Experimental Researches upon Changes of a Pipe's Roughness after Hydroformation

2013 ◽  
Vol 371 ◽  
pp. 111-115
Author(s):  
Bogdan Constantin Vaceanu ◽  
Gheorghe Nagit ◽  
Vasile Huian
Keyword(s):  
Surface Roughness ◽  
Tube Hydroforming ◽  
Work Piece ◽  
Copper Pipe ◽  
Work Area ◽  
The Coefficient Of Friction ◽  
Hydroforming Process ◽  
Aluminum Pipe ◽  
Experimental Researches

Surface roughness was studied in the tube hydroforming process, considering the quality of the material and the coefficient of friction between the work piece and die. Other researchers have studied the surface roughness to the front of an aluminum pipe [. The aim of this work was to analyze changes in a copper pipe roughness occurred after hydroforming process with fluid. Effects of changing roughness were studied, following the deformation of the material in the work area and roughness changes occurring in the material flow. After achieving hydroforming process, the surface roughness was measured by electron microscopy SEM in different areas of the hydro formed tube. After hydroforming process, an increase of surface roughness in connection areas of the mold to the curvature and the transverse direction of the pipe.

An Approach to the Influence of Flotative Abrasive Balls on Polishing Process

2006 ◽  
Vol 532-533 ◽  
pp. 393-396 ◽  
Author(s):  
Yong Dai ◽  
Qian Fa Deng ◽  
Xun Lv ◽  
Ju Long Yuan ◽  
Xun Jie Yu
Keyword(s):  
Surface Roughness ◽  
Grain Size ◽  
Removal Rate ◽  
Great Influence ◽  
Work Piece ◽  
Polishing Process ◽  
Soft Contact ◽  
Ball Diameter ◽  
Experiment Device

Polishing with Flotative Abrasive Balls(FABs) is a kind of soft contact polishing means， and the conventional polishing plate and pad are not needed in this case. The pressure of polishing is the flotage which is the upward force that a fluid exerts on the FABs, but the movement of work piece is similar to that in conventional polishing, the removal rate and quality of polishing is influenced by FAB and its flotage. An experiment device is built up and two kinds of FAB are designed and produced. Some primary experiments are carried out in order to investigate the influences of the size of FABs on the removal rate and surface roughness in polishing with FABs. It is found from the experiments that the grain size and the layers of FAB may have great influence on the removal rate of polishing; the surface roughness is mainly decided by the ball diameter and the layers of FAB. The results of experiments are discussed and analyzed, it indicates that the efficiency and quality depend on flotage and the number of active grains when the velocity of workpiece is assigned.

Experimental Researching of Thermal - Assisted Milling with Induction on Surface Roughness of SKD11 Steel

2019 ◽  
Vol 889 ◽  
pp. 190-196
Author(s):  
Mac Thi Bich ◽  
Pham Thi Hoa ◽  
Banh Tien Long ◽  
Nguyen Duc Toan
Keyword(s):  
Surface Roughness ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
End Milling ◽  
Heating Process ◽  
Work Piece ◽  
Technical Parameters ◽  
Roughness Model ◽  
Good Agreement

This paper presents experimental studied results about surface roughness during end milling SKD11 steel under room temperature and work-piece preheated condition. Conventional samples were first performed. The samples which are same technical parameters were then performed at elevated temperatures to evaluate effective of heating process on the surface roughness. Orthogonal array Taguchi method was used to experimental design. The results showed that the surface quality of product was significantly improved under thermal - assisted milling. The surface roughness model during machining at room and elevated temperatures were evaluated and showed a good agreement with result of experiments.

Evaluation of Stamping Lubricants in Forming Galvannealed Steels for Industrial Application

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
Soumya Subramonian ◽  
Nimet Kardes ◽  
Yurdaer Demiralp ◽  
Milan Jurich ◽  
Taylan Altan
Keyword(s):  
Preliminary Test ◽  
Work Piece ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Deep Draw ◽  
Fe Simulations ◽  
Water Based ◽  
The Coefficient Of Friction ◽  
Synthetic Water

Lubrication is one of the process variables that affect the quality of stamping sheet materials. Using a good lubricant can significantly reduce scrap rate and/or improve the quality of stamping. In this study, different types of lubricants were evaluated using strip draw test (SDT) and deep draw test (DDT) for stamping of galvannealed steel sheets. Finite element (FE) simulations were carried out to determine the coefficient of friction at tool-work piece interface during deep drawing under different lubrication conditions and blank holder forces. Flow stress data of materials under biaxial load which are used in FE simulations are obtained by viscous pressure bulge tests. SDT was used as a preliminary test to evaluate the relative performance of the lubricants. Lubricants that showed good performance in this test were tested using DDT. Dimensions of the formed strips and cups and the maximum applicable blank holder force to draw parts without fracturing were the criteria used for evaluation of lubricants in both tests. In general, it was possible to form cups with higher blank holder force when synthetic/water-based lubricants were applied to the sheet. In conclusion, evaluated synthetic/water-based lubricants had better lubricity than petroleum-based lubricants.

