Normalizing control technology normalizing control program flow. The normalizing process is divided into five states. The state S10 is to preset and process parameters such as swing, time, and oxyacetylene flow in each stage of normalizing. The state S11 is a state in which the centering is performed when the gas is not supplied after the normalizing device is attached to the heater. After the normalizing control box is powered on, the program status is at S2 and automatically runs to the S10 state. After the alignment is completed, the oxygen acetylene, ignition, and normalizing start. The normalizing device automatically moves from the state S12 to the state S16. When the state S16 is completed, the normalizing device stops operating, and the oxygen acetylene is automatically turned off, and the normalizing is ended.
The process test uses U75V rail produced by Panzhihua Iron and Steel Co., Ltd., continuously welding 32 welding heads, manual normalizing 7 welding heads (heater evenly oscillates), and the rest adopts numerical control normalizing process parameters for joint normalizing treatment. According to the TB/T1632.4-05 standard of the Ministry of Railways, the NC normalized welding head passed the static bending test and the drop weight test smoothly. Numerical control normalizing and manual normalizing quality comparison analysis of numerical control normalizing and manual normalizing rail fracture quality in process test.
Observing the section of the manual normalized drop hammer joint, it shows that the heating time of the triangular section of the rail section is insufficient, the heating of the rail head and the rail bottom angle is obviously uneven, and the quality of the rail drop weight is not ideal. Observe the section of the NC normalized drop hammer joint, and the bottom right corner is the hand saw groove. After the rail is hit by the falling hammer, the base material is torn. The cross section of the horn shows that the weld zone is evenly torn and the mechanical properties are significantly improved.
Observing the section of the manual normalized rail joint through the static bending test, the pearlite structure of the rail head section and the rail bottom corner triangle area is obviously less than that of the NC normalized structure. It is concluded that the static bending bearing capacity of the NC normalized rail joint is increased by nearly 20% compared with the manual normalizing. The quality of the NC normalized rail joint drop hammer is good. Through the quality comparison study, the advantages and disadvantages of numerically controlled normalizing and manual normalizing.
Through the type test, it shows that after the NC joint normalizing, the static bending bearing capacity is greatly improved, and the normalizing effect of the rail head and the rail bottom corner area is ideal, and the normalizing quality is obviously better than the manual normalizing. The rail joint has good uniform heating effect, good flexibility control, reduces the labor intensity of the operator, improves the working efficiency, fully satisfies the post-weld heat treatment requirements of various rail types, and has a good promotion prospect.
(Finish)
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