Research of New Splitting Process of Pipe Billets from 2618A Aluminium Alloy Basing on Cross-Wedge Rolling

2013 ◽  
Vol 58 (3) ◽  
pp. 725-729 ◽  
Author(s):  
A. Tofil
Keyword(s):  
Aluminium Alloy ◽  
Experimental Research ◽  
Cross Wedge Rolling ◽  
Bending Angle ◽  
Precise Analysis ◽  
Rolling Method ◽  
Material Separation ◽  
Forming Angle ◽  
Splitting Process

Abstract This paper are presented the results of theoretical and experimental research on splitting without waste of pipe billets from aluminium alloy realized basing on cross-wedge rolling method. The analyzed process is connected with rolling of a V-shape groove on a split billet circumference, and later with rotary bending causing material separation. In theoretical analysis, based on simulations by means of finite element method, basic models of metal cracking (brittle and ductile) were applied. During calculations, the following process parameters were changed: forming angle α, bending angle θ and reduction ratio ∆r. The achieved results allowed for a precise analysis of the splitting process within the scope of: state of strain, kinematics of flow, force parameters, state of stresses and type of cracking of the split material. On the basis of experimental research, the influence of the analyzed parameters on the surface of splitting was estimated and scope of parameters guaranteeing the assumed quality of the product was given. The comparison of theoretical and experimental results showed good conformity.

Study on the Regularity of the Center Quality of Cross Wedge Rolling Asymmetric Shaft Parts Based on Parity Wedge

2014 ◽  
Vol 488-489 ◽  
pp. 1125-1129
Author(s):  
Xue Dao Shu ◽  
Wen Ping Liu ◽  
Chao Cheng ◽  
Zhan Li ◽  
Wen Fei Peng ◽  
...  
Keyword(s):  
Systematic Study ◽  
Theoretical Foundation ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Study Results ◽  
Technology Applications ◽  
Forming Angle ◽  
Core Part ◽  
Rolling Technology

In order to expand cross wedge rolling technology applications further and improving the quality of asymmetric shaft parts, this paper predicts the position of center defect location of Cross Wedge Rolling asymmetric shaft parts based on Parity Wedge by Normalized C & L criteria. On this basis, it conducted a systematic study on the effect of forming angle on quality of rolling core part. It has found that, during the forming process of Cross Wedge Rolling shaft parts, rolling center region was more prone to damage, and achieved the regularity of process parameters on the quality of core part. The study results lay the theoretical foundation for preventing defects effectively and improving quality of rolling core part.

scholarly journals Spring-back effect during multi-pass bending of sheet blanks

2019 ◽  
Vol 135 ◽  
pp. 01066
Author(s):  
Volodymyr Kukhar ◽  
Mykyta Nahnibeda ◽  
Oleksii Radushev
Keyword(s):  
Experimental Research ◽  
Thickness Ratio ◽  
Basic Information ◽  
Spring Back ◽  
Bending Angle ◽  
The Difference ◽  
Geometric Quality ◽  
Back Angle ◽  
Number Of Passes

A significant factor, which leads to the discrepancy of the final sizes of the bent sheet parts to their drawings is the springing of the sheet blank during bending. At the same time, the springing during multi-pass bending is not sufficiently studied. The purpose of the work is to obtain the graphical and mathematical dependencies for descriptions of the resultative spring-back angle of the blanks at the multi-pass bending, taking into account the width of the blank, number of passes, and pre-bending angle at each preliminary pass. The paper describes the basic information about the difference between the spring-back angle for one-pass or multi-pass bending. In the course of the study it is shown that during calculations of forming and preventive prediction of the geometric quality of bending shapes it is necessary to take into account properties of the blank material, as well as the angles of the prebends and the width to thickness ratio of the blank. A methodology of experimental research was developed for determining the spring-back angle during multi-pass bending in three bending dies with 109°, 91° and 72° pass-by-pass reducing angles.

