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The decoupled approach The nesting process consists of the assumes that the lofting process has been arranging of flat parts or profile parts completed. Often, For the most part feature information is the objective is to minimize waste, but it lost in the data transfer process.

This could be some other objective as well. Because the problem is quite CNC Nesting code constrained, it has been possible to fully automate nearly all aspects of the process, assuming that all manufacturing Lofted parts requirements are available to the system. The tool path The nesting process has three inputs: the generation must also guarantee that no manufacturing requirements, which idle pass crosses over a previously cut include the definition of the objective of part.

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It machine controllers for cutting. The formats. This is a machine-level product model includes assembly and interface and as such there are always weld information; rules-based generation minor differences between controllers. More processed into a format suitable for a product details may be found at the particular machine. Nevertheless, this supports the nesting of both plates and approach has been widely adopted profiles. Tool path generation is semi- within the shipbuilding industry. A very automated. Parts for nesting are selected small set of nesting software vendors is from the database those parts that match able to support a wide array of cutting the thickness and material of the chosen equipment.

In addition, the nesting raw stock. The operator also has the organization of multiple piece parts ability to group parts and to duplicate resulting in added complexity; but, on parts or groups. The final tool path can the other hand, the limited feature set be generated by defining the piercing and geometric constraints make it a points and the kerf position to be used simpler problem. The upshot is that the for all parts.


It may also be generated current positioning of nesting software sequentially or contour by contour. These systems are typically used by smaller yards. These provided by vendors that specialize in systems are generally functionally the nesting process. The input to these adequate, but they may not scale up to programs is a neutral file representation support the needs of defense of the geometry of each lofted part — shipbuilding. This use at U. The piping system is almost completely Improved integration with ERP specified by the composite curve that represents the piping path.

The The nesting process is interdependent remainder of the product model can be with the shipyard resource planning specified by means of a relatively small processes, including manufacturing number of feature-based attributes. As schedules and material ordering. In these systems. A standard representation some cases the solid model is in addition of scheduling and other resource to the piping product model, but in some planning information would make it systems the solid model is presented easier to integrate the nesting systems instead of the piping product model.

Nesting is Those systems capture a solid model that typically performed nowadays as a batch looks like a piping system, especially in process well in advance of need dates. A the context in which the piping system better integration with ERP systems resides, but they do not represent a true would be an enabler for just-in-time piping product model. The shipbuilding industry has focused Accuracy control most efforts in the area of CAD support for piping systems.

Even the major CAD Nesting systems do not typically vendors now support product modeling maintain the identity of parts in the post- of piping systems. The piping product processed machine code. Nesting model is fairly well understood and, in systems should support the addition of fact, well supported in other industries as more meaningful information onto the well.

The STEP standard for piping cut plates themselves in order to systems originated in the process plant expedite and improve the process of industry and was later adopted and collecting meaningful accuracy control enhanced by the shipbuilding industry.

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With this type of information, it is possible to construct a Manufacturing information for piping manufacturing plan with reasonable systems, as with structures, includes assurance of its productivity. The goal is to develop the machine instructions to State of the art automate the manufacturing process. There are two operations that need to be Today CAM information for piping supported: nesting and bending. Nesting systems is captured and managed in consists of determining the appropriate custom applications at U.

Defense yards already manage, more or The bending operation requires that less, the same of amount of information instructions be generated to drive a pipe- within the piping CAD product model, bending machine. Today these and, in fact, Navy programs have operations can be nearly fully automated successfully exchanged such models in based on the piping product model.

Most important to perform design and manufacturing is the definition of the parameters of the rules checking. After the CAM data is actual machines that will be used for the captured and associated with the CAD cutting and bending. Each machine has product model, it is possible to check for its own constraints and limitations. For hits or other inconsistencies in the example, in the pipe bending process, if manufacturing plan.

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Currently, piping wall thinning. The necessary information, a manufacturing model is manufacturing features for piping often created where the parts are systems should be standardized within modified to account for these added the STEP-NC standards. There is a Navy parameters. The part is modified in the Phase I SBIR that is currently addressing manufacturing model where: it might be this issue.

Each lower level entity applications at each shipyard. Once the must be configuration-managed with standard features for both CAD and respect to its higher level collectors.

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CAM for piping have been agreed to, it Entities may be versioned at each level. The problem is the large rules. The configuration Automated planning management system must be easy enough to use so that users are not A time-consuming step in the tempted to short cut the system. A pipe detail Interference checking represents a unit of manufacture. It is a unit that consists of one bent pipe There is a need for specialized possibly with fittings at one or both interference checking for piping ends or a combination of straight pipes manufacturing.

The pipe bending and fittings that when assembled lie in process is sensitive to hits as the pipe is one plane.

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There are many ways to processed. Conventional CAD systems divide a piping system into pipe details are able to perform static interference and later into assemblies , some more checking on solid geometric models. The costly than others. There is a need for a piping problem is different from this.


On system that can automate this planning the one hand it is a dynamic problem process. The system would have to take since hits occurs at the pipe moves about into account the piping product model, the machine. On the other hand, it is a the manufacturing constraints and simpler problem from a computational requirements, the associated CAM data, geometry perspective. The interference and the costs associated with each problem can be solved as an intersection manufacturing option.

A current SBIR of curves the pipe path and surfaces project is prototyping such a system. PDM capabilities for configuration c. Like the flat plate features separate from each other. The structural manufacturing process, lofting step may include an unrolling manufacturing sheet metal can be step for pieces with curved surfaces.

In some next step is nesting, which is a ways the sheet metal task is simpler.

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There are no bevel configurations to After nesting, NC code may be contend with, so in this respect the generated to drive the cutting and features associated with the edges of the bending machines. There are fewer CAM requirements. While it makes sense to requirements are more demanding than cut and manage steel plate one piece at the requirements of other industries, and time, typically an entire sheet metal this situation is especially severe for assembly is cut and managed as a unit.

Most of CAD model of the finished assembly. As with plate processing, the developed solutions at the shipyards. The typical structural CAD hand, do not fit nicely in the mold of 3D model keeps track of the individual solid modeling. Within the shipbuilding component pieces. This is not the case industry, there are two families of sheet with sheet metal models.

There are a metal products: non-standard, custom- number of ways that a flat sheet can be design shapes and standard shapes that cut and bent to form a box; some of are re-used frequently e. The the constraints of the sheet metal shop. Solid geometry engines do not typically recognize such a constraint. Some surface modelers support the d. Robotic Welding design of developable surfaces, but surface modeling is not in widespread Background use at shipyards. Robotic welding is the process of using There is a better opportunity for a an industrial robot to control the motion feature-based, parametric approach with of an arc, gas nozzle, laser, or other the standard shapes.

Several years ago a welding tip, and any associated wire number of shipyards agreed to a set of feed or sensor equipment during standard ventilation shapes that could be welding. The welding path to be described parametrically.