Application of CAD to Maximising DIE Life Based on the Estimation of Working Stresses

1986 ◽  
pp. 433-436 ◽  
Author(s):  
T. Hirai ◽  
T. Katayama ◽  
K. Akamatsu ◽  
J. B. Hawkyard
Keyword(s):  
Die Life

Stellt Übergewicht ein Risiko für die Entwicklung von Asthma bronchiale im Kindes- und Jugendalter dar?

2016 ◽  
Vol 10 (02) ◽  
pp. 88-92
Author(s):  
M. Gramß ◽  
A. Hiemisch ◽  
W. Kiess
Keyword(s):  
Asthma Bronchiale ◽  
Sozioökonomische Faktoren ◽  
Bronchiale Hyperreagibilität ◽  
Die Life ◽  
Skin Prick Tests

ZusammenfassungIn den letzten beiden Jahrzehnten stiegen die Prävalenzen von Asthma bronchiale und Übergewicht parallel an. Für beide Erkrankungen werden ähnliche Ursachen diskutiert: umweltbezogene, genetische, sozioökonomische Faktoren und sogar die Einflussnahme durch Adipokine. Außerdem rückte das Übergewicht als potenzieller Auslöser und begünstigender Faktor von Asthma bronchiale in den Fokus der Forschung. Der BMI ist sowohl mit der Diagnose Asthma als auch mit dem Symptom „wheezing” positiv korreliert. Übergewichtige Kinder weisen größere IgESpiegel und häufiger Atopien auf. Jedoch zeigen Kinder mit größerem BMI häufiger nichtatopisches als atopisches Asthma bronchiale. Zudem sind allergische Tests wie bronchiale Hyperreagibilität und Skin Prick Tests bei adipösen Kindern nicht häufiger positiv als bei normalgewichtigen Kindern. Die Lungenfunktionswerte bei Übergewicht werden häufig als Minderung des Tiffeneau-Index (FEV1/FVK) beschrieben. Allerdings ist auch hier der Zusammenhang noch unklar, vor allem die Reaktion adipöser Kinder auf medikamentöse Broncholyse als Bestandteil der Spirometrie-Testung. Die nicht durchgängig einheitlichen und teilweise nicht signifikanten Studienergebnisse lassen daher nicht auf eine unmittelbare Verbindung von Asthma und Adipositas oder auf den Einfluss von Kovariablen auf deren Verhältnis schließen. Die LIFE Child-Kohorte soll zur Klärung offener Fragen beitragen.

Improvement of die life with surface texture control and solid lubricant

2012 ◽  
Vol 67 (2) ◽  
pp. 153-157 ◽  
Author(s):  
O. Furukimi ◽  
M. Aramaki ◽  
K. Abe ◽  
H. Fukaura ◽  
N. Yamada
Keyword(s):  
Surface Texture ◽  
Solid Lubricant ◽  
Die Life

MUSTANG-LC

Alloy Digest ◽  
1967 ◽  
Vol 16 (4) ◽  
Keyword(s):  
Physical Properties ◽  
High Speed ◽  
High Speed Steel ◽  
Hot Extrusion ◽  
Heat Treating ◽  
Hot Forming ◽  
Steel Company ◽  
Extrusion Dies ◽  
Die Life

Abstract Mustang-LC is a tungsten-molybdenum high-speed steel specially developed for hot work applications requiring long die life. It is recommended for hot forming and swaging dies, hot extrusion dies, hot punches, etc. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-192. Producer or source: Jessop Steel Company.

scholarly journals On the Use of Conformal Cooling in High-Pressure Die-Casting and Semisolid Casting

Technologies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 39
Author(s):  
Anders E. W. Jarfors ◽  
Ruslan Sevastopol ◽  
Karamchedu Seshendra ◽  
Qing Zhang ◽  
Jacob Steggo ◽  
...  
Keyword(s):  
High Pressure ◽  
Die Casting ◽  
Life Extension ◽  
Conformal Cooling ◽  
High Pressure Die Casting ◽  
Cooling Channels ◽  
Die Life ◽  
Die Materials ◽  
Pressure Die Casting ◽  
Semisolid Casting

Today, tool life in high pressure die casting (HPDC) is of growing interest. A common agreement is that die life is primarily decided by the thermal load and temperature gradients in the die materials. Conformal cooling with the growth of additive manufacturing has raised interest as a means of extending die life. In the current paper, conformal cooling channels’ performance and effect on the thermal cycle in high-pressure die casting and rheocasting are investigated for conventional HPDC and semisolid processing. It was found that conformal cooling aids die temperature reduction, and the use of die spray may be reduced and support the die-life extension. For the die filling, the increased temperature was possibly counterproductive. Instead, it was found that the main focus for conformal cooling should be focused to manage temperature around the in-let bushing and possibly the runner system. Due to the possible higher inlet pressures for semisolid casting, particular benefits could be seen.

