基于CCD的复杂异形件预成形结构优化

Optimization on pre-formed structure for complex special-shaped parts based on CCD

将预成形件作为终成形坯料,并采用CCD算法对预成形结构进行优化设计,可减少预成形的复杂异形锻件飞边和锻造力。通过CCD算法,研究了不同截面参数L_(1)、L_(2)、H_(1)和R对预成形锻件的飞边面积ΔA和压强p的影响。结果表明:飞边面积ΔA会随着L_(1)、L_(2)、H_(1)和R的增加而逐渐增加;压强p随着L_(1)的增加会先减小后增大,随着L_(2)、H_(1)和R的增加而逐渐减小。最佳工艺参数为L_(1)=71.00 mm,L_(2)=14.81 mm,H_(1)=7.50 mm,R=6.50 mm,此时得到飞边面积ΔA=123.27 mm^(2),压强p=399.65 MPa,评价指标φ=1。模拟结果显示,金属流线分布合理,位移场符合实际流动规律。采用优化后的工艺参数成形的复杂异形锻件的表面光滑,无明显的折叠缺陷,证明了CCD算法对复杂异形件优化的可行性。

The pre-formed part was used as the final forming billet,and the pre-formed structure was optimized and designed using central composite design(CCD)algorithm to make the complex special-shaped forgings less flash in pre-forming and reduce the forging force.Therefore,the influences of different section parameters L_(1)、L_(2)、H_(1)and R on flash areaΔA and pressure p of the pre-forming forgings were investigated by means of CCD algorithm.The results show that the flash areaΔA gradually increases with the increasing of L_(1)、L_(2)、H_(1)and R,the pressure p first decreases and then increases with the increasing of L_(1),and gradually decreases with the increasing of L_(2)、H_(1)and R.The optimal process parameters are L_(1)=71.00 mm,L_(2)=14.81 mm,H_(1)=7.50 mm,R=6.50 mm,and the flash areaΔA=123.27 mm^(2),the pressure p=399.65 MPa,and the evaluation indexφ=1.The simulation results show that the distribution of metal streamline is reasonable,and the displacement field conforms to the actual flow laws.The complex special-shaped forgings formed by the optimized process parameters have smooth surfaces and no obvious folding defects,which demonstrates the feasibility of optimization for CCD algorithm on complex special-shaped parts.