Accurate measurements in a production environment using dynamic length metrology (DLM)

Chiffre, Leonardo De; González-Madruga, D.; Costa, Giuseppe Dalla; Sonne, Mads Rostgaard; Mohammadi, Ali; Hattel, Jesper Henri; Hansen, Hans Nørgaard; Mohaghegh, Kamran; Meftahpour, M.; Meinertz, J.; Meinertz, C.

doi:10.1016/j.procir.2018.04.074

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…Figure 40 shows process control in production using a CNC comparator by Renishaw, based on the comparison of production parts to a reference master part, which compensates for changes in the thermal conditions of a shop-floor environment, and is intended for factories with wide temperature variations [241]. Applying an approach with the simultaneous measurement of part dimension and temperature over time (dynamically), supported by modelling of the thermo-mechanical effects, the corrected length at 20 °C and its measurement uncertainty can be predicted with a submicrometre uncertainty within 10 minutes after machining [69]. Probe zeroing for dynamic length measurement (DLM) under production conditions is shown in Figure 41.…”

Section: Micro-coordinate Metrologymentioning

confidence: 99%

Dimensional artefacts to achieve metrological traceability in advanced manufacturing

et al. 2020

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Section: Micro-coordinate Metrologymentioning

confidence: 99%

Dimensional artefacts to achieve metrological traceability in advanced manufacturing

et al. 2020

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“…Analysis of the above factors, their identification and partial compensation are the basic elements in improving the accuracy of machining through software process correction [ 19 , 20 ]. The difficulty in developing a uniform compensation system for all machining errors is due to the fact that only some of them depend on the machining system [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Identification of a Workpiece Temperature Compensation Model for Automatic Correction of the Cutting Process

Zawada-Tomkiewicz

Tomkiewicz

Pela³

2022

Materials

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This article describes a system for measuring and compensating for errors resulting from the cutting process in order to improve the accuracy of the workpiece. Measurements were performed by means of an automatic measurement unit. The diameter of the workpiece was measured at two points, and at the same time, the temperature at the end face of the workpiece was measured. These measurements were used in Statistical Process Control (SPC). Based on the measured values, the process stability was checked and an error correction value was determined for the next item. Moreover, the value of the correction was influenced by the assumed value of tool wear, in accordance with the adopted model, and the possibility of achieving the assumed surface quality. The diameter of the workpiece for SPC purposes was measured under industrial conditions using an automatic measurement unit, which indicates that the temperature of the workpiece during the measurement was significantly higher than the reference temperature. The study focuses on the possibility of identifying a workpiece temperature compensation model in measurements of the workpiece diameter for the purpose of introducing an additional change in the correction value. It was found that a model with a constant correction value and a linear model poorly reflect the nature of the changes. On the other hand, the Autoregressive with Extra Input (ARX) model and the Nonlinear Autoregressive with Extra Input (NLARX) model, with a neural network, are able to map the inertia of the system and map the process with greater accuracy. In this way, measurements performed in industrial conditions can more accurately determine the possibility of achieving the assumed tolerance of the finished product. At the same time, the research shows that the temperature compensation model is nonlinear, and that the maximum possible machining accuracy of the workpiece can be achieved thanks to the repeatable measurement and compensation technique.

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“…To address constantly growing manufacturing needs, integrating high accuracy measurements directly into the production is required, so that timely process control and tolerance verification can take place. This work describes the application of a method, called dynamic length metrology (DLM), developed to achieve sub-micrometer accuracy on metal parts, or micrometer accuracy on parts made from dimensionally relatively less stable materials such as polymers directly in a production environment [4][5][6]. The method consists of measuring all the quantities affecting the dimensions of a part over time (dynamically) while the part is cooling down after manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Dynamic length metrology (DLM) for accurate dimensional measurements in a production environment by continuous determination and compensation of thermal expansion effects in turning steel

Chiffre

González-Madruga

Sonne

et al. 2021

Meas. Sci. Technol.

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This work concerns the accurate dimensional measurement of metal parts directly in a production environment. Applying an approach with the simultaneous measurement of part dimension and temperature over time (dynamically) followed by modeling of the thermo-mechanical effects, the corrected length at 20 °C and its measurement uncertainty can be predicted. This paper describes a test campaign where the local diameter of a 40 mm cylindrical steel workpiece cooling down from an initial surface temperature after turning of 27 °C to an ambient temperature of 21 °C was predicted after 10 min with a systematic error of 0.5 µm and an expanded uncertainty (k = 2) of 0.9 µm.

show abstract

Accurate measurements in a production environment using dynamic length metrology (DLM)

Cited by 3 publications

References 6 publications

Dimensional artefacts to achieve metrological traceability in advanced manufacturing

Dimensional artefacts to achieve metrological traceability in advanced manufacturing

Identification of a Workpiece Temperature Compensation Model for Automatic Correction of the Cutting Process

Dynamic length metrology (DLM) for accurate dimensional measurements in a production environment by continuous determination and compensation of thermal expansion effects in turning steel

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