Evaluating the stability of the forming process of viscose cord fibre

1969 ◽  
Vol 1 (1) ◽  
pp. 99-100 ◽  
Author(s):  
E. V. Cherkasova ◽  
P. T. Serkov ◽  
N. P. Kruchinin
Keyword(s):  
Forming Process ◽  
Cord Fibre ◽  
Viscose Cord ◽  
The Stability

Production of viscose cord fibre and 17C and 22C cord fabrics

1972 ◽  
Vol 2 (6) ◽  
pp. 538-539
Author(s):  
V. I. Khrulev ◽  
G. A. Maksimova ◽  
A. G. Arseenko ◽  
R. G. Ermolaeva ◽  
V. P. Abramenko
Keyword(s):  
Cord Fibre ◽  
Viscose Cord

The Software Development of Double-Beam Centroid Distance Measurement System in Laser Cladding Forming Process

2011 ◽  
Vol 464 ◽  
pp. 524-527
Author(s):  
Cheng Feng Sun ◽  
Shi Hong Shi ◽  
Ge Yan Fu ◽  
Chun Sheng Li
Keyword(s):  
Laser Cladding ◽  
Molten Pool ◽  
Forming Process ◽  
Development Platform ◽  
Laser Head ◽  
Centroid Distance ◽  
Double Beam ◽  
Spot Image ◽  
The Stability ◽  
Effect Of Light

In the high-piled up process of laser cladding rapid forming , the distance between aser molten pool center and flour will increase along with the cladding layer ,which will cause the effect of light powder coupling getting worse, even directly lead to failure. The article proposed characteristics of the double-spot ,formed by molten pool and reflection of laser surface;used VC++ 6.0 as the development platform of image processing to calculate two spot centroid distance by dealing two spot image with the process of gray processing, Gaussian smoothing, binary threshold segmentation, area centroid calculation, the centroid coordinate distance calculation.At the same time , controlling laser head Z to move in accordance with the value increment,to increase the stability of forming process and forming quality.

scholarly journals Melt strengthening of polylactic acid and its blends: Shear and elongation rheological investigations of the forming process

2021 ◽  
Author(s):  
Abderrahim Maazouz ◽  
Khalid Lamnawar
Keyword(s):  
Polylactic Acid ◽  
Blow Up ◽  
Good Alternative ◽  
Thermomechanical Properties ◽  
Chain Extension ◽  
Nucleating Agents ◽  
Forming Process ◽  
Exclusion Chromatography ◽  
Stability Maps ◽  
The Stability

Polylactic acid (PLA) can be a good alternative to petroleum-based polymers thanks to its organic origin and its biodegradability. This study introduces some promising routes for enhancing the processability of PLA, which presents several challenges due mainly to the poor shear and elongation properties of this biopolymer. To our knowledge, this is the first paper dedicated to an investigation of foaming and/or blown extrusion of PLA that focuses on structural, rheological and thermomechanical properties. Two main routes were selected: (i) the modification of its structural, rheological and thermomechanical properties and (ii) blending the PLA with another ductile, thermoplastic biopolymer such as poly (butylene adipate-co-terephthalate) (PBAT) or polyamide (PA11). Various formulations of PLA with multifunctionalized epoxy, nucleating agents and plasticizer were prepared and characterized on the basis of their linear viscoelasticity and extensional properties. The balance of chain extension and branching was also investigated using solution viscosimetry, steric exclusion chromatography (SEC) and rheology (shear and elongation rheology). On one hand, a batch foaming process assisted by supercritical CO2 was carried out. The influence of the foaming parameters, the extent of chain modification and the contribution of crystallization to cell morphology were all evaluated. Based on these parameters, structures ranging from micro to macro-cellular-cell were obtained. On the other hand, the stability maps of blown extrusion for neat and modified PLA were established at different die temperatures. We succeeded in greatly enhancing the blown extrusion windows of PLA, achieving high blow-up ratio (BUR) and take-up ratio (TUR) values. We were able to demonstrate that faster kinetics of crystallization can also be reached for chain-extended and branched PLA formulated with adequate amounts of nucleating agents and plasticizers. Through this work, blown films with intriguing thermomechanical and mechanical properties were produced using an optimal formulation for PLA. 

Analysis of steady conditions for spinning of viscose cord fibre

1994 ◽  
Vol 26 (3) ◽  
pp. 167-169
Author(s):  
S. V. D'yachenko ◽  
Yu. V. Grigor'ev
Keyword(s):  
Cord Fibre ◽  
Viscose Cord

Study of the supermolecular structure of superstrong viscose cord fibre

1964 ◽  
Vol 6 (7) ◽  
pp. 1282-1290
Author(s):  
V.A. Berestnev ◽  
K.Kh. Razikov ◽  
V.A. Kargin
Keyword(s):  
Supermolecular Structure ◽  
Cord Fibre ◽  
Viscose Cord

scholarly journals Interface Reaction between Molten Al99.7 Aluminum Alloy and Various Tool Steels

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7708
Author(s):  
Maja Vončina ◽  
Tilen Balaško ◽  
Jožef Medved ◽  
Aleš Nagode
Keyword(s):  
Aluminum Alloy ◽  
Intermetallic Layer ◽  
Interface Reaction ◽  
Casting Process ◽  
Ferrite Matrix ◽  
Tool Steels ◽  
Forming Process ◽  
Scanning Calorimetry ◽  
Thermo Calc Software ◽  
The Stability

