HOLLOW CYLINDER BILLET WITH AN INTERNAL PROTRUSION RADIAL PRESSING

2020 ◽  
Vol 4 (2) ◽  
pp. 78-84
Author(s):  
E.O. RESCHIKOV
Keyword(s):  
Plastic Flow ◽  
Hollow Cylinder ◽  
Theoretical Study ◽  
High Accuracy ◽  
Material Consumption ◽  
Technological Parameters ◽  
Alternative Technology ◽  
Study Results ◽  
Work Samples ◽  
Theory Of Plastic Flow

Hollow tubular products with an internal protrusion have certain difficulties in production. Machinig such blanks leads to increased material consumption, a decrease of parts operational properties. The alternative technology of internal radical extrusion is proposed. Using the theory of plastic flow according to the method of A. L. Vorontsov, the formulas necessary for calculating the technological parameters of the process are obtained. Reliable verification of the theoretical study results is possible by experiment performing. In the present work samples made of lead were extruded. The deforming force was determined and the results were compared to the values obtained theoretically. The effect of friction to the force value was evaluated. The high accuracy of the calculations has been experimentally confirmed.

Research of stamping of unequal channel bars. Part 3. Force parameters and shape change of the billet when extruding channels. 1. Kinematic and stress states of the billet

2021 ◽  
pp. 65-71
Author(s):  
A.L. Vorontsov
Keyword(s):  
Plastic Flow ◽  
Complete System ◽  
Shape Change ◽  
Plane Deformation ◽  
System Of Equations ◽  
Flow Rates ◽  
Die Forging ◽  
The Matrix ◽  
Stress States ◽  
Theory Of Plastic Flow

On the basis of the complete system of equations of the theory of plastic flow, the kinematic and stress states of the billet are determined when the channels are extruded under conditions of plane deformation of the misaligned position of the punch and the matrix. Keywords: die forging, extrusion, misaligned position, punch, matrix, plane deformation, plastic flow rates, stresses. [email protected]

Research of stamping of unequal channel bars. Part 3. Force parameters and shape change of the billet when extruding channels. 2. Determination of the extrusion force, maximum pressure on the matrix wall and the heights of the walls, taking into account the elastic deformation jf the matrix

2021 ◽  
pp. 63-69
Author(s):  
A.L. Vorontsov
Keyword(s):  
Plastic Flow ◽  
Elastic Deformation ◽  
Shape Change ◽  
Plane Deformation ◽  
Maximum Pressure ◽  
Extrusion Force ◽  
System Of Equations ◽  
The Matrix ◽  
Theory Of Plastic Flow

On the basis of the system of equations of the theory of plastic flow, the forces, the maximum pressure on the wall of the matrix and the heights of the obtained walls when extruding channels are determined, taking into account the elastic deformation of the matrix. Keywords: die forging, extrusion, misalignment, punch, matrix, plane deformation, stresses. [email protected]

scholarly journals Examining the Accuracy of Network RTK and Long Base RTK Methods with Repetitive Measurements

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Tamer Baybura ◽  
İbrahim Tiryakioğlu ◽  
Mehmet Ali Uğur ◽  
Halil İbrahim Solak ◽  
Şeyma Şafak
Keyword(s):  
Real Time ◽  
Precise Point Positioning ◽  
High Accuracy ◽  
Base Station ◽  
Network Rtk ◽  
Real Time Kinematic ◽  
Study Results ◽  
Point Positioning

Real-time kinematic (RTK) technique is important for mapping applications requiring short measure time, the distance between rover and base station, and high accuracy. There are several RTK methods used today such as the traditional RTK, long base RTK (LBRTK), network RTK (NRTK), and precise point positioning RTK (PPP-RTK). NRTK and LBRTK are popular with the advantage of the distance, the time, and accuracy. In the present study, the NRTK and LBRTK measurements were compared in terms of accuracy and distance in a test network with 6 sites that was established between 5 and 60 km. Repetitive NRTK and LBRTK measurements were performed on 6 different days in 2015-2017-2018 and additionally 4 campaigns of repetitive static measurements were carried out in this test network. The results of NRTK and LBRTK methods were examined and compared with all relevant aspects by considering the results of the static measurements as real coordinates. The study results showed that the LBRTK and NRTK methods yielded similar results at base lengths up to 40 km with the differences less than 3 cm horizontally and 4 cm vertically.

Applied-Information Technology in Willingness of Online Group Buying for College Students

2014 ◽  
Vol 685 ◽  
pp. 540-544
Author(s):  
Xiao Ting Li ◽  
Lin Zhong ◽  
Shou Wen Ji
Keyword(s):  
College Students ◽  
College Student ◽  
Theoretical Study ◽  
Influence Factors ◽  
Reference Value ◽  
Group Buying ◽  
Study Results ◽  
Management Recommendations ◽  
Online Group ◽  
Operation And Management

As a new e-commerce model, network group purchase develops rapidly for its advantages such as conservation and convenience. The college student is an important part of consumer of the online group buying, so the research on college student willingness has a important reference value for the expansion of market. Firstly, the article has a theoretical study on the influence factors of willingness of Online Group Buying for college students and carries out related questionnaires. Secondly, the article makes factor analysis, correlation analysis, multiple regression analysis using the statistical software of SPSS19.0. Finally, this paper proposes corresponding operation and management recommendations for relevant participants in online group-buying according to the study results.

scholarly journals A new theory of plastic flow

1949 ◽  
Vol 7 (2) ◽  
pp. 201-211 ◽  
Author(s):  
D. Trifan
Keyword(s):  
Plastic Flow ◽  
Theory Of Plastic Flow

Measuring the Success of Social Software Adoption in the Firm

2012 ◽  
Vol 2 (2) ◽  
pp. 34-47 ◽  
Author(s):  
Melanie Steinhüser ◽  
Stefan Smolnik ◽  
Uwe Hoppe
Keyword(s):  
Theoretical Study ◽  
Social Aspects ◽  
Social Software ◽  
Is Success ◽  
Software Adoption ◽  
The People ◽  
Study Results ◽  
Multiple Case ◽  
Theoretic Foundations

Recently, the use of social software has gained enormous popularity in many organizations. However, despite its development from a trend topic to a well established technology, there is little theoretical study on how to measure the success of this kind of information system. Allowing for the unique characteristics of social software, the author assumes that existing IS success models are not applicable to social software without modifications. Therefore, this article aims to develop a model for measuring social software success, which is based on theoretic foundations and the findings of a multiple case study. Results show that existing models are not able to represent all dimensions which are relevant in this context. Especially social aspects related to the organization and the people within have to be taken into account.

Sign in / Sign up

Export Citation Format

Share Document