Design and application of a general purpose die set for use on a hydraulic press

1992 ◽  
Vol 47 (1) ◽  
pp. 49
The Analyst ◽  
2016 ◽  
Vol 141 (1) ◽  
pp. 236-242 ◽  
Author(s):  
Juan A. Aguilar ◽  
Simon. J. Kenwright

We describe the design and application of robust, general-purpose water signal suppression pulse sequences well suited to chemometric work.


2019 ◽  
Vol 22 (2) ◽  
pp. 131-135
Author(s):  
Ahmad Saad Jasim ◽  
Ali Abbar Khleif

An important challenge confronted when using blanking to machine sheet metal is the treatment of the shearing force in demand for great strength and heavy stock. One of the methods used to decrease the force wanted is the increase of a punch shear angle. In this work, experiments were conducted to study the effect of shear angle for blank has a diameter (50 mm) on shear force of a low carbon steel sheet (AISI 1008). Low carbon steel is a very common material used in fabrication of sheet metal components, with thickness of (0.5 mm). Tools used in the blanking tests were one traditional flat end punch and four different bevel sheared rooftop punches, which rooftop punches were compared to. and it (0°, 5°, 10°, 15°, 20°) a punches diameter (49.95 mm) by clearance (0.025mm) for each side , with a blanking speed (500mm/min). A special blanking die set is designed and manufactured and was a blank cut by a hydraulic press whose capacity (20 ton). The results showed that the blanking forces of (AISI 1008) low carbon steel metal could be decreased radically with best bevel punch geometry. Using (10°) shear angle at the punch end, the cutting forces decreased up to (90%) compared to the ones of the traditional flat end tool


Author(s):  
Harun Cuğ ◽  
◽  
Shokri Saleh M. Khalifa ◽  
Hakan Gürün ◽  
◽  
...  

The using of magnesium alloys for industrial sheet metal part production has become increasingly common in recent years. This research aims to characterize the effects of the cutting-edge shapes of the punches on the blanking forces and the sheared edge qualities in the blanking/piercing operations of magnesium alloy sheets. Magnesium sheets (AM60 and AZ61) were produced by casting and rolling processes. AM60 and AZ61 Mg alloys produced by casting were rolled by using two different speeds, 2.5 m/min and 7.5 m/min. Material thickness was adjusted to three mm in the rolling process. Blanking tests were carried out on a die-set and hydraulic press by varying shaped punches. In the experimental studies, flat-ended, concave shaped, and 16° angled punches were used. A loadcell was fixed to the experimental setup to determine the blanking forces. The results showed that the AM60 alloy was more resistant to shearing than the AZ61. The lowest blanking force was obtained by use of the 16° angled punch. It was determined that the using of flat-ended punches for blanking operations was more convenient according to the usage purpose of the parts while all three punches can be used for piercing operations.


2014 ◽  
Vol 217-218 ◽  
pp. 397-404
Author(s):  
S.G. Shabestari ◽  
M.M. Tavakoli ◽  
M. Ghanbari

Al-Si-Fe alloys are a general purpose of die casting alloys, widely used to manufacture automotive parts. Forming this alloy in semi-solid state can eliminate important problems in die casting process. In the present work, low superheat melt was employed to produce modified microstructure and non-dendritic A380 alloy feed stocks. The melt was cast on a cooling slope plate at 615 °C to obtain ingots. Then, ingots are thixoformed using a hydraulic press after heating them at 570 °C for 15 minutes, yielding a microstructure with predominantly α–Al globules, Si particles, and modified β-phase intermetallic compounds. The effect of semi-solid processing on the morphology, size, and distribution of iron-bearing intermetallics was studied. The results of image analysis of the samples showed that by using semi-solid method, the shape factor of α-Al phase improved, and iron containing intermetallics were modified in size and distribution. These changes in the aspect ratio and redistribution of the intermetallics improved the mechanical properties such as hardness of the products.


Author(s):  
Wendell Piez

Markup technologies are very general purpose, as reflects their generality of conception. They become interesting as well as useful as they are applied to accomplish goals in the real world. Since principles of generic declarative markup were first applied to accomplishing publishing-related goals in information management, design and application, 25 or 40 years ago, they have repeatedly demonstrated both their generality – they really do work – and their demand for applicability. Get one thing wrong, or leave it out, and the effort sits on a shelf. Design and deploy it carefully and sensitively, and even an inexpensive initiative can pay dividends for years. These systems become sustainable in the context of the sustainable operations of which they are a part. Decades of experience have shown us how to use declarative markup to sustain publishing operations. Now we have to deal with similar problems of information description, management, reuse across contexts, referencing, tracing, and authentication, only at even larger scales than before, both in size and complexity. This paper proposes some lessons and insights we can bring from our experience with publishing technologies, and suggests how they might be applicable in the growing domain of systems security assurance.


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