Detektion des Vorspannungsverlusts in Kugelgewindetrieben/Detection of preload loss in ball screw drives – Optimization of machine tool maintenance with the Guard Plus system

2020 ◽  
Vol 110 (07-08) ◽  
pp. 485-490
Author(s):  
Moritz Veith ◽  
Andreas Zimmermann ◽  
Jonas Hillenbrand ◽  
Jürgen Fleischer
Keyword(s):  
Machine Tool ◽  
Product Quality ◽  
Ball Screw ◽  
Joint Development ◽  
System A ◽  
System P ◽  
Ball Screw Drives ◽  
Wear Condition

Ziel der Instandhaltung von Werkzeugmaschinen ist die Verfügbarkeitsabsicherung, um hohe Bauteilqualität und Produktivität zu gewährleisten. Die Kenntnis des Vorschubachsenzustandes, im Besonderen des Kugelgewindetriebs, ist daher von enormer Wichtigkeit. Das „Guard-Plus“-System, eine Entwicklung der August Steinmeyer GmbH und der ifm diagnostics GmbH, ermöglicht dies durch Detektion des Vorspannungsverlustes aufgrund von Verschleiß. Untersuchungen zur Systemfunktion wurden in diesem Beitrag durch das wbk Institut für Produktionstechnik durchgeführt.   The aim of machine tool maintenance is to ensure availability in order to guarantee high product quality and productivity. Knowledge of the wear condition of feed axes involved, especially the ball screw, is therefore of enormous importance. The Guard Plus system, a joint development of August Steinmeyer GmbH and ifm diagnostics GmbH, enables this by detecting the preload loss due to wear. Investigation of the system’s function are presented through wbk Institute of Production Science in the following article.

The Printed Machine Tool for Micro Machining

2014 ◽  
Vol 1018 ◽  
pp. 433-440 ◽  
Author(s):  
Christoph Batke ◽  
Karl Heinz Wurst ◽  
Armin Lechler ◽  
Alexander Verl
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Ball Screw ◽  
Work Piece ◽  
Micro Machining ◽  
Motion Generation ◽  
Alternative Drive ◽  
Space Saving ◽  
Cost Efficient ◽  
Ball Screw Drives

Machine tools for micro machining are so far not adapted to work piece sizes and process forces. They feature hardly any modularity and do not allow reconfiguration in a significant process change. One possibility to adapt the machines is to produce them from plastic or composite materials through generative methods. This “printed” machine is a reconfigurable, monolithic module, in which drives are integrated. By a cooperative motion generation, larger workspaces can be realized while the installation spaces decreases. This gives the possibility to use alternative drive technologies for example piezo-drives. Based on these methods, two small generatively produced machine tools are designed. These machine tools use two different drive principles. The first machine tool is equipped with ball screw drives which are cost efficient and space saving. The second machine tool uses piezo-actuators, which are very dynamic in motion generation. Further has to be examined, which tolerances and rigidities are needed at critical points and which parts can be produced generatively and which in a conventional way.

Direct conversion of cellulose to ethyl levulinate catalysed by modified fibrous mesoporous silica nanospheres in a co-solvent system

2021 ◽  
Vol 45 (12) ◽  
pp. 5526-5539
Author(s):  
Zhi Zhang ◽  
Zhihang Huang ◽  
Hong Yuan
Keyword(s):  
Mesoporous Silica ◽  
Solvent System ◽  
Direct Conversion ◽  
Reaction Yield ◽  
Silica Nanospheres ◽  
Ethyl Levulinate ◽  
System A ◽  
System P ◽  
Mesoporous Silica Nanospheres

A KCC-1/Al–SO3H catalyst with Si/Al = 5 was prepared to directly catalyse the synthesis of ethyl levulinate from cellulose in an ethanol/toluene co-solvent system. A reaction yield of 28.8 mol% was achieved after 6 h at 200 °C.

