CN101249506A - Posted sides seamless steel pipe roller milling method - Google Patents
Posted sides seamless steel pipe roller milling method Download PDFInfo
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- CN101249506A CN101249506A CNA2008100154748A CN200810015474A CN101249506A CN 101249506 A CN101249506 A CN 101249506A CN A2008100154748 A CNA2008100154748 A CN A2008100154748A CN 200810015474 A CN200810015474 A CN 200810015474A CN 101249506 A CN101249506 A CN 101249506A
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Abstract
The invention discloses a novel rolling method for thick-wall seamless steel pipes, which can manufacture the seamless steel pipe with high strength, small diameter and extra-thick wall by continuously re-rolling an on-line rough pipe by a three-roller skew rolling process using the waste heat temperature of the rough pipe. The final seamless pipe has the advantages of high size accuracy, small geometrical deviation, good comprehensive product performance, etc. by reducing diameter and increasing wall thickness of the on-line rough pipe by one step, thus improving the material utilization rate and the production efficiency, completely obviating the environment pollution, and significantly reducing the labor intensity. The main performance detection results of the seamless steel pipe comprise yield strength larger than 465 MPa, tensile strength larger than 765 MPa and extensibility larger than 21.5%, and mechanical and hydraulic tests show that each performance index is superior to the standard of cold drawing technology.
Description
Technical field
The present invention relates to a kind of milling method of seamless steel pipe.
Background technology
At present, the diameter traditional manufacturing technique that is less than or equal to 108 millimeters thick-wall seamless is only limited to the cold-drawn technology of using.Its technological process is: at first with pipe through the heating of annular furnace or inclined stove, pierced billet becomes the heavy wall shell through punch, rolls off the production line then to plough under the pneumatic hammer place and take the lead.After treating shell cooling, need through pickling, phosphatization, saponification, and take the lead once more, repeatedly annealing and frequently mold exchange more, its technology is loaded down with trivial details, not only contaminated environment but also increase labour intensity, more because heavy wall shell resistance of deformation is big, sizing reduction is little, and the draw passage is many, and production efficiency is extremely low.
If solid round steel is through annular furnace or the heating of inclined stove, pierced billet becomes the heavy wall shell through punch, utilize the waste heat (online shell still remains on 850 ℃-950 ℃) of the online shell in perforation back to continue rolling, make its tube reducing increase wall by once, return round moulding, be made into and accord with the demands of the market, particularly machining is with special heavy wall, small-bore, high strength seamless steel pipe, reduce operation, ban cold-drawn, the some effective that energy savings, reduction consume produces great economic benefit simultaneously beyond doubt.
Summary of the invention
Technical problem to be solved by this invention provides a kind of waste heat of shell that utilizes makes online shell tube reducing increase the posted sides seamless steel pipe roller milling method that wall is made thick-walled seamless steel pipes.
For solving the problems of the technologies described above, technical scheme of the present invention is: posted sides seamless steel pipe roller milling method may further comprise the steps:
First step blank perforation step: solid round steel is through annular furnace or the heating of inclined stove, and pierced billet becomes the heavy wall shell through punch, then the online shell of high temperature is delivered to next step rapidly;
The second step supplying step: the high temperature shell is delivered to rolling device, give the thrust of high temperature shell simultaneously by rolling device, conveying device adopts three equally distributed conveying rollers, conveying roller is the gradient that necessarily has advancing angle to be installed, and promptly the track of conveying roller and shell contact point is a helix;
Rolling step of the 3rd step: adopt three equally distributed roll mill form, roll is the gradient with certain advancing angle and installs, the track that is roll and the rolling contact point of shell is a helix, three rollers rotate the inclined cutout extruding simultaneously, impel metal flow, and keep rolling equilibrium of forces and improve rolling quality, can not put core bar in the shell and support, to reach the effect that tube reducing increases wall.
