Pulvermetallurgie und Verbundschmieden*/Powder metallurgy and compound forging - Thermal process route for evaluating the influence of alloying elements on the bonding strength of hybrid components

2018 ◽  
Vol 108 (10) ◽  
pp. 686-690
Author(s):  
B. Behrens ◽  
P. Kuwert
Keyword(s):  
Powder Metallurgy ◽  
Bonding Strength ◽  
Thermal Process ◽  
Material Composition ◽  
Alloying Elements ◽  
Process Chain ◽  
Metallurgical Production ◽  
Process Route

Während der Herstellung durch Verbundschmieden beeinflussen die in den Werkstoffen enthaltenden Legierungselemente maßgeblich die Verbundqualität und führen zu teilweise hohen Abweichungen. Dieser Umstand kann durch die pulvermetallurgische Herstellung von Halbzeugen mit definierter Werkstoffzusammensetzung vermieden werden. In diesem Fachbeitrag werden die Verfahrenskombination sowie die Herausforderungen entlang der Prozesskette und entsprechende Lösungsansätze vorgestellt.   During compound forging, the alloying elements contained in the materials significantly influence the quality of the compound and in some cases lead to high deviations. This can be remedied by the powder-metallurgical production of semi-finished products with a defined material composition. This article presents the combination of processes and the challenges along the process chain as well as corresponding approaches to solutions.

INFLUENCE OF FORCED CONVECTION IN LIQUID INSIDE THE TIN ON DURATION OF STERILIZATION IN THE COURSE OF FISH PROCESSING

2017 ◽  
pp. 137-144
Author(s):  
Gennadiy Valentinovich Alexeev ◽  
Elena Igorevna Verboloz
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
Forced Convection ◽  
Thermal Process ◽  
Processing Time ◽  
Fish Processing ◽  
Study Results ◽  
Equipment Modernization ◽  
Bottom To Top

The article focuses on the process of intensive mixing of liquid phase in the tin during high-temperature sterilization, i.e. sterilization when temperature of the heat carrier reaches 150-160°C. It has been stated that for intensification of the thermal process during sterilization of tinned fish with liquid filling it is preferable to turn a tin from bottom to top. This operation helps to increase the driving power of the process and to shorten warming time. Besides, high-temperature sterilization carried out according to experimental modes, where the number of tin turnovers is calculated, greatly shortens processing time and improves quality of the product. In this case there is no superheating, all tins are evenly heated. The study results will contribute to equipment modernization and to preserving valuable food qualities.

Boring-Rolling Process Research and Tooling Design of Hydraulic Cylinder

2013 ◽  
Vol 842 ◽  
pp. 634-638
Author(s):  
Yan Jing ◽  
Feng Zhao
Keyword(s):  
Process Parameters ◽  
High Efficiency ◽  
Hydraulic Cylinder ◽  
Rolling Process ◽  
Process Research ◽  
Cylinder Block ◽  
Process Route ◽  
Emerging Issues ◽  
Tooling Design

By comparison, this paper determines inner bore processing technic program of the engineering machinery hydraulic cylinder block and makes some analysis of the rolling processing technic and relevant emerging issues to propose reasonable and feasible process route and process parameters and ensure the quality of the cylinder processing. It also shows the design of boring-rolling compound tools with high efficiency and high precision for given cylinders.

Effect of Thermal Process Time on Quality of "Shrimp Kuruma" in Retortable Pouches and Aluminum Cans

2006 ◽  
Vol 71 (6) ◽  
pp. S496-S500 ◽  
Author(s):  
C.O. Mohan ◽  
C.N. Ravishankar ◽  
J. Bindu ◽  
V. Geethalakshmi ◽  
T.K. Srinivasa Gopal
Keyword(s):  
Thermal Process ◽  
Process Time ◽  
Aluminum Cans

Liquation and Crystallization Cracks in Aluminum Alloy AA2024 during Selective Laser Melting

2021 ◽  
Vol 410 ◽  
pp. 203-208
Author(s):  
I.S. Loginova ◽  
N.A. Popov ◽  
A.N. Solonin
Keyword(s):  
Aluminum Alloy ◽  
Selective Laser Melting ◽  
Laser Scanning ◽  
Scanning Speed ◽  
Melting Zone ◽  
Alloying Elements ◽  
Laser Melting ◽  
Laser Scanning Speed ◽  
Positive Effect

