CN112474827B - Automatic control method for reducing fixed-point abrasion of retained mandrel - Google Patents
Automatic control method for reducing fixed-point abrasion of retained mandrel Download PDFInfo
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- CN112474827B CN112474827B CN202011169739.7A CN202011169739A CN112474827B CN 112474827 B CN112474827 B CN 112474827B CN 202011169739 A CN202011169739 A CN 202011169739A CN 112474827 B CN112474827 B CN 112474827B
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- mandrel
- pinch roll
- retained
- mandrels
- rolling mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
- B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention discloses an automatic control method for reducing fixed point abrasion of a retained mandrel, which comprises the following steps: driving n mandrels one by one through a retaining rack to move the mandrels towards the inlet of the rolling mill, wherein n is a positive integer; inserting a core rod through a tubular billet near an inlet of a rolling mill, aligning the head of the tubular billet with a tubular billet alignment baffle fork at the inlet of the rolling mill, and fixing the initial position of the contact between the tubular billet and a pinch roll when the pinch roll starts to convey the tubular billet; and the limiting rack continues to move the mandrel inserted into the capillary until the mandrel reaches a pinch roll starting position S, the pinch roll is started to clamp and transfer the capillary to the rolling mill, and the pinch roll starting position S regularly changes the position. The invention can reduce or eliminate the fixed point abrasion of the core rod by regularly changing the steel biting point and the steel throwing point of the core rod, thereby prolonging the service life of the core rod, saving the production cost and improving the production efficiency.
Description
Technical Field
The invention relates to the technical field of seamless steel pipe processing, in particular to an automatic control method for reducing fixed-point abrasion of a retained mandrel.
Background
The continuous tube rolling mill is characterized in that a hollow billet is sleeved on a long core rod and rolled into a steel tube by a continuous rolling mill with a plurality of racks arranged in sequence and roll gaps of adjacent racks staggered by 90 degrees. The continuous tube rolling mill has two types: one is that the mandrel moves freely with the tube when rolling the tube, and the continuous rolling tube can be called as a floating mandrel continuous rolling tube; the other is that the movement speed of the mandrel is limited and controllable when the tube is rolled, and the continuous rolled tube can be called a retained mandrel continuous rolled tube. The retained mandrel mill can be further divided into a retained mandrel mill and a semi-retained mandrel mill. Generally, the operation of a mandrel is controlled in the whole rolling process of a retained mandrel mill, so that the mandrel advances at a set constant speed, and after a blank pipe is separated from the mandrel by a pipe stripping machine after the rolling process is finished, the blank pipe is transferred to the next process for further processing; and returning the core rod, and cooling and lubricating the core rod for recycling after the core rod is pulled out of the rolling line.
However, the seamless tandem rolling mill, particularly the retained mandrel tandem rolling mill, has a large impact on the mandrel during the steel biting and the steel throwing. The mandrel using process in the prior art usually bites and throws steel at a fixed point of the mandrel, so that the fixed steel biting and throwing points of the mandrel are particularly easy to damage.
Accordingly, there is a need in the art for a new automatic control method for reducing retained mandrel set-point wear that eliminates or at least alleviates all or some of the above-mentioned deficiencies of the prior art.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to provide an automatic control method for reducing the fixed-point abrasion of a retained mandrel, which can automatically control the starting position of a pinch roll for transporting a hollow billet into a rolling mill, further regularly change the steel biting point and the steel throwing point of the mandrel, uniformly distribute the damage of the steel biting point and the steel throwing point to the mandrel, reduce or eliminate the fixed-point abrasion of the mandrel, prolong the service life of the mandrel, save the production cost and improve the production efficiency.
It is emphasized that, unless otherwise indicated, the terms used herein correspond to the ordinary meanings of the various technical and scientific terms in the art, the meanings of the technical terms defined in the various technical dictionaries, textbooks, etc.
To this end, according to an embodiment of the present invention, there is provided an automatic control method for reducing fixed point wear of a retained mandrel, wherein the automatic control method includes the steps of:
driving n mandrels one by one through a retaining rack so as to move the mandrels towards the inlet of the rolling mill, wherein n is a positive integer;
inserting a core rod through a tubular billet near an inlet of a rolling mill, aligning the head of the tubular billet with a tubular billet alignment baffle fork at the inlet of the rolling mill, and fixing the initial position of the contact between the tubular billet and a pinch roll when the pinch roll starts to convey the tubular billet;
and the limiting rack continues to move the mandrel inserted into the capillary until the mandrel reaches a pinch roll starting position S, the pinch roll is started to clamp and transfer the capillary to the rolling mill, and the pinch roll starting position S regularly changes the position.
