CN103447300B - Central driving reducing mill and reducing mill are to the reducing process of hot rolled seamless steel tube - Google Patents
Central driving reducing mill and reducing mill are to the reducing process of hot rolled seamless steel tube Download PDFInfo
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- CN103447300B CN103447300B CN201310389397.3A CN201310389397A CN103447300B CN 103447300 B CN103447300 B CN 103447300B CN 201310389397 A CN201310389397 A CN 201310389397A CN 103447300 B CN103447300 B CN 103447300B
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Abstract
The invention provides a kind of central driving reducing mill for hot rolled seamless steel tube rolling and reducing mill to the reducing process of hot rolled seamless steel tube, reducing process comprises: utilize the rotating speed of ratio determination superimposed motor of hot rolled seamless steel tube external diameter and wall thickness and the ratio of the rotating speed of mair motor; According to the ratio adjustment superimposed motor of rotating speed and the rotating speed of mair motor; Mair motor and superimposed motor is utilized to make gear train that the rotating speed increased progressively successively is inputed to multiple pass in the torque that respective rotating speed backspin transfers out; Utilize multiple pass to hot rolled seamless steel tube tube reducing; Wherein the ratio of superimposed motor rotating speed and mair motor rotating speed reduces along with the external diameter of hot rolled seamless steel tube and the increase of wall-thickness ratio.By applying the present invention in the production process of steel pipe, improve the evenness of wall thickness of steel pipe.
Description
Technical field
The present invention relates to hot rolled seamless steel tube rolling technical field, particularly a kind of central driving reducing mill for hot rolled seamless steel tube rolling and reducing mill are to the tube reducing method of 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 substantially 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 arranges by series according to specification, by power shaft with tooth cover is connected after pushing along slideway.
The kind of drive of reducing mill is generally divided into central driving and driven separately, central driving is that a mair motor and a superimposed motor produce one group of speed increased progressively by one group of gear and pass to the multiple passes be arranged in order respectively, and driven separately is that multiple electric motors drives the multiple passes be arranged in order respectively.And the number of pass is generally designed to 10 ~ 24 framves (being generally that multiple pass is located on reducing mill, so the application is also called central driving multi-frame reducing mill).
The rotating speed of the type reducing mill superposes when corresponding transmission system and all adopts fixed structure in use, during actual production, there is comparatively significant differences along its length in the thickness of steel pipe of many specifications, maximumly reach 1.5mm, and be not easily detected, just manifest until user uses, cause the loss being difficult to save.
As from the foregoing, in the production process of hot rolled seamless steel tube, reducing mill is last distortion operation together and Main Function determines external diameter.But the intrinsic deformation characteristics of reducing mill determines that it subtracts steel pipe, can produce impact to a certain degree to wall thickness while sizing.How thickness of steel pipe changing value is alongst controlled in minimum zone, improve steel pipe uniformity dimensionally, thus ensure the performance of steel pipe each side, improving " longitudinal wall unevenness " defect is the pressing issues needing at present to solve.
Summary of the invention
The object of the present invention is to provide a kind of central driving reducing mill for hot rolled seamless steel tube rolling, to solve hot rolled seamless steel tube that prior art exists along the larger problem of its length direction wall thickness change scope.
In order to solve the problem, the invention provides a kind of central driving reducing mill for hot rolled seamless steel tube rolling, it comprises: a mair motor and a superimposed motor, all for Driving Torque; Be connected with described superimposed motor, the rotating speed changing to adjust described superimposed motor for the rotating speed to described superimposed motor according to the external diameter of hot rolled seamless steel tube and the ratio of wall thickness superposes with the rotating speed of the ratio of the rotating speed of described mair motor and compares adjusting device; Support; Gear train, is located in described support, and is connected with described superimposed motor by a superposition power shaft and is connected with described mair motor by a primary input axle; Multiple pass, for hot rolled seamless steel tube tube reducing, is arranged in order the side in described support along hot rolled seamless steel tube rolling direction, and is connected with described gear train with a power transmission shaft respectively by an output gear cover, to input the rotating speed increased progressively successively; Wherein, the rotating speed of described superimposed motor reduces along with the external diameter of hot rolled seamless steel tube and the increase of wall-thickness ratio; Described superimposed motor is direct current generator, and described mair motor is direct current generator or alternating current generator.
