CN103447300A - Centralized transmission reducer and reducing process of hot-rolled seamless steel tubes by using reducer - Google Patents
Centralized transmission reducer and reducing process of hot-rolled seamless steel tubes by using reducer Download PDFInfo
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- CN103447300A CN103447300A CN2013103893973A CN201310389397A CN103447300A CN 103447300 A CN103447300 A CN 103447300A CN 2013103893973 A CN2013103893973 A CN 2013103893973A CN 201310389397 A CN201310389397 A CN 201310389397A CN 103447300 A CN103447300 A CN 103447300A
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Abstract
The invention provides a centralized transmission reducer for rolling hot-rolled seamless steel tubes and a reducing process of hot-rolled seamless steel tubes by using the reducer. The reducing process comprises the following steps of: determining the ratio of the rotating speed of a superimposed motor to the rotating speed of a main motor by utilizing the ratio of the outer diameter to the wall thickness of the hot-rolled seamless steel tube; adjusting the rotating speeds of the superimposed motor and the main motor according to the ratio of the rotating speeds; utilizing the torque rotatably output by the main motor and the superimposed motor at respective rotating speeds, so that a gear set inputs sequentially increasing rotating speeds to multiple passes; and utilizing multiple passes to reduce the diameter of the hot-rolled seamless steel tube, wherein the ratio of the rotating speed of the superimposed motor to the rotating speed of the main motor decreases with the increase of the ratio of the outer diameter to the wall thickness of the hot-rolled seamless steel tube. By applying the centralized transmission reducer provided by the invention in the production process of the steel tubes, the wall thickness uniformity of the steel tube is improved.
Description
Technical field
The present invention relates to the hot rolled seamless steel tube rolling technical field, particularly a kind of reducing mill of the central driving for the hot rolled seamless steel tube rolling and the reducing mill tube reducing method to hot rolled seamless steel tube.
Background technology
At present, the technological process of hot rolled seamless steel tube roughly comprises: heating of pipe blank-perforation (being rolled into hollow hollow billet)-tube rolling (tube reducing, subtract wall and basic determine wall thickness)-tube reducing (tube reducing, determine external diameter, may produce certain influence to wall thickness)---cooling.
The capital equipment of tube reducing operation is reducing mill, and it mainly comprises support and the pass of standing part, and wherein, support comprises motor, power transmission shaft, gear, output gear cover etc.; Pass is arranged by series according to specification, after pushing along slideway, by power shaft, with the tooth cover, is connected.
The kind of drive of reducing mill generally is divided into central driving and transmission separately, central driving is that a main motor and a superimposed motor produce one group of speed increased progressively by one group of gear and pass to respectively a plurality of passes that are arranged in order, and transmission is that multiple electric motors drives respectively a plurality of passes that are arranged in order separately.And the number of pass generally is designed to 10～24 (being generally that a plurality of passes are located on reducing mill, so the application is called again central driving multi-frame reducing mill).
The rotating speed stack of the type reducing mill when corresponding transmission system all adopts fixed structure in use, during actual production, there is more serious difference along its length in the thickness of steel pipe of many specifications, maximum can reach 1.5mm, and be difficult for being detected, manifest until the user uses, cause and be difficult to the loss of saving.
As from the foregoing, in the production process of hot rolled seamless steel tube, reducing mill is that finally to be out of shape together operation and Main Function be to determine external diameter.But the intrinsic deformation characteristics of reducing mill determines that it is subtracted, can produce impact to a certain degree to wall thickness when sizing steel pipe.How thickness of steel pipe, changing value alongst is controlled in minimum zone, improves steel pipe uniformity dimensionally, thereby guarantees the performance of steel pipe each side, and improving " vertically wall unevenness " defect is to need at present the pressing issues that solve.
Summary of the invention
The object of the present invention is to provide a kind of reducing mill of the central driving for the hot rolled seamless steel tube rolling, the hot rolled seamless steel tube existed with the solution prior art is along the larger problem of its length direction wall thickness change scope.
