Analysis of the Surface Roughness of a Tube Drawn by a Fixed Mandrel

2020 ◽  
Vol 994 ◽  
pp. 70-77 ◽  
Author(s):  
Augustín Görög ◽  
Ingrid Görögová ◽  
Maroš Martinkovič
Keyword(s):  
Surface Roughness ◽  
Experimental Research ◽  
Surface Finish ◽  
Small Diameter ◽  
Internal Diameter ◽  
Tube Drawing ◽  
Inner Surface ◽  
Spiral Grooves ◽  
Drawing Method

The manufacture of tubes by a fixed mandrel drawing is one of the technologies in the manufacture of seamless tubes. This is the oldest tube drawing method. It uses a mandrel at the end of the die to shape the internal diameter of the tube. This process is slow and the area reductions are limited (lengths of tubes are limited), but it gives the best inner surface finish of any of the processes. The use of a fixed mandrel by the drawing of small-diameter tubes makes it possible to increase the accuracy of the inner surface and improve the quality. The paper presents the results of solving a partial task in this area. It deals with the reconstruction of the microgeometry of the inner surface of a tube drawn by a fixed mandrel. Tubes (STN 41 1353) were drawn through dies with different reduction angles. There were grounds the straight and spiral grooves on used fixed mandrels. On the inner surface of the tube were formed grooves after drawn that had a different surface roughness compared to the mandrel surface. The paper graphically presents the morphology of obtained surfaces under various conditions (reduction angles, straight/spiral grooves on the fixed mandrel) as well as measured surface roughness values. At the end of the paper, the knowledge gained through experimental research are summarized.

scholarly journals Experimental research of static-impulse deformative drawing

2016 ◽  
Vol 1 (1) ◽  
pp. 38-42
Author(s):  
Д. Соловьёв ◽  
D. Solovev ◽  
А. Киричек ◽  
A. Kirichek ◽  
М. Медведев ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Experimental Research ◽  
Energy Intensity ◽  
Static Load ◽  
Small Diameter ◽  
Partial Replacement ◽  
Impulse Loading ◽  
Experimental Complex ◽  
Machine Parts ◽  
High Depth

The new method of deformative strengthening of holes using combined static and impulse loading is presented. Partial replacement of static load, used in classical burnishing, by impact impulses allows decreasing energy intensity of strengthening process and expanding the technological capabilities of the method. The method allows strengthening of small diameter and long length holes. The high depth and degree of strengthening can be obtained; the surface roughness can be decreased. The experimental complex for research of static-impulse parameters of deformative drawing of holes of machine parts, which allows determining the influence of energy parameters of the process taking into account stiffness of technological system on roughness, depth and degree of strengthening of holes surfaces, is developed.

Study on Wall Heights and Surface Roughness of Spun Cups Produced of Metal Blanks by Multipass CNC Spinning Technology

2019 ◽  
Vol 952 ◽  
pp. 55-65
Author(s):  
Martin Frnčík ◽  
Jana Šugárová ◽  
Peter Šugár ◽  
Ingrid Görögová ◽  
Martin Sahul
Keyword(s):  
Experimental Study ◽  
Surface Roughness ◽  
Experimental Research ◽  
Surface Finish ◽  
Design Of Experiment ◽  
Rotational Speed ◽  
Tool Path ◽  
Rolling Direction ◽  
Metal Spinning ◽  
Full Factorial

This research paper deals with the influence analysis of the conventional metal spinning parameters (tool path profile tpp, tool feed f and mandrel rotational speed n) on the wall heights and the surface roughness Ra of the cylindrical-shaped spun parts measured in various directions with respect to the material rolling direction. Experimental research was carried out according to the 3-level full factorial design of experiment (DoE). Experimental study was also statistically analyzed by the ANOVA method. It was observed that tool path profile is a process parameter which has the most significant impact on the spun cup height and the surface finish, as well.

Study on Abrasive Flow Machining Pipe Inner Surface

2011 ◽  
Vol 332-334 ◽  
pp. 2014-2017
Author(s):  
Li Sheng Wu ◽  
Ji Yuan Zhang
Keyword(s):  
Surface Roughness ◽  
Surface Defects ◽  
Small Diameter ◽  
Abrasive Flow Machining ◽  
Inner Surface

For it is difficult to machining inner surface of small diameter pipes, abrasive flow machine (AFM) had been tested to polish the inner surface. Pipe inner surface AFM experiment and AFM defects remove experiment were carried out on MB9211 AFM machine, and conclusions were obtained that AMF is a very effective process to polish pipe inner surface, roughness significantly reduce after processing and can remove certain surface defects.

