CN109759479B - Rib pressing process for square high-strength metal pipe - Google Patents
Rib pressing process for square high-strength metal pipe Download PDFInfo
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- CN109759479B CN109759479B CN201811628975.3A CN201811628975A CN109759479B CN 109759479 B CN109759479 B CN 109759479B CN 201811628975 A CN201811628975 A CN 201811628975A CN 109759479 B CN109759479 B CN 109759479B
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Abstract
The invention discloses a rib pressing process for a square high-strength metal pipe, which comprises the following steps: 1) rolling up and down: the upper side surface and the lower side surface of the rectangular metal pipe are extruded and deformed in the rolling process of an upper wheel die and a lower wheel die, so that the outer end surfaces of the upper side and the lower side are inwards concave; 2) rolling left and right: the left side surface and the right side surface of the rectangular metal coffin are extruded and deformed in the rolling process of a left wheel die and a right wheel die, so that the outer end surfaces of the left side and the right side are inwards concave; the upper rolling and the lower rolling and the left rolling and the right rolling are processed at two different stations on the same equipment, and the axes of the two stations are overlapped; the breakage rate of the upright column produced by the process equipment is reduced to 0.7 percent from 8 percent before modification. Greatly improving the market competitiveness and the public praise of customers.
Description
Technical Field
The invention relates to a pipe beading device, in particular to a beading process for a square high-strength metal pipe.
Background
In the process of development, production and use (customers) of the outdoor tent, the surfaces of the upright post parts can be gouged in different degrees, and pits are deformed. The strength of the whole stand column is obviously poor, the use of customers is seriously influenced, and great influence is brought to the product sale of the customers. Therefore, the physical structure of the surface metal material of the upright tube is changed to improve the surface strength, hardness and mechanical property of the tube.
Disclosure of Invention
Aiming at the technical problem, the invention provides a rib pressing process for a square high-strength metal pipe, wherein a transverse extrusion mechanism and a longitudinal extrusion structure are arranged at intervals in a certain linear direction, the square pipe is extruded by the extrusion structure to complete rib pressing, the metal hardness of the surface of the pipe is improved by equipment through cold work hardening (from the original HRA65 to HRA 75), the metal layer on the surface is denser by the rib pressing treatment of the equipment, the surface hardness of a metal material is also improved, the surface pressure resistance of the whole square pipe surface is improved, and the breakage rate of an upright column produced by the equipment is reduced to 0.7 percent of the current breakage rate from 8 percent before modification. Greatly improving the market competitiveness and the public praise of customers.
In order to solve the technical problems, the invention adopts a technical scheme that: the rib pressing process for the square high-strength metal pipe comprises the following steps:
1) rolling up and down: the upper side surface and the lower side surface of the square metal pipe are extruded and deformed in the rolling process of an upper wheel die and a lower wheel die, so that the outer end surfaces of the upper side and the lower side are inwards concave;
2) rolling left and right: the left side surface and the right side surface of the square metal coffin are extruded and deformed in the rolling process of a left wheel die and a right wheel die, so that the outer end surfaces of the left side and the right side are inwards concave;
the upper rolling and the lower rolling and the left rolling and the right rolling are processed at two different stations on the same equipment, and the axes of the two stations are overlapped;
the apparatus comprises:
a work table;
the longitudinal extrusion structure is arranged on the working table surface and comprises two longitudinal wheel dies with parallel axes and sharing a first vertical surface, a first channel is arranged between the two longitudinal wheel dies, the two ends of the structure of the longitudinal wheel dies are symmetrical, each longitudinal wheel die comprises a cylindrical central roller, the two ends of each cylindrical central roller are provided with a circular truncated cone-shaped roller, the end part of each circular truncated cone-shaped roller is provided with a cylindrical frame, the outer end surface of each cylindrical frame is provided with a fixed shaft, the diameter of the connecting section of each circular truncated cone-shaped roller and each cylindrical frame is smaller than that of each cylindrical central roller, and the diameter of each cylindrical frame is larger than that of each cylindrical central roller;
