Mit Einzelzähnen schneller zum Verschleiß*/Faster to wear with single teeth

2019 ◽  
Vol 109 (01-02) ◽  
pp. 8-13
Author(s):  
H.-C. Möhring ◽  
R. Eisseler ◽  
H. Ghassemi ◽  
Keyword(s):  
Machine Tools ◽  
Circular Saw ◽  
Single Tooth ◽  
The University ◽  
Turning Test

Standzeittests an Kreissägewerkzeugen sind in der Regel zeit- und materialintensiv. Am Institut für Werkzeugmaschinen (IfW) der Universität Stuttgart wird der Aufwand mithilfe von Einzahnversuchen deutlich verringert. Die Versuche basieren auf einem Leistendrehtest, der sich an die ehemalige VDI-Richtlinie VDI 3324 anlehnt und auf Drehmaschinen durchgeführt werden kann. Durch einfach gestaltete, wechselbare Leisten entsteht eine für das Sägen typische Schnittunterbrechung und es können beliebige Werkstoffe berücksichtigt werden.   Live time tests on circular saw tools are usually time-consuming and material-intensive. At the Institute for Machine Tools (IfW) of the University of Stuttgart, the required effort can be significantly reduced by conducting single tooth tests. The tests are based on a block turning test which adopts the former VDI guideline VDI 3324 and can be used on lathes. Simply designed and exchangeable blocks allow the typical cut interruption for sawing and consider any materials.

Standzeitoptimierung von Kreissägewerkzeugen/Optimization of the tool life of circular saw blades

2021 ◽  
Vol 111 (11-12) ◽  
pp. 833-839
Author(s):  
Kolb Moritz ◽  
Tim Mayer ◽  
Nico Rasenberger
Keyword(s):  
Service Life ◽  
Tool Life ◽  
Model Test ◽  
Wear Behavior ◽  
Cutting Edge ◽  
Circular Saw ◽  
Single Tooth ◽  
Cutting Edge Preparation ◽  
Saw Blade ◽  
Edge Preparation

Dieser Beitrag beschreibt, wie sich die Standzeit von Kreissägeblättern durch Schneidkantenpräparation gezielt beeinflussen lässt. Hierfür wurden zunächst einzelne Segmente aus einem Sägeblatt herausgetrennt und Einzahnproben mit variierenden Schneidenmikrogeometrien mittels Bürstspanen präpariert. Anschließend wurde das Einsatz- und Verschleißverhalten der zuvor hergestellten Proben in einem Kreissäge-Modellversuch untersucht.   This article describes how the service life of circular saw blades can be specifically influenced by cutting edge preparation. For this purpose, individual segments were first cut out of a saw blade. These single-tooth specimens with varying cutting edge microgeometries were prepared by abrasive brushing. Then the usage and wear behavior of the previously produced samples was investigated in a circular saw model test.

A. THEORY AND TECHNOLOGY OF CUTTING STEEL PIPES WITH A CIRCULAR SAW WITH INTERNAL TEETH

2020 ◽  
pp. 14-20
Author(s):  
K. Yu. Filippov ◽  
E. V. Ramenskaya ◽  
Yu. A. Filippov
Keyword(s):  
Standard Method ◽  
Structural Design ◽  
Machine Building ◽  
Educational Process ◽  
Theoretical Development ◽  
Cutting Power ◽  
Steel Pipes ◽  
Circular Saw ◽  
Production Experiment ◽  
The University

The paper deals with the design of circular and disk saws with different structural design, two of which have a patent of the “Technology of machine building” Department; performed theoretical development to determine the cutting power different from the standard method; the result of a production experiment for analyzing the cutting mode of aluminum pipes on the Italian cutting line. The results of the work are used in the educational process of the University.

scholarly journals Implementation of a Single-Tooth Pre-Doctoral CAD/CAM Dentistry Curriculum at UIC: History, Description, SWOT Analysis, and Quantitative Evaluation

