CAD / CAM technology innovation in CNC machining

Computer aided design technology (CAD technology) and computer aided manufacturing technology (CAM technology) are the core technologies in numerical control specialty, which have been widely used in the field of numerical control processing. Reasonable use of these two technologies, can greatly reduce the cost of machine tool processing, and significantly improve the accuracy of machine tools.

With the rapid development of the contemporary manufacturing industry, the CNC machine tool industry continues to progress, but the operation of CNC machine tools is difficult, and the corresponding programming intensity is also large, so the practical application efficiency of CNC machine tools is difficult to be significantly improved. The combination of CAD / CAM technology can improve the design accuracy and gradually improve the development speed of the manufacturing industry under the premise of reducing the design time.

The CAD / CAM technique

1. CAD technology

Computer-aided design (CAD) technology, namely computer-aided design auxiliary technology, through graphics processing, to facilitate the daily work of the staff. In the engineering design, the use of information technology can reduce the work intensity, and conduct data analysis. Both the model and the data can be processed by a computer-aided design management system to improve work efficiency. At the beginning of the design, we established a computer aided design (CAD) technical aided design system, and the graphics editing, to help the staff design the feasibility and effectiveness of the model. Overall, the CAD technology can design the models that meet the requirements, and realize the transformation and statistics of two-dimensional graphics and solid models.

2. The CAM technology

CAM technology is computer-aided manufacturing technology, the core of which is computer digital control. It can apply CMM technology to the engineering and manufacturing fields, and confirm the system functions through software analysis to improve the overall processing capability of the system. CAM technology can enhance the machining technology, especially CNC machining. It takes the part process route and the corresponding tool content as the input information, and the output information includes the tool movement track of the machining process and related CNC procedures.

If the CAM system is large, a hierarchical structure may include two-or three-level computer systems. The central computer is responsible for overall control, the host computer manages different tasks, and the computers and microcomputers subordinate to the host computer are responsible for issuing instructions and monitoring. In addition, computer workstations and microcomputers are responsible for the control and management of the work. The CAM system includes both hardware and software parts. The hardware mainly includes CNC machine tool, loading and unloading device, testing device, conveying device and computer; the software mainly includes database, computer-aided CNC programming, process design, tooling design, quality control and operation plan preparation and execution.

CNC technology is integrated with CAD / CAM technology

1.CNC technology and CNC machine tools

CNC machine tool is part of automatic machine tool, based on logic principle to write control code to realize machine control. The code is used as the information carrier, and the input quality is ensured, and each signal is controlled by formula operation mode. In the process of processing, CNC machine tools can automatically process parts according to drawings or actual size, optimize the processing quality and efficiency, and promote the development of machine tool control technology.

Digital control technology is a special machining technology, integrating monitoring and detection technology and microelectronics technology, showing the technology integration market. At present, it is widely used in the industrial field. In order to promote the application and development of numerical control technology, it must be based on automation technology. In the research and development of high-performance integrated products, the industrial production capacity needs to be increased to ensure the product quality.

2.CAD / CAM technology integration

In the process of realizing CAD / CAM technology integration, it is necessary to build the corresponding 3D model through precision software. This includes two parts, mold design and finite element model analysis. With the help of two-dimensional drawings, the transmission of 3D model can be realized, so as to avoid inaccurate information, which is not conducive to the match of product effect and design scheme.

In the application of CAD / CAM technology, it is necessary to obtain CNC processing equipment and the corresponding workstation support, machine CAD software for the main measurement work. Currently, most CAD software has the function of output the common file system, which helps to guarantee the consistency of CAD / CAM technology.

Overall, the CAD / CAM technology has the following advantages:

● In the model design work, it can improve the accuracy of software detection and the closure of the model;

● In the 3D model design work, to provide suitable space for accurate development and solve the problem of type error;

● When constructing the established 3D model, it can effectively make up for the defects in the process of information transmission and eliminate the errors of information transmission;

● The number of model round trips can be defined to ensure the delivery cycle and limit standards.

