CN109013705B - High-quality steel small-roller-diameter six-roller mill roller system - Google Patents
High-quality steel small-roller-diameter six-roller mill roller system Download PDFInfo
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- CN109013705B CN109013705B CN201811059481.8A CN201811059481A CN109013705B CN 109013705 B CN109013705 B CN 109013705B CN 201811059481 A CN201811059481 A CN 201811059481A CN 109013705 B CN109013705 B CN 109013705B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 12
- 239000010959 steel Substances 0.000 title claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 50
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 238000005452 bending Methods 0.000 claims description 28
- 238000013000 roll bending Methods 0.000 claims description 27
- 230000000712 assembly Effects 0.000 claims description 16
- 238000000429 assembly Methods 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 23
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000007779 soft material Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
A high-quality steel small-roller-diameter six-roller rolling mill roller system comprises an upper supporting roller assembly, an upper middle roller assembly, an upper working roller assembly, a lower middle roller assembly and a lower supporting roller assembly which are sequentially arranged from top to bottom, wherein the upper middle roller assembly and the lower middle roller assembly are used as driving rollers; the rolling force of the rolling mill is far higher than that of other working rolls with the same roller diameter, and the rolling mill is applied to the production of high grade steel, so that hard material thick materials can be produced, thin material soft materials can be produced in a thin mode, the production process is flexible, the rolling capability is strong, and the thickness precision of the product is high.
Description
Technical Field
The invention relates to the technical field of six-roller rolling mill in the cold rolling field, in particular to a high-quality steel small-roller-diameter six-roller rolling mill roller system.
Background
In the production process of the high-grade special steel plate and strip, as the variety of the product materials is large, such as high nickel, low nickel alloy, soft magnetic alloy, spring steel and the like, the product materials not only have high-hardness materials, but also have soft materials; as the thickness variation range of the product is wide, the incoming material is as thick as 5mm, and the thinnest product can produce 0.2mm. The production process is flexible to arrange, and the requirements on the precision of products and the internal performance of materials are high. Because of the need to produce thin gauge hard stock, small diameter work rolls must be used.
The difficulty with such rolling mills is that a large rolling force and moment are required to produce thick gauge stock. The small-diameter working roller cannot transmit large rolling moment due to the fact that the roller diameter is too small, and only a large-diameter middle roller transmission scheme is adopted. The proposal of adopting a large-diameter middle roller to drive a small-diameter working roller directly causes two problems under the action of large rolling force and rolling moment: first, the axial intersection of the work rolls, the intermediate rolls and the backup rolls of the six-high rolling mill causes each roll to receive an axial force, the magnitude of the axial force is usually 3% -5% of the magnitude of the rolling force, the force is borne by the bearings bearing the axial force in the roll system, the size of the bearings bearing the axial force corresponding to the small-diameter work rolls is very small, and the magnitude of the axial force which can be borne is very limited. Therefore, under the action of large rolling force of thick materials, the axial force is correspondingly large, and in addition, the bearing is easy to burn and damage due to the fact that the diameter of the working roll is small and the rotating speed of the bearing is high at the same rolling speed; second, the intermediate rolls transfer rolling moment by means of friction between the rolls, which friction force will generate a horizontal component to the work rolls, and when producing a thick stock with a large rolling moment, the friction force and the horizontal component to the work rolls will be correspondingly very large, whereas the ability of the small diameter work rolls to withstand bending will be substantially reduced compared to the large diameter work rolls. Therefore, when a large horizontal component force acts on the small-diameter work roll, the roll neck of the work roll is extremely easy to break. The traditional horizontal component force adjusting mechanism of the working roller has the advantages of complex structure, high failure rate and large thickness difference of products, and the width of a frame window is increased, so that the longitudinal rigidity of the rolling mill is reduced. Thirdly, rolling the thin material after the rolling mill finishes rolling the thick material in batches, and the thickness precision of the thin material product is lower.
