scholarly journals Calculation of Deviations of Shape, Size and Location of Flat Surfaces

2019 ◽  
pp. 1-10
Author(s):  
I. I. Kravchenko ◽  
V. L. Kiselev
Keyword(s):  
Face Milling ◽  
Physical Processes ◽  
Flat Surfaces ◽  
Nominal Size ◽  
Milling Machines ◽  
Blade Machining ◽  
Machine Parts ◽  
Parameters Of Accuracy ◽  
Adjacent Plane

The development of computerization allows the development of mathematical models of physical processes with different methods of blade machining of machine parts. Modern programmable CNC machines have the ability to produce parts in an automated cycle, ensuring the requirements of the drawing. Control of the quality of processing of the main flat surfaces, which are technological and Assembly bases, should be considered in more detail. Their accuracy in accordance with the standards is determined by the shape deviations from the adjacent planes, size and relative position. The standards have instructions on how to create a virtual adjacent plane using adjustable supports and further scan the ordinates of its individual points to calculate the deviation of the form. To quantify the deviations of shape, size and location is not enough to have a field f, the vectors of which are defined from the geometric plane, given the nominal size, it is necessary to establish a base for their reference. The question of establishing bases for reference is not only of fundamental importance, since different bases can be obtained different values of deviations. The paper proposes a mathematical model for determining the named parameters of accuracy from the middle planes, which are determined by the calculated vectors at specific points of the treated surface when processing batches of blanks on milling machines face milling.

Formation of quality indicators for flat surfaces of machine parts when running them with a reinforcing roller

2021 ◽  
pp. 401-405
Author(s):  
V.I. Butenko ◽  
Ph.A. Pastukhov
Keyword(s):  
Quality Indicators ◽  
Flat Surface ◽  
Rolling Force ◽  
Functional Dependence ◽  
Roughness Parameter ◽  
Technological Problem ◽  
Flat Surfaces ◽  
Machine Parts ◽  
Rolling Mode

The forming of parameters of quality of parts flat surfaces during their rolling by strengthening roller is studied and it is shown that for each value of rolling force there are extremely achievable indicators of quality of the surface layer. It has been established that the spread of quality indicators values on the strengthened surface of the part is stabilized and becomes minimal after three passes of the roller. The functional dependence of the roughness parameter value of the part flat surface on it’s previous value and rolling mode is obtained, which allows solving a number of technological problem.

Application of Machine Vision System in the Precision Inspection

2012 ◽  
Vol 546-547 ◽  
pp. 1382-1386
Author(s):  
Yin Xia Liu ◽  
Ping Zhou
Keyword(s):  
Machine Vision ◽  
Vision System ◽  
Machine Vision System ◽  
Technical Problems ◽  
Application Program ◽  
Precision Inspection ◽  
Machine Parts

In order to promote the application and development of machine vision, The paper introduces the components of a machine vision system、common lighting technique and machine vision process. And the key technical problems are also briefly discussed in the application. A reference idea for application program of testing the quality of the machine parts is offered.

Testing the Accuracy of Surface Roughness Measurements Carried out with a Portable Profilometer

2015 ◽  
Vol 637 ◽  
pp. 69-73 ◽  
Author(s):  
Krzysztof Stępień
Keyword(s):  
Surface Roughness ◽  
Measurement Accuracy ◽  
Environmental Changes ◽  
Experimental Tests ◽  
Evaluation Procedure ◽  
Human Errors ◽  
Modern Manufacturing ◽  
Machine Parts ◽  
Roughness Measurements

Surface roughness is a factor that has a vital influence on overall quality of machine parts. This is the reason why proper measurements of surface roughness are a matter of great importance in modern manufacturing technology. Nowadays portable profilometers are common instruments to be used under industrial conditions. Measurements with such instruments can be affected by numerous factors, for example environmental changes, human errors of an operator, etc. This paper discusses problem of an evaluation of measurement accuracy of portable profilometers. It also describes the evaluation procedure and presents results experimental tests.

