CN114888089A - Common bar splitting pass rolling method and pass system - Google Patents
Common bar splitting pass rolling method and pass system Download PDFInfo
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- CN114888089A CN114888089A CN202210737065.9A CN202210737065A CN114888089A CN 114888089 A CN114888089 A CN 114888089A CN 202210737065 A CN202210737065 A CN 202210737065A CN 114888089 A CN114888089 A CN 114888089A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000005520 cutting process Methods 0.000 claims description 50
- 230000011218 segmentation Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000002360 preparation method Methods 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 10
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- 238000003825 pressing Methods 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A bar common splitting pass rolling method and a pass system are disclosed, wherein a finishing mill comprises 10 racks, pre-split passes are moved from the original K4 position to the K8 position and are placed on a finishing rolling 3 rd rack; and (4) moving the splitting hole pattern from the original K3 position to the K7 position, and placing the splitting hole pattern on the finish rolling 4 th rack. The rolled pieces are consistent in size after being split by the splitting pass, do not directly enter a front hole of a finished product, but enter the front hole of the finished product after being subjected to extension rolling according to different specifications to be rolled into a proper material shape size, and then enter a finished product hole. A splitting scheme is adopted for each splitting specification, and the splitting schemes from the 1 st to the 5 th finish rolling frames, namely K10 to K6, are shared. The invention has flexible production, can realize specification replacement by using extremely small frame number, greatly saves the time for replacing the specification and the roll, and improves the operating rate of a rolling line; the number of specifications changing is reduced, and the initial rolling difficulty is reduced; and the hole patterns are shared, so that the preparation quantity of the rolling mill is greatly reduced, and the cost of spare parts is reduced.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a bar shared splitting pass rolling method and a pass system.
Background
In the bar slitting rolling process, the slitting schemes of various rolling mills are different, but all the slitting schemes correspond to one set of pass system in one specification, only two times of rolling is carried out after slitting, and when the specifications are changed, all finish rolling mills need to be changed. According to different processes of various steel mills, the steel mills need to be replaced from K1 to K6 when the specification is changed by using single precutting, and the steel mills need to be replaced from K1 to K7 by using double precutting.
Meanwhile, at present, steel mills generally adopt different splitting schemes according to different specifications, for example, at present, a two-splitting process is adopted for the phi 22 and 20 specifications, a three-splitting process is adopted for the phi 18 and 16 specifications, and a four-splitting process is adopted for the phi 14 and 12 specifications.
The phenomenon determines that the number of rollers required to be prepared in the splitting production process is large, the number of frames required to be replaced when specifications are changed is large, and the adjustment difficulty is large. Especially when rolling in small specifications, because the material shape is smaller when cutting, the guide and guard are centered when producing, and the difficulty of adjusting the material shape is very large.
Disclosure of Invention
The invention aims to provide a splitting method for splitting and rolling bars and a splitting pass sharing system thereof, which can realize that one set of splitting passes covers all splitting specifications, thereby reducing the investment of spare parts for splitting specification production preparation, reducing the number of frames required to be replaced for specification replacement, reducing the number of spare parts such as loop channels and the like, saving the time for replacing specifications and rolls, reducing the difficulty in specification replacement adjustment and reducing the possibility of accidents caused by partial biting of small specifications due to small splitting shapes.
The technical scheme of the invention is as follows:
a bar common slit groove rolling method comprises the following steps:
(1) the finishing mill group consists of 10 stand mills, rolled pieces enter the finishing mill group after being cut, and the split widening pass K10 is placed on a first finish rolling frame and adopts a flat roll; placing the cut regular hole type K9 on a finish rolling second frame, and adopting a box type hole; the precut hole splitting type K8 is placed on a finish rolling 3 rd frame; the splitting pass K7 is placed on the finish rolling 4 th frame, and the shapes and the sizes of rolled pieces after the splitting specification is rolled by the pass are completely consistent during splitting;
(2) selecting different extension hole types to roll different shapes and sizes to enter finished product hole types according to the requirements of different specifications on the shapes and the sizes of rolled pieces so as to meet the material shape requirements for producing finished products of different specifications;
(3) and according to different specifications, continuously rolling for two passes, three passes, four passes, five passes and six passes according to different cross section sizes of finished products after the splitting passes to obtain finished products, wherein when the two passes of rolling are carried out, common flat oval or elliptical pass is adopted after the splitting passes, and when the three passes of rolling are carried out, a limited spread pass is adopted to ensure that the head is straight and square to ensure that the multi-pass rolling can be carried out again.
