Study On Forming Quality Analysis And Improved Die Of Bending Tube About Power Plant Boiler

The tube-bending technology has very important status which is widely applied in many fields such as vessel manufacturing industry, automobile industry, aerospace industry, ships manufacturing industry, and so on. The bending process is a greatly complex technology, so we can't reliably solve the actual production problem through the theoretical analysis simply. The empirical formula obtained by simplification mechanical model often has great errors with actual result;and adopting experience way often wastes lots of manpower and material resource.In this paper, we have finished computer numerical simulation for cold tube-bending process of Harbin Boiler Factory by MSC.MARC finite element analysis software, and have built a set of complete finite element tube-bending simulated system, which can exactly forecast tube-bending quality parameter and device driving force including orality, thinning rate and resilience value.Base on the analysis, we have improved the existing cold tube-bending die ,and have designed and manufactured a set of practicality combined adjustable tube-bending mould through. The primary cotent is as follows:1.We have finished bending force analysis,built relevant mechanics mould and deduced stress-strain field and energy formula. All of these settle a analysis foundation for tube-bending three-dimensional finite element numerical simulation.2. Combining computer simulation(finite element analysis),theory analysis with experiment,the paper study on quality forming factors such as orality,thinning rate and springback.On the view of simulation,we have resesrched the production process of tube-bending,and have forecasted transfiguration of the technics.This method can effectively solve the problems of tube-bending thickness asymmetry,which are caused by the chimb of tube-bending becoming thinning and the concave of tube-bending becomeing incressation when shape up by the tradition tube-bending technics.3. According to analyzing forming quality,we have improved the slot of the tube-bending machine,solved the problems that equipment cannot bend some thick tube .The combined accommodate die designed for minitype tube-bending machine have well solved the die waste problems.