Particularity of the Forming Barcode Image on the Surface of Machine Parts when Marking with a Pulsed Laser

2015 ◽  
Vol 806 ◽  
pp. 83-87 ◽  
Author(s):  
Oksana Ganzulenko ◽  
Ani Petkova
Keyword(s):  
Laser Beam ◽  
Pulsed Laser ◽  
Impact Zone ◽  
Influence Of Process Parameters ◽  
Laser Marking ◽  
Pulse Laser Beam ◽  
Local Impact ◽  
Machine Parts ◽  
Metal Materials

The article is devoted to some aspects of laser marking technology for machine parts. We consider the local impact zone effect of the pulse laser beam on the surface of metal materials. The results describing the influence of process parameters on the quality of the being marked images by pulsed laser are submitted. The examples of using barcode marking on several materials for machine parts in selected technological modes of installation are given.

Thermal hardening and calculation of the mathematical model of face milling of parts made of steel 95X18-Sh to improve the quality of the surface layer

2021 ◽  
pp. 200-206
Author(s):  
I.N. Sedinin ◽  
V.F. Makarov
Keyword(s):  
Mathematical Model ◽  
Cutting Speed ◽  
Physical And Mechanical Properties ◽  
Face Milling ◽  
Experiment Planning ◽  
Depth Of Cut ◽  
Machined Surface ◽  
The Mathematical Model ◽  
Full Factorial

It is considered the complex of operations of the technological process for the heat treatment of steel 95X18-Sh, as a result of which the material of the samples increases the hardness to 59...61 HRC, and also improves the physical and mechanical properties. A full-scale full factorial experiment of face milling of samples was carried out using the method of mathematical planning. In the experiments, a high-precision machine and a carbide cutting tool were used. To calculate the values of the roughness function, the following are taken as independent variables: cutting speed, feed per tooth and depth of cut. In order to determine the coefficients of the linear equation, a central compositional orthogonal plan of the second order for three factors was used. A matrix of levels of variation of independent variable factors and a matrix of experiment planning were compiled. A regression analysis of the obtained experimental statistical data was carried out using the Microsoft Excel, Statistica and Wolfram Alpha programs. As a result of the calculations, a mathematical model of the roughness of the machined surface and optimal cutting conditions were determined.

High Definition Metrology-Based Quality Improvement of Surface Texture in Face Milling of Workpieces with Discontinuous Surfaces

2021 ◽  
pp. 1-38
Author(s):  
Guilong Li ◽  
Shichang Du ◽  
Bo Wang ◽  
Jun Lv ◽  
Yafei Deng
Keyword(s):  
Quality Improvement ◽  
Surface Texture ◽  
Mechanical Performance ◽  
Processing Parameters ◽  
Milling Process ◽  
Face Milling ◽  
Measurement Instruments ◽  
High Definition ◽  
Tool Marks

Abstract In face milling process, the quality of surface texture is vital for mechanical performance of workpieces. The quality of surface texture, especially for waviness, is directly affected by tool marks, a commonly observed phenomenon in face milling. However, appropriate approaches for evaluation and modeling of tool marks are absent to date. Limited to the resolution as well as the efficiency of conventional measurement instruments, the height data of tool marks is hard to be entirely obtained, leading to valuable information omission. Besides, most existing models of tool marks are established for general workpieces with regular geometry and continuous surfaces. Since the cutter-workpiece engagement mode has a significant impact on the generation of tool marks, current models could be inaccurate or invalid when dealing with workpieces with discontinuous surfaces. To overcome this shortage, a novel approach is proposed in this paper, aimed at quality improvement of surface texture in face milling of workpieces with discontinuous surfaces. Firstly, the evaluation indexes for tool marks are defined based on the recently developed high definition metrology (HDM). Secondly, the physical modeling of tool marks is presented, taking the face milling mechanism into account. Thirdly, the physical-informed optimization model is developed to search for the optimal processing parameters for surface quality improvement. At last, the effectiveness of the proposed approach is verified by a face milling experiment on the engine blocks.

Productivity Considerations in Face Milling

2019 ◽  
Vol 952 ◽  
pp. 66-73
Author(s):  
János Kundrák ◽  
Viktor Molnár ◽  
István Deszpoth ◽  
Tamás Makkai
Keyword(s):  
Material Removal ◽  
Removal Rate ◽  
Cutting Speed ◽  
Face Milling ◽  
Manufacturing Companies ◽  
Performance Limits ◽  
Machining Time ◽  
High Productivity ◽  
Manufacturing Time

The kinematic versions and applied tools of milling allow for the machining of several surfaces and surface combinations, making it a versatile and widely applied procedure. Face milling for cutting is used for the high productivity manufacturing of prismatic components. Naturally, the enhancement of productivity is a primary goal for manufacturing companies; this study analyzes the efficiency of material removal, which directly influences the time parameters characterizing production performed by face milling. The focus of the paper is to identify the selection of technological data (feed, feed rate, cutting speed, diameter of milling head) that can reduce the machining time or increase the values of material removal rate. Cutting experiments were carried out for machining prismatic components from AlSi9Cu3(Fe) aluminum alloy by diamond tools. It was found that within the performance limits of the manufacturing system it is possible to save a significant amount of manufacturing time while retaining the specified geometric accuracy and surface quality of the component.