Preferably, the superposition of described rotating speed comprises than adjusting device the gear speed adjustment unit that 5 sequence numbers are respectively 1,2,3,4,5, and the corresponding relation that the gear speed adjustment unit that described 5 sequence numbers are respectively 1,2,3,4,5 and the external diameter of hot rolled seamless steel tube and the ratio of wall thickness and rotating speed superpose ratio is:
| Gear unit number | D/S | Rotating speed superposition 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, D/S is the external diameter of hot rolled seamless steel tube and the ratio of wall thickness, and D is the external diameter of hot rolled seamless steel tube, and S is the wall thickness of hot rolled seamless steel tube, and described superimposed motor rotating speed and the ratio of described mair motor rotating speed are called that rotating speed superposes ratio.
In order to solve the problem, the invention provides the another kind of central driving reducing mill for hot rolled seamless steel tube rolling, this central driving reducing mill comprises: a mair motor and a superimposed motor, all for Driving Torque; Be connected with described mair motor, the rotating speed for changing to adjust described superimposed motor to the rotating speed of described mair motor to superpose with the rotating speed of the ratio of the rotating speed of described mair motor and compares adjusting device; Support; Gear train, is located in described support, and is connected with described superimposed motor by a superposition power shaft and is connected with described mair motor by a primary input axle; Multiple pass, for hot rolled seamless steel tube tube reducing, is arranged in order the side in described support along hot rolled seamless steel tube rolling direction, and is connected with described gear train with a power transmission shaft respectively by an output gear cover, to input the rotating speed increased progressively successively; Wherein, the rotating speed of mair motor increases along with the external diameter of hot rolled seamless steel tube and the increase of wall-thickness ratio; Described superimposed motor is direct current generator, and described mair motor is direct current generator or alternating current generator.
Preferably, the superposition of described rotating speed comprises than adjusting device the gear speed adjustment unit that 5 sequence numbers are respectively 1,2,3,4,5, and the corresponding relation that the gear speed adjustment unit that described 5 sequence numbers are respectively 1,2,3,4,5 and the external diameter of hot rolled seamless steel tube and the ratio of wall thickness and rotating speed superpose ratio is:
| Gear unit number | D/S | Rotating speed superposition 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, D/S is the external diameter of hot rolled seamless steel tube and the ratio of wall thickness, and D is the external diameter of hot rolled seamless steel tube, and S is the wall thickness of hot rolled seamless steel tube, and described superimposed motor rotating speed and the ratio of described mair motor rotating speed are called that rotating speed superposes ratio.
In order to solve the problem, present invention also offers the reducing process of a kind of reducing mill to hot rolled seamless steel tube, this reducing mill comprises: a mair motor and a superimposed motor, all for Driving Torque; Support; Gear train, is located in described support, and is connected with described superimposed motor by a superposition power shaft and is connected with described mair motor by a primary input axle; Multiple pass, for hot rolled seamless steel tube tube reducing, is arranged in order the side in described support, and is connected with described gear train with a power transmission shaft respectively by an output gear cover, to input the rotating speed increased progressively successively; Described reducing process comprises:
The external diameter of hot rolled seamless steel tube and the ratio of wall thickness is utilized to determine the ratio of the rotating speed of described superimposed motor and the rotating speed of described mair motor;
Described superimposed motor rotating speed and described mair motor rotating speed is adjusted according to the ratio of described rotating speed;
The torque that the torque utilizing described mair motor to transfer out at described mair motor rotating speed backspin and described superimposed motor transfer out at described superimposed motor rotating speed backspin makes described gear train that the rotating speed increased progressively successively is inputed to multiple pass;
Utilize multiple described pass to hot rolled seamless steel tube tube reducing;
Wherein, the rotating speed of described superimposed motor and the rotating speed ratio of described mair motor reduce along with the external diameter of hot rolled seamless steel tube and the increase of wall-thickness ratio.