Correlating the Features of Topography to Friction by Sliding Experiments

2008 ◽  
Author(s):  
Anirudhan Pottirayil ◽  
Pradeep L. Menezes ◽  
Satish V. Kailas
Keyword(s):  
Sheet Metal ◽  
Coefficient Of Friction ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Work Piece ◽  
Manufacturing Processes ◽  
Experimental Procedure ◽  
The Coefficient Of Friction ◽  
Soft Metal

Friction can influence the quality of the finished product to a large extent in certain manufacturing processes. Sheet metal forming is a particular case, where the friction between the hard-die and the relatively soft work-piece can be extremely important. Under such conditions, topography of the harder surface can influence the resistance to traction at the interface. This paper discusses about the correlation between certain features of the surface topography and coefficient of friction based on experiments involving sliding of a few soft metal pins against a harder material. A brief description of the experimental procedure and the analysis are presented. A hybrid parameter which encapsulates both the amplitude features as well as the relative packing of peaks is shown to correlate well with the coefficient of friction.

Experiment Research on Surface Roughness in Micro-Grinding Metal Material

2014 ◽  
Vol 1017 ◽  
pp. 500-505 ◽  
Author(s):  
Ya Dong Gong ◽  
Xue Long Wen ◽  
Zhong Xiao Zhu ◽  
Jun Cheng ◽  
Guo Qiang Yin ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Processing Method ◽  
Work Piece ◽  
Experiment Research ◽  
Micro Manufacturing ◽  
Roughness Model ◽  
Important Processing ◽  
Metal Materials ◽  
Intense Research

Micro-grinding is an important processing method in micro-manufacturing field. A series of micro-grinding experiments were done with several kinds of commonly used metal materials in the paper, and the influence of different grinding factors on the surface quality of the work-piece was discussed. The surface roughness and surface microstructure of each material were analyzed in micro-grinding. The general developmental law of the surface roughness in micro-grinding was got with different grinding parameters. The surface roughness model proposed by is accurately confirmed according to the experimental results. It provides significant results for the quality of micro-grinding and intense research for the development of micro-grinding.

Tribological Issues in the Tube Hydroforming Process—Selection of a Lubricant for Robust Process Conditions for an Automotive Structural Frame Part

2003 ◽  
Vol 125 (3) ◽  
pp. 484-492 ◽  
Author(s):  
Muammer Koc¸
Keyword(s):  
Process Design ◽  
Tube Hydroforming ◽  
Process Conditions ◽  
Process Selection ◽  
The Coefficient Of Friction ◽  
Hydroforming Process ◽  
Critical Regions ◽  
Robust Process ◽  
Lubricant Performance ◽  
Selection Of

In this paper, an overall review of tribological issues in the tube hydroforming process is presented. Guidelines for the selection of lubricants under the hydroforming process conditions are summarized following a description of existing testing methods and apparatus. A methodology of combined experiments and FEA was presented to determine the coefficient of friction in the hydroforming process in addition to selecting a proper lubricant for a given part and process design. Experimental results showed that thickness of the final part at critical regions, amount of axial feeding and axial force are strong indicators of lubricant performance whereas effect of lubrication on the part flatness, corner radius formation and box dimensions are found to be negligible.

Assortment of Hydroforming Fluid for Extreme Pressure and Anti Wear Properties

2019 ◽  
Author(s):  
S. P. Rudraksha ◽  
S. H. Gawande
Keyword(s):  
Tube Hydroforming ◽  
Vital Role ◽  
Test Method ◽  
Lubricating Oil ◽  
Experimental Investigations ◽  
Extreme Pressure ◽  
Wear Properties ◽  
Premature Failure ◽  
Hydroforming Process

Abstract Lubricants play vital role in tube hydroforming (THF) process to reduce friction between tool and die wall interface which helps to enhance the quality of finished product. The process parameters and quality of components is influence by the friction between the tube and inner surface of the die. Excellent lubricant reduces the problem of wrinkling, buckling and premature failure of the component. Extreme pressure, Anti-wear, and frictional properties of fluid influence the performance of tube hydroforming process. In this paper EP (extreme pressure), anti-wear and friction properties of hydroforming lubricating oils as Enklo68, Enklo46, Enklo32 and Enklo100 are investigated. Test method as per ASTM standards is used for the measurement of EP and wear preventive properties of hydroforming fluids by using Ball Tester TR – 30L under atmospheric pressure of lubricating oil at 392 N load and 75°C temperature with constant speed of 1770 rpm. From experimental investigations it is observed that as Enklo68 is more suitable hydroforming fluid as compared to Enklo46, Enklo32 and Enklo100 as its observed coefficient of friction (i.e. 0.10581) is very less.