Corresponding to the method, the invention also provides a bar shared splitting hole type system, which is characterized in that:
(1) the widening hole type material shape height H1 is slightly larger than or equal to the pre-splitting hole type material shape height H3, and H1/H3= 1-1.05; the height H2 of the groove bottom of the regular hole is 0.75-0.85 times of the height H1 of the widening hole; the reduction ratio of the structured hole ((D1-D2)/D2) is 15-22%, the structured hole adopts a box hole, and the sidewall inclination alpha =6.5 0 ～7.5 0 The size of the center of the material shape is larger than that of the edge;
(2) the pre-splitting hole type material shape height H3 is slightly less than or equal to the splitting hole type material shape height H4, and H4/H3= 1-1.02; the height m0 between each pair of cutting wedge angles of the pre-cutting split hole type is controlled to be 0.45-0.5 time of the radius of a base circle R0, and the distance of the center line S0 of each small hole in the hole type is controlled to be 2.4-2.5 times of the radius of the base circle;
(3) the radius R0 of the splitting base circle is slightly larger than or equal to the radius R0 of the pre-splitting base circle, R0/R0= 1-1.02, the distance m1 between two opposite hole type wedge angles is controlled to be 0.5-1.5 mm, the wedge angle theta of the splitting hole type is smaller than the pre-splitting wedge angle beta, and the distance S1 of the center line of each small hole between the splitting hole types is consistent with the distance S0 of each small hole of the pre-splitting hole; the total width D4 of the split hole pattern is consistent with the total width D3 of the pre-cut split hole pattern.
In the bar common slit hole type system characteristic (2), when the slit number is more than or equal to 3, the base circle size R1 of small holes on two sides of the precut slit hole type is more than the base circle radius R0, and R1 is 0.2-0.5 mm larger than R0; the pre-cutting wedge-separating angle beta is controlled to be 65 0 The above.
In the bar shared splitting hole type system characteristic (3), when the splitting number is larger than or equal to 3, the radius r1 of the base circle of the small holes at two sides of the splitting hole type is larger than the radius r0 of the base circle, and r1 is 0.2-0.5 mm larger than r 0; the angle theta of the splitting wedge is controlled to be 60 0 The following.
According to the scheme, the situation of the hole type head is optimized through the reasonable size of the hole type before splitting, and multi-pass rolling after splitting is guaranteed, so that one splitting hole type can meet the production requirement of the 6 specifications.
Compared with the traditional splitting method, the splitting hole pattern sharing method has the following advantages: the production is flexible, the specification replacement can be realized by using an extremely small number of frames, the time for replacing the specification and the roll is greatly saved, and the rolling line operation rate is improved; the number of specifications changing is reduced, and the initial rolling difficulty is reduced; the hole patterns are shared, so that the preparation quantity of the rolling mill is greatly reduced, and the cost of spare parts is reduced; the cutting is moved forward, the material type is relatively large during cutting, the adjustment difficulty is reduced, the production is favorably stabilized, and the probability of cutting pass accidents is reduced; pre-splitting and forward shifting of splitting are carried out, and the lengths of all lines tend to be uniform through multi-pass rolling compensation, so that the line difference is reduced.
Drawings
FIG. 1 is a schematic diagram showing the arrangement of the dimensions of the respective holes.
FIG. 2 is a schematic diagram of the arrangement of the sizes of the holes of the example of the four-cut method.
