Using appropriate punching processes, the shape, size and properties of sheet metal are processed into finished parts according to specific requirements: sheet metal parts.
0. Introduction
Sheet metal processing is a common process in today's machining and is becoming increasingly important in the field of mechanical engineering in China. Sheet metal is a metal sheet with a thickness of less than 6 mm, which is produced through a specific stamping process according to specific shape, size and performance requirements of sheet metal processing. Sheet metal is processed through shearing, punching, welding, splicing and other suitable steps. The role of processing technology in the sheet metal manufacturing process is critical and plays a crucial role in determining whether the final sheet metal is qualified or not.
1. What software is available for sheet metal processing?
CAD/CAM systems for sheet metal parts are an important part of sheet metal manufacturing. The most used software is 3D CAD/CAM software imported from abroad. This software is widely used in the sheet metal manufacturing industry. The software has a sheet metal design module. For example, there is a sheet metal design software module that can be used to create three-dimensional solid designs from sheet metal. The sheets can be viewed on the computer for unfolding and approval of the mold design. Using methods to automatically generate three-dimensional modeling and two-dimensional expansion can play an important role in sheet metal design and processing. In the new construction process, three-dimensional construction is very important.
2. Research on sheet metal processing techniques
There are many sheet metal processing processes, such as: B. Sheet metal bending, sheet metal stretching and sheet metal welding. The sheet metal bending process is a very important part of sheet metal processing. During the sheet metal bending process, certain standards for sheet metal bending must be adhered to depending on the material and size. However, during the sheet metal bending process, the bending height must be precisely controlled. It must not be less than twice the thickness of the sheet. If it is more than double, it will increase processing difficulties and affect the quality of the workpiece. When bending sheet metal parts based on the opening, this must be done strictly in accordance with the standards. When stretching sheet metal, the focus should be on controlling the radius of the corners of stretched parts, the adjacent radius of the corners of rectangular stretched parts, and controlling the radius of the inner cavity of circular stretched parts and other aspects. The radius control of the floor and straight wall expansion parts, as well as the radius control of the flange expansion parts and the edge of the expansion parts, therefore the radius control of the expansion parts of the two main components. To ensure the quality of the finish, we must strictly control the radius of the rounded corners of the bottom and the straight wall of the stretched parts. In order to strictly control the radius value of rectangular stretching parts, the overall stretching quality can be qualified according to the standard strict control of the inner cavity diameter. The sheet metal welding process is also an important part of sheet metal processing, namely in the sheet metal processing process. Welding technology is everywhere. Welding can meet the joining requirements of parts and increase the strength of sheet metal. There are many technological capabilities, so the welding process needs to be adjusted according to real needs. When welding sheets made of different materials, the welding process must also be chosen differently. When welding sheet metal, special attention must be paid to the welding quality so that the surface quality of the sheet metal is protected and the internal quality meets the requirements.
3. What are the methods for unfolding the sheet metal surface?
Sheet metal surface unfolding methods mainly include drawing method, calculation method, coefficient method, program method, computer-aided design method, computer-aided design method and computer-aided design method. finite elements.
The drawing method is based on the real need to expand the shape of a part of the surface. A comprehensive analysis is carried out and everything is divided into several small basic parts. Then, according to the surface, the basic parts can be divided into the actual shape of the surface to expand the parts. Then, the length of line segments is implemented according to the projection method to transform the surface view according to the basic parts. A surface with the actual shape of the surface is then drawn on the layer. The actual shape of the surface is then drawn onto the layer. The actual shape of the surface is drawn on a plane. This is the drawing method.
Based on the shape characteristics of the part to be analyzed, a set of actual surface shapes of all formula edge lengths is derived through appropriate calculations. This is the calculation method. First, the lengths of all edges of the actual shape of the part are determined according to known conditions, and then an extension drawing is created based on the actual shape of the surface. However, because the part calculation formula is very complicated, a problem in a part will cause errors, the work will be very laborious, and the error rate will be high. The coefficient method based on the calculation method is relatively simple and is well received by workers.
The programming method is to use a computer language to create a good program in advance, and then use the relevant known data to calculate the actual length of each line segment, and then draw the actual shape of a surface to draw the extension diagram. This method is simple, fast and accurate, but requires certain computer skills and places relatively high demands on employees.
The computer-aided design method combines the computer-aided drafting method and the programming method. Based on the pre-built computer program, Solidworks tools are used to draw the parts of the three-dimensional map. However, before calculating the actual surface shape of the parts, the actual shape of all edge line lengths must be known. Run the software to find the actual length of the line segments, and then use the drawing commands to unfold the map drawn on a computer. This is a highly efficient, accurate and more subjective calculation method.
The finite element method mainly deals with the spatial stretching of curved parts. The degree of deformation of the sheet during processing is analyzed by software and then the shape of the unfolded surface is calculated. This is an operationally difficult but highly accurate method.
