I. Basis for the selection of the topic
1. Thesis (design) title
CNC turning machining programming and machining simulation of disk and sleeve parts.
2.Research Area
CNC Machining, CNC Programming, CNC Technology.
3. The theoretical significance and application value of the thesis (design) work
With the popularization of network communication, intelligent information processing, multimedia technology, the popularization of CNC technology is more and more widely used, more and more in-depth, CNC technology is developing in the direction of openness, integration, intelligence and standardization. China is now in the development of the development of industry, can not be separated from the CNC processing. Due to the high degree of automation of CNC machining, high productivity, stable processing quality, easy to establish computer communication networks, etc., so at this stage of the study of CNC turning machining of disk and sleeve parts has a high practical value for the development of China's industry.
Numerical control technology is to digital programming to achieve the control of machinery or other equipment to work automatically. The trend of world economic development shows that the manufacturing industry is the cornerstone of a country's economic development and machinery manufacturing technology is an important guarantee of a modernized economy. In today's world, the highly developed manufacturing industry and advanced manufacturing technology has become an important symbol to measure a country's comprehensive economic strength and scientific and technological level, and become a key factor for a country to win in the competitive international market. In the process of economic globalization, with the transfer of labour- and resource-intensive industries to developing countries, China is really becoming an important base in the world gradually. However, due to the late start of China's industrial process, compared with the international advanced level, the manufacturing industry and manufacturing technology still exists in the stage of poor shuffle, so we must strengthen the research on manufacturing technology, boldly into? Technological innovation, while actively introducing and digesting foreign technologies and ideas, as soon as possible to form China's independent innovation and leapfrog development of advanced technology system. Make my over manufacturing industry invincible.
The purpose of this topic requires us not only to be familiar with CNC technology, but also its programming, processing simulation and a series of operations to have an understanding of the more connected with the production internship, but also the application of CAD/CAXA drafting software, so that we have a deeper understanding of the basics.
4. Overview of current research and development trends
The greatest scientific and technological achievements of human society in the 20th century is the invention and application of computers, computers and control technology in machinery manufacturing equipment is the most significant technological advances in the development of manufacturing industry in the century. Since 1952, the United States of America's first CNC milling machine came out so far has experienced 50 years. CNC equipment, including: car, milling, boring, grinding, stamping, machining centers, electrical processing and various types of special machines, forming a huge family of CNC manufacturing equipment, annual worldwide production of 10 to 20 million units, the output value of tens of billions of U.S. dollars.
China's CNC machine tool manufacturing industry in the 80's had a high-speed development stage, many machine tool factories from traditional products to achieve the transition to CNC products. But in general, the technical level is not high, poor quality, so in the early 1990s faced with the national economy from the planned economy to the market economy to transfer adjustments, experienced a few years of the most difficult recession, when the production capacity fell to 50%, the inventory more than 4 months. From 1995, "Ninth Five-Year Plan" after the country from expanding domestic demand to start the machine tool market, strengthen restrictions on imports of CNC equipment for approval, investment focus on supporting key CNC systems, equipment, technology research and development, the production of CNC equipment has played a great role in promoting, especially after 1999, the state to the defense industry and key civilian Industrial sector to invest a large amount of funds for technological transformation, so that the CNC equipment manufacturing market is booming. From the August 2000 Shanghai CNC machine tool exhibition and April 2001 Beijing International Machine Tool Exhibition, you can also see the prosperity of a variety of products.
The application of CNC technology not only to the traditional manufacturing industry has brought about a revolutionary change in the manufacturing industry has become a symbol of industrialization, and with the continuous development of CNC technology and the expansion of the field of application, he is on the national economy and people's livelihood of a number of important industries (IT, automotive, light industry, medical care, etc.) of the development of the role of an increasingly important, because of the equipment required by these industries, the digitalization of the development of the modern era has been the big Trend. From the world's current trends in the development of CNC technology and its equipment, its main research hotspots are the following aspects. ① high speed, high precision and high efficiency, ② flexible, ③ process composite and multi-axis, ④ real-time intelligence, ⑤ digital, ⑥ integrated and so on.
In summary, the development of CNC technology is synchronized with the development of modern computer technology, electronic technology, but also according to the needs of production development. Now CNC technology has matured, the development will be deeper, wider and faster. The future CNC system will make the machinery better and cheaper.
Two, the thesis (design) research content
1. Focus on solving the problem:
(1) writing turning machining program.
(2) Using simulation software for CNC machining simulation.
2. Several major aspects of the proposed research (outline of thesis writing or design ideas):
(1) Analyze the disc sleeve type drawings.
(2) Define the machining program of the parts and develop the machining process route.
(3) Three-dimensional modeling of the workpiece.
(4) Select machine tools, machining methods, cutting tools and so on.
(5)Generate tool trajectory and machining program.
(6) Trajectory simulation and modification of machining program.
3. The expected results of this thesis (design):
Able to skillfully use the knowledge gained to analyze the parts drawings, contact with the knowledge learned in the production internship to formulate the machining route, master its machining process and method and program it. Can use simulation software to simulate the processing, learn the operation steps of the machine tool. Find all kinds of related information, learn to use all kinds of manuals, develop a set of machining program, complete the programming, submit instructions.
Three, thesis (design) work arrangement
1. The main research methods to be used (technical route or design parameters):
(1) through internships and research to obtain the workpiece drawings, consult the literature in Chinese and foreign languages.
(2) According to the drawings, clarify the technical requirements and processing characteristics of the workpiece.
(3) Apply the knowledge gained to formulate the machining process of the workpiece.
(4) According to the technical requirements and characteristics of the analyzed drawings, use CAXA to perform three-dimensional modeling of the workpiece.
(5) Develop workpiece CNC machining program, machine tool selection, tool path, cutting dosage.
(6) Use CAXA to generate toolpaths and generate machining programs for the workpiece.
(7) Use simulation software to simulate the processing and modification of the machining program.
2. Thesis (design) progress plan:
Week 1-4: collect, read, organize, translate relevant literature, understand the current situation and development trend of domestic and foreign CNC technology, to understand the content of the workpiece to be designed, and write the opening report;
Week 5-6: the workpiece to be Focus on analysis, understanding the structure of the workpiece, clear workpiece processing program, the preliminary development of processing technology route, the use of AutoCAD, CAXA were two-dimensional, three-dimensional modeling;
The 7th-9th week: the use of CAXA software to complete the programming, generation of tool trajectory and G code;
The 10th -13 weeks: the use of simulation software for tool trajectory simulation and G code modification;
The 14th-15th week: finishing the design specification;
The 16th week: prepare for the defense.
IV. Literature Review and Literature Review
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