Development Of CAD System For Progressive Die Of Heat Exchange Fin

Stamping die products are widely used in machinery industry,daily supplies and other fields,in the national economic system occupies a pivotal position.Heat exchange fin progressive die as a kind of precision,complex,long life of continuous stamping die,the product is mainly used in the refrigeration field of many equipment,such as air conditioning,refrigerator,ship and automobile heat exchanger,etc..The quantity and production of air conditioners in China are in the forefront of the world,and the demand for heat exchange fins is huge.Therefore,it is of great practical significance to develop a CAD system for heat exchange fin progressive die.The drawing,blanking,flanging size calculation,force calculation and drawing strength checking formulas in the design process of heat exchange fin progressive die are given.The formulas for calculating the maximum tensile stress on the drum wall of the first and non-first drawing were derived.The theoretical analysis showed that the maximum tensile stress ?Fmax1,of the drum wall of the first drawing decreased significantly at first and then decreased slowly with the increase of the diameter of punch d1 in the first drawing.Under the same blank thickness t,with the blank diameter D increasing,?Fmax1 decreases first,and when the blank diameter is about 15mm,?Fmax1 decreases to the minimum,and then increases significantly.Finite element simulation for finned drawing with aperture of 7.6mm and 5.2mm was carried out.The results show that the maximum tensile stress occurs at the point where the punch fillet is cut to the straight wall,and the finite element simulation can better reproduce the wrinkling phenomenon caused by aluminum foil stamping and drawing.The smaller the drawing coefficient is and the larger the gap between drawing coefficients is,the more serious the wrinkling degree is with the increase of punching passes.At the same time,the rationality of the formula for calculating the maximum tensile stress of the cylinder wall for the first and non-first drawing is verified.The connection between SolidWorks and SQL Server database is realized by ADO.NET technology,and the parameterized driven modeling of parts is completed.The parameterized templates of pressing,drawing,punching,trimming,guiding,vertical cutting,feeding,cross-cutting sub-die and inclined wedge mechanism were established.The top down parameterized program was explained in detail in combination with the flow chart of punching sub-die and inclined wedge mechanism,and the development of heat exchange fin progressive die CAD system was realized.The heat exchange fin progressive die CAD system was used to complete the design of the heat exchange fin progressive die.According to the V-shaped corrugated fin product drawing provided by the customer company,the dimensions of the key parts of the deep drawing,punching and flanging sub-die were calculated.According to the calculation,the press was selected and the designed die was processed and assembled.The finned with good quality was obtained and the feasibility of the CAD system for the progressive die of heat exchange fins was verified by the.stamping experiment on the 0.1mm thickness aluminum foil mounted on the press.Figure[94]Table[14]Reference[63]...