Further, in an embodiment, the pinch roller start position S may regularly change position as follows:
S＝S0+A*i i＝0，1，2…(n+1)
wherein n represents the total number of on-line circulating mandrels; s0 represents a reference position of pinch roller start set by the control device; a represents the difference value between the starting positions of the pinch rolls of the previous mandril and the next mandril; and i is used for counting, wherein i is increased by 1 after each mandrel is rolled, and when i is increased to (n +1) and the rolled old mandrel is off-line, i is cleared for next cycle.
Further, in an embodiment, after each mandrel is rolled, the position of the steel throwing point corresponding to the pinch roll releasing capillary can be changed regularly, wherein the length of the section of the position change of the steel throwing point is consistent with the length of the section of the position change of the corresponding pinch roll starting position S.
Further, in an embodiment, the stop rack starts to slow down to the stop rolling speed at the stop speed conversion position until the rolling is finished, and then returns to the starting position, meanwhile, the old mandrel which finishes the rolling is conveyed to the return roller way to enter the circulating cooling process, and the new mandrel which is not rolled is moved into the stop rack clamping groove to prepare for the next rolling.
Further, the automatic control method for reducing the fixed-point wear of the retained mandrel as described in any one of the preceding embodiments is applicable to a tube rolling mill group in which a plurality of mandrels are recycled online.
Further, the automatic control method for reducing fixed-point wear of retained mandrels as described in any of the preceding embodiments may be particularly suitable for use in tandem rolling mills.
The automatic control method for reducing fixed-point abrasion of the retained mandrel provided by the embodiment of the invention has the following beneficial effects:
the invention can regularly change the steel biting point and the steel throwing point of the mandrel by automatically controlling the starting position of the pinch roll for conveying the hollow billet into the rolling mill, uniformly distribute the damage of the steel biting and the steel throwing to the mandrel, and reduce the fixed point abrasion of the mandrel, thereby prolonging the service life of the mandrel, saving the production cost and improving the production efficiency.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 schematically illustrates a flow chart of an automatic control method for reducing fixed point wear of retained mandrels according to an embodiment of the present invention;
FIG. 2 illustrates an exemplary core rod bite point profile of the automated control method for reducing retained core rod set point wear of FIG. 1.
DESCRIPTION OF SYMBOLS IN THE DRAWINGS
1: a stopper rack; 2: a core rod; 3: a capillary; 4: a pinch roll; 5: and (4) rolling.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is detailed below with reference to the accompanying drawings.
Referring to fig. 2, there is shown a multi-mandrel transporting apparatus for a retained tube rolling mill, wherein the multi-mandrel transporting apparatus includes a retained mandrel transporting unit for recycling n mandrels online, and a control device for controlling the retained mandrel transporting unit to automatically operate, wherein n is a positive integer,
wherein, retained mandrel transportation unit all includes:
a stop rack 1 for driving the movement of the mandrels one by one, having a slot for receiving and fixing the mandrels 2, to move the mandrels 2 towards the rolling mill entrance, according to the instructions of the control device;
a tubular knitting device located upstream of the inlet of the rolling mill in terms of the moving direction of the mandrel 2, comprising a tubular knitting 3 for inserting into the mandrel 2, located in the vicinity of the inlet of the rolling mill; and a tubular billet alignment baffle fork positioned at the inlet of the rolling mill and used for aligning the head of the tubular billet 3 with the tubular billet alignment baffle fork, so that when the pinch roll 4 starts to transport the tubular billet 3, the initial position of the contact between the tubular billet 3 and the pinch roll 4 is fixed.
And the pinch roll 4 is positioned at the upstream of the tubular billet alignment baffle fork and is adjacent to the tubular billet alignment baffle fork, wherein when the limiting rack 1 continues to move the mandrel 2 inserted into the tubular billet 3 until the mandrel 2 reaches a pinch roll starting position S, the pinch roll 4 is started to clamp and transfer the tubular billet 3 to the rolling mill according to the instruction of the control device, and the position of the pinch roll starting position S is regularly changed.
