The Key Parameters Of Iron Roughneck’s Tong Dies Optimization Design

In the oil field of the automatic drilling production,The iron roughneck is the mostadvanced equipment of pipe handling operation and one of the most important automaticequipment which can complete connection of the pipe,cash and other equipment.Through the survey and analysis fond that a lot of tong dies and drill pipe were scrapped inthe oil companies every year,the main reason for tong dies scrap is tooth tip wear andfracture,the main reason of drill pipe scrap is tapping clamp fang marks. Tong dies are keycomponents of the iron roughneck,whether the tong dies is good or not has a great effect to theworking efficiency of the iron roughneck and the service life of drill pipe and casing whichcontact with tong dies,so it is very important for tong dies’s key parameters to be optimizedand design.First,the high quality of tong dies must have enough friction coefficient,in order to makesure tong dies can grape drill pipe reliably;Second,under the condition of high torque force thedrill pipe and casing are not bitten by tong dies.This thesis through the theoretical analysis fortong dies’s related parameters,such as tooth type Angle,distribution of tooth surface,plasticityyield criterion,bite depth and equivalent friction coefficient etc to get the interrelation betweenthe parameters and the impact of parameter changes on the tong dies’s work.By applying the orthogonal optimization method for tooth type Angle,tooth heigh and teethspacing to optimize design the results of optimization design is that tooth type Angle is1100,tooth height is2mm,teeth spacing is4mm.By applying the ANSYS for tong dies and drill pipe to contact finite element analysis,theresult of calculation is that there are maximum stress in tong dies contact with the drillpipe,The maximum stress within the allowable stress values of this thesis.There is a markdepth in Drill pipe contact with tong dies,the value meets the need of allows the tooth depthvalue in this thesis.In this thesis,Maximum stress and tooth mark depth are meet the needs ofoptimization design.