In the figure: H1. widening the hole pattern height; D. widening the shape width of the hole pattern material; h2. regulating the width of the groove bottom of the hole pattern; alpha, regulating the slope of the hole-shaped side wall; D2. regulating the hole pattern height; H3. pre-splitting the hole pattern height; r0. precut hole-dividing aperture base radius; r1, pre-cutting the base radius of the small holes on two sides of the hole dividing shape; s0. precut hole-dividing base circle center distance; m0. pre-cutting the wedge distance; H4. splitting the hole pattern height; r0. dividing the base radius of the hole type small hole; r1, cutting the base circle radius of the small holes at two sides of the hole pattern; s1. precut hole-dividing base circle center distance; m1. pre-cutting the wedge distance; D5. the width of the first extension hole after cutting; H5. the height of the first extending hole after cutting; D5. the width of the upper edge of the first extension hole is H5. after cutting, and the height of the first extension hole is higher after cutting; d5. the width of the lower edge of the first extending hole is wide after cutting; s5. closed hole type roll gap; r6-0\1\2, the radius of the base circle of the second extension hole type after cutting; d7-1\2, cutting the third pass of the oval width of the extension hole pattern; h7-1\2, the height of the third pass of the extension hole type secondary ellipse after cutting; r8-0\2, the radius of the base circle of the fourth extending hole type after cutting; d9-1, cutting the fifth pass of the oval width of the extension hole pattern; h9-1, cutting the fifth pass of the oval height of the extension hole pattern; r10-1, cutting the sixth pass of the extended hole type base circle radius.
Detailed Description
The following further describes the embodiments with reference to the drawings.
As an implementation example, the specifications of hot-rolled ribbed deformed steel phi 12, phi 14, phi 16, phi 18, phi 20 and phi 22 are produced by adopting a four-segmentation common hole pattern, and the finish rolling adopts a 10-frame arrangement form.
1. The overall process design is as follows:
according to the scheme of the invention, the process arrangement of each specification is as follows:
when the phi 12 specification is produced, 4 frames (K10-K7) of hole patterns before finish rolling are shared with all other specifications, the fifth frame of finish rolling is a closed hole pattern, and the 6 th and 7 frames (K5, K4) of hole patterns are shared by the phi 12, phi 16 and phi 18 specifications; the finish rolling of the 8 th and 9 th pass (K3, K2) is a special pass with phi 12 specification; and a finish rolling 10 th rack (K1) is a phi 12 specification finished hole pattern. The size of each hole type meets the requirement of a splitting hole type common system on the size of the hole type.
When the phi 14 specification is produced, 4 frames (K10-K7) of pass before finish rolling are shared with all other specifications, the fifth frame of finish rolling is a closed pass, and the 6 th and 7 th frames (K5, K4) of finish rolling are phi 14 and phi 20 shared passes; the 8 th and 9 th shelves (K3 and K2) are special hole patterns with phi 14 specification; and the finish rolling 10 th rack (K1) is a finished hole pattern with the specification of phi 14. The size of each hole type meets the requirement of a splitting hole type common system on the size of the hole type.
When the phi 16 specification is produced, 4 frames (K10-K7) of pass before finish rolling are shared with all other specifications, the fifth frame of finish rolling is a closed pass, the 6 th and 7 th frames (K5 and K4) of finish rolling are phi 12, phi 16 and phi 18 shared pass, the 8 th frame (K2) of finish rolling is a phi 16 specification special pass, the 9 th frame of finish rolling is a phi 16 specification finished pass, and the 10 th frame of finish rolling is provided with an empty guide groove. The size of each hole type meets the requirement of a splitting hole type common system on the size of the hole type.
When the phi 18 specification is produced, 4 frames (K10-K7) of pass before finish rolling are shared with all other specifications, the fifth frame of finish rolling is a closed pass, the 6 th and 7 th frames (K5 and K4) of finish rolling are phi 12, phi 16 and phi 18 shared pass, and the 8 th frame (K2) of finish rolling is a phi 18 specification finished pass; and (5) mounting empty guide grooves in finish rolling frames 9 and 10. The size of each hole type meets the requirement of a splitting hole type common system on the size of the hole type.