The problems directly caused by the problems are that the belt is broken, the equipment is frequently damaged, and the production cannot be continued, so that the small-diameter six-roller mill can usually only use smaller rolling force to produce thin materials and soft materials; and a large-diameter working roller mill is independently arranged to roll thick materials and hard materials. This configuration is disadvantageous for equipment investment and production costs. In view of the above, it is a primary object of the present invention to overcome the known drawbacks of the prior art.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a high-quality steel small-roller-diameter six-roller rolling mill roller system, wherein the rolling force of the rolling mill is far higher than that of other working rollers with the same roller diameter, and the high-quality steel rolling mill roller system is applied to the production of high-quality steel, can be used for producing hard materials and thick materials and thin materials and soft materials, and has the advantages of flexible production process, strong rolling capability and high product thickness precision.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a high-quality steel small-roller-diameter six-roller rolling mill roller system comprises an upper supporting roller assembly 1, an upper middle roller assembly 2, an upper working roller assembly 3, a lower working roller assembly 4, a lower middle roller assembly 5 and a lower supporting roller assembly 6 which are sequentially arranged from top to bottom, wherein the upper middle roller assembly 3 and the lower middle roller assembly 5 are driving rollers;
a roller bending device 11 for changing an axial crossing angle is arranged between the upper middle roller assembly 2 and the upper working roller assembly 3, and between the lower working roller assembly 4 and the lower middle roller assembly 5;
the two sides of the upper working roll assembly 3 are respectively supported by an operation side axial supporting device 7 and a transmission side axial supporting device 8 by a certain pretightening force.
The roller bending device 11 consists of an upper middle roller bending cylinder block 11-1, a working roller bending cylinder block 11-2, a lower middle roller bending cylinder block 11-4 and a fixed block 11-3, wherein the upper middle roller bending cylinder block 11-1, the working roller bending cylinder block 11-2 and the lower middle roller bending cylinder block 11-4 are all arranged on the fixed block 11-3, and are integrally arranged on the frame 10 through the fixed block 11-3.
The upper working roll assembly 3 comprises tapered roller bearings 3-4, two ends of a bearing outer ring of each tapered roller bearing 3-4 are respectively fixed on a working roll bearing seat 3-6 through a first transparent cover 3-3 and a second transparent cover 3-8, two ends of a bearing inner ring of each tapered roller bearing 3-4 are respectively fixed by a shaft shoulder of each working roll 3-7 and a pressing plate 3-2, and each working roll bearing seat 3-7 is fixed on a working roll bending roll cylinder block 11-2 through a working roll bearing seat locking plate 9;
the outer side of the working roll 3-7 is provided with a needle bearing 3-5, the upper working roll assembly 3 is connected with the jacking device 7 through a plug 3-1, a pressing plate 3-2, and a first sliding plate 3-9 and a second sliding plate 3-10 are arranged between the working roll bearing seat 3-6 and the working roll bending cylinder block 11-2.
The needle roller bearing 3-5 has no inner ring, and the roll neck of the working roll is used as the bearing inner ring.
The thickness of the first sliding plate 3-9 is different from that of the second sliding plate 3-10, the center line of the working roll 3-7 is not coincident with the center line of the upper middle roll assembly 2 and the center line of the rolling mill window, and an offset is provided.
The axial propping device 7 is fixed on a work roll bending cylinder block 11-2, the operation side axial propping device 7 consists of a nitrogen spring 7-1, a cross beam 7-2, an eccentric pin shaft 7-3 and locking jackscrews 7-4, the nitrogen spring 7-1 is fixed on the cross beam 7-2, the structure of the lateral axial propping device 8 is identical to that of the operation side axial propping device 7, and the structure of the lateral axial propping device 8 and the operation side axial propping device 7 are arranged at two ends of the work roll 3-7.
The number of the upper supporting roller assemblies 1 and the lower supporting roller assemblies 6 is two, wherein the bearing clearance of one set of the upper supporting roller assemblies and the lower supporting roller assemblies is larger, and the bearing clearance of the other set of the upper supporting roller assemblies and the lower supporting roller assemblies is smaller.
The invention has the beneficial effects that:
1. under the condition that the diameter of the working roll is fixed, the axial stress condition of the working roll is greatly improved, so that the rolling force of the six-roller mill can be as large as possible.
2. Under the condition that the diameter of the working roll is fixed, the horizontal stress condition of the working roll is greatly improved, so that the rolling moment of the six-roller mill can be as large as possible.
3. Compared with the traditional horizontal component force adjusting mechanism of the working roller, the horizontal component force adjusting mechanism of the invention adjusts the offset through the thickness difference of the sliding plate, has simple and compact structure and high reliability, and simultaneously has narrow width occupied by the roller bending cylinder block and the bearing seat, so that the longitudinal rigidity of the rolling mill is greatly improved, and the thickness precision of the product is high.
4. The rolling mill can cover a very wide product specification, and meets the production characteristics of excellent steel.
Drawings
FIG. 1 is a schematic view of a front view of a rolling mill roll train and a roll bending.
FIG. 2 is a schematic side view of a rolling mill intermediate roll and work roll system.
Fig. 3 is an enlarged view of a portion of the front face of a roll train and a roll bending.
