The Verification of Material Plastic Flow at Optimal Warm Forging Temperature Using Computer Simulation

2013 ◽  
Vol 421 ◽  
pp. 229-234
Author(s):  
Maria Kapustova
Keyword(s):  
Plastic Flow ◽  
Cold Forging ◽  
Case Hardening ◽  
Numeric Simulation ◽  
Technological Test ◽  
Reduction Of Area ◽  
Warm Forging ◽  
The Given ◽  
Is Value ◽  
Main Factor

Warm forging is most commonly used for production of die forgings which are manufactured by means of precise forging. As compared to cold forging, warm forging enables to reduce forging forces size considerably. Development of warm forging technology is connected to formability and plasticity research of forged material at warm temperatures. This contribution brings a methodology for optimal forging temperature determination from recommended interval of warm temperatures used for chromium-manganic steel 16MnCr5. The given steel is appropriate for case hardening and precise die forgings production. For the purpose of verification of steel forgeability at the recommended interval of warm forging temperatures 600, 650, 700 and 750 °C technological test of upsetting according to Zidek is used. The main factor of plasticity for optimal warm temperature selection from examined temperature interval is value of reduction of area that was determined by tensile test. Numeric simulation of forging process in closed die confirmed correct plastic flow of steel 16MnCr5 at recommended forging temperature 700 degrees of Celsius.

The Research of Forgeability for Warm Temperatures Using Simulation

2013 ◽  
Vol 749 ◽  
pp. 18-22
Author(s):  
Maria Kapustova ◽  
Marek Zvončan
Keyword(s):  
Numerical Simulation ◽  
Surface Quality ◽  
Temperature Interval ◽  
Case Hardening ◽  
Steel Alloy ◽  
Warm Temperature ◽  
Practical Test ◽  
Technological Test ◽  
Warm Forging ◽  
The Given

At nowadays the interest of forging shops is focused on technology of accurate die warm forging. It is possible to reach higher exploitation of material, higher surface quality and higher accuracy of forgings in comparison to standard forging. The advance of warm forging relates to research of ductility and plasticity of forged material in warm temperature range. This paper provides the results of the research of 16MnCr5 steel forgeability in the interval of temperatures of warm forging. Steel alloy 16MnCr5 is proper for case hardening and for the production of precision die forging. In this paper the description of methodology for the proper interval setting of temperatures of warm forging for the given type of steel can be found. Practical test and a numerical simulation has proven the propriety of the examined steel for forging in the temperature interval 600, 650, 700 and 750 °C. For the steel forgeability verification in the recommended interval of warm forging temperatures, the technological test of upsetting according to Zidek was used.

MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 13. DETERMINATION OF DEFORMED STATE UNDER STRAITENED EXTRUSION IN FOURTH CENTRAL AREA OF PLASTIC DEFORMATION

2020 ◽  
Vol 0 (4) ◽  
pp. 43-51
Author(s):  
A. L. Vorontsov ◽  
◽  
I. A. Nikiforov ◽  
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Central Area ◽  
Direct Extrusion ◽  
Deformed State ◽  
Cumulative Deformation ◽  
The Given ◽  
General Method

Formulae have been obtained that are necessary to calculate cumulative deformation in the process of straitened extrusion in the central area closed to the working end of the counterpunch. The general method of plastic flow proposed by A. L. Vorontsov was used. The obtained formulae allow one to determine the deformed state of a billet in any point of the given area. The formulae should be used to take into account the strengthening of the extruded material.

Computer Simulation of Kinematics of Plastic Flow and the Deformed Condition of Metal at Processes Equal-Channel Angular Pressing

2008 ◽  
Vol 584-586 ◽  
pp. 1077-1082
Author(s):  
Aleksandr V. Belevich ◽  
D.M. Babin
Keyword(s):  
Computer Simulation ◽  
Carbon Steel ◽  
Plastic Flow ◽  
Equal Channel Angular Pressing ◽  
Technological Process ◽  
Equal Channel Angular Extrusion ◽  
Theoretical Research ◽  
Angular Pressing ◽  
The Given ◽  
Local Parameters

