Application of Reverse Engineering Technology in Mold Manufacturing

First, the content of reverse engineering technology and its application range

With the development of computer technology, CAD technology has become an important tool for product designers to carry out research and development. The three-dimensional modeling technology has been widely used in manufacturing and product design, program review, automated processing, manufacturing and management. In the actual development and manufacturing process, the technical data received by the designer may be a three-dimensional model of various data types, but in many cases, the physical model of the product is obtained from the upstream manufacturer. Designers need to transform these physical information into CAD models in a certain way, which is applied to Reverse Engineering.

The so-called reverse engineering technology refers to the process of measuring a physical object or a model by a certain measuring means, and reconstructing a physical CAD model by a three-dimensional geometric modeling method according to the measured data.

Reverse engineering technology is very different from traditional forward design. Reverse engineering starts with the prototype of the product and obtains a three-dimensional digital model of the product, enabling it to be further processed using advanced technologies such as CAD/ACE/CAM and CIMS. The difference from the traditional design method is that the starting point of the design is different, and the corresponding design freedom and design requirements are also different.

In general, product reverse engineering includes several aspects such as shape reversal, process reversal and material reversal. In practical applications in the industrial field, it mainly includes the following contents:

(1) The design of new parts is mainly used for product modification or profiling.
(2) Copying of existing parts and reproducing the original design intent of the original product.
(3) Reduction of damaged or worn parts.
(4) Detection of digital models, such as testing deformation analysis of products, welding quality, etc., and comparing models.

Reverse engineering technology provides excellent technical support for rapid design and manufacturing, and it has become one of the important and simple ways of information transmission in manufacturing.

Second, the conditions for the implementation of reverse engineering technology

1. Hardware conditions for reverse engineering implementation

In the design of reverse engineering technology, it is necessary to extract three-dimensional data information from the design object. The development of detection equipment provides hardware conditions for the acquisition of three-dimensional information of products. At present, domestic manufacturers use a large number of coordinate measuring machines and three-dimensional scanners produced in the United Kingdom, Italy, Germany, Japan and other countries. As far as the principle of the probe structure is concerned, it can be divided into contact type and non-contact type. Among them, the contact type probe can be further divided into two types: a hard probe and a soft probe. The probe is directly related to the object to be measured. Contact and get data information. Non-contact probes are based on the principles of optics and lasers. In recent years, scanning equipment has developed greatly. For example, Renishaw's CYCLON2 high-speed scanner can exchange laser probes and contact scanners. The laser probe has a scanning accuracy of 0.05mm and the contact scanning probe has an accuracy of 0.02mm. Scans fragile, deformable shapes and fine patterns. The GOS company's ATOS scanner can move around the measured object at will, and use the optical tape to obtain the physical surface data through the data image processor. The scanning range can reach 8m×8m. ATOS scanning is not only suitable for scanning complex contours, but also for modeling the interior and exterior parts of automobiles and motorcycles. In addition, Japan's Roland's PIX-30 dot-contact scanner, the British Taylor Hobson's TALYSCAN 150 multi-sensor scanner, etc., embodies the characteristics of high-speed, low-cost and functional composite of detection equipment. In order to realize the integration of physical objects - the establishment of mathematical models - CAD / CAE / CAM provides good hardware conditions.

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