Stamped metal parts

Figure 6 Parts and Their Sketching Abstractions, (a) Examples of stamping parts, (b) Parts-sketching abstraction that facilitates manufacturability evaluation in conceptual design. (Reprinted from Robotics and Computer-Integrated Manufacturing, Vol. 13, No. 3, A. Mukherjee and C. R. Liu, Conceptual Design, Manufacturability Evaluation and Preliminary Process Planning Using Function-Form Relationships in Stamped Metal Parts, p. 258, Copyright 1997, with permission from Elesevier Science)...

The process was previously used for ehlorine compounds represented by perchloroethylene and trichloroethylene and for fluorine compounds used for cleaning of press stamped metal parts. However, these compounds are now prohibited for use and production by environmental regulations. The current replacements include emulsions, organic and inorganic solutions, etc. Cycloparafiins originating from petroleum products were quali-... 

Some machines have dmms that rotate. After creating stamped metal parts in presses, the parts often go into a drum that rotates. Some call the machine a tumbler. Someone then adds small pellets, called shot. When the shot and parts mmble in the drum, the shot removes burrs and smooths the surfaces of the parts. These tumblers are noisy. However, covering the outside of the drum with foam and lining the inside with resilient mbber materials will reduce the noise generated. 

In metal stamping of parts that are to be subsequently press formed, straight edges shorrld be specified, if possible, on the flat blanks. 

Our team charter had defined our boundaries, so we started with a flat sheet metal part that has already been stamped from coil stock at a preceding operation. The team s first stop was a machine that bent up all four edges of the blank sheet metal to form a pan. What the team observed was that the parts were brought to this machine in a container that required the operator to bend over to retrieve the vertically stacked parts. The operator also had to pry apart the sheet metal pieces with his fingertips before he lifted them from the container. The oil that had accumulated on the parts from the previous stamping operation caused the parts to stick together. The... 

Fig. 14.18 Selection of different sealing technologies [75], (a) The membrane itself is used as seal between the bipolar plates, (b) A separate elastomeric seal is in direct contact with the electrolyte membrane, (c) An inert sheet (subgasket) is to serve as a seal and membrane protection, (d) Use of a subgasket with additional elestomeric seal, (e) A sealing frame is molded to the MEA. (f) The sealing frame partly penetrates into the GDL. (g) The MEA is permanently bonded to the bipolar plate, (h) A metal bead coated with a thin layer of elastomer using a stamped metal sheet...

ZT Zhang, D Lee. Springback Analysis and Control in Forming Two-Step Rail-Stamped Sheet Metal Parts. SAE Technical Paper 960596, 1996. 

Plastic parts can be molded with much greater complexity than is achievable with cast, forged or stamped metals. Thus, components that were assemblies of many metal parts can be molded as one plastic piece. This saves assembly, which is costly in fasteners and man-power. This is a major reason for the conversion from metals to plastics by the automobile industry. 

Conventional thermoforming of sheet and film is appHcable to the production of skylights, radomes, signs, curved wiadshields, prototype production of body parts for automobiles, skimohiles, boats, etc. Because BPA polycarbonate is malleable, it can be cold-formed like metal, and may be cold-roUed, stamped, or forged. 

Cladding may be less expensive than selective electro deposition when coatings greater than 1 p.m of a noble metal are required, but may be more expensive than electro deposition for thinner coatings. Selective techniques are most easily used for sheet metal substrates that are to be machine stamped and formed into contacts. Clad noble metals are considerably more ductile (and less hard) than comparable electro deposits and, therefore, are better suited to forming operations. Contacts that are made into separate parts from rod by screw machining are usually coated on all exposed surfaces by barrel electroplating. 

Metal Preparation. Sheet-steel parts are formed by stamping, bending, and shearing. Many parts require welding (qv), which needs to be carried out in a uniform, smooth manner so that the welded joint can be enameled without defects. Cast-iron parts are formed by the usual cast-iron foundry methods however, additional care is given to prevent contamination of the surface. Surface contamination causes defects in the enamel, particularly bUsters and bubbles. Aluminum metal can be formed in sheets, extmsions, and as castings. 

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