CN113020315A - Method for manufacturing thin-wall chilled special pipe - Google Patents
Method for manufacturing thin-wall chilled special pipe Download PDFInfo
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- CN113020315A CN113020315A CN202110251324.2A CN202110251324A CN113020315A CN 113020315 A CN113020315 A CN 113020315A CN 202110251324 A CN202110251324 A CN 202110251324A CN 113020315 A CN113020315 A CN 113020315A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/155—Making tubes with non circular section
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Abstract
The invention discloses a method for manufacturing a thin-wall chilled special pipe, which comprises the steps of adjusting and changing parameters of raw materials entering a forming die according to the hardness and the thickness of the raw materials, increasing the thickness of a forming closed hole type guide sheet, controlling the size of an opening angle of small guide and properly widening the width of the raw materials. By the mode, the manufacturing method of the thin-wall chilled special pipe solves the problem that four corners of a welding line are easy to crack, so that the surface of the welding line of the special pipe is smoother, and the yield is greatly improved.
Description
Technical Field
The invention relates to the field of seamless steel pipes, in particular to a manufacturing method of a thin-wall chilled special pipe.
Background
The special-shaped pipes are seamless steel pipes of various shapes which are manufactured by cold drawing, are generally distinguished according to the section, and can be divided into seamless steel pipe special-shaped pipes, aluminum alloy special-shaped pipes and plastic special-shaped pipes according to materials.
The irregular seamless steel pipe is a generic name of seamless steel pipes having other cross-sectional shapes than a circular pipe, and is classified into an equal-wall-thickness irregular seamless steel pipe (reference numeral D), an unequal-wall-thickness irregular seamless steel pipe (reference numeral BD), and a variable-diameter irregular seamless steel pipe (reference numeral BJ) according to the cross-sectional shape and size of the steel pipe.
The special-shaped seamless steel tube is widely used for various structural members, tools and mechanical parts, and compared with a round tube, the special-shaped seamless steel tube generally has larger inertia moment and section modulus and larger bending resistance and torsion resistance, can greatly reduce the structural weight and save steel.
In the manufacturing process of the special-shaped pipe, four corners of a welding seam of the special-shaped pipe are easy to crack, so that the surface of the welding seam is uneven, and the yield of the special-shaped pipe is low.
Disclosure of Invention
The invention mainly solves the technical problem of providing a method for manufacturing a thin-wall chilled special pipe, which can improve the yield.
In order to solve the technical problems, the invention adopts a technical scheme that: a technology for manufacturing the thin-wall cold-hardened shaped tube includes such steps as regulating and changing the parameters of raw material when it is fed into mould, increasing the thickness of guide plate, controlling the opening angle of small guide, and widening the width of raw material.
In a preferred embodiment of the present invention, the method comprises the following steps:
1) raw material analysis: selecting raw materials which are properly widened compared with the traditional raw materials, putting the widened raw materials into a storage bin through a feeding frame, and analyzing the hardness and the thickness of the widened raw materials so as to adjust and change parameters of the widened raw materials when the widened raw materials enter a forming die;
2) preparing a round pipe: according to the parameters of the widened raw material in the step 1) when entering a forming die, performing forming opening, forming closing, small guiding and extrusion welding on the widened raw material in the storage bin to prepare a round pipe, wherein the hole shape is enlarged when the widened raw material enters the forming closing after entering the forming opening, the guide sheet is thickened, the reduction coefficient is increased during the extrusion welding, and the opening angle during the small guiding is controlled;
3) preparing a special pipe: according to the shape of the required special pipe, the round pipe formed in the step 2) is manufactured into the special pipe after sizing, finishing and straightening;
4) warehousing: and (3) cutting the square pipe formed in the step 3), and conveying the cut square pipe into a warehouse.
In a preferred embodiment of the present invention, the hardness and thickness of the widened raw material in the step 1) are a thin-wall cold-hardened thickness and a rockwell hardness.
In a preferred embodiment of the present invention, the parameters of the widened raw material entering the forming die in the step 1) are a plastic rebound coefficient and a yield coefficient.
In a preferred embodiment of the present invention, the thickness of the guide piece is 14 to 16 mm.
In a preferred embodiment of the present invention, the rolling reduction coefficient is 1.2 to 1.4 mm.
In a preferred embodiment of the present invention, the opening angle is 26 ° -30 °.
In a preferred embodiment of the invention, the sizing is performed by applying force in a segmented manner.
In a preferred embodiment of the invention, the segmented stress is to reduce the stress of the front three flat rolls and the front three vertical rolls and increase the stress of the rear three flat rolls and the rear three vertical rolls.
