ProE Creo 4 modeling Advanced Features.ppt

Editor's Notes

• #4: 0.5 = Elliptical 0.95 = Conic
• #15: The Parameterization Method section of the dialog box is only useful for quilts (not single surfaces). “Automatic” will suffice for most geometries, however, for certain quilts, it might be necessary to approximate the quilt with a single surface. There are two methods to accomplish this: First, the “Aided” parameterization method allows for choosing 4 vertices of the quilt through which Pro/E will place a single surface that approximates the quilt geometry. Second, the “Manual” parameterization method requires a pre-built, approximate, single surface -- it still flattens the quilt, but does so using this approximate surface as a template.
• #19: To define the bend profile, or sectional curvature of the toroid shape, you sketch a chain of entities. The second bend is determined by two parallel planes that define the radius of the toroid. When creating a toroid, the system rotates each of the parallel planes around the intersection of the neutral plane and the end surface by the angle specified. To define the bend, you must select a coordinate system. The X-vector of the coordinate system defines a neutral plane in the bent object. This point does not have to lie on the geometric entity; however, it is recommended for geometric clarity. Note: If the coordinate system does not lie on the profile, the sketched profile must consist of tangent entities. The neutral plane defines the theoretical plane of zero deformation (elongation or compression) along the sectional thickness of the bent material.
• #32: The pipe feature is a three-dimensional centerline that represents the centerline of a pipe. Given the diameter of a pipe (and, for a hollow pipe, the wall thickness), a pipe connects selected datum points either with a combination of straight lines and arcs of specified bend radius, or a spline. After the pipe feature is created, you can determine its length by using Info from the toolbar. Before you start to create a pipe feature, reference datum points must already exist. Click Insert > Advanced > Pipe. The OPTIONS menu appears.   Click one command from each of the following command sets: Geometry—Create a pipe feature with a hollow or solid geometry. No geometry—Create the pipe trajectory only. Hollow—Create a hollow pipe with a specified wall thickness. Solid—Create a pipe with solid geometry (a rod). Constant Rad—The bend radius for all arc segments of the pipe will be the same. Multiple Rad—The bend radius for each arc segment is specified and can be modified separately. Click Done. If you selected Hollow, type the values for the outside diameter and wall thickness. The CONNECT TYPE menu appears. Use the commands on the CONNECT TYPE menu to add, delete, and insert points to redefine a pipe trajectory, as well as specify tangency to a linear trajectory. You can create the pipe trajectory by connecting the datum points. One of the CONNECT TYPE menu commands can be used interchangeably on the same pipe to construct the trajectory. The commands are as follow: Spline—Create the trajectory as a three-dimensional spline passing through the datum points. Single Rad—Create the trajectory by connecting datum points with alternating straight lines and arcs with a constant radius, starting and ending with straight lines. The datum points are connected with straight lines, then the breakpoints are filleted with the arcs of the specified bend radius. Multiple Rad—Create the trajectory by connecting datum points with alternating straight lines and arcs with a variable radius, starting and ending with straight lines. The datum points are connected with straight lines, then the breakpoints are filleted with the arcs of the specified bend radii. You can connect datum points in a datum point array using one of the CONNECT TYPE menu commands: Single Point—Select individual datum points. These points can have been created individually or as part of a datum point array. Whole Array—Connect in consecutive order all the points in a datum point array. You can add, delete, or insert points while creating or redefining the pipe feature using the following commands: Add Point—Add to the definition of the curve an existing point, vertex, or curve end through which the curve will pass. Delete Point—Delete from the definition of the curve an existing point, vertex, or curve end through which the curve currently passes. Insert Point—Insert a point between already selected points, vertices, and curve ends. This modifies the curve definition to pass through the inserted point. The system prompts you to select a point or vertex before which to insert. Use one of the techniques below to complete the creation of the pipe trajectory, depending on the command you chose: Spline—Start picking points; the system connects them with a spline. Single Rad—Pro/ENGINEER prompts you to enter a bend radius value after you have selected the third datum point of the trajectory. The system uses this radius for all the other bends in the current pipe feature. Multiple Rad—Pro/ENGINEER prompts you to enter a radius value for each bend defined by three consecutive points. The SEL VALUE menu lists all the existing radius values for this pipe. Either select one of the listed values, or choose the New Value option and enter the new value. Spline—(alternating with either Single Rad or Multiple Rad)—Create a trajectory for the first option, then the other. Connect the trajectory points accordingly. Note: As you select datum points, the system constructs segments of the pipe feature. If a segment cannot be constructed, Pro/ENGINEER ignores the last datum point selection. When you have finished creating the trajectory, choose Done.
• #39: A lip is constructed by offsetting the mating surface along the selected edges. The edges must form a continuous contour, either open or closed. The top (or bottom) surface of the lip copies the geometry of the mating surface; you can draft the side surface with respect to the lip direction.
• #45: Here we are doing an offset analysis of the selected surfaces. The smaller surfaces are offsetting in the opposite direction. To remedy this select them and use the Flip Normal command.
• #54: Recommendations for using the offset methods: If Norm To Surf fails, use Auto Fit. The Auto Fit method automatically calculates the best directions to translate the surfaces such that they appear as original ones. However, this method does not guarantee a uniform offset normal to surfaces. If the results of Auto Fit are not satisfactory, use Controlled Fit to aid in calculation. It is recommended that you use Auto Fit and Controlled Fit with convex geometry only. These methods involve scaling of geometry. For non-convex geometry, the offset distance may vary.