High-Precision Tracking Control of Machine Tool Feed Drives Based on ADRC

2016 ◽  
Author(s):  
Chengyong Zhang ◽  
Yaolong Chen
Keyword(s):  
Machine Tool ◽  
High Precision ◽  
Tracking Control ◽  
Position Control ◽  
Feedback System ◽  
Pi Controller ◽  
Ball Screw ◽  
Feed Drives ◽  
Precision Tracking ◽  
Precision Tracking Control

In this paper, the active-disturbance-rejection control (ADRC) is applied to realize the high-precision tracking control of CNC machine tool feed drives. First, according to the number of the feedback channel, the feed systems are divided into two types: signal-feedback system, e.g., linear motor and rotary table, and double-feedback system, e.g., ball screw feed drive with a load/table position feedback. Then, the appropriate controller is designed to ensure the closed-loop control performance of each type of system based on the idea of ADRC. In these control frameworks, the extended state observers (ESO) estimate and compensate for unmodeled dynamics, parameter perturbations, variable cutting load, and other uncertainties. For the signal-feedback system, the modified ADRC with an acceleration feedforward term is used directly to regulate the load/table position response. However, for the double-feedback system, the ADRC is applied only to the motor position control, and a simple PI controller is used to achieve the accurate position control of the load. In addition, based on ADRC feedback linearization, a novel equivalent-error-model based feedforward controller is designed to further improve the command following performance of the double-feedback system. The experimental results demonstrate that the proposed controllers of both systems have better tracking performance and robustness against the external disturbance compared with the conventional P-PI controller.

Instandhalter sind Mitgestalter ihres Assistenzsystems/Maintenance engineers are co-designers of their assistance system

2019 ◽  
Vol 109 (03) ◽  
pp. 189-193
Author(s):  
A. Keller ◽  
S. Adler ◽  
N. Zobel
Keyword(s):  
Technological Development ◽  
Assistance System ◽  
User Requirements ◽  
Shift Workers ◽  
System A ◽  
Work In Process ◽  
Kleine Und Mittlere Unternehmen ◽  
System P ◽  
Process Manufacturing ◽  
Maintenance Work

Im Forschungsprojekt „CPPSProcessAssist“ wurde für vier kleine und mittlere Unternehmen (KMU) der Prozessindustrie ein modulares und mobiles Assistenzsystem zur Instandhaltungsunterstützung entwickelt. Neben der technologischen Entwicklung des Systems wurde im Projekt eine Vorgehensweise zur Gestaltung und Einführung des Systems in den Unternehmen erarbeitet. Mitarbeiter der Schicht und Schichtleitung, Projektingenieure, Instandhalter sowie Technologieentwickler wurden als Mitgestalter des Systems und der daraus folgenden Veränderungen im Unternehmen eingebunden. Das resultierende System bildet die unternehmensübergreifenden Anforderungen von Instandhaltungsaufgaben in der Prozessindustrie technisch ab und ist an vorhandene IT-Infrastrukturen anpassbar. Die gewählte Vorgehensweise zur Einbindung der Mitarbeiter in der Gestaltung des Systems trug dazu bei, die unternehmens- und nutzerspezifischen Anforderungen in das System zu integrieren sowie die Mitarbeiter zu Eingabe bedarfsgerechter Assistenzinhalten zu befähigen.   A modular and portable maintenance assistance system was developed for four small and medium-sized process manufacturers in the research project CPPSProcessAssist. Along with the technological development of the system, a procedure for designing and implementing the system in the companies was developed. Shift workers and managers, project engineers, maintenance engineers and technology developers were involved in designing the system and implementing the ensuing changes in their companies. The resulting system technically maps cross-company requirements for maintenance work in process manufacturing and can be modified for existing IT infrastructures. The selected procedure for involving employees in the system design helped integrating specific company and user requirements in the system and enabling employees to enter content in the assistance system based on their needs.

scholarly journals Mahindra First Choice

2021 ◽  
pp. 354-362
Author(s):  
Ben Jackson ◽  
Genevieve Joy
Keyword(s):  
Third Party ◽  
Repair System ◽  
Market Failures ◽  
System A ◽  
Car Market ◽  
System P ◽  
First Choice ◽  
Used Car ◽  
The Creation ◽  
Trust Information

Mahindra Firstchoice illustrates the process of ecosystem orchestration in the context of the second-hand car market in India. It describes how Mahindra Firstchoice mapped the ecosystem in relation to six key parties—consumers who were buyers, consumers who were sellers, car manufacturers, independent used-car dealers, independent car service workshops, and banks. It then identified the bottlenecks and ‘pain points’ that afflicted the six parties. The used-car market did not function properly because of lack of trust, information, and transparency and Mahindra Firstchoice worked with the parties to identify solutions to the market failures. These involved, amongst other things, the creation of third-party car inspection services, the establishment of a multi-brand car-dealer franchise, a warranty system, a bluebook of second-hand prices and transactions, and a car diagnosis and repair system.