In a preferred embodiment of the present invention, the temperature is controlled according to the properties of the material during the extrusion welding in the step 2).
The invention has the beneficial effects that: the method for manufacturing the thin-wall chilled special pipe solves the problem that four corners of a welding line are easy to crack, so that the surface of the welding line of the special pipe is smoother, and the yield is greatly improved.
Drawings
Fig. 1 is a flow chart of a method for manufacturing a thin-wall chilled profiled pipe.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Please refer to FIG. 1
Example 1
When manufacturing the special-shaped pipe with the wall thickness of 0.8mm
A method for manufacturing thin-wall cold-hardened special-shaped tube includes such steps as regulating and changing the plastic rebound coefficient and yield coefficient of raw material when it is fed into mould, increasing the thickness of guide plate, controlling the opening angle of small guide and widening the width of raw material.
The method comprises the following specific steps:
1) raw material analysis: the raw materials are properly widened compared with the traditional raw materials, so as to ensure normal forming, welding and sizing.
And putting the widened raw material into a storage bin through a feeding frame, and analyzing the hardness and the thickness of the widened raw material, so that the parameters of the widened raw material entering a forming die are adjusted and changed, and the welding coefficient is ensured to be enough for sizing adjustment allowance.
2) Preparing a round pipe: according to the parameters of the widened raw material in the step 1) when entering the forming die, carrying out forming opening, forming closing, small guiding and extrusion welding on the widened raw material in the storage bin to prepare a round pipe, wherein the hole shape is enlarged and the guide sheet is thickened when the widened raw material enters the forming closing after entering the forming opening, the reduction coefficient is increased during the extrusion welding, and the opening angle during the small guiding is controlled,
the forming open hole type die is characterized in that upper and lower flat rolls with the thickness of 0.8mm are matched, the hole type is enlarged when the die enters large guide, a guide sheet is thickened, the thickness of the guide sheet is increased from the original 8mm to 14mm, meanwhile, the reduction coefficient is controlled during extrusion welding, no wave is generated, the influence on welding is avoided, the reduction coefficient is increased from the conventional 0.5mm to 1.2mm, the opening angle during small guide is controlled, and the opening angle is changed from the original 15-18 degrees to 26 degrees according to the characteristics of thin-walled tubes, so that the weld quality is enhanced, the length of a pre-welding interval is shortened, and the welding burn-through phenomenon is avoided.
And controlling the temperature according to the properties of the material during extrusion welding, so as to ensure that four corners of the welding line of the circular tube are not cracked.
3) Preparing a special pipe: according to the shape of the required special pipe, the round pipe formed in the step 2) is subjected to sizing, finishing and straightening to form the special pipe, the stress is uniformly distributed by six flat rollers and six vertical rollers in the traditional sizing and finishing, the sectional stress is adopted in the sizing and finishing aiming at the characteristic of the thin-wall pipe, the sectional stress is used for reducing the stress of the front three flat rollers and the front three vertical rollers, the stress of the rear three flat rollers and the rear three vertical rollers is increased, the flatness of the pipe type plane is ensured, the phenomenon of overlarge unevenness is avoided, and the four corners are uniform.
4) Warehousing: and (3) cutting the square pipe formed in the step 3), and conveying the cut square pipe into a warehouse.
Example 2
When manufacturing the special-shaped pipe with the wall thickness of 0.9mm
A method for manufacturing thin-wall cold-hardened special-shaped tube includes such steps as regulating and changing the plastic rebound coefficient and yield coefficient of raw material when it is fed into mould, increasing the thickness of guide plate, controlling the opening angle of small guide and widening the width of raw material.
The method comprises the following specific steps:
1) raw material analysis: the raw materials are properly widened compared with the traditional raw materials, so as to ensure normal forming, welding and sizing.
And putting the widened raw material into a storage bin through a feeding frame, and analyzing the hardness and the thickness of the widened raw material, so that the parameters of the widened raw material entering a forming die are adjusted and changed, and the welding coefficient is ensured to be enough for sizing adjustment allowance.
