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The rigidity and natural frequency of machine tools considerably influence cutting and generate great forces when the tool is in contact with the workpiece. The poor static rigidity of these Vertical …
Ultra-precision grinding machine design and …
The grinding center has an ultra-precision grinding station ( Fig. 1 b)) and an on-machine electrical discharge dressing station ( Fig. 1 c)), which can realize the grinding pin on-machine ...
GEAR CUTTING ON CNC VERTICAL LATHES
mination of the kinematic structure of the CNC vertical lathes, by representing the kinematic structural diagrams of these machines, which are adaptable to a larger number of machines of such type. For every case that has been studied, milling or grinding heads that can be adapted to the milling/grinding spindle ends are re-quired.
An adjustable kinematic coupling for use in machine tools …
Accordingly, this paper presents a height and tilt adjustable kinematic coupling design that is meant for use in machine tools with a high required stiffness. The initial intended application is a grinding machine for the manufacturing of large diameter (400–500 mm) thin (<100 μm) ceramic-like parts (Fig. 1). The upper platform of this ...
Structure principles of energy efficient machine tools
For that purpose a small grinding unit was developed that can be placed directly on the rolls inside the paper machine using its frame structure as support and running surface (Fig. 10 a). The movement alongside the cylinder is carried out by the small unit, for angular feed motion the rotary drive of the paper machine is utilized.
Modelling and simulation of process: Machine interaction in grinding
Abstract and Figures. This article presents an overview of current simulation methods describing the interaction of grinding process and grinding machine structure, e.g., vibrations, deflections ...
Structure Design Improvement and Stiffness Reinforcement of a Machine
Machining characteristics were applied to topology optimization for machine tool structure design improvement in this study, and the goals of lightweight and high rigidity of the structure were achieved. Firstly, an ultrasonic-assisted grinding experiment was carried out on zirconia to investigate the surface roughness, surface morphology, …
Modelling and simulation of process: machine …
This article presents an overview of current simulation methods describing the interaction of grinding process and grinding machine structure, e.g., vibrations, deflections, or …
A novel differential kinematics model to compare the kinematic …
A 5-axis CNC machine is similar to two cooperating robots, one robot carrying the workpiece and one robot carrying the tool. The 5-axis CNC machines are designed in a large variety of kinematic ...
Modelling of grinding mechanics: A review
Micro grinding force model is based on the abrasive grain kinematics, and its essence is related to the instantaneous chip thickness caused by a single abrasive …
Configuration design and accuracy analysis of special grinding machine
As shown in Fig. 2 a), the workpiece spindle device and the on-machine electric discharge truing device are fixed alongside on the work table laid on the X-Y axis, and the Z-axis is mounted on the gantry structure with the C turntable hung on it. The grinding wheel spindle is installed on the C turntable at a certain angle of inclination. If …
Gear evaluation deviations-based crucial geometric error …
The finishing gear evaluation deviations are dedicated indicators to evaluate the comprehensive performance of gear grinding machines [3,4]. ... the sensitive geometric errors and the machine tool structure. An efficient identification algorithm was proposed. ... tool is displayed and the kinematic model of the grinding wheel respected …
KINEMATIC STRUCTURES AND MACHINING …
SCIENTIFIC BULLETIN, Serie C, Volume XXIII, Fascicle: Mechanics, Tribology, Machine Manufacturing Technology ISSN 1224-3264 45 KINEMATIC STRUCTURES AND MACHINING POSSIBILITIES OF SOME CNC MACHINE ...
Geometric error identification and compensation for
Firstly, the open kinematic chain and the ideal homogeneous transformation matrix from workpiece to grinding wheel are established according to the topological structure of the CFXZAY-type, five ...
Machine Structure
In grinding, the workpiece, the grinding wheel, and the machine structure all deflect as contact is established. The real depth of cut, a e, is therefore smaller than the calculated depth of cut based on the feedrate. As in surface grinding, real depth of cut is affected by deflections, wheel wear, and thermal deflections.