As to improvement of the technical scheme, before beginning, described rolling step at first determines sizing reduction, formulate rolling pass then, and calculate the roll that increases wall scope, selected respective angles, determine mill speed, and adjust the mis-cut angle of three rolls.
Owing to adopted technique scheme, utilize the shell waste heat supply temperature, adopt three roller inclined cutout rolling mill practices, online shell is rerolled continuously, produced intensity height, special thick-walled seamless steel pipes that diameter is little; Increase the wall one-shot forming by online shell tube reducing, make the finished product seamless pipe have characteristics such as dimensional accuracy height, geometrical deviation are little, product good combination property, improved stock utilization and production efficiency, thoroughly avoided environmental pollution, obviously reduced labour intensity.The main performance testing result is as follows: yield strength＞465MPa; Tensile strength＞765MPa; Percentage elongation＞21.5%; Every performance indications all are better than the standard of cold-drawn technology by the every mechanics and the water pressure test.
The specific embodiment
The rolling new method of thick-wall seamless, concrete steps are as follows:
The blank perforation step: solid round steel is through annular furnace or the heating of inclined stove, and pierced billet becomes the heavy wall shell through punch, then the online shell of high temperature is delivered to next step rapidly.
Supplying step: the high temperature shell is delivered to rolling device, give the thrust of high temperature shell simultaneously by rolling device, conveying device adopts three equally distributed conveying rollers, and conveying roller is the gradient that necessarily has advancing angle to be installed, and promptly the track of conveying roller and shell contact point is a helix.
Transport conveyor constructions form and function: corresponding with rolling device, three conveying rollers of uniform installation are coaxial with the rolling device roll line on the hexagon frame.Axis and roll line tilt 3 degree-8 degree in its structure proximate rolling device, conveying roller, and its inclination angle is for carrying advancing angle.Use the buncher transmission, at first, connect the support plate of being furnished with three driven gears through output shaft being changed into the involute formula reductor of hollow shaft shape.Transmission driven gear and connect to carry roll shaft by universal drive shaft rotates its conveying roller inclined cutout then.Conveying roller three roller storing forms are one of top, two of bottoms.Three roll spacings equate that from equilateral two of bottoms are furnished with adjustment leading screw and its adjustment handwheel, utilize the size of roll spacing, calculate the corresponding specification of mother tube diameter, lock after the manual setting.And configuration worm-gear speed reducer in top utilizes the worm gear interstitial hole to process internal thread, and leading screw is supporting with adjusting, and utilizes the motor forward and backward---the transmission worm-gear speed reducer makes the leading screw oscilaltion arbitrarily adjust the conveying roller distance.
Rolling step: adopt three equally distributed roll mill form, roll is the gradient with certain advancing angle and installs, the track that is roll and the rolling contact point of shell is a helix, three rollers rotate the inclined cutout extruding simultaneously, impel metal flow, and keep rolling equilibrium of forces and improve rolling quality, can not put core bar in the shell and support, to reach the effect that tube reducing increases wall.
Rolling device version and process flow:
(1), the rolling device mainframe adopts hexagonal shape
Be convenient to 120 degree and divide equally three rolls of layout, the storing form is one on top, two of bottoms, and three roll spacings equate from equilateral.Axis and roll line tilt 3 degree-8 degree in the roll, and its inclination angle is rolling advancing angle.Through machine driving, thereby roll is because of advancing angle inclined cutout rotation rolled steel tube and reach.
(2), rolling device adopts three roller inclined cutout rolling modes
Selecting the three-roll rolling form, is because three rollers rotate rollingly simultaneously, need not add guide plate arrangement, has both reduced the tangent direction friction resistance, has decomposed the rolling stress of steel pipe again, thereby has improved the roll-force of this hot-rolling mill.Simultaneously can recover and improve external diameter fineness again.
