Effekt der Sägekinematik auf die Prozesseffizienz/Kinematic variation with a circular sawbalde process

2021 ◽  
Vol 111 (01-02) ◽  
pp. 2-7
Author(s):  
Tobias Tandler ◽  
Dina Becker ◽  
Rocco Eisseler ◽  
Thomas Stehle ◽  
Hans-Christian Möhring
Keyword(s):  
Cutting Surface ◽  
Circular Sawing ◽  
Circular Saws ◽  
Sawing Process ◽  
Cutting Path

Der klassische Kreissägeprozess ist begrenzt durch die Größe des Werkstückes im Verhältnis zur Größe des Werkzeuges. Durch die Möglichkeit das Werkstück rotieren zu lassen, kann das Kreissägen auch bei größeren Werkstücken eingesetzt werden, da der benötigte Vorschubweg reduziert wird. In dieser Studie werden beide Verfahren bei gleichem Werkstück und ähnlichen Parametern gegenübergestellt, indem die jeweils erreichbaren Schnittoberflächen und die Produktivität analysiert werden.   The classic circular sawing process is limited in terms of the size of the workpiece relative to the size of the tool. By letting the workpiece rotate, it is possible to use circular saws to cut larger workpieces, as the required cutting path is reduced. The present study compares both methods based on the same workpiece and similar parameters, analyzing the achievable cutting surface.

Geklebte Schneidsegmente im unterbrochenen Schnitt*/Adhesively bonded cutting segments in intermittent cutting – Examples for their application in circular sawing of aluminum

2018 ◽  
Vol 108 (06) ◽  
pp. 466-472
Author(s):  
M. Stroka ◽  
F. Schumpp ◽  
M. Schneider
Keyword(s):  
Stress State ◽  
Experimental Investigations ◽  
Turning Process ◽  
Adhesively Bonded ◽  
The Real ◽  
Circular Saw ◽  
Circular Sawing ◽  
Sawing Process ◽  
Intermittent Cutting ◽  
Model Approach

Der Beitrag stellt Untersuchungen zu geklebten Schneidsegmenten für Kreissägeanwendungen vor. Die tatsächliche Beanspruchung des Sägeprozesses wird dabei durch einen Modellversuch abgebildet, der den Sägeprozess auf einen Drehprozess mit unterbrochenem Schnitt überträgt. So können mit geringem Aufwand vereinfachte, geklebte Proben in der Zerspanung anwendungsbezogen untersucht werden. Die Versuche wurden mit hartmetallbestückten Proben an Aluminiumwerkstücken durchgeführt.   The article presents experimental investigations of adhesively bonded cutting segments for circular saw blades. The real stress state is reproduced by a model approach which transfers the sawing process to a turning process with intermittent cutting. This allows for easily investigating the use of adhesively bonded specimens in machining. The experiments were performed with carbide-tipped specimens on aluminum workpieces.

scholarly journals Feed Force and Sawdust Geometry in Particleboard Sawing

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 945
Author(s):  
Bartosz Pałubicki ◽  
Luďka Hlásková ◽  
Stephan Frömel-Frybort ◽  
Tomasz Rogoziński
Keyword(s):  
Particle Size ◽  
Feed Rate ◽  
Cutting Forces ◽  
Design And Optimization ◽  
Machine Type ◽  
Feed Force ◽  
Circular Sawing ◽  
Cutting Kinematics ◽  
Mechanical Cutting ◽  
Sawing Process

The measurement of cutting forces permits building of physic-mechanical cutting models for a better understanding of the phenomena observed during cutting. It also permits the design and optimization of processes, machines, tools, and wood preparation. Optimization of cutting conditions of wood-based materials can decrease the cutting forces, which directly relates to the energy consumption and surface quality. The sawdust analysis may serve for analysis of cutting kinematics and occupational health risk. The aim of the study was to estimate the correlation between the feed rate and both feed force and sawdust particle size produced during particleboard circular sawing. A saw machine type K700 was used in experiments. There were three feed rates of 12, 18, and 24 m/min executed by a horizontal pneumatic actuator fixed to the sliding side table of the saw machine. Based on the results of the experiments, a positive correlation was observed between the feed rate in a circular sawing process and feed forces and an unexpected particle size distribution depending on the feed rate.

