An Approach to Determine Clamping Forces and Clamping Sequence of Thin-Walled Workpiece during Milling Process

2012 ◽  
Vol 591-593 ◽  
pp. 580-583
Author(s):  
Xiao Yan Zuo ◽  
Bei Zhi Li ◽  
Xiao Hui Jiang ◽  
Jian Guo Yang
Keyword(s):  
Mathematical Model ◽  
Screw Theory ◽  
Milling Process ◽  
Contact Friction ◽  
Clamping Force ◽  
Minimum Modulus ◽  
New Approach ◽  
Thin Walled ◽  
Clamping Sequence

The clamping force and clamping sequence in the process of thin-walled parts is an important factor affecting the quality of the workpiece. This article focused on solving the parts clamping force of the locating point and clamping sequence, according to the process of clamping force on the workpiece, by the means of screw theory and the minimum modulus principle, taking the contact friction into account, the article established a mathematical model. Furthermore, a new approach to optimize clamping and clamping sequence has been put forward combining Matlab optimization toolbox, which provided guidance basic theory for the preload design of the clamping process and flexible clamping. Finally a detailed discussion was conducted to the calculation of clamping force and clamping sequence by using some practical examples.

REDUCING THE IMPACT OF DYNAMIC LOADS ON THE SURFACE QUALITY OF MILLED THIN-WALLED BUSHINGS

2021 ◽  
pp. 38-42
Author(s):  
M. N. Bogomolov ◽  
A. S. Yamnikov
Keyword(s):  
Analytical Description ◽  
Milling Process ◽  
The Body ◽  
Technological System ◽  
Damping Capacity ◽  
Special Role ◽  
Cutting Zone ◽  
Thin Walled ◽  
The Impact

It is shown that even under conditions of quiet cutting, self-oscillations arise when turning surfaces. A review of domestic and foreign literature showing the reasons for the formation of oscillations during cutting is given. The complexity of the analytical description of the physical processes in the cutting zone, forcing researchers to resort to mathematical modeling, is noted. It is noted that a particular difficulty is the study and description of the milling process, due to the presence of variables on the module and direction of cutting forces, leading to additional forced vibrations of the technological system. It is shown that in order to reduce vibrations in the system, it is possible to reduce cutting conditions and, accordingly, productivity, increase rigidity and damping ability of the system. When installing thin-walled v-lok on multi-purpose machines, a special role is given to clamping devices. Devices with metal expanding elements act on a limited portion of the length of the cylindrical suface, and therefore cannot increase the vibration resistance over the entire surface. The design of the mandrel with an elastic-elastic sleeve located between the body of the workpiece and the main base mandrel has been developed. Through axial compression, the elastic-elastic sleeve increases its thickness and increases the rigidity and damping capacity of the technological system, which ultimately leads to a decrease in the roughness of the treated surface by 1.5 times.

scholarly journals EXPERIMENTAL CONFIRMATION OF EQUATIONS’ ADEQUACY OF GEOMETRIC CONNECTIONS IN THE MUNICIPAL MACHINE WITH THE BRUSH WORKING BODY PARALLELOGRAPHIC SUSPENSION

2019 ◽  
Vol 15 (6) ◽  
pp. 834-843
Author(s):  
S. D. Ignatov ◽  
S. I. Tsekhosh
Keyword(s):  
Mathematical Model ◽  
Hydraulic Cylinder ◽  
Clamping Force ◽  
Vertical Coordinate ◽  
Constraint Equations ◽  
Working Element ◽  
Machine Elements ◽  
Kinematic Diagram ◽  
The Mathematical Model

Introduction. The authors arise the question of increasing the efficiency of the municipal machine. Moreover, the influence of the clamping force of the brush body on the surface and on the brush deterioration and, as a consequence, on the quality of the roadway cleaning is highlighted in the article.Methods and materials. The results of the changing process of the brushing tool vertical coordinate in the municipal machine were presented, depending on the displacement of the hydraulic cylinder rod. The analysis of the existing types of the brushing working body suspension was carried out. As a result of such analysis, the authors established the most frequent usage of the three-point and parallelogram suspensions, the schemes of which were also presented in the article.Results. The equations of geometrical connections of the municipal machine elements, which could be used in mathematical model, are presented. In addition, the kinematic diagram of the municipal machine with the brush working body suspension is drawn up. Therefore, the  presented model takes into account such parameters as the length of the levers’ arms, the linear movements of the hinges, the rod stroke, the levers’ angles and the distances between the hinges. The methods and the course of the experiment for determining the displacement dependence of the brush body from the displacement of the hydraulic cylinder rod are described. The authors also present the photographs of the experimental research fragments.Discussion and conclusions. On the basis of the obtained data, the authors construct the experimental and theoretical dependences’ graph of the brush body displacement and the actuator hydraulic cylinder rod displacement. The analysis of such graphs confirms the adequacy of the geometric constraint equations and also proves that these equations could be used in the mathematical model of the position controlling process of the brush operating body and also for determination the optimum value of the brush working element clamping force to the surface.

