scholarly journals METHOD FOR MEASURING ERROR ESTABLISHMENT IN 5-AXIS MILLING MACHINES WITH A TOUCH PROBE

2019 ◽  
Vol 3 ◽  
pp. 77
Author(s):  
Tsvetan Kaldashev
Keyword(s):  
Mathematical Model ◽  
Measuring Error ◽  
Axis Of Rotation ◽  
Milling Machines ◽  
Touch Probe

The present paper proposes a method for measuring and compensating for error establishment. The measurement is done with a touch probe and the measuring program is a macro program. A mathematical model was developed to experimentally determine the error of non-alignment of the axis of rotation of the workpiece with the physical axis of rotation of mass C. A virtual approach to compensate for the error of establishment by using a postprocessor for the particular machine was also proposed.

scholarly journals STUDY OF ERROR ESTABLISHMENT IN MILLING MACHINES WITH 5 AXES

2019 ◽  
Vol 3 ◽  
pp. 81
Author(s):  
Tsvetan Kaldashev ◽  
Petar Hadjiiski
Keyword(s):  
Virtual Model ◽  
Disk System ◽  
Axis Of Rotation ◽  
Milling Machines

This report examines the accuracy of rotary die processing on a 5 axes machine and a special bolt-disk system. Faults that affect the accuracy and their measurement and reduction within acceptable limits are analyzed. As a result of the measurement, a virtual model of the radial beating of the workpiece relative to the actual axis of rotation of the machine was developed.

scholarly journals Research on Optimization Method of Tool Path in Five-Axis Process Singular Region

2020 ◽  
Author(s):  
Yujie Wang ◽  
Xin Shen ◽  
Yu Peng ◽  
Lixin Zhao
Keyword(s):  
Mathematical Model ◽  
Tool Path ◽  
Optimization Method ◽  
Rotating Shaft ◽  
Processing Efficiency ◽  
Machined Surface ◽  
Rapid Rotation ◽  
Singular Region ◽  
Axis Of Rotation ◽  
Five Axis

For the five-axis machine into the singular region in the process of parts processing, resulting in a discontinuous and rapid rotation of the axis of rotation of large angles. Based on the analysis of the cause of the obvious ripple on the machined surface and the influence on the machining precision, a mathematical model of the singular region is established, and an optimization method of the tool path in the singular region is proposed. The simulation and practical machining results show that the method can effectively overcome the problem of excessive movement of the rotating shaft in the Song singular region of 5-axis machine tool, and solve the surface corrugated defects caused by the problem, while improving the processing efficiency.

scholarly journals Mathematical model of a rotational reactor with a shifted axis of rotation

2018 ◽  
Author(s):  
V. L. Ganimedov ◽  
P. M. Larionov ◽  
N. A. Maslov ◽  
E. O. Tsibulskaya
Keyword(s):  
Mathematical Model ◽  
Axis Of Rotation

Computing the Global Visibility Map Using Slice Geometry for Setup Planning

2017 ◽  
Vol 139 (8) ◽  
Author(s):  
Guangyu Hou ◽  
Matthew C. Frank
Keyword(s):  
High Performance ◽  
Cnc Machining ◽  
Numerical Control ◽  
Cnc Milling ◽  
Setup Planning ◽  
Visibility Map ◽  
Axis Of Rotation ◽  
Milling Machines ◽  
Hard Problems ◽  
Rotation Map

This paper introduces a new method that uses slice geometry to compute the global visibility map (GVM). Global visibility mapping is a fundamentally important process that extracts geometric information about an object, which can be used to solve hard problems, for example, setup and process planning in computer numerical control (CNC) machining. In this work, we present a method for creating the GVM from slice data of polyhedron models, and then show how it can help determine around which axis of rotation a part can be machined. There have been various methods of calculating the GVM to date, tracing back to the well-known seminal methods that use Gaussian mapping. Compared to the considerable amount of work in this field, the proposed method has an advantage of starting from feature-free models like stereolithography (STL) files and has adjustable resolution. Moreover, since it is built upon slicing the model, the method is embarrassingly parallelizable in nature, thus suitable for high-performance computing. Using the GVM obtained by this method, we generate an axis of rotation map to facilitate the setup planning for four-axis CNC milling machines as one implementation example.

Design of Complex Component for Determination of a CNC Milling Machines Accuracy

2016 ◽  
Vol 703 ◽  
pp. 22-26
Author(s):  
Jana Moravčíková ◽  
Peter Pokorný
Keyword(s):  
Cutting Parameters ◽  
Cnc Milling ◽  
Workpiece Material ◽  
Complex Component ◽  
Geometric Tolerances ◽  
Milling Machines ◽  
Main Activity ◽  
Cut Surface ◽  
Touch Probe

The article is focused on the design of complex component to determine competence CNC milling machines designed to produce shapes with geometric tolerances by observing the shape, orientation and position of the standard EN ISO 1101. 3D model of a technological process for the production of complex components, it will contain the complete design of tools and cutting parameters for individual milling strategy, select clamping and workpiece material, a preview of the generated routing strategies and paths cut surface after each of their simulated. For milling machines with the so-called measurement system for machine OMM (On Machine Measurement), the proposal for a comprehensive parts serve as a reference in determining the accuracy of their measurements of geometric and dimensional tolerances. The main activity of systems OMM is the replace of the tool clamped in the spindle of milling machines with special touch probe which senses by the touch surface contours of produced parts.

