1 Introduction
On the basis of analyzing the structure of the typical plastic profile extrusion equipment, it is trying to change the status quo of a product set of a product in the traditional production process, and proposes the structure of an open profile universal head. And with the help of modern design concepts, we have developed the corresponding parameterized die CAD system with design flexibility, the open profile extrusion die CAD system, which uses the parameter-driven approach to update the design content to meet the needs of the replacement of cattle products. Undoubtedly, the research content in the article will play an active role in the development of plastic profile extrusion molding technology.
2 Open profile extrusion die universal head structure
Due to the wide variety of profiles produced by the company, in order to adapt to products with different cross-sectional shapes and reduce the investment in manufacturing equipment, the company will use only the forming port template 1 in the machine head according to the actual situation, as shown in Figure 1. And with the corresponding stereotypes of the way to complete the production task.
3 CAD system design
3.1 Feasibility Analysis
SolidWorks is a set of open system CAD/CAM/PDM desktop integration system based on Windows operating system. It provides API (Application Programming Interface) application programming interface, and provides a large number of OLE objects and their methods and properties, allowing users to effectively develop secondary tools through tools such as VB. Starting from the performance of the universal head of the mold, it is necessary to develop a CAD/CAM system in order to further improve the general degree of use. Take the recorded macro file to modify and edit, and then the secondary development program generated. The exe file is invoked in SolidWorks 2006 as a macro to implement the functions required by the system. So the system design and development are feasible.
3.2 overall system design
When the section of the produced profile product changes, the extrusion die will have two conditions. One is that only the size of the die plate can be changed to meet the production requirements; the other is that the other parts of the extrusion die also need to be changed in size. The CAD system first obtains the relevant information of the product and judges which of the conditions belongs. If it is the case 1, then read the cross-sectional 2D map of the human product, generate a new template entity, and then carry out other related aspects of the CAM (this article will not be described in detail); if it is the second case, change each by parameter-driven method. The parameters of the component (the system correlates related design parameters of each component, reducing the chance of error). Due to the change in the size of multiple parts, in order to ensure the eligibility of the entire product, the next step will be analog assembly (here to call the standard parts stored in the system database). When it is confirmed that each component is properly designed, it enters the next stage of mold processing CAM. According to the relevant concepts of software engineering, the flow chart of the CAD system is shown in Figure 2.
The system will use SolidWorks APl's capabilities to compile SolidWork plug-ins, integrate them into the SolidWorks environment, and use SolidWorks programs for management. The SolidWorks plug-in is a DLL file. In the process of generating a DLL with a program, you must define the interface between the DLL file and SolidWorks. The system uses the SWAddin.ConnecteiToSW function of the SolidWorks plug-in file and the SwAddin.DisconnectFmmSW function of the SolidWorks interface to implement the function and develop the running interface. As shown in Figure 3.
3.3.1 System Menu
For the realization of the above functions, the system main menu is designed. Submenu items, as shown in Table 1.
The parameter design window of the mouth template in the head menu (as shown in Fig. 4) is taken as an example to illustrate the realization of the function of the parameters in the system. Enter the parameters that need to be changed in the corresponding position in this interface, and then click the Design button. The system will regenerate new mouth template parts.
The cross-sectional shape of the extrusion die is generally provided by the demander as long as it is saved in the system as *. Dxf or *. The dwg format file can be called by the system, and then replace the original cross-section sketch to create a new mouth template. Part of the program code:
SolidWorks can play a significant role in auxiliary structure design, auxiliary engineering analysis, and auxiliary manufacturing of molds. In particular, SolidWorks provides users with rich API functions, allowing users to develop more adaptable software to meet their own special needs. Demand. The general-purpose head structure for open profile extrusion dies proposed in the article, and based on the Parametric CAD system developed by SolidWorks for the user's API functions, makes the superiority of the universal heads further expanded. The same type of mold CAD system design and development provide a reference. The application of the system has achieved remarkable results in saving mold manufacturing costs and shortening the cycle of mold making, and has been used in many companies to obtain good economic benefits.