Fräsbearbeitung dünnwandiger Strukturen*/Error prediction and compensation in milling of thin-walled structures

2016 ◽  
Vol 106 (10) ◽  
pp. 770-774
Author(s):  
S. Wimmer ◽  
M. F. Prof. Zäh
Keyword(s):  
Experimental Study ◽  
Lightweight Design ◽  
Milling Process ◽  
Error Prediction ◽  
Wird Eine ◽  
Suggested Approach ◽  
New Approach ◽  
Geometrical Error ◽  
Thin Walled Structures ◽  
Thin Walled

Der stetig wachsende Trend zum Leichtbau in weiten Bereichen des Maschinenbaus führt zu immer filigraner werdenden Strukturen, die im Fall einer spanenden Herstellung hohe Ansprüche an den Fräsprozess stellen. Es wird eine allgemeine Vorgehensweise vorgestellt, um Formabweichungen aufgrund von Werkstückverformungen zu prognostizieren und ohne Einbußen hinsichtlich der Produktivität kompensieren zu können. Die Validität des verfolgten Ansatzes wird anhand von experimentellen Untersuchungen überprüft.   Lightweight design is continually gaining in importance within the engineering sector, thus leading to a wide array of low rigidity components that are very demanding regarding the milling process in case manufactured by cutting. Within this article a new approach is introduced in order to predict and to compensate the geometrical error caused by workpiece deflections without sacrificing productivity. An experimental study is carried out to validate the suggested approach.

Sensorische Spannbacke für die Drehbearbeitung*/Sensory clamping jaw for turning operations. Topology optimization as an enabler for clamping force measurement with integrated evaluation electronics

2019 ◽  
Vol 109 (07-08) ◽  
pp. 594-597
Author(s):  
B. Rothaupt ◽  
J. Fleischer
Keyword(s):  
Data Transmission ◽  
Energy Supply ◽  
Force Measurement ◽  
Measurement Data ◽  
Work Piece ◽  
Clamping Force ◽  
Turning Operations ◽  
New Approach ◽  
Industrial Environment ◽  
Thin Walled

Für ein sicheres und deformationsarmes Spannen dünnwandiger Bauteile in der Drehbearbeitung existiert keine Lösung, welche Kraftmessung, Datenübertragung und Energieversorgung in eine Spannbacke unter Berücksichtigung der Nachrüstbarkeit im industriellen Umfeld integriert. Im Beitrag wird der Forschungsdemonstrator einer topologieoptimierten Monoblock-Spannbacke vorgestellt, welche eine werkstücknahe Spannkraftmessung mit integrierter Energieversorgung und Datenübertragung ermöglicht.   For a safe but low deforming clamping of thin walled parts in turning processes there is no solution integrating all force measurement, data transmission and energy supply in a jaw applicable in an industrial environment. In this paper, a new approach with a topology optimized monobloc clamping jaw is presented, enabling a clamping force measurement near the work piece.

New Approach to Folding a Thin-Walled Yoshimura Patterned Cylinder

2020 ◽  
pp. 1-15
Author(s):  
Jong-Eun Suh ◽  
Tae-Hyun Kim ◽  
Jae-Hung Han
Keyword(s):  
New Approach ◽  
Thin Walled

Multifactor mathematical model of criticality of welding process of products from aluminum- magnesium alloys

2020 ◽  
pp. 12-18
Author(s):  
F.A. Urazbahtin ◽  
A.YU. Urazbahtina
Keyword(s):  
Mathematical Model ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Welding Process ◽  
Welding Equipment ◽  
Equipment Operation ◽  
Aluminum Magnesium Alloys ◽  
Aluminum Magnesium Alloy ◽  
Welding Materials

A multifactor mathematical model of the welding process of products from aluminum-magnesium alloys, consisting of 71 indicators that assess the quality of the weld, the welding process, costs, equipment operation and quality of the welded material. The model can be used to control and optimize the welding process of products from aluminum-magnesium alloys. Keywords welding, products, aluminum-magnesium alloy, indicators, process parameters, welding equipment, welding materials, electrode sharpening, lining [email protected]

Network analysis models – the secret for success

2004 ◽  
Vol 4 (5-6) ◽  
pp. 383-388
Author(s):  
D.M. Rogers
Keyword(s):  
Mathematical Model ◽  
Field Data ◽  
Essential Element ◽  
Distribution Networks ◽  
Automatic Calibration ◽  
Supply And Distribution ◽  
The World ◽  
Optimum Approach ◽  
Analysis Models

Water is a fundamental necessity of life. Yet water supply and distribution networks the world over are old and lacking in adequate maintenance. Consequently they often leak as much water as they deliver and provide an unacceptable quality of service to the customer. In certain parts of the world, water is available only for a few hours of the day. The solution is to build a mathematical model to simulate the operation of the real network in all of its key elements and apply it to optimise its operation. To be of value, the results of the model must be compared with field data. This process is known as calibration and is an essential element in the construction of an accurate model. This paper outlines the optimum approach to building and calibrating a mathematical model and how it can be applied to automatic calibration systems.

Numerical Simulation on Mold Electromagnetic Eccentric Stirring and Central Segregation of Round Bloom

2013 ◽  
Vol 652-654 ◽  
pp. 2450-2454
Author(s):  
Zhi Hong Zhang ◽  
Guo Guang Cheng
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Electromagnetic Stirring ◽  
Center Line ◽  
Central Segregation

The paper describes multi-section round bloom casting using external MEMS, equipped with max section D600mm and min D280mm mold, the center line of D280mm mold not coincident with the axis of stirrer coils. it is exist eccentric electromagnetic stirring of mold which section less than max D600mm, a mathematical model of MEMS has been established, the index of central segregation of D280mm macrostructure had decreased less than 1.12 by optimized parameters of electromagnetic stirring and SEN immerse depth, in the end, the quality of round bloom had improved.

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