Reflections on Integration by a Biopsychologist

1996 ◽  
Vol 24 (4) ◽  
pp. 292-300 ◽  
Author(s):  
Sherwood O. Cole
Keyword(s):  
World View ◽  
Human Life ◽  
Critical Examination ◽  
Physical Processes ◽  
Clinical Integration ◽  
Neurological Processes ◽  
Heterosexual Sex ◽  
The Brain ◽  
Biological Reductionism

From the vantage point of an outsider, it has been observed that most attempts at clinical integration focus on psychological and theological issues while avoiding considerations of biological influences. Two examples (homosexuality and heterosexual sex offenses) are given as a demonstration of how the inclusion of biological considerations improve the quality of integrative activity. While not having a natural affinity for biological explanations, clinical colleagues are, nevertheless, challenged to expand their view of integration to include biological dimensions. Further suggested guidelines for including biological interests in integration include (a) the human brain and mind constitute an example par excellence of God's creative purpose in human life; (b) God has chosen the physical processes of the brain/mind as a vehicle for expressing Christian experiences; and (c) problems having their source in the spiritual realm can influence neurological processes just as much as can psychological factors. Cautionary notes are offered regarding the dangers of biological reductionism and determinism to the process of integration. Finally, it is concluded that this perspective on integration is based upon a Christian world view and that all data-base sources must undergo the same degree of critical examination.

Virtual Prototyping Simulation of Flexible Multi-Point Auxiliary Support Fixture for Blade Machining

2014 ◽  
Vol 496-500 ◽  
pp. 1256-1259 ◽  
Author(s):  
Yan Cao ◽  
Jing Li ◽  
Jian Hui Tian ◽  
Qing Ming Fan
Keyword(s):  
Cutting Force ◽  
High Reliability ◽  
Virtual Prototyping ◽  
Light Weight ◽  
Machining Quality ◽  
The Poor ◽  
Blade Machining ◽  
Thin Walled ◽  
Processing Difficulty

Spatial curved blades have been widely used in major aerospace manufacturers due to their light weight, high structural efficiency, high reliability, etc. However, their processing deformation, processing difficulty, and so on limit their use. In order to deal with the situation, flexible multi-point auxiliary supporting fixture for the processing of spatial curved thin-walled parts has become a major topic of current researches. The layout of positioning and clamping points of the flexible multi-point fixture direct affects the stiffness of clamping positions on the thin-walled parts to be processed. When cutting force is definite at a certain point in machining, the greater the stiffness at the processing positions on the part, the smaller the processing deformation due to the cutting force. Therefore, in order to reduce the machining deformation due to the poor stiffness, a suitable positioning and clamping layout is needed to improve the surface stiffness at the machining positions. Thus, the machining quality of thin-walled parts can be improved.

A Feasibility Study of the Material Removal Rate of the Conical End-Face of the Optical Fiber under Polishing

2014 ◽  
Vol 518 ◽  
pp. 19-24 ◽  
Author(s):  
Ying Chien Tsai ◽  
Guang Miao Huang ◽  
Jun Hong Chen ◽  
Inn Chyn Her
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
High Quality ◽  
Flat Surfaces ◽  
The Past ◽  
Beam Delivery

The surfaces of the microlenses at the conical end-faces of optical fibers require high quality to keep the best performance of laser beam delivery. The polishing parameters play an important role to get the best quality of the microlenses. Most of the past researches study on the polishing parameters of flat surfaces. In this study, the polishing area of the conical end-face of the optical fiber is varied during fabrication. The relation between removed volume and removed thickness is built to determine the material removal rate. An experiment is carried out and the results show that the first two spinning turns are much effective for polishing under the parameters of the experiment.

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