Optimization of limestone sawing using circular saws with reference to unit wear and energy

2012 ◽  
Vol 227 (5) ◽  
pp. 1069-1079 ◽  
Author(s):  
Fatih Bayram ◽  
Nazmi Erhan Yasitli ◽  
Seyfi Kulaksiz ◽  
Yilmaz Ozcelik
Keyword(s):  
Software Design ◽  
Natural Stone ◽  
Design Expert ◽  
Unit Energy ◽  
Special Software ◽  
Unique Aspect ◽  
Circular Sawing ◽  
Fully Automatic ◽  
Unit Wear ◽  
Circular Saws

Natural stone processing operations use different methods and machines; however, the circular sawing machines are widely used in natural stone processing since they can be used flexibly. The wear on the diamond segments on the sawblade and energy consumption are the important parameters for these machines. Unit wear and unit energy should be minimized and the sawing rate should be maximized for optimum sawing condition. In this study sawing tests were performed on limestone samples using a fully automatic circular sawing machine. The tests were conducted at different peripheral speeds and advance rates. For each sawing test, the segment wear and consumed energy were measured. The statistical software, Design Expert 7.0 was used to analyze the test data. The new sawability charts for wear and energy were developed. The unique aspect of this study is to determine the optimum circular sawing performance with the special software and this technique also provides the prediction of unit wear and unit energy for selected sawing condition.

scholarly journals Assessing the System Vibration of Circular Sawing Machine in Carbonate Rock Sawing Process Using Experimental Study and Machine Learning

2021 ◽  
Author(s):  
Reza Mikaeil ◽  
Mojtaba Mokhtarian ◽  
Sina Shaffiee Haghshenas ◽  
Nicola Careddu ◽  
Aref Alipour
Keyword(s):  
Machine Learning ◽  
Mechanical Properties ◽  
Prediction Models ◽  
Maintenance Cost ◽  
Depth Of Cut ◽  
Dimension Stone ◽  
Operational Parameters ◽  
System Vibration ◽  
Circular Sawing ◽  
Sawing Process

AbstractPredicting the vibration of the circular sawing machine is very important in examining the performance of the sawing process, as it shows the amount of energy consumption of the circular sawing machine. Also, this factor is directly related to maintenance cost, such that with a small increase in the level of vibration, the maintenance cost increases to a large extent. This paper presents new prediction models to assess the vibration of circular sawing machine. An evaluation model based on the imperialist competitive algorithm as one of the most efficient artificial intelligence techniques was used for estimation of sawability of the dimension stone in carbonate rocks. For this purpose, four main physical and mechanical properties of rock including Schimazek’s F-abrasivity, uniaxial compressive strength, mean Mohs hardness, and Young’s modulus as well as two operational parameters of circular sawing machine including depth of cut and feed rate, were investigated and measured. In the predicted model, the system vibration in stone sawing was considered as a dependent variable. The results showed that the system vibration can be investigated using the newly developed machine learning models. It is very suitable to assess the system vibration based on the mechanical properties of rock and operational properties.

Schwingungsüberlagerter Kreissägeprozess/Ultrasonic-assisted sawing process

2020 ◽  
Vol 110 (06) ◽  
pp. 413-417
Author(s):  
Michael Raab ◽  
Michael Stroka ◽  
Marco Schneider
Keyword(s):  
Orthogonal Cutting ◽  
Fe Model ◽  
Circular Saw ◽  
Single Tooth ◽  
First Results ◽  
Ultrasonic Assisted ◽  
Erste Ergebnisse ◽  
Set Up ◽  
Circular Saws ◽  
Sawing Process

Der Beitrag beschreibt die Auswirkung einer 20-kHz-Wechselschwingung beim Sägewerkzeug am Beispiel des orthogonalen Schnitts. Eingangs werden der Stand der Wissenschaft zu ultraschallinduzierter Reibungsreduzierung sowie die FEM-gestützte Abbildung des Schwingverhaltens scheibenförmiger Werkzeuge im 20-kHz-Bereich vorgestellt. Anschließend wird der experimentelle Versuchsaufbau beschrieben, welcher die Gegenüberstellung mit und ohne Ultraschallüberlagerung beim Zerspanvorgang anhand der zeitlich gemittelten Kraftverläufe erlaubt sowie erste Ergebnisse dazu vorgestellt.   This article describes the effects of high-frequent vibration during orthogonal cutting with circular-saw tools. An FE-model helps to visualize the vibration behavior of the circular saws at frequencies up to 20 kHz. Moreover, an experimental set-up for single-tooth-testing allows to campare oscillating and conventional teeth during the cutting process. First results of this single-tooth-testing are then presented and discussed.