In order to address the above problem, the invention provides a kind of reducing mill of the central driving for the hot rolled seamless steel tube rolling, it comprises: a main motor and a superimposed motor, all for exporting torque; With described superimposed motor, be connected, the rotating speed that the rotating speed of described superimposed motor is changed to adjust described superimposed motor for the ratio of the external diameter according to hot rolled seamless steel tube and wall thickness compares adjusting device with the rotating speed stack of the ratio of the rotating speed of described main motor; Support; Gear train, be located in described support, and be connected with described superimposed motor and be connected with described main motor by a primary input axle by a stack power shaft; A plurality of passes, for to the hot rolled seamless steel tube tube reducing, be arranged in order the side in described support along hot rolled seamless steel tube rolling direction, and be connected respectively the rotating speed increased progressively successively with input with described gear train with a power transmission shaft by an output gear cover; Wherein, the rotating speed of described superimposed motor is along with the increase of the external diameter of hot rolled seamless steel tube and wall thickness ratio and dwindle.
Preferably, the stack of described rotating speed comprises 5 gear speed adjustment units than adjusting device, and any gear speed adjustment unit and the external diameter of hot rolled seamless steel tube and the ratio of wall thickness and the corresponding relation of rotating speed stack ratio are:
| The gear unit number | D/S | Rotating speed stack ratio |
| 1 | D/S﹤3.6 | 70% |
| 2 | 3.6≤D/S﹤4 | 60% |
| 3 | 4≤D/S﹤5 | 50% |
| 4 | 5≤D/S﹤6 | 40% |
| 5 | D/S>6 | 35% |
Wherein, the external diameter that D/S is hot rolled seamless steel tube and the ratio of wall thickness, the external diameter that D is hot rolled seamless steel tube, the wall thickness that S is hot rolled seamless steel tube, described superimposed motor rotating speed is called rotating speed stack ratio with the ratio of described main motor speed.
In order to address the above problem, the invention provides the another kind of central driving reducing mill for the hot rolled seamless steel tube rolling, this central driving reducing mill comprises: a main motor and a superimposed motor, all for exporting torque; With described main motor, be connected, the rotating speed that is changed to adjust described superimposed motor for the rotating speed to described main motor compares adjusting device with the rotating speed stack of the ratio of the rotating speed of described main motor; Support; Gear train, be located in described support, and be connected with described superimposed motor and be connected with described main motor by a primary input axle by a stack power shaft; A plurality of passes, for to the hot rolled seamless steel tube tube reducing, be arranged in order the side in described support along hot rolled seamless steel tube rolling direction, and be connected respectively the rotating speed increased progressively successively with input with described gear train with a power transmission shaft by an output gear cover; Wherein, the rotating speed of main motor is along with the increase of the external diameter of hot rolled seamless steel tube and wall thickness ratio and increase.
Preferably, the stack of described rotating speed comprises 5 gear speed adjustment units than adjusting device, and any gear speed adjustment unit and the external diameter of hot rolled seamless steel tube and the ratio of wall thickness and the corresponding relation of rotating speed stack ratio are:
| The gear unit number | D/S | Rotating speed stack ratio |
| 1 | D/S﹤3.6 | 70% |
| 2 | 3.6≤D/S﹤4 | 60% |
| 3 | 4≤D/S﹤5 | 50% |
| 4 | 5≤D/S﹤6 | 40% |
| 5 | D/S>6 | 35% |
Wherein, the external diameter that D/S is hot rolled seamless steel tube and the ratio of wall thickness, the external diameter that D is hot rolled seamless steel tube, the wall thickness that S is hot rolled seamless steel tube, described superimposed motor rotating speed is called rotating speed stack ratio with the ratio of described main motor speed.
In order to address the above problem, the present invention also provides the reducing process of a kind of reducing mill to hot rolled seamless steel tube, and this reducing mill comprises: a main motor and a superimposed motor, all for exporting torque; Support; Gear train, be located in described support, and be connected with described superimposed motor and be connected with described main motor by a primary input axle by a stack power shaft; A plurality of passes, for to the hot rolled seamless steel tube tube reducing, be arranged in order the side in described support, and be connected respectively the rotating speed increased progressively successively with input with described gear train with a power transmission shaft by an output gear cover; Described reducing process comprises:
Utilize the ratio of the external diameter of hot rolled seamless steel tube and wall thickness to determine the ratio of the rotating speed of the rotating speed of described superimposed motor and described main motor;
Adjust described superimposed motor rotating speed and described main motor speed according to the ratio of rotating speed;
The rotating speed that the torque that the torque that utilizes described main motor to transfer out at described main motor speed backspin and described superimposed motor transfer out at described superimposed motor rotating speed backspin will increase progressively described gear train successively inputs to a plurality of passes;
Utilize a plurality of described passes to the hot rolled seamless steel tube tube reducing;
Wherein, the rotating speed ratio of the rotating speed of described superimposed motor and described main motor is along with the increase of the external diameter of hot rolled seamless steel tube and wall thickness ratio and dwindle.