Study on Aerostatic Guidance

Tribology ◽  
2006 ◽  
Author(s):  
Peng Zhao ◽  
Tadaatsu Satomi ◽  
Tadashi Nakazawa
Keyword(s):  
Boundary Layer ◽  
Surface Roughness ◽  
Boundary Layer Flow ◽  
Small Diameter ◽  
Positioning Precision ◽  
Experimental Apparatus ◽  
Inner Surface ◽  
Static Rigidity ◽  
Measuring Machine ◽  
Layer Flow

The aerostatic guidance is used as a super precision positioning device in the fields of semiconductor production and measurement machine, and its performance is expected to be improved. Although the study on the small guidance clearance region by which the high positioning precision may be expected is very important, there is almost no research papers published in this area to date. The purpose of this study is to enhance the calculation accuracy in the region of which the guidance clearance is comparatively small in the aerostatic guidance design. This is accomplished by considering the influence of the cutting surface roughness upon the air flow. More specifically, the amount of air flux passing through the orifice which is principal constituent of an aerostatic guidance is calculated in two separated parts. One part is the calculation done on the boundary layer flow whereas the other part on the potential flow. In this case, the calculation of the boundary layer flow is attempted using a theory in which the surface roughness is taken into account. That is, the calculation is done based on a virtual cylinder which has the same area as that of the rough inner surface of the orifice calculated based on the measured result of the surface roughness of an orifice cut surface. The truth inner surface area is calculated from the inspection result of the inner surface roughness measured by using a 3D surface roughness measuring machine. Through this method, the velocity distribution in the boundary layer is made clear where the diameter of the orifice is comparatively small, and a technique for calculating intrarubular flow is newly established. In addition, experimental apparatus to evaluate this theoretical calculation were designed and produced to confirm the flow characteristics and the load characteristic of the squeeze structure used in this study. As a result, the boundary layer velocity in the small diameter orifice which plays an important role in obtaining a high static rigidity and the pressure of the downstream side of the orifice can be calculated with precision. Thus, an attempt is made to improve the calculation precision of static rigidity in the small guidance clearance region where a high positioning precision can be expected. All of these calculation results are in a fairly good agreement with the experimental results.

Prediction and Investigation of Surface Quality in High Speed End-Milling of Silicon to Eliminate Conventional Finishing Operations

2011 ◽  
Vol 418-420 ◽  
pp. 1237-1241
Author(s):  
A.K.M. Nurul Amin ◽  
Mohd Dali M Ismail ◽  
Muhammad Iqbal Musa ◽  
Anayet Ullah Patwari
Keyword(s):  
Surface Roughness ◽  
Surface Finish ◽  
High Speed ◽  
End Milling ◽  
High Surface ◽  
Small Diameter ◽  
Dimensional Accuracy ◽  
Cutting Parameters ◽  
Machining Process ◽  
Dry Cutting

Surface finish and dimensional accuracy are two of the most important requirements in machining process. High speed machining (HSM) is capable of producing parts that require little or no grinding/lapping operations within the required machining tolerances. In HSM determination of the optimum combination of cutting parameters for achieving the required level of quality, such as, minimum possible surface roughness and maximum tool life is a very important task. Silicon is conventionally finished using grinding followed by polishing and lapping to achieve required surface finish and surface integrity. In this study small diameter tools are used to achieve high rpm to facilitate the application of low values of feed and depths of cut to ensure high surface roughness values through achievement of ductile mode machining of silicon. Investigations on the effect cutting parameters of high speed end milling on surface finish and integrity of silicon has been conducted to minimizing the amount of finishing requirement in machining of silicon, with the objective of reducing cost and increasing effectiveness of silicon manufacturing process. In this work statistical models were developed using the capabilities of Response Surface Methodology (RSM) to predict the surface roughness in high speed flat end milling of silicon under dry cutting conditions.