scholarly journals The mechanics of sawing granite with diamond wire

2021 ◽  
Author(s):  
Janusz Stefan Konstanty
Keyword(s):  
Machine Design ◽  
Diamond Wire ◽  
Wire Saw ◽  
Diamond Wire Saw ◽  
High Incidence ◽  
Wire Vibration ◽  
Circular Sawing ◽  
Diamond Wire Sawing ◽  
Sawing Process ◽  
System Characteristics

Abstract A theoretical model of sawing granite by means of a diamond wire saw, composed of a multitude of diamond-impregnated beads mounted onto a steel rope, is presented. The wire sawing process has been contrasted with circular sawing with respect to diamond loading conditions. The analytical treatments have been supported by industrial quantitative assessments and qualitative observations. The evaluation of cutting forces as well as identification of system characteristics affecting wire vibration and wire rotation are instrumental in both machine design and tool formulation. This knowledge is also useful to diagnose and prevent problems inherent in diamond wire sawing of granite, such as the high incidence of wire breakage, unsatisfactory tool life and cutting capability, eccentric bead wear, etc.

Effect of wood thermal modification on cutting power consumption during circular sawing

2016 ◽  
Author(s):  
Р.Л. Староверов ◽  
Е.С. Шарапов ◽  
А.С. Королев
Keyword(s):  
Pinus Sylvestris ◽  
Power Consumption ◽  
Mass Loss ◽  
Quercus Robur ◽  
Betula Pendula ◽  
Untreated Wood ◽  
Short Review ◽  
Thermal Modification ◽  
Circular Sawing ◽  
Sawing Process

Статья посвящена изучению энергоемкости процессов продольного и поперечного пиления термически модифицированной древесины сосны (Pinus Sylvestris), березы (Bétula Péndula) и дуба (Quércus Róbur) круглыми пилами. Проведен краткий обзор работ в области изучения процесса пиления древесины круглыми пилами, а также анализ влияния различных факторов на процесс пиления древесины. Входные факторы эксперимента - высота и ширина пропила (мм), скорость подачи (м/мин), потеря массы древесины после термической модификации (%). Разработаны экспериментальная лабораторная установка и измерительный шлейф на основе устройства сбора данных «National Instruments USB-6008». Получены статистически значимые регрессионные модели влияния входных факторов эксперимента на энергоемкость процессов продольного и поперечного пиления термически модифицированной древесины сосны, березы и дуба круглыми пилами. Наблюдается значимое уменьшение энергоемкости процесса пиления древесины круглыми пилами с увеличением интенсивности (потери массы) термической модификации для всех исследуемых пород. Снижение мощности на продольное пиление термически обработанных образцов, в сравнении с необработанной древесиной, составило, в среднем, 14,6 и 25,6% для древесины сосны, 13,3 и 33,2% для древесины березы, 9,5 и 21,8% для древесины дуба при потерях массы соответственно 4 и 8%. Мощность при поперечном пилении термически модифицированных образцов, в сравнении с необработанной древесиной, в среднем, снизилась на 17 и 27% для древесины сосны, на 26 и 46% для древесины березы, на 10 и 17% для древесины дуба при потере массы соответственно 4 и 8%. The article concerned with the power requirements of longitudinal and transverse circular sawing process of thermally modified pine (Pinus Sylvestris), birch (Bétula Péndula) and Oak (Quércus Róbur). The short review of materials in the field of wood sawing process and effect of some factors on circular sawing are presented. Input factors of the experiment were: depth and width of sawing (mm), feeding speed (m/min) and mass loss of the specimens after thermal modification (%). An experimental laboratory setup and measuring loop on the basis of DAQ-X «National Instruments USB-6008» were developed. Regression models of correlation between input factors and power requirements of longitudinal and transverse round sawing of thermally modified timber (TMT) were received. There is a significant reduction of power consumption of TMT round sawing with increasing the intensity of thermal modification for all wood species. For longitudinal TMT sawing and 4 and 8% of mass loss in comparison with untreated wood averaged decreasing of power requirements were 14.6 and 25.6% for pine, 13.3 and 33.2% for birch, 9.5 and 21.8% for oak. For transverse TMT sawing and 4 and 8% of mass loss in comparison with untreated wood averaged decreasing of power requirements were 17 and 27% for pine, 26 and 46% for birch, 10 and 17% for oak.

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