快速成型的基本理论

Basic theory of rapid prototyping

快速原型设计属于离散/批量原型设计。它从成型原理上提出了一种新的思维模式，即对计算机上制作的零件的三维模型进行网格化存储，并对其进行分层处理，得到截面的二维轮廓信息。每一层的。根据轮廓信息自动生成加工路径，并在控制系统的控制下，成型头选择性地将成型材料逐层固化或切割，形成每一个横截面轮廓板，并逐渐依次叠加成一个三维的毛坯，然后对毛坯进行后处理。，形成零件。

Rapid prototyping belongs to discrete / batch prototyping. It puts forward a new thinking mode from the forming principle, that is, the three-dimensional model of the part made on the computer is meshed and stored, and it is processed in layers to obtain the two-dimensional contour information of the section. On each floor. The processing path is automatically generated according to the contour information, and under the control of the control system, the forming head selectively solidifies or cuts the forming materials layer by layer to form each cross-section contour plate, and gradually superimposes it into a three-dimensional blank, and then carries out post-processing on the blank., Form parts.

快速成型的基本理论过程

Basic theory and process of rapid prototyping

构建产品的3D模型。由于RP系统是由3DCAD模型直接驱动的，因此必须先构建待加工工件的3DCAD模型。3DCAD模型可以使用计算机辅助设计软件（如Pro/E、I-DEAS、SolidWorks、NX等）直接构建，也可以将现有产品的2D图纸转换成3D模型，或者对产品实体进行3D模型。通过激光扫描和CT断层扫描获取点云数据，然后利用逆向工程方法构建3D模型。

Build a 3D model of the product. Since the RP system is directly driven by the 3dcad model, the 3dcad model of the workpiece to be processed must be constructed first. 3dcad model can be built directly by using computer-aided design software (such as Pro / E, I-DEAS, Solidworks, NX, etc.), or convert 2D drawings of existing products into 3D models, or 3D models of product entities. The point cloud data is obtained by laser scanning and CT tomography, and then the 3D model is constructed by reverse engineering method.

3D模型的近似处理。由于产品往往存在一些不规则的自由曲面，因此在处理前应对模型进行近似处理，以方便后续数据处理。由于STL格式文件格式简单实用，已成为快速成型领域的准标准接口文件。它使用一系列小三角形平面来近似原始模型。每个小三角形由3个顶点坐标和一个法向量描述。三角形的大小可根据精度要求选择。STL文件有两种输出形式，二进制代码和ASCII代码。二进制码输出形式占用的空间比ASCII码输出形式要小很多，但是ASCII码输出形式是可以读取和检查的。典型的CAD软件具有STL格式文件的转换和导出功能。

Approximate processing of 3D model. Because there are often some irregular free-form surfaces in products, the model should be approximated before processing to facilitate subsequent data processing. Due to its simple and practical format, STL format file has become a quasi standard interface file in the field of rapid prototyping. It uses a series of small triangular planes to approximate the original model. Each small triangle is described by three vertex coordinates and a normal vector. The size of the triangle can be selected according to the accuracy requirements. STL files have two output forms, binary code and ASCII code. The space occupied by the output form of binary code is much smaller than that of ASCII code, but the output form of ASCII code can be read and checked. Typical CAD software has the function of converting and exporting STL format files.

切片3D模型。根据待加工模型的特点，选择合适的加工方向，在成型高度方向上以一定间隔用一系列平面切割近似模型，从而提取断面的轮廓信息。间距一般为0.05mm0.5mm，常用0.1mm。间隔越小，成型精度越高，但成型时间越长，效率越低，反之，精度低，但效率高。

Slice 3D model. According to the characteristics of the model to be machined, select the appropriate machining direction, and cut the approximate model with a series of planes at a certain interval in the direction of molding height, so as to extract the profile information of the section. The spacing is generally 0.05mm to 0.5mm, usually 0.1mm. The smaller the interval, the higher the forming accuracy, but the longer the forming time, the lower the efficiency. On the contrary, the accuracy is low, but the efficiency is high.

山东快速成型根据切片过程的断面轮廓，在计算机的控制下，根据每个断面轮廓，对应的成型头（激光头或喷嘴）；成型零件的后处理。成型零件从成型系统中取出，并在高温炉中研磨、抛光或后烧结，以进一步提高其强度。

Shandong rapid prototyping according to the section profile of the slicing process, under the control of the computer, according to each section profile, the corresponding forming head (laser head or nozzle); Post treatment of formed parts. The formed parts are removed from the forming system and ground, polished or sintered in a high-temperature furnace to further improve their strength.

快速成型的基本理论以及过程内容便是以上这样了，如果您想了解更多就来网站www.metferro.com进行咨询吧！

The basic theory and process of rapid prototyping are the above. If you want to know more, please visit www.metferro.com Com for consultation!