Preferably, external diameter and the wall-thickness ratio of hot rolled seamless steel tube are called D/S, with the ratio of described mair motor rotating speed, described superimposed motor rotating speed is called that rotating speed superposes ratio, and described D/S superposes ratio corresponding relation with rotating speed is:
| D/S | Rotating speed superposition 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, D is the external diameter of hot rolled seamless steel tube, and S is the wall thickness of hot rolled seamless steel tube.
The present invention is based on the research to variation tendency between rotating speed superposition ratio and D/S, all gauge steel thicknesss of pipe wall can be controlled along its length within 0.4mm, compared with prior art, the wall thickness variation defect of hot rolled seamless steel tube is improved amplitude and is reached 70%, improves product quality.
Accompanying drawing explanation
The schematic top plan view of a kind of central driving reducing mill for hot rolled seamless steel tube rolling that Fig. 1 provides for the embodiment of the present invention one;
Fig. 2 is the main TV structure schematic diagram of support in Fig. 1;
Fig. 3 is the schematic side view of support in Fig. 1 and 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;
A kind of reducing mill that Fig. 5 provides for the embodiment of the present invention two is to the schematic flow sheet of the reducing process of hot rolled seamless steel tube.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
Embodiment one
Fig. 1-Fig. 3 schematically illustrates the structure of a kind of central driving reducing mill for hot rolled seamless steel tube rolling that the embodiment of the present invention provides, as shown in the figure, the present embodiment mainly comprises mair motor 11, superimposed motor 12, rotating speed superposition than adjusting device 32, primary input axle 21, superposition power shaft 22, support 3, gear train 4, output gear cover 5, power transmission shaft 6 and pass 7.
Wherein, mair motor 11, superimposed motor 12 are all for Driving Torque and quantity is respectively one, and superimposed motor 12 rotating speed and the ratio of mair motor 11 rotating speed are referred to as rotating speed and superpose ratio.Rotating speed superposition is connected to superimposed motor 12 than adjusting device 32, rotating speed superposition ratio is adjusted for changing according to the rotating speed of D/S to superimposed motor, gear train 4 is located in support 3, and is connected with superimposed motor 12 by superposition power shaft 22 and is connected with mair motor 11 by primary input axle 21.Multiple pass 7 is for hot rolled seamless steel tube tube reducing, along hot rolled seamless steel tube rolling direction from mouth of nipping to stinging the side exporting and be arranged in order in support 3, and be connected with gear train 4 with a power transmission shaft 6 respectively by an output gear cover 5, to input the rotating speed increased progressively successively.Wherein, D/S is the external diameter of hot rolled seamless steel tube and the ratio of wall thickness, D is the external diameter of hot rolled seamless steel tube, S is the wall thickness of hot rolled seamless steel tube, and the rotating speed of superimposed motor reduces along with the external diameter of hot rolled seamless steel tube 9 and the increase of wall-thickness ratio to meet rotating speed superposition than reducing along with the increase of D/S.
Preferably, rotating speed superposition comprises than adjusting device the gear speed adjustment unit that 5 sequence numbers are respectively 1,2,3,4,5, and the gear speed adjustment unit that 5 sequence numbers are respectively 1,2,3,4,5 superposes ratio corresponding relation with D/S and rotating speed is:
| Gear unit number | D/S | Rotating speed superposition 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, embodiments provide the another kind of central driving reducing mill for hot rolled seamless steel tube rolling, wherein, mair motor 11, superimposed motor 12, primary input axle 21, superposition power shaft 22, support 3, gear train 4, output gear cover 5, power transmission shaft 6 is identical with above-mentioned embodiment with pass 7, connect and mair motor than adjusting device 31 unlike the superposition of present embodiment medium speed, wherein the rotating speed of mair motor increases along with the external diameter of hot rolled seamless steel tube 9 and the increase of wall-thickness ratio to meet rotating speed superposition than reducing along with the increase of D/S.
