CN112517640A - Cutting type cogging method using billet cutting type cogging mill - Google Patents
Cutting type cogging method using billet cutting type cogging mill Download PDFInfo
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- CN112517640A CN112517640A CN202011513261.5A CN202011513261A CN112517640A CN 112517640 A CN112517640 A CN 112517640A CN 202011513261 A CN202011513261 A CN 202011513261A CN 112517640 A CN112517640 A CN 112517640A
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Abstract
The invention belongs to the technical field of steel rolling process and steel rolling in metallurgical industry, and particularly relates to a cutting type cogging method by using a steel billet cutting type cogging machine, which is characterized by comprising the following steps of 1: preheating a steel billet to a temperature range between 600 ℃ and 1200 ℃; step 2: utilizing a billet cutting type cogging mill to longitudinally cut the billet along the rolling direction; and step 3: when the billet is cut, two cutting modes are available, wherein the first mode is cutting from four directions of the section of the billet; the second is to feed the cutting from two opposite directions of the blank; and 4, step 4: cutting and cogging the steel billet again after the primary cutting and cogging; and 5: and (4) performing compensation heating on the blank by using a temperature compensation device. The invention can realize the rapid and efficient cutting of the large-section billet into the small-section billet blank, thereby only using the finishing mill group to roll the steel product, reducing the investment and greatly reducing the production energy consumption.
Description
Technical Field
The invention belongs to the technical field of steel rolling process and steel rolling in metallurgical industry, and particularly relates to a cutting type cogging method by using a steel billet cutting type cogging machine.
Background
In the current steel rolling production technology, no matter continuous rolling production or semi-continuous rolling production, the main production mode adopted by billet cogging on a production line is that the billet which is heated to the rolling temperature enters a rough rolling unit and a middle rolling unit in sequence, so that the sectional area of the billet is gradually reduced through the pass rolling of the rolling units until the sectional area of the billet is reduced to meet the condition of entering a finishing rolling unit, and then the billet enters a finishing rolling unit and is rolled by the finishing rolling unit to form a final steel product. The prior art steel rolling technology such as steel rolling lines mentioned in patent numbers 202010042179.2, 201911325629.2 and 201610011589.4 are conventional production forms using the above billet cogging method. The disadvantages of this conventional production form are the large overall dimensions of the roughing mill train and the intermediate mill train, the heavy weight of the plant, the high energy consumption, the large installation capacity required, the large floor space and the large space occupied by the production line, the large construction investment in the rolling mill, the long construction period, and, in addition, the large spare part consumption and the high daily labor maintenance cost after the rolling mill production line is put into operation.
Therefore, if the small-section billet is directly used for rolling the steel products only through the finishing mill group, the equipment investment of more than 60 percent can be directly saved, the using area of more than 50 percent can be saved, the electric energy consumption of the production line can be reduced by more than 70 percent, and a large amount of equipment spare part consumption and manual maintenance cost can be saved. However, the acquisition of small-section billets, particularly low-cost small-section billets, is a major difficulty faced by the current technology, and the production of small-section billets capable of being directly finish rolled by using a continuous caster is not feasible in the current environment due to the difficulties in the aspects of technology, cost and safety, while the small-section billets can be easily obtained by using a reciprocating cogging mill, but the higher production cost of the small-section billets undoubtedly loses competitiveness and is also infeasible.
Disclosure of Invention
The invention aims to provide a cutting type cogging method by using a billet cutting type cogging mill, which realizes that a roughing mill set and a medium mill set in a traditional production line are replaced by a cutting type cogging mode of billet cogging, large-section continuous casting billets are efficiently cut into small-section billets, and then the small-section billets formed after cutting are directly rolled by a finishing mill set to produce steel products, so that the floor area of the production line is reduced, the space occupation is reduced, the equipment investment of the production line is greatly reduced, the energy is saved, and the consumption is reduced.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a cutting type cogging method by utilizing a billet cutting type cogging machine, which is characterized by comprising the following steps of,
step 1: preheating a steel billet to a temperature range between 600 ℃ and 1200 ℃;
step 2: utilizing a billet cutting type cogging mill to longitudinally cut the billet along the rolling direction;
and step 3: when the billet is cut, two cutting modes are provided, the first mode is cutting from four directions of the billet section, and the billet is directly cut into four billet billets with almost equal section areas at one time; the second is to cut the billet into two billet blanks with almost equal cross-sectional areas at one time by feeding from two opposite directions of the blanks;
and 4, step 4: after the billet is cut and cogging for one time, if the section of the billet is still larger than the section requirement required by entering a finishing mill group, cutting and cogging are carried out again, and the process is continuously repeated until the area of the minimum rectangular section after cutting and cogging reaches less than 10mm multiplied by 10 mm;
and 5: and for the condition that the temperature of the blank is too low to meet the requirements of cutting or subsequent steel rolling due to excessive cutting times or small cut section, compensating and heating the blank by using a temperature compensation device until the temperature of the blank reaches the rolling temperature.
