Shulou(Shulou.com)06/02 Report--

Abstract: with the continuous improvement of technical level, computer-aided drawing software has gradually replaced manual drawing, and the popular stainless steel sheet metal has been widely used in all fields of life. Pro / E is a set of automation software from design to production, which includes the design of stainless steel sheet metal, so how to design the structure of stainless steel sheet metal in Pro / E design environment is a technology that designers must master. This paper mainly discusses the Pro / E design environment and the material characteristics of stainless steel sheet metal, and discusses how to design the structure of stainless steel sheet metal in Pro / E environment according to the actual situation, hoping to be helpful to relevant designers and scholars.

In modern product design, computer-aided design is gradually popularized because of the characteristics of intuitive, simple and optimized design. In the past, computer-aided design is mainly modeled in two-dimensional views, which can only play the role of auxiliary drawing, but with the complexity and diversified requirements of products, the design software begins to develop in the direction of three-dimensional design interface. For example, compound modeling software UG and I-DEAS are suitable for building complex structures, while Pro / E is suitable for the design of relatively simple structural parts and complex structural components.

Compared with the equivalent CAD software, Pro / E can realize the directionality and arbitrariness of three-bit modeling, simulate the assembly of structures and components online, and carry out feasibility analysis to shorten the product design cycle and reduce the production cost at the same time. It is because of these superior characteristics of Pro / E software that it has become the leader in 3D modeling software in the world.

1 Pro / E design environment and function introduction

Pro / E 3D modeling software provides the most closely integrated and comprehensive product development environment, including many functions in industrial design and mechanical design, as well as powerful functions such as functional simulation, manufacturing, data management and so on. it is widely used in electronics, machinery, household appliances, aerospace and other fields.

Pro / E is a new generation of product structure modeling system, which is famous for its parameterization and is the earliest application of parametric technology design. Pro / E software has powerful design function, which is widely used in the current three-dimensional structural design, including the design and processing of mechanical entities. It is the mainstream software in the field of mechanical CAD / CAM / CAE in today's society, and occupies an important position at home and abroad.

Pro / E adopts module mode, including sketch drawing, part making, assembly design, sheet metal design, processing and other application functions, ensuring that users can selectively design and use according to their own needs. At the same time, the standard parts library of Pro / E system contains basic profiles and common parts such as bolts, nuts, screws, studs, washers, seals and springs, which can be called directly to facilitate designers to design.

The environment for constructing stainless steel sheet metal design in Pro / E can be divided into three types:

① directly create a new sheet metal file type: create 10 new sheet metal parts

② builds sheet metal parts into new parts in the assembly module: components create a part and a sheet metal part

③ converts existing solid parts to sheet metal: select sheet metal to sheet metal conversion in the application.

The content of sheet metal design in Pro / E environment includes creating separate sheet metal wall, creating additional sheet metal wall, sheet metal bending operation, sheet metal forming operation, other operations of sheet metal, sheet metal setting and so on. Because sheet metal parts are formed through sheet metal stamping, drawing and bending, the sheet metal modeling in Pro / E is very different from solid modeling. Pro / E design environment creates a design environment for sheet metal modeling, which is different from solid modeling, which makes it closer to the actual processing mode.

The bending coefficient of sheet metal design in Pro / E is not fixed, which is mainly set according to the groove knives of bending machines used by different companies, which will directly affect the actual size of sheet metal design bends.

2 characteristics of stainless steel

Stainless steel is a new material, because of its beautiful surface, high possibility of use, high strength, corrosion resistance, high temperature resistance, maintenance-free and strong vitality, stainless steel is widely used in public facilities and open-air working environment, such as common clothes racks, doors and windows, automatic ticket vending machines, ticket inspection machines and so on. Because there are wire drawing lines on the surface of stainless steel, it is easy to scratch the surface and not to repair it in the process of production, so the relative position of adjacent weldments of sheet metal, groove angle, actual production situation and other factors should be fully considered in the process of design and production. scientific and reasonable design and production of stainless steel sheet metal.

Stainless steel is not suitable for welding in the actual processing and production engineering, which is easy to cause burns on the outer surface of stainless steel, so bending is used instead of welding as far as possible in the design of sheet metal structure, and it is also convenient for post-processing. In the machining process of stainless steel, the surface of stainless steel is easy to tear, so it is difficult to weld stainless steel. For stainless steel that must be welded, it is necessary to use DC welding machine and special stainless steel electrode.

Structural design of stainless steel sheet metal under 3 Pro / E environment

In the structural design of stainless steel sheet metal under pro / E environment, the theme characteristics of stainless steel sheet metal are mainly constructed by wall features, and then the sheet metal design is realized by punching, bending, local punching, unfolding and other operations. In the Pro / E environment, the sheet metal has green and white surfaces, and the side surface (depth) is formed only after the regeneration is successful. The green side is called the driving side, and the white side represents the thickness.

