Design And Key Technology Research Of Spiral Bellows Forming Equipment

As a high efficient heat exchange pipe,spiral corrugated pipe is widely used in various types of heat exchangers.The quality of the spiral corrugated pipe has a crucial influence on the heat transfer performance of the heat exchanger.At present,the spiral corrugated pipe is mainly produecd by drawing forming,most of which are made of ordinary machine tools,resulting in low efficiency of spiral corrugated pipe forming,and the quality is difficult to guarantee.According to the principle of three-roll skew rolling,a new spiral corrugated pipe procesing equipment is designed to solve these problems above.The main contents are as follows:Firstly,the mechanical system of the new spiral corrugated pipe procesing equipment is designed.The mechanical system mainly includes four parts:machine frame,transmission system,rolling mechanism and auxiliary mechanism.Transmission system mainly includes pulley reducer and gear box,etc;rolling mechanism mainly includes tool post,roller system and radial feeding system,etc;auxiliary mechanism mainly includes centering mechanism and cooling system.Secondly,being the key mechanism of spiral corrugated pipe procesing equipment,the skew roller is designed.The key points of design about roller are determined and analyzed.According to the principle of envelope meshing and the method of spatial coordinate transformation,the surface equation of spiral corrugated pipe’s roller is deduced.On this basis,a set of special rollers is designed for spiral groove pipe and wave pipe.The three-dimensional model of the roller is established and the rolling simulation is carried out in the VERICUT software,which verifies the feasibility and precision of the design model.Thirdly,being the bearing structure of spiral corrugated pipe processing equipment,the machine frame and tool holder are checked and optimized.The three-dimensional model of tool holder and machine frame is built,and the static and dynamic analysis is carried out in the software ANSYS Workbench to check the strength and rigidity.Then the multi-objective optimization is carried out to choose the best optimization design to achieve the lightweight structure and improve material utilization.Finally,the spiral corrugated pipe procesing equipment is assemblied and adjusted to verify whether the molding equipment to achieve the desired function.Concrete solutions are put forward to solve the problems occurred in the assembly process;the axial and radial deviation during the rolling process is analyzed theoretically,the related structure is improved and fed back to the drawing,and the design scheme of spiral corrugated pipe processing equipment is further optimized;at the same time,deviation is corrected to rolling out the standard spiral corrugated pipe.