It should be noted that superimposed motor is direct current generator, the rotating speed be connected with superimposed motor superposes and is preferably resistor adjusting device than adjusting device 32; Mair motor can be direct current generator can also be alternating current generator, and the rotating speed be connected with mair motor superposes and is preferably power supply frequency conversion adjusting device than adjusting device 31, changes the frequency of mair motor power supply to change the rotating speed of mair motor.
Because the gearratio of each root output gear cover 5 of gear train 4 correspondence is constant, when rotating speed superposition is than when changing, also corresponding change will be there is in the amplitude that between power transmission shaft 6, rotating speed increases progressively, the change of metal flow second flow in synchronous impact to pass 7, and cause wall thickness change in various degree.
Data corresponding relation between being changed by collection, analysis rotating speed superposition ratio and different size thickness of steel pipe, a more accurate rotating speed corresponding with D/S value can be established and superpose ratio, the wall thickness change along its length of the hot rolled seamless steel tube 9 of all specifications can be controlled within 0.4mm thus.
Adjusting device is compared by arranging rotating speed superposition, make this reducing mill that the rotating speed of suitable superimposed motor and the rotating speed ratio of mair motor are set according to the external diameter of hot rolled seamless steel tube and the different ratios of wall thickness, thus the change along its length of the wall thickness of the hot rolled seamless steel tube of all specifications controlled within 0.4mm, and then improve product quality.
Embodiment two
Fig. 5 schematically illustrates reducing mill that the embodiment of the present invention two provides to the tube reducing method of hot rolled seamless steel tube, this reducing mill and the reducing mill in above-described embodiment one are distinguished part and are that not having rotating speed to superpose compares adjusting device, namely mair motor does not superpose with rotating speed and is connected than adjusting device, superimposed motor superpose with rotating speed yet and is connected than adjusting device, the mair motor 11 that this reducing mill comprises, superimposed motor 12, primary input axle 21, superpose power shaft 22, support 3, gear train 4, output gear overlap 5, power transmission shaft 6 is identical with above-described embodiment one with pass 7.That is: mair motor 11, superimposed motor 12 are all for Driving Torque and quantity is respectively one, and superimposed motor 12 rotating speed and the ratio of mair motor 11 rotating speed are referred to as rotating speed and superpose ratio.Gear train 4 is located in support 3, and is connected with superimposed motor 12 by superposition power shaft 22 and is connected with mair motor 11 by primary input axle 21.Multiple pass 7 is for hot rolled seamless steel tube 7 tube reducing, along hot rolled seamless steel tube rolling direction from mouth of nipping to stinging the side exporting and be arranged in order in support 3, and be connected with gear train 4 with a power transmission shaft 6 respectively by an output gear cover 5, to input the rotating speed increased progressively successively.In other words quantity and the output gear of pass 7 overlap 5 quantity and the quantity of power transmission shaft 6 identical.
The tube reducing method of above-mentioned reducing mill to hot rolled seamless steel tube is adopted to comprise:
The rotating speed of ratio determination superimposed motor of step 110, the external diameter utilizing hot rolled seamless steel tube and wall thickness and the ratio of the rotating speed of mair motor;
In practice, the external diameter of hot rolled seamless steel tube and the ratio of wall thickness larger, then the ratio of the rotating speed of superimposed motor and the rotating speed of mair motor is less.
External diameter and the wall-thickness ratio of hot rolled seamless steel tube are called D/S, and superimposed motor rotating speed and the ratio of mair motor rotating speed are called that rotating speed superposes ratio, and preferably, D/S superposes ratio corresponding relation with rotating speed is
| D/S | Rotating speed superposition 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 adjustment superimposed motor rotating speed and mair motor rotating speed;
In practice, the rotating speed of mair motor can be fixed, the rotating speed of adjustment superimposed motor is to meet the ratio of rotating speed, the rotating speed of all right fixed overlay motor, the rotating speed of adjustment mair motor is to meet the ratio of rotating speed, also can adjust the rotating speed of mair motor and the rotating speed of superimposed motor to meet the ratio of rotating speed, the present embodiment does not limit this simultaneously.