the transverse extrusion structure is arranged on a working table surface and comprises two transverse wheel dies with parallel axes and a second vertical surface, a second channel is arranged between the two transverse wheel dies, the transverse extrusion mechanism comprises a third support, a fourth support and a guide rail, the third support and the fourth support are arranged in parallel, the guide rail is fixed on the working table surface, the third support and the fourth support are arranged on the guide rail and are fixedly matched with the guide rail in the sliding width direction in the length direction of the guide rail, the third support and the fourth support are symmetrical in structure, an upper fixing plate and a lower fixing plate are arranged on opposite surfaces of fixing plates oppositely arranged on the third support and the fourth support, the transverse wheel dies are arranged between the upper fixing plate and the lower fixing plate, two ends of each transverse wheel die are fixedly connected with the upper fixing plate and the lower fixing plate, each transverse wheel die comprises a wheel body and a connecting shaft arranged at two ends of the wheel body, the connecting shaft and the wheel body are axially fixed and radially rotationally matched, the wheel body is of a symmetrical structure at two ends, the wheel body comprises a cylindrical wheel body positioned at the center, round platform-shaped wheel bodies arranged at two ends of the cylindrical wheel body and a cylindrical frame wheel body arranged at the end part of the round platform-shaped wheel body, the diameter of one end, in contact with the cylindrical frame wheel body, of the round platform-shaped wheel body is smaller than that of the cylindrical wheel body, the diameter of the cylindrical frame wheel body is larger than that of the cylindrical wheel body, the fixing rod comprises thread sections positioned at two ends of the fixing rod and a smooth section between the two thread sections, a through hole is axially formed in the transverse wheel die, the fixing rod penetrates through the through hole, the thread sections are provided with nuts, the connecting shafts at two ends of the longitudinal wheel die are in contact fit with the lower, The fixing rod, the lower fixing plate and the connecting shaft are arranged on the connecting rod;
the longitudinal extrusion structure and the transverse extrusion structure are arranged on the working table at intervals in a certain direction, and the axes of the first channel and the second channel are overlapped;
at least one of the two longitudinal wheel dies and the two transverse wheel dies of the longitudinal extrusion structure and the transverse extrusion structure is driven by a power mechanism to rotate around the axis of the power mechanism.
On the basis of the above scheme, preferably, the longitudinal extrusion mechanism comprises a first support and a second support which are arranged in parallel, one end of the longitudinal wheel mold is in rotation fit with the first support by taking the axis of the longitudinal wheel mold as a center, and the other end of the longitudinal wheel mold is in rotation fit with the first support by taking the axis of the longitudinal wheel mold as a center.
On the basis of the above scheme, as preferred, first support includes first support A, first support B, the second support includes second support A, second support B, in two vertical wheel moulds, the one end of a vertical wheel mould is rotated and is connected first support A, the other end is rotated and is connected first support B, another vertical wheel mould one end is rotated and is connected second support A, second support B is connected to the other end, first support A is fixed on table surface, transversely fixed vertical sliding fit between first support B and the first support A, second support A is fixed on table surface, transversely fixed vertical sliding fit between second support B and the second support A.
On the basis of the scheme, preferably, at least one longitudinal adjusting bracket is fixed on the first bracket A and is provided with a longitudinal threaded hole;
the steering wheel is fixed with a longitudinal threaded column, the longitudinal threaded column is matched with the longitudinal threaded hole, and the longitudinal threaded column penetrates through the longitudinal threaded hole to be rotatably connected with the second support A.
On the basis of the above scheme, preferably, the power mechanism comprises a power source and a power rotating shaft driven by the power source, and the power rotating shaft is fixedly connected to a fixed shaft of the longitudinal wheel mold mounted on the first support.
On the basis of the scheme, preferably, at least one transverse adjusting bracket is fixed on the working table top, and a threaded hole is formed in the transverse adjusting bracket; the steering wheel is fixed with a threaded column, the threaded column is matched with the threaded hole, and the threaded column penetrates through the threaded hole to be rotatably connected with the third support.
On the basis of the scheme, preferably, two guide mechanisms are further arranged in the axial direction of the first channel and the second channel, each guide mechanism comprises a guide support and a roller in rolling fit with the guide support, the transverse horizontal section of each roller is coplanar with the horizontal section of the longitudinal wheel die below, the axial direction of each roller is parallel to the axial direction of the longitudinal wheel die, and in the axial direction of the first channel and the second channel, one of the two guide mechanisms is positioned on one side of the transverse extrusion structure far away from the longitudinal extrusion structure, and the other guide mechanism is positioned on one side of the longitudinal extrusion structure far away from the transverse extrusion structure.
