Sheet metal forming is used to make a wide variety of parts, such as automobiles, airplanes, electrical appliances, household goods, arts and crafts, medical appliances and other parts. The traditional plastic processing production method is to design and manufacture the mold first, and then use the mold to process the product. It is a production method suitable for single-type, large-volume, and long product renewal cycles. However, today's society has diversified product requirements, product upgrading, product life cycle is getting shorter and shorter, product design is constantly innovating, and product production requires multiple varieties and less batches. Therefore, the traditional plastic processing method has shown its own serious shortcomings in modern production. For example, it is not conducive to the innovative design of products, is not suitable for the frequent replacement of products, and can not meet the needs of shortening delivery time. In order to meet the needs of the market, some flexible plastic processing methods have emerged in recent years, that is, there is no need to design and manufacture molds, but parts are directly produced by incremental forming. This new processing technology is different from the traditional plastic processing technology of “designing, manufacturing, and then stamping”. It is an advanced intelligent manufacturing technology that combines numerical control technology, CAD technology and metal plastic forming technology.

Based on some research on successive plastic forming, we have developed a plate numerical control sequential plastic forming system, which is a system for realizing the above flexible plastic processing. The system is organically combined by a computer, a numerically controlled machine tool, a simple shape tool, and a simple workpiece holding device. When the system is used for plastic forming of the sheet, the three-dimensional modeling of the product is firstly carried out on the computer according to the requirements, and the control program of the numerical control machine tool is further prepared according to the forming requirements of the product, and the feeding system of the numerical control machine tool is used to make the board. The material is incrementally shaped in accordance with a given trajectory to finally achieve the desired shape. This method does not require traditional mold design and manufacturing, so it can quickly respond to the needs of the market, and is conducive to the innovative design of the product, especially suitable for the production of small batches, multiple varieties, and complex shapes.

2 System Configuration and Working Principle Since the sequential plastic forming is a method in which the material is locally deformed by a simple shape tool to form a desired part, that is, a forming method of forming the part by the wrapping surface formed by the movement of the tool. Therefore, the plate numerical control successive plastic forming system of this research is mainly composed of a numerical control machine tool, a simple shape tool, a simple workpiece holding device and an ordinary computer. In order to utilize the existing resources, in this experiment, the CNC machine tool temporarily selected the machining center. In operation, the metal plate is mounted on the workpiece holding device; at the same time, the original tool is replaced by a plastic forming tool with a simple shape; the axes of the machining center are controlled according to the data obtained from the three-dimensional modeling and layering of the product. The movement causes the metal sheet to move according to a certain trajectory, and the tool is fed according to a certain regularity in addition to its own motion, so that the sheet is gradually plastically deformed to form a part of a desired shape and size.

In terms of software, the main use of 3D CAD / CAM software MasterCAM or Pro / Engineer. By selecting the appropriate processing method, define the processing parameters, form the tool path, after the post-processing to generate the NC code, into the machining center, the aluminum sheet metal CNC successive plastic forming experiments.

Guangdong Provincial Natural Science Foundation funded project number: 90546) Received period: The CAD/CAM integrated system based on PC platform developed by 2001-08-28 is very common and highly successful in the machining industry. software. It is a very comprehensive software integrated with CAD and CAM. It can draw 2D and 3D part graphics in the CAD part of Mastercam, and can directly program tool path in the CAM part of Mastercam. 5CI Mastercam8.0 The CAD module, which provides a wide range of capabilities for drawing geometry, including points, lines, arcs, polylines, surfaces, ellipses, text, and basic entities. It can draw stereoscopic graphics in isometric view in any plane and viewing angle. It can be used for labeling, annotation and dimensioning, as well as dynamic rotation, translation, scaling and magnification. The modularization of the surface in the system has been able to accurately and accurately draw the shape of a particularly complex workpiece. Surface models of various shapes of sheet metal parts can be constructed by means of Kunming and lifting.

For complex surface shapes, you can also use Pro/Engi-neer or other software to shape, then use IES file to output surface and wireframe models, and transfer to Mastercam to generate machining programs.

3 Tool Trajectory Formation The Mastercam system focuses on CNC machining programming. Its curve and surface design functions are for CNC machining programming. It has 2~5 coordinate CNC milling programming capability, wire cutting machining programming capability and turning machining programming capability.

In the experiment of this study, the tool path for plastic forming of the sheet was generated according to the programming method of the cutting process, and the part was formed by replacing the profile of the mold with the wrapping surface formed by the tool trajectory.

Although the plastic forming takes the tool path in a cutting manner, only the trajectory of the tool is used in the forming. In the numerical control plastic forming experiment of the plate, the original plastic cutting tool was used instead of the original tool of the CNC machine tool, and the newly developed special clamping device was installed on the CNC machine tool, the plate was clamped in the middle, and the bottom plate was kept at the bottom. Plastic deformation space. In this way, it is ensured that during the forming process, along the trajectory of the tool, the sheet metal is plastically deformed rather than cut.

The plane of the sheet is roughed by the groove method in the MasterCAM surface machining function, and then the line can be finished by various methods such as assembly lines and contour lines. Of course, the roughing here is not the same as the real trenching, but the trajectory of the trenching method is used. It is the roughing path that is taken out by the trenching method in MasterCAM. The trajectory is from top to bottom, and the same layer is from the inside out. It is some molybdenum parts that are formed.

4 Conclusion The NC plastic forming of sheet metal combines CAD technology, numerical control technology and metal plastic forming technology to form a new plastic processing method by directly forming the metal sheet into the desired product without using a mold. It can quickly respond to the needs of the market and users, truly adapt to the needs of modern manufacturing, meet the needs of continuous upgrading of products, and meet the requirements of innovative design, multi-variety and low-volume products. In this paper, the computer, CNC machine tool and plastic forming technology are used to form a CNC successive plastic forming system with computer, machining center and simple shape tool and simple structure. The preliminary research on the NC plastic forming of the plate has been carried out successfully. Some different shapes of parts have been machined and their forming limits have been improved.

(Finish)

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