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When designing a parameterized drawing program for tool parts, the software is typically divided into three main modules: the basic input module, the data processing module, and the drawing module. These modules are developed independently, with each one handling specific tasks. Data exchange between them occurs through input and output parameters, ensuring modularity and ease of maintenance. However, due to the complexity of tool geometry, traditional methods often fall short in achieving accurate and efficient modeling.
To overcome these challenges, ActiveX technology within AutoCAD is utilized to take full advantage of its solid modeling capabilities. A new modeling approach—referred to as the cutting method—is introduced. This method follows a structured process: first, the composite (or blank) is constructed, then it is cut into the embryo body (semi-finished product), and finally, the complete product (finished part) is formed. The cutting method is essentially a modeling technique inspired by advanced manufacturing processes, aligning closely with the actual machining procedures used by manufacturers like Boshan Water Pump Company.
In practice, the AcadLWPolyline object is created based on the bottom parameters of the cutter head. Using the AddLightWeightPolyline method, the blade profile is generated. Then, the Acad3Dsolid object is called, and the cutter head blank A is extruded using the AddExtrudedSolid method. The user coordinate system is set at the tool tip point, with the XY plane representing the rake face. The model is then cut along the XY plane to form cut A and cut B. Next, the XY plane is reset to represent the flank face, and cuts C, D, and G are made accordingly. Finally, the user coordinate system is returned to the original position, and the blade blanks E and F are created in a similar manner. The difference operation is then applied to generate the final blade head body H (semi-finished product).
For the structural model of the tool clamping part, further processing is required depending on the specific clamping method used for the turning tool. Since the surfaces involved are usually complex spatial surfaces, the modeling is achieved through relative motion between the tool and the workpiece, which is essentially a difference operation. Therefore, when constructing the solid model of this part, programming loops are implemented to handle repetitive tasks efficiently, ensuring accuracy and consistency throughout the design process.