Rolling pacing-improving load distribution method of reversible single-rack four-roller rough rolling mill

Abstract

The invention provides a rolling pacing-improving load distribution method of a reversible single-rack four-roller rough rolling mill. The method comprises the following steps that a single grade of steel is stratified according to the width of plate blanks and total rolling passes of rough rolling, rough rolling setting and calculation parameters are stored, and a rough rolling load distributionmodel is established; the amplitude limiting value of a threading speed of each rough rolling pass is set according to rough rolling passes, wherein the amplitude limiting value of the threading speedof the first pass is 2.5m / s, the amplitude limiting value of the threading speed of the last pass is 4.5m / s, and the difference between the amplitude limiting values of the threading speeds of everytwo adjacent passes is not more than 1m / s; a grade of steel to be treated is provided, data of the rough rolling load distribution model are combined, and the threading speed and the amplitude limiting value of a rolling speed of the single grade of the steel are adjusted so as to satisfy the requirement that when the rolling speed of the steel of the grade is lower than the amplitude limiting value of the threading speed, the threading speed is kept consistent with the rolling speed, when the rolling speed of the steel of the grade is higher than the amplitude limiting value of the threadingspeed, the threading speed is set to be the amplitude limiting value, and meanwhile, when a current of a rough rolling motor is not overloaded, and the rough rolling mill does not slip, the actual rolling speed of the single pass reaches the maximum rolling speed.

Description

technical field

[0001] The invention belongs to the technical field of rolling, and in particular relates to a load distribution method of a reversible single-stand four-high roughing mill for improving the rolling rhythm. Background technique

[0002] At present, for a hot continuous rolling production line with only one four-high reversing roughing mill, the rolling rhythm of the roughing mill has become a bottleneck restricting the improvement of the rolling rhythm of the entire production line. The main factors affecting the rolling rhythm of the roughing mill are the total number of rolling passes, the strip threading speed and rolling speed of each pass, and the reduction rate of each pass. The existing rough rolling model only accesses the model settings according to the steel type, and calculates the required strip threading speed, rolling speed limit value, and reduction distribution strategy value. Since the principle of dividing the steel race is to classify stee...

Examples

Embodiment 1、 comparative example 1

[0052] The steel type is marked as steel type A, the size of the incoming slab is 230mm×1300mm×9900mm, the size of the intermediate billet is 41.7mm×1260mm×59m, and the total number of rolling passes is 5.

[0053] In Comparative Example 1, the rough rolling time before implementation of the scheme was 101 seconds, and Table 1 is the rolling parameter table of Comparative Example 1.

[0054] In Example 1, the strip threading speed of the first 4 passes is increased to near the limit value, and the rolling speed of each pass is gradually increased to near the maximum value according to the equipment capacity and process requirements. Table 2 is the rolling parameter table after the implementation of the scheme , the rough rolling time has been reduced by 16 seconds.

Embodiment 2、 comparative example 2

[0056] The steel type is marked as steel type B, the size of the incoming slab is 230mm×1300mm×9900mm, the size of the intermediate billet is 46mm×1270mm×53m, and the total number of rolling passes is 7.

[0057] In Comparative Example 2, the rough rolling time before the implementation of the scheme was 110 seconds, and Table 3 is the rolling parameter table of Comparative Example 2.

[0058] In Example 2, the strip threading speed of the first 3 passes is increased to near the limit value, and the rolling speed of each pass is gradually increased to near the maximum value according to the equipment capacity and process requirements. Table 4 is the rolling parameter table after the implementation of the scheme , the rough rolling time has been reduced by 14 seconds.

Embodiment 3、 comparative example 3

[0060] The steel grade is marked as steel grade C, the size of the incoming slab is 230mm×1300mm×9900mm, the size of the intermediate billet is 42mm×1276mm×56m, and the total number of rolling passes is 5.

[0061] In Comparative Example 3, the rough rolling time before the implementation of the scheme was 63 seconds, and Table 5 is the rolling parameter table of Comparative Example 3.

[0062] In Example 3, the strip threading speed of the first two passes is increased to near the limit value, and the rolling speed of each pass is gradually increased to near the maximum value according to the equipment capacity and process requirements. Table 6 is the rolling parameter table after the implementation of the scheme , the rough rolling time has been reduced by 7 seconds.

[0063] Table 1

[0064]

[0065] Table 2

[0066]

[0067] table 3

[0068]

[0069]

[0070] Table 4

[0071]

[0072] table 5

[0073]

[0074] Table 6

[0075]

technical field

[0001] The invention belongs to the technical field of rolling, and in particular relates to a load distribution method of a reversible single-stand four-high roughing mill for improving the rolling rhythm. Background technique

[0002] At present, for a hot continuous rolling production line with only one four-high reversing roughing mill, the rolling rhythm of the roughing mill has become a bottleneck restricting the improvement of the rolling rhythm of the entire production line. The main factors affecting the rolling rhythm of the roughing mill are the total number of rolling passes, the strip threading speed and rolling speed of each pass, and the reduction rate of each pass. The existing rough rolling model only accesses the model settings according to the steel type, and calculates the required strip threading speed, rolling speed limit value, and reduction distribution strategy value. Since the principle of dividing the steel race is to classify stee...

Examples

Embodiment 1、 comparative example 1

[0052] The steel type is marked as steel type A, the size of the incoming slab is 230mm×1300mm×9900mm, the size of the intermediate billet is 41.7mm×1260mm×59m, and the total number of rolling passes is 5.

[0053] In Comparative Example 1, the rough rolling time before implementation of the scheme was 101 seconds, and Table 1 is the rolling parameter table of Comparative Example 1.

[0054] In Example 1, the strip threading speed of the first 4 passes is increased to near the limit value, and the rolling speed of each pass is gradually increased to near the maximum value according to the equipment capacity and process requirements. Table 2 is the rolling parameter table after the implementation of the scheme , the rough rolling time has been reduced by 16 seconds.

Embodiment 2、 comparative example 2

[0056] The steel type is marked as steel type B, the size of the incoming slab is 230mm×1300mm×9900mm, the size of the intermediate billet is 46mm×1270mm×53m, and the total number of rolling passes is 7.

[0057] In Comparative Example 2, the rough rolling time before the implementation of the scheme was 110 seconds, and Table 3 is the rolling parameter table of Comparative Example 2.

[0058] In Example 2, the strip threading speed of the first 3 passes is increased to near the limit value, and the rolling speed of each pass is gradually increased to near the maximum value according to the equipment capacity and process requirements. Table 4 is the rolling parameter table after the implementation of the scheme , the rough rolling time has been reduced by 14 seconds.

Embodiment 3、 comparative example 3

[0060] The steel grade is marked as steel grade C, the size of the incoming slab is 230mm×1300mm×9900mm, the size of the intermediate billet is 42mm×1276mm×56m, and the total number of rolling passes is 5.

[0061] In Comparative Example 3, the rough rolling time before the implementation of the scheme was 63 seconds, and Table 5 is the rolling parameter table of Comparative Example 3.

[0062] In Example 3, the strip threading speed of the first two passes is increased to near the limit value, and the rolling speed of each pass is gradually increased to near the maximum value according to the equipment capacity and process requirements. Table 6 is the rolling parameter table after the implementation of the scheme , the rough rolling time has been reduced by 7 seconds.

[0063] Table 1

[0064]

[0065] Table 2

[0066]

[0067] table 3

[0068]

[0069]

[0070] Table 4

[0071]

[0072] table 5

[0073]

[0074] Table 6

[0075]

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