Effect of lubricant fluid on plastic metal flow in sliding contact

Wear ◽  
1985 ◽  
Vol 101 (2) ◽  
pp. 155-168
Author(s):  
Tokio Morimoto ◽  
Kentaro Tamamura
Keyword(s):  
Metal Flow ◽  
Sliding Contact ◽  
Plastic Metal

Analysis of Metal Flow of Aluminum through Long Choked Die Channels

2009 ◽  
Vol 424 ◽  
pp. 145-152 ◽  
Author(s):  
Henry Sigvart Valberg
Keyword(s):  
Cross Section ◽  
Channel Wall ◽  
Metal Flow ◽  
Extrusion Process ◽  
Sliding Contact ◽  
Aluminum Extrusion ◽  
Grid Pattern ◽  
Contact Conditions ◽  
New Knowledge ◽  
Flow Through

The mechanics of metal flow through long choked die channels have been investigated in unlubricated hot aluminum extrusion. Experiments were performed in a laboratory press at an earlier occasion by letting a grid pattern introduced into the billet flow down into the choked die channel to appear adjacent to the channel wall. The grid pattern was then revealed to characterize the metal flow in the channel. A 2D-model of the extrusion process was made. The model was applied to study the conditions in the extrusion experiments and in this model good similarity was obtained with the experiment. New knowledge regarding the metal flow through a choked die channel have been obtained this way, such as; contact conditions, presence of sticking and sliding zones, friction conditions in the sliding contact zone and the velocity profile over the cross-section of the channel.

scholarly journals The Preliminary Exploration of Micro-Friction Stir Welding Process and Material Flow of Copper and Brass Ultra-Thin Sheets

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2401
Author(s):  
Changqing Zhang ◽  
Zhuo Qin ◽  
Chen Rong ◽  
Wenchen Shi ◽  
Shuwen Wang
Keyword(s):  
Friction Stir Welding ◽  
Flow Behavior ◽  
Pure Copper ◽  
Weld Zone ◽  
Metal Flow ◽  
Welding Process ◽  
Process Conditions ◽  
Friction Stir ◽  
Plastic Metal ◽  
Tool Pin

In the friction stir welding (FSW) of ultra-thin dissimilar metal sheets, different physical material properties, the reduction of plastic metal in the weld zone, and insufficient plastic metal flow lead to poor weld seam shapes and joint qualities. Therefore, it is necessary to study the flow behavior during the FSW of ultrathin sheets. In this study, micro friction stir welding (μFSW) was conducted and analyzed for the butt welding of 0.6-mm-thick ultrathin brass (H62-H) and pure copper (T2-Y) sheets. By analyzing the electric signals of the temperature and force during the welding process, testing the mechanical properties, and analyzing the metallography of the joint, the influences of the process parameters on the metal flow behavior during μFSW were studied. In the proper process conditions, the material preferentially migrated and concentric vortex flow occurred in the vicinity of the shoulder and tool pin action areas. The copper was pushed from the retreating side (RS) to the advancing side (AS) of the weld, allowing it to flow more fully. A mixture of both materials formed at the bottom of the weld nugget, and less migration occurred in the heat-affected zone of the AS at this time. The highest tensile strength can reach 194 MPa, accounting for 82.6% of the copper. The presence of brittle phases Cu5Zn8, AgZn3 and AgZn caused the hardness to fluctuate slightly.

scholarly journals Analysis of inheritance mechanisms in animate nature and engineering

2020 ◽  
Vol 2020 (11) ◽  
pp. 16-29
Author(s):  
Andrey Krechetov ◽  
Valeriy Blyumenstein ◽  
Ludmila Zakonnova
Keyword(s):  
Surface Layer ◽  
Metal Flow ◽  
Deformation Source ◽  
Scientific Investigation ◽  
Engineering Process ◽  
Scientific Investigations ◽  
Technological Inheritance ◽  
Engineering Technique ◽  
Plastic Metal ◽  
Evolution Of Ideas

The evolution of ideas on inheritance is analyzed and basic types of inheritance in animate nature are presented. Reasoning from the analysis of terms adopted in genetics and engineering technique there is carried out the analysis of inheritance mechanisms at machining and machinery operation. There is shown the evolution of ideas on hereditary information: first the part manufactured the accuracy dimensions of which were “copied” (inherited) in the course of engineering procedure; further – a thin surface layer formed during the engineering process and within the frames of the scientific investigation carried out – material of the deformation source where a plastic metal flow takes place. An analysis is carried out and the directions of the development of scientific investigations in the field of technological inheritance are presented.

scholarly journals Calculation of the Plastic Metal Flow in the Cold Extrusion Technology by Finite Volume Method

2020 ◽  
Vol 14 (4) ◽  
pp. 493-498
Author(s):  
Hazim Bašić ◽  
Ismet Demirdžić ◽  
Samir Muzaferija
Keyword(s):  
Finite Volume Method ◽  
Finite Volume ◽  
Control Volume ◽  
Metal Flow ◽  
Momentum Balance ◽  
Cold Extrusion ◽  
Governing Equations ◽  
Plastic Metal ◽  
Volume Method ◽  
Extrusion Technology

This paper presents an application of the finite volume method to ideal plastic metal flow in extrusion technology. Governing equations for the mass and momentum balance are used in an integral form. Solution domains in the cases considered are discretized with a Cartesian numerical mesh with computational points placed at the center of each control volume. After discretization of the governing equations, the resulting system of nonlinear algebraic equations is solved by an iterative procedure, using a segregated algorithm approach. Resulting stress fields are obtained from the Levy-Mises equations. The experimental results and numerical calculations are in good agreement.

Study of the process of forming a hole for a thread at manufacturing a high nut

2020 ◽  
Vol 76 (8) ◽  
pp. 841-846
Author(s):  
I. G. Shubin ◽  
A. A. Kurkin
Keyword(s):  
Metal Flow ◽  
Nonlinear Dependence ◽  
Geometrical Parameters ◽  
Relative Height ◽  
Forming Process ◽  
Normal Height ◽  
Accuracy Class ◽  
Limit Values ◽  
Program Complex ◽  
Class B

During manufacturing nuts of increased height, a problem of obtaining correct cylindrical form of the hole for thread and overall geometrical parameters arises. To solve the problem it is necessary to know regularity of the blank forming process. Results of the study of a technological process of high hexahedral nuts forming presented. The nuts were M18 of 22 mm height, M16 of 19 mm height and M12 of normal height 10 mm according to GOST 5915–70, accuracy class B, steel grade 10 according to GOST 10702–78. The volumetric stamping was accomplished at the five-position automatic presses of АА1822 type. It was determined, that unevenness of the metal flow in the process of plastic deformation of blanks of increased height nuts was caused by different stress conditions by their sections. To simulate the mode of deformation, the program complex QForm-3D was chosen. The complex ensured to forecast with necessary accuracy the metal flow in a blank, as well as to define the deformation force and arising stress in the working instrument. The simulation showed the presence of regularity between preliminary formed buffle and deviation of dimensions and form of a blank wall after its finishing piercing, which can be expressed by a nonlinear dependence. The limit values of the relative height of the buffle С/D = 0.56–0.588 defined, exceeding which will result in rejection of the finished product. Accounting the limit values of the relative height of the buffle will enable to correct a mode of technological operations and technological instruments at stamping of high hexahedral nuts.

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