As an advanced product design method, reverse engineering is now paid more and more attention by enterprises in China, and the application of reverse technology is more and more concerned. The engineering concept of Reverse Engineering is to obtain the point cloud data of the surface contour of the product model by three-dimensional digital scanning of the existing product model, and process the point cloud data through professional software to form a three-dimensional mathematical model. For product redesign and CNC machining and structural analysis. It is different from our usual design from 2D sketch design to 3D model design to machining or rapid prototyping, so it is a design method based on solids without mathematical models.
Reverse engineering is widely used in aerospace, automotive, machinery, electronic appliances and molds, toys, medicine, footwear and other industries, its applications are mainly in the following aspects:
1. The design of new parts is mainly used for product modification or copy design.
2. Copying existing parts, reproducing the original design intent, data management and archiving.
3. Quickly generate STL models directly from existing product parts for rapid prototyping (RPM) or mold design.
4. Detection of digital models, deformation analysis, finite element analysis, etc., and comparison with the original design model.
5. Restoration and repair of damaged or worn parts.
However, as an emerging technology, many companies do not understand reverse engineering. They believe that as long as there are 3D measurement or scanning equipment, there is general CAD software to reverse work. In fact, this is not enough. There are many difficulties in the application of reverse engineering that cannot be realized by other common reverse software and CAD software. Reverse engineering must have professional reverse software and process knowledge to complete this complicated work well.
The advantages of professional reverse software over ordinary software are:
1. Ability to optimize and edit measurement data
Because there are many measurement devices that can provide scanning work, reverse software is required to have the ability to read different point cloud data formats generated by most devices. At the same time, because the number of point clouds is very large, there are often hundreds of thousands to tens of millions or even hundreds of millions of points to be processed. This requires reverse software to have efficient computing and editing capabilities for such a large number of point cloud data. It has the function of optimizing the number of point clouds and eliminating bad points under the premise of ensuring the quality of the surface. At the same time, due to the different geometric configurations of the model to be tested and the use of different equipment to achieve different measurement purposes, the difference between the measurement process and the measurement method is determined. This requires reverse software to have the ability to handle these different energy classifications.
2. Ability to optimize and edit triangular models
Due to various reasons such as low precision of measurement equipment, low quality of measurement data, defects or damage to measurement models, there are many holes and defects in the generated STL model, which requires the editing of powerful STL models in reverse software. And optimized processing capabilities to repair and smooth triangular faces within the limits of design tolerances. At the same time, it should also have the Boolean operation and design modeling of the STL model to generate the STL model that conforms to the design, so that it is not necessary to convert into a surface model to carry out the mold design or read by other CAM software to process, because this will greatly Increase workload and reduce work efficiency.
3. Smooth surface generation is difficult to use and skillful
Since the reverse products are often more complex products, the surface structure is complex, and it is often necessary to generate a surface based on B-Spline or NURBS surfaces, and multiple editing operations such as clipping, stitching, rounding transition, smoothing, etc. are required. Therefore, the ability to generate and smooth the surface is strict, and most reverse software can only process the point cloud into a curve, and then convert it to other CAD software to generate the surface by curve facet, so that the generation method is single and the workload is large. It is extremely cumbersome to encounter a complex product, and it is easy to cause large deformation, which makes the generation of the surface largely dependent on the experience of the engineer.
4. Difficulties in integrating with other software systems
   Since many CAD/CAM software does not have reverse function, and common reverse software does not have powerful surface editing capabilities and assembly and output engineering functions, reverse software and cad software must be used together to complete the reverse work, but this It is necessary to frequently convert different software formats into different software in the reverse process, which will inevitably result in the loss of features in the data file, and may even damage the data file, and also make the work more cumbersome and reduce work efficiency. .
In response to the above issues, DELCAM offers a complete professional reverse engineering solution.
DELCAM is a world-renowned CAD/CAM software supplier. Its five major softwares: PowerSHAPE, PowerMILL, CopyCAD, PowerINSPECT, and ArtCAM cover the complete process from 3D design, CNC machining, quality inspection and reverse design. For reverse engineering, the solution for Delcam software is shown in the following figure:
The first is to scan the existing 3D model through the measuring device or scanning device to get the point cloud data, and read it into Copycad. In Copycad, on the one hand, you can generate STL models of triangular patches, which can be quickly molded by outputting STL models into rapid prototyping equipment, or exported to PowerSHAPE for mold design, and can also be exported to PowerMILL for CNC machining. On the other hand, you can generate surfaces in Copycad and export them to PowerSHAPE for 3D design, assembly, mold design and 2D engineering drawings. At the same time, Copycad can also compare and analyze with the prototype 3D CAD model and output an error analysis report. Compare the defects and deformations in the design and production process.
As the world's famous reverse software, CopyCAD has the following features in its reverse work:
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