Preferably, the external diameter of hot rolled seamless steel tube and wall thickness ratio are called D/S, and described superimposed motor rotating speed is called rotating speed stack ratio with the ratio of described main motor speed, and described D/S with the corresponding relation of rotating speed stack ratio is:
| D/S | Rotating speed stack ratio |
| D/S﹤3.6 | 70% |
| 3.6≤D/S﹤4 | 60% |
| 4≤D/S﹤5 | 50% |
| 5≤D/S﹤6 | 40% |
| D/S>6 | 35% |
Wherein, the external diameter that D is hot rolled seamless steel tube, the wall thickness that S is hot rolled seamless steel tube.
The present invention is based on the research to variation tendency between rotating speed stack ratio and D/S, can be controlled at along its length in 0.4mm by all gauge steel thicknesss of pipe wall, compared with prior art, the wall thickness variation defect improvement amplitude of hot rolled seamless steel tube reaches 70%, has improved product quality.
The accompanying drawing explanation
The schematic top plan view of a kind of reducing mill of the central driving for the hot rolled seamless steel tube rolling that Fig. 1 provides for the embodiment of the present invention one;
Fig. 2 is the support master TV structure schematic diagram in Fig. 1;
Fig. 3 is support in Fig. 1 and the schematic side view of pass;
The another kind that Fig. 4 provides for the embodiment of the present invention one is for the schematic top plan view of the central driving reducing mill of hot rolled seamless steel tube rolling;
The schematic flow sheet of a kind of reducing mill that Fig. 5 provides for the embodiment of the present invention two to the reducing process of hot rolled seamless steel tube.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
Embodiment mono-
Fig. 1-Fig. 3 schematically shows the structure of a kind of reducing mill of the central driving for the hot rolled seamless steel tube rolling that the embodiment of the present invention provides, as shown in the figure, the present embodiment mainly comprises that main motor 11, superimposed motor 12, rotating speed stack are than adjusting device 32, primary input axle 21, stack power shaft 22, support 3, gear train 4, output gear cover 5, power transmission shaft 6 and pass 7.
Wherein, main motor 11, superimposed motor 12 all are respectively one for exporting torque and quantity, and superimposed motor 12 rotating speeds are referred to as rotating speed stack ratio with the ratio of main motor 11 rotating speeds.The rotating speed stack is connected in superimposed motor 12 than adjusting device 32, for according to D/S, the rotating speed of superimposed motor being changed to adjust rotating speed stack ratio, gear train 4 is located in support 3, and is connected with superimposed motor 12 and is connected with main motor 11 by primary input axle 21 by stack power shaft 22.A plurality of passes 7 are for to the hot rolled seamless steel tube tube reducing, be arranged in order a side in support 3 from the mouth of nipping to stinging outlet along hot rolled seamless steel tube rolling direction, and be connected respectively the rotating speed increased progressively successively with input with gear train 4 with a power transmission shaft 6 by an output gear cover 5.Wherein, the external diameter that D/S is hot rolled seamless steel tube and the ratio of wall thickness, the external diameter that D is hot rolled seamless steel tube, the wall thickness that S is hot rolled seamless steel tube, the rotating speed of superimposed motor dwindles to meet the rotating speed stack than dwindling along with the increase of D/S along with the increase of the external diameter of hot rolled seamless steel tube 9 and wall thickness ratio.
Preferably, the rotating speed stack comprises 5 gear speed adjustment units than adjusting device, and any gear speed adjustment unit with the corresponding relation of D/S and rotating speed stack ratio is:
| The gear unit number | D/S | Rotating speed stack ratio |
| 1 | D/S﹤3.6 | 70% |
| 2 | 3.6≤D/S﹤4 | 60% |
| 3 | 4≤D/S﹤5 | 50% |
| 4 | 5≤D/S﹤6 | 40% |
| 5 | D/S>6 | 35% |
As shown in Figure 4, the embodiment of the present invention provides the another kind of central driving reducing mill for the hot rolled seamless steel tube rolling, wherein, main motor 11, superimposed motor 12, primary input axle 21, stack power shaft 22, support 3, gear train 4, output gear cover 5, power transmission shaft 6 and pass 7 are identical with above-mentioned embodiment, different is, and the stack of present embodiment medium speed connects and main motors than adjusting device 31, and wherein the rotating speed of main motor increases to meet the rotating speed stack than dwindling along with the increase of D/S along with the increase of the external diameter of hot rolled seamless steel tube 9 and wall thickness ratio.