Effect of rolling parameters on forming quality of flat cross wedge rolling thread shafts

2020 ◽  
pp. 095440892095259 ◽  
Author(s):  
YiYu Shao ◽  
WenFei Peng ◽  
Xuan Yu ◽  
Moliar Oleksandr ◽  
Vyacheslav Titov
Keyword(s):  
Axial Force ◽  
Element Model ◽  
Helix Angle ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Forming Quality ◽  
Rolling Parameter ◽  
The Right ◽  
Forming Angle

The flat cross wedge rolling is an advanced forming process, which is used to produce thread shafts. In this work, a finite element model of flat cross wedge rolling thread shafts was established by the DEFORM-3D, and the effect of the forming angle, spreading angle, helix angle and flank angle on forming quality are investigated. The research results show that the forming angle, spreading angle, helix angle have a significant influence on the position of the die wedge-in point. The angle designed wrongly makes the die wedge-in point unable to be aligned correctly, causing defects such as slipping in the process, repeated rolling of formed thread, thin or incomplete tooth shapes. The flank angle mainly makes an impact on the axial force. Reducing the right flank angle or increasing the left flank angle can effectively improve the imbalance of axial force to obtain high-quality thread shafts. Through the experiment of flat cross wedge rolling thread shafts, the data comparison demonstrates that the error of the external dimension of formed parts is small, proving the reliability of the rolling parameter selection.

scholarly journals Analysis of Instructional Video Developed for Z Generation at Basic Speaking Class

2019 ◽  
Vol 10 (2) ◽  
pp. 269
Author(s):  
Sri Fatmaning Hartatik ◽  
Ike Dian Puspitasari
Keyword(s):  
Content Analysis ◽  
Experimental Research ◽  
English Teachers ◽  
Instructional Video ◽  
Precise Analysis ◽  
Scoring Rubric ◽  
Speak Up ◽  
Teaching Video

This content analysis was intended to analyze the physical and cognitive designs of a teaching video for Basic Speaking course developed for Z generation at IKIP Budi Utomo Malang. In order to get precise analysis, the researchers involved four English teachers, who teach Basic Speaking, to observe and score the video. To get objective scores, the four teachers were requested to use scoring rubric assessment adapted from (Morain and Swarts, 2012 in Tolentino 2016:109); besides they were also asked to give additional comments on the quality of the video. After the scores and comments were gathered and interpreted, it can be noticed that the video entitled “Dare to Speak Up” was categorized as a good video. Therefore, those who teach Speaking for beginners are suggested to use this video as one of learning sources. Even though the video was declared to be good, its effectiveness still remained unanswered. Accordingly, further researchers are motivated to do an experimental research to measure the effectiveness of the video.

Influence Rules of Technological Parameters on End Quality in Closed Cross Wedge Rolling (CWR)

2015 ◽  
Vol 1095 ◽  
pp. 756-761 ◽  
Author(s):  
Chuan Liu ◽  
Chang Shu ◽  
Cheng Chao ◽  
Bao Shou Sun
Keyword(s):  
Theoretical Foundation ◽  
Technological Parameters ◽  
Cross Wedge Rolling ◽  
Finite Element Software ◽  
Closed Type ◽  
Simulation Calculation ◽  
Reduction Of Area ◽  
Forming Angle ◽  
Deform 3D

In order to raise the efficience of materials' utilization and realize the CWR without the stub bar, this paper will focus on the closed CWR forming shafts,applying finite element software DEFORM-3D to do numerical simulation calculation for the process and studying the end quality of shafts.This paper has obtained the influence rule of the forming angle α, broadening angle β, reduction of area ψ and billet diameter D four process parameters on the end quality of the closed type CWR .The research results has showed that the length of concavity goes up along with the forming angle decrease;the same as the broadening angle; while the length of concavity goes up along with the billet diameter increase.and the reduction of area ψ has made a vital influence on the end quality of shafts,this conclusion has made a solid theoretical foundation and referential value for closed CWR .

scholarly journals The Effect of Recitation Method on Learning Outcomes of “Life Events” of 5th Grade

2021 ◽  
Vol 2 (1) ◽  
pp. 29-35
Author(s):  
Muhammad Ilyas Habibulloh ◽  
Muhammad Nuruddin
Keyword(s):  
Learning Outcomes ◽  
Life Events ◽  
Experimental Research ◽  
Learning Process ◽  
Quality Of Education ◽  
Student Interest ◽  
The Right ◽  
5Th Grade ◽  
Academic Year

