Temat: straightness - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: An analysis of influence of sampling strategy and scanning speed on estimation of straightness and flatness deviations with CMMs
Autorzy:: Stępień, K.
Tematy:: form deviation
flatness
straightness
CMM; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/132171.pdf Link otwiera się w nowym oknie
Opis:: The paper deals with the problem of influence of scanning speed and measuring strategy on results of flatness and straightness deviations with CMMs. The straightness was studied for various numbers of sampling points and for various scanning speeds. The flatness was investigated for various measurement paths and for various levels of scanning speeds. The results of the study indicate that applied measurement speed and selected measurement path can change obtained results very significantly.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 2.

Tytuł:: Development and verification of a high-precision laser measurement system for straightness and parallelism measurement
Autorzy:: Xu, Peng
Li, Rui Jun
Zhao, Wen Kai
Chang, Zhen Xin
Ma, Shao Hua
Fan, Kuang Chao
Tematy:: straightness
parallelism
laser measurement system
machine tool; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/1849006.pdf Link otwiera się w nowym oknie
Opis:: A laser measurement system for measuring straightness and parallelism error using a semiconductor laser was proposed. The designing principle of the developed system was analyzed. Addressing at the question of the divergence angle of the semiconductor laser being quite large and the reduction of measurement accuracy caused by the diffraction effect of the light spot at the long working distance, the optical structure of the system was optimized through a series of simulations and experiments. A plano-convex lens was used to collimate the laser beam and concentrate the energy distribution of the diffraction effect. The working distance of the system was increased from 2.6 m to 4.6 m after the optical optimization, and the repeatability of the displacement measurement is kept within 2.2 m in the total measurement range. The performance of the developed system was verified by measuring the straightness of a machine tool through the comparison tests with two commercial multi-degree-of-freedom measurement systems. Two different measurement methods were used to verify the measurement accuracy. The comparison results show that during the straightness measurement of the machine tool, the laser head should be fixed in front of the moving axis, and the sensing part should move with the moving table of the machine tool. Results also show that the measurement error of the straightness measurement is less than 3 m compared with the commercial systems. The developed laser measurement system has the advantages of high precision, long working distance, low cost, and suitability for straightness and parallelism error measurement.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The use of 3-DOF laser interferometer for rapid estimation of CNC drives settings
Autorzy:: Budzyn, Grzegorz
Rzepka, Janusz
Tematy:: machine geometry
diagonal measurement
straightness measurement
laser interferometer; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/59124059.pdf Link otwiera się w nowym oknie
Opis:: Although machine geometry measurements are an important part of mechanical engineering, they alone do not deliver enough information to set up or verify a CNC machine. The behaviour of the machine controller and its drive control settings usually need to be at least checked and in many situations corrected. In this article, on the basis of a developed machine error model, we show that it is sufficient to use a laser interferometer with a straightness measurement module to gather enough information in a single measurement to verify axis geometry and, at the same time, proper settings of machine servo loop gain. The results obtained during dynamic diagonal measurement can then be used to directly amend the servo settings. We prove our assumption in a series of real-world measurements.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Development and verification of a high-precision laser measurement system for straightness and parallelism measurement
Autorzy:: Xu, Peng
Li, Rui Jun
Zhao, Wen Kai
Chang, Zhen Xin
Ma, Shao Hua
Fan, Kuang Chao
Tematy:: straightness
parallelism
laser measurement system
machine tool; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/1849049.pdf Link otwiera się w nowym oknie
Opis:: A laser measurement system for measuring straightness and parallelism error using a semiconductor laser was proposed. The designing principle of the developed system was analyzed. Addressing at the question of the divergence angle of the semiconductor laser being quite large and the reduction of measurement accuracy caused by the diffraction effect of the light spot at the long working distance, the optical structure of the system was optimized through a series of simulations and experiments. A plano-convex lens was used to collimate the laser beam and concentrate the energy distribution of the diffraction effect. The working distance of the system was increased from 2.6 m to 4.6 m after the optical optimization, and the repeatability of the displacement measurement is kept within 2.2 m in the total measurement range. The performance of the developed system was verified by measuring the straightness of a machine tool through the comparison tests with two commercial multi-degree-of-freedom measurement systems. Two different measurement methods were used to verify the measurement accuracy. The comparison results show that during the straightness measurement of the machine tool, the laser head should be fixed in front of the moving axis, and the sensing part should move with the moving table of the machine tool. Results also show that the measurement error of the straightness measurement is less than 3 m compared with the commercial systems. The developed laser measurement system has the advantages of high precision, long working distance, low cost, and suitability for straightness and parallelism error measurement.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Development and verification of a high-precision laser measurement system for straightness and parallelism measurement
Autorzy:: Xu, Peng
Li, Rui Jun
Zhao, Wen Kai
Chang, Zhen Xin
Ma, Shao Hua
Fan, Kuang Chao
Tematy:: straightness
parallelism
laser measurement system
machine tool; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/1849061.pdf Link otwiera się w nowym oknie
Opis:: A laser measurement system for measuring straightness and parallelism error using a semiconductor laser was proposed. The designing principle of the developed system was analyzed. Addressing at the question of the divergence angle of the semiconductor laser being quite large and the reduction of measurement accuracy caused by the diffraction effect of the light spot at the long working distance, the optical structure of the system was optimized through a series of simulations and experiments. A plano-convex lens was used to collimate the laser beam and concentrate the energy distribution of the diffraction effect. The working distance of the system was increased from 2.6 m to 4.6 m after the optical optimization, and the repeatability of the displacement measurement is kept within 2.2 m in the total measurement range. The performance of the developed system was verified by measuring the straightness of a machine tool through the comparison tests with two commercial multi-degree-of-freedom measurement systems. Two different measurement methods were used to verify the measurement accuracy. The comparison results show that during the straightness measurement of the machine tool, the laser head should be fixed in front of the moving axis, and the sensing part should move with the moving table of the machine tool. Results also show that the measurement error of the straightness measurement is less than 3 m compared with the commercial systems. The developed laser measurement system has the advantages of high precision, long working distance, low cost, and suitability for straightness and parallelism error measurement.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 6.