It should be noted that superimposed motor is direct current generator, the rotating speed be connected with superimposed motor stack is preferably the resistor adjusting device than adjusting device 32; Main motor can be that direct current generator can also be alternating current generator, and the rotating speed stack be connected with main motor is preferably power supply frequency conversion adjusting device than adjusting device 31, changes the frequency of main motor power supply to change the rotating speed of main motor.
Because the gearratio of each root output gear cover 5 of gear train 4 correspondences is constant, when rotating speed stack when changing, the corresponding variation also will occur in the amplitude that between power transmission shaft 6, rotating speed increases progressively, synchronously have influence on the variation of metal flow second flow in pass 7, and cause wall thickness variation in various degree.
By collecting, analyze the data corresponding relation between rotating speed stack ratio and the variation of different size thickness of steel pipe, can establish the more accurate rotating speed corresponding with a D/S value stack ratio, thus can be by the wall thickness of the hot rolled seamless steel tube of all specifications 9 variation along its length be controlled in 0.4mm.
By being set, the rotating speed stack compares adjusting device, make this reducing mill from the different ratios of wall thickness, the rotating speed of suitable superimposed motor and the rotating speed ratio of main motor are set according to the external diameter of hot rolled seamless steel tube, thereby variation by the wall thickness of the hot rolled seamless steel tube of all specifications along its length is controlled in 0.4mm, and then has improved product quality.
Embodiment bis-
Fig. 5 schematically shows reducing mill that the embodiment of the present invention two the provides tube reducing method to hot rolled seamless steel tube, this reducing mill is not have the rotating speed stack to compare adjusting device with the reducing mill difference part in above-described embodiment one, main motor is not connected than adjusting device with the rotating speed stack, superimposed motor is not connected than adjusting device with the rotating speed stack yet, and the main motor 11 that this reducing mill comprises, superimposed motor 12, primary input axle 21, stack power shaft 22, support 3, gear train 4, output gear cover 5, power transmission shaft 6 and pass 7 are identical with above-described embodiment one.That is: main motor 11, superimposed motor 12 all are respectively one for exporting torque and quantity, and superimposed motor 12 rotating speeds are referred to as rotating speed stack ratio with the ratio of main motor 11 rotating speeds.Gear train 4 is located in support 3, and is connected with superimposed motor 12 and is connected with main motor 11 by primary input axle 21 by stack power shaft 22.A plurality of passes 7 are for to hot rolled seamless steel tube 7 tube reducings, be arranged in order a side in support 3 from the mouth of nipping to stinging outlet along hot rolled seamless steel tube rolling direction, and be connected respectively the rotating speed increased progressively successively with input with gear train 4 with a power transmission shaft 6 by an output gear cover 5.In other words the quantity of the quantity of the quantity of pass 7 and output gear cover 5 and power transmission shaft 6 is identical.
Adopt above-mentioned reducing mill to comprise the tube reducing method of hot rolled seamless steel tube:
The ratio of step 110, the external diameter that utilizes hot rolled seamless steel tube and wall thickness is determined the ratio of the rotating speed of the rotating speed of superimposed motor and main motor;
In practice, the external diameter of hot rolled seamless steel tube and the ratio of wall thickness are larger, and the ratio of the rotating speed of the rotating speed of superimposed motor and main motor is less.
The external diameter of hot rolled seamless steel tube and wall thickness ratio are called D/S, and the superimposed motor rotating speed is called rotating speed stack ratio with the ratio of main motor speed, and preferably, D/S with the corresponding relation of rotating speed stack ratio is
| D/S | Rotating speed stack ratio |
| D/S﹤3.6 | 70% |
| 3.6≤D/S﹤4 | 60% |
| 4≤D/S﹤5 | 50% |
| 5≤D/S﹤6 | 40% |
| D/S>6 | 35% |
Step 120, according to the ratio of rotating speed, adjust superimposed motor rotating speed and main motor speed;
In practice, can fix the rotating speed of main motor, adjust the rotating speed of superimposed motor to meet the ratio of rotating speed, the rotating speed of all right fixed overlay motor, adjust the rotating speed of main motor to meet the ratio of rotating speed, can adjust the rotating speed of the rotating speed of main motor and superimposed motor to meet the ratio of rotating speed, the present embodiment is not limited this simultaneously yet, and the ratio of rotating speed is the ratio of the rotating speed of the rotating speed of superimposed motor and main motor namely.