Fig. 4 is a schematic view of the construction of the work roll assembly operation side.
Fig. 5 is a side plan view of a work roll assembly operation.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, a small-roll-diameter six-roller mill is provided, in which a roller system assembly is composed of an upper backup roller assembly 1, an upper intermediate roller assembly 2, an upper work roller assembly 3, a lower work roller assembly 4, a lower intermediate roller assembly 5, and a lower backup roller assembly 6. The upper intermediate roll arrangement 3 and the lower intermediate roll arrangement 5 are driven rolls.
The two methods improve the axial stress condition of the working roll. First, the axial intersection angle of the work rolls and the intermediate rolls is reduced by means of an integral roll bending device. Second, the nitrogen spring applies a preload force that counteracts the axial force acting on the work roll. The method comprises the following steps:
as shown in fig. 1 and 3: the axial crossing angle among the supporting roll, the middle roll and the working roll enables each roll to bear axial force. But the axial forces generated by the crossing angle between the support roller and the intermediate roller are all borne by the thrust bearings in the support roller and intermediate roller assembly, which are able to bear the larger axial forces due to the larger diameters of the support roller and intermediate roller and are not conducted to the work roller. Thus, the axial force acting on the work rolls is only related to the rolling force and the axial crossing angle of the work rolls with the intermediate rolls. The axial force acting on the small diameter work rolls can be reduced by reducing the axial crossing angle of the work rolls with the intermediate rolls.
The traditional six-roller mill working roll bending cylinder block and the middle roll bending cylinder block are respectively arranged on the frame, the middle roll bending cylinder block also needs to axially float relative to the frame, and a plurality of copper sliding plates are needed between the cylinder block and the frame. And each middle roll bending cylinder block and each working roll bending cylinder block are provided with lining plates. Due to the accumulated tolerance of the processing and mounting links of each roll bending cylinder block, the copper sliding plate and the lining plate, the axial intersection of the working roll and the middle roll shaft is serious. The invention adopts the design of an integral roller bending device, and the roller bending device 11 consists of an upper middle roller bending cylinder block 11-1, a working roller bending cylinder block 11-2, a lower middle roller bending cylinder block 11-4 and a fixed block 11-3. The device is characterized in that an upper middle roll bending cylinder block 11-1, a working roll bending cylinder block 11-2 and a lower middle roll bending cylinder block 11-4 are all arranged on a fixed block 11-3. The upper middle roller bending cylinder block 11-1, the working roller bending cylinder block 11-2 and the lower middle roller bending cylinder block 11-4 are respectively provided with a copper-free sliding plate and a lining plate-free design, and the roller bending device can be integrally arranged on the frame 10 through the fixing block 11-3 as a whole. Therefore, each roll bending cylinder block can be used as a part for processing, checking and assembling, so that the form and position tolerance between the surfaces matched with the bearing seat sliding plates in the integral roll bending device can be controlled within 0.01mm, and then the integral roll bending device is only required to be assembled 11 on the frame 10, the assembly precision is greatly improved, and the axial crossing angle of the working roll and the middle roll is very small, so that the axial force acting on the working roll is also greatly reduced under the condition that the rolling force is unchanged.
As shown in fig. 4: the two sides of the upper working roll assembly 3 are respectively supported by an operation side axial supporting device 7 and a transmission side axial supporting device 8 by a certain pretightening force. All structures on the left side and the right side of the upper working roll assembly 3 are symmetrical by taking the central line of the rolling mill as a symmetrical line: one side of the device consists of a top 3-1, a pressing plate 3-2, a first transparent cover 3-3, a tapered roller bearing 3-4, a needle roller bearing 3-5, a working roller bearing seat 3-6, a working roller 3-7, a second transparent cover 3-8, a first sliding plate 3-9 and a second sliding plate 3-10; the other side is also provided with corresponding structures such as a top, a pressing plate, a transparent cover, a tapered roller bearing, a needle bearing, a working roller bearing seat, a sliding plate and the like, and is symmetrical with the structures. And two ends of the bearing outer ring of the tapered roller bearing 3-4 are respectively fixed on the working roller bearing seat 3-6 by a first transparent cover 3-3 and a second transparent cover 3-8. Two ends of the bearing inner ring of the tapered roller bearing 3-4 are respectively fixed by the shaft shoulder of the working roller 3-7 and the pressing plate 3-2. The work roll chock 3-7 is secured to the work roll bending block 11-2 by a work roll chock lock plate 9.
