Design And Optimization Of Axial Impact Loading Device Based On Tubular Coil

Powder metallurgy is one of the most important parts in the powder metallurgy industry.The research on the corresponding forming technology is the key to the development of powder metallurgy.In recent years,due to the emergence of electromagnetic impact compaction technology,the powder metallurgy products have achieved a breakthrough in many aspects,such as the increase of the density,the applicability of the material,the realization of the complex shape,the high performance and low cost.Powder metallurgy products have been applied in more and more fields.The key to obtain high density metal powder products in the process of metal powder impact compaction is to improve the impact force and pressing speed.Therefore,the use of more efficient loading device has to solve the problem.Combined with the current high-speed densification technology,this paper designs a new type of axial impact loading technology based on tubular coil,which has the characteristics of simple structure and high safety.By using the finite element software ANSYS,this paper establishes the corresponding electromagnetic analysis model,studies the influence of relationship between the geometry and the shape of the tubular coil on the punch,designs the tubular coil to match the axial impact loading device,and optimizes the electromagnetic axial impact loading device to obtain sufficient pressing force and pressing speedThe main contents of this paper are as follows:Firstly,by studying the working mechanism of the axial impact loading device,the basic structure of the loading device is designed.The finite element model established by ANSYS finite element simulation software is used to analyze the influence of the magnetic isolation ring angle,relative position,thickness and length on the electromagnetic force characteristic.The experimental test system is constructed on this basis.By using this test system,the electromagnetic impact experiment was carried out and the electromagnetic force characteristic curve and impact velocity are measured.By comparing the experimental results with the simulation results,it is in line with expectation.Therefore,the correctness of the finite element simulation is verified.At the same time,it provides the conditions for improving the electromagnetic force and the impact speed by changing the process parameters.Secondly,the analytical model of isosceles trapezoid coil is established based on the analysis of the traditional rectangular coil.The finite element numerical simulation of tubular coil is carried out by ANSYS Multi-physics field.The influence of the cross-sectional area,width and the ratio of the left to the right side of the coil on the axial electromagnetic force is studied.This paper establishes the optimum parameter computational formula of geometry of electromagnetic coil sectional area,find that under the condition of equal effective sectional area the axial electromagnetic force of trapezoidal coil is larger,when the cross-sectional area of the tubular coil is 360mm2,the efficiency is 5.57% higher and effective travel is 23.08% more than that of the conventional rectangular coil.Finally,the finite element simulation and experimental results are comprehensively analyzed.Starting from the model size and excitation angle,the effect of model size and exciting change on the axial electromagnetic force and impact velocity are simulated by finite element software ANSYS,and designs the tubular coil to match the axial impact loading device,and optimizes the electromagnetic axial impact loading device,remarkably improve sufficient pressing force and pressing speed and thereby increase the density of metal powder compaction.