In this work we studied the microstructure and microhardness of standard AA2024 alloy and AA2024 alloy with the addition of 1.5% Y after pulsed laser melting (PLM) and selective laser melting (SLM). The SLM process was carried out with a 300 W power and 0.1 m/s laser scanning speed. A dispersed microstructure without the formation of crystallization cracks and low liquation of alloying elements was obtained in Y-modified AA2024 aluminum alloy. Eutectic Al3Y and Al8Cu4Y phases were detected in Y-modified AA2024 aluminum alloy. It is led to a decrease in the formation of crystallization cracks The uniform distribution of alloying elements in the yttrium-modified alloy had a positive effect on the quality of the laser melting zone (LMZ) and microhardness.

scholarly journals A Method to Characterize the Quality of a Polymer Laser Sintering Process

2014 ◽  
Vol 6 ◽  
pp. 185374 ◽  
Author(s):  
Stefan Rüsenberg ◽  
Stefan Josupeit ◽  
Hans-Joachim Schmid
Keyword(s):  
Layer Thickness ◽  
Laser Sintering ◽  
Thermal Ageing ◽  
Process Chain ◽  
Sintering Process ◽  
Data Set ◽  
Whole Process ◽  
Quality Aspects ◽  
Important Challenge

The reproducibility and reliability of quality aspects are an important challenge of the polymer laser sintering process. However, existing quality concepts and standardization activities considering influencing factors along the whole process chain have not been validated experimentally yet. In this work, these factors are analyzed and kept constant to obtain a reliable material data set for different layer thicknesses and testing temperatures. In addition, material qualities regarding powder ageing effects are analyzed using different build heights and layer thicknesses: while an increase of the layer thickness reduces mechanical part strength and density, it also results in a less intense thermal ageing of unmolten powder due to shorter build times.

Review: Selected indicators of the quality of thermal processed milk / Revisión: Indicadores seleccionados para el control de calidad de la leche tratada térmicamente

1999 ◽  
Vol 5 (2) ◽  
pp. 121-137 ◽  
Author(s):  
R. López-Fandiño ◽  
A. Olano
Keyword(s):  
Shelf Life ◽  
Thermal Process ◽  
Whey Proteins ◽  
Lipid Degradation ◽  
Uht Milk ◽  
Heat Stable ◽  
New Compounds

Selected indicators of the quality of processed milk are reviewed in three sections: indices of heat treatment, detection of adulterations and assessment of shelf life. The characterization of the thermal process to which milk was submitted can be achieved by measuring either the formation of new compounds (lactulose, furosine) or the degradation of thermolabile constituents (enzymes, whey proteins). The presence of certain compounds may indicate fraudulent additions committed for eco nomic reasons. Finally, residual or reactivated heat stable enzymes may cause serious storage defects in UHT milk and, therefore, the proteolytic and lipolytic activities and the degree of protein and lipid degradation are useful predictors of the shelf life. Different analytical methods for the determination of the selected quality indicators are also summarized.

Microfabrication of ceramics by rapid prototyping process chains

2003 ◽  
Vol 217 (1) ◽  
pp. 41-51 ◽  
Author(s):  
R Knitter ◽  
W Bauer ◽  
D Göhring
Keyword(s):  
Rapid Prototyping ◽  
Process Chain ◽  
Moulding Process ◽  
Pressure Injection ◽  
Functional Models ◽  
Process Chains ◽  
Ceramic Components ◽  
High Flexibility ◽  
Very High

Most shaping processes for ceramics are based on a powder technological moulding process using a negative mould and subsequent thermal compaction. Especially for prototypes and small-lot series of microcomponents, the outlay for moulds is the major costing factor. Therefore the use of rapid prototyping (RP) processes can decisively reduce the costs and time in product development of ceramic microcomponents. By combining the high resolution of, for example, stereolithography as an inexpensive and fast supply for master models with the high flexibility of low-pressure injection moulding, a rapid prototyping process chain (RPPC) has been established for the fabrication of micropatterned ceramic components as functional models or pre-production lots. This RPPC proved to have a very high moulding precision and accuracy in the submillimetre range, but also enables the fabrication of components with outer dimensions of several centimetres. Different RP techniques were investigated with regard to their suitability to be used as master models in the replication chain. The quality of the master models turned out to be of decisive significance for the quality and reproducibility of the ceramic mouldings.

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