Graduation thesis of junior college majoring in numerical control (working experience 1 year or above)

Macro programming word of typical parts: 17804, page number: 33 PaperNo. : JX070 Project Objective: The graduation project has applied a lot of knowledge learned in three years from the topic selection to the final completion. Through the completion of this graduation project, I am familiar with what we have learned before, and gather scattered knowledge, so as to further familiarize, consolidate and improve the knowledge of all the subjects we have learned before. At the same time, it also exercised our practical ability in NC programming. Also let me systematically and deeply review and summarize the knowledge of many subjects I have learned in the past two years. Let yourself have a great improvement in professionalism.

Significance of the subject: CNC machining technology is of great significance to the development of China's economic construction. At present, the production of enterprises in China is gradually changing from extensive to connotative, and the production of products is also changing from extensive to fine. In order to ensure product quality, reduce costs and improve production efficiency, in the future production, the degree of automation of enterprises will be greatly improved, and the first-line production will develop in the direction of electromechanical integration, program control and digitalization. Form forces us to operate not only ordinary machine tools, but also CNC machine tools in machining. In addition, we are required to have the ability to analyze, judge and deal with emergencies in the production process; Have pioneering and innovative ability, teamwork ability and communication ability. Through the completion of this topic, we can strengthen our mastery of CNC knowledge.

Status at home and abroad: With the development of computer technology, digital control technology has been widely used in various fields of industrial control, especially in the field of machinery manufacturing. Ordinary machinery is gradually being replaced by numerical control machinery with high efficiency, high precision and high automation. At present, the numerical control rate of mechanical equipment abroad has reached more than 85%, while the numerical control rate of mechanical equipment in China is less than 20%. With the application of new technology in China machinery industry, China's position as a world manufacturing center has been formed, and the use, maintenance and maintenance personnel of CNC machine tools are very scarce in industrial cities all over the country. In addition, CNC machining personnel have a wide range of employment. Can be engaged in computer drawing, numerical control programming design, machining center operation, mold design and manufacturing, EDM, wire cutting and other modern manufacturing industries such as molds, watches, hardware industry and small and medium-sized manufacturing industries. Therefore, the existing numerical control technical talents can not meet the demand of manufacturing industry, and the talent market is not large. It is difficult for enterprises to find suitable talents in the talent market, which leads to mold design, CAD/CAM engineer, NC programming and wire cutting. According to the newspaper, senior technicians in China are facing a grim situation of "green and yellow". Old technicians are old, middle-aged technicians are few, and young technicians are not mature yet. In the manufacturing industry, talents who can skillfully operate modern machine tools are scarce. According to statistics, at present, among skilled workers in China, senior technicians account for 3.5%, intermediate workers account for 35% and junior workers account for 60%. Among the skilled workers in developed countries, senior workers account for 35%, intermediate workers account for 50% and junior workers account for 15%. It can be seen that in the next 5- 10 years, the gap of senior technicians in China is still large.

With the adjustment of industrial layout and product structure, the employment structure will also change. The demand of enterprises for higher-level first-line applied talents will increase significantly. With the help of foreign development experience, when entering the period of industrial layout and product structure adjustment, it is urgent to match the industrial structure and cultivate a considerable number of professionals with high cultural level. For CNC machining specialty, not only practitioners are required to have excellent practical ability, but also a solid knowledge of machining theory. Therefore, CNC machining talents with both academic qualifications and strong operational ability have become the most urgently needed talents in society and enterprises.

Research content: This topic mainly studies the macro programming of typical parts. Including the processing technology analysis of parts, and determining the final processing technology scheme; Reasonable selection of CNC machine tools; Determine the processing route of each process. Reasonable selection of cutting tools and determination of cutting parameters in each step; Through the analysis and design of the above items, the corresponding processing program is finally compiled for each working procedure.

Research scheme: the task is completed through the following steps: firstly, the part drawing is analyzed, and the classification of parts and the overall requirements for equipment are preliminarily determined; Secondly, analyze and draw up the process plan, including process analysis and treatment, machine tool selection, tool determination, cutting parameters determination and drawing up the processing plan; Finally, the program suitable for machine tools and parts is compiled.

