Schwingungsüberlagertes Axialformen/Superimposed Oscillated Axial Forming

2020 ◽  
Vol 110 (11-12) ◽  
pp. 838-843
Author(s):  
Philipp Müller ◽  
Bernd-Arno Behrens ◽  
Sven Hübner ◽  
Hendrik Vogt ◽  
Daniel Rosenbusch ◽  
...  
Keyword(s):  
Surface Quality ◽  
Economic Importance ◽  
Combined Effect ◽  
Wird Eine ◽  
Forming Force ◽  
Forming Process ◽  
Forming Technology ◽  
Great Economic Importance ◽  
Gear Geometry

Techniken zur Steigerung der Formgebungsgrenzen in der Umformtechnik sind von hoher wirtschaftlicher Bedeutung. In dieser Arbeit wird eine Schwingungsüberlagerung im Krafthauptfluss eines Axialformprozesses zur Ausprägung einer Verzahnungsgeometrie untersucht. Die Auswirkungen der Schwingung auf die erzielbare Ausfüllung der Zahnkavitäten werden analysiert sowie die Parameter Schmierung und Oberflächengüte der Halbzeuge in ihrer kombinierten Wirkung untersucht. Es konnte eine Reduzierung der mittleren Umformkraft sowie eine Erhöhung der Formfüllung festgestellt werden. Techniques for extending the production limits in forming technology are of great economic importance. In this research, a superimposed oscillation in the main force flow of an axial forming process to form an axial gear geometry is investigated. The effects of the superimposed oscillation on the achievable form-filling of the tooth cavities are analyzed and the parameters lubrication and surface quality of the semi-finished products are investigated in their combined effect. A reduction of the averaged forming force as well as an increase of the form-filling could be achieved.

Influence of Roller on Tooth Height of Internal Spline Formed by Spin-Forming

2012 ◽  
Vol 522 ◽  
pp. 268-271
Author(s):  
Ling Yan Sun ◽  
Qin Xiang Xia ◽  
Xiu Quan Cheng ◽  
Bang Yan Ye
Keyword(s):  
New Technology ◽  
Internal Surface ◽  
Height Distribution ◽  
Forming Force ◽  
Nose Radius ◽  
Forming Process ◽  
Element Simulation ◽  
Gear Manufacturing ◽  
Spinning Force

Spin-forming of part with internal tooth is a new technology of the near-net forming in gear manufacturing field. And the main purpose of the parts spin-forming is to shape teeth on the internal surface of blank. In order to improve the forming quality of internal tooth, the effect of roller on tooth height of spline was investigated by processing experiments and finite element simulation. The result indicates that, for full-radius roller, a large nose radius has also witnessed a discernible growth in spinning force and tooth height; considering the uniformity of tooth height distribution of spun part and decrease in forming force, the bio-conical roller is more suitable for this forming process

scholarly journals Analysis of the multilayer woven fabric behaviour during the forming process: focus on the loss of cohesion within the woven fibre network

2019 ◽  
Vol 20 (4) ◽  
pp. 407
Author(s):  
Ahmad Rashed Labanieh ◽  
Christian Garnier ◽  
Pierre Ouagne ◽  
Olivier Dalverny ◽  
Damien Soulat
Keyword(s):  
Woven Fabric ◽  
Carbon Fabric ◽  
Mechanism Of Formation ◽  
Forming Force ◽  
Forming Process ◽  
Plane Shear ◽  
Blank Holder ◽  
Fibre Network ◽  
Process Loss

The first step in the composite manufacturing process consists of forming a flat textile reinforcing structure into a 3D shape. The quality of the final composite part is affected by the presence of defects induced during the forming process. Loss of cohesion in the woven fibre network (intra-ply yarn sliding) is a frequent defect in the forming process. It is expected when the cohesion between the yarns is weak or when the blank holder pressure is high. However, the mechanism of formation of this defect is not fully understood. In the present study, forming experiments with friction-based holder have been conducted for a monolayer twill woven carbon fabric in two orientations and for two plies of this fabric with different relative orientations. The occurrence of the intra-ply yarns sliding has been observed as a function of the blank holder pressure. A correlation between the occurrence of this defect and the fabric orientation has been noticed. Furthermore, the effect of the fabric orientation, number of plies, relative plies orientation and blank holder pressure on the recorded forming force and on the fabric in-plane shear is also reported and analysed.