Tytuł:: Effect of Steel Cord Tension During the Lapping on Steel Cord Straightness After Lapping
Autorzy:: Knapiński, Marcin
Bobarikin, Yuri L.
Martyanov, Yuri. V.
Tematy:: cord
stresses
tension
straightness
macrodisplacements
lina
naprężenie
makroprzemieszczenia; Pokaż więcej
Wydawca:: STE GROUP
Powiązania:: https://bibliotekanauki.pl/articles/27315807.pdf Link otwiera się w nowym oknie
Opis:: One of the variable parameters in steel cord twisting technologies is the steel cord tension before final reel. Changing this parameter is used to produce steel cord with high quality of straightness. Steel cord straightness is the most important technological parameter after tensile strength. It is simple to change the value of steel cord tension with special mechanisms or devices in composition of cable machines and twisting machines. It is very important to know the measures of tension setting. Low tension causes bad quality of steel cord and defects. High tension may brake steel cord during the twisting and lapping. Also high tension may change the mechanical properties of steel wire in the steel cord construction. The influence of steel cord tension in the range from 9 N to 30 N on active equivalent stresses in wire cross section and macro displacements of wire contact points in steel cord construction was shown. Effect of steel cord tension during the lapping on steel cord straightness after lapping was shown. In this research the optimal tension for producing steel cord 2x0.30HT was defined with numerical simulation, finite element analysis and criteria method. The optimal value of tension for other steel cord constructions will change, because of number of wires and its hardness.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Study on noises influencing the accuracy of CNC machine straightness measurements methods based on beam position detection
Autorzy:: Budzyn, Grzegorz
Rzepka, Janusz
Tematy:: laser interferometer
ISO230
machine geometry
fibre laser
straightness measurement; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/100115.pdf Link otwiera się w nowym oknie
Opis:: Fast, easy and accurate measurement of geometry of numerically controlled machines has always been challenging. With the use of a laser interferometer, it can be precise but it is complex. On the other side, the use of granite reference blocks is fairly easy yet quite limited for many machine types and sizes. Nowadays the improvements in technology open a new way – the instruments based on the detection of laser beam spot position. Those instruments are accurate and easy to use yet, comparing to the laser interferometers and granite blocks, they are sensitive to parameters of a laser source and to changing environmental conditions. In the paper, we analyse experimentally the influence of the type and parameters of laser source on the accuracy of straightness measurements. The most commonly met in practical applications a free space and fibre based laser sources are studied and compared. The influence of environmental conditions on measurement accuracy is also shown. Finally, the conclusions about optimal methods of improving the accuracy of beam position detection methods are drawn.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Uproszczone metody pomiaru błędów kształtu przedmiotów statystycznie powtarzalnych
Simplified Methods of Form Errors Measurement on Statistically Repeatable Workpieces
Autorzy:: Cellary, A.
