COMBINED EXTRUSION OF GLASSES WITH A CONICAL BOTTOM. THE RELEVANCE OF RESEARCH

10.14489/hb.supp.2021.7.pp.002-012 ◽

2021 ◽

pp. 2-12 ◽

Cited By ~ 7

Author(s):

A. L. Vorontsov ◽

D. A. Lebedeva

Keyword(s):

Plastic Deformation ◽

Plastic Flow ◽

Mathematical Analysis ◽

Mathematical Study ◽

Successful Design ◽

Using the general methods of A. L. Vorontsov, a mechanical and mathematical study of the fourth and fifth variants of the process of combined extrusion of glasses with a conical bottom was carried out. All necessary design schemes are presented. Calculation formulas have been obtained that make it possible to determine the deformation forces and the magnitude of the plastic deformation areas for each possible variant of the plastic flow of the workpiece metal. These formulas also make it possible to determine which variant of deformation will occur in a particular case, and are necessary for the successful design of this operation. The results of confirming experiments are presented.

COMBINED EXTRUSION OF GLASSES WITH A CONICAL BOTTOM. METHODOLOGY FOR CALCULATING TECHNOLOGICAL PARAMETERS OF FREE EXTRUSION AT INITIAL DEFORMATION BY BENDING

10.14489/hb.supp.2021.11.pp.009-015 ◽

2021 ◽

pp. 9-15

Author(s):

A. L. Vorontsov ◽

D. A. Lebedeva

Keyword(s):

Initial Deformation ◽

Deformed State ◽

All geometric formulas necessary for designing the process of extrusion of glasses with a conical bottom are obtained. Further, the obtained formulas will be used to develop scientifically based methods for calculating technological operations of free and constrained extrusion. The substantiation of the use of the wellknown methods of A. L. Vorontsov, developed for extrusion of glasses with a punch with a flat end, for calculating the deformed state of the workpiece is given.

Combined EXTRUSION OF GLASSES WITH A CONICAL BOTTOM. METHODOLOGY FOR CALCULATING TECHNOLOGICAL PARAMETERS OF CONSTRAINED EXTRUSION AT INITIAL DEFORMATION BY BENDING

10.14489/hb.supp.2021.11.pp.016-023 ◽

2021 ◽

pp. 16-23

Author(s):

A. L. Vorontsov ◽

D. A. Lebedeva

Keyword(s):

Yield Stress ◽

Initial Deformation ◽

Maximum Pressure ◽

Bottom Part ◽

Hardening Material ◽

Deformation Parameters ◽

Stamping Process ◽

The methodology for calculating the energy-power and deformation parameters of the process of constrained extrusion of glasses with a conical bottom part, starting with the bend of the workpiece. The extrusion of both non-hardening and hardening material is considered. In the latter case, the account of the hardening of the extruded material is described in detail. The above formulas allow us to determine such important parameters of the stamping process as total and specific deforming force, maximum pressure on the die wall, and an increase in the yield stress.

COMBINED EXTRUSION OF GLASSES WITH A CONICAL BOTTOM. MECHANICAL AND MATHEMATICAL ANALYSIS OF THREE OPTIONS FOR THE PROCESS

10.14489/hb.supp.2021.5.pp.015-020 ◽

2021 ◽

pp. 15-20

Author(s):

A. L. Vorontsov ◽

D. A. Lebedeva

Keyword(s):

Plastic Deformation ◽

Plastic Flow ◽

Mathematical Analysis ◽

Mathematical Study ◽

Successful Design ◽

Using the general methods of A. L. Vorontsov, a mechanical and mathematical study of the first three variants of the process of combined extrusion of glasses with a conical bottom was carried out. All necessary design schemes are presented. Calculated formulas have been obtained that make it possible to determine the deformation forces and the magnitude of the plastic deformation areas for each possible variant of the plastic flow of the workpiece metal. These formulas also make it possible to determine which variant of deformation will occur in a particular case, and are necessary for the successful design of this operation.

COMBINED EXTRUSION OF GLASSES WITH A CONICAL BOTTOM. KINEMATIC AND STRESS STATES OF THE PLASTIC AREA LOCATED UNDER THE CENTRAL FLAT SURFACE OF THE PUNCH

10.14489/hb.supp.2021.10.pp.008-013 ◽

2021 ◽

pp. 8-13 ◽

Cited By ~ 3

Author(s):

A. L. Vorontsov ◽

D. A. Lebedeva

Keyword(s):

Plastic Deformation ◽

Plastic Flow ◽

Mathematical Analysis ◽

Flat Surface ◽

The Future ◽

Stress States ◽

For extrusion of glasses with a conical bottom using the method of plastic flow by A. L. Vorontsov, the kinematic and stress states of the extruded metal in the area of the plastic deformation center located under the central flat surface of the punch were determined. The formulas for the deforming force and the height of the zone of plastic deformation are obtained. In the future, the results of this mechanical and mathematical analysis will make it possible to formulate a scientifically grounded methodology for calculating the main technological parameters of extrusion of nozzles with a conical bottom, as well as to investigate the issue of the presence of the taper of the punch, which is optimal in strength.

Combination of Different Methods to Characterize Micromechanical Sensors

MRS Proceedings ◽

10.1557/proc-459-243 ◽

1996 ◽

Vol 459 ◽

Cited By ~ 2

Author(s):

R. Buchhold ◽

U. Büttner ◽

A. Nakladal ◽

K. Sager ◽

E. Hack ◽

...

