CAD software based on assembly association
Regardless of the CAD software, the most basic function is to build a 2D or 3D geometric model, which is the passing line of CAD software. A CAD system should mainly include three aspects: first, the creation, modification, and preservation of geometric components, geometric model database; second, professional design support functions; third, non-geometric model data database, and these data Management function.
Design is the meaning of creating, planning, and conceiving. Design is a rather complicated process that can only be accomplished by a professionally trained and talented person. At the time of design, each relevant element (such as the part under assembly, the structure on the part, the shape and size in the structure, etc.) needs to be adjusted and matched repeatedly. This is the action that always exists in the design process.
Take the design of computer-specific tables and chairs as an example. There are two original conditions for design: one is based on statistics and the other is existing computers. According to the statistical size of the human body structure, it can be determined that the seat height of the chair should be 410 mm and the height of the table surface is 700 mm, which is the most comfortable size. According to the size of the specific computer, it can be determined that the position of the keyboard should be no less than 750mm × 250mm, and the 17-inch display is 450mm away from the outer edge of the keyboard, so the area of ​​the table is at least 750mm × 800mm.
Then enter the detailed design, determine the structure, appearance, assembly relationship, process, material, color design, but also consider the issues of maintainability, technical and economic analysis results, processability, stress status. Finally, assembly drawings and part drawings can be produced and put into trial production. From generating the demand to determining the general structure, then designing the specific components, and finally completing the final structure, this is the basic process of design.
Finally, consider the possibility that this design will change if the tube display is replaced with a liquid crystal display. This requires that in the process, the design of all components must be related to the relevant components, and the parameters are determined under the control of the assembly relationship. Therefore, whether it can support the top-down creation design concept and complete the related parts design based on the assembly relationship is the main indicator for evaluating the CAD software capability.
The essence of the design process is to perform a series of actions such as simulation processing and simulation assembly on objects that have not been finalized until the final geometric model is completed by satisfying each design constraint. Conversely, the determination of the design must be closely related to the future processing, measurement, assembly and structure of the designed object.
How to reproduce such a thinking process as completely as possible in the CAD software? Various specialized simulation software came into being, and people can carry out the process on the computer in the past production site. This is the eternal pursuit of CAD series software, which is the main meaning of "virtual design" in academic circles.
Therefore, the realization of such "reproduction" as much as possible on the basis of the existing software functions, or the correspondence of rules, has become the development focus of current CAD software. What can be solved at the moment is also the most relevant solution, which is "assembly-based correlation design". Let's take Inventor software as an example. Its most distinctive features are mainly in four aspects.
Design parameter association under parameterized algorithm
In part design, design parameters can be generated in the shape or customized by the user. A parameter of a main part can be linked to many other parts by derivation and used directly in the model. This way, when the main part parameters change, the associated part will follow the update. This represents the main idea in the design: a certain size of the part, like a part, or related.
Assembly association under variable algorithm
In the assembly design, the shape of the new part is set to a "slow constraint" state, and the remaining constraints are added by the assembly function, and finally the association with the old part is caused. After the old part has been modified, the new part will follow the update in accordance with the assembly relationship. This represents another major idea in design: the structural shape of a part in an assembly is related to the related part.
The role of sketches in design
In Inventor, sketches are not only the basis of the features, but also the assembly design, which can be used as an assembly benchmark for components and even for motion simulation of the mechanism. This completes the conceptual design and post-application in the geometric range. This completes the “bone†in the design and can grow “meat†on this basis to complete the conceptual constraints of the final design.
Design project management
This function has surpassed the concept of “image file managementâ€. It is the management from the design project. It will automatically and completely control the related models, assemblies, engineering drawings and other auxiliary information, and manage them in terms of version and interconnection. Things like this can't happen without finding a drawing in a complex assembly design.
These main features are more complete and accurate representations of existing design rules. At the same time, designers are freed from the cumbersome operations and focus more on the improvement and modification of the design.
From the perspective of future development, the new CAD software represented by Inventor will definitely bring more design tools to the mechanical designers, improve the design quality, and obviously improve the design efficiency.
Toilet Brush,Handy Toilet Brush,Stainless Toilet Brush,Toilet Bowl Scrubber
Heshan Jasupi Sanitary Ware , https://www.jasupifaucets.com