In the step 3, when the steel billet is cut, the cutting pass is determined according to the size of the steel billet to be cut, and the cutting depth of each cutting pass is between 1mm and 30 mm.
In the step 3, when the steel billet is cut, the cutting and cogging speed is between 0.05m/s and 2m/s according to the material and the size of the steel billet.
A steel billet cutting type cogging mill is characterized by comprising a motor, a speed reducer connected with the motor, a cutter rotating shaft group connected with an output shaft of the speed reducer through a coupling, and a cutting cutter group arranged on the cutter rotating shaft group, wherein the cutter rotating shaft group is arranged in a frame of the steel billet cutting machine, and the motor is connected with an electrical control system.
The cutter rotating shaft group is an upper rotating shaft and a lower rotating shaft which are arranged in parallel, and the cutting cutter group is an upper cutting knife and a lower cutting knife which are respectively arranged on the upper rotating shaft and the lower rotating shaft.
The cutter rotating shaft group is a left rotating shaft and a right rotating shaft which are arranged in parallel, and the cutting cutter group is a left cutting knife and a right cutting knife which are respectively arranged on the left rotating shaft and the right rotating shaft.
The cutter rotating shaft group comprises an upper rotating shaft and a lower rotating shaft which are arranged in parallel, and a left rotating shaft and a right rotating shaft which are arranged in parallel, and the cutter rotating shaft group comprises an upper cutter and a lower cutter which are respectively arranged on the upper rotating shaft and the lower rotating shaft, and a left cutter and a right cutter which are respectively arranged on the left rotating shaft and the right rotating shaft.
The invention has the advantages that:
the cutting type cogging method using the billet cutting type cogging mill has the advantages of energy conservation, environmental protection and excellent investment economy, and the large-section billet can be rapidly and efficiently cut into the small-section billet by applying the production mode, so that the steel product is rolled only by using the finishing mill group; because the cutting type cogging mode of the invention does not need to be provided with a roughing mill group and a middle mill group of the traditional steel rolling production line, and the product production can be carried out only by using a finishing mill group, the investment for rolling steel products is greatly reduced, and the production energy consumption is greatly reduced; by applying the steel rolling production line, the electric energy consumption of each ton of steel can be reduced by more than 60%, the floor area of the production line can be saved by more than 50%, and the investment of the steel rolling production line with the same production energy can be reduced by more than 60%, so that the steel rolling production line has obvious economic and social benefits.
Drawings
Fig. 1 is a schematic diagram of a cutting method for cutting a steel billet to achieve billet cutting according to the present invention.
Fig. 2 is a schematic structural diagram of the billet cutting type cogging mill of the present invention.
FIG. 3 is a schematic structural view of the cutting knife assembly of the present invention arranged in four directions, namely, up, down, left, and right directions.
Fig. 4 is a plan view of a cogging line for cogging using a cutting method in the embodiment of the present invention.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
As shown in fig. 1 to 4, the method for split cogging using a billet split cogging mill of the present invention is characterized by comprising the steps of,
step 1: preheating a billet 8 to a temperature range of 600-1200 ℃;
step 2: utilizing a billet cutting type cogging mill to longitudinally cut the billet 8 along the rolling direction;
and step 3: when the billet 8 is cut, two cutting modes are provided, the first mode is cutting from four directions of the billet section, and the billet 8 is directly cut into four billet billets with almost equal section areas at one time; the second is to cut the billet into two billet blanks with almost equal cross-sectional areas at one time by feeding from two opposite directions of the blanks;
and 4, step 4: after the billet is cut and cogging for one time, if the section of the billet is still larger than the section requirement required by entering a finishing mill group, cutting and cogging are carried out again, and the process is continuously repeated until the area of the minimum rectangular section after cutting and cogging reaches less than 10mm multiplied by 10 mm;
and 5: and for the condition that the temperature of the blank is too low to meet the requirements of cutting or subsequent steel rolling due to excessive cutting times or small cut section, compensating and heating the blank by using a temperature compensation device until the temperature of the blank reaches the rolling temperature.
