Automated lay

In the automated lay-up system, each layer of veneer (with exception of the top surface veneer) passes under an automatic adhesive appHcation system. This may be a spray appHcation, a curtain coater, or an extmder, each of which is designed to apply a uniform adhesive spread on the upper face of each veneer. After all except the top veneer have been spread with adhesive and laid together, the top veneer is added. The me of the veneer—adhesive assembly at this point should be about 8%. 

Automated lay-up there are numerous degrees of automation with more or less complex machines. 

Figure 5.6 Automated laying of degradable mulching film...

Cost at scale Ceramic processing typically involves high tanperatures, which requires expensive furnaces. Automation, lay-up, SCTeen printing, tape casting, and laser machining have all been considered. 

Bounsaythip, C., Maouche, S. and Neus, M., 1995. Evolutionary search techniques application in automated lay-planning optimization problem. In Proceedings of the IEEE Conference on SMC, pp. 4497 502. 

In addition to any cost savings for long production runs, there are two key quality assurance factors that favor the use of automated lay. These are the greatly reduced chance that release paper or film could be retained, which would destroy shear and compressive strength if undetected, and the reduced probability of the addition or loss of a single ply that could cause warping because of the laminate s lack of symmetry and balance. New automated layup machines have a laser ply mapping accessory that can verily the position of the surface ply. 

Depending on the differences nsed in the application methods of layers and curing details, there are different open mould processes (such as hand lay-np, spray-np, automated laying... 

The only other alternative for automated lay-up of compoimd curvatures is fiber placement, which lays individual tows on the part. 

Development of an Automated Lay-Up System for Monofilament Fiber Stmctures. Report per Contract No. DAAJ01-70-C-0049 (PIG) by Boeing Vertol Co. for Army Aviation Systems Conunand, St. Louis, 1977. 

Fig. 8-67 Automated-integrated RP vacuum lay-up process that use prepreg sheets that are in the B-stage.

Spray-Up. Instead of hand lay-up, continuous glass roving and liquid resin are fed into a gun, which chops the glass fiber, mixes it with the resin, and sprays it into the mold. This can be automated for lower labor cost and greater uniformity. Spraying is often followed by hand-rolling to expel air and density the assembly. Then it is allowed to stand until cured. Products are similar to those from simple hand lay-up. 

Many of the technical issues involved in computer-aided model-construction have previously been reviewed by Tomlin et al. (1997). Several researchers, most notably Bozzelli, have extended Benson s method for estimating molecular thermochemistry using quantum chemistry (Lay and Bozzelli, 1997a, b Lay et al., 1995). Sumathi and Green (2002) have discussed how quantum chemistry can supplement experiments in developing rate estimation. Matheu et al. have shown how to automate the computation of rates of chemically-activated (pressure-dependent) reactions (Matheu, 2003 Matheu et al., 2003a, b). Here we focus on a few issues which have not been so thoroughly discussed in the literature ... 

Figure 5.1 7 Automated-integrated RP vacuum hand lay-up process that usesTS polyester prepreg sheets...

The mold is prepared as for hand lay-up but the resin and reinforcement are applied either by spray gun, which can be operated manually or by robot. This gives a more reproducible process, with greater control over the amount of each material that is deposited, opening the way to complete automation. The process has been a popular system... 

USA by Raytheon, following the success of its all composite turboprop, Starship. Called Premier 1, the business jet has an all RP fuselage with metal alloy wing. The carbon fiber/epoxy honeycomb fuselage is produced by computer-controlled automated machines, which are quicker than the hand lay-up used for the Starship. The cabin is reported to be 178 mm higher and 203 mm wider than competitors. The construction saves weight and is stronger than alnminnm. 

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