As shown in fig. 2 and 5: the axial propping device 7 is fixed on the work roll bending cylinder block 11-2. The operation side axial jacking device 7 consists of a nitrogen spring 7-1, a cross beam 7-2, an eccentric pin shaft 7-3 and a locking jackscrew 7-4. The nitrogen spring 7-1 is fixed on the cross beam 7-2. When the eccentric pin shaft 7-3 rotates, the cross beam can deviate within the range of the eccentric adjustment amount, so that the central line of the nitrogen spring 7-1 is always aligned with the working roller shaft line and is propped against the working roller shaft line. The structure of the lateral axial propping device 8 is the same as that of the operation lateral axial propping device 7. So that a nitrogen spring is arranged at the left and right sides and is propped against the two ends of the working roller 3-7.
The operation side axial propping device 7 and the transmission side axial propping device 8 are adopted to prop against the two sides of the upper working roller assembly, so that a part of axial force acting on the working roller can be counteracted: because the axial clearance exists between the inner ring and the outer ring of the double-row tapered roller bearing, the lock plate of the working roller bearing seat and the working roller bearing seat have clearance in the axial direction of the working roller, when the working roller is subjected to axial force, the two sides of the operation side axial propping device 7 and the transmission side axial propping device 8 are propped against the working roller, and therefore the axial force acts on the nitrogen spring of the axial propping device at first. The pretightening force of the nitrogen spring against the working roller can be set by adjusting the nitrogen pressure. Along with the increase of the axial force, after the pretightening force is reached, the axial force is increased again, so that the nitrogen spring is compressed and retreated, and after the compression amount exceeds the sum of the axial clearance of the bearing and the clearance of the locking plate, the axial force acts on the double-row tapered roller bearing and is finally transmitted to the frame. The structure of the invention counteracts a part of axial force acting on the working roller by the pretightening force of the nitrogen spring, so that the axial force required to be born by the double-row tapered roller bearing is greatly reduced, and the service life of the bearing is prolonged.
Two methods improve the horizontal stress condition of the working roller: first, the center line of the working roll has an offset relative to the center line of the upper intermediate roll, so that the horizontal component of the rolling force can be offset with the horizontal component generated by the rolling moment transmission to a certain extent under the action of the rolling force. Secondly, the diameter of the roll neck of the working roll is increased by adopting a bearing without an inner ring. The method comprises the following steps:
all structures on the left side and the right side of the working roll assembly 3 are symmetrical by taking the central line of the rolling mill as a symmetrical line. The thicknesses of the first sliding plate 3-9 and the second sliding plate 3-10 are different, so that the center line of the working roll 3-7 is not overlapped with the center line of the upper middle roll assembly 2, and the center line of the working roll 3-7 is not overlapped with the center line of the upper middle roll assembly 2 and the center line of the rolling mill window, and has an offset. The different thickness differences between the first 3-9 and second 3-10 skids will produce different amounts of offset. And after the working roll assembly 3 rotates 180 degrees on the horizontal plane, the offset direction of the central line of the working roll 3-7 relative to the central line of the upper middle roll assembly 2 is opposite to the original one, and the offset amount is unchanged from the original one.
In order to further improve the horizontal force which can be borne by the small-diameter working roller, the invention adopts a radial bearing without an inner ring, and the roller neck of the working roller is used as the inner ring of the bearing. The needle roller bearing 3-5 is selected as the radial bearing without the inner ring, the rolling body of the bearing is very small in size, and the diameter of the roll neck of the working roll can be increased to the greatest extent by the method without the inner ring. The work roll bending resistance is proportional to the diameter third power. The roll neck of the working roll is heat treated to make the core soft and tough and the surface hardened. The rolling bearing can meet the rolling requirement of the bearing rolling body on the upper surface, and can increase the bending resistance and the impact resistance of the roll neck.
In particular, in order to apply a pretensioning force to the work rolls in the range of the eccentric adjustment amounts of the different work rolls and the intermediate rolls, the axial tensioning device is provided with an eccentric pin 7-3, which rotates so that the cross beam can be deflected, and the center line of the nitrogen spring always aligns with the work roll axis and is abutted against the same.
The number of the upper supporting roller assemblies 1 and the lower supporting roller assemblies 6 is two, wherein the bearing play of one set of the upper supporting roller assemblies and the lower supporting roller assemblies is larger, and the precision is relatively low; the bearing clearance of the assembly of the upper supporting roller and the lower supporting roller is smaller, and the precision is relatively higher. The supporting roller with larger bearing play is assembled with the rolled thick material, so that the bearing can bear large load and large heating value; the supporting roller with smaller bearing clearance is used for assembling rolled thin materials, and the product precision is high; if thin materials are produced again after the thick materials are produced in large quantity, the supporting roller needs to be replaced; and if thick materials are continuously produced after the thin materials are produced, the supporting roller does not need to be replaced.