In the step 3, when the steel billet 8 is cut, the cutting pass is determined according to the size of the steel billet 8 to be cut, and the cutting depth of each cutting pass is between 1mm and 30 mm.
In the step 3, when the billet 8 is cut, the cutting and cogging speed is between 0.05m/s and 2m/s according to the material and the size of the billet 8.
A steel billet cutting type cogging mill is characterized by comprising a motor 1, a speed reducer 2 connected with the motor 1, a cutter rotating shaft group 5 connected with an output shaft 3 of the speed reducer 2 through a coupler 4, and a cutting cutter group 7 arranged on the cutter rotating shaft group 5, wherein the cutter rotating shaft group 5 is arranged in a steel billet cutting machine frame 6, and the motor 1 is connected with an electric control system.
The cutter rotating shaft group 5 is an upper rotating shaft 5-1 and a lower rotating shaft 5-2 which are arranged in parallel, and the cutting cutter group 7 is an upper cutting knife 7-1 and a lower cutting knife 7-2 which are respectively arranged on the upper rotating shaft 5-1 and the lower rotating shaft 5-2.
The cutter rotating shaft group 5 is a left rotating shaft 5-3 and a right rotating shaft 5-4 which are arranged in parallel, and the cutting cutter group 7 is a left cutting knife 7-3 and a right cutting knife 7-4 which are respectively arranged on the left rotating shaft 5-3 and the right rotating shaft 5-4.
The cutter rotating shaft group 5 comprises an upper rotating shaft 5-1 and a lower rotating shaft 5-2 which are arranged in parallel, and a left rotating shaft 5-3 and a right rotating shaft 5-4 which are arranged in parallel, and the cutting cutter group 7 comprises an upper cutting knife 7-1 and a lower cutting knife 7-2 which are respectively arranged on the upper rotating shaft 5-1 and the lower rotating shaft 5-2, and a left cutting knife 7-3 and a right cutting knife 7-4 which are respectively arranged on the left rotating shaft 5-3 and the right rotating shaft 5-4.
The invention relates to a cutting type cogging method by utilizing a billet cutting type cogging mill, which mainly comprises the step of directly cutting a hot steel billet by the billet cutting type cogging mill, thereby directly reducing the section size of the billet and achieving the aim of directly rolling by using a finishing mill.
The specific technical process of the invention is as follows: the billet 8 heated to the steel rolling temperature is longitudinally cut by a billet cutting type cogging mill to reduce the rolling section, the billet with a large section is cut into a billet with a small section by cutting, and the cut billet with the small section is subjected to product production rolling by a finishing mill group to form a final steel product.
The cutting-type cogging method of the present invention may be performed by using a cutting machine that feeds in four directions from the billet cross section or a cutting machine that feeds in two opposite directions, and the difference between the two is that: the former can directly open the billet 8 into four billets of almost equal cross-sectional area at a time, while the latter can only open the billet 8 into two billets of almost equal cross-sectional area at a time. In practical production application, the specific cutter head form needs to be selected according to specific conditions.
The cutting type cogging method of the invention is in any form of the cutting machine which uses four-direction cutting or two-direction cutting, the cutting pass needs to be determined according to the size of the billet to be cut, the larger the size of the section billet to be cut is, the more passes need to be cut, and the more the number of the required cutting machines or the number of the cutting tool bits need to be configured.
The single cutting depth of the cutting tool bit can not be larger than 40mm generally, so that the condition that the deformation of the steel billet is overlarge is avoided, and under the condition that the size of the steel billet is larger than 8, continuous cutting in the depth direction is realized through a plurality of steel billet cutting type cogging mills or a plurality of times of cutting head combination, so that the cutting depth is continuously increased until the steel billet is longitudinally cut.
Further, the shape of the cutter head of the cutting machine on the billet cutting type cogging mill needs to be changed according to the specific billet parameters and cutting requirements, and a single roller type cutting head or a single wafer type cutting head can be used, and a cutting head group consisting of the roller type cutting head and the wafer type cutting head can also be used.
Further, the size and specification of the cutter head of the cutting machine on the billet cutting type cogging mill are determined according to the specific billet size and cutting requirements.
