Abstract
In order to realize the variant design of the existing product , and rapid completion of the manufacturing and assembly, a new product was designed by reverse design method,and manufactured by rapid prototyping technology to finish assembly with hard material part. An experiment of rapid prototyping part with different model scales assembling with metal part was done to find the right scale of 1.008 of the model in H/h tolerance fit and 0.1mm more in size in interference fit. Through the static theory analysis, the amount of the interference fit was calculated by equal torque in contrast with mechanical assembly.The result was further proved by ProE mechanica simulation for stress and strain. Applying the rule of the results in experiment,prototyping part assembly with hard material part in different types of fit can be realized.
Highlights
With the manufacturing industry from mass production to customized production, product design needs shorten the design cycle,adapt to changing market, and be recognized by the market as soon as possible
The reverse design, known as reverse engineering, is a process that can change 3-dimensional cloud point data obtained by 3D scanning measurement on existing physical model to the STL model, and further parametric transformation into CAD model through reverse design software [1]
Reverse Design.It can make reverse design by Geomagic Studio software on the STL model, that can be converted into CAD model,saved as. iges files or .step files[4].STL is a overall model composed of many triangles that cannot be edited in CAD because of lack of feature parameters of surface.By Geomagic Studio surface parameterization,the STL model can be processed by extracting contour, region division according to surface automatic classification and surface fitting,as shown in Figure 1,and the fitting surfaces can be seamed and converted into CAD model, which can be used in the later stage in CAD software design
Summary
With the manufacturing industry from mass production to customized production, product design needs shorten the design cycle,adapt to changing market, and be recognized by the market as soon as possible. Rapid prototyping can directly convert the design into a physical part, which can be used as a model for customer evaluation of the design, and can be made for functional parts with a certain strength and toughness for the actual assembly. Contraction of prototyping part , material shrinkage rate and filling rate in volume are related, and the relevant calculating formula of the contraction through the experimental data was obtained and reasonable scales about the model in prototyping in different assembly relationship with similar material was put forward. When the rapid prototyping part was used as a functional part,it will necessarily involve with assembly of different materials, such as ABS material and metal material assembly This makes the assembly of rapid prototyping parts with hard material parts become a research topic in considering the material shrinkage and the printed model scale to meet different assembly relationship. Through the experimental analysis, theoretical derivation and simulation verification, the result of rapid prototyping model scale and the assembly relationship was found and can be used as a reference for prototyping part assembly with hard material part,that is the innovation of this paper
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