Device for offline evaluating rigidity of stretch reducing mill for steel pipe

Abstract

The invention provides a device for offline evaluating the rigidity of a stretch reducing mill for a steel pipe and belongs to the technical field of the measuring of stretch reducing mills for steelpipes. The device comprises a hydraulic cylinder, a flange, a flexible device, a copper spherical cushion, a horizontal force measuring rod, an upper positioning beam, an upper fixing plate, a displacement sensor fixing frame, a fixing stand, a radial force sensor, a force cushion block, an axial force sensor housing and a left-right positioning beam. After all the parts are assembled and positioned, the flange, the copper spherical cushion and the horizontal force measuring rod are pushed by a piston rod of the hydraulic cylinder to enter a stretch reducing mill rack; through the tapered force cushion block, three rolls in the stretch reducing mill rack are propped open, thereby acquiring the simulated displacement of the rolls of the stretch reducing mill under the action of rolling force; and through a computer data real-time acquisition system, force and displacement signals are recorded, stored, outputted and displayed. The device achieves the function of offline evaluating the rigidity of the stretch reducing mill; the measuring precision is high and the service life is long; and meanwhile, the size of the force cushion can be changed according to the pass sizes of differentstretch reducing mills, and thus the device is high in applicability.

Description

technical field [0001] The invention relates to the field of stiffness measurement of a steel pipe tension reducing machine, in particular to evaluating the stiffness of a tension reducing machine by an off-line means. Background technique [0002] As the last plastic forming process in the production of seamless hot-rolled steel pipes, the tension reducer plays an important role in the shape and dimension accuracy of the seamless steel pipes delivered in the hot-rolled state. The tension reducing process not only determines the accuracy of the outer diameter of the steel pipe, but also has an important influence on the wall thickness of the pipe. In addition, the inner and outer surface defects of the steel pipe mainly come from the tension reduction process. As the main equipment of this process, the tension reducing frame, its assembly, processing quality and wear have a great influence on the quality of rolled steel pipes. After years of use, there is no method to quan...

AI Technical Summary

Problems solved by technology

After years of use, what changes have taken place in the stiffness of each tension reducing machine, there is no method to quantitatively characterize it, and there is no judgment standard

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