When the phi 20 specification is produced, 4 frames (K10-K7) of pass before finish rolling are shared with all other specifications, the fifth frame of finish rolling is a closed pass, the 6 th and 7 th frames (K5 and K4) of finish rolling are phi 14 and phi 20 shared pass, and the 8 th frame of phi 20 specification finished pass is finish rolling; and (5) mounting empty guide grooves in finish rolling frames 9 and 10. The size of each hole type meets the requirement of a splitting hole type common system on the size of the hole type.
When the phi 22 specification is produced, the hole patterns of 4 frames (K10-K7) before finish rolling are shared with all other specifications, the 5 th frame of finish rolling is a common extension hole pattern, and the 6 th frame (K5) of finish rolling is a finished hole pattern; and (7) finish rolling, mounting the empty guide groove for the second 7, 8, 9 and 10 frames. The size of each hole type meets the requirement of a splitting hole type common system on the size of the hole type.
2. Arrangement of a rolling mill and characteristics of each pass:
arranging a rolling mill: the finishing area is provided with 10 rolling mills, and the arrangement form and the function of each machine frame are as follows:
k10 pass set on finish rolling 1 st frame-horizontal arrangement (widening hole)
K9 pass set on finish rolling 2 nd rack-vertical arrangement (Box type regular)
K8 pass set on finish rolling 3 rd shelf-horizontal arrangement (Pre-split)
K7 pass set on finish rolling 4 th shelf-horizontal arrangement or horizontal and vertical alternation (split)
K6 pass was placed on finish rolling shelf 5-horizontal layout (extension)
K5 pass is placed on finish rolling 6 th shelf-horizontal arrangement or horizontal and vertical alternation (extension/finished product)
The K4 hole pattern is arranged on the finish rolling 7 th frame-horizontal arrangement (extension \ hollow \ finished product)
K3 pass is placed on the 8 th frame of finish rolling-horizontal arrangement or horizontal and vertical alternation (extension \ empty \ finished product)
The K2 hole pattern is arranged on the finish rolling 9 th frame-horizontal arrangement (extension \ empty \ finished product)
The K1 hole pattern is arranged on the 10 th frame of finish rolling-horizontal arrangement (extension \ hollow \ finished product)
The middle rolling adopts a common hole pattern, and the arrangement mode of the rolling mill adopts horizontal and vertical alternation.
The scheme is satisfied that a single steel rolling mill using the deformed steel bar as a main product can adopt one set of splitting hole patterns to realize the comprehensive coverage of products with phi 22 and the following specifications, and one set of four splitting hole patterns can realize the full-specification coverage of the products.
The specific hole patterns are shared as shown in fig. 1, and each hole pattern layout code is shown in table 1.
Table 1 hole pattern configuration table
KE-elliptic or flat elliptic extended hole type
KR-circular extended hole pattern
R-finished hole pattern
BK-closed hole pattern
When the specification is changed, the specification is changed according to the upper caliber configuration.
If the specification phi 12 is changed into the specification phi 22, only the 6 th, 7 th, 8 th, 9 th and 10 th racks (K5, K4, K3, K2 and K1) of finish rolling are changed, wherein the 7 th, 8 th, 9 th and 10 th racks of finish rolling are loaded into the empty guide groove. Because the pre-cutting and cutting rolling mill is not adjusted, the length difference of each cutting line is kept unchanged after the specification is changed, the adjustment difficulty is reduced, the difference of each line does not need to be adjusted, and the adjustment time is saved.