• #55: Expand is NOT the same as ‘Scale Model’. Often used for over-moldings and forgings
• #59: The edit;solidify menu option contains three options. The first makes a closed volume solid. The second uses a surface to cut a solid. The last is ‘patch.’ Like ‘offset;replace’ a patch can add and subtract geometry in the same feature. But where replace swaps surfaces one for one a patch can add or remove many patches at once. The only restriction is that the boundaries of the surface must lie on solid geometry.
• #62: Some capabilities within either approach can be conceptually similar to the other, but remain anchored to their fundamental approach. While the parametric approach leverages embedded product information to optimize development processes, the explicit approach intentionally limits the amount of information that is captured as part of the model definition in order to have lightweight and flexible product design. CoCreate Advanced Design offers some parametric-like capabilities including: Can the explicit and parametric approaches be combined? No. There is some level of overlap across the two approaches that cause this question to be asked, or prompts competitors offering only one approach to position the combination as the best of both worlds. There are direct modeling capabilities within parametric 3D CAD systems that provide some of the flexibility of the explicit approach, but preserve the defined constraints of the model. Likewise, explicit 3D CAD systems have capabilities to establish and maintain physical relations within a product design, but do not fully define a model’s constraints as in the parametric approach. Neither fully delivers the benefits of the other’s approach. Combining the two approaches together into one 3D CAD system will cancel out the unique benefits of each approach rather than strengthen them. While the parametric approach leverages embedded product information to optimize development processes, the explicit approach intentionally limits the amount of information that is captured as part of the model definition in order to have lightweight and flexible product design. The net result of combining both approaches would be a 3D CAD system that is harder to use (caused by having to learn two modeling approaches) that doesn’t best satisfy anyone’s needs.
• #64: To help visualize the selection process and criteria we’ve created a simple quick gauge to illustrate the trade-offs customers must consider when attempting to determine the best fit methodology. To understand the solution fit, it is necessary to understand how the explicit and parametric design methodologies support the product development requirements. Let’s start by discussing the product strategy. The explicit modeling approach is best suited for the One-off Design in which the goal is to create one-of-a-kind new-to-market or custom design-to-order products. With this product strategy companies place a premium on design speed, supported by the ability to design from scratch or repurpose existing geometry to reach a new, unique product design very quickly. The parametric approach supports the Platform driven design concept, in which designs support the creation of derivative part or product families. The product strategy places a premium on the ability to capture design intent and product behavior, allowing next generation products to be rapidly iterated from the original design concept. Design strategy is the next product development consideration. Explicit modeling supports a Lightweight, Flexible design strategy, allowing users to create designs free from constraints and modeling limitations, thereby allowing designs to be quickly transformed or modified to meet new and shifting requirements. This approach to design ensures radical and unpredictable changes can be easily addressed, leveraging fast, responsive on-the-fly interaction to promote change and rapid exploration of design concepts. The parametric methodology supports a Prescriptive design strategy, in which product design success relies upon the ability to effectively optimize the design, function, and manufacturability of the product. The benefits of prescriptive design are based on the performance improvements made possible by leveraging the power of design optimization. This approach is more applicable to highly engineered components and designs in which product iterations are driven by precise engineering requirements and calculations. Last to consider is the new design cycle length. As you might imagine, the explicit modeling approach is best to address short cycle times on the order of weeks or months. The typical customer faces intense competition and time-to-market pressures, driving the need to create product designs more quickly and with less analysis and optimization of the design. The parametric approach is more applicable to customers facing longer development times on the order of months to years. The typical customer has a longer product development cycle time, based on the requirements to create a highly engineered product which must meet or exceed performance and functional criteria.
• #65: At a high level explicit modeling supports the “just do it” product strategy approach, which is well suited for specialized or “one-off designs”. The fast geometry creation techniques are focused on geometry and design freedom as apposed to features, constraints and design intent. The explicit modeling design strategy is focused on the ability to create “lightweight & flexible” geometry which is drastically different from the rigid, parameter driven, prescriptive approach used by parametric modelers. With explicit modeling the focus is on geometry creation and exploration, allowing the user to change any aspect of a design without regard to how it was designed. The parametric approach is focused on the creation of parameters, constraints and relations to create prescriptive geometry designed to update in a predictable, preconceived manner. New design cycle length is the easiest concept to understand and differentiate. The “just do it” explicit modeling approach is about speed and responsiveness to change, making it the best solution strategy for short cycle times. The parametric approach, on the other hand, is better suited for those organizations and industries whose product development cycle times reflect the need to engineer complex products. Given strict criteria to meet design aesthetics, performance and manufacturing criteria, the added effort and upfront planning is justified to deliver the downstream benefits.
• #70: Internal datums can now be created within the style feature preventing the user from having to leave the feature to perform the task and helps simplify the structure within the model tree. The Pro/ENGINEER WARP feature will provide for universal user defined deformations of selected geometry within a within a 3D marquis. Selected geometry includes facets, curves, surfaces (native and imported), and solids. Functionality includes the ability to dynamically scale, reorient, taper, stretch, bend and twist geometry. The resultant Warp feature behaves like any other Pro/ENGINEER feature, including the ability to make quasi-parametric modifications
• #71: Transform – translate, rotate, scale Warp – taper and warp