scholarly journals Effect of Stiffness of Rolling Joints on the Dynamic Characteristic of Ball Screw Feed Systems in a Milling Machine

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Dazhong Wang ◽  
Yan Lu ◽  
Tongchao Zhang ◽  
Keyong Wang ◽  
Akira Rinoshika
Keyword(s):  
Machine Tool ◽  
Dynamic Characteristic ◽  
Calculation Method ◽  
Ball Screw ◽  
Fe Model ◽  
Milling Machine ◽  
Cnc Milling ◽  
Feed System ◽  
Cnc Milling Machine ◽  
Screw Feed

Dynamic characteristic of ball screw feed system in a milling machine is studied numerically in this work. In order to avoid the difficulty in determining the stiffness of rolling joints theoretically, a dynamic modeling method for analyzing the feed system is discussed, and a stiffness calculation method of the rolling joints is proposed based on the Hertz contact theory. Taking a 3-axis computer numerical control (CNC) milling machine set ermined as a research object, the stiffness of its fixed joint between the column and the body together with the stiffness parameters of the rolling joints is evaluated according to the Takashi Yoshimura method. Then, a finite element (FE) model is established for the machine tool. The correctness of the FE model and the stiffness calculation method of the rolling joints are validated by theoretical and experimental modal analysis results of the machine tool’s workbench. Under the two modeling methods of joints incorporating the stiffness parameters and rigid connection, a theoretical modal analysis is conducted for the CNC milling machine. The natural frequencies and modal shapes reveal that the joints’ dynamic characteristic has an important influence on the dynamic performance of a whole machine tool, especially for the case with natural frequency and higher modes.

Modal Analysis of Ball Screw Based on ANSYS Software

2011 ◽  
Vol 314-316 ◽  
pp. 1981-1986 ◽  
Author(s):  
Qing Ke Yuan ◽  
Ya Nan Du ◽  
Yao Ding ◽  
Tong Le Wang
Keyword(s):  
Numerical Model ◽  
Machine Tool ◽  
Modal Analysis ◽  
Structure Analysis ◽  
Ball Screw ◽  
Feeding System ◽  
Ansys Software ◽  
Intrinsic Frequency ◽  
Vibration Model

Ball screw is an important part in the machine tool feeding system. This paper researches on the ball screw, establishes the 3D virtual numerical model by Pro/engineer. Modal analysis of ball screw is carried out in three different cases by ANSYS, then gets the intrinsic frequency and vibration model of ball screw. It provides reliable reference for further structure analysis of ball screw.

scholarly journals High-efficiency photocatalytic CO2 reduction in organic–aqueous system: a new insight into the role of water

RSC Advances ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 3798-3802 ◽  
Author(s):  
Jinliang Lin ◽  
Rongying Liao ◽  
Junli Xu
Keyword(s):  
High Efficiency ◽  
Co2 Reduction ◽  
Liquid System ◽  
Aqueous System ◽  
Binary Liquid System ◽  
Binary Liquid ◽  
System A ◽  
System P ◽  
Insight Into

A high efficiency photocatalytic conversion of CO2 into CO has been achieved by construction of a binary liquid system.

Epilogue

2018 ◽  
pp. 131-136
Author(s):  
Keith Lehrer
Keyword(s):  
Evaluation System ◽  
Conscious Experience ◽  
Theory Of Knowledge ◽  
Coherence Theory ◽  
System A ◽  
System P ◽  
Knowledge Claims ◽  
Internal Capacity

The book contains a theory of knowledge, self-trust, autonomy, and consciousness. It takes an explanatory system, a theory, to solve philosophical problems, whatever the risk of error. The theory is a coherence theory of knowledge, a defensibility theory of knowledge. The defensibility is an internal capacity supplied by an evaluation system to defend the target claim. Defense or justification that is sustained by truth in the background system is defensible knowledge. Exemplar representation of conscious experience, exemplarization, connects the system with truth by making experience self-representational. The truth-maker and the representation of it are one. The exemplarized experiences also become exhibits of what it is like to experience external entities radiating to represent them. In this way, the accepted premises of our experience, our exemplar representations, become part of the justification and defense of target knowledge claims within our evaluation system.

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