The hole pattern dimensions used for each specification are shown in fig. 2. The method specifically comprises the following steps:
the height of the widening hole pattern, namely the height H1 of the material shape of the widening hole pattern is 29mm, the H3 of the precut split hole pattern is 28mm, and the height of the widening hole pattern is 1.03 times of that of the precut split hole pattern; the height H2 of the groove bottom of the regular hole is 24mm, which is 0.82 times of the height H1 of the widening hole; the reduction ratio of the structured hole ((D1-D2)/D2) is 19%, the structured hole adopts a box-type hole, and the side wall inclination angle alpha =7 0 The material shape has the central size larger than the edge size, and the central part of the regular hole type material shape is ensured to be close to a plane due to reasonable pressing control;
the height of the pre-splitting hole type material shape H3 is 28mm, the height of the splitting hole type material shape is 28.4mm, and H4/H3= 1.014; the height m0 between each pair of cutting wedge angles of the pre-cut split hole type is 6.8mm, which is 0.48 times of the radius of the base circle, and the distance of the central line S0 of each small hole in the hole type is 34mm, which is 2.43 times of the radius of the base circle; the base circle size R1 of the small holes on the two sides is 14mm, the radius of the base circle is 13.8mm, the base circle radius of the small holes on the two sides is 0.2mm larger than that of the middle hole, the pre-cutting wedge angle beta is 73.1 degrees, the whole pre-cutting wedge is relatively blunt, the pressing down ratio is relatively large, and the full shape preparation is made for the cutting hole type.
The radius r0 of the cutting base circle is 14mm, which is slightly larger than the radius of the pre-cutting base circle, and the ratio of the radius of the cutting base circle to the radius of the pre-cutting base circle is 1.014 times. The distance m1 between two relative hole type wedge angles is 1mm, and the cut hole type wedge angle theta is 59.08 0 Is less than 60 0 And is smaller than the angle of the pre-cutting wedge angle, the distance S1 of the central line of each small hole between the cutting hole patterns is 34mm, and is consistent with the distance of the central line of each small hole of the pre-cutting hole patterns; the total width D4 of the split hole type is 140mm, and is consistent with the total width of the pre-cut split hole type. The radius of the base circle of the small holes on the two sides is 14.2mm, the radius of the base circle of the small hole in the middle is 14mm, and the radius of the base circle of the small holes on the two sides is 0.2mm larger than that of the base circle of the small hole in the middle.
The material shapes cut by the hole pattern system are relatively large in size, the precutting and the cutting are same in width, the precutting is divided into small holes of the cutting hole pattern, no metal flows, the occupied area of the cutting strip defect caused by tearing in the cutting process is relatively small, the depth is shallow, the head is flat, no bending is caused, and the like, and the requirements of multi-pass rolling can be met.
Meanwhile, the cut material shape has a healing trend after being repeatedly rolled for multiple times, and the problem that the cut strip is folded after being rolled in the subsequent process in the process of cutting the small-specification round steel can be effectively controlled. Therefore, the method can be used for cutting smooth round steel and high-quality steel bars with non-strict surface quality requirements.
The common splitting pass rolling method has the advantages that:
(1) the finish rolling adopts a 10-frame arrangement scheme, all specifications of the first 5-frame pass are shared, other frames are arranged according to a split shared pass, and phi 12-phi 22 can be completely covered only by 21-sleeve passes, if a traditional process is adopted, all specifications can be produced by the last ten frames only by 42-sleeve passes, 21-sleeve passes can be saved by the scheme, and the occupied number of rollers and rolling mills is greatly saved.
(2) Meanwhile, the common splitting pass rolling method completely adopts a splitting scheme (the preferred option is a 4 splitting scheme), the original 2 splitting, 3 splitting and 5 splitting schemes are abandoned, and after splitting, the loop, the empty guide groove and the channel can meet the production of all specifications only by preparing one set, so that the capital investment of production preparation spare parts is greatly saved.
(3) When the specification is changed, the common hole pattern for splitting is not required to be changed, if the specification phi 18 is changed to the specification phi 16, the specification can be changed by only changing 2 rolling mills in the common splitting program, and other spare parts are not required to be changed. If the traditional cutting process (phi 18 specification 2 cutting, phi 16 specification 3 cutting) is adopted, the rolling needs to be replaced for 6 times, and two groups of split loops need to be replaced by 3 channels of loops from 2 channels of loops; and replacing the finished product rear channel and the take-up device from the channel 2 to the channel 3. The common scheme of the splitting hole type can greatly save specification changing time.
