Application of the hottest Solidworks in sheet met

2022-08-22
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The application of Solidworks in the design of sheet metal parts

Introduction

as a common structural part, sheet metal parts are widely used in communication, electronics, automobile, agricultural machinery, textile machinery industry, food machinery, electrical appliances, instrumentation and other industries. Its common processing forms include bending, forming, stamping, etc., with good interchangeability of shape and dimensional accuracy, which can meet the general assembly and use requirements. After plastic deformation, the internal structure of metal is improved, and the mechanical strength is improved. It has the characteristics of light weight, good stiffness, high precision and smooth and beautiful appearance. Combined with welding, riveting, splicing and other processes, it can make the structure of parts more reasonable and processing more convenient. It is the main method to manufacture structural parts with complex shapes

at present, 3D design has been widely used in various fields. Many software also provides sheet metal design modules, such as SolidWorks, solid edge, pro/e, etc. using this module, we can easily complete sheet metal design, obtain the required blanking unfolding drawing, improve the design quality and efficiency, and have the advantages of intuitive design, reducing design errors, easy to modify, etc. In addition, CosmosWorks structural analysis software is embedded in SolidWorks software, which can test and analyze the designed parts at all stages of product design, so as to design better products

taking the sheet metal part of transformer shell as an example, this paper introduces the application process and method of SolidWorks software in sheet metal design in detail

1 3D modeling of sheet metal parts

in sol, it is more important to save raw materials. There are two methods to generate sheet metal parts in idworks software. The first is to create a solid part and then convert it into sheet metal, which can be called sheet metal part design based on solid modeling; The second is to use the specific features of sheet metal to directly generate sheet metal parts, including base flange, edge flange, miter flange, hem, turning, drawn bending, closing angle, broken corner, corner cutting, unfolding, folding, lofting bending, bending, cutting, forming tools, etc, This method can be called sheet metal part design based on sheet metal design module. The second method generates sheet metal parts from the initial design stage, eliminating redundant steps, making the model generation of sheet metal parts easier and faster

for this purpose, we use the second method to complete the three-dimensional modeling of the transformer shell using sheet metal features such as base flange, edge flange, bending, etc

2 unfolded drawing of sheet metal parts

before the introduction of CAD technology, the blanking size of sheet metal parts was mainly calculated by the bisection projection method, and the manual method was used according to the principle of unchanged neutral layer length. However, for sheet metal parts with complex shape and holes on the flange, it is not only difficult to calculate the unfolded size and hole location size manually, but also difficult to calculate accurately. Using the unfolding command in the SolidWorks sheet metal function makes this work very simple. We only need to click the flat type feature to get the three-dimensional unfolded drawing of the sheet metal part after completing the three-dimensional modeling of the sheet metal part. When we need to unfold and fold one or more bends, we can also use the unfolding and folding tool. It should be noted that the flat type should be the last feature of the sheet metal part: in the feature manager design tree, All features before the flat type appear in folded or unfolded sheet metal parts, while all features after the flat type appear only in unfolded sheet metal parts. After obtaining the intuitive three-dimensional unfolded drawing of sheet metal parts, we can judge whether the blank shape is reasonable according to the knowledge of sheet metal forming process design, and modify the structure that may cause uneven distribution of deformation along the blank, so as to improve the quality of products

when the engineering drawings of sheet metal parts are generated from 12 domestic invention patents, the unfolded drawings of sheet metal parts can not only be generated automatically, but also display bending annotation information such as bending direction, angle and radius, which is convenient for guiding production and processing

3 strength calculation of sheet metal parts using CosmosWorks

the transformer shell needs to bear the weight of iron core and wire package in the process of use and installation. Therefore, it is necessary to use the finite element method to calculate the strength of the transformer shell to judge the common safety condition

3.1 working condition analysis

during the use and installation of the transformer shell, there are mainly two working conditions: working condition 1: during the use, the weight of the iron core and wire package is applied to the inner surface of the transformer shell

working condition 2: during the installation process, the weight of the iron core and wire package is concentrated on the four claws of the transformer shell:

3.2 generate "research 1", assign materials

open the sheet metal parts of the transformer shell, enter the CosmosWorks management design tree, and generate "research". The lattice type is solid, the analysis type is static analysis, and the ductile iron material is selected

3.3 application constraints

in the process of use and installation, the two holes of the transformer are fixed. According to this actual situation, we impose an immovable (no translation) constraint on the two hole surface L

3.4 apply load

for condition 1, we apply a pressure of 0.5kg/cm2 vertically on the bottom surface of the transformer shell

3.5 grid division And run the research

select a high-quality standard grid, set the Jacobin inspection to 4, select the grid control mode with smooth surface, set the overall size of the grid to 1mm, start the grid division and run the research

3.6 result analysis

after the analysis and calculation, the system automatically obtains the default diagrams such as stress, strain and displacement. We add Mises stress diagrams as needed to display the maximum and minimum annotations. According to the calculated stress, strain and displacement and the minimum safety factor of 3.7, it is judged that the structure meets the safety requirements during use

3.7 the calculation of condition 2

is the same as the setting method of "Study 1". Only when the load applied in "Study 2" is changed to apply a pressure of 0.5kg/cm2 vertically on the four claw surfaces at the lower part of the transformer shell, other setting and solving methods are the same as that of condition 1. After calculation, it can be found that the four claws are deformed during installation, and the structure needs to be redesigned. Therefore, stiffeners need to be added at the four claws. After updating the model, Re run "Study 1" and "Study 2" to get new calculation results. Analyze the results. The flat sample can hold 0 ⑴ 5mm. The new structure meets the use requirements

4 conclusion

solidworks software can complete sheet metal with modeling features and specific sheet metal features 8 During the operation of this machine, it is necessary to avoid opening the box door as much as possible, because it is easy to cause the ice sealing phenomenon of the internal evaporator and other parts when opening the box door at low temperature, especially the lower the temperature is, the more serious the state is. If it must be opened, the design of time pieces should be shortened as far as possible, and it is very convenient to get the unfolded drawing of sheet metal parts and the size, area and quality of blanking; The seamlessly integrated CosmosWorks software can calculate the strength of the designed products, and optimize and improve the designed products through the calculation results, so it is very convenient to complete the design of sheet metal parts. (end)

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