CN115318828B - Rolling method for cold-rolled metal pipe - Google Patents
Rolling method for cold-rolled metal pipe Download PDFInfo
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- CN115318828B CN115318828B CN202211074810.2A CN202211074810A CN115318828B CN 115318828 B CN115318828 B CN 115318828B CN 202211074810 A CN202211074810 A CN 202211074810A CN 115318828 B CN115318828 B CN 115318828B
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- roller
- metal pipe
- feeding direction
- metal
- rolling
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
-
- 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
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a rolling method for cold-rolling a metal pipe, which comprises the following steps: (1) The metal tube sleeved on the core rod is driven to advance along the feeding direction, so that one end of the metal tube penetrating into the roller advances along the feeding direction for a first length and then stops, and the metal tube rotates by a first angle around the axial lead direction of the metal tube while advancing; (2) The first driving roller forwards for a first length along the feeding direction, the second driving roller backwards for a first length along the feeding direction, and the roller is used for rolling the metal pipe back and forth; (3) Driving the metal tube to rotate around the axis direction of the metal tube by a first angle, and repeating the step (2) for one time or more; (4) Repeating the step (3) for three times or more to ensure that the total angle of the metal tube passing through is more than or equal to 90 degrees; and (5) sequentially and circularly carrying out the steps (1) to (4) until the rolling of the metal pipe is completed. The rolling method for the cold-rolled metal pipe can be used for preparing the metal pipe with higher outer diameter dimensional accuracy and better tensile property.
Description
Technical Field
The present invention relates to a rolling method for cold rolling a metal tube.
Background
The existing rolling method for the titanium tube generally comprises three modes of single feeding and single rotation, single feeding and double rotation and double feeding and double rotation. In these three rolling modes, the angle of revolution of the titanium tube is limited during a single feed, and even in the case of double revolution, the second revolution is a revolution of a small angle. This results in not only a shorter interval between the two feeds of the titanium tube, but also a portion of the titanium tube which is pinched between the upper and lower rolls when rolled is less likely to be rolled into a standard arc surface. In the three rolling modes, when metal grains in the titanium tube generate plastic flow, the dislocation density is continuously increased, the deformation resistance is also continuously increased, the dispersion deformation degree of the titanium tube is lower, the uneven deformation generated in the titanium tube cannot be effectively eliminated, a large amount of residual stress is accumulated, and the prepared titanium tube has lower outer diameter dimension precision and poorer tensile property.
Disclosure of Invention
The invention aims to provide a rolling method for cold-rolling a metal pipe, which can be used for preparing a metal pipe with higher outer diameter size precision and better tensile property.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a rolling method for cold rolling a metal tube, comprising the steps of:
(1) The method comprises the steps that a metal pipe sleeved on a core rod is driven to advance along a feeding direction, one end of the metal pipe penetrating into a roller advances along the feeding direction for a first length and then stops, and the metal pipe rotates around the axial lead direction of the metal pipe by a first angle while advancing;
(2) Driving the roller to forward a first length along the feeding direction so as to roll the metal pipe, driving the roller to backward a first length along the reverse direction of the feeding direction so as to roll the metal pipe again, wherein the roller is used for pressing the metal pipe against the core rod along the circumferential direction;
(3) Driving the metal tube to rotate around the axis line direction of the metal tube by a first angle, and repeating the step (2) for one time or more;
(4) Repeating the step (3) for three or more times to ensure that the total angle of the metal tube is more than or equal to 90 degrees;
and (3) sequentially and circularly carrying out the steps (1) to (4) until the rolling of the metal pipe is completed.
Preferably, the first angle is α, wherein 30 ° is equal to or less than α is equal to or less than 50 °.
More preferably, the first angle α is 36 °.
More preferably, in step (4), step (3) is repeated a number of times less than or equal to 360 °/α, and when α is not divisible by 360 °,360 °/α is rounded up.
Preferably, the first length is d, wherein 1 mm.ltoreq.d.ltoreq.3 mm.
More preferably, the first length d is 1.7mm.
Preferably, in the step (2), the roller advances at a constant speed along the forward direction of the feeding direction and retreats at a constant speed along the reverse direction of the feeding direction, and the speed of the roller advancing at the constant speed is the same as the speed of the roller retreating at the constant speed.