This study aims as a way to determine the effect of the recitation method on learning outcomes of events in life that focuses on sub-theme 2 national events about the proclamation of independence day at SDN Gongseng 1 Jombang. As we know that the average learning process in schools is still centered on the teacher himself. By using the right application, it is certain that it will have a good impact on the quality of education. The lack of student interest in the methods taught by the teacher had a significant impact. In the process of working on questions, for example, students are less able to understand what is conveyed by the teacher who is able to provide a learning process whose substance is carried out by selecting the appropriate method. This research is pre-experimental research design, in the form of one-group pretest-posttest. The sample of this study consisted of 9 boys and 10 girls totaling 19 students who were in the experimental class. In the academic year 2021, it can be seen that the results of the pretest and posttest data of students by using the recitation method have sig. 0.000 < 0.05. From these results, it can be concluded that the effect of recitation has an influence on classroom learning by using conventional methods.

scholarly journals Pengaruh Volume Minyak Sumbawa Sebagai Antibakteri dalam Pembuatan Sabun Mandi Cair

2020 ◽  
Vol 8 (2) ◽  
pp. 97
Author(s):  
Muhamad Zaenudin ◽  
Ahmadi Ahmadi ◽  
Hulyadi Hulyadi
Keyword(s):  
Experimental Research ◽  
Daily Life ◽  
Antibacterial Properties ◽  
Inhibition Zone ◽  
Liquid Bath ◽  
Staphyloccocus Aureus ◽  
Bacteria And Fungi

Soap is a necessity for daily life, such as for bathing, washing, and cleaning other necessities. Normally various kinds of bacteria and fungi can live permanently on the skin, for example, such as thebacteria Staphyloccocus aureus. Antibacterial soap is used as a solution to this bacterial problem. Sumbawa oil is a natural ingredient that has the potential to be antibacterial in body wash. Sumbawa oil contains geraniol and citronellal, flavonoids, polyphenols and also contains saponins and tannins. The research objective was to find out what volume of Sumbawa oil is used to obtain the quality of liquid bath soap which has antibacterial content and meets SNI standards. This research is an experimental research in a laboratory by varying the volume of Sumbawa oil. The parameters measured in this study were the effect of variations in the volume of Sumbawa oil on antibacterial properties and pH of liquid bath soap. The findings in this study that the best antibacterial properties were found in the addition of 15 ml volume of Sumbawa oil with an average inhibition zone of 19.5-22.3 mm and a pH of 5 ml of Sumbawa oil volume with an average pH of 6.1. Based on the above findings, it can be concluded that the addition of Sumbawa oil has an effect on the antibacterial properties and pH of liquid bath soap. 

scholarly journals Quality control of aluminium melt in production process

2016 ◽  
Vol 61 (Special Issue) ◽  
pp. S43-S47 ◽  
Author(s):  
M. Kotus ◽  
E. Jankajová ◽  
M. Petrík
Keyword(s):  
Quality Control ◽  
Chemical Composition ◽  
Production Process ◽  
Aluminium Alloy ◽  
Technological Process ◽  
Casting Alloy

The quality of aluminium alloy in the production process on the chemical composition basis was evaluated. The quality of casting alloy depends on the chemical composition of melt and on the technological process of production process. The basic elements such as Si, Cu, Fe, Mg and Al in melting were evaluated. The obtained data were compared with the guide data referred to in the standard for aluminium alloy.

scholarly journals Experimental Research into Technology of Abrasive Flow Machining Nonlinear Tube Runner

2014 ◽  
Vol 6 ◽  
pp. 752353 ◽  
Author(s):  
Junye Li ◽  
Lifeng Yang ◽  
Weina Liu ◽  
Xuechen Zhang ◽  
Fengyu Sun
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Quality ◽  
Experimental Research ◽  
The Self ◽  
Technological Parameters ◽  
Abrasive Flow Machining ◽  
Overall Performance ◽  
Scanning Electron

In the fields of military and civil uses, some special passages exist in many major parts, such as non-linear tubes. The overall performance is usually decided by the surface quality. Abrasive flow machining (AFM) technology can effectively improve the surface quality of the parts. In order to discuss the mechanism and technology of abrasive flow machining nonlinear tube, the nozzle is picked up as the researching object, and the self-designed polishing liquid is employed to make research on the key technological parameters of abrasive flow machining linear tube. Technological parameters’ impact on surface quality of the parts through the nozzle surface topography and scanning electron microscopy (SEM) map is explored. It is experimentally confirmed that abrasive flow machining can significantly improve surface quality of nonlinear runner, and experimental results can provide technical reference to optimizing study of abrasive flow machining theory.

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