Effects of Insert Nose Radius and Processing Cutting Parameter on the Surface Roughness of Aisi 316 Stainless Steel

2010 ◽  
Vol 447-448 ◽  
pp. 51-54
Author(s):  
Mohd Fazuri Abdullah ◽  
Muhammad Ilman Hakimi Chua Abdullah ◽  
Abu Bakar Sulong ◽  
Jaharah A. Ghani
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Surface Finish ◽  
Feed Rate ◽  
Cutting Speed ◽  
Chip Thickness ◽  
Cutting Parameters ◽  
Depth Of Cut ◽  
Nose Radius ◽  
Aisi 316

The effects of different cutting parameters, insert nose radius, cutting speed and feed rates on the surface quality of the stainless steel to be use in medical application. Stainless steel AISI 316 had been machined with three different nose radiuses (0.4 mm 0.8 mm, and 1.2mm), three different cutting speeds (100, 130, 170 m/min) and feed rates (0.1, 0.125, 0.16 mm/rev) while depth of cut keep constant at (0.4 mm). It is seen that the insert nose radius, feed rates, and cutting speed have different effect on the surface roughness. The minimum average surface roughness (0.225µm) has been measured using the nose radius insert (1.2 mm) at lowest feed rate (0.1 mm/rev). The highest surface roughness (1.838µm) has been measured with nose radius insert (0.4 mm) at highest feed rate (0.16 mm/rev). The analysis of ANOVA showed the cutting speed is not dominant in processing for the fine surface finish compared with feed rate and nose radius. Conclusion, surface roughness is decreasing with decreasing of the feed rate. High nose radius produce better surface finish than small nose radius because of the maximum uncut chip thickness decreases with increase of nose radius.

Improved Method Based on Fluid Mechanics Analysis for Buoy Gauge Design and Experimental Research

2012 ◽  
Vol 163 ◽  
pp. 133-137
Author(s):  
Ao Yu Chen ◽  
Xu Dong Pan ◽  
Guang Lin Wang
Keyword(s):  
Fluid Mechanics ◽  
Experimental Research ◽  
Traditional Method ◽  
New Method ◽  
Improved Method ◽  
Advanced Method ◽  
Inner Surface ◽  
Mechanics Analysis ◽  
Linear Property

Traditional method of buoy gauge design is rather complicated, so an advanced method by building and solving fluid mechanics equations is proposed in this paper. The curve of the taper pipe inner surface is calculated, according to different buoy gravity and diameter. In order to examine the effect of this improved method, an experiment is carried out. Results show that linear property of the buoy gauge improved by new method is excellent.

Deep Hole Machining with a Small Diameter Drill and Ultrasonic Vibration

2017 ◽  
Vol 749 ◽  
pp. 107-110
Author(s):  
Yuta Masu ◽  
Tomohito Fukao ◽  
Taiga Yasuki ◽  
Masahiro Hagino ◽  
Takashi Inoue
Keyword(s):  
Surface Roughness ◽  
Ultrasonic Vibration ◽  
Cutting Tool ◽  
Cutting Speed ◽  
Small Diameter ◽  
Maximum Amplitude ◽  
Depth Of Cut ◽  
Deep Hole ◽  
Work Material ◽  
Finished Surface

The method of imparting ultrasonic vibration to the cutting tool is known to improve the shape accuracy and finished surface roughness. However, a uniform evaluation of this function in drilling has not been achieved, and the cutting process cannot be checked from the outside. The aim of this study is to investigate the cutting characteristics in deep hole drilling when an ultrasonic vibrator on the table of a machining center provides vibration with a frequency of 20 kHz to the work piece. The ultrasonic vibrations in this system reach the maximum amplitude in the center of the work material. We evaluated the change in finished surface roughness between the section where drilling starts to the point of maximum amplitude with ultrasonic vibration. The main cutting conditions are as follows: cutting speed (V) 12.6 (mm/min); feed rate (s) 30, 60 (mm/rev); depth of cut (t) = 32 (mm); work material, tool steel; cutting tool material, HSS; point angle (σ) 118 (°); and drill diameter (φ) 4 (mm). Lubricant powder was also added to clarify the cutting effect, and compared the condition in which there was no ultrasonic vibration. The results showed that surface roughness at the point of maximum amplitude was better than that with no vibration.

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