Preferably, before step (1), the second length of the mandrel extending out of the roll in the forward direction of the feeding direction is greater than or equal to the first length;
the inner diameter of the metal pipe before being rolled is larger than the diameter of the roller part of the core rod extending forward in the feeding direction.
More preferably, the diameter of the portion of the mandrel that does not protrude in the forward direction of the feeding direction from the roll is smaller than or equal to the inner diameter of the metal tube before it is rolled.
Preferably, before the step (1), the mandrel is fixed, and the metal tube is sleeved on the mandrel in a coaxial line arrangement, so that the metal tube can advance forward along the feeding direction and retract backward along the feeding direction relative to the mandrel.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the rolling method for cold rolling the metal tube, provided by the invention, is used for enabling the metal tube to rotate for three times or more between two feeding intervals of the metal tube, the total rotated angle is larger than or equal to 90 degrees, and high-frequency revolution is matched for rolling, so that the part extruded between the upper roller and the lower roller can be rolled into a standard arc surface after a plurality of revolutions when the metal tube is rolled, the plastic deformation of metal grains in the metal tube is more uniform, the dispersion deformation degree is increased, the dislocation density is reduced, the deformation resistance is reduced, the residual stress accumulated in the metal tube is reduced, the outer diameter dimension precision of the manufactured metal tube is higher, the tensile property is better, and the appearance of the metal tube is more uniform and regular.
Drawings
Fig. 1 is a schematic view of a rolling structure for a rolling method of cold-rolling a metal pipe according to an embodiment of the present invention.
Wherein: 1. a roller; 2. a metal tube; 3. and (5) a core rod.
Detailed Description
The technical scheme of the invention is further described below with reference to specific embodiments and drawings.
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in numerous different ways without departing from the spirit or scope of the embodiments of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "inner", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience in describing the embodiments of the present invention and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless explicitly defined otherwise.
In the embodiments of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.
In embodiments of the invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different implementations, or examples, for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the present invention, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit embodiments of the present invention. Furthermore, embodiments of the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.
Referring to FIG. 1, the present embodiment provides a rolling method for cold rolling a metal pipe, wherein the metal pipe 2 is a titanium pipe with a length of 500mm, an outer diameter of the titanium pipe before rolling is 25mm, a wall thickness is 2mm, a target outer diameter of the titanium pipe after rolling is 15mm, and a target wall thickness is 1mm; the rolling method comprises the following steps:
(1) Fixing the core rod 3 to enable the core rod 3 to be arranged along the left-right direction, wherein the core rod 3 is made of high-strength high-pressure-resistant chromium steel, then sleeving a titanium tube on the core rod 3, arranging the two cores coaxially, enabling the right end of the core rod 3 to extend out of the roller 1 to the right to form a second length, and enabling the titanium tube to reciprocate along the left-right direction relative to the core rod 3; the two rollers 1 are arranged in the up-down direction, the diameter of the circumferential gap between the two rollers is gradually reduced when the rollers 1 of the group synchronously rotate from left to right so as to realize the forward stroke rolling of the titanium pipe, and conversely, the diameter of the circumferential gap between the two rollers is gradually increased when the rollers 1 of the group synchronously rotate from right to left so as to realize the reverse stroke rolling of the titanium pipe;
the first external driving mechanism (not shown in the figure) drives the titanium tube sleeved on the mandrel 3 to advance along the feeding direction (i.e. the left-to-right direction in fig. 1), so that one end (i.e. the right end) of the titanium tube penetrating into the roller 1 advances along the feeding direction for a first length and then stops, namely the length of the right end of the titanium tube extending out of the roller 1 to the right is the first length, the titanium tube rotates around the axis line direction of the titanium tube for a first angle while advancing, wherein the first length is smaller than or equal to the second length, and the part of the titanium tube positioned on the right side of the roller 1 can be integrally sleeved outside the mandrel 3;
the first angle is alpha, wherein 30 DEG.ltoreq.alpha.ltoreq.50 DEG, and in the present embodiment, the first angle alpha is 36 deg; the first length d, where 1 mm.ltoreq.d.ltoreq.3 mm, is 1.7mm in this embodiment;