Tematy:: pomiary prostoliniowości
pomiary okrągłości
maszyny współrzędnościowe
straightness/roundness measurement
coordinate machine; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/151771.pdf Link otwiera się w nowym oknie
Opis:: W artykule przedstawiono wielopunktowe metody pomiaru błędów kształtu. Polegają one na pomiarze odchyleń kształtu powierzchni przedmiotu w niewielkiej liczbie wybranych punktów równomiernie na niej rozmieszczonych i obliczeniu na ich podstawie wartości odchyłki kształtu. Można to wykonać dwojako, albo wybierając do obliczeń albo 2, 4 lub 6 punktów, albo interpolować profil rzeczywisty korzystając ze wszystkich punktów. Przedmioty nadające się do takich pomiarów, produkowane są seryjnie lub masowo w ustabilizowanych procesach technologicznych i mają charakterystyczne dla tych procesów kształty, powtarzalne w ujęciu statystycznym. Metody wielopunktowe są statyczne i mogą znaleźć zastosowanie w urządzeniach zmechanizowanych i automatach kontrolno-sortujących oraz jako oprogramowanie uzupełniać pomiary wykonywane na maszynach współrzędnościowych. Zasadniczym elementem jest właściwy dobór liczby punktów pomiarowych. Przyjmując jako podstawę błąd pomiaru odchyłki kształtu równy 10 % uzyskano zależności pomiędzy liczbą podziałów odcinka pomiarowego a parametrem gładkości profilu kształtu dla okrągłości i prostoliniowości.
Multipoint methods of form errors measurement have been described. they consist in measurement of form deviations of a workpiece in a few uniformly distributed selected points and in subsequent calculation of form deviation values. Two approaches are usually applied: selection of 2, 4 or 6 points or interpolation of real profile using all the points. Workspieces suitable for multipoint methods are lot/mass fabricated, using stable technologies and possess statistically repetable, characteristic forms. Multipoint methods are static and can be exploited on mechanised devices, controlling/sorting automates and as software complementing measurements performed on coordinate machines. The essential point is the proper choice of a number of measuring points. Assuming as a base 10 % form deviation error a relation has been obtained between a number of divisions of gauge length and a parameter of form smoothness for roundness and straightness measurement.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Analysis of results from a 59-years-old provenance experiment with Scots pine (Pinus sylvestris L.) in Lubień, Poland
Analiza wyników 59-letniego doświadczenia proweniencyjnego z sosną zwyczajną (Pinus sylvestris L.) w Lubieniu w Polsce
Autorzy:: Chmura, D.J.
Tematy:: Scotch pine
Polska
Pinus sylvestris
tree
straightness
Lubien
survival
productivity; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Powiązania:: https://bibliotekanauki.pl/articles/41499.pdf Link otwiera się w nowym oknie
Opis:: In 1992 and 1997 there measurements were made on an experimental area which is a part of an international provenance experiment with Scots pine (Pinus sylvestris L.), established by IUFRO in 1938. This paper presents results obtained in these measurements. It is shown that best provenances are from Baltic countries and Central Europe. The most productive provenances had the most crooked stems. Scandinavian provenances had straight trees but low survival and productivity.
W 1992 i 1997 przeprowadzono kolejne pomiary na jednej z powierzchni badawczych doświadczenia proweniencyjnego z sosną zwyczajną, założonej z inicjatywy Międzynarodowej Unii Leśnych Placówek Badawczych (IUFRO) w 1938 roku w Polsce. Dane przedstawione w tej pracy wskazują, że sosny środkowoeuropejskie i z krajów bałtyckich dają duży przyrost masy w połączeniu z dobrą jakością. Najbardziej produktywne są proweniencje z Niemiec i południowo- zachodniej Polski, ale jakość drzew jest niska. Proweniencje skandynawskie mają natomiast proste drzewa, lecz niską przeżywalność i produktywność. Obie grupy pochodzeń nie powinny być rozprzestrzeniane w Polsce.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Influence of the machining parameters on the geometry of surfaces formed by face-milling with a milling head
Wpływ parametrów skrawania na strukturę geometryczną powierzchni frezowanej czołowo głowicą frezową
Autorzy:: Miko, E.
Nowakowski, Ł.
Tematy:: skrawanie
chropowatość
falistość
prostoliniowość powierzchni
cutting
roughness
waviness
straightness
face milling; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/152546.pdf Link otwiera się w nowym oknie
Opis:: The process of surface generation is complex and depends on numerous factors. The geometry of a surface is described by the sum of all irregularities of the actual surface, i.e. deviations in form, waviness and roughness. This study focuses on determining the influence of selected cutting parameters on the surface geometry of three materials. The laboratory face milling tests were conducted using a milling head with round-nose tools.
Proces powstawania struktury geometrycznej powierzchni (SPG) jest bardzo złożony i wpływa na niego wiele czynników. Strukturę geometryczną powierzchni opisuje zbiór wszystkich nierówności powierzchni rzeczywistej tj., odchyłki kształtu, falistości, chropowatości. Podjęto próbę określenia wpływu wybranych parametrów skrawania na strukturę geometryczną powierzchni dla różnych materiałów obrabianych. Przeprowadzono badania laboratoryjne frezowania czołowego głowicą frezową z ostrzami o zaokrąglonym narożu.
Dostawca treści:: Biblioteka Nauki

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