Object of researches in the given paper is the technological process of obtaining from carbon steel method equal-channel angular extrusion (ECAE) on one pass. The purpose of theoretical research is the working of recomdations on projection of the process with the help of a designed technique of simulation of process ECAE in CAE systems. Calculations were done under variable conditions ECAE over the range changes of parameters: a corner of intersection of channels Ф from 90 up to 150 grades, speed of driving press from 0,05 m/s up to 0,2 m/s, temperature from 20°С up to 600°С. As a result quantitative links of local parameters (stresses, strains and temperature) are established with geometrical and technological ECAE parameters to one separate pass. Regularities of change of parameters to ECAE process of cylindrical preforms in diameter of 20 mm and 30 mm are established (steel 0,15%С), are investigated; character of change of a tension in the instrument and power conditions of the process was studied.

“Communication gap” as a deterrent to the growth of Russian exports and ways to overcome it

2019 ◽  
pp. 123-134
Author(s):  
Dmitry V. Bortsov
Keyword(s):  
Developing Countries ◽  
Support System ◽  
Initial Contact ◽  
Special Importance ◽  
Main Difficulty ◽  
Foreign Markets ◽  
State Institutions ◽  
Communication Gap ◽  
The Given ◽  
Main Factor

The article considers the basic scenarios of matchmaking business contacts between Russian manufactures and bulk distributors from the developing countries and also the factors blocking them. The definition “Communication gap” as the main factor that hinders growth of the Russian export has been introduced. The activities of the basic state and non-state institutions assisting Russian companies to enter foreign markets have been analyzed. The concept of constructing a new export support system by minor adjustment of the special state authorities’ activities and with the use of their available facilities has been suggested. The application of the given approach has special importance for Russian small- and middle-sized producers, many of whom have no access to foreign markets. The main difficulty of this situation is related to the initial contact level.

scholarly journals Structural Steels. A Case Hardening Steel, "ALFA Steel", for Cold Forging.

DENKI-SEIKO ◽  
1998 ◽  
Vol 69 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Yutaka Kurebayashi ◽  
Sadayuki Nakamura
Keyword(s):  
Structural Steels ◽  
Cold Forging ◽  
Case Hardening ◽  
Case Hardening Steel

scholarly journals THE COMPARATIVE ASPECTS OF TWO MODIFICATIONS OF GASTRIC RESECTION ACCORDING T. BILLROTH TECHNIQUE IN ONCOLOGIC PRACTICE

2018 ◽  
Vol 24 (3) ◽  
pp. 151-156
Author(s):  
Temuri Sh. Morgoshia
Keyword(s):  
Digestive Tract ◽  
Gastric Resection ◽  
Functional Results ◽  
Malignant Neoplasms ◽  
Billroth Ii ◽  
Billroth I ◽  
The Given ◽  
Methods Of Treatment ◽  
Main Factor

The surgical intervention implying total ablation of tumor, continues to be the only method giving hope for recovery of patient despite a significant number of combined and complex methods of treatment of the given disease. However, many positions of the given conception underwent cardinal changes. Nowadays, most of authors recommend after gastric resection to restore to the extent possible natural anatomic relationships that provides best functional results. At the same time, certain researchers give preference to Billroth-II mode and at that some of them are devoted opponents of gastric resection by Billroth-I mode in case of cancer. This opinion is based on supposition that gastric resection by Billroth-II mode provides in greater extent radicalism in case of treatment of malignant neoplasms of given localization. The main factor restraining application of this most physiological operation is established opinion alleging its oncologic non-efficacy. The thesis is substantiated that intervention into modification of operation according Billroth method does not result in increasing of number of post-operative complications and that there is no differences also in distant results of surgical treatment of gastric cancer in case of application of both modes of restoration of continuity of digestive tract after sub-total distal resection. At the same time, quality of life of patients becomes better after reconstruction of digestive tract using gastroduodenal anastomosis. Most of researchers, studying indications to sub-total gastric resection using method Billroth-I, assume that it is reasonable to apply this particular mode of restoration of continuity of gastrointestinal tract only in case of early cancer, its exophytic forms (stage I and II) located in area of stomach angle or its low one third of its body and absence of metastases into regional lymphatic nodes.

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