Sheet metal development

Long lead item development (sheet metal, HVAC, power train, frame, etc.)8... 

M Huang, JG Gerdeen. Springback of doubly curved developable sheet metal sur-. face—an overview. SAE Technical Paper No. 940938, 1994. 

The tank is typically about sixteen inches in diameter and about four to five feet tall. The top of the tank is domed upward and the bottom of the tank is also domed upward in a concave manner. The outside of the tank is insulated with a polyurethane foam insulation that is squirted into the gap between the tank and a thinner sheet metal jacket. The polyurethane is made of two different components that react and harden when mixed. Included in the mixture is a blowing agent that causes the polyurethane to expand in a foam-like manner. Prior to about 1980, water heaters were insulated with fiberglass insulation. The foam insulation process was developed to allow automation and increased manufacturing speed and reduced costs. A side benefit was improved insulating ability leading to a slight increase in efficiency. 

In an anisotropic material, the properties depend on the direction in which they are tested. For example, rolled metals, which are anisotropic, tend to develop a crystal orientation in the rolling direction. Thus rolled and sheet-metal products have different mechanical properties in the two major directions. Also, extruded plastic film can have different properties in the machine and transverse directions. These materials are oriented biaxi-ally and are anisotropic. (As reviewed above under EXTRUSION, Orientation). 

Two runs at high CO2 concentrations (9.8 mole percent CO2/ N2/5A 1/4" and 13.2 mole percent C02/air/5A 1/8" LMS pellets), for which it was determined that effects of heat transfer could be very important, were run in a special column designed by F. W. Leavitt (developer of the MASC program) to simulate essentially adiabatic behavior. The column was constructed of thin-walled sheet metal and was 24.8 cm in diameter. Electric heating jackets placed in sections along the wall of the column and controlled by thermocouples placed at corresponding intervals along the centerline of the bed were used to maintain the wall at essentially the same temperature as the bed interior. 

The whole process consists of a sequence of consecutive steps which allows separation into production modules. Some of them already exist and will just need slight modifications. Others have to be developed. At the very beginning, one makes use of the newly developed reel-to-reel etching technology for micro structured stainless-steel foils similar to the process described in [166], The structured foils are then coated with catalyst, structured again with a laser tool and finally folded by sheet metal forming to a reactor monolith. The readily mass-produced reactors will be sealed by laser welding. 

Data on zinc and zinc products are available from the American Zinc Institute, Inc., of New York. Market development and promotion pamphlets relating to galvanized sheets, metallic zinc paint, and rolled zinc are available at no cost. Information on slab zinc production and shipments is collected monthly. Data on labor are also assembled, monthly, for the membership only. 

In recent years, the concept of light construction has led to the development of hybrid structural parts. Using parts made of pure plastic runs into repeated difficulties because of the material s low modulus of elasticity, since the only way to compensate for this drawback is to use much thicker structures. Combinations of sheet metal materials with plastics facilitate new solutions that do justice to the concept of lightweight construction and provide new properties at the same time (sound insulation, thermal conductivity, dynamic stability, corrosion protection). The precondition for successful development of such hybrid structural parts is a reliable bond between the two materials. In certain cases, this must be realized by adhesives that are flexible with regard to the a problem (different heat expansion coefficients of the materials), but still provide high strength levels. 

Due to the abrasive grains striking the adherend surfaces with high energy by means of compressed air, surface densification with ensuing development of tension may occur, entailing a deflection, especially in the case of thin adherends (sheet metal up to 2 mm thick). This phenomenon may be avoided by clamping... 

Development of Friction Stir Welding Technique and Machine for Aluminum Sheet Metal Assembly, Paper 2005-01-1254, 2005 SAE World Congress... 

The major key to low cost Is a solar collector design which has low material Intensity and Is capable of being produced at very high speed to reduce labor Intensity. The low material Intensity results from the use of polymer films and film laminates. The development of an efficient non-pressurlzed thin film absorb-er/heat exchanger also contributes to minimum material requirements. The use of a simple roll-formed sheet metal frame with a cost one third that of a conventional extruded frame further reduces the cost and can be produced as one piece to be bent around the Insulating substrate. The weather seals are Integrated Into the fllm/adheslve attachment for simplicity, reliability and very low additional material requirements. 

The main task in this application example was to give specialized engineers a tool for improving the construction and evaluation process with sheet metal forms. The application was developed by Fraunhofer lAO for BMW ... 

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. 

At the end of the nineteenth century, due to the development of the sheet forming technology, sheet metal formability became a research topic. Starting from that time, different tests have been proposed. AH of them are based on the measure of the maximum deformation that a sheet metal sample can reach. 

While in sheet metal forming FLDs are commonly used to evaluate formability, in bulk metal forming some criteria have been developed. 

The development of sheet-metal components ranges from the simple to the extremely complex. Let us consider three simple shapes a cylinder, a cone and a rectangular tray. 

Why is it necessary to calculate the developed length of sheet metal components using the mean line ... 

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