scholarly journals Development of customs infrastructure on the Ukrainian –Polish border in the conditions of business internationalization

2021 ◽  
Vol 2021 (2) ◽  
pp. 140-148
Author(s):  
Marta Adamiv ◽  
◽  
Mariana Ruda ◽  
Keyword(s):  
Foreign Trade ◽  
Economic Importance ◽  
Export Market ◽  
The European Union ◽  
Present Stage ◽  
Great Economic Importance ◽  
History Of ◽  
Speed Up ◽  
Trade Partners

The relations between Ukraine and Poland represent a long history of partnership and have a great economic importance for both countries. At the present stage, Poland is one of the largest international trade partners of our country. In the history of Ukraine's foreign trade during 2019-2020, Poland occupied second place in the structure of domestic exports. Thus, in 2020 the share of exports of Ukrainian goods to Poland was 6.65%. First of all, it means a change in the vector of foreign trade development for the national economy and the reorientation of Ukraine's export market to the European Union. In 2020, Poland also occupied one of the leading positions in the structure of Ukrainian imports of goods (4th place with a share of 7.62%). This situation leads to a significant increase in the load at checkpoints and causes the need to ensure prompt and efficient customs clearance of goods moving across the Ukrainian-Polish border. On the basis of the performed researches, significant differences in the levels of development of the customs services of Poland and Ukraine in terms of the quality of customs services have been established, as Ukraine lags far behind Poland in all the studied indicators in this area. Such situation requires the improvement of the work of Ukrainian customs authorities in the context of business internationalization, including the development of customs infrastructure in the area of the Ukrainian-Polish border. The key problems of customs service of enterprises at domestic checkpoints include long and costly customs procedures, lack of proper technical, road, information infrastructure at checkpoints, outdated technical instruments of customs control, etc. It is proved that in the conditions of business internationalization one of the key tasks should be the construction of new checkpoints and the development of the customs infrastructure of the existing checkpoints. The key strategically important checkpoints in the area of the Ukrainian-Polish border, which need to be modernized in order to increase their capacity, include road checkpoints "Korchova-Krakivets", "Dorokhusk-Yagodyn", "Medyka-Shehyni", as well as a railway checkpoint "Medyka-Mostyska". In addition, the importance of spreading the practice of construction of joint checkpoints, which allows to significantly speed up the process of customs services for businesses, was emphasized.

Development of Hot Press Machine for Superplastic Forming Technology

2011 ◽  
Vol 228-229 ◽  
pp. 563-567 ◽  
Author(s):  
Ho Sung Lee ◽  
Jong Hoon Yoon ◽  
Joon Tae Yoo ◽  
Yeng Moo Yi
Keyword(s):  
Control Process ◽  
Superplastic Forming ◽  
Gas Pressure ◽  
Process Variables ◽  
Hot Press ◽  
Forming Force ◽  
Forming Process ◽  
Forming Technology ◽  
Bonding Technology ◽  
And Diffusion

In most superplastic forming process, one or more sheets of superplastic grade materials are heated and forced onto or into single surface tools by gas pressure. Since the assembly includes only clamping dies, temperature chamber and regulated gas pressure to provide forming force, the assembly is easy to use for aircraft components. However, it is not easy to control process variables at high temperature. This paper presents an economic machinery method to develop hot press machine for manufacturing complex contoured components using superplastic forming and diffusion bonding technology.