Expected effect: through this graduation project, improve your ability to collect and consult information; Reasonable application of materials and tools to solve design problems and improve design efficiency; Exercise your ability to analyze and solve problems; Be able to analyze the process of parts and solve the process problems and data processing problems of parts with medium or above complexity; Improve the programming ability and make a reasonable processing program. At the same time, I learned how to solve problems and the ability to solve problems with limited information, which is a comprehensive application of what I have learned in the past three years. On the other hand, I also checked my knowledge and laid a solid foundation for future work. catalogue

Foreword 1

1. Macro program overview 2

1. 1 Feature 2 of the macro program

1.2 the function of macro program II

1.3 macro program definition 2

1.4 application field 2 of macro program

1.5 b macro program 2

1.6 A macro program 5

2. The realization of ellipse in macro program 10

2. 1 programming principle of ellipse in macro program 10

2.2 Example of Elliptic Turning 10

3. The implementation of macro program of elliptical column 15 chamfering.

3. 1 programming principle of macro program for chamfering elliptical column 15

3.2 Determination of the central angle of an ellipse 15

3.3 Example of Chamfering Chip Milling for Elliptical Column 15

4. The implementation of elliptic cylinder in macro program 18.

4. 1 programming principle of elliptical column in macro program 18

4.2 Determination of central angle 18 increase angle

4.3 Example of Elliptical Column Milling Blade 18

5. Realization of Elliptical Column with Chamfering in Macro Program 20

5. 1 Programming principle of elliptical column with chamfer in macro program 20

5.2 Example of elliptical cylindrical milling insert with chamfer 20

Conclusion 23

Reference 25

order

CNC machine tools are the product of the comprehensive application of high and new technologies such as computer, automatic control, automatic detection and precision machinery. Its appearance and great benefits have attracted wide attention from the scientific and industrial circles all over the world. The development of CNC machine tools is the only way to measure the technological transformation of a country's machinery manufacturing industry, and it is also the basis of future factory automation. A large number of people and engineers who can master the programming, operation and maintenance of CNC machine tools are needed. However, there are still "six shortages" in our equipment manufacturing industry, that is, "scale, strength, quantity, speed, efficiency, system, originality, single machine, complete sets, export and grade." At present, the conditions for revitalizing China's machinery and equipment manufacturing industry have been met, and the timing is also favorable. With a high sense of mission and responsibility, we should take more effective measures to overcome the difficulties in development and build China from a manufacturing power into one of the world-class manufacturing bases.

I chose this topic because this part includes both CNC lathes and CNC milling machines. We made a general summary of what we have learned. This graduation project is mainly divided into four aspects: 1. Overview; 2. Macro programming of lathe: 3. Macro programming of milling machine: 4. Through the process analysis of the parts, we can deeply and comprehensively understand the parts, make necessary modifications to the structure and technical requirements of the parts in time, and then determine whether the parts are suitable for machining on CNC machines, which CNC machines are suitable for machining, and then analyze which processes or procedures should be completed on a certain machine tool.

Selecting a positioning datum; On the one hand, the positioning datum of parts should ensure the correctness of the mutual position between the machined surfaces of parts after repeated clamping, on the other hand, it should meet the characteristics of centralized working procedures of machining centers, that is, machining as many surfaces as possible on parts in one installation. The positioning reference is preferably an existing surface or a hole on a surface. Then determine the processing methods and schemes of all processing surfaces; Select tools and cutting parameters. Then the processing scheme is drawn up, the processing sequence of each step is determined, and the adjacent steps are divided into one process, that is, process division. Finally, other processes, such as ordinary machining process, are inserted and connected into the sequence of NC machining processes, and the NC machining process route of parts with specified requirements is obtained. Process design is to divide each process through process analysis, and then use NC machining workpiece installation and zero adjustment card to display the parts according to the number of processes to make them more clear. Look up the table to fill in the NC machining process card, the workpiece installation and zero adjustment card, and finally draw the trajectory diagram, first hand-painted and then use MASTERCAM. Finally, programming is divided into manual programming and automatic programming. Here, calculation is used first, and then manual programming is used. The whole design is completed. Finally, let's process the parts on the CNC lathe to meet the requirements.

The wide application of numerical control technology has brought profound changes to the production mode and product structure of traditional manufacturing industry. It also brings new opportunities and challenges to the traditional mechanical and electromechanical majors. Through this graduation project, our graduates can be better familiar with CNC lathes, determine the processing technology, learn to analyze parts and master CNC programming. Lay a good foundation for the coming work. The above answer comes from:/html/44-3/3046.htm.