Epoxy resin is a kind of polymer material with high performance. It is a two-component system composed of epoxy group and amine group, which forms polymer compound by mixing and reaction. It has strong adhesive force, corrosion resistance, heat resistance, electrical insulation and mechanical strength, and is widely used in aviation, aerospace, automotive, construction, electronics, ships and other fields. Epoxy Resins,Crystal Clear Epoxy Resin,Hardener Epoxy Resin,Liquid Epoxy Resin Shanghai Shengduan Trading Co., Ltd. , https://www.sdcuringagent.com
2 ActiveXAutomation technology overview The third layer is the collection object under the Document object. In the actual application, the fourth layer of various graphic and non-graphic objects are manipulated through the collection of Modelspace and PaperSpace objects contained in it. We can generate and access all the entities in the current drawing. Enter the corresponding generation in the generic main code window, call submain where needed, and call AutoCAD.
3 Three-dimensional modeling in the gear precision forging expert system In the development of the gear precision forging expert system, it is necessary to complete the meshing demonstration of a pair of straight bevel gears, considering that the two-dimensional graphics processing in the system is realized by ActiveXAutomation technology, and the powerful AutoCAD itself has The three-dimensional modeling function can also be controlled by VB through the object model exposed to VB, so the gear meshing shape is still completed on the basis of the technology, and then the main program controls the output of the graphic to realize animation. The code for layering, setting line types, drawing lines, and changing line types is similar to 2D graphics processing, which is described in detail in the literature, and is mainly for 3D graphics. The core program section is as follows.
The geometric model of the bevel gear can be thought of as a series of teeth on the surface of the frustum, so a cone-shaped body with a hole in the middle is first generated by Boolean operation.
Since the entities generated by the above methods are defined as Objects in the program, they have their own original properties and methods, so we can easily edit the graphics through these properties and methods, such as changing the line type, color, and label. Dimensions, as well as entities to move, rotate, mirror, etc.
4 Conclusion The practice proves that the use of ActiveXAutomation technology in the mold CAD system can not only complete the two-dimensional graphics processing well, but also effectively realize the three-dimensional modeling, the interface is simple to write, and the original powerful graphics processing functions of AutoCAD can be fully utilized. By looking at the AutoCAD object model, programmers can grasp the objects and their supported properties and methods in a comprehensive way, and intuitively understand and use all the functions provided by AutoCAD. Combine it with the core program to make the CAD application software code more concise, more convenient to operate, and more powerful. This method is suitable for mechanical CAD system design, and can also be extended to other CAD system design.
The preparation process of epoxy resin is to mix epoxy resin monomer and amine Curing Agent in a certain proportion, and react at a certain temperature to form a polymer compound. Epoxy resins with different properties can be obtained by changing the type of monomer, the type and proportion of curing agent.
The advantage of epoxy resin is that its properties can be adjusted according to needs, and materials with high strength, high stiffness, high toughness, high temperature resistance, corrosion resistance and other characteristics can be prepared. Because of its excellent properties, epoxy resins are widely used in various fields. For example, in the aerospace field, epoxy resins are used in the manufacture of aircraft and rocket structural parts, composites, coatings and adhesives; In the automotive field, epoxy resins are used in the production of automobile body and engine parts; In the field of construction, epoxy resins are used in coatings, floors, waterproof materials and so on.
In addition, carbon fiber reinforced epoxy resin composites are also one of the most widely used epoxy resin products at present. Carbon fiber reinforced epoxy resin composites have the advantages of high strength, high modulus and low density, and are widely used in aviation, aerospace, automobile, sporting goods and other fields.
In general, epoxy resin is a high-performance material with a wide range of application prospects, and its properties can be adjusted according to needs, and it is widely used in various fields.
Three-dimensional exploration on the accuracy of gear technology
1AutoCAD and VB connection This object has its original properties and methods. Based on this technology, AutoCAD is controlled by the VB of the client program as a server program. It exposes more than 300 attributes of 63 objects to VB. We can introduce these features directly into the VB program code. This cross-application programming feature allows us to take advantage of the existing functionality of the original application and incorporate it into our own programs to create our own applications quickly and easily.