| With the improvement of my country’s urbanization level,the demand for my country’s electricity is also increasing,which requires the performance of power fittings on transmission lines to become more efficient.The bowl head hanging plate is a fitting used to connect the suspension clamp and the insulator string on the transmission line.It serves as a fixed wire and insulation.Therefore,its performance can directly affect its power transmission.The safety of the line.At present,the steel power fittings produced by most domestic enterprises are basically made of 45 steel,35CrMo and other materials,using quenched and tempered heat treatment,with low strength and low temperature resistance,and the product structure is bulky.This article is based on the new material 22SiMnCrNi2MoA steel,which is based on the bowl-tou hanging board,to study the heat treatment process for obtaining high strength and toughness and the chemical composite plating process to improve its corrosion resistance and wear resistance.Finite element analysis and structural optimization to achieve the purpose of high-performance bowl head hanging plate.The main research contents are as follows:1.The 22SiMnCrNi2MoA steel was quenched at 860℃,870℃,880℃,890 ℃ and tempered at 200℃,300℃,400 ℃,500℃,and subjected to tensile and low temperature impact tests.The structure was analyzed,and 22SiMnCrNi2MoA steel was obtained.After quenching at 860℃ and tempering at 200℃,the best combination of strength and toughness can be obtained.The yield strength is 1370MPa,the tensile strength is 1550MPa,and the impact absorption energy at-40℃is 52.7J.2.Taking the deposition rate of the coating as an index,through orthogonal experiments,the optimized process ratio of Ni-P electroless plating on 22SiMnCrNi2MoA steel was obtained:34g/LNiSO4·6H2O,30g/LNaH2PO2·H2O,17g/LC6H8O7,27ml/LC3H6O3;On the basis of the Ni-P optimization process,Ni-P-nano-SiO2 chemical composite plating is carried out to obtain a composite plating layer with nano-SiO2 uniformly dispersed and deposited;the corrosion resistance test in 3.5%NaCl solution shows that the content of sodium hypophosphite is At 20g/L,the Ni-P chemical coating has the best corrosion resistance.The Ni-P-nano-SiO2 chemical composite coating based on this has further improved corrosion resistance,and its corrosion resistance is better than hot-dip galvanizing;friction and wear Tests show that the wear resistance of the Ni-P-nano-Si02 chemical composite coating based on 20g/L of sodium hypophosphite is better than that of the Ni-P chemical coating and the hot-dip galvanizing layer.3.Through the finite element analysis of the bowl head hanging plate,a finite element model is established,and the stress distribution of the bowl head hanging plate under force is obtained,and the stress and strain test is carried out by the strain electrical measurement method.The test results and the calculation results are in error Below 5%,there is good consistency,which verifies the reliability of the finite element model,and also provides a basis for the next optimization analysis of the bowl head hanging plate;according to the original bowl head hanging plate finite element analysis results,The size is optimized,the transition fillet between the bowl head and the hanging plate is changed,and the middle waist thickness of the inner cavity side wall of the bowl head seat is reduced.The stress at the transition between the bowl head and the hanging plate is reduced,and the quality of the bowl head hanging plate is reduced by approximately 8.5%,the overall optimization effect is obvious;the structure of the original bowl head hanging plate is optimized,and the double bowl head hardware is designed.After the structure optimization,the overall stress of the double bowl head hardware is significantly reduced. |