Research on Catalyst Penetration Process of Patternless Casting Manufacturing Technique

2014 ◽  
Vol 609-610 ◽  
pp. 1515-1520 ◽  
Author(s):  
Wei Dong Yang ◽  
Zhan Qun Shi ◽  
Li Li
Keyword(s):  
Rapid Prototyping ◽  
Surface Quality ◽  
Dimensional Accuracy ◽  
Single Droplet ◽  
Forming Process ◽  
Penetration Process ◽  
Forming Quality ◽  
Main Factors ◽  
Sand Particles

Pattenless Casting Manufacturing (PCM) technique is a kind of Rapid Prototyping based on droplet injection, using discrete nozzle to jet the catalyst. The quality of scanning lines has the most important effect on the sand strength, its surface quality and dimensional accuracy. The penetration and curing rules of the catalyst in the resined-sand particles are the main factors to determine the shape of the scanning lines. In order to study the penetration rules of the catalyst in the resined-sand, the penetration process of a single droplet and scanning lines are analyzed theoretically and verified by experiments. The important parameters of the forming process are determined based on the research and experimental results. It will provide the foundation to improve the forming quality of PCM technique.

Superimposing Ultrasonic Waves on the Dies in Tube and Wire Drawing

2001 ◽  
Vol 123 (4) ◽  
pp. 517-523 ◽  
Author(s):  
Klaus Siegert ◽  
Jochen Ulmer
Keyword(s):  
Sliding Friction ◽  
Wire Drawing ◽  
Ultrasonic Waves ◽  
Forming Process ◽  
Vibration Direction ◽  
Tube Drawing ◽  
Forming Technology ◽  
The University ◽  
Main Influence

The forces during wire and tube drawing can be reduced by ultrasonically oscillating dies. It is a major problem of conventional wire and tube drawing to introduce high forces into the forming area. Compared to conventional wire and tube drawing, the forming process limits can be extended by superimposing ultrasonic waves due to decreasing drawing forces. Different techniques can be used to excite the die. One possibility is the variation of the vibration mode. In tube and wire drawing, the dies are usually excited longitudinally. If the vibration direction is parallel to the drawing direction, the main influence will be on the friction between workpiece and die. The Institute for Metal Forming Technology of the University of Stuttgart, Germany started a project to investigate the effect of ultrasonic waves on the tribology and on the formability of the workpiece. The objective of this investigation is to separate the ultrasonic effect on the surface from the volume effects. This paper shows that the reduction of the sliding friction between a longitudinal oscillating die and the workpiece can be explained by the so-called Sliding Friction Vector Effect (SFVE). A statistical evaluation of roughness-measurements makes it possible to show the effect of the ultrasonic vibration on the friction and gives an insight into the operation of the SFVE. The results are compared with wire and tube drawing experiments of copper and Ti-alloys. New tube- and wire-drawing experiments with longitudinally vibrating dies support the theoretical approach. The surface quality of the manufactured workpieces can be improved and the productivity increased.

scholarly journals Experimental Modeling of Pressure in the Hydrostatic Formation of a Cylindrical Cup with Different Materials

2021 ◽  
Vol 11 (13) ◽  
pp. 5814
Author(s):  
Trung-Kien Le ◽  
Thi-Thu Nguyen ◽  
Ngoc-Tam Bui
Keyword(s):  
Fluid Pressure ◽  
Regression Method ◽  
Mathematical Equation ◽  
Forming Process ◽  
Forming Technology ◽  
Input Parameters ◽  
Sheet Products ◽  
Cylindrical Cup ◽  
The Relationship

Forming complex sheet products using hydrostatic forming technology is currently a focus of the majority of forming processes. However, in order to increase stability during the forming process, it is necessary to identify and analyze the dependency of the forming pressure and the quality of a product on input parameters. For the purpose of modeling the forming pressure, this paper presents empirical research on the product of a cylindrical cup made of various materials, including carbon steel (DC04), copper (CDA260), and stainless steel (SUS 304) with different thicknesses (0.8 mm, 1.0 mm, and 1.2 mm), under a defined range of binder pressures. The regression method is selected to formulate an equation that shows the relationship between the input parameters, including the materials (ultimate strength and yield stress), workpiece thickness, binder pressure and the output parameter, and the formation of fluid pressure. The mathematical equation allows us to determine the extent of the effect of each input on the forming pressure. The experimental results can be used for the easier planning and forecasting of the process and product quality in hydrostatic forming.