The rotating speed that the torque that step 130, the torque that utilizes main motor to transfer out at main motor speed backspin and superimposed motor transfer out at superimposed motor rotating speed backspin will increase progressively gear train successively inputs to a plurality of passes;
Step 140, utilize a plurality of passes to the hot rolled seamless steel tube tube reducing, wherein, the rotating speed stack is dwindled than the increase of the external diameter along with hot rolled seamless steel tube and wall thickness ratio.
Rotating speed stack is than the ratio of the rotating speed of the rotating speed of superimposed motor namely and main motor.
Determine the ratio of the rotating speed of the rotating speed of superimposed motor and main motor by the external diameter according to hot rolled seamless steel tube and the different ratios of wall thickness, adjust the rotating speed of superimposed motor and the rotating speed of main motor according to the ratio of this rotating speed again, thereby variation by the wall thickness of the hot rolled seamless steel tube of all specifications along its length is controlled in 0.4mm, and then has improved product quality.
The hot rolled seamless steel tube that the specification of below take is ∮ 95*10mm is effect of the present invention as example illustrates.
For the size hot-rolled seamless steel pipe of ∮ 95*10mm, set the rotating speed stack than for all specifications of 60%(, all adopting this value according to prior art) time, two cross section wall thickness of difference maximum are respectively (10.8,10.5,10.3,9.7) and (9.7,9.5,9.05,8.7).According to the present embodiment, ratio 95/10=9.5 due to external diameter and wall thickness > 6, select the rotating speed stack corresponding with this specification than 35%, by rotating speed is superposeed than being adjusted into 35%, two cross section wall thickness of difference maximum be respectively (10.8,10.5,10.3,9.7) and (10.7,10.2,10.1,9.5) (four points of above-mentioned first bracket are corresponding one by one with four points of second bracket, such as in the bracket of front first the point and the back bracket in first point be positioned on the straight line of same and axially parallel).
To sum up, the wall thickness variation along its length of the hot rolled seamless steel tube that the present invention produces can be controlled in 0.4mm, and the improvement amplitude reaches 70%, and greatly degree improves product quality.
As known by the technical knowledge, the present invention can realize by other the embodiment that does not break away from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment, with regard to each side, all just illustrate, and is not only.Change within the scope of the present invention all or within being equal to scope of the present invention all is included in the invention.
Claims (6)
1. the reducing mill of the central driving for the hot rolled seamless steel tube rolling, is characterized in that, comprising:
One main motor and a superimposed motor, all for exporting torque;
With described superimposed motor, be connected, the rotating speed that the rotating speed of described superimposed motor is changed to adjust described superimposed motor for the ratio of the external diameter according to hot rolled seamless steel tube and wall thickness compares adjusting device with the rotating speed stack of the ratio of the rotating speed of described main motor;
Support;
Gear train, be located in described support, and be connected with described superimposed motor and be connected with described main motor by a primary input axle by a stack power shaft;
A plurality of passes, for to the hot rolled seamless steel tube tube reducing, be arranged in order the side in described support along hot rolled seamless steel tube rolling direction, and be connected respectively the rotating speed increased progressively successively with input with described gear train with a power transmission shaft by an output gear cover;
Wherein, the rotating speed of described superimposed motor is along with the increase of the external diameter of hot rolled seamless steel tube and wall thickness ratio and dwindle.
2. central driving reducing mill according to claim 1, is characterized in that,
The stack of described rotating speed comprises 5 gear speed adjustment units than adjusting device, and any gear speed adjustment unit and the external diameter of hot rolled seamless steel tube and the ratio of wall thickness and the corresponding relation of rotating speed stack ratio are:
Wherein, the external diameter that D/S is hot rolled seamless steel tube and the ratio of wall thickness, the external diameter that D is hot rolled seamless steel tube, the wall thickness that S is hot rolled seamless steel tube, described superimposed motor rotating speed is called rotating speed stack ratio with the ratio of described main motor speed.