(4) According to the traditional splitting mode, the smaller the specification is, the smaller the material shape entering the pre-splitting and splitting hole pattern is, the higher the adjustment accuracy requirement is, the larger the difficult path is, the larger the line difference can be generated by slightly adjusting the pre-splitting or splitting hole pattern, and by adopting a common hole pattern, the specifications of the pre-splitting and splitting hole pattern are shared, so that the adjustment difficulty of small-specification splitting production is greatly reduced, and the probability of process accidents is reduced.
Claims (4)
1. A bar common slit groove rolling method is characterized by comprising the following steps:
(1) the finishing mill group consists of 10 stand mills, rolled pieces enter the finishing mill group after being cut, and the split widening pass K10 is placed on a first finish rolling frame and adopts a flat roll; placing the cut regular hole type K9 on a finish rolling second frame, and adopting a box type hole; the precut hole splitting type K8 is placed on a finish rolling 3 rd frame; the splitting pass K7 is placed on the finish rolling 4 th frame, and the shapes and the sizes of rolled pieces after the splitting specification is rolled by the pass are completely consistent during splitting;
(2) according to the requirements of different specifications on the shape and the size of a rolled piece, different extension hole types are selected to roll different shapes and sizes and enter a finished hole type so as to meet the material shape requirements for producing finished products of different specifications;
(3) and according to different specifications, continuously rolling for two passes, three passes, four passes, five passes and six passes according to different cross section sizes of the finished product after the splitting passes to obtain the finished product, wherein when the two passes of rolling are carried out, a common flat elliptic or elliptic hole pattern is adopted after the splitting passes, and when the three passes of rolling are carried out, a limited wide spread hole pattern is adopted.
2. The utility model provides a bar sharing segmentation pass system which characterized in that:
(1) the widening hole type material shape height H1 is slightly larger than or equal to the pre-splitting hole type material shape height H3, and H1/H3= 1-1.05; the height H2 of the groove bottom of the regular hole is 0.75-0.85 times of the height H1 of the widening hole; the reduction rate of the regular hole type (D1-D2)/D2 is 15-22 percent; regular hole pattern adopts box pattern hole, and side wall inclination angle alpha =6.5 0 ～7.5 0 The size of the center of the material shape is larger than that of the edge;
(2) the pre-splitting hole type material shape height H3 is slightly less than or equal to the splitting hole type material shape height H4, and H4/H3= 1-1.02; the height m0 between each pair of cutting wedge angles of the pre-cutting split hole type is controlled to be 0.45-0.5 time of the radius of a base circle R0, and the distance of the center line S0 of each small hole in the hole type is controlled to be 2.4-2.5 times of the radius of the base circle;
(3) the radius R0 of the splitting base circle is slightly larger than or equal to the radius R0 of the pre-splitting base circle, R0/R0= 1-1.02, the distance m1 between two opposite hole type wedge angles is controlled to be 0.5-1.5 mm, the wedge angle theta of the splitting hole type is smaller than the pre-splitting wedge angle beta, and the distance S1 of the center line of each small hole between the splitting hole types is consistent with the distance S0 of each small hole of the pre-splitting hole; the total width D4 of the split hole pattern is consistent with the total width D3 of the pre-cut split hole pattern.
3. The common slit hole type system for bars according to claim 2, wherein: in the step (2), when the cutting number is more than or equal to 3, the base circle size R1 of the small holes on the two sides of the precut hole-dividing shape is more than the base circle radius R0, and R1 is 0.2-0.5 mm larger than R0; the precutting wedge-separating angle beta is controlled to be 65 0 The above.
4. The common slit hole type system for bars according to claim 2, wherein: in the step (3), when the cutting fraction is more than or equal to 3, the base radius size r1 of the small holes on the two sides of the cut hole pattern is more than the base radius r0, and r1 is 0.2-0.5 mm larger than r 0; the angle theta of the splitting wedge is controlled to be 60 0 The following.
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| CN217570180U (en) * | 2022-06-27 | 2022-10-14 | 湖南华菱湘潭钢铁有限公司 | Common splitting hole type system for bars |
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