Investigation of the Influence of a Superimposed Oscillated Forming Process on Forming Characteristics

2021 ◽  
Vol 883 ◽  
pp. 181-186
Author(s):  
Philipp Müller ◽  
Sven Hübner ◽  
Daniel Rosenbusch ◽  
Hendrik Vogt ◽  
Bernd Arno Behrens
Keyword(s):  
Surface Quality ◽  
Sheet Metal ◽  
Material Flow ◽  
New Technologies ◽  
High Surface ◽  
Efficient Production ◽  
Forming Process ◽  
Forming Technology ◽  
Forming Characteristics ◽  
Functional Components

The increasing demand for resource-efficient production methods is driving the development of new technologies. Sheet bulk metal forming (SBMF) offers the possibility to combine sheet metal and bulk forming operations. This allows the production of complex functional components with secondary forming elements from sheet metal. Compared to other production techniques such as machining, a more efficient use of material can be achieved. Further advantages are a near net shape production and increased strain hardening. SBMF processes are limited by forming technology boundaries. These include high forming forces, incomplete mould fillings and limited surface qualities. In this research, the possibility of enhancing the material flow, improving surface quality and reducing the tool loads in SBMF-processes is investigated by using a superimposed oscillation. The focus here is on achieving a high surface quality of components produced by forming technology and an enhanced material flow during forming. For this purpose, a forming process for ironing an axial gear geometry is superimposed with an oscillation in the main force flow.

Effect of Pattern-Less Forming Process on Quality of Sand Mold Surface

2020 ◽  
Vol 1001 ◽  
pp. 115-120
Author(s):  
Li Jun Guo ◽  
Zhong De Shan ◽  
Er Biao Jiang
Keyword(s):  
Surface Quality ◽  
Great Influence ◽  
Sand Mold ◽  
Extrusion Force ◽  
Mold Surface ◽  
Object Surface ◽  
Forming Process ◽  
Abrasive Resistance ◽  
Sand Material

The pattern-less sand mold was used as the research object, surface quality of sand mold was carried out by using surface abrasion tester. In this paper, the influence of sand material such as the types of sand, resin contents and extrusion pressure on the surface quality was studied through the single-factor test. The results showed that: different sand mold had different surface abrasive resistance. The angle coefficient of sand has a great influence on the surface abrasive resistance of the sand mold. With the increase of extrusion force, the surface abrasive resistance of sand mold increased. And as the resin content increased, the surface abrasive resistance of sand mold continued to increase.

scholarly journals Biotechnological starter potential for cocoa fermentation from cabruca systems / Potencial biotecnológico de leveduras starter na fermentação do cacau de sistema cabruca

2021 ◽  
Vol 7 (6) ◽  
pp. 60739-60759
Author(s):  
Carine Martins Dos Santos ◽  
Adriana Barros de Cerqueira E Silva ◽  
Eric de Lima Silva Marques ◽  
Rachel Passos Rezende ◽  
Carlos Priminho Pirovani ◽  
...  
Keyword(s):  
Molecular Typing ◽  
Economic Importance ◽  
Raw Material ◽  
Plate Method ◽  
Spontaneous Fermentation ◽  
Great Economic Importance ◽  
Yeast Inoculum ◽  
Typing Technique ◽  
Cocoa Fermentation

Cocoa is a fruit of great economic importance, being the main raw material in the manufacture of chocolate. Among the stages of pre-processing, the main and most important is the spontaneous fermentation of the cocoa pulp by microorganisms, especially the yeasts, which initiate the process and contribute to the death of the germ of the seed, releasing compounds that directly influence the quality of the final product (flavor and aroma). Poorly fermented almonds confer bitter and astringent taste on chocolate, so it is advantageous to select autochthonous yeasts with better performance in the fermentation (producing enzymes of interest in the process) to be used as inoculum starter when added in the spontaneous fermentation, where they can accelerate the fermentation and contribute to raising the quality of the product. Therefore, the objective of this work was to qualitatively determine the production of enzymes of biotechnological interest by yeasts for the fermentation of cocoa through the cup plate method, in order to select a candidate yeast inoculum and use molecular typing technique to evaluate the diversity. Many promising yeasts were identified for use as inoculum among the diverse yeast groups found.

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