Stamping processes

Fig. 17 Left AFM-image of TMV particles after transfer onto a silicon wafer surface. Right A cross-section perpendicular to the stripe direction, indicating that the periodicity of the wrinkle-template was preserved in the stamping process. In addition, the height of the TMV particles is compatible with the assumption that individual particles were transferred in the stamping process...

Fig. 18 Scanning electron microscopy image indicating that long-range order is preserved in the stamping process and those mesoscale dimensions can be approached using stamping...

Manufacture. (1) Stamp process. Aluminium foil scrap is put into an iron mortar with rape oil, beef tallow or olive oil etc, crushed by a hammer which moves up and down and then it is sieved. Tlie contents of the mortar are then transferred to a cylindrical drum, to which some lubricant like stearic acid is added, and the drum is then revolved for glazing to take place. (2) Ball mill process. Aluminium scrap or foil is charged into a ball mill with some lubricant or benzine, and crushed. In some cases an inert gas is introduced into the mill in place of benzine. (3) Atomizing process. Melted aluminium is scattered by spraying molten metal in a jet of air to produce fine particles. 

Manufacture. (1) Stamp process. Aluminium foil scrap is put into an... 

The structural template can only be used for one stamping process as it is destroyed in the process. This means that the process cannot be copied even where an identical structural template is used, as a complex process such as embossing with detonation cannot be reproduced in detail. Clever selection and the appropriate positioning of a number of structured templates make it possible to stamp two or... 

Another approach to stamping process monitoring is the measurement of acoustic emissions (AE) (Liang and Domfeld 1990). This technique... 

Regardless of the production process chosen, a thin film of non conducting polymer accumulated at the interface during the molding or stamping process needs to be removed before further use of the bipolar plates. 

The issue is the consistency of parts produced in the stamping process. Tool designers can adjust die configurations now and then in order to come up with stampings that comply with specifications. Usually, they cannot adjust their dies from one coil to another. The real problem is that no two incoming coils are quite the same. They are of slightly different thicknesses, have different shapes, often have different physical characteristics, and generally contain substantial trapped internal stresses. That means that no two coils will run parts that are exactly the same. The problem lies in material inconsistency and not in the dies. 

Going back many years, we saw levelers strictly as machines to make out-of-flat metal flatter. In the stamping process today, we see them as shape control rather than fancy flattening or leveling machines. Shape or flatness control is the issue. Consistency of stamped parts is the result. 

The conventional stamping process, as shown in Fig. 1, requires a single-action press with unidirectional force applied to a workpiece material. The fineblanking process utilizes a triple-action press which exerts three forces on the input material V-ring indenter force, and simultaneously applied cutting force and counterforce. 

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