Research On Techniques To Improve The Manufacturing Precision Of Cold Forming Sectional Steel Equipment

For the cold forming sectional steel, dimensional precision is an important index that measures its quality and ability to occupy market. Research on techniques to improve the manufacturing precision of cold forming sectional steel equipment aims at improving the product's dimensional precision and quality. In this thesis, the relevant technical status and development trend in steel rolling or in section production, are firstly outlined. Then, the thesis tells the research status of rolling mill and flying saw which have a direct affection on the dimensional precision of cold forming sectional steel. Besides, it introduces the technology of cold forming sectional steel and the ways to control the dimensional precision in section and length of the product. At last, two examples are given to tell how to improve manufacturing precision by renovating equipment. According to the production specific and demand, the examples have put forward new methods from equipment to improve the dimensional precision of products concerning the condition of production line of rectangular metallic pipe in Hankou Cold Rolling Plant. By designing a low-cost , simple and effective fine adjustment mechanism and using a cycloid pin gear speed reducer, the adjustment distinguishability of common section rolling mill has greatly improved, which may limit the dimensional precision of products in a expected range;The flying saw uses Simatic PLC(Programmable Logical Controller) as the control core in stead of microprocessors, and selects Eurotherm DC Digital Drive to control the DC Motor. It has also been equipped with the control algorithm which is suitable for process flow and helps to improve manufacturing precision. All these measures make the new flying saw surpass the traditional one in dimensional precision of products, stability and reliability. The thesis has given the design precepts,structural design,control program and analysis of effect for the rolling mill and the flying saw. Finally, the advantages and disadvantages of the design are discussed, and several suggestions have been offered for further research work in the future.