Reverse engineering technology in the design and manufacture of stripper handle the application model

 

(1 College of Mechanical and Electrical Engineering, Zhejiang University, Hangzhou 310032; 2. Jinhua Jeans licensed vehicles Manufacturing Co., Ltd. Jinhua 321000; 3. Technician College, Jinhua Mold Technology University, Jinhua 321017)

 

Abstract: The application of reverse engineering design and manufacturing process of model stripper handle, focus on solving the stripper handle data acquisition, data processing, CAD digital models handle model reconstruction and rapid manufacturing, indicating that reverse engineering can quickly and efficiently solve Model design and manufacture of application problems for companies to reduce new product development cycles, reduce development costs, and enhance market competitiveness of great significance.

 

Keywords: reverse engineering; stripper handle; model design and manufacturing; CAD digital models

 

CLC: TP391.7 Document code: B Article ID: 1672 - 545X (2010) 05 - 0150 - 02

 

Mould (type) manufacturing technology, the use of traditional methods not only long period, but also by the mold (type) the complexity of the restriction, even if the CAD / CAM is sometimes difficult to achieve [1]. The use of reverse engineering technology, can quickly be transformed into physical prototypes CAD digital models from CAD reconstruction technique, the characteristics of the model parameters can be adjusted and modified to achieve maximum approximation of physical models to CAD digital model as the basis for rapid prototyping and manufacturing (RPM). Using reverse engineering techniques can shorten the product development cycle more than 40% [2], which greatly improved the productivity and reduce the cost of developing research, and enhance market competitiveness of enterprises of great significance.

 

1 Introduction Reverse Engineering

 

Reverse engineering (Reverse Engineering, RE), also known as reverse engineering, reverse engineering [3]. Was developed in the 1980s, data analysis and manufacturing technology, based on the kind of products and equipment, software (drawings, procedures and technical documentation, etc.) or influence (pictures, photos, etc.), etc., as the research object, determine the initial anti- design intent, including shapes, materials, technology, strength, and many other aspects [4]. Reverse engineering of modern coordinate measuring device as a means of detection, and rapid prototyping and manufacturing (RPM), computer-aided design and manufacturing (CAD / CAM) combine to form a closed-loop system design and manufacture products that will effectively improve the rapid manufacturing capabilities [7 ].

 

Three-dimensional data acquisition, data processing, building CAD digital models for reverse engineering of the three key technologies, but also the reverse engineering main content [5]. 2 Based on Reverse Engineering strippers strippers handle model design and manufacture a wide range of applications of electrical tools. The handle is the more important stripper components, wherein the plastic stripper handle samples in Figure 1. 2.1 strippers handle three-dimensional data acquisition in reverse engineering technology, three-dimensional data acquisition is the first link is the data processing , CAD digital model building foundation.

 

(1) measuring equipment. Data acquisition products, generally in two ways: one is the use of conventional measuring tools to measure, such as vernier caliper, micrometer, etc., but this measure can only get the simple dimensions of data, for some fine groove, three-dimensional contour, etc. characterization data can not be measured, but the accuracy is relatively low; other is a laser scanner or the measuring machine for measuring the contact, so that almost any shape can be obtained product appearance and internal data, and its accuracy is relatively high, generally can reach several microns. Stripper handle relatively simple structure, small size, so we chose composite CMM (model BQC654) were measured.

 

(2) measurement method. Stylus point used here for data collection. Positioning of the workpiece before the measurement should pay attention to try and coordinate parallel or perpendicular, measuring point should be consistent with the modeling method, the general outline of the first test retest large main details, and finally rounded corners. After collection point cloud data shown in Figure 2.

 

2.2 Data Processing

 

During the measurement, measurement errors will occur, data loss and other phenomena, in order to ensure the quality of the late model reconstruction, usually on the collected data point cloud processing, such as denoising, data reduction, smoothing processing. Data processing in many ways, here we use special software reverse engineering Imageware, the software provides for the assessment and treatment have been collecting data tool, users can key features and edges to clean up, sampling, filtering, merging, cross-section Interception and size calculation processing. Collected in handling thousands of points, this is especially important.

 

2.2.1 Excluding noise

 

In general, the collected data (point cloud), there will be a number of false positives or no useful purpose in modeling point, we call noise, as shown in the circle of points is obviously a complex point. We need to eliminate these points, there are two main methods: Tap and circle. Tap in Figure 3, and Figure 4 shows the circle of manipulation, removal of the outer side of the other dead pixels.

 

(3) Conflict of physical principles. Physical conflict is a function to achieve a subsystem or component should have a feature, but appeared characteristic opposite to this feature. For example: an airplane wing should have a large area for take-off and landing, but also smaller, in order to adjust flight. This requirement has the size of the area of ​​the wing simultaneously exist, the airfoil design is the physical conflicts. In conclusion, the study of TRIZ method is proposed based on four kinds of physical separation principle to resolve the conflict, namely: spatial separation, time separation, condition-based separation, the separation of whole and part.

 

(4) the determination of the conflict and substance - field analysis. Conflict with respect to technology, physical conflict is sharp conflict, but if we can identify the physical design of the conflict, it was easier to solve. Physical conflict by detailed analysis of the problem, and is determined based on a deep understanding, but also on the existing technology by further analysis to determine the conflict. Identify conflicts of technology, you can use the empirical method, that is, for specific questions by the designer based on experience of the conflict's text description. Conflict of TRIZ techniques identified important tool is the material - field analysis. It uses symbols, graphics design system to be described. TRIZ that all functions of the system, can be represented by two kinds of material and one kind of field of three components. "Substance" is defined broadly, can be complex technical systems or processes, such as automobiles, machine tools; also can be simple objects or parts, such as bearings, screws and so on. "Field" indicates interaction between two objects, the energy required for control, which can be nuclear, electrical, mechanical, magnetic, thermal, etc. Substance - field analysis model shown in Figure 1. Where F is a field, Sl (including the figure S1.1, S1.2), S2 is the material. Sl is the role of the body, S2 is the role of the body (often referred to as tools), field effect through S1 and S2 change Sl. The role of the figure to be the role of the body in a straight line between the arrows, expressed the hope to get a useful effect, and wavy arrow indicates useful to strengthen or improve the effect, while the harmful effects. Through the material - field analysis, a description of the system to be designed to establish model to determine the technical conflict, identify the problem. In fact, the designers took advantage of the above method to solve this problem. The aircraft's fuel tanks are arranged symmetrically within the wing and fuselage fuel tank does not account for the volume, help to improve the aircraft's passenger transport capacity, the aircraft successfully completed a long-distance flight.

 

3 Conclusion

 

Using TRIZ theory and tools that can help designers to overcome the psychological inertia design process, limited knowledge of other factors on the formation of innovative solutions restrictions rapid formation of the concept of innovative programs that are used in an effective tool for the conceptual design phase. But that does not mean there TRIZ theory, there is a universal key. Application of TRIZ theory, should be based on specific research and analysis of specific issues, in TRIZ theory gives the general solution, based on the use of specific knowledge and experience needed to discover a solution. Meanwhile TRIZ theory research and application in our country, but also in its early stages, TRIZ theory own research, the need to further improve their application needs promoting.