Claims (1)
1. The high-quality steel small-roller-diameter six-roller rolling mill roller system is characterized by comprising an upper supporting roller assembly (1), an upper middle roller assembly (2), an upper working roller assembly (3), a lower working roller assembly (4), a lower middle roller assembly (5) and a lower supporting roller assembly (6) which are sequentially arranged from top to bottom, wherein the upper middle roller assembly (2) and the lower middle roller assembly (5) are driving rollers;
a roller bending device (11) for reducing the axial crossing angle between the working roller and the middle roller is arranged between the upper middle roller assembly (2) and the upper working roller assembly (3) and between the lower working roller assembly (4) and the lower middle roller assembly (5);
two sides of the upper working roll assembly (3) are respectively propped by an operation side axial propping device (7) and a transmission side axial propping device (8) by a certain pretightening force;
the roller bending device (11) consists of an upper middle roller bending cylinder block (11-1), a working roller bending cylinder block (11-2), a lower middle roller bending cylinder block (11-4) and a fixed block (11-3), wherein the upper middle roller bending cylinder block (11-1), the working roller bending cylinder block (11-2) and the lower middle roller bending cylinder block (11-4) are all arranged on the fixed block (11-3), the upper middle roll bending cylinder block 11-1, the working roll bending cylinder block 11-2, the lower middle roll bending cylinder block 11-4 and other cylinder blocks are integrally arranged on the frame (10) through the fixed block (11-3) and are designed by adopting copper-free sliding plates and lining plates;
the upper working roll assembly (3) comprises a tapered roller bearing (3-4), two ends of a bearing outer ring of the tapered roller bearing (3-4) are respectively fixed on a working roll bearing seat (3-6) by a first transparent cover (3-3) and a second transparent cover (3-8), two ends of a bearing inner ring of the tapered roller bearing (3-4) are respectively fixed by a shaft shoulder and a pressing plate (3-2) of a working roll (3-7), and the working roll bearing seat (3-6) is fixed on a working roll bending cylinder block (11-2) by a working roll bearing seat locking plate (9);
the outer side of the working roll (3-7) is provided with a needle bearing (3-5), the upper working roll assembly (3) is connected with an operation side axial jacking device (7) through a plug (3-1), a pressing plate (3-2), and a sliding plate I (3-9) and a sliding plate II (3-10) are arranged between the working roll bearing seat (3-6) and a working roll bending cylinder block (11-2);
the needle roller bearing (3-5) has no inner ring, and the roll neck of the working roll is used as the inner ring of the bearing;
the thickness of the first sliding plate (3-9) is different from that of the second sliding plate (3-10), the center line of the working roller (3-7) is not overlapped with the center line of the upper middle roller assembly (2) and the center line of the rolling mill window, and an offset is provided;
the device is characterized in that the operation side axial propping device (7) is fixed on a work roll bending cylinder block (11-2), the operation side axial propping device (7) consists of a nitrogen spring (7-1), a cross beam (7-2), an eccentric pin shaft (7-3) and a locking jackscrew (7-4), the nitrogen spring (7-1) is fixed on the cross beam (7-2), the structure of the transmission side axial propping device (8) is the same as that of the operation side axial propping device (7), and the structure of the transmission side axial propping device (8) and the structure of the operation side axial propping device (7) are arranged at two ends of the work roll (3-7);
the number of the upper supporting roller assemblies (1) and the lower supporting roller assemblies (6) is two, wherein the bearing clearance of one set of the upper supporting roller assemblies and the lower supporting roller assemblies is larger, and the bearing clearance of the other set of the upper supporting roller assemblies and the lower supporting roller assemblies is smaller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811059481.8A CN109013705B (en) | 2018-09-12 | 2018-09-12 | High-quality steel small-roller-diameter six-roller mill roller system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811059481.8A CN109013705B (en) | 2018-09-12 | 2018-09-12 | High-quality steel small-roller-diameter six-roller mill roller system |
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| CN109013705A CN109013705A (en) | 2018-12-18 |
| CN109013705B true CN109013705B (en) | 2024-04-16 |
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| CN112743888A (en) * | 2020-11-24 | 2021-05-04 | 四川恒恩新材料科技有限公司 | Preparation method of mesh steel-plastic pipeline |
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| CN109013705A (en) | 2018-12-18 |
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