(2) The roller 1 is driven by an external second driving mechanism (not shown in the figure) to advance forward in the feeding direction (i.e. the direction from left to right in fig. 1) for a first length to roll the titanium tube, and then the roller 1 is driven by an external second driving mechanism (not shown in the figure) to retreat backward in the feeding direction (i.e. the direction from right to left in fig. 1) for a first length to roll the titanium tube again, wherein the roller 1 is used for pressing the titanium tube against the mandrel 3 in the circumferential direction;
in the embodiment, the roller 1 advances at a constant speed along the forward direction of the feeding direction and retreats at a constant speed along the reverse direction of the feeding direction, and the speed of the roller 1 advancing at the constant speed is the same as the speed of the roller retreating at the constant speed so as to realize uniform rolling of the titanium tube;
the diameter of the section of the core rod 3 positioned at the left side of the roller 1 is smaller than or equal to the inner diameter of the section of the core rod 3 positioned at the right side of the roller 1 before the titanium pipe is rolled, so that the inner diameter of the rolled titanium pipe is the same as the diameter of the section of the core rod 3 positioned at the right side of the roller 1; in the embodiment, the diameter of a section of the core rod 3 positioned at the left side of the roller 1 is 21mm, the diameter of a section of the core rod 3 positioned at the right side of the roller 1 is 13mm, and the left section and the right section of the core rod 3 are connected through arc sections with gradually reduced diameters from left to right;
(3) Driving the titanium tube to rotate around the axis direction of the titanium tube by a first angle, and repeating the step (2) for one time or more, wherein in the embodiment, the step (2) is repeated for one time;
(4) Repeating the step (3) three or more times to make the total angle of rotation of the titanium tube greater than or equal to 90 DEG, repeating the step (3) less than or equal to 360 DEG/alpha, rounding up 360 DEG/alpha when alpha cannot be divided by 360 DEG (for example, the value of rounding up 360 DEG/alpha is 8 when alpha is 50 DEG, and the value of rounding up 360 DEG/alpha is 9 when alpha is 41 DEG); in the embodiment, the step (3) is repeated three times, so that the rotation angle of the titanium tube after stopping feeding is 108 degrees, and because a gap is inevitably formed between the upper roller 1 and the lower roller 1, the rollers 1 are subjected to high-frequency revolution matched rolling, so that the part extruded between the upper roller 1 and the lower roller 1 is rolled into a standard arc surface after a plurality of revolutions when the titanium tube is rolled, the plastic deformation of metal grains in the titanium tube is more uniform, the dispersion deformation degree is increased, the dislocation density is reduced, the deformation resistance is reduced, the residual stress accumulated in the titanium tube is reduced, the outer diameter dimension precision of the prepared titanium tube is higher, the tensile property is better, and the appearance of the titanium tube is more uniform and regular;
the steps (1) to (4) are sequentially and circularly carried out until the rolling of the titanium tube is completed, and the titanium tube is fed for 1.7mm once and 294 times because the length of the titanium tube is 500mm, and the rotation direction of the titanium tube is always the same in the step (1) and the step (2).
The following table shows the process parameters and product measurement results of rolling using single feed single revolution, single feed double revolution, double feed double revolution, and the rolling method of this embodiment, respectively, for a titanium pipe (the parameters before rolling and the target parameters after rolling are the same as in this embodiment, i.e., the titanium pipe, the mandrel 3, and the roller 1 are the same as in this embodiment, respectively) under the same conditions.
Wherein:
the single feeding and single rotation is that the titanium tube is fed for a large feeding amount for a single time, then stopped after the large feeding amount rotation angle is rotated, and the roller 1 is rolled back and forth once; repeating the above process;
the single feeding and double rotation is that the titanium tube is fed for a large feeding amount feeding distance once (simultaneously, the large feeding amount rotation angle is rotated), then the roller 1 is rolled once in the forward direction of the feeding direction, the titanium tube is rotated for a small feeding amount rotation angle again, and then the roller 1 is rolled once in the reverse direction of the feeding direction; repeating the above process;
the double feeding and double rotation are that the titanium tube is fed a large feeding distance (simultaneously rotated by a large feeding rotation angle) once and then stopped, the roller 1 is rolled once in the forward direction of the feeding direction, the titanium tube is fed a small feeding distance (simultaneously rotated by a small feeding rotation angle) and then stopped, and the roller 1 is rolled once in the reverse direction of the feeding direction; the above process is repeated.