2) Preparing a round pipe: according to the parameters of the widened raw material in the step 1) when entering the forming die, carrying out forming opening, forming closing, small guiding and extrusion welding on the widened raw material in the storage bin to prepare a round pipe, wherein the hole shape is enlarged and the guide sheet is thickened when the widened raw material enters the forming closing after entering the forming opening, the reduction coefficient is increased during the extrusion welding, and the opening angle during the small guiding is controlled,
the forming open hole type die is characterized in that upper and lower flat rolls with the thickness of 0.9mm are matched, the hole type is enlarged when the die enters large guide, a guide sheet is thickened, the thickness of the guide sheet is increased from original 8mm to 15mm, meanwhile, the reduction coefficient is controlled during extrusion welding, no wave is generated, the influence on welding is avoided, the reduction coefficient is increased from conventional 0.5mm to 1.3mm, the opening angle during small guide is controlled, and the opening angle is changed from original 15-18 degrees to 28 degrees according to the characteristics of thin-walled tubes, so that the weld quality is enhanced, the length of a pre-welding interval is shortened, and the welding burnthrough phenomenon is avoided.
And controlling the temperature according to the properties of the material during extrusion welding, so as to ensure that four corners of the welding line of the circular tube are not cracked.
3) Preparing a special pipe: according to the shape of the required special pipe, the round pipe formed in the step 2) is subjected to sizing, finishing and straightening to form the special pipe, the stress is uniformly distributed by six flat rollers and six vertical rollers in the traditional sizing and finishing, the sectional stress is adopted in the sizing and finishing aiming at the characteristic of the thin-wall pipe, the sectional stress is used for reducing the stress of the front three flat rollers and the front three vertical rollers, the stress of the rear three flat rollers and the rear three vertical rollers is increased, the flatness of the pipe type plane is ensured, the phenomenon of overlarge unevenness is avoided, and the four corners are uniform.
4) Warehousing: and (3) cutting the square pipe formed in the step 3), and conveying the cut square pipe into a warehouse.
Example 3
When manufacturing special-shaped tubes with wall thickness of 1mm
A method for manufacturing thin-wall cold-hardened special-shaped tube includes such steps as regulating and changing the plastic rebound coefficient and yield coefficient of raw material when it is fed into mould, increasing the thickness of guide plate, controlling the opening angle of small guide and widening the width of raw material.
The method comprises the following specific steps:
1) raw material analysis: the raw materials are properly widened compared with the traditional raw materials, so as to ensure normal forming, welding and sizing.
And putting the widened raw material into a storage bin through a feeding frame, and analyzing the hardness and the thickness of the widened raw material, so that the parameters of the widened raw material entering a forming die are adjusted and changed, and the welding coefficient is ensured to be enough for sizing adjustment allowance.
2) Preparing a round pipe: according to the parameters of the widened raw material in the step 1) when entering the forming die, carrying out forming opening, forming closing, small guiding and extrusion welding on the widened raw material in the storage bin to prepare a round pipe, wherein the hole shape is enlarged and the guide sheet is thickened when the widened raw material enters the forming closing after entering the forming opening, the reduction coefficient is increased during the extrusion welding, and the opening angle during the small guiding is controlled,
the forming open hole type die is characterized in that upper and lower special flat rolls with the thickness of 1mm are matched, the hole type is enlarged when the die enters large guide, a guide sheet is thickened, the thickness of the guide sheet is increased from original 8mm to 16mm, meanwhile, the reduction coefficient is controlled during extrusion welding, no wave is generated, the influence on welding is avoided, the reduction coefficient is increased from conventional 0.5mm to 1.4mm, the opening angle during small guide is controlled, and the opening angle is changed from original 15-18 degrees to 30 degrees according to the characteristics of a thin-walled tube, so that the quality of a welding seam is enhanced, the length of a prewelding interval is shortened, and the welding burn-through phenomenon is avoided.
And controlling the temperature according to the properties of the material during extrusion welding, so as to ensure that four corners of the welding line of the circular tube are not cracked.
3) Preparing a special pipe: according to the shape of the required special pipe, the round pipe formed in the step 2) is subjected to sizing, finishing and straightening to form the special pipe, the stress is uniformly distributed by six flat rollers and six vertical rollers in the traditional sizing and finishing, the sectional stress is adopted in the sizing and finishing aiming at the characteristic of the thin-wall pipe, the sectional stress is used for reducing the stress of the front three flat rollers and the front three vertical rollers, the stress of the rear three flat rollers and the rear three vertical rollers is increased, the flatness of the pipe type plane is ensured, the phenomenon of overlarge unevenness is avoided, and the four corners are uniform.
4) Warehousing: and (3) cutting the square pipe formed in the step 3), and conveying the cut square pipe into a warehouse.
Compared with the prior art, the method for manufacturing the thin-wall chilled special pipe solves the problem that four corners of a welding line are easy to crack, so that the surface of the welding line of the special pipe is smoother, the finished product rate is greatly improved, and the processing efficiency is improved by 20 percent before improvement.