Furthermore, the material of the cutter head of the cutting machine on the billet cutting type cogging mill needs to be according to the material of the cutting blank and the actual cutting requirement, and the cutting head needs to be manufactured by adopting different steel types, special ceramics or alloy materials according to the cutting of different blanks due to the need of cutting the hot billet.
The cutter head of the billet cutting type cogging mill can adopt an active cutter head, namely an active rotary cutter head which transmits power through the motor 1 and the speed reducer 2, and can also adopt a passive cutter head, namely a passive rotary cutter head which does not use power.
After the billet 8 is cut once, whether it is divided into two or four billets, if the section is still larger than the section requirement required by entering the finishing mill group, the billet can be cut again, and the process can be repeated continuously until the required section size requirement is met.
If the temperature of the blank is too low to meet the requirements of subsequent steel rolling due to excessive cutting times or too small cut section, the blank can be subjected to supplementary heating before rolling until the temperature of the blank reaches the rolling temperature.
The cutting type cogging method using the billet cutting type cogging mill can be applied to production lines or steel projects for producing steel products such as round steel, screw steel, square steel, flat steel, narrow band steel, flat-bulb steel, various section steel and the like.
The invention has the beneficial effects that the invention provides a cutting type cogging way which has energy-saving and environment-friendly properties and excellent investment economy and realizes cogging by using a cutting method. By applying the production mode, the large-section billet can be quickly and efficiently cut into the small-section billet blank, so that the aim of rolling steel products by using only a finishing mill group is fulfilled. The cutting type cogging mode of the invention does not need to be provided with a roughing mill group and a middle mill group of the traditional steel rolling production line, and can produce products only by using a finishing mill group, thereby greatly reducing the investment for rolling steel products and greatly reducing the production energy consumption. By applying the steel rolling production line, the electric energy consumption of each ton of steel can be reduced by more than 60%, the floor area of the production line can be saved by more than 50%, and the investment of the steel rolling production line with the same production energy can be reduced by more than 60%, so that the steel rolling production line has obvious economic and social benefits.
Example (b): cutting plain carbon steel continuous casting billet by using cutting type cogging
The raw material billet 8 adopts a continuous casting billet with the specification of 150mm multiplied by 3000 mm.
This example uses two sets of billet cutter equipment:
as shown in fig. 4, the first set of billet cutting equipment is an 8-frame four-side feed billet cutting type cogging mill, as shown in fig. 3, the upper and lower tool bits of each billet cutting type cogging mill are active tool bits, the left and right tool bits are passive tool bits, and a guide is arranged at the inlet of each billet cutting type cogging mill to ensure the movement track of the billet. The feed depth of each frame of the first 7 billet cutting type cogging mills is 10mm respectively from top to bottom, from left to right, and the feed depth of the billet cutting type cogging mill of the (8) th frame is 5mm respectively from top to bottom.
The second group of steel billet cutting equipment is a 4-frame four-side feed steel billet cutting type cogging mill, the upper tool bit and the lower tool bit of each steel billet cutting type cogging mill are active tool bits, the left tool bit and the right tool bit are passive tool bits, and a guide is arranged at the inlet of each steel billet cutting type cogging mill to ensure the movement track of steel billets. The feed depth of each frame of the first 3 billet cutting type cogging mills is 10mm respectively from top to bottom, from left to right, and the feed depth of the billet cutting type cogging mill of the (12) th frame is 5mm respectively from top to bottom.
The billet 8 is heated to 1150 degrees celsius.
Further, the hot billet 8 is sent into a first billet cutting type cogging mill, the billet 8 moves along the rolling direction under the driving of the rotation of an upper cutting knife and a lower cutting knife of the billet cutting type cogging mill, and when the tail end of the billet 8 passes through a guide outlet of the (8) th billet cutting type cogging mill, the billet 8 is cut into four billets with the thickness of 70mm multiplied by 3300 mm.
In this example, the cutting speed of the billet cutting type blooming mill was 0.3 m/s.
Further, the four blanks of 70mm multiplied by 3300mm formed by cutting are sequentially and respectively sent into a second group of billet cutting equipment, and when the tail end of each blank passes through a guide and guard outlet of a (12) frame billet cutting type blooming mill, the billet is cut into four blanks of 32mm multiplied by 3450 mm.
A total of 16 blanks of 32mm by 3450mm were obtained by the above cutting.
