First, the basis of topic selection
1. Thesis (design) topic
NC turning programming and machining simulation of disk sleeve parts.
2. Research field
NC machining, NC programming, NC technology.
3. Theoretical significance and application value of the thesis (design) work.
With the popularization of network communication, the intelligence of information processing and the practicality of multimedia technology, the popularization and application of numerical control technology are more and more extensive and in-depth, and numerical control technology is developing towards openness, integration, intelligence and standardization. China is now in the process of development, and the development of industry cannot be separated from NC machining. Because of the high degree of automation, high production efficiency, stable processing quality and easy establishment of computer communication network, it is of great practical value to study NC turning of disk sleeve parts at this stage for China's industrial development.
Numerical control technology is a technology to control the automatic work of machinery or other equipment through digital programming. The trend of world economic development shows that manufacturing industry is the cornerstone of a country's economic development, and machinery manufacturing technology is an important guarantee for modern economy. In today's world, highly developed manufacturing industry and advanced manufacturing technology have become an important symbol to measure a country's comprehensive economic strength and scientific and technological level, and are the key factors for a country to win in the fierce international market. In the process of economic globalization, with the transfer of labor and resource-intensive industries to developing countries, China is really becoming an important base in the world. However, due to the late start of China's industrialization process, compared with the international advanced level, there is still a gap between manufacturing industry and manufacturing technology, so we must strengthen the research on manufacturing technology and make bold progress. Technological innovation, at the same time, actively introduce and digest foreign technologies and ideas, and form an advanced technology system with independent innovation and leap-forward development in China as soon as possible. Let my manufacturing industry be invincible.
The purpose of this project requires us not only to be familiar with numerical control technology, but also to know a series of operations such as programming and machining simulation, and more to apply it to CAD/CAXA drawing software in connection with production practice, so as to have a deeper understanding of the basic knowledge.
4. Current research situation and development trend.
The greatest scientific and technological achievement of human society in the 20th century was the invention and application of computers. The application of computer and control technology in machinery manufacturing equipment is the most significant technological progress in the development of manufacturing industry in this century. It has been 50 years since 1952, when the 1 CNC milling machine in America came out. Numerical control equipment includes turning, milling, boring, grinding, stamping, machining center, electro-machining and various special planes, forming a huge family of numerical control manufacturing equipment, with an annual global output of100000 ~ 200000 units and an output value of tens of billions of dollars.
China CNC machine tool manufacturing industry had a high-speed development stage in 1980s, and many machine tool factories realized the transformation from traditional products to CNC products. But generally speaking, the technical level is not high and the quality is not good. Therefore, in the early 1990s, faced with the transfer and adjustment of the national economy from a planned economy to a market economy, it experienced the most difficult depression in recent years, when the production capacity dropped to 50% and the inventory exceeded four months. Since 1995 "Ninth Five-Year Plan", the country has started the machine tool market by expanding domestic demand, strengthened the examination and approval of restricting the import of CNC equipment, and mainly invested in supporting the research of key CNC systems, equipment and technologies, which greatly promoted the production of CNC equipment. Especially after 1999, the state invested a lot of technical transformation funds in the national defense industry and key civilian industries, which made the CNC equipment manufacturing market prosperous. The prosperity of various products can also be seen from the Shanghai CNC Machine Tool Exhibition in August 2000 and the Beijing International Machine Tool Exhibition in April 20001.
The application of numerical control technology has not only brought revolutionary changes to the traditional manufacturing industry, making the manufacturing industry a symbol of industrialization, but also played an increasingly important role in the development of some important industries (IT, automobile, light industry, medical care, etc.). ) With the continuous development of numerical control technology and the continuous expansion of application fields, the digitalization of equipment required by these industries has become a major trend of modern development. Judging from the development trend of numerical control technology and its equipment in the world, its main research hotspots are as follows. ① High speed, high precision and high efficiency; ② flexibility; ③ The process is complex and multi-axis; ④ Real-time intelligence; ⑤ Digitization; ⑤ Integration, etc.
To sum up, the development of numerical control technology is synchronized with the development of modern computer technology and electronic technology, and also developed according to the needs of production development. Now that the numerical control technology has matured, its development will be deeper, wider and faster. The future numerical control system will make machinery better and cheaper.
Second, the content of the paper (design)
1. Key problems to be solved:
(1) Write a turning program.
(2) Using simulation software to simulate NC machining.
2. Several main aspects to learn (writing an outline or designing ideas):
(1) Analyze the pattern of the sleeve.
(2) Make clear the processing scheme of parts and work out the processing route.
(3) 3D modeling of workpiece.
(4) Choose machine tools, processing methods and cutting tools.
(5) Generate tool path and machining program.
(6) Trajectory simulation and modification of machining program.
3. The expected results of this paper (design):
Can skillfully use the knowledge learned to analyze part drawings, formulate processing routes according to the knowledge learned in production practice, master its processing technology and methods and program. Simulation machining, a simulation software, can be used to learn the operation steps of machine tools. Find all kinds of related materials, learn to use all kinds of manuals, make a set of processing scheme, complete programming and submit instructions.
Third, the paper (design) work arrangement
1. Main research methods to be adopted (technical route or design parameters):
(1) Obtain drawings of workpieces through practice and investigation, and consult Chinese and foreign documents.
(2) According to the drawings, define the technical requirements and processing characteristics of the workpiece.
(3) Using the learned knowledge, work out the processing technology of the workpiece.
(4) According to the technical requirements and characteristics of the analysis diagram, the three-dimensional modeling of the workpiece is carried out by CAXA.
(5) Formulate the NC machining scheme, machine tool selection, tool path and cutting parameters of the workpiece.
(6) Using CAXA to generate tool path and workpiece processing program.
(7) Using simulation software to simulate machining and modify machining program.
2. Paper (design) schedule:
Week 1-4: Collect, read, sort out and translate relevant documents, understand the present situation and development trend of CNC technology at home and abroad, understand the content of the workpiece to be designed, and write the opening report;
Week 5-6: Focus on the analysis of the workpiece, understand the structure of the workpiece, make clear the processing scheme of the workpiece, initially formulate the processing route, and use AutoCAD and CAXA to build two-dimensional and three-dimensional models respectively;
Week 7-9: Use CAXA software to complete programming and generate tool path and G code;
Week10-13: Tool path simulation and G code modification are carried out by using simulation software;
Week14 ——15: Collate the design description;
Week 16: Prepare the defense.
Fourth, literature review and literature review
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