As can be seen from the table, the titanium tube obtained by rolling through the method of the embodiment has relatively high dimensional accuracy and relatively good tensile property, and the appearance of the titanium tube is more uniform and regular.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A rolling method for cold rolling a metal tube, characterized by: the method comprises the following steps:
(1) The method comprises the steps that a metal pipe sleeved on a core rod is driven to advance along a feeding direction, one end of the metal pipe penetrating into a roller advances along the feeding direction for a first length and then stops, and the metal pipe rotates around the axial lead direction of the metal pipe by a first angle while advancing;
(2) Driving the roller to forward a first length along the feeding direction so as to roll the metal pipe, driving the roller to backward a first length along the reverse direction of the feeding direction so as to roll the metal pipe again, wherein the roller is used for pressing the metal pipe against the core rod along the circumferential direction;
(3) Driving the metal tube to rotate around the axis line direction of the metal tube by a first angle, and repeating the step (2) for one time or more;
(4) Repeating the step (3) for three or more times to ensure that the total angle of the metal tube is more than or equal to 90 degrees;
and (3) sequentially and circularly carrying out the steps (1) to (4) until the rolling of the metal pipe is completed.
2. The rolling method for cold rolled metal tubes according to claim 1, characterized in that: the first angle is alpha, wherein alpha is more than or equal to 30 degrees and less than or equal to 50 degrees.
3. The rolling method for cold rolled metal tubes according to claim 2, characterized in that: the first angle α is 36 °.
4. The rolling method for cold rolled metal tubes according to claim 2, characterized in that: in the step (4), the step (3) is repeated for a number of times less than or equal to 360 °/α, and when α is not divisible by 360 °, the 360 °/α is rounded up.
5. The rolling method for cold rolled metal tubes according to claim 1, characterized in that: the first length is d, wherein d is more than or equal to 1mm and less than or equal to 3mm.
6. The rolling method for cold-rolled metal tubes according to claim 5, wherein: the first length d is 1.7mm.
7. The rolling method for cold rolled metal tubes according to claim 1, characterized in that: in the step (2), the roller advances at a constant speed along the forward direction of the feeding direction and retreats at a constant speed along the reverse direction of the feeding direction, wherein the speed of the roller advancing at the constant speed is the same as the speed of the roller retreating at the constant speed.
8. The rolling method for cold rolled metal tubes according to claim 1, characterized in that: before the step (1), the second length of the core rod extending out of the roller in the forward direction of the feeding direction is greater than or equal to the first length;
the inner diameter of the metal pipe before being rolled is larger than the diameter of the roller part of the core rod extending forward in the feeding direction.
9. The rolling method for cold-rolled metal tubes according to claim 8, wherein: the diameter of the part of the core rod which does not extend out of the roller in the forward direction of the feeding direction is smaller than or equal to the inner diameter of the metal pipe before being rolled.
10. The rolling method for cold rolled metal tubes according to claim 1, characterized in that: before the step (1), fixing the core rod, and sleeving the metal pipe on the core rod in a way of arranging the metal pipe on the core rod in a coaxial line way, so that the metal pipe can move forward along the feeding direction and backward along the feeding direction relative to the core rod.
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| CN202211074810.2A CN115318828B (en) | 2022-09-02 | 2022-09-02 | Rolling method for cold-rolled metal pipe |
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| CN202211074810.2A CN115318828B (en) | 2022-09-02 | 2022-09-02 | Rolling method for cold-rolled metal pipe |
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| CN115318828B true CN115318828B (en) | 2023-10-27 |
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| CN116944252A (en) * | 2023-07-27 | 2023-10-27 | 众山(常州)新材料有限公司 | A two-roller cold rolling large deformation processing technology for austenitic stainless steel pipes |
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Denomination of invention: A rolling method for cold-rolled metal tubes Granted publication date: 20231027 Pledgee: Agricultural Bank of China Limited Zhangjiagang branch Pledgor: ZHANGJIAGANG HUAYU NONFERROUS METAL MATERIAL Co.,Ltd. Registration number: Y2024980029479 |
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