CN1116133C - Method for controlling length and position of mandrel in use - Google Patents
Method for controlling length and position of mandrel in use Download PDFInfo
- Publication number
- CN1116133C CN1116133C CN 00110897 CN00110897A CN1116133C CN 1116133 C CN1116133 C CN 1116133C CN 00110897 CN00110897 CN 00110897 CN 00110897 A CN00110897 A CN 00110897A CN 1116133 C CN1116133 C CN 1116133C
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- Prior art keywords
- plug
- speed
- mandrel
- hollow billet
- service
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- Expired - Lifetime
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005096 rolling process Methods 0.000 abstract description 23
- 229910000831 Steel Inorganic materials 0.000 abstract description 11
- 239000010959 steel Substances 0.000 abstract description 11
- 238000003801 milling Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 241000478383 Eleutherodactylus toa Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The present invention discloses a method capable of controlling the use length of a mandrel in a steel pipe mandrel mill, which comprises the following steps that a hollow billet speed V0 is determined; a mandrel speed V2 to be adjusted is determined, a running speed of the mandrel is adjusted from the V1 to the V2, etc. In the step that the hollow billet moving speed V0 is determined, two detectors separated in a certain distance are at least arranged, and a signal receiving processing computer is also arranged for counting the V0 and the V2. The present invention has the characteristics that the surface of the mandrel can be evenly worn on the length, the service life of the mandrel is improved, the position required by the mandrel can be controlled, the special requirements in the steel pipe rolling, and the productivity and the yield rate are improved.
Description
Technical field:
The present invention relates to a kind of method of controlling plug, a kind of method of using plug length and position of controlling of more specifically saying so.
Background technology:
Plug is the important component part of plug milling train.The plug milling train is a kind of of pipe-mill, and in the plug milling train, outer warp tool is several rolls, and the internal strain instrument is a kind of plug.In the plug milling train, can be divided into restraint, semifloating, floating core rod milling train according to the running status of its plug.Restraint, semifloating plug milling train are when rolling, and steel pipe is with rolling advancing of speed, and plug advances (or retreating) with qualification speed, rolling finishing, and steel pipe advances, and in the retained mandrel milling train, restraint device drives plug and retreats fast; In semifloating plug milling train, plug breaks away from restraint device, advances with steel pipe and leaves milling train.The restraint speed of retained mandrel is generally a fixing speed V1, evenly advances or retreats, and the basis of design of this restraint speed is mill speed and hollow billet length.Mill speed changes because of the variation of roller diameter, roll rotational speed, advancing angle; Hollow billet length also changes because of the variation of the wall thickness of the difference of pipe length and hollow billet.For guaranteeing that the longest hollow billet is when the slowest mill speed, can all be rolled down on the plug, so set a plug restraint speed, this speed generally is constant in rolling, the result who brings like this is: when mill speed one timing, long hollow billet is rolled down on the length of plug longer, and relatively short hollow billet is rolled down on the plug length short; When one timing of hollow billet length, slower mill speed is rolled down on the plug length more longer, and mill speed is rolled down on the plug length short faster.This has just caused plug evenly rolling on can not overall length, and heavier when the rolling wearing and tearing of plug front end, in the time of can not continuing to use, and the plug afterbody also have rolling wearing and tearing, or rolling wearing and tearing are slight.But such plug also can only be scrapped and change, and has caused the serious waste of plug.
Summary of the invention:
The purpose of this invention is to provide a kind of in the plug milling train, make mandrel surface uniform wear on its length, improve plug service life, the position that control uses plug to require, satisfy the specific (special) requirements in the steel pipe rolling, boost productivity and the control use plug length of lumber recovery and the method for position.
The objective of the invention is to reach by the following technical programs.This method comprises following 3 steps, determines the step 1 of hollow billet translational speed V0, determines that plug treats the step 2 of speed of service V2, and V1 is adjusted into the step 3 that plug is treated speed of service V2 with the plug speed of service.In the step 1 of determining hollow billet translational speed V0, at least be provided with two detectors that keep at a certain distance away, each detector is surveyed hollow billet respectively through moment of this detection device, establishes a signal and receives process computer, calculates hollow billet translational speed V0 and plug is treated speed of service V2 by it.What of detector, needs according to the working control precision are decided, when control accuracy is high, can establish the detector more than 2, signal receives process computer and repeatedly calculates, so that accurately adjust the plug speed of service, when hollow billet had been rolled, plug can move to the operating point of least significant end from operating point foremost.
Hollow billet described here is meant the rolling steel pipe before of pipe mill.
Because, the present invention has adopted technique scheme, make it compared with prior art, can be by measuring the length and the speed of not rolling hollow billet, reset plug and treat speed of service V2, rolling just on the position that the plug afterbody is set to guarantee the hollow billet afterbody, thus evenly rolling and wearing and tearing on the plug length guaranteed.But also can control the position of use as required, to satisfy the specific (special) requirements in the steel pipe rolling.After implementing the present invention, on general pipe mill, can obtain following effect: 1. bring up to 1300 steel pipes of every mandrel rolling by 1000 steel pipes of every mandrel rolling the service life of plug; 2. the expense of plug reduces by 35% approximately; 3. because the plug life-span improves, reduced the time of changing plug, production efficiency can improve 5-10%.