(3), rolling device mechanical driving device
By motor power, by deceleration transmission of horizontal reductor, connect the vertical type speed reducer (change gear) secondary speed-reducing, three output shafts with the uniform configuration of vertical type speed reducer (change gear) connect roll mandrel by universal drive shaft simultaneously, and its roll inclined cutout is rotated.
The horizontal reductor of external toothing involute cylindrical gear.Each one of output shaft and power shaft.Its version is that two axial cylindrical helical teeth levels are cut apart totally enclosed type.
Made external toothing involute cylindrical gear vertical type speed reducer (change gear) as supporting research and development simultaneously.Three of output shafts of power shaft.Its version is four axial cylindrical helical teeth volume segmentation totally enclosed types.
Vertical and horizontal reductor lubricating oil is all contained in internal body, and each fulcrum is all used rolling bearing, and its end play can be with outside platen adjustment.
Because the operation of rolling of steel pipe is the roll line reach along the tangent center of three rollers, so the power shaft of the output shaft of horizontal reductor and vertical type speed reducer (change gear) is adopted hollow thick-walled pipe and be connected to form one with terminal pad.Rolling steel pipe is walked from the centre.
Because of hot rolling, must place the water pipe of water circulation cooling device in the reductor hollow shaft, water-jet is gone into the hollow shaft madial wall, the centrifugal force that forms because of rotation makes water at wall uniform decrease in temperature in week.
So the advantage of design typification is: both guaranteed the concentricity of steel pipe and roll line, convenient again test steel pipe trend is parallel with the reductor center.Because of hollow thick-walled pipe substitutes axle, need dilated diameter again, make bearing in reduction gears type selecting increasing whereby, thereby strengthened the load-carrying ability of bearing, prolong its service life.
(4), three roller sizings are adjusted mode
Because the hexagon mainframe is by the uniform device of three rollers of 120 degree.The seat of two pairs of angle bearings in respectively placing, the two ends of each roll shaft is housed.Two bearing blocks are configured in again on the T profile shaft, and the T profile shaft places regulating sleeve again and is fixed on and is configured to three angular ranges in the mainframe.
Three rollers are cut to equilateral triangle mutually, separately about, can adjust the entad distance of each roll, can make rolling production tube diameter accurate degree adjustable, ovality is little.As starting simultaneously up and down, the entad distance of three rollers is equated, thereby utilize the size of roll spacing, calculate the corresponding specification of diameter.
Three roll difference separate configurations leading screws and its adjustment are taken turns, and utilize the rotation distance of leading screw pitch, substitute scale, do with reference.Can adjust separately, again can be equal according to distance between the roll, to adjust successively in proper order, the roll spacing that reaches three rollers is measure-alike, calculates the corresponding specification of diameter, thereby is out of shape sizing arbitrarily.
(5), rolling flow process
Adjust the roll roll spacing, the diameter specifications of fixed deformation sizing.Start the buncher of rolling device,, shell is nipped by three rollers rotate simultaneously with roll and advance, finish until finish to gauge by the three roller occlusal areas of conveying device conveying roller with shell rotation feeding rolling device.
The blanking rack height is adjusted into concentric parallel with roll line according to the production tube diameter dimension, the production tube after rolling rotates on the blanking rack, by leverage material is routed up, and rolling process is finished.
In above procedure of processing, adopt the circulating water cooling system of known technology
(1), because hot rolling, rolling unit is when work, the protection of lubricating components such as bearing need cool, particularly inside and outside the and roll chock of roll more needs the configuration of circulating water cooling system.
(2), steel pipe after rolling, according to standard and customer requirements needs, utilize waste heat, online heat treatment cooling.
Method technical process of the present invention is simple, utilization utilizes the waste heat and the three roller inclined cutout hot rolling technologies of shell, use the inventor to invent the inner-cooled roll (gain the national patent of manufacturing, patent No. ZL200420097971.4), make mother tube with shell, roll out high strength, minor diameter, double extra-strong finished product seamless pipe through repeatedly testing to have produced.