Effect of Preform During Low Pressure Tube Hydroforming

2018 ◽  
Author(s):  
Ashley Trott ◽  
Chetan P. Nikhare
Keyword(s):  
Tube Hydroforming ◽  
Low Pressure ◽  
Pressure Tube ◽  
Fluid Medium ◽  
Die Geometry ◽  
Die Filling ◽  
Hydroforming Process ◽  
Plain Strain ◽  
Formed Part

Tube hydroforming is one of the manufacturing processes to produce lightweight components for automotive and aerospace industries. In this process a fluid medium is used to form a component either with high or low internal pressure. This process has gained popularity due to its many advantages such as part consolidation, quality of the formed part, and the possibility of unique shapes with indents or angles. In low-pressure tube hydroforming, the tube is marginally pressurized to a fixed volume during the closing of the die. Tube hydroforming can produce many geometric options which reduces the need for welding operations. The success of the tube hydroforming process is contingent on the ideal combination of material properties, process limitations, process sequence, and die geometry. The focus of this paper is to investigate the effect of preform on the low-pressure tube hydroforming in terms of pressure requirement, buckling and die filling. For this, a plain strain 2D model was created and hydroforming process was simulated. The tube was preformed to various widths and then hydroformed using low pressure. Two pressure conditions were simulated. The thickening of tube was observed which resulted in buckling of the tube. With higher pressure the buckling reduced but thickening of tube increased.

Polishing Process of Ceramic Tiles - Variation of Contact Pressure

2013 ◽  
Vol 769 ◽  
pp. 124-130 ◽  
Author(s):  
Anatolij Olenburg ◽  
Marcelo Reami Salati ◽  
Filipe Sant´Ana ◽  
Fabio Jose Pinhero Sousa
Keyword(s):  
Surface Roughness ◽  
Contact Pressure ◽  
Removal Rate ◽  
Cement Matrix ◽  
Work Piece ◽  
Abrasive Tool ◽  
Ceramic Tiles ◽  
Polishing Process ◽  
Measuring Machine

The contact pressure is one of the most important parameter in the industrial polishing process of ceramic tiles. The contact pressure is asically a function of the elasticity moduli of both tile and abrasive tool, the applied load, and also the curvature of the abrasive tool. Due to the wear, this curvature decreases during the polishing process, causing an increase in the contact pressure. The purpose of this work is to research the influence of contact pressure on the evolution of gloss and roughness of the polished ceramic tiles and to improve the quality of generated surface. The variation of curvature was replaced with the direct increment of three different normal forces onto the abrasive tool. It is known from literature that for fine abrasive grits higher tool loads increase gloss gain and decrease roughness. However, there are not many works that research the whole sequence of abrasives for different loads and compare the quality of the final surface. Polishing tests on a laboratory scale CNC-Tribometer have been used to study the industrial polishing process for unglazed porcelain ceramic tiles. Tests were carried out for three different tool loads with a sequence of progressively smaller silicon carbide abrasive particles embedded in a magnesia cement matrix. Tile surface quality was evaluated by roughness and optical gloss. The removed work piece material and the used abrasive were measured with a coordinate measuring machine. The distribution of gloss and roughness of the tile was measured before and during the experiments until a saturation of gloss and roughness for each grit number was achieved, respectively. The topography of the tile was measured before and after the polishing process with particularly grit number. The used abrasives show a general trend of increasing gloss and decreasing roughness during the process. The coarse abrasives caused the major effect on surface roughness and almost no effect on gloss. In opposite finer abrasives caused the major gloss enhancement and almost no effect on surface roughness. The results show the evolution of roughness and gloss for each load as a function of abrasive grit number and polishing time, as well as the material removal rate for each grit number and load.

scholarly journals PECULIARITIES IN SURFACE ROUGHNESS FORMATION AT ANODIC-MECHANICAL TREATMENT

2016 ◽  
Vol 2016 (3) ◽  
pp. 191-196 ◽  
Author(s):  
Андрей Бочаров ◽  
Andrey Bocharov ◽  
Виталий Иноземцев ◽  
Vitaliy Inozemtsev ◽  
Михаил Куликов ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Mechanical Treatment ◽  
Aluminum Surface ◽  
Work Piece ◽  
Geometrical Parameters ◽  
Considerable Influence ◽  
Large Share ◽  
High Quality ◽  
Considerable Part

The solution of problems belonging to assurance of high quality and accuracy of a surface at machining in mechanical engineering was always one of the primary and priority tasks. A considerable part of all technological operations connected with shaping falls at machining. At that the operations connected with milling occupy a rather large share of all processes of machining in a variety of production branches. In the course of the study of shaping and aspects of quality formation at machining it is established that anodicmechanical operation can promote effectively the quality increase of aluminum surface and its alloys at turning. Unlike turning at milling it is necessary to take into account other character of the interaction of a cutter with a surface worked and also the existence of some cutting edges which can contribute to the roughness growth at the macrolevel. A considerable influence upon quality of a surface under formation at aluminum alloy anodic milling have: materials of a work piece and a tool, technical and geometrical parameters of a tool, a milling direc-tion, scale formation, a magnitude of current and voltage in the area of a contact of a tool and a work piece, the availability and a type of cutting emulsion (or a mixture and concentration of electrolyte), and also a way of its feed.

Sign in / Sign up

Export Citation Format

Share Document