a better dynamic performance identification effect than the S-shaped test piece based on the trajectory test. Detailed work on the validation of the machine tool’s dynamic performance using the S-cone part will be captured next part of this study.

show abstract

“…Among the key parts of the machine tool, the CNC turntable plays the role of supporting and driving the workpieces to rotate. In addition to having a certain bearing capacity, the dynamic characteristics of the CNC turntable have a great impact on the machining accuracy of the machine tool [4][5][6]. Due to the continuous development of high-speed machining technology, the requirements for the rotational speed of CNC turntable are becoming higher and higher.…”

Section: Introductionmentioning

confidence: 99%

Bionic optimization design for a CNC turntable based on thermal–mechanical coupling effect

Liu

Mao

2020

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

During the machining process, the thermal-mechanical coupling effect of CNC turntable is produced by the action of variable loads and various heat sources. In order to improve the static and dynamic characteristics under thermal-mechanical coupling effect, a novel bionic optimization design method for CNC turntable was proposed. The finite element modal analysis on a CNC turntable was carried out to obtain the weak link of its dynamic characteristics, and the thermal-mechanical coupling analysis on the CNC turntable was conduct to reveal the influence of the thermal-mechanical coupling effect on the dynamic characteristics of the CNC turntable. In view of the good mechanical properties of Victoria amazonica, bionic design for the CNC turntable was carried out based on the strong similarity of structure and function. The optimization objectives and design variables of bionic CNC turntable were selected according to the thermal-mechanical coupling and modal analysis results, and the influence law of the design variables on the optimization objectives was studied by sensitivity analysis method. The optimal solution to bionic CNC turntable was obtained through response surface optimization, which made the maximum deformation was reduced by 2.37%, the mass was reduced by 15.60%, and the first six order natural frequencies were increased. The feasibility of the proposed bionic optimization design method for CNC turntable was verified through comparing the first six order natural frequencies of modal experimental results with optimization results. Therefore, the bionic optimization method provides a new idea for structural design of CNC machine tools' parts to improve the static and dynamic characteristics.

show abstract

Axis geometrical errors analysis through a performance test to evaluate kinematic error in a five axis tilting-rotary table machine tool

Cited by 34 publications

References 13 publications

Traceability for measurements carried out on incremental step loading equipment

Traceability for measurements carried out on incremental step loading equipment

Kinematics and geometric features of the s-cone test piece: identifying the performance of five-axis machine tools using a new test piece

Bionic optimization design for a CNC turntable based on thermal–mechanical coupling effect

Contact Info

Product

Resources

About