Step 130, the torque utilizing mair motor to transfer out at mair motor rotating speed backspin and superimposed motor make gear train that the rotating speed increased progressively successively is inputed to multiple pass in the torque that superimposed motor rotating speed backspin transfers out;
Step 140, utilize multiple pass to hot rolled seamless steel tube tube reducing.
By the ratio according to the external diameter of hot rolled seamless steel tube and the different rotating speed of ratio determination superimposed motor of wall thickness and the rotating speed of mair motor, again according to the ratio adjustment rotating speed of superimposed motor and the rotating speed of mair motor of this rotating speed, thus the change along its length of the wall thickness of the hot rolled seamless steel tube of all specifications controlled within 0.4mm, and then improve product quality.
With specification be below the hot rolled seamless steel tube of ∮ 95*10mm for example illustrates effect of the present invention.
For the size hot-rolled seamless steel pipe of ∮ 95*10mm, conventionally setting speed superposition is than when being 60% (all specifications all adopt this value), and maximum two the cross section wall thickness of difference are respectively (10.8,10.5,10.3,9.7) and (9.7,9.5,9.05,8.7).According to the present embodiment, due to the ratio 95/10=9.5>6 of external diameter and wall thickness, then select with rotating speed superposition ratio 35% corresponding to this specification, by rotating speed is superposed than being adjusted to 35%, maximum two the cross section wall thickness of difference are 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 and four some one_to_one corresponding of second bracket, first point in first point such as above in bracket and below bracket is positioned on the same straight line parallel with axis).
To sum up, within the wall thickness change along its length of hot rolled seamless steel tube that the present invention produces can be controlled in 0.4mm, improvement amplitude reaches 70%, the improvement product quality of high degree.
As known by the technical knowledge, the present invention can be realized by other the embodiment not departing from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment, with regard to each side, all just illustrates, is not only.Within the scope of the present invention all or be all included in the invention being equal to the change in scope of the present invention.
Claims (6)
1., for a central driving reducing mill for hot rolled seamless steel tube rolling, it is characterized in that, comprising:
One mair motor and a superimposed motor, all for Driving Torque;
Be connected with described superimposed motor, the rotating speed changing to adjust described superimposed motor for the rotating speed to described superimposed motor according to the external diameter of hot rolled seamless steel tube and the ratio of wall thickness superposes with the rotating speed of the ratio of the rotating speed of described mair motor and compares adjusting device;
Support;
Gear train, is located in described support, and is connected with described superimposed motor by a superposition power shaft and is connected with described mair motor by a primary input axle;
Multiple pass, for hot rolled seamless steel tube tube reducing, is arranged in order the side in described support along hot rolled seamless steel tube rolling direction, and is connected with described gear train with a power transmission shaft respectively by an output gear cover, to input the rotating speed increased progressively successively;
Wherein, the rotating speed of described superimposed motor reduces along with the external diameter of hot rolled seamless steel tube and the increase of wall-thickness ratio;
Described superimposed motor is direct current generator, and described mair motor is direct current generator or alternating current generator.
2. central driving reducing mill according to claim 1, is characterized in that,
The superposition of described rotating speed comprises than adjusting device the gear speed adjustment unit that 5 sequence numbers are respectively 1,2,3,4,5, and the corresponding relation that the gear speed adjustment unit that described 5 sequence numbers are respectively 1,2,3,4,5 and the external diameter of hot rolled seamless steel tube and the ratio of wall thickness and rotating speed superpose ratio is:
Wherein, D/S is the external diameter of hot rolled seamless steel tube and the ratio of wall thickness, and D is the external diameter of hot rolled seamless steel tube, and S is the wall thickness of hot rolled seamless steel tube, and described superimposed motor rotating speed and the ratio of described mair motor rotating speed are called that rotating speed superposes ratio.