On the basis of analyzing the structure of the typical plastic profile extrusion equipment, it is trying to change the status quo of a product set of a product in the traditional production process, and proposes the structure of an open profile universal head. And with the help of modern design concepts, we have developed the corresponding parameterized die CAD system with design flexibility, the open profile extrusion die CAD system, which uses the parameter-driven approach to update the design content to meet the needs of the replacement of cattle products. Undoubtedly, the research content in the article will play an active role in the development of plastic profile extrusion molding technology.
2 Open profile extrusion die universal head structure
Due to the wide variety of profiles produced by the company, in order to adapt to products with different cross-sectional shapes and reduce the investment in manufacturing equipment, the company will use only the forming port template 1 in the machine head according to the actual situation, as shown in Figure 1. And with the corresponding stereotypes of the way to complete the production task.
Fig.1 General machine head structure and several common profile cross section structures
3 CAD system design
3.1 Feasibility Analysis
SolidWorks is a set of open system CAD/CAM/PDM desktop integration system based on Windows operating system. It provides API (Application Programming Interface) application programming interface, and provides a large number of OLE objects and their methods and properties, allowing users to effectively develop secondary tools through tools such as VB. Starting from the performance of the universal head of the mold, it is necessary to develop a CAD/CAM system in order to further improve the general degree of use. Take the recorded macro file to modify and edit, and then the secondary development program generated. The exe file is invoked in SolidWorks 2006 as a macro to implement the functions required by the system. So the system design and development are feasible.
3.2 overall system design
When the section of the produced profile product changes, the extrusion die will have two conditions. One is that only the size of the die plate can be changed to meet the production requirements; the other is that the other parts of the extrusion die also need to be changed in size. The CAD system first obtains the relevant information of the product and judges which of the conditions belongs. If it is the case 1, then read the cross-sectional 2D map of the human product, generate a new template entity, and then carry out other related aspects of the CAM (this article will not be described in detail); if it is the second case, change each by parameter-driven method. The parameters of the component (the system correlates related design parameters of each component, reducing the chance of error). Due to the change in the size of multiple parts, in order to ensure the eligibility of the entire product, the next step will be analog assembly (here to call the standard parts stored in the system database). When it is confirmed that each component is properly designed, it enters the next stage of mold processing CAM. According to the relevant concepts of software engineering, the flow chart of the CAD system is shown in Figure 2.
The system will use SolidWorks APl's capabilities to compile SolidWork plug-ins, integrate them into the SolidWorks environment, and use SolidWorks programs for management. The SolidWorks plug-in is a DLL file. In the process of generating a DLL with a program, you must define the interface between the DLL file and SolidWorks. The system uses the SWAddin.ConnecteiToSW function of the SolidWorks plug-in file and the SwAddin.DisconnectFmmSW function of the SolidWorks interface to implement the function and develop the running interface. As shown in Figure 3.
3.3.1 System Menu
For the realization of the above functions, the system main menu is designed. Submenu items, as shown in Table 1.
The parameter design window of the mouth template in the head menu (as shown in Fig. 4) is taken as an example to illustrate the realization of the function of the parameters in the system. Enter the parameters that need to be changed in the corresponding position in this interface, and then click the Design button. The system will regenerate new mouth template parts.
The cross-sectional shape of the extrusion die is generally provided by the demander as long as it is saved in the system as *. Dxf or *. The dwg format file can be called by the system, and then replace the original cross-section sketch to create a new mouth template. Part of the program code:
SolidWorks can play a significant role in auxiliary structure design, auxiliary engineering analysis, and auxiliary manufacturing of molds. In particular, SolidWorks provides users with rich API functions, allowing users to develop more adaptable software to meet their own special needs. Demand. The general-purpose head structure for open profile extrusion dies proposed in the article, and based on the Parametric CAD system developed by SolidWorks for the user's API functions, makes the superiority of the universal heads further expanded. The same type of mold CAD system design and development provide a reference. The application of the system has achieved remarkable results in saving mold manufacturing costs and shortening the cycle of mold making, and has been used in many companies to obtain good economic benefits.
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