Description of drawings:
Fig. 1-a kind of processing method flow chart of the present invention;
A kind of structural representation of Fig. 2-retained mandrel pipe mill rolled steel tube.
The specific embodiment:
Provide embodiments of the invention below in conjunction with accompanying drawing, be used for further specifying this technical solution.
Embodiment with reference to figure 1, Fig. 2, supposes that used detector is 2, is respectively detector 7 and detector 8 in determining the step 1 of hollow billet translational speed V0, two some M points on the two corresponding hollow billet 5 and N point, then the distance L mn=1000mm between 2; It is A that plug 6 afterbodys are set a bit, when hollow billet moves forward under the effect of roll 4, just nipping when rolling, detector 7 and detector 8 can both detect the signal that this hollow billet exists, along with rolling carrying out, hollow billet advances, hollow billet at first leaves the N point, detector 8 loss signals, afterwards hollow billet leaves the M point again, detector 7 loss signals, and signal receives the pace V0=Lmn/tmn that process computer is calculated hollow billet rapidly according to the time difference tmn and the distance between the two of these two detector loss signals, if tmn=2s, then V0=1000/2=500 (mm/s).
Treat in the step 2 of speed of service V2 at definite plug, at first measure the distance L om=5000mm of 1 M of hollow billet to operating point O, the time tom=Lom/V0 of rolling hollow billet then, calculate its value through signal reception process computer and be 10s, measure some A that the corresponding hollow billet M of the plug order distance L oa to operating point O then, the restraint device (comprising restraint electrode, transmission case, restraint dolly and control device PC system etc.) by controlling plug is the speed of service V1 and the A point position Loa=3000mm of plug 6 as can be known; Definite at last plug is treated speed of service V2.It is according to being, if guarantee hollow billet is rolling finish after, plug position A point arrives the O point, so their used time identical, i.e. toa=tom is so try to achieve V2=Loa/toa=3000mm/10s=300mm/s by signal reception process computer.
Treat in the step 3 of speed of service V2 in that plug speed of service V1 is adjusted into plug, adjust the restraint device of plug, what make that the speed of service V1=250mm/s of plug brings up to plug treats speed of service V2=300mm/s.
In like manner, also can provide and comprise 3,4 ... X detector determines to use the method for plug length and position.
In like manner, if in rolling, as required, and use plug specially a certain section, as the OB section among Fig. 2, then can adjust the speed of service of plug by above method, achieve the goal.Like this, both can make full use of the not wearing and tearing section of having used plug, improve the utilization rate of plug, reduce cost, can select the use location of plug as required again, reach rolling requirement.
Claims (2)
1, a kind of method of using plug length and position of controlling, it is characterized in that, it is by the step (1) of determining hollow billet translational speed V0, determine that plug treats the step of speed of service V2 (2), plug speed of service V1 is adjusted into plug treats the step of speed of service V2 (3) composition, in the step (1) of determining hollow billet translational speed V0, at least be provided with two detectors that keep at a certain distance away, each detector can measure the moment of hollow billet through himself, be provided with signal and receive process computer, calculate hollow billet translational speed V0 and plug is treated speed of service V2 by it.
2, the method for plug length and position is used in control according to claim 1, it is characterized in that, in the step (1) of determining hollow billet translational speed V0, is provided with two detectors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00110897 CN1116133C (en) | 2000-02-18 | 2000-02-18 | Method for controlling length and position of mandrel in use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00110897 CN1116133C (en) | 2000-02-18 | 2000-02-18 | Method for controlling length and position of mandrel in use |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1308996A CN1308996A (en) | 2001-08-22 |
| CN1116133C true CN1116133C (en) | 2003-07-30 |
Family
ID=4580853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00110897 Expired - Lifetime CN1116133C (en) | 2000-02-18 | 2000-02-18 | Method for controlling length and position of mandrel in use |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1116133C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111530935A (en) * | 2020-05-25 | 2020-08-14 | 苏州东米智能设备有限公司 | Core print fine adjustment device of finned tube forming machine and finned tube forming machine with core print fine adjustment device |
| CN112474827B (en) * | 2020-10-28 | 2022-09-13 | 太原重工股份有限公司 | Automatic control method for reducing fixed-point abrasion of retained mandrel |
-
2000
- 2000-02-18 CN CN 00110897 patent/CN1116133C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1308996A (en) | 2001-08-22 |
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Legal Events
| Date | Code | Title | Description |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: YANTAI LU BAOSTEEL PIPE CO., LTD. Free format text: FORMER OWNER: WANG XUWU Effective date: 20060303 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20060303 Address after: 264002 No. 185 happiness Middle Road, Zhifu District, Shandong, Yantai Patentee after: Yantai Lubao Steel Pipe Co., Ltd. Address before: 264002, Yantai, Shandong Province, 185 happiness Road, Yantai Lu Bao Steel Tube Co., Ltd. Shandong Patentee before: Wang Xuwu |