Application of UG CAD in Design of Small Gravure Printing Machine

UG Software Introduction

With the development of modern industry and the popularization of computer technology, computer-aided design (CAD) technology has been widely used in the design of packaging and printing machinery. The use of computers has evolved from simple scientific computing to graphic generation, from complex data changes to intuitive The geometric changes, this visual computing technology is the development direction of today's CAD.

The small gravure printing tester is a printing device for checking the printing performance and color of ink. It has the basic functions of a gravure printing machine and can guarantee the printing quality. At the same time, it also has the characteristics of a testing machine, and the structure is simple and compact. The following outlines the computer-aided design of a small gravure tester.

UG software is a three-dimensional parametric software developed by U.S. Unigraphics Solution Company (UGS), which integrates CAD, CAM and CAE functions. It is the most advanced computer-aided design, analysis and manufacturing software in the world and is widely used in aviation. aerospace. Cars, ships. General machinery and electronics industries.

UG CAD, CAM, and CAE systems provide a process-based product design environment that enables seamless integration of data development from design to processing, thereby optimizing the company's product design and manufacturing. UG software's process-driven technology is a key technology for virtual product development. In the process-driven technology environment, all the user's products and accurate data models can be relevant in all aspects of the product development process, thus effectively implementing Concurrent engineering.

UG software not only has powerful solid modeling and surface modeling. Virtual assembly and production of engineering drawings and other design functions, and can be carried out in the design process of finite element analysis, mechanism motion analysis, dynamic analysis and simulation simulation, improve the reliability of the design; at the same time, the available three-dimensional model can be directly generated NC code For product processing. The subsequent processing program supports various types of CNC machine tools. In addition, it provides secondary development language UG/open GRIP, UG/open APl easy to learn, to achieve more features, to facilitate the user to develop a dedicated CAD system. The application of solid modeling module UG is a modeling tool, which provides a variety of modeling methods. When building a part model, you can use basic voxels to create simple entities, or you can use curves. Stretching of sketches. Rotate to create various scanning entities. You can also create features using system-provided features.

The structure of the components of the small gravure printing tester is not complicated, but it is necessary to consider which modeling method is used when modeling, because the physical model created by different modeling methods has different editing performance. For example: To create a three-dimensional model of the plate cylinder axis of a gravure printing machine, for this stepped axis, a basic voxel cylinder can be used to establish the segment by segment, or a segment can be drawn by drawing a circle and stretching it. A basic voxel can be built first, and then it can be built using the boss feature. Among these three modeling methods, the editability of the axis established by the first method is not good. If the length of a certain step in the middle is shortened, the prompt of the update failure will appear, and the third method is convenient from the convenience of modeling. The editability of each parameter is the best. Therefore, the correct modeling method is crucial to the smooth development of the design.

For a part model, although there is no fixed modeling order and modeling method, there are certain rules to follow. Generally, according to the structural characteristics of the parts, first establish a basic voxel or scanning feature as the blank of the part, and then gradually create the hole of the part by referring to the roughing process of the part. Keyway, cavity. Boss. Convex pad and user-defined features, etc. Finally, a rounding is created with reference to the part's finishing process. Chamfer. Thread. Features such as trimming and arrays. Of course, in the modeling process, relevant reference features can be created according to the needs of modeling. The establishment sequence of each feature should be consistent with the processing sequence of the components as much as possible. Basic voxels such as cylinders, blocks, and cones are non-associative features. They are not associated with established geometric objects. Therefore, to ensure the modifiableness of the model, no more than one primitive voxel is created in a part model, and the basic voxels are generally the first feature.

Therefore, when modeling small gravure printing press parts, we must first select the correct modeling method, then determine the reasonable modeling order, and then gradually build the model according to the structural characteristics of the parts.

Application of virtual assembly module

The Assemblv module is used to implement the assembly relationship between parts. It takes a number of model parts created by the modeling module according to the Mating. Align (alignment) and Orient (azimuth) are assembled together to achieve their spatial position. The assembly can determine the spatial position of the part. Reflect the assembly structure of the components and find out their spatial interference. In assembly, the part's geometry is referenced by assembly rather than copied to the assembly. No matter how you edit parts and where you edit them, the entire assembly remains relevant. If a part is modified. The assembly parts that reference it are automatically updated and the latest changes in the parts are reflected.

The uG assembly module can not only quickly combine components into products, but also can refer to other components in the assembly for component design, and can perform gap analysis, weight management and other operations on the assembly model. After the assembly model is generated, an explosion view can be created and introduced into the assembly drawing. At the same time, an assembly schedule can be generated automatically in the assembly drawing and the view can be partially cut out.

In the design of small-scale gravure testing machine, the assembly parts are used to assemble the model parts established in the modeling module according to a certain spatial position relationship. The assembly model is inspected in a timely manner for the existence of design size interference, which will provide the actual assembly with smoothness in the future. Reliable guarantee. The resulting assembly information can be used to easily draw assembly drawings and quickly generate assembly exploded views, saving the time and cost of drawing assembly drawings and parts drawings.

Application of drawing module

The UG drawing module (Drfting) provides automatic view layouts and views. Isotropic view. Partial enlargement. Partial cross-section, automatic (manual) dimensioning, geometric tolerances, roughness conformance, support for CB. Standard Chinese character input, view manual editing, assembly drawing, explosion map, automatic generation of schedules and other tools.

The parts and assembly models of the gravure tester created by the modeling module of UG are referred to the drawing function of UG, and a 2D drawing is quickly generated. Because UG's drawing function is a 2D engineering drawing based on creating a 2D projection of a 3D solid model. Therefore, the engineering drawing is completely associated with the 3D solid model. Any change in the size, shape and position of the solid model will cause the 2D drawing to change in real time. In this way, the time required for the update of the 2D maps is greatly reduced, and the common mistakes of dimensional inconsistency and lost lines in the traditional 2D engineering drawing design can be fundamentally eliminated, thereby ensuring the correctness of the 2D engineering drawings.

in conclusion

The application of UG software to the design of small gravure printing tester gives a new design method. It not only breaks through the limitations of traditional 2D design, but also better embodies and verifies. Improve the designer's design intent, simplify the design process of complex products, reduce product costs, and introduce the appearance, shape, technical performance, and features of future products to users at the time of bidding for products. Bring it to market to make products more competitive. Given the many features of the printing machinery and the superiority of the UG three-dimensional design software, it can be predicted that the UG software will have a broad application prospect in the design and manufacturing of the printing press.