Numerical Simulation And Analysis Of Dimensional Accaracy Of Hollow Drill Steel Rolling

Hollow drill steels which act as drilling steel rods are named rock drill steels for short. Nowadays, the drilling method is the main method of processing rock drill steels in our country. In comparison with the hot piercing and hot stretching method, the drilling method is more promising, because the products'metallurgical quality in the drilling method is better which is the best advantage, and their finished products'life-span is longer. However, the eccentricity and the ellipse degress of actual production appears to be resolved such issues.In the past, research about hollow drill steels which act as drilling steel rods were mainly converged in strain and stress in work,life-span estimate,hot treatment technology as well as the choice of material. Few people researched rock drill steels about the process of rolling and they often adopted experimental or qualitative methods. Form cogging to rolling, the research on the influence law of the deformation of the rolled piece is still in its initial stage.Using Gleeble-3500 thermal-mechanical testing machine thermal simulation experiment, using single-pass compression test method to study the mandrel in the borehole with high manganese steel 80Mn14 the production of drill steel rolling process thermal deformation within the behavior. And reached a high manganese steel 80Mn14 high temperature flow stress model. The establishment of the model lays a foundation for establishing library materials.First investigated the use of hollow steel rod at home and abroad of the situation, briefly introduced the basic requirements of domestic drill steel and the production of the main drill steel production process overview. Expounds systematically the basic theory of rigid-plastic FEM. Using Pro-E software to build a three-dimensional model to DEFORM-3D finite element analysis software for the platform, the production of drill steel drill blanks to roll from the cogging to rolling 20 pass process was simulated. Clearly observed visually each pass rolling process of uneven deformation and distortion, each pass is obtained in the rolling of the rolling force, rolling moment, rolling temperature field, the distribution of equivalent stress, metal flow The velocity field and the rolling shape of the rolling deformation zone during each pass of the metal flow law. Pair of existing designs pass the numerical simulation indicates the design pass during the rolling process problems, optimizing the design of the process and perfect technological transformation has important practical significance plan. According to the simulation results, for dimensional accuracy analysis, and generate the actual production of drill steel eccentric reasons, and the pass system to improve it.