2021 ◽  
Vol 11 (6) ◽  
pp. 301
Author(s):  
Kristen Vlagos ◽  
Daisy Salazar ◽  
Andrea Reale ◽  
Cortino Sukotjo ◽  
Stephanie Clarke ◽  
...  
Keyword(s):  
Clinical Outcomes ◽  
Swot Analysis ◽  
Dental Treatment ◽  
Educational Environment ◽  
University Of Illinois ◽  
Single Tooth ◽  
Cad Cam ◽  
The University ◽  
Graduating Students ◽  
Clinical Advances

A comprehensive CAD/CAM dentistry curriculum that includes broad aspects of single tooth restoration has been implemented at the University of Illinois College of Dentistry (COD) since 2010. The purpose of the program is to promote an educational environment that utilizes current technology to enhance the quality and efficiency of single-tooth dental treatment offered to patients, while also preparing graduating students to apply recent and future clinical advances. This article describes the history, organization, rationale, and objectives of the tooth-supported restorative aspects of our comprehensive pre-clinical and clinical CAD/CAM curriculum and presents the educational and clinical outcomes of this program.

Principal Developments in the Adaptive Control of Machine Tools

1983 ◽  
Vol 105 (2) ◽  
pp. 107-112 ◽  
Author(s):  
A. Galip Ulsoy ◽  
Yoram Koren ◽  
Fred Rasmussen
Keyword(s):  
Adaptive Control ◽  
Research And Development ◽  
Machine Tools ◽  
High Performance ◽  
University Of Michigan ◽  
Major Research ◽  
Ac Systems ◽  
The University

Although adaptive control (AC) systems for machine tools have a tremendous potential for improving productivity in manufacturing, their acceptance by industry has been slow. This paper identifies the major research and development areas for AC machine tools, and summarizes the principal developments of the last two decades. Current research at The University of Michigan, which is aimed at the development of stable yet high performance AC systems for turning and milling, is also described.

Chatter Avoidance in Parallel Turning With Unequal Pitch Angle Using Observer-Based Cutting Force Estimation

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Shinya Sakata ◽  
Takashi Kadota ◽  
Yuki Yamada ◽  
Kenichi Nakanishi ◽  
Hayato Yoshioka ◽  
...  
Keyword(s):  
Cutting Force ◽  
Pitch Angle ◽  
Machine Tools ◽  
Prediction Models ◽  
Chatter Vibration ◽  
Force Estimation ◽  
Angle Difference ◽  
The Stability ◽  
Stability Limits ◽  
Turning Test

Parallel turning is garnering attention as one of the most important technologies for multitasking machine tools. This is because a potential exists to enhance the stability limits compared to the turning operation using a single tool when cutting conditions are properly selected. Although stability prediction models for parallel turning have been developed in recent years, in-process monitoring and in-process chatter techniques are almost not discussed. In this study, to suppress chatter vibration, an unequal pitch turning method was proposed. In this method, the upper tool was controlled based on the optimum pitch angle calculated from spindle speed and chatter frequency. Chatter frequency was identified from estimated cutting force by a disturbance observer (DOB). From the result of the parallel turning test, it is clear that chatter vibration can be avoided by controlling the upper tool based on optimum pitch angle. Meanwhile, the pitch angle difference that can suppress chatter had a certain range. Subsequently, the robustness of the optimum pitch angle difference is experimentally evaluated by both the continuous moving test and the stepwise moving test of the pitch angle.

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.

