Numerical control fine-grinding quality control method of rail welding joint

Abstract

The invention relates to a numerical control fine-grinding quality control method of a rail welding joint; longitudinal temperature and flatness data of a welding joint region are obtained through on-line actual measurement, a flatness curve measured actually is converted into the flatness curve corrected by temperature and removing temperature effect according to the relation of temperature change and rail flatness variation, and the parameters such as grinding position, range, feed rate and the like can be calculated by the corrected flatness curve, the fine-grinding process can be automatically and flexibly controlled by a programmable logic controller according to the calculated fine-grinding parameters, and the corrected flatness curve of the rail joint after each fine-grinding is measured again, the fine-grinding parameters are reset to perform next round of fine-grinding, until the measured corrected flatness curve meets the standard requirements. The method can perform automatic whole-course fine-grinding to the rail welding joint ground coarsely, the fine-grinding process has high automation degree and low fine-grinding cost, the welding joint ground finely has smooth appearance and good flatness, and no depressed joint can be ground; the method is convenient for data traceability, analysis and responsibility.

Description

technical field [0001] The invention relates to a method for controlling the quality of on-site welded joints of rail transit seamless line rails by numerical control fine grinding. Background technique [0002] The rapid development of high-speed and heavy-duty seamless lines puts forward strict requirements on the quality of seamless lines. The rails are first welded in the rail welding factory to form long rails of 250-500 meters, and then transported to the site for long rail welding to form seamless lines. The straightness of rail welded joints is an important indicator of the appearance quality of seamless lines. The railway industry standard TB / T1632.1-2005 of the People's Republic of China "Rail Welding" also specifies the straightness index of the rail welded joints driving surface and guide surface. corresponding regulations. Grinding is one of the important means to ensure that the straightness of rail welded joints is stable and up to standard. Grinding is also...

AI Technical Summary

Problems solved by technology

[0003] The grinding of welded joints in the rail welding factory is divided into rough grinding and fine grinding, which can better complete the rail grinding work, but the fine grinding equipment is large in size and expensive, and cannot be used for on-site operations

[0004] In the grinding process of the existing on-site grinding equipment, the profiling wheel is used to move back and forth in the longitudinal direction of the rail to imitate grinding. The grinding actions such as the rotating motion of the imitation grinding guide frame driven by it are all manually operated and controlled by human experience and observation. The degree of automation is low, the labor intensity is high, the quality of imitation grinding is low, and the precision is poor. It is easy for the operator to weld the joints of the rails. Low joints lead to scrap rewelding

In addition, because the rotating grinding wheel is used to grind the welded joints of the rails during imitation grinding, the uneven temperature rise of the welded joints of the rails will cause changes in the flatness of the rails. The straightness data measured directly after grinding ignores the flatness caused by different temperature rises. The straightness changes, so it cannot truly reflect the straightness of the welded joint of the ground rail after cooling

The flatness error of the test is large, and the qualified rate of the rail welded joint is low