Investigations on the Effect of Coating Material and Method on Die Wear in Stamping of Advanced High Strength Steels

2013 ◽  
Author(s):  
Ömer Necati Cora ◽  
Muammer Koç ◽  
Peter J. Blau ◽  
Kunio Namiki
Keyword(s):  
Wear Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Test Method ◽  
Coating Materials ◽  
Advanced High Strength Steels ◽  
Die Wear ◽  
Die Life ◽  
Metalworking Industry ◽  
Width Measurements

Despite the advantages of advanced high strength steels (AHSS), their stamping into functional lightweight parts demands prolonged die life, which necessitates the use of alternative substrates, coating materials, and/or surface conditioning to minimize and delay the die wear. In order to avoid frequent die replacement and surface quality problems on the stamped parts, the metalworking industry has been investigating various approaches such as reducing/refining the carbide particles, adding alloying elements, and elevating the hardness and toughness values for both substrate materials and coatings. The objective of this work was to investigate the effects of different coatings on the wear behavior of a some selected tool steel materials (die sample of interest) against two different AHSS sheet blanks through a cylinder-on-flat type reciprocating test method. After wear tests, both die sample and sheet blank surface were microscopically examined. Wear resistance of the slider was quantified from wear scar width measurements. Results showed that TD and CVD coated die samples performed better than the two other PVD coated samples.

Repairing Automotive Dies With Directed Energy Deposition: Industrial Application and Life Cycle Analysis

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Jennifer Bennett ◽  
Daniel Garcia ◽  
Marie Kendrick ◽  
Travis Hartman ◽  
Gregory Hyatt ◽  
...  
Keyword(s):  
Life Cycle ◽  
Environmental Impacts ◽  
Energy Deposition ◽  
Repair Process ◽  
Directed Energy Deposition ◽  
Die Life ◽  
Hybrid Repair ◽  
Directed Energy ◽  
Number Of Cycles ◽  
Manufacturing Technologies

Powder-based additive manufacturing technologies are developing rapidly. To assess their applicability, comparison of performance and environmental impacts between additive technologies and conventional techniques must be performed. Toyota manufactures over two million aluminum four-cylinder engines in the U.S. each year via die casting. The dies used in this process are traditionally repaired via tungsten inert gas (TIG) welding and only last an average of 20.8% of the number of cycles of the original die life before another repair is needed. A hybrid repair process involving machining away the damaged areas and then rebuilding them additively via powder-blown directed energy deposition (DED) has been developed. The die repaired via DED resulted in the same life as the original die. The use of DED repair eliminated the need for emergency repairs and nonscheduled downtime on the line because the DED repaired dies last for as many cycles as the original die before another repair is needed. Life cycle analyses were conducted comparing the traditional welding repair process to the DED repair process. The results show that the DED repair process results in significantly less damage to the assessed impact categories except for ionizing radiation. Therefore, it can be concluded that the DED repair process could lessen most environmental impacts compared to traditional welding repair. Further work toward increasing energy and material efficiencies of the method could yield further reductions in environmental impacts.

Finite Element Analysis of the Forging Process for Half-Shaft Bushing

2009 ◽  
Vol 16-19 ◽  
pp. 1248-1252
Author(s):  
Chun Dong Zhu ◽  
Man Chun Zhang ◽  
Lin Hua
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Calculation ◽  
Two Dimensional ◽  
Element Analysis ◽  
Forging Process ◽  
Die Life ◽  
Dimensional Finite Element ◽  
Forging Force

As an important forged part of an automobile, the inner hole of the half-shaft bushing must be formed directly. However, the process requires many steps, and how the forging, or deformation, is spread over the production steps directly affects the die life and forging force required. In this paper, the three steps involved in directly forging a half shaft bushing's inner hole are simulated using the two-dimensional finite element method. Further more, we improve the forging process. From numerical calculation, the improved necessary forging force is found to be only half the original force, and the die life is doubled.

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