The technique of designing high-power CNC lathes for enterprises of the heavy engineering industry (original) (raw)
Related papers
Method of Structural Design of Heavy Machine Tools
This paper presents a method of arrangement the frames of heavy lathes with dispersed forces along the coordinate axes of the loads that act on the machine while it is running. Mathematical models of large bearing systems, taking into account typical and boundary loads are developed. The field trials of the action of frames are conducted. We analyzed the movement of the frame on the coordinate axes due to its loading. A solid modeling and research of support of heavy lathe using a package Solid Works Simulation are conducted. The perspective ways to further improve the accuracy of machine tools are proposed. How to cite this article: Kovalov, V.; Antonenko, Y. and Dašić, P.: Method of Structural Design of Heavy Machine Tools. Procedia Technology, Vol. 22 (2016), pp. 146-152. ISSN 2212-0173. doi:10.1016/j.protcy.2016.01.023
Journal of Computational Design and Engineering
The preliminary design stage ensures to evaluate machine tool performances according to the simulation of reduced models. Performance criteria are defined regarding the attempted machining process requirements. In our case, we study the problem of machine tool design for hard metal cutting, where a high level of stiffness is required. In this context, this paper’s aim is to introduce a new methodology of machine tool architectures modeling, optimization, and selection with regards to their stiffness and dynamic performances at the preliminary design stage. However, this type of study requires a quantitative evaluation of performance indicators. Studied machine tool structures are modelled with simplified shape parts. The dimensions of these parts are defined as design variables. Afterward, for each considered architecture, parametric design optimization is performed to minimize its mass under the constraint of a minimal attempted stiffness all over the workspace. This approach allow...
Component Synthesis of Machine Tool and Cutter for Process Optimisation
Metal cutting is today one of the leading forming processes in the manufacturing industry. The metal cutting industry houses several actors providing machine tools and cutting tools with a fierce competition as a consequence. Extensive efforts are made to improve the performance of both machine tools and cutting tools. Performance improvements are not solely restricted to produce stronger and more durable machine tools and cutting tools. It also includes knowledge about how the machine tools and cutting tools should be used to perform at an optimum of their assembled capacity. This work presents a methodology to synthesise the dynamic behaviour of a machine tool and cutting tool assembly based on component models of the machine tool and the cutting tool. To treat the structure as an assembly of subcomponents aims first of all to reduce measurement effort to get the receptance at the tip of the machine tool/cutting tool which is needed for process stability optimisation. This methodology compares to today's state of the art methodology which require experimental modal analysis (EMA) for each cutting tool of interests mounted in the machine tool. The subcomponent approach presented here limits the EMA to the machine tool component. The machine tool component model is then connected to a component FE-model of the cutting tool of interest. The subcomponents models are obtained and coupled based on state-space formulation, a technique that is new to component synthesis of machine tool/cutting tool structures. A sensitivity analysis is also presented to raise awareness of crucial parameters that influences the result of the synthesised system. The understanding about how to assign cutting process parameters in order to optimise a cutting operation with respect to machining stability is of utmost importance to provide good productivity and process stability. This methodology opens windows not only to optimisation of an existing cutting tool but it also permits tailored cutting tool solutions for existing machining operations.
Analysis of Single Point Cutting Tool of a Lathe Machine Using FEA
2015
The geometry of cutting tool surfaces is one of the crucial parameters affecting the quality of manufacturing process and has been traditionally defined using the principles of projective geometry. The parameters of geometry defining the various cutting tool angles are described by means of taking appropriate projections of the cutting tool surfaces. Development in the field of computer Aided Geometric Design(CAGD) now provide more elegant approach for specifying the cutting tool surfaces as a set of biparametric surface patches. This study of machining processes involves analyzing the chip formation process. Years of research has conclusively shown that it a process involving plastic deformation in which large strains and strain rates are developed by localized shear deformation of work material immediately ahead of tool. Heat generated during the chip formation process as a result of plastic deformation and friction. The heat influences chip shape, tool wear, surface finish and cu...
Review Paper on Lathe Machine Components and It's Application
The lathe, probably one of the earliest machine tools, is one of the most versatile and widely used machine tool, so also known as mother machine tool [1]. It is the most essential machine tool in an engineering workshop for performing various operations on workpieces as required by the machinist. In this research paper, we have explained the working parts such as Spindle, Tailstock, Carriage, Chuck and Jaws of lathe machine as well as our study on concept of workholding accuracy and applications of lathe machine in industry.