The capillary alignment baffle fork is used for aligning the head of the capillary 3 with the capillary alignment baffle fork, and then the head of the capillary 3 is sent into the rolling mill by a pinch roll with the capillary alignment baffle fork as a starting point.
Referring to fig. 1, according to an embodiment of the present invention, there is provided an automatic control method for reducing fixed-point wear of retained mandrels, wherein the multi-mandrel transportation method includes the steps of:
driving n mandrels 2 one by a stopper rack 1 to move the mandrels 2 towards the mill entrance, wherein n is a positive integer;
inserting a mandrel 2 through a tubular billet 3 positioned near the inlet of a rolling mill, and aligning the head of the tubular billet 3 with a tubular billet alignment retaining fork positioned at the inlet of the rolling mill, so that when a pinch roll 4 starts to convey the tubular billet 3, the initial position of the contact between the tubular billet 3 and the pinch roll 4 is fixed;
the stop rack 1 continues to move the mandrel 2 inserted into the tubular billet 3 until the mandrel 2 reaches the pinch roll start position S, which regularly changes position, the pinch roll 4 starts to grip and transfer the tubular billet 3 to the rolling mill.
Further, in an embodiment, the pinch roller start position S may regularly change position as follows:
s0+ a i i is 0, 1, 2 … (n +1) (formula 1)
Wherein n represents the total number of on-line circulating mandrels; s0 represents a reference position of pinch roller start set by the control device; a represents the difference value between the starting positions of the pinch rolls of the previous mandril and the next mandril; and i is used for counting, wherein i is increased by 1 after each mandrel is rolled, and when i is increased to (n +1) and the rolled old mandrel is off-line, i is cleared for next cycle.
Further, in an embodiment, after each mandrel 2 is rolled, the position of the steel throwing point corresponding to the pinch roll 4 for releasing the hollow billet 3 can also be changed regularly, wherein the length of the section where the position of the steel throwing point is changed is consistent with the length of the section where the starting position S of the corresponding pinch roll is changed.
Further, in an embodiment, the retained rack 1 may start to slow down to the retained rolling speed at the retained speed conversion position until the rolling is finished, and then return to the start position, and at the same time, the old mandrel that has finished rolling may be transported to the return roller table to enter the circulation cooling process, and a new mandrel that has not been rolled may be moved into the retained rack slot to prepare for the next rolling.
Further, the multi-core rod transportation method according to any one of the above embodiments is applicable to a tube rolling mill group in which a plurality of core rods are recycled online, and is particularly applicable to a tandem rolling mill group.
The technical solutions provided according to the embodiments of the present invention are further described below by way of examples.
Referring to the retained tube rolling mill set with n mandrels recycled online in fig. 2, the mandrel 2 can be placed in the clamping groove of the retained rack 1, and the retained rack 1 drives the mandrel 2 to advance towards the inlet of the rolling mill. A capillary device comprising a capillary and a capillary alignment stop, and pinch rolls may be provided adjacent the mill inlet. In the advancing process, the mandrel 2 can be firstly inserted into the tubular billet 3, and when the limiting rack 1 drives the mandrel 2 to advance until the starting position S of the pinch roll reaches the pinch roll 4, the pinch roll 4 is started to send the tubular billet 3 into the rolling mill for rolling. And then, the limiting rack 1 starts to reduce the speed to the limiting rolling speed at the limiting speed conversion position until the rolling is finished, then the starting position is returned, the upper wire revolving arm and the lower wire revolving arm of the mandrel 2 run simultaneously, the lower wire revolving arm conveys the old mandrel to a return roller way, the old mandrel enters a circulating cooling process, and the upper wire revolving arm can move the new mandrel into the limiting rack clamping groove to prepare for secondary rolling.
In the above embodiment, the pinch roller start position S may be regularly changed in position as follows:
s0+ a i i is 0, 1, 2 … (n +1) (formula 1)
Assuming that S0 is a linear distance of 1000cm from the mandrel standby home position, three mandrels 2 are cyclically used on line, numbered respectively: no. 1 core rod, No. 2 core rod and No. 3 core rod. The difference a between the bite points or pinch roll start positions S of two adjacent mandrels 2 can be defined as 50 cm.
