scholarly journals INFLUENCE OF ROTARY CCM CASTING WHEEL WORKING SURFACE CONDITION ON STEEL PRODUCT QUALITY

2017 ◽  
pp. 50-59 ◽  
Author(s):  
Y. N. Smyrnov ◽  
A. N. Smirnov ◽  
S. V. Kuberskiy ◽  
O. Y. Smyrnov
Keyword(s):  
Product Quality ◽  
Surface Condition ◽  
Steel Product ◽  
Working Surface ◽  
Casting Wheel

FEM Simulation of the Whole Circle of Aluminum Hot Extrusion Using Circular Dies With Different Extrusion Angle

2006 ◽  
Author(s):  
A. Lontos ◽  
K.-D. Bouzakis ◽  
G. Demosthenous ◽  
A. Baldoukas
Keyword(s):  
Product Quality ◽  
Process Parameters ◽  
Surface Condition ◽  
Fem Simulation ◽  
Hot Extrusion ◽  
Die Design ◽  
Work Piece ◽  
Billet Temperature ◽  
Extrusion Die ◽  
Ram Speed

On of the most typical forming processes used for the production of long, straight semi-finished products in the form of various section geometries is extrusion. Hot extrusion is a thermo-mechanical process whish involves complicated interactions between process parameters, tooling and deforming material /1,2/. In the present paper, FEM simulation is performed in the aluminum extrusion using circular dies with different geometries in order to extract quantitative simulating results regarding various forming parameters. Most specifically the parameters that are investigated are the die design-geometry, the process parameters (i.e. ram speed, container temperature, billet temperature) and the product quality (i.e. extruded shape, surface condition). The finite element modeling is based on 3D simulation tools using the DEFORM 3D software /3–5/. The used work piece is the aluminum AA6061 in cylindrical form with a diameter of 14 mm. The used material for the extrusion die is the hot work steel AISI H13. The geometry of the die is circular with a variation in die angle. The container and the billet temperature will vary from 450 to 550 degrees, and the mandrel (ram) speed will be at the range of 2 mm/sec. On the basis of simulating results such as pressure distribution on the extrusion die, effective stresses on the billet and product quality, new and improve die geometry will be introduced. Although the simulation problem is an axisymmetric one the authors decide to proceed with 3D FEM simulation in order to examine and verify the 3D simulating results. This paper is the first part of a further research project in which more complicated die geometries will be used as simulating and experimental specimens. In addition to simulating results, experimental results will be presented in the next few months.

The Correlation between the Surface Geometry of Tested Materials and the Shape of Lubricant Drop

2013 ◽  
Vol 212 ◽  
pp. 45-48 ◽  
Author(s):  
Anna J. Dolata ◽  
Jakub Wieczorek
Keyword(s):  
Friction Pair ◽  
Surface Condition ◽  
Material Surface ◽  
Surface Geometry ◽  
Oil Film ◽  
Working Surface ◽  
Air Compressors ◽  
Friction Surfaces ◽  
Proper Operation ◽  
Lubrication Conditions

In manufacturing of air compressors, piston engines and guides, lubricants are used to result in formation of a continuous oil film that separates the friction surfaces. The continuity of this film within the entire operating range of the friction pair, from starting to steady state, is the guarantee of proper operation. The surface geometry of friction elements plays significant role in maintaining continuity of the oil film. The widely used method for obtaining proper surface condition of the structural components of piston systems is the honing process. This method consists of shaping the microgeometry of the surface of friction pair elements by material removal processing methods (turning, grinding, laser processing) to prevent rapid spreading of lubricant, and thus to prevent breaking of the oil film. In case of Al-MMCs using for manufacturing the parts of machines working under friction with lubrication conditions the shaping of their working surface by honing is limited by the machining efficiency. The investigations on surface geometry of elements made of composites including ceramic reinforcement revealed that presence of reinforcement particles on the working surface bring the changes which can be used for shaping the correct oil film. The investigations presented in this article can be used for evaluation of lubricant propagation process on the composite material surface.

scholarly journals АNALYSIS OF OPTICAL METHODS FOR MONITORING THE WORKING SURFACE STATE OF THE GRINDING WHEEL

2021 ◽  
Vol 3 ◽  
pp. 252-255
Author(s):  
Alexander Orlov ◽  
Igor Nikiforov ◽  
Pavel Maltsev ◽  
Anton Usik
Keyword(s):  
Surface Condition ◽  
Cutting Parameters ◽  
3D Models ◽  
Optical Methods ◽  
Grinding Wheel ◽  
Linear Wear ◽  
Technical Equipment ◽  
Advantages And Disadvantages ◽  
Working Surface ◽  
Dry Grinding

The article describes an analysis of non-contact optical methods for monitoring linear wear and the working surface condition of the grinding wheel during dry grinding. The presented methods are based on computer processing of photo and video materials, 3D models surface construction of the grinding wheel, the machine vision and using of the optical equipment. The advantages and disadvantages of this methods were analyzed. As a result of the conducted research, it was concluded that the usable area of the considered methods depends on the circle material, cutting parameters, control objectives, including the requirement for on-line control, and also the available material and technical equipment.

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