1 Introduction
UG is a large-scale software of the world's advanced CAD/CAE/CAM integration technology. Its powerful function, using this software for design, can intuitively and accurately reflect the shape and assembly relationship of components, components, and can fully realize the design of product development. The paperless production of technology and manufacturing can make the product design, tooling design and tooling manufacturing work in parallel, which greatly shortens the production cycle, and is very conducive to the design, development and manufacture of new product trials and multi-variety products. During the development of new products, we can check the dimensional interference, calculate the weight and related characteristics in time through the powerful functions, improve the design quality of the products, and have very good guidance for the reasonable arrangement of the complex structure product assembly process and the welding process. Therefore, the software provides a powerful new product development tool for the factory. In the past product design, we mainly used AUTOCAD software. Due to its limited function, 3D modeling has great limitations, and the final effect of the product cannot be well reflected. Users often cannot see accurate 3D modeling, and only after the sample is developed, the product can be confirmed. If the user is not satisfied with the appearance, it is necessary to modify the mold repeatedly, and sometimes even need to abandon the original mold, re-open the mold, and confirm the sample production again. This not only delays the product development cycle, but also increases development costs. The UG software's entity model function can provide users with a solid model of the product for validation during the design phase, shortening the product validation cycle, and a composite modeling tool that allows for addition, deletion, suppression, recovery, when needed. Changing the product parameters makes the modification more flexible. Therefore, it plays a big role in the design and development of the interior components of the cabinet, and is very convenient to use. UG software's wireframe modeling module provides functions for drawing basic pixel points, lines, arcs, curves, and chamfering, cutting, editing, and segmentation of lines. The solid modeling module provides various basic geometric element blocks. Operation and stretching of bodies, cylinders, cones and rings, solid bodies, stitching, drilling, grooving, bosses, shells, rounds, chamfers, frustums, and physical phases of Boolean operations Adding, entity subtraction, entity intersection, etc., the surface modeling module can complete the generation of various regular surfaces, quadric surfaces and irregular surfaces. There are straight lines, scanned surfaces, boundary curve control, and mesh on the concrete implementation of the surface. Various methods such as grid curve control, rectangular point group control, curve stretching, transition surface, extended surface, offset surface, surface rounding, and surface bridging.
2, design basis analysis
There are many ways to design a design for a designer, but there are two different types, one is a plastic part drawing, and the other is a plastic part sample. For the former, pay attention to the technical requirements of the drawings. Many drawings clearly give the gate position and form, the dimensional tolerance level, the unfilled corners, the product wall thickness, etc., which must be taken into account in the design; for the latter, the focus is on Extracting useful mold making information for the sample is used by me to avoid detours in the design (the mold that can produce the sample must have its success), including the position of the parting surface, the positive and negative draft angle The design, the matching products maintain consistent rounded corners, draft angles, and the like.
The plastic components of the cabinet are mainly composed of an upper panel, a lower panel, an air outlet frame, a base, a top cover, an electrical box, a wind direction sheet, etc., and the shapes of the upper and lower panels, the air outlet frame and the base are relatively complicated, and the design needs to be clarified. Ideas, comply with process design specifications, and flexibly use UG operation techniques to optimize the design process and reduce design cycles. Since the cabinet has more plastic parts and the design method is similar, the following is only a detailed discussion of the lower panel as an example. The shape of the lower plate plastic part is shown in Figure 1. The material is ABS (full name acrylonitrile-butadiene-styrene copolymer), the color is milky white, and it is tested by uniform color swatch. After the forming of the workpiece, the surface is smooth and smooth, and there are no appearance defects such as distortion, crack, flow mark and weld line, and the flatness of the U surface is ≥1 mm. Dimensional tolerance is carried out according to GB/T14486-93 standard MT5, wall thickness is 2.8mm, no rounding is R0.5mm, no gate is allowed on the outer surface, and the matching clearance is 0.5mm. Designers must digest the drawings carefully, especially if the dimensions are accurate and complete, whether there are unreleased drafts, tolerance requirements, assembly requirements, etc., as well as plastic parts in terms of appearance, color transparency, and performance. What is the geometric structure, slope, inserts, etc. of the plastic parts, whether the molding defects such as weld lines and shrinkage holes are allowed, whether there are post-processing such as painting, plating, gluing, drilling, etc. In terms of problems, we must get in touch with our customers in a timely manner and eliminate the existing problems one by one. The plastic parts are modeled by UG software for three-dimensional modeling. The whole product modeling takes about 1-2 days (the whole plastic component is completed for about 7-8 days), and special attention should be paid to verifying the whole and the card during the three-dimensional modeling process. The assembly dimensions of the hooks and the draft angle of the mating products are designed to avoid unnecessary errors in the design.
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