Reverse engineering

Reverse engineering is relative to forward engineering. The general product design is based on the purpose and function of the product, the first idea, and then through computer-aided design into drawings, through the manufacturing and final molding production. And what we usually call reverse engineering is based on existing products. And the existing products in kind by laser scanning and point collection and other means to obtain the product of three-dimensional data and spatial geometry, the data obtained through the computer design software designed as a professional design drawings for the manufacturing process. Some also through the method of making models, and as a reverse model, also belong to the scope of reverse engineering. Reverse engineering is not a simple copy and imitation. But the use of relevant tools to analyze the product redesign and other innovative treatment. So that the product showed more excellent performance. Shorten the development cycle of new products, improve design and development efficiency.
Reverse engineering design software

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Reverse engineering is done in computer-aided design, so you must use computer design software currently used more extensive reverse engineering software:
Pro / ENGINEER:

PRO / Engineer Operating Software is a CAD / CAM / CAE integrated 3D software under parametric technology company (PTC) .PRO / Engineer's software is famous for parameterization and is the earliest application of parametric technology. Modeling software occupies an important position in the field, Pro / Engineer as the world of mechanical CAD / CAE / CAM in the field of new standards and recognized by the industry and promotion. It is one of the mainstream CAD / CAM / CAE softwares today, especially in the field of domestic product design.
User guide

User Guide referred to as UG. This is an interactive computer-aided design and computer-aided manufacturing system, it is powerful, you can easily create a variety of complex entities and modeling. It is mainly based on the workstation at the beginning of its birth, but with the development of PC hardware and the rapid growth of individual users, the application on the PC has made rapid growth and has now become a mainstream application in the 3D design of the mold industry.
CATIA

CATIA is the French company Dassault's flagship product development solutions. As an integral part of the PLM Collaborative Solution, it helps manufacturers design their future products and supports the full range of industrial design processes from pre-project phase to design, analyze, simulate, assemble and maintain. Widely used in aerospace, automotive industry, shipbuilding industry, plant design and processing and assembly and other fields.
Solid work

SolidWorks software is the world's first Windows-based 3D CAD system for the aerospace, motorcycle, food, machinery, defense, transportation, tooling, telecommunications, medical equipment, entertainment industry, consumer products and consumer products.
Reverse engineering design process

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3D scanning

Mainly used to scan the shape and structure of the object to obtain the spatial coordinates of the surface of the object. Its important significance lies in the ability to convert the physical three-dimensional information into a digital signal that can be directly processed by a computer, which provides a convenient and quick method for physical digitization. The three-dimensional scanning technology can measure two types of measurement according to whether the measuring probe is in contact with the surface of a part (1) Contact measurement:. According to the different probe can be divided into the trigger and continuous (2) non-contact measurement: According to different principles, can be divided into triangular method, structured light method, computer vision, laser interferometry, laser diffraction, Measurement method, MRI measurement method, ultrasonic method and chromatography method.

data processing

Scanned product appearance data will inevitably lead to data errors, so to the original point cloud data pretreatment, usually go through the following steps:
(1) remove the noise point;
(2) data interpolation
(3) data smoothing;
(4) data smoothing;
(4) point cloud relocation integration.
After obtaining the data of the product, the point data is processed by the reverse engineering software. After the classification of different groups, group separation, point-line surface and entity error, the surface model is rebuilt to generate CAD data for NC processing or RP production . The point cloud data obtained from the 3D scanner is used to create the surface. During the process of creating the surface, the method used in the surface reconstruction should be determined according to the number and accuracy of the measured data points.

Reverse analysis of products

Including two aspects: a macro analysis of the whole object-oriented system and a detailed analysis of individual systems that are part of the object.
Macro analysis
The systematic functions of reverse products are conceptually summed up as four basic aspects of energy, material, information and environment. The purpose of energy analysis is to initially determine a viable energy scheme. Analysis of the original product using the energy source of power, whether other energy alternatives, load characteristics, static and dynamic balance and other issues of solution. Material analysis is to initially determine the shape of the parts, materials, character. Learn its special requirements, such as flame retardant, heat insulation, waterproof, lightweight and so on. Information analysis is the mouth of the system to determine the relevant information acquisition, transmission, processing, adoption, control programs and related technologies. Environmental analysis includes the determination of environmental factors required for the operation of the equipment itself, such as temperature, humidity, dust prevention, explosion proof, antimagnetic and other requirements; as well as the impact of product systems on the environment such as dust, dirt, sewage, Noise and so on.
Detailed analysis
(I) Reverse product design thinking, is the key to clear the secondary design requirements. Grasp the product's design ideas, to identify the fundamental design of the original, is conducive to the pursuit of key technologies. On this basis, we can establish our own innovative design ideas.
(2) the principle of program analysis. Exploring the working principle and composition of the original design features, while further research to achieve the same function of the new principle solution is to achieve product technology innovation important steps. Schematic analysis of the program around the characteristics of the implementation of the system, from the power source, transmission system, measurement system, control system, one by one analysis. And understand the contact between the various ways and receive the day. Check the original product whether there are unsatisfactory problems or conflicts.
(3) structural analysis of different ways of structure, functional assurance measures are also different, followed by the product features are also different; structural analysis should also consider improving performance, reduce costs and improve safety and reliability of the reform and innovation Space.
(4) material analysis. Exploring the chemical composition, structure and surface treatment of the original design parts material, measuring the various physical properties and the main mechanical properties of the material, and determining the material grade and the heat treatment method to select the applicable alternative materials if necessary.
(5) Body Size Analysis When the original product entity or drawing can be obtained, the body size of the part can be directly measured and expressed in drawings; for the case of obtaining only the original product image, the size can be obtained by the perspective method Between the ratio, and then by reference to reverse the original size.
(6) appearance analysis. The basic principles of styling and analysis are practical, economical, aesthetic and user friendly, but first of all ensure that functionality requires process and accuracy analysis. Analyze the adding process of the product and the key process, on this basis, select the reasonable parameters on the art to determine the manufacturing process of the new product; depth analysis of the dimensional accuracy, with the precision, the position accuracy, surface roughness.
(7) Performance analysis and other work on the main performance of the product such as strength, stiffness, accuracy, life expectancy, safety test to be determined to grasp the design requirements and design specifications, but also consider the use of products, maintenance, packaging technology Wait.

Three-dimensional model building

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On the basis of the original product analysis, the reverse engineering software is used to carry out the 3D modeling of the product.
This article summarizes mainly the product reverse and modeling of industrial products, including aerospace, automotive manufacturing and machining.

Source: Baidu Encyclopedia