Chatter Suppression in Parallel Turning With Unequal Pitch Using Observer Based Cutting Force Estimation

2017 ◽  
Author(s):  
Shinya Sakata ◽  
Takashi Kadota ◽  
Yuki Yamada ◽  
Kenichi Nakanishi ◽  
Hayato Yoshioka ◽  
...  
Keyword(s):  
Cutting Force ◽  
Pitch Angle ◽  
Machine Tools ◽  
Prediction Models ◽  
Chatter Vibration ◽  
Force Estimation ◽  
Chatter Suppression ◽  
The Stability ◽  
Stability Limits ◽  
Turning Test

Parallel turning attracts attention as one of the important technologies for the multi-tasking machine tools. This is because there is a potential to enhance the stability limits compared to turning operation using single tool when cutting conditions are properly selected. Although stability prediction models for parallel turning have been developed in recent years, in-process monitoring technique of chatter is almost out of focus. In this study, to suppress chatter vibration, unequal pitch turning method was proposed. In this method, the upper tool was controlled based on optimum pitch angle calculated from spindle speed and chatter frequency. Chatter frequency was identified from estimated cutting force by disturbance observer. From the result of parallel turning test, it is clear that chatter vibration can be suppressed by controlling the upper tool based on optimum pitch angle.

scholarly journals Diseño, desarrollo e implementación de una celda de manufactura didáctica para ingeniería mecatrónica en la UPTx

2019 ◽  
pp. 9-13
Author(s):  
Ariana Cano-Corona ◽  
Froylan Perez-Serrano ◽  
Álvaro Aguilar-Aguilar ◽  
Rodrigo Hernandez-Zempoaltecatl
Keyword(s):  
Machine Tools ◽  
Professional Training ◽  
Academic Program ◽  
Business Sector ◽  
Manufacturing Cell ◽  
Second Stage ◽  
Complete Development ◽  
Technological Transfer ◽  
Education Resource ◽  
The University

The present work presents the fundamentals, the main activities developed and the results so far obtained by teachers of the academic program of mechatronic engineering with the design project, and implementation of a didactic manufacturing cell for the academic program of mechatronic engineering in the laboratory of machine tools-CNC of the lt2 in the UPTx. This cell is a sample of the reinforcement and potentialization that higher education institutions can carry out to potentiate the technological transfer with the business sector of the region. The integration of the didactic manufacturing cell was carried out as an academic project in which the existing equipment in the different laboratories of the educational mechatronic engineering program was used and integrated with the design and elaboration of the missing ones for the complete development. The main benefits obtained are the strengthening of the skills and competences that students can achieve during the period of their professional training at the University, as well as familiarizing the student with industrial environments, in a second stage it is intended to use said cell as Continuous education resource with the companies of the region, as well as with the graduated students

Proceedings of The Modern Language Association of America

PMLA ◽  
1935 ◽  
Vol 50 (4) ◽  
pp. 1343-1343
Keyword(s):  
Modern Language Association ◽  
Modern Language ◽  
Local Committee ◽  
Tuesday Morning ◽  
University Of Cincinnati ◽  
The University ◽  
Plaza Hotel

The fifty-second meeting of the Modern Language Associationof America was held, on the invitation of the University of Cincinnati, at Cincinnati, Ohio, Monday, Tuesday, and Wednesday, December 30 and 31, 1935, and January 1, 1936. The Association headquarters were in the Netherland Plaza Hotel, where all meetings were held except those of Tuesday morning and afternoon. These took place at the University of Cincinnati. Registration cards at headquarters were signed by about 900, though a considerably larger number of members were in attendance. The Local Committee estimated the attendance at not less than 1400. This Committee consisted of Professor Frank W. Chandler, Chairman; Professor Edwin H. Zeydel; Professor Phillip Ogden; Mr. John J. Rowe (for the Directors); and Mr. Joseph S. Graydon (for the Alumni).

Spectrophotometric reductions with an IBM 1620

1966 ◽  
Vol 24 ◽  
pp. 116-117
Author(s):  
P.-I. Eriksson
Keyword(s):  
Astronomical Data ◽  
Spectrophotometric Data ◽  
Electronic Computers ◽  
The University ◽  
Near Future

Nowadays more and more of the reductions of astronomical data are made with electronic computers. As we in Uppsala have an IBM 1620 at the University, we have taken it to our help with reductions of spectrophotometric data. Here I will briefly explain how we use it now and how we want to use it in the near future.

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