Steel rail manufacturing method and manufacturing device
A manufacturing method and a manufacturing device technology are applied in the field of rail manufacturing and manufacturing devices, which can solve the problems of low martensite toughness and low bainite wear resistance, and achieve the effects of high hardness and increased cooling time.
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no. 1 Embodiment approach 〕
[0040] [the whole frame]
[0041] First, refer to figure 1 , the overall structure of the manufacturing apparatus of the steel rail which is 1st Embodiment of this invention is demonstrated.
[0042] figure 1 It is a schematic diagram which shows the whole structure of the manufacturing apparatus of the rail which is 1st Embodiment of this invention. Such as figure 1 As shown, a rail manufacturing apparatus 1 according to a first embodiment of the present invention is used to forcibly cool a rail having a cross-sectional shape of a product under specific cooling conditions conforming to required qualities such as desired hardness, and includes a cooling device 2 .
[0043] The cooling device 2 is a device for forced cooling of high-temperature steel rails described later. The high-temperature steel rails are high-temperature steel rails that are hot-rolled at a temperature above the austenite region in the rolling mill 4 and then divided by the cutting machine 5 according t...
no. 2 Embodiment approach
[0082] [the whole frame]
[0083] Next, refer to Figure 7 , the overall structure of the manufacturing apparatus of the rail which is 2nd Embodiment of this invention is demonstrated.
[0084] Figure 7 It is a schematic diagram which shows the whole structure of the manufacturing apparatus of the rail which is 2nd Embodiment of this invention. Such as Figure 7As shown, a rail manufacturing apparatus 1 as a second embodiment of the present invention is used to forcibly cool a rail having a cross-sectional shape of a product under specific cooling conditions that meet the required quality such as desired hardness, and includes a first cooling device 2 And the second cooling device 3.
[0085] The first cooling device 2 is a device for performing the first forced cooling described later on the high-temperature steel rail, which is hot-rolled at a temperature above the austenite region in the rolling mill 4 and then divided by the cutting machine 5 as the case may be. High...
Embodiment 1～ Embodiment 12
[0154] In Examples 1 to 12, the elongated rails hot-rolled at 900° C. were sent to the heat treatment apparatus 3 and fixed by the clamps 37 . And, from the state where the surface temperature of the head is 750° C., spraying of the cooling medium by the cooling heads 31, 33, 35 is started, and Figure 6 The cooling control process, the cooling rate of the head surface is controlled in the scope of the invention shown in Table 1. In this embodiment, the discharge pressure of the cooling medium that can realize the cooling rate or the heating rate consistent with the elapsed time after the start of forced cooling is determined in advance based on the past operating performance, etc., and the cooling medium is controlled accordingly. 31 and the injection of the head side cooling head 33 to control the cooling rate and heating rate. In addition, the cooling medium is air. Here, the heating rate in the phase transition in Example 7: -0.5°C / sec corresponds to the cooling rate: 0....
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Abstract
Description
Claims
Application Information
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