CNC machining programming for CAD / CAM technology

When performing CNC machining, applying CAD / CAM technology is necessary, which requires the use of various computer software to achieve CNC programming work, such as software such as 3D Max and UG. These software have powerful functions, can carry out three-dimensional modeling design, mechanical manufacturing processing simulation processing, and can directly generate numerical control program, so as to carry out numerical control machining operation.

The CNC machining steps include:

1. Part modeling: solid modeling mode is used to model parts as the basis of part design.

2. Part design: use computer software to optimize the design effect of the parts, follow the design principle of first whole and then part design, complete the design of the part wheel, and then fill the details, and apply the curve, straight line, resection, stretching and other functions in the software.

3. Parameter marking: clarify the impact of each parameter on the overall design, and correct the parameters according to the effect of the consequences.

4. Simulation processing: the design model is simulated to reflect the application effect of the process and the waste of raw materials.

5. Generate CNC machining programs: Because you do not need computer software to generate CNC machining programs, you do not need to rewrite the program.

In order to improve the utilization efficiency of programs, a set of three layers of information communication mechanism: application layer, service layer and database layer. The application layer provides control information related to production and processing, and realizes information interaction through remote service; the service layer receives and responds to operation instructions, queries and calls information, based on the public object request agent architecture; the database layer stores data control files, process information and mechanical manufacturing resources, and directly access to the contents of the database by using the Java database.

The CNC machining process of CAD / CAM technology

In the process of CNC machining work, if you want to fully apply CAD / CAM technology, it is necessary to fully understand the overall block diagram. At the same time, in order to improve the CNC machining efficiency, it is necessary to use CAD to build a data model, and fully combine it with CAM technology.

1.CAD binding modeling

Through the application of CAD / CAM technology, real objects can be transformed, and relevant data can be input into the computer to implement the comprehensive analysis of the computer. In the product definition, it is necessary to use the computer to build a perfect digital information and model, and on this basis, to confirm the source of the product information, in order to implement the product design work. At the same time, the corresponding drawings are generated, in order to improve the simulation effect of numerical control machining, so as to reduce the interference of external factors. In the process of production management, it is necessary to obtain the product parameters and application information parameters to promote the development of manufacturing industry, and can give full play to the advantages of CAD / CAM technology. In addition, on the basis of mastering the structure and size of the parts, it is also necessary to choose the appropriate proportion to build the solid geometry model, and use the disk to save the relevant data, so as to provide a reference for CNC machining work.

2. CNC process production

Based on the relevant data of CAD system, after the completion of parts processing, the basic situation of each task should be fully understood, and ensure that the reserve of the selection scheme is completely reasonable, and then automatically solved according to the size of the equipment. When applying the CAM software, the tool track should be grasped in time, and the correct connection command should be issued to effectively realize the beginning and end connection of the tool track, so as to improve the operation effect of the machine tool. When obtaining the knife position data, it is necessary to master the central track of the knife position and the specific posture of the tool, and carry out the calculation work according to the characteristics of the system, so as to ensure the stability of the data acquisition process.

3. CNC program generation and machining method

In order to handle the knife position data reasonably, it is necessary to take the specific control conditions of the CNC machine tool as the basis, and to call the knife position data and the corresponding auxiliary information reasonably. In the process of using CNC machine tools to process parts, it is necessary to improve the machining quality based on the instructions and program characteristics of the system, and transfer the data directly to the CNC system. After the system generates the NC code, it is necessary to carry out 3 D image simulation in time, and with the help of CNC machine tool verification data to reduce the machining error rate. In addition, the running state of the system should also be viewed through the NC program. If there are abnormal conditions in the processing process, the NC program should be adjusted in time to improve the quality and efficiency of CNC machining.

Future development trend

CAD / CAM technology shows the characteristics of integration in the development process. Thus, the system data can be stable transmission, and the operation stability of each program can also be significantly improved. If CAD, technology and CAM technology are fully integrated, it is conducive to breaking the "information island", and thus improving the overall work efficiency

In conclusion

With the rapid development of modern economy, the related industries have put forward higher requirements for numerical control processing. At the same time, the application of CAD / CAM technology is more and more widely, so it is necessary to clarify its development trend to improve the application effect of CAD / CAM technology.