Thermal treatment process for inlaid steel guide rail
A technology of guide rails and steel inserts, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of no significant improvement in effect and influence on quenching and cooling
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example 1
[0036] Workpiece selection: the material is 40Cr hot-rolled steel plate; cutting according to length×width×thickness to obtain a steel plate with a blank size of 400mm×190mm×10mm.
[0037] The basic technological process is: blanking—heat treatment normalizing—machining milling around—machining drilling—heat treatment salt furnace heating—oil quenching—special tooling to flatten guide rail plate—cooling—tempering—machining grinding upper and lower sides—grinding around .
[0038] In addition to considering the thin plate parts (thickness of the example is 10mm, which is much smaller than the 25mm~30mm of similar general steel-inlaid guide rail blanks), the initial inspection conditions have a corresponding reduction in quenching time, and the addition of special tooling to flatten the guide rail plate, other process conditions, It can be the same as the existing process conditions. Of course, the time of the salt furnace heating step can also be reduced correspondingly due to t...
example 2
[0047] Adjust process parameter quenching time 60 seconds, the oil outlet temperature 192 ℃ of measurement, other process conditions are with example 1, use as attached figure 1 and 2 The special tooling shown is to flatten the steel plate, and the pressing time is 3 minutes. It is determined that the hardness of the workpiece after the flattening step reaches HRC49.
[0048] Deformation measurement:
[0049] steel plate state processing method Deformation After oil quenching Flattening without pressure plate, natural cooling 0.67mm Tempering after oil quenching Flattened by special tooling, natural cooling 0.09mm
[0050] The same group of samples were measured, and the deformation characteristics were basically similar to Example 1, with a slightly higher maximum deformation.
[0051] Roughly grind both sides of 10mm size, after grinding away 0.5mm, 90% of the area will be ground up. When grinding to 9mm, both sides are completely grou...
example 3
[0054] Adopt identical workpiece with example 1 and 2, quenching time is 45 seconds, 65 ℃ of oil temperatures, 182 ℃ of workpiece oil outlet temperatures; Other processing conditions are identical. The hardness reaches HRC48 after oil quenching. After oil quenching, press for 5 minutes, tempering time is 45 minutes, tempering temperature is 260°C, and the hardness after tempering is HRC46.
[0055] Deformation measurement:
[0056] steel plate state processing method Deformation After oil quenching Flattening without pressure plate, natural cooling 0.75mm Tempering after oil quenching Flattened by special tooling, natural cooling 0.07mm
[0057] The same group of samples was measured. In this group of samples, the heat treatment process according to this program is quite different from that of the traditional process. The minimum deformation of this program can reach 0.07mm, while the minimum deformation of the traditional process is only ...
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