In the description of the present invention, it should be noted that all the components are general standard components or components known to those skilled in the art, the structure and principle of the components can be known by technical manuals or by conventional test methods, and the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate the orientations or positional relationships based on the drawings or the orientations or positional relationships usually placed when the product of the present invention is used, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or the component referred to must have a specific orientation, be configured and operated in a specific orientation, and thus cannot be understood as limiting the present invention.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for manufacturing thin-wall cold-hardened special-shaped tube includes such steps as regulating and changing the parameters of raw material when it is fed into mould, increasing the thickness of guide plate, controlling the opening angle of small guide and widening the width of raw material.
2. A method for manufacturing a thin-walled chilled profiled tube according to claim 1, comprising the following specific steps:
1) raw material analysis: selecting raw materials which are properly widened compared with the traditional raw materials, putting the widened raw materials into a storage bin through a feeding frame, and analyzing the hardness and the thickness of the widened raw materials so as to adjust and change parameters of the widened raw materials when the widened raw materials enter a forming die;
2) preparing a round pipe: according to the parameters of the widened raw material in the step 1) when entering a forming die, performing forming opening, forming closing, small guiding and extrusion welding on the widened raw material in the storage bin to prepare a round pipe, wherein the hole shape is enlarged when the widened raw material enters the forming closing after entering the forming opening, the guide sheet is thickened, the reduction coefficient is increased during the extrusion welding, and the opening angle during the small guiding is controlled;
3) preparing a special pipe: according to the shape of the required special pipe, the round pipe formed in the step 2) is manufactured into the special pipe after sizing, finishing and straightening;
4) warehousing: and (3) cutting the square pipe formed in the step 3), and conveying the cut square pipe into a warehouse.
3. The method for manufacturing a thin-walled large-caliber square tube according to claim 2, wherein the hardness and thickness of the raw material widened in the step 1) are a thin-walled cold-hardened thickness and a rockwell hardness.
4. The method for manufacturing a thin-walled large-caliber square tube according to claim 2, wherein the parameters of the raw material widened in the step 1) entering the forming die are a plastic rebound coefficient and a yield coefficient.
5. The method for manufacturing a thin-walled large-caliber square tube according to claim 2, wherein the thickness of the guide piece is 14 to 16 mm.
6. The method for manufacturing a thin-walled large-diameter square pipe according to claim 2, wherein the reduction coefficient is 1.2 to 1.4 mm.
7. The method of manufacturing a thin-walled large-caliber square tube according to claim 2, wherein the opening angle is 26 ° to 30 °.
8. The method according to claim 2, wherein the sizing is performed by applying force in stages.
9. The method for manufacturing the thin-wall large-caliber square tube according to claim 8, wherein the segmented stress is that the stress of the front three flat rolls and the front three vertical rolls is reduced, and the stress of the rear three flat rolls and the rear three vertical rolls is increased.
10. The method for manufacturing a thin-walled large-caliber square pipe according to claim 2, wherein the temperature is controlled according to the properties of the material during the extrusion welding in the step 2).
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| CN202110251324.2A CN113020315B (en) | 2021-03-08 | 2021-03-08 | Method for manufacturing thin-wall chilled special pipe |
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| CN103302135A (en) * | 2013-06-20 | 2013-09-18 | 江苏丰立精密制管有限公司 | Manufacture method of high-intensity welded special pipe |
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| CN205289309U (en) * | 2016-01-26 | 2016-06-08 | 安钢集团华德重工装备有限公司 | High strength side's pipe production line |
| CN111230408A (en) * | 2019-12-31 | 2020-06-05 | 江苏瑞强能源有限公司 | Continuous forming preparation method and system for anti-blocking block |
-
2021
- 2021-03-08 CN CN202110251324.2A patent/CN113020315B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103302135A (en) * | 2013-06-20 | 2013-09-18 | 江苏丰立精密制管有限公司 | Manufacture method of high-intensity welded special pipe |
| CN103785706A (en) * | 2014-02-12 | 2014-05-14 | 攀钢集团江油长城特殊钢有限公司 | Manufacturing method of alloy steel section tubes |
| CN105364426A (en) * | 2015-12-17 | 2016-03-02 | 江苏省常熟环通实业有限公司 | Method for preparing thick-wall high-frequency welded steel tube |
| CN205289309U (en) * | 2016-01-26 | 2016-06-08 | 安钢集团华德重工装备有限公司 | High strength side's pipe production line |
| CN111230408A (en) * | 2019-12-31 | 2020-06-05 | 江苏瑞强能源有限公司 | Continuous forming preparation method and system for anti-blocking block |
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