Pro NC wildfire 3 0 tutorial kho tài liệu bách khoa

Pro/NC WILDFIRE 3.0 Figure NC.1 Pro/NC Figure NC.2 Adjustable Guide, Casting, and Machine Part OBJECTIVES • • • • • • • Understand the different models used in manufacturing Merge a design part and a workpiece to create a manufacturing model Implement machining setup elements Understand and set manufacturing parameters Set a tool’s parameters Create tool paths Run simulations of tool paths • Utilize NC Check to analyze NC sequences Pro/NC Pro/NC (Fig NC.1 and NC.2) will create the data necessary to drive an NC machine tool to machine a Pro/E part It does this by providing the tools to let the manufacturing engineer follow a logical sequence of steps to progress from a design model to ASCII CL data files that can be post-processed into NC machine data The following is an overview of terms that will be used throughout this lesson These are basic Pro/NC concepts that are vital to understanding the module Pro/NC (Fig NC.3) is designed to map your manufacturing intent, as captured by the NC sequence parameters, onto geometry selected from the engineering part (design model) Throughout this lesson, the appropriate settings will be described and the techniques displayed to make this mapping clear Figure NC.3 COAch for Pro/E, Milling, Manipulating a Mill Path Design Model The Pro/E design model, representing the finished product, is used as the basis for all manufacturing operations Features, surfaces, and edges are selected on the design model as references for each tool path Referencing the geometry of the design model (Fig NC.4 and Fig NC.5) sets up an associative link between the design model and the workpiece Because of this link, when the design model is changed, all associated manufacturing operations are updated to reflect the change Parts, assemblies, and sheetmetal parts may be used as design models Figure NC.4 Design Part (Hidden Line) Figure NC.5 Design Part (Shaded) Workpiece The workpiece represents the raw stock that is going to be machined by the manufacturing operations Its use is optional in Pro/NC The benefits of using a workpiece include: • • • Automatic definition of extents of machining when creating NC sequences Dynamic material removal simulation and gouge checking (available with Pro/NC-CHECK) In-process documentation by capturing removed material The workpiece can represent any form of raw stock: bar stock, casting (Fig NC.6), etc Copying the design model and modifying the dimensions or deleting/suppressing features to represent the real workpiece may easily create it As a Pro/E part, the workpiece can be manipulated as any other part: it can exist as an instance of a part family table; and it can be modified, redefined, etc Figure NC.6 Workpiece Manufacturing Model A regular manufacturing model consists of a design model (also called a "reference part" because it is used as a reference for creating NC sequences) and a workpiece assembled together (Fig NC.7) As the manufacturing process is developed, the material removal simulation can be performed on the workpiece Generally, at the end of the manufacturing process, the workpiece geometry should be coincident with the geometry of the design model However, material removal is an optional step When a manufacturing model is created, it generally consists of four separate files: • • • • The design model (machine detail info) filename.prt The workpiece (stock or casting detail info) filename.prt The manufacturing model assembly-manufacturename.asm The manufacturing process file-manufacturename.mfg Figure NC.7 Manufacturing Model (Hidden Line and Shading) Part and Assembly Machining There are two separate types of Pro/NC: • • Part machining Acts on the assumption that the manufacturing model contains one reference part and one workpiece (also a part) Multi-part allows you to assemble multiple design models or reference models, but they are automatically merged upon assembly so that the manufacturing model still consists of one reference part and one workpiece (Fig NC.8) Assembly machining No assumptions is made by Pro/E as to the manufacturing model configuration The manufacturing model can be an assembly of any level of complexity (with subassemblies, etc.), and it can contain any number of independent reference models and/or workpieces It can also contain other components that may be part of the manufacturing assembly but have no direct effect on the actual material removal process (e.g., the turntable, clamps, etc.) Once the manufacturing model is created, Part and Assembly machining use similar techniques to develop the manufacturing process If there are specific techniques for defining an NC sequence, they will be described where appropriate Keep in mind that in Part machining, Pro/E automatically determines some of the machining aspects based on the workpiece geometry; therefore, although Assembly machining gives you more flexibility in building the manufacturing model, it may also require extra steps when creating the NC sequences The major difference between Part and Assembly machining is that in Part machining all the components of the manufacturing process (operations, workcells, NC sequences, etc.) are part features that belong to the workpiece, whereas in Assembly machining these are assembly features that belong to the manufacturing assembly Figure NC.8 Adjustable Guide Manufacturing Model CL Data Adj-Guide9.1 Adjustable Guide, Casting and Machine Part ADJUSTABLE GUIDE The Adjustable Guide (Adj-Guide 9.1 and 9.1) is modeled in two stages Model the casting using the casting detail, and then use the machine detail to complete the last (machined) features The last step will be to create a Family Table with an instance that suppresses the machined features By having a casting part (which is called a workpiece in Pro/NC) and a separate but almost identical machined part (which is called a design part in Pro/NC), you can create an operation for machining and an NC sequence During the manufacturing process, you merge the workpiece into the design part and create a manufacturing model Adj-Guide9.1 Adjustable Guide Adjustable Guide The Adjustable Guide casting (Adj-Guide 9.1) is a simple part, so the process of describing systematic commands and tools will start with the creation of the rib The rib, created in the casting model, will have a relation added to it to control its location The relation will keep the rib centered on the rectangular side of the part The rounds are added late in the modeling process, for they can cause the model to fail in many cases The process of fixing the part, so that the rounds not make the regeneration fail, is also described [Adj-Guide 9.2(a) and (b)] Adj-Guide9.2 (a) Manufacturing Model Adj-Guide 9.2(b) NC Sequence and a CL File The difference between the two files is the difference between the volume of the casting part and the volume of the machined part The removed volume can be seen as material removal when you are performing an NC Check operation on the manufacturing model If the machining process gouges the part, the gouge will be displayed as cyan The cutter location (CL) can also be displayed as an animated machining process [Adj-Guide 9.2(b)] Adj-Guide 9.4 Adjustable Guide Casting Drawing Sketch the section in the second quadrant, not in the first quadrant as was done for most of the other lessons Note the location of the coordinate system Pay particular attention to the tangencies Adj-Guide 9.6(c) Sketch Section (Parallel to the Screen) Adj-Guide 9.6(d) Sketch Section Shown in Trimetric Adj-Guide9.6 (e) Depth of First Protrusion Adj-Guide9.6 (f) Dimensions Shown in the Standard Orientation Adj-Guide 9.6(g) Completed Protrusion Model the second protrusion Adj-Guide9.7 (a) Add the Reference Adj-Guide 9.17(b) Sketch One Concentric Circle Adj-Guide 9.7(c) Depth of the Second Protrusion > Close > OK > File > Save > MMB Alternative Machining Projects Casting Cover Casting Cover