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随着塑料工业的飞速发展和通用塑料与工程塑料在强度和精度等方面的不断提高,塑料制品的应用范围也在不断扩大,如:家用电器、仪器仪表、建筑器材、汽车工业、日用五金等众多领域,塑料制品所占的比例正迅猛增加。由于在工业产品中一个设计合理的塑料件往往能代替多个传统金属结构件,加上利用工程塑料特有的性质,可以一次成型非常复杂的形状,并且还能设计成卡装结构,成倍地减少整个产品中的各种紧固件,大大地降低金属材料消耗量和加工及装配结构,成倍地减少整个产品中塑料化的趋势不断上升。而“L“形塑料螺纹接头就是典型的一种,其结构尺寸存在一定的约束关系且其造型较复杂,而且要对螺纹两端的高度和角度收尾,有必要对其进行讨论。模型制作步骤如下: (1)建立轮廓控制线先以草绘的形式建立两端面,单击娜图标,选择【草绘】,以草绘方式绘制轮廓线,如图l所示。(2)建立轮廓曲面先以混合曲面的形式建立两端面,第一方向选择内轮廓控制线,第二方向选择内轮廓两端面的边界线,完成内轮廓曲面,操作流程为:单击【特征】、【创建】、【曲面】、【新建】、【高级】、【完成】、【边界】、【完成」、【混合曲面」;以同样方法制作外轮廓曲面,在第一方向选择外轮廓控制线,第二方向选择外轮廓两端面的边界线,再将?
With the rapid development of the plastics industry and the ever-increasing strength and precision of general plastics and engineering plastics, the application of plastic products is also expanding, such as: household appliances, instrumentation, construction equipment, automotive industry, household hardware And many other areas, the proportion of plastic products is rapidly increasing. As a well-designed plastic parts in industrial products can often replace a number of traditional metal structures, combined with the unique properties of engineering plastics can be a one-time molding complex shapes, and can also be designed into the card structure, exponentially Reduce the entire product of a variety of fasteners, greatly reducing the consumption of metal materials and processing and assembly structure, reducing the plasticization of the entire product is on the rise. However, the “L” shaped plastic threaded joint is a typical one, and its structural dimensions are constrained and its shape is complicated. Moreover, it is necessary to discuss the height and angle of both ends of the threaded end. Model making steps are as follows: (1) the establishment of contour control line to create a sketch of the two ends of the first surface, click the Na icon, select [Sketch] to draw the sketch outline, as shown in Figure l. (2) Establish contours and surfaces Set up two end surfaces in the form of mixed surfaces, select the inner contour control line in the first direction, and select the boundary line between the two end surfaces of the inner contour in the second direction to complete the inner contour surface. The operation flow is as follows: ], [Create], [Surface], [New], [Advanced], [Finish], [Boundary], [Finish], [Mixed Surfaces]; in the same way, the outer contour surface is selected and the outer contour is selected in the first direction Control line, the second direction to select the outer contour of the two ends of the border line, and then?