Claims (3)
1. posted sides seamless steel pipe roller milling method is characterized in that: may further comprise the steps:
First step blank perforation step: solid round steel is through annular furnace or the heating of inclined stove, and pierced billet becomes the heavy wall shell through punch, then the online shell of high temperature is delivered to next step rapidly;
The second step supplying step: the high temperature shell is delivered to rolling device, give the thrust of high temperature shell simultaneously by rolling device, conveying device adopts three equally distributed conveying rollers, conveying roller is the gradient that necessarily has advancing angle to be installed, and promptly the track of conveying roller and shell contact point is a helix;
Rolling step of the 3rd step: adopt three equally distributed roll mill form, roll is the gradient with certain advancing angle and installs, the track that is roll and the rolling contact point of shell is a helix, three rollers rotate the inclined cutout extruding simultaneously, impel metal flow, and keep rolling equilibrium of forces and improve rolling quality, can not put core bar in the shell and support, to reach the effect that tube reducing increases wall.
2. the rolling new method of thick-wall seamless as claimed in claim 1, it is characterized in that: at first determine sizing reduction before described rolling step begins, formulate rolling pass then, and calculate the roll increase wall scope, selected respective angles, determine mill speed, and adjust the mis-cut angle of three rolls.
3. the rolling new method of thick-wall seamless as claimed in claim 1 is characterized in that: described roll is the inner-cooled roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100154748A CN101249506A (en) | 2008-04-02 | 2008-04-02 | Posted sides seamless steel pipe roller milling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100154748A CN101249506A (en) | 2008-04-02 | 2008-04-02 | Posted sides seamless steel pipe roller milling method |
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| Publication Number | Publication Date |
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| CN101249506A true CN101249506A (en) | 2008-08-27 |
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| CNA2008100154748A Pending CN101249506A (en) | 2008-04-02 | 2008-04-02 | Posted sides seamless steel pipe roller milling method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688888A (en) * | 2012-06-15 | 2012-09-26 | 杜斌 | Rolling process of screw pump stator or rotor |
| CN103071679A (en) * | 2011-10-25 | 2013-05-01 | 都江堰市鑫奥岩土锚固材料有限公司 | One-step forming technology of hollow anchor rod |
| CN109604369A (en) * | 2018-09-14 | 2019-04-12 | 山东庆云三友机械电器有限公司 | Precision seamless steel tubes production technology |
| CN110170529A (en) * | 2019-05-22 | 2019-08-27 | 山西太钢不锈钢股份有限公司 | A kind of hot piercing method of high alloy heat-resistance stainless steel hollow billet |
| CN114289512A (en) * | 2021-12-31 | 2022-04-08 | 江苏银环精密钢管有限公司 | A method for precise feeding of U-shaped seamless pipes for high-pressure heaters |
-
2008
- 2008-04-02 CN CNA2008100154748A patent/CN101249506A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103071679A (en) * | 2011-10-25 | 2013-05-01 | 都江堰市鑫奥岩土锚固材料有限公司 | One-step forming technology of hollow anchor rod |
| CN102688888A (en) * | 2012-06-15 | 2012-09-26 | 杜斌 | Rolling process of screw pump stator or rotor |
| CN102688888B (en) * | 2012-06-15 | 2015-01-21 | 杜斌 | Rolling process of screw pump stator or rotor |
| CN109604369A (en) * | 2018-09-14 | 2019-04-12 | 山东庆云三友机械电器有限公司 | Precision seamless steel tubes production technology |
| CN110170529A (en) * | 2019-05-22 | 2019-08-27 | 山西太钢不锈钢股份有限公司 | A kind of hot piercing method of high alloy heat-resistance stainless steel hollow billet |
| CN114289512A (en) * | 2021-12-31 | 2022-04-08 | 江苏银环精密钢管有限公司 | A method for precise feeding of U-shaped seamless pipes for high-pressure heaters |
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Open date: 20080827 |