Analysis Of The Worm Gear Tooth Surface Of The Metering Pump And Research On The Fly-Cutter Profile Design

Metering pumps which is a precision proportioning equipment are widely used in various fields because the transmission structure is compact,accurate measurement,can achieve stepless adjustment.Worm gear as an important transmission mechanism in the metering pump and the transmission effect will directly affect the metering pump work smoothly.In this thesis,the J-X type metering pump was taken as an example in the manufacturer of glass fiber reinforced and do research and finite element analysis for its worm gear tooth surface.In this thesis,the classification,structure and working principle of J-X type metering pump were introduced briefly,besides the worm gear pair transmission theory was analyzed.Take the ZA type worm drive as an example,the spiral surface equation of ZA type,the spiral tooth surface equation,the profile equation of transverse section and the normal equation were deduced.According to the linear equation of the tool cutting edge,the failure modes and causes of the worm gear drive in the metering pump were analyzed in detail.In order to reduce the cost and shorten the cycle,the worm gear was machined by the way of fly-cutter axial installation and the tooth equation of fly-cutter,which was introduced and the solving process of the equation was summarized.The tooth profile curve is drawn,and the error between the blade profile of the linear blade and the profile of the tool according to the forming mechanism of the space helix is 0.12mm.Combined with the meshing principle of space engagement,the equation of worm gear tooth shape was solved by using the equation of flying tooth.According to the characteristics of milling worm wheel,SolidWorks2015 as the platform,the modeling method for the worm wheel is given first,then the assembled model and the motion interference inspection are finished.Then,the machining principle of the cutter is designed.Worm gear in the assembly with the worm without interference,while the conventional processing of the worm gear in the assembly of multiple interference,and the maximum size of the interference occurred 0.8mm3.Finally,the force of the worm gear in the metering pump is analyzed,which lays a foundation for further analysis of the force of the worm gear tooth surface.On the basis of finite element analysis theory,ANSYS Workbench was used to analyze the static and transient dynamics of the worm drive,obtained how the stress and strain changed.The maximum equivalent stress was 56MPa in the static analysis,the maximum deformation occurred on the worm and the maximum deformation was 9.9806×10-6m.According to the stress and strain diagram of the worm gear,the maximum equivalent stress of the worm gear was 111.4MPa.Through the static analysis of the worm drive,it provided the method and the reference for the mechanical analysis of the worm in the metering pump.In the transient dynamic analysis,the distribution of the equivalent stress,contact state and the contact stress distribution of the worm drive under the same load in different meshing positions were obtained.The stress cloud diagram showed that the maximum equivalent stress and contact stress of the worm gear were at positions 4 and 6,respectively,and were 139 MPa and 249.66 MPa.As can be seen from the contact state of the stress cloud diagram that the contact area between the tooth tip and the tooth root was increased and the maximum contact area took place at the tooth root.The deformation of the worm gear was in line with the actual situation,the maximum stress within the allowable range of material strength.From the conventional dynamic analysis of the contact of the worm gear to know that the maximum contact stress of the worm gear was 309.21MPa and the maximum force of the tooth root was in line with the actual situation.Compared with the contact analysis of worm gear model derived by common CAD software,it is concluded that the contact force of worm gear machined by engagement theory is reduced by 17.65%compared with the conventional worm gear tooth surface.This method can improve the transmission accuracy of worm wheel and increase The stability of metering pump work.