Optimization synthesis of technological parameters during manufacturing of the parts
Eksploatacja i Niezawodność – Maintenance and Reliability
Technological ensuring the reliability of machine parts is realized by failing to reach the limited state of the elements of the technological system: machine – clamping device – metal-cutting tool-part. A method of optimization synthesis of parameters of technological processes of manufacturing machine parts has been developed. Testing the developed methodology, it was found that the metal cutting tool is Meanwhile, research has shown that metal cutting machine has the least influence on the formation of detailed quality-adjustable parameters from all the the weakest element of the technological system in terms of reliability and has the greatest impact on the quality of machined parts. elements of the process media "machine – clamping device – cutting tool". Finally, a concrete example is provided to demonstrate the effectiveness of the proposed method. The proposed technique has been successfully tested for the manufacturing process of the reduction-gear housing.
EVALUATION OF PRODUCTIVITY OF THE COMPONENTS MANUFACTURED ON C N C LATHE AND CONVENTIONAL LATHE
IJRTER , 2016
According to the degree of automation, Machine tools are classified into machine tools with manual control and automatic machine tools. The conventional lathes fall into the category of machine tools with manual control. Computer Numerical Control (CNC) machines belong to the classification under automatic machine tools. The productivity produced by the conventional lathe is influenced a lot by the skill level of the operator, since the lathe is manually operated. In addition, the scrap rates are more common in manually operated conventional lathes. In the Numerical Control (NC) lathes, the coded instructions are expressed through numerals, letters, punctuation marks and other symbols. Development in the electronics, very large scale integration (VLSI), microchips, together with advances in Computer technology led to the development and rapid growth of Computer Numerical Control (CNC). The dedicated computer in CNC lathe controls various elements and also the executive programme. In CNC machine tools, the part program punched on the tape is run only once and then stored in the computer memory. Advantages of CNC machine tools are discussed in the paper. Cylindrical stepped shaft work pieces of Mild Steel material are manufactured on Conventional lathe and also on CNC lathe. Comparative studies are conducted on the productivity of a batch of work pieces. The practical observations are presented in the paper.
One suitable type adaptation operational characteristics of universal lathe to the new needs
2014
In this paper is determined dependence on the motive power of the cutting speed for exploitative area efficiency on tool machine life and cross section chips for a universal machine tool for processing by scraping. These dependences were used to determine the main features of the optimal and maximal motive power machine. On the basis of this, analysed of the increase in motive power machine for characteristical cases in order to adapt the exploitation characteristics on the new requirements for the purpose of improve productivity. Using the previous analysis, it was determined the best solution from the aspect a rational design of the machine, while simultaneously provided the utilization of the main features on the basis of increase in rpm using increased tool life. In order to better presentation of problems, analysed in the appropriate diagrams PV and VD. On the characteristic example of manufacturing practices, at the end of this paper, is given the overview of improvements exploitation characteristics of a universal lathe appropriate calculations from the aspect of adjustment the characteristics on the new requirements, with the expectation that the reconstruction of the machine will be the lowest.
The development, manufacture and assembly of the CNC machine tool represent one side of the thing; however, the other side of the thing is to have under control the processes thanks to which this work is enabled. In addition to the detailed description of parts which such a product consists of, this book has also the effort to refer to these processes. The whole thing is watched comprehensively as the house having its foundations, perimeter walls and the roof.
In this article the causes of elastic deformations of the MFTW (machine tools, jig-fixture, cutting tool and workpiece) system and their influence on diameter obtained after turning operations using lathe machines have been investigated. The major contributing causes on this issue, such as machine tool spindle bearing elastic system, radial deformation of spindle shaft as well as the deformation of workpiece, the influence of cutting forces and the drive system dynamics, elastic deformation of the machine tools components and more other causes are identified. An attempt has been made to model the nature of influences of the above mentioned causes in an example of lathe machines. Also a simple methodology for categorising lathes in a machine shop depending upon their level of accuracies of machined products is briefly proposed. This methodology may be useful for machine shop supervisors and process design engineers to reduce the rate of machining defects for a shop floor yielding higher productivity. This work may perfectly suit the activities of manufacturing engineers handling shop floor scheduling.