3., for a central driving reducing mill for hot rolled seamless steel tube rolling, it is characterized in that, comprising:
One mair motor and a superimposed motor, all for Driving Torque;
Be connected with described mair motor, the rotating speed for changing to adjust described superimposed motor to the rotating speed of described mair motor to superpose with the rotating speed of the ratio of the rotating speed of described mair motor and compares adjusting device;
Support;
Gear train, is located in described support, and is connected with described superimposed motor by a superposition power shaft and is connected with described mair motor by a primary input axle;
Multiple pass, for hot rolled seamless steel tube tube reducing, is arranged in order the side in described support along hot rolled seamless steel tube rolling direction, and is connected with described gear train with a power transmission shaft respectively by an output gear cover, to input the rotating speed increased progressively successively;
Wherein, the rotating speed of mair motor increases along with the external diameter of hot rolled seamless steel tube and the increase of wall-thickness ratio;
Described superimposed motor is direct current generator, and described mair motor is direct current generator or alternating current generator.
4. central driving reducing mill according to claim 3, is characterized in that,
The superposition of described rotating speed comprises than adjusting device the gear speed adjustment unit that 5 sequence numbers are respectively 1,2,3,4,5, and the corresponding relation that the gear speed adjustment unit that described 5 sequence numbers are respectively 1,2,3,4,5 and the external diameter of hot rolled seamless steel tube and the ratio of wall thickness and rotating speed superpose ratio is:
Wherein, D/S is the external diameter of hot rolled seamless steel tube and the ratio of wall thickness, and D is the external diameter of hot rolled seamless steel tube, and S is the wall thickness of hot rolled seamless steel tube, and described superimposed motor rotating speed and the ratio of described mair motor rotating speed are called that rotating speed superposes ratio.
5. reducing mill is to a reducing process for hot rolled seamless steel tube, and described reducing mill comprises: a mair motor and a superimposed motor, all for Driving Torque; Support; Gear train, is located in described support, and is connected with described superimposed motor by a superposition power shaft and is connected with described mair motor by a primary input axle; Multiple pass, for hot rolled seamless steel tube tube reducing, is arranged in order the side in described support, and is connected with described gear train with a power transmission shaft respectively by an output gear cover, to input the rotating speed increased progressively successively; It is characterized in that, described reducing process comprises:
The external diameter of hot rolled seamless steel tube and the ratio of wall thickness is utilized to determine the ratio of the rotating speed of described superimposed motor and the rotating speed of described mair motor;
Described superimposed motor rotating speed and described mair motor rotating speed is adjusted according to the ratio of described rotating speed;
The torque that the torque utilizing described mair motor to transfer out at described mair motor rotating speed backspin and described superimposed motor transfer out at described superimposed motor rotating speed backspin makes described gear train that the rotating speed increased progressively successively is inputed to multiple pass;
Utilize multiple described pass to hot rolled seamless steel tube tube reducing;
Wherein, the rotating speed of described superimposed motor and the rotating speed ratio of described mair motor reduce along with the external diameter of hot rolled seamless steel tube and the increase of wall-thickness ratio.
6. reducing process according to claim 5, it is characterized in that, external diameter and the wall-thickness ratio of hot rolled seamless steel tube are called D/S, with the ratio of described mair motor rotating speed, described superimposed motor rotating speed is called that rotating speed superposes ratio, and described D/S superposes ratio corresponding relation with rotating speed is:
Wherein, D is the external diameter of hot rolled seamless steel tube, and S is the wall thickness of hot rolled seamless steel tube.
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| CN105170658B (en) * | 2015-09-15 | 2020-01-24 | 鑫鹏源智能装备集团有限公司 | Sizing mill |
| CN110227715B (en) * | 2019-06-18 | 2021-02-23 | 唐山学院 | Plate rolling device with polishing function |
| 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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Address after: 435001 Huangshi Road, Hubei, Huangshi, No. 316 Patentee after: Daye Special Steel Co., Ltd Address before: 435001 Huangshi Road, Hubei, Huangshi, No. 316 Patentee before: Hubei Xinyegang Special Steel Tube Co., Ltd. |