During the die-casting process as well as the hot forming process, the tool is subjected to complex thermal, mechanical, and chemical stresses that can cause various types of damage to different parts of the tool. This study was carried out to determine the resistance of various tool steels, i.e., UTOPMO1, HTCS-130, and W600, in molten Al99.7 aluminum alloy at a temperature of 700 °C. The formation kinetics of the interaction layer between the molten aluminum and tool steels was studied using differential scanning calorimetry. Light and field-emission scanning electron microscopy were used to analyze the thickness and nature of the interaction layers, while thermodynamic calculations using the Thermo-Calc software were used to explain the results. The stability of the HTCS-130 and W600 tool steels is better than the stability of the UTOPMO1 tool steel in the molten Al99.7 aluminum. Two interaction layers were formed, which in all cases indicate an intermetallic Al13Fe4 layer near the aluminum alloy and an intermetallic Al5Fe2 layer near the tool steels, containing small round carbides. It was confirmed that Ni reduces the activity of aluminum in the ferrite matrix and causes a reduction in the thickness of the intermetallic layer.

Study on the Stability in Laser Cladding Forming Process of Thin-Wall Structures

2010 ◽  
Vol 148-149 ◽  
pp. 157-162
Author(s):  
Wei Wei Hu ◽  
Jin Wu Kang ◽  
Ji Yu Ma ◽  
Tian You Huang ◽  
Di Chen Li ◽  
...  
Keyword(s):  
Transition Zone ◽  
Laser Cladding ◽  
Laser Power ◽  
Processing Parameters ◽  
Thin Wall ◽  
Forming Process ◽  
Pool Depth ◽  
Melt Pool ◽  
Laser Velocity ◽  
The Stability

The parameters obtained in the study of single layer of laser cladding forming are not suitable for the forming of actual structures. The cooling condition varies with the height of clad layers, which result in instability and then failure of cladding. Therefore, the stability of laser cladding forming is of significance. In this paper, melt pool depth is used as a criteria for stability. And the effect of processing parameters such as laser power and laser velocity on melt pool depth, are investigated by numerical simulation method. The results unveil that there is a transition zone from the beginning to stable stage during laser cladding forming. In the transition zone, laser power should be decreased or laser velocity should be increased to maintain the constant melt pool depth and to ensure the former clad layer would not be remelt. The optimized processing parameters are obtained for stable processing for a thin flat wall and a cylindrical wall, which successfully guide the manufacturing of the real structures.

A Study on the Stability of Innovation Network in Tech-Typed Small and Medium-Sized Enterprises Based on Cooperative Game

2011 ◽  
Vol 65 ◽  
pp. 350-353
Author(s):  
Cui Hua Wu ◽  
Hui Li ◽  
Ying Liu
Keyword(s):  
Cooperative Game ◽  
Innovation Network ◽  
Forming Process ◽  
Cooperation Mechanism ◽  
Theoretical Significance ◽  
Innovation Ability ◽  
The Stability ◽  
Innovation Mechanism

In the new condition of improving tech-typed small & medium-sized enterprises, it has important realistic meaning and theoretical significance how to construct a stability innovation network to ensure the enterprises innovation ability, and format and optimize innovation mechanism. In this paper, cooperative game method is used to describe and script the forming process of cooperation mechanism among network members, and its stability is analyzed and discussed. On the basis of this, it points out that only in cooperation, the stability of innovation network can be ensured, and it will make the all sides of innovation network get the largest benefits.

scholarly journals Stability Analysis of Steel Welded Tubes Forming Process Using Numerical Simulations

2021 ◽  
Vol 15 (2) ◽  
pp. 298-304
Author(s):  
Marko Delić ◽  
Vesna Mandić ◽  
Marko Popović
Keyword(s):  
Influencing Factors ◽  
Numerical Experiments ◽  
Hard Metal ◽  
Outer Diameter ◽  
Forming Process ◽  
Tube Forming ◽  
Welded Tube ◽  
Optimal Values ◽  
Geometrical Factors ◽  
The Stability

In this paper, the research results of the stability of steel welded tubes forming process are presented. The aim of this research is to determine influence of geometrical and tribological parameters on stability of the process and to determine optimal values of influential process parameters. A research plan with variation of influential parameters was made, on the basis of which experimental and numerical experiments were performed. Tube forming was performed in one operation in a two-part tool made of hard metal by a combination of widening and narrowing. The geometrical factors observed during experiments are length, outer diameter and thicknesses of steel welded tube as a billet. Friction conditions in contact between tool and tubular workpiece are considered in two cases, the first one when standard machine oil is used as a lubricant and the second one when tube billet surface is phosphated. Based on results of experiments, influencing factors on stability of tube forming process were analysed and optimal production technology was recommended, including optimal values of influencing factors. Results obtained by experimental research were confirmed through numerical experiments based on finite element method.

Note on the forming mechanism of viscose cord fibre

1971 ◽  
Vol 2 (1) ◽  
pp. 31-34 ◽  
Author(s):  
G. A. Volkov
Keyword(s):  
Cord Fibre ◽  
Forming Mechanism ◽  
Viscose Cord
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