Kinematic chain diagram of 5-axis turbine blade grinding machine
Machine structure of the turbine blade grinding machine is ex- plained through Fig.1 whereas its kinematic chain dia- gram is elaborated in Fig.2. ... View in full-text Similar publications
Optimization of washing machine kinematics, dynamics, …
The vibrations originating from badly distributed load inside the drum are in this paper channeled into cost functions which are used as objectives for optimization. The defined kinematic cost function deals with performance of tub motion and can ensure margins to collision of parts inside the washing machine or constitute a step in the …
(PDF) Modal Analysis of the Surface Grinding Machine Structure …
Parallel kinematic machines, are closed loop structures which have more accuracy, stiffness and ability to withstand high loads. ... For this purpose, the CAD (computer aided design) model of the surface grinding machine structure is provided in catia and then Natural frequencies and mode shapes of the machine tool structure are carried out ...
Research and development of multi-axis CNC abrasive belt-grinding …
Multi-axis CNC abrasive belt-grinding machine is an essential piece of equipment for processing the turbofan engine fan blades. The quality of blades determines whether engine performance can be further improved. As one of the important means to ensure blade quality, the measurement of the blade is still in the stage of manually hand …
Kinematics modeling and simulating of grinding …
Kinematics modeling and simulating of grinding surface topography considering machining parameters and vibration characteristics. December 2016. The International Journal of Advanced...
Double-sided milling of thin-walled parts by dual …
Sakata et al. (2018) introduced a cutting force estimation method to avoid chatter in parallel turning processes with unequal pitch angles. In addition, Yan et al. (2018) extended the parallel machining to grinding processes and reported that the grinding accuracy, stability and safety were enhanced under parallel grinding.
Structural Design of a Special Machine Tool for Internal …
In previous research on UAECG [5,7,8,9,18], very small lightweight conductive grinding wheels and integrated ultrasonic electric spindles were used; the conductive grinding wheel on-machine dressing was not considered, and all machine tools were all vertical structures. For the ICUAECG, a large conductive grinding wheel …
(PDF) GENERALIZED KINEMATIC STRUCTURE OF MACHINES …
The generalized kinematic structure is presented, which is developed on the basis of an analysis of the existing machine park and tasks for its improvement are identified. Discover the world's ...
Kinematic simulation of high-performance grinding for …
This offers the possibility to simulate any given grinding kinematics as long it is derived properly. In Fig. 3, the three operations mainly used in grinding and the equations describing their kinematics are depicted ... all deformations in the machine structure that can influence the process result into a displacement of the grinding wheel ...
Development of a 3-axis parallel kinematic machine for milling wood
Because the codes produced with Mastercam X5 in Fig. 4 were appropriate for machine types of the Cartesian structure, these codes were transformed into the motion space of the parallel delta parallel machine that had a parallel structure. The inverse kinematic equations were employed. The interface was developed in Visual Studio 2015 (Fig. 5 ...
Kinematic structures and machining possibilities of some CNC machine …
The kinematic structure of the machine (Fig. 7, a) shows that it has a main kinematic chain ( M EM -belt drive, MS -main spindle) and three feed/positioning kinematic chains
Schematic diagram of the grinder | Download …
Context 1. ... implement the grinding movement of the parallel drill point grinder, a mechanical structure with 5-DOF is desired. In the family of parallel mechanisms with limited DOF, the...
Configuration design and accuracy analysis of special grinding machine
The Sobol' method is used to analyze the globe sensitivity of the setup errors, kinematic errors and structure parameters. ... Therefore, there is a need for a special grinding machine tool with a small ball-end grinding wheel to meet the processing requirements of the component. In the design phase of machine tools, it is necessary to ...
Experimental investigations and error analysis on 3-PRS …
To control a hybrid PKM, an inverse kinematics approach was implemented to obtain the translation and rotation along the Z, X and Y- axes respectively [15]. Similarly, kinematic analyses for 3-UPU I and 3-UPU II PKM with 2R1T geometric constraints, analytic approach, and simulation tools were used to validate the kinematic solutions [16 ...
Kinematics of the grinding process
Abstract. The possibility of chip removal is governed by the section thickness, properties of metal under deformation speed, geometric parameters of cutting edges of the wheel. Randomized geometry and arbitrary location of cutting edges on the work …
