Sheet forming process description

Process description a breakdown of a process into subtasks or steps, expressing the requirements for each step and its relationship to other steps in the recipe. Every process description has an associated active resource that is responsible for planning and executing the process described. Process descriptions come in many forms NC programs, routings, operation sheets, recipes, etc. 

The accuracy of the simulation results is given mainly by the accuracy of the material model. In the last years, the scientific research is oriented in developing of new material models able to describe the material behavior (mainly the anisotropic one) as accurate as possible (Barlat et al. 2004 Banabic 2010 Banabic et al. 2010). The computer simulation of the sheet metal forming processes needs a quantitative description of the plastic anisotropy by the yield locus. 

Banabic D, Sester M (2012) Influence of material models on the accuracy of the sheet forming simulation. Mat Manuf Processes 27 304-308 Banabic D, Aretz H, Comsa DS, Paraianu L (2005) An improved analytical description of orthotropy in metallic sheets. Int J Plasticity 21(3) 493-512 Banabic D, Barlat F, Cazacu O, Kuwabara T (2010) Advances in anisotropy and formability. Int J Mat Forming 3 165-189... 

Complete process description in the form of PFD/P ID, material safety data sheet, existing condition including any modifications carried out, etc., even before starting HAZID study. 

Even, limited PSAs use and contain much information. This information may come as memos and process reports and flow sheets, equipment layout, system descriptions, toxic inventory, hazardous chemical reactions, test, maintenance and operating descriptions. From this, data and analyses are prepared regarding release quantities, doses, equipment reliability, probability of exposure, and the risk to workers, public, and environment. An executive summary analysis is detailed, and recommendations made for risk reduction. Thus the information will be text, calculations of envelope fracture stresses, temperatures, fire propagation, air dispersion, doses, and failure probabilities - primarily in tabular form. 

The final product may take any one of a vast multitude of final forms. These include, but are not limited to, construction materials, toys, automotive parts, kitchen aids, industrial parts, sports and recreational equipment, containers of all sizes and description, and an unlimited variety of packaging products for foods, drugs, cosmetics, and other consumer products. The processes that are used to produce or mold or fabricate the final products are also varied and depend on the design and purpose of the product. Some of these processes include extrusion, compression molding, roto-molding, blow molding, sheeting, and films. 

The adhesive transfer of organic plastics has some special features of it own. Makinson and Tabor [24] observed that polytetrafluoroethylene sliding on glass left transferred material on the counter surface in the form of lumps, ribbons, sheets or very thin films, depending on the rubbing conditions. Pooley and Tabor [25], who studied the transfer process more intensively, also reported the behavior of other polymers such as fluorocarbon copolymers, polyethylene, polypropylene, polystyrene, polymethylmethacrylate and polyvinyl chloride. Descriptions of transfer in relation to wear were reported for PTFE by Tanaka tt ai. [20] and for polyethylene by Miller a.1. [21]... 

Sheet metals and the manufacturing processes to form them into sheet metal parts are simple and cheap. Application of sheet metal parts is still very popular. Parts produced by bending and punching processes require special description of the bends and flat patterns in the model. 

A brief description of the process for forming a sheet of plastic using a positive mold. . . ... 

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