The functions required for sheet metal design under P ro / E environment are complete. Here is a brief introduction to the main functions:

3. 1 to establish a basic thin wall

Open the menu manager under the Pro / E environment, select the sheet metal parts in the feature class, and enter the sheet metal design interface. Open the menu manager, "options" include leveling, stretching, rotation, blending, offset, advanced functions, mainly used to generate the first thin wall, that is, the foundation wall.

When creating the thin wall of sheet metal, the inner diameter dimension can be used to change the thin wall thickness at the arc bending of the thin wall shape line. the main operation step is to select the "thickening" kinetic energy under the feature tool in the toolbar "sketch".

3. 2 sheet metal notch

In the actual production and processing process, due to the extrusion of the material, the sheet metal is very easy to form the protruding deformation of the material in the bending process, so in the three-position modeling design, a small area of notch is usually dug in the sheet metal bending to avoid extrusion deformation of the material. When creating a sheet metal notch feature, a local coordinate system should be established at the profile, and the grooves dug out by the notch should be perpendicular to the sheet metal so that extrusion will not occur at the bend.

3. 3 sheet metal punching

Punching has the characteristics of cut, so it is necessary to select the position of the punch on the sheet metal and punch out the convex sheet metal according to the requirements of the assembly mode, and the machining tools needed for punching have been defined when defining the notch feature. The steps of punching feature definition are as follows: open the tools of the toolbar, open UDF features (UDF features can be divided into single and subordinate features), enter parameter values, and select reference geometric data to complete the feature definition.

3. 4 sheet metal bend

The bend feature is used to bend the plane area of the sheet metal to a certain angle or to bend into an arc. This kind of feature can only be used in the plane area of the sheet metal, but not based on the feature of another bend. The main bending includes two forms: corner and curl, including rule, with transfer, and plane. In general, crack arrest grooves of seam, extension, rectangle and non-circular styles need to be added to the bending of sheet metal to prevent cracks caused by bending.

3. 5 sheet metal unfolding

Pro / E has the function of unfolding sheet metal thin wall, which can be divided into three ways:

① general shape expansion: that is, for the expansion of the sheet metal plane area, a plane or an edge can be selected as the unfolding fixed edge.

② expansion with turning area: that is, for the expansion of sheet metal with turning area, you can first select all the fixed faces of the sheet metal expansion, and then select all the turning surfaces

③ profile-driven unfolding: this method is often used to unfold thin-walled and thin-walled lips or flanges with irregular shapes. The specific step is to first select the sheet metal fixed surface, and then specify a section line to determine the shape of the deformed surface for profile expansion.

Pro / E can easily unfold sheet metal with thin walls of plane, arc, cone and other geometric shapes, but for other thin walls with irregular shapes, it is easy to cause material deformation or unable to unfold. In this case, it is necessary to use the functions of deformation area, surface cutting, edge cutting and so on under Pro / E. It is that the sheet metal that needs to be unfolded has the characteristics of "outer boundary line of sheet metal" or "adjacent deformed surface with outer boundary line of sheet metal", so as to facilitate the expansion of sheet metal thin wall.

The structural design functions of stainless steel sheet metal in Pro / E environment are far more than these, and other design features include sheet metal cutting, flat array, modeling printing and so on, which fully cover all the functions needed for sheet metal design.

The design of stainless steel sheet metal should not only meet the functional requirements, but also meet the appearance requirements, but the two are contradictory in actual production, and it is difficult to weigh. If we want to fully meet the functional requirements, we have to ignore the appearance design requirements; if we fully meet the appearance requirements, it may not be possible to achieve in the structural design, processing and production, or the loss may outweigh the gain because the cost is higher than the actual use value. Therefore, in the structural design of stainless steel sheet metal under the Pro / E environment, we must scientifically weigh the functional requirements and appearance requirements, and determine the design emphasis direction according to the actual use environment and applicable crowd.

When sheet metal parts are welded, if the design area of sheet metal is too large, it is easy to cause uneven surface due to high temperature or pressure, which can not meet the needs of users in practical applications. Therefore, when designing the three-dimensional structural skeleton model, the designer must consider the characteristic of sheet metal parts, and divide the sheet metal into two parts by dividing the sidewall, bending the butt joint and fastening it with screws to prevent the damage to the outer surface of the sidewall during welding. effectively reduce the waste and economic loss of materials in production engineering caused by too large sheet metal area.

4 Summary

Through practical operation and experience, Pro / E is a technologically advanced and powerful design software, which can create various parts and components, and can simulate welding and remove interference according to the actual production and processing of sheet metal, which can effectively avoid some unnecessary mistakes. At the same time, the scientific and reasonable use of Pro / E to design the structure of stainless steel sheet metal can protect the drawing surface of stainless steel from damage and reduce the manual welding workload and welding damage to stainless steel.

Many practical and powerful functions such as parameterization, sheet metal bending and deployment of Pro / E 3D modeling software play an active role in improving product design level and design efficiency, which is an inevitable trend in the field of engineering design in the world. Therefore, using Pro / E software to develop stainless steel sheet metal products can bring about a substantial leap in its design level. This article is from Yuyun sheet Metal Software. For more details, please click: www.bjmes.cn

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