scholarly journals INFLUENCE OF INSTANT IMBALANCE AND POSITION OF HARDNESS CENTER ON VIBROACTIVITY OF HORIZONTAL DRUM MACHINES

2021 ◽  
Vol 297 (3) ◽  
pp. 105-111
Author(s):  
Аndrii GOROSHKO ◽  
Ilona DRACH ◽  
Vitalii TKACHUK ◽  
Keyword(s):  
Mathematical Model ◽  
Lagrange Equation ◽  
Center Of Mass ◽  
Viscous Friction ◽  
Washing Machine ◽  
Axis Of Rotation ◽  
Rotary Machines ◽  
Noise Vibration ◽  
Object Of Study ◽  
The Individual

The issues of reducing the vibration caused by rotating rotors at the frequency of the first rotor harmonic (so-called rotor vibration) are among the most important in the design, manufacture and operation of almost all types of modern rotary machines. The washing machine as an object of study of the dynamics and reduction of vibration and noise is of particular interest due to the constant presence of randomly located and wandering imbalance of laundry in the drum and low requirements for accuracy of its manufacture and assembly of parts and assemblies. A mathematical model of oscillations of a multiconnected tank-drum system on elastic suspensions for the main types of machines and spin centrifuges with a horizontal axis of rotation is created. The model is developed in a linear formulation based on the Lagrange equation of the II kind for a washing machine. The accuracy and adequacy of the mathematical model was tested directly on the field object by measuring noise, vibration, forces in the supports and stress distribution in the individual elements and components of the machine in the entire range of drum speeds. Studies of the nature of system oscillations depending on the change in position and attachment points of elastic and damping elements were performed using simulation in the Simulink environment. As a result of research, the basic requirements for the layout of horizontal rotary machines of the drum type were experimentally confirmed: the center of mass of the tank must lie on the axis of rotation of the drum; the axis of rotation of the drum should be the main central axis of inertia of the tank; the center of mass of the tank must coincide with the center of mass of the loaded drum; the center of rigidity of the system of elastic supports must coincide with the center of gravity of the tank, and the main axes of rigidity – with the main central axes of inertia of the tank; the main axes of the constant viscous friction must coincide with the main central axes of inertia of the tank. The results of the theoretical study were applied to the problem of evaluating the efficiency of a liquid auto-balancing device for a proper squeezing machine depending on its dynamics.

scholarly journals Mathematical model for determining characteristic points on the radial knife of the geokhod executive body

2021 ◽  
Vol 2052 (1) ◽  
pp. 012011
Author(s):  
A B Efremenkov ◽  
V V Aksenov ◽  
V Yu Sadovets ◽  
E V Preis ◽  
D A Pashkov
Keyword(s):  
Mathematical Model ◽  
Boundary Conditions ◽  
Cutting Force ◽  
Main Axis ◽  
Axis Of Rotation ◽  
Characteristic Points ◽  
Soil Cutting ◽  
Executive Body

Abstract The article presents a mathematical model for determining the values of the characteristic points of the knife executive body (EB) of the geokhod. For this, the boundary conditions for determining the characteristic points on the radial knife of the geokhod executive body are indicated. The result of the work are the obtained expressions for determining: P a.c is the the projection of the component of the soil cutting force, depending on the cutting width, onto the main axis of rotation of the geokhod, R e.a.c is the projection of the component of the cutting force of the soil on the plane, which is located perpendicular to the main axis of rotation of the geokhod. Based on the work carried out, tasks for further research were identified.

Positional Accuracy of Holes When Drilling in Inclined Workpiece Surfaces Part 2: Mathematical Force Model

1994 ◽  
Vol 208 (2) ◽  
pp. 141-152 ◽  
Author(s):  
J Kaminski ◽  
R Crafoord
Keyword(s):  
Mathematical Model ◽  
Computer Simulations ◽  
Force Model ◽  
Positional Accuracy ◽  
Contact Areas ◽  
Axis Of Rotation

In this paper, a drill wandering mechanism when drilling in inclined workpieces is described. A mathematical model for calculation of chip areas on the chisel edge and the lips has been developed and implemented by a computer. Simulations of the forces that occur on the contact areas between the drill tip and the workpiece are presented and discussed. A mathematical model for calculation of the resultant drill deflection, deviations in the drill axis of rotation and the position of its centre point as the drill penetrates the material is also proposed.

The Method of Tension Control with Gravity Balance

2014 ◽  
Vol 590 ◽  
pp. 3-7 ◽  
Author(s):  
Hong Ren Chen ◽  
Yi Yong Yao
Keyword(s):  
Mathematical Model ◽  
Carbon Fiber ◽  
Feedback Control ◽  
Theoretical Analysis ◽  
Control Method ◽  
Fiber Material ◽  
Tension Control ◽  
Measuring Error ◽  
Fiber Placement

Carbon fiber is a fiber material, so the tension must be kept constant in the placement process. The attitude of carbon fiber placement head will change with the change of a placement path. Focusing on the problem of tension fluctuation caused by the attitude of carbon fiber placement head, gravity balance characteristic of symmetrical objects is adopted to propose a tension control method for eliminating the tension fluctuation and tension measuring error caused by gravity. In this way, the tension is kept constant depending on tension feedback control. Mathematical model and theoretical analysis show that the tension control method with gravity balance can eliminate the gravity influence on tension and make the tension keep constant.

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