3. the reducing mill of the central driving for the hot rolled seamless steel tube rolling, is characterized in that, comprising:
One main motor and a superimposed motor, all for exporting torque;
With described main motor, be connected, the rotating speed that is changed to adjust described superimposed motor for the rotating speed to described main motor compares adjusting device with the rotating speed stack of the ratio of the rotating speed of described main motor;
Support;
Gear train, be located in described support, and be connected with described superimposed motor and be connected with described main motor by a primary input axle by a stack power shaft;
A plurality of passes, for to the hot rolled seamless steel tube tube reducing, be arranged in order the side in described support along hot rolled seamless steel tube rolling direction, and be connected respectively the rotating speed increased progressively successively with input with described gear train with a power transmission shaft by an output gear cover;
Wherein, the rotating speed of main motor is along with the increase of the external diameter of hot rolled seamless steel tube and wall thickness ratio and increase.
4. central driving reducing mill according to claim 3, is characterized in that,
The stack of described rotating speed comprises 5 gear speed adjustment units than adjusting device, and any gear speed adjustment unit and the external diameter of hot rolled seamless steel tube and the ratio of wall thickness and the corresponding relation of rotating speed stack ratio are:
Wherein, the external diameter that D/S is hot rolled seamless steel tube and the ratio of wall thickness, the external diameter that D is hot rolled seamless steel tube, the wall thickness that S is hot rolled seamless steel tube, described superimposed motor rotating speed is called rotating speed stack ratio with the ratio of described main motor speed.
5. the reducing mill reducing process to hot rolled seamless steel tube, described reducing mill comprises: a main motor and a superimposed motor, all for exporting torque; Support; Gear train, be located in described support, and be connected with described superimposed motor and be connected with described main motor by a primary input axle by a stack power shaft; A plurality of passes, for to the hot rolled seamless steel tube tube reducing, be arranged in order the side in described support, and be connected respectively the rotating speed increased progressively successively with input with described gear train with a power transmission shaft by an output gear cover; It is characterized in that, described reducing process comprises:
Utilize the ratio of the external diameter of hot rolled seamless steel tube and wall thickness to determine the ratio of the rotating speed of the rotating speed of described superimposed motor and described main motor;
Adjust described superimposed motor rotating speed and described main motor speed according to the ratio of rotating speed;
The rotating speed that the torque that the torque that utilizes described main motor to transfer out at described main motor speed backspin and described superimposed motor transfer out at described superimposed motor rotating speed backspin will increase progressively described gear train successively inputs to a plurality of passes;
Utilize a plurality of described passes to the hot rolled seamless steel tube tube reducing;
Wherein, the rotating speed ratio of the rotating speed of described superimposed motor and described main motor is along with the increase of the external diameter of hot rolled seamless steel tube and wall thickness ratio and dwindle.
6. reducing process according to claim 5, it is characterized in that, the external diameter of hot rolled seamless steel tube and wall thickness ratio are called D/S, and described superimposed motor rotating speed is called rotating speed stack ratio with the ratio of described main motor speed, and described D/S with the corresponding relation of rotating speed stack ratio is:
Wherein, the external diameter that D is hot rolled seamless steel tube, the wall thickness that S is hot rolled seamless steel tube.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170658A (en) * | 2015-09-15 | 2015-12-23 | 鑫鹏源智能装备集团有限公司 | Sizing machine |
| CN110227715A (en) * | 2019-06-18 | 2019-09-13 | 唐山学院 | Plate rolling device with polishing function |
| CN113426834A (en) * | 2021-06-18 | 2021-09-24 | 浙江明贺钢管有限公司 | Sizing mill for seamless steel pipe production |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170658A (en) * | 2015-09-15 | 2015-12-23 | 鑫鹏源智能装备集团有限公司 | Sizing machine |
| CN110227715A (en) * | 2019-06-18 | 2019-09-13 | 唐山学院 | Plate rolling device with polishing function |
| CN110227715B (en) * | 2019-06-18 | 2021-02-23 | 唐山学院 | Plate rolling device with polishing function |
| CN113426834A (en) * | 2021-06-18 | 2021-09-24 | 浙江明贺钢管有限公司 | Sizing mill for seamless steel pipe production |
| CN113426834B (en) * | 2021-06-18 | 2022-11-22 | 浙江明贺钢管有限公司 | Sizing mill for seamless steel pipe production |
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| Publication number | Publication date |
|---|---|
| CN103447300B (en) | 2015-08-05 |
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