Keyword(s):

Pressure Sensors ◽

True Nature ◽

Complex Fault ◽

Successful Design ◽

Micromachined Sensors ◽

Micromechanical Sensors ◽

Piezoresistive Pressure Sensors ◽

Sensor Accuracy

ABSTRACTIn the last years many micromachined sensors for measuring quite different quantities have been developed (e.g. [1][2]). The successful design of silicon micromachined sensors and their conversion into commercial products is still limited by the lack of full understanding of complex fault mechanisms. In order to detect those mechanisms it seems to be advantageous to investigate interrelated phenomena by different analysis methods. By combining results of several means the true nature of disturbing effects can be determined much more easily.This paper describes a comprehensive approach for investigating failure mechanisms in piezoresistive pressure sensors. Sophisticated methods of signal analysis were combined with special semiconductor techniques, determination of thermo-mechanical properties, Finite-Element- (FE-) simulation and Michelson interferometry. By that it was possible to separate disturbing mechanical as well as electrical effects and their relation to sensor output and sensor accuracy, respectively. In particular, we discovered complex influences of passivation layer systems (differing in geometrical and technological parameters) on sensor accuracy.

COMBINED EXTRUSION OF GLASSES WITH A CONICAL BOTTOM. METHODOLOGY FOR CALCULATING TECHNOLOGICAL PARAMETERS OF THE TRADITIONAL PROCESS OF CONSTRAINED EXTRUSION

10.14489/hb.supp.2021.11.pp.002-008 ◽

2021 ◽

pp. 2-8

Author(s):

A. L. Vorontsov ◽

D. A. Lebedeva

Keyword(s):

Yield Stress ◽

Internal Cavity ◽

Maximum Pressure ◽

Bottom Part ◽

Hardening Material ◽

Deformation Parameters ◽

Conical Section ◽

Traditional Process ◽

The methodology for calculating the energy-power and deformation parameters of the traditional process of constrained extrusion of glasses with a conical bottom part, including preliminary obtaining by molding the outer conical section of the bottom part of the product and the subsequent reverse extrusion of the glass with an internal cavity of the required geometry, is presented. The extrusion of both non-hardening and hardening material is considered. In the latter case, the account of the hardening of the extruded material is described in detail. The above formulas allow us to determine such important parameters of the stamping process as total and specific deforming force, maximum pressure on the die wall, and an increase in the yield stress.

PUNCHING CUPS WITH BOTTOM FLANGE BY DIRECT EXTRUSION WITH COUNTER-PUNCH. ACTUALITY AND STATEMENT OF PROBLEM

10.14489/hb.supp.2020.04.pp.002-009 ◽

2020 ◽

pp. 2-9 ◽

Cited By ~ 13

Author(s):

A. L. Vorontsov ◽

I. A. Nikiforov

Keyword(s):

Complete System ◽

Mathematical Problem ◽

Bottom Flange ◽

Direct Extrusion ◽

Successful Design

The actuality of the study is justified in order to determine the main technological parameters of direct extrusion using the counter-punch necessary for the successful design of the process of punching cups with a flange in the bottom. The solvable mechanical and mathematical problem is formulated and complete system of the necessary initial equations is given.

COMBINED EXTRUSION OF GLASSES WITH A CONICAL BOTTOM. METHODOLOGY FOR CALCULATING TECHNOLOGICAL PARAMETERS OF THE TRADITIONAL FREE EXTRUSION PROCESS

10.14489/hb.supp.2021.10.pp.019-024 ◽

2021 ◽

pp. 19-24 ◽

Cited By ~ 3

Author(s):

A. L. Vorontsov ◽

D. A. Lebedeva

Keyword(s):

Extrusion Process ◽

Internal Cavity ◽

Maximum Pressure ◽

Bottom Part ◽

Hardening Material ◽

Deformation Parameters ◽

Conical Section ◽

Traditional Process ◽

The method of calculating the energy-power and deformation parameters of the traditional process of free extrusion of glasses with a conical bottom part, including preliminary formation of the outer conical section of the bottom part of the product by molding and the following reverse extrusion of the glass with an internal cavity of the required geometry. The extrusion of both non-hardening and hardening material is considered. In the latter case, the account of the hardening of the extruded material is described in detail. The above formulas allow us to determine such important parameters of the stamping process as total and specific deforming force, maximum pressure on the die wall, and an increase in the yield stress.

A tilting high temperature gas reaction chamber for the JEM 7A T.E.M.

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100107496 ◽

1978 ◽

Vol 36 (1) ◽

pp. 70-71

Author(s):

Brian L. Rhoades

Keyword(s):

Cross Section ◽

Reaction Chamber ◽

Objective Lens ◽

Reduced Cross Section ◽

Cross Sectional ◽

Structural Investigations ◽

Transmission Electron ◽

Dynamic Experiments ◽

Successful Design ◽

Thermocouple Junction

A gas reaction chamber has been designed and constructed for the JEM 7A transmission electron microscope which is based on a notably successful design by Hashimoto et. al. but which provides specimen tilting facilities of ± 15° aboutany axis in the plane of the specimen.It has been difficult to provide tilting facilities on environmental chambers for 100 kV microscopes owing to the fundamental lack of available space within the objective lens and the scope of structural investigations possible during dynamic experiments has been limited with previous specimen chambers not possessing this facility.A cross sectional diagram of the specimen chamber is shown in figure 1. The specimen is placed on a platinum ribbon which is mounted on a mica ring of the type shown in figure 2. The ribbon is heated by direct current, and a thermocouple junction spot welded to the section of the ribbon of reduced cross section enables temperature measurement at the point where localised heating occurs.