Then, according to equation 1: s0+ a i, wherein i is increased by 1 after each mandrel is rolled, i is reset to zero for the next cycle when the old mandrel is rolled off line after i is increased to (n +1) to 4,
in the first cycle, core rod No. 1: when S0 is 1000cm, i is 0, the S value is 1000 cm;
core rod No. 2: when S0 is 1000cm, i is 1, A is 50cm, S is 1050 cm;
core rod No. 3: and S0 is 1000cm, i is 2, A is 50cm, and S is 1100 cm.
By analogy, the following results are obtained:
in the second cycle, the S values of the No. 1, No. 2, No. 3 mandrels are equal to: 1150cm, 1000cm, 1050 cm;
in the third cycle, the S values of the No. 1, No. 2, and No. 3 mandrels are equal to: 1100cm, 1150cm, 1000 cm;
in the fourth cycle, the S values of the mandrels No. 1, No. 2, and No. 3 are equal to: 1050cm, 1100cm and 1150 cm;
in the fifth cycle, the S values of core rods No. 1, No. 2, and No. 3 are equal to: 1000cm, 1050cm, 1100 cm;
……
from this, it is inferred that the theoretical pinch roll start position S or bite point circulates at four position points of 1000cm, 1150cm, 1100cm and 1050cm for each mandrel bar. Taking into account some errors, the pinch roll start positions S or steel biting points may be evenly distributed over an interval length of 150cm between 1000cm and 1150 cm. Furthermore, after the steel biting point changes, the steel throwing point of the pinch roll also changes along with the change, and the steel throwing point is uniformly distributed in the other 150cm interval length of the core rod.
The distribution of the mandrel bite points in the above embodiment can be seen in fig. 2.
In summary, the automatic control method for reducing the fixed-point abrasion of the retained mandrel according to the embodiment of the invention is not only applicable to a continuous tube rolling unit, but also applicable to a tube rolling unit in which a plurality of mandrels are recycled online, so that the mandrel biting and throwing points are uniformly distributed by the method, the fixed-point abrasion of the mandrel is reduced, and the service life of the mandrel is prolonged.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. An automatic control method for reducing fixed point abrasion of a retained mandrel, which is characterized by comprising the following steps:
driving n mandrels one by one through a retaining rack to move the mandrels towards the inlet of the rolling mill, wherein n is a positive integer;
inserting a core rod through a tubular billet near an inlet of a rolling mill, and aligning the head of the tubular billet with a tubular billet alignment retaining fork at the inlet of the rolling mill, so that the initial position of the tubular billet in contact with a pinch roll is fixed when the pinch roll starts to convey the tubular billet;
the limiting rack continues to move the mandrel inserted into the capillary until the mandrel reaches a pinch roll starting position S, the pinch roll is started to clamp and transfer the capillary to the rolling mill, wherein the pinch roll starting position S regularly changes the position in the following way:
S＝S0+A*i，i＝0，1，2…(n+1)
wherein n represents the total number of on-line circulating mandrels; s0 represents a reference position of pinch roller start set by the control device; a represents the difference value between the starting positions of the pinch rolls of the previous mandril and the next mandril; and i is used for counting, wherein i is increased by 1 after each mandrel is rolled, and when the rolled old mandrel is off-line after i is increased to (n +1), i is cleared for the next cycle.
2. The automatic control method for reducing the fixed-point wear of retained mandrels as recited in claim 1, wherein after each mandrel is rolled, the position of the steel throwing point corresponding to the position of the pinch roll releasing the hollow billet is regularly changed, and wherein the length of the section where the position of the steel throwing point is changed is consistent with the length of the section where the starting position S of the corresponding pinch roll is changed.
3. The automatic control method for reducing the fixed-point wear of the retained mandrel as claimed in claim 2, wherein the retained rack starts to slow down to the retained rolling speed at the retained speed conversion position until the rolling is finished, and then returns to the start position, and at the same time, the old mandrel which has finished being rolled is conveyed to the return roller table to enter the circulating cooling process, and the new mandrel which has not been rolled is moved into the retained rack slot to prepare for the next rolling.
4. An automatic control method for reducing the fixed-point wear of retained mandrels as in any of claims 1 to 3, characterized in that it is suitable for tube rolling mills in which a plurality of mandrels are recycled on line.
5. An automatic control method for reducing the fixed-point wear of retained mandrels as in claim 4, adapted for use in a continuous tube rolling mill train.
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| CN202011169739.7A CN112474827B (en) | 2020-10-28 | 2020-10-28 | Automatic control method for reducing fixed-point abrasion of retained mandrel |
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