The blank of 32mm multiplied by 3450mm obtained by the method can meet the requirement of a finishing mill group for producing the deformed steel.
The cutting type cogging method using the billet cutting type cogging mill has the advantages of energy conservation, environmental protection and excellent investment economy, and the large-section billet can be rapidly and efficiently cut into the small-section billet by applying the production mode, so that the steel product is rolled only by using the finishing mill group; because the cutting type cogging mode of the invention does not need to be provided with a roughing mill group and a middle mill group of the traditional steel rolling production line, and the product production can be carried out only by using a finishing mill group, the investment for rolling steel products is greatly reduced, and the production energy consumption is greatly reduced; by applying the steel rolling production line, the electric energy consumption of each ton of steel can be reduced by more than 60%, the floor area of the production line can be saved by more than 50%, and the investment of the steel rolling production line with the same production energy can be reduced by more than 60%, so that the steel rolling production line has obvious economic and social benefits.
It is clear that modifications and/or partial additions may be made to the method and to the apparatus for the cogging of steel billets as described heretofore, without departing from the field and scope of the present invention.
Meanwhile, the above description is only for the purpose of describing specific embodiments of the present invention, and is not intended to limit the scope of the present invention, and all equivalent modifications made by using the contents of the present specification and the drawings, which have the features set forth in the claims, or which are directly or indirectly applied to the related technical field, are included in the scope of the present invention.
Claims (7)
1. A cutting type cogging method using a billet cutting type cogging mill is characterized by comprising the following steps,
step 1: preheating a steel billet to a temperature range between 600 ℃ and 1200 ℃;
step 2: utilizing a billet cutting type cogging mill to longitudinally cut the billet along the rolling direction;
and step 3: when the billet is cut, two cutting modes are provided, the first mode is cutting from four directions of the billet section, and the billet is directly cut into four billet billets with almost equal section areas at one time; the second is to cut the billet into two billet blanks with almost equal cross-sectional areas at one time by feeding from two opposite directions of the blanks;
and 4, step 4: after the billet is cut and cogging for one time, if the section of the billet is still larger than the section requirement required by entering a finishing mill group, cutting and cogging are carried out again, and the process is continuously repeated until the area of the minimum rectangular section after cutting and cogging reaches less than 10mm multiplied by 10 mm;
and 5: and for the condition that the temperature of the blank is too low to meet the requirements of cutting or subsequent steel rolling due to excessive cutting times or small cut section, compensating and heating the blank by using a temperature compensation device until the temperature of the blank reaches the rolling temperature.
2. The cutting-off cogging method of claim 1, wherein in step 3, when cutting off the steel billet, the cutting pass is determined according to the size of the steel billet to be cut, and the cutting depth of each cutting pass is between 1mm and 30 mm.
3. The method of claim 1, wherein the cutting speed of the billet in the step 3 is between 0.05m/s and 2m/s depending on the material and size of the billet.
4. A steel billet cutting type cogging mill is characterized by comprising a motor, a speed reducer connected with the motor, a cutter rotating shaft group connected with an output shaft of the speed reducer through a coupling, and a cutting cutter group arranged on the cutter rotating shaft group, wherein the cutter rotating shaft group is arranged in a frame of the steel billet cutting machine, and the motor is connected with an electrical control system.
5. The steel billet cutting mill as set forth in claim 4, wherein the cutter rotating shafts are upper and lower rotating shafts arranged in parallel, and the cutting cutter sets are upper and lower cutters respectively arranged on the upper and lower rotating shafts.
6. The billet cutting mill of claim 4, wherein the cutter rotating shafts are parallel left and right rotating shafts, and the cutting cutters are left and right cutters respectively disposed on the left and right rotating shafts.
7. The billet cutting mill of claim 4, wherein the cutter rotary shaft assembly comprises upper and lower rotary shafts arranged in parallel, and left and right rotary shafts arranged in parallel, and the cutting cutter assembly comprises upper and lower cutters arranged on the upper and lower rotary shafts, respectively, and left and right cutters arranged on the left and right rotary shafts, respectively.
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| CN202011513261.5A CN112517640A (en) | 2020-12-21 | 2020-12-21 | Cutting type cogging method using billet cutting type cogging mill |
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| CN202011513261.5A CN112517640A (en) | 2020-12-21 | 2020-12-21 | Cutting type cogging method using billet cutting type cogging mill |
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