The invention has the beneficial effects that: the transverse extrusion mechanism and the longitudinal extrusion structure are arranged at intervals in a certain linear direction, the square pipe is extruded by the extrusion structure to complete ribbing, the metal hardness of the surface of the pipe is improved by the equipment through cold work hardening (from the original HRA65 to the HRA 75), the metal layer on the surface is more compact by the ribbing treatment of the equipment, the surface hardness of the metal material is also improved, the surface pressure resistance of the whole square pipe surface is improved, and the breakage rate of the upright column produced by the equipment is reduced to 0.7 percent of the current breakage rate from 8 percent before modification. Greatly improving the market competitiveness and the public praise of customers.
Drawings
FIG. 1 is a first perspective view of the present invention;
FIG. 2 is a second perspective view of the present invention;
fig. 3 is a perspective view three of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
It is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the description of the invention to indicate orientations and positional relationships relative to each other as indicated in the drawings, and are used merely for convenience in describing and simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, terms appearing as "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in the figures 1-3 of the drawings,
a rib pressing process for a square high-strength metal pipe,
the rib pressing process comprises the following steps:
1) rolling up and down: the upper side surface and the lower side surface of the square metal pipe are extruded and deformed in the rolling process of an upper wheel die and a lower wheel die, so that the outer end surfaces of the upper side and the lower side are inwards concave;
2) rolling left and right: the left side surface and the right side surface of the square metal coffin are extruded and deformed in the rolling process of a left wheel die and a right wheel die, so that the outer end surfaces of the left side and the right side are inwards concave;
the upper rolling and the lower rolling and the left rolling and the right rolling are processed at two different stations on the same equipment, and the axes of the two stations are overlapped;
the apparatus comprises:
a working table top 1;
the longitudinal extrusion structure is arranged on the working table surface and comprises two longitudinal wheel dies with parallel axes and sharing a first vertical surface, a first channel 2 is arranged between the two longitudinal wheel dies, the two ends of the structure of the longitudinal wheel dies are symmetrical, each longitudinal wheel die comprises a cylindrical central roller 4, round table-shaped rollers 5 are arranged at the two ends of each cylindrical central roller, a cylindrical frame 6 is arranged at the end part of each round table-shaped roller, a fixed shaft 7 is arranged on the outer end surface of each cylindrical frame, the diameter of the connecting section of each round table-shaped roller and each cylindrical frame is smaller than that of each cylindrical central roller, and the diameter of each cylindrical frame is larger than that of each cylindrical central roller;
the transverse extrusion structure is arranged on a working table surface and comprises two transverse wheel dies with parallel axes and a second vertical surface, a second channel 3 is arranged between the two transverse wheel dies, the transverse extrusion structure comprises a third support 8 and a fourth support 9 which are arranged in parallel and a guide rail 10 fixed on the working table surface, the third support and the fourth support are arranged on the guide rail and are fixedly matched with the guide rail in the sliding width direction in the length direction of the guide rail, the third support and the fourth support are symmetrical in structure, an upper fixing plate 11 and a lower fixing plate 12 are arranged on opposite surfaces of fixing plates arranged on the third support and the fourth support, the transverse wheel dies are arranged between the upper fixing plate and the lower fixing plate, two ends of the transverse wheel dies are fixedly connected with the upper fixing plate and the lower fixing plate, each transverse wheel die comprises a wheel body and a connecting shaft 14 arranged at two ends of the wheel body, the connecting shaft and the wheel body are axially fixed and radially rotationally matched, the wheel body is of a symmetrical structure at two ends, the wheel body comprises a cylindrical wheel body 13 positioned at the center, truncated cone-shaped wheel bodies 15 arranged at two ends of the cylindrical wheel body and a cylindrical frame wheel body 16 arranged at the end part of the truncated cone-shaped wheel body, the diameter of one end, contacting with the cylindrical frame wheel body, of the truncated cone-shaped wheel body is smaller than that of the cylindrical wheel body, the cylindrical frame wheel body is larger than that of the cylindrical wheel body, a fixing rod 17 comprises thread sections positioned at two ends of the fixing rod and a smooth section between the two thread sections, a through hole is axially arranged on the transverse wheel mold, the fixing rod penetrates through the through hole, the thread sections are provided with nuts 18, the connecting shafts at two ends of the longitudinal wheel mold are in contact fit with the lower end face of the corresponding, The fixing rod, the lower fixing plate and the connecting shaft are arranged on the connecting rod;
the longitudinal extrusion structure and the transverse extrusion structure are arranged on the working table at intervals in a certain direction, and the axes of the first channel and the second channel are overlapped;
at least one of the two longitudinal wheel dies and the two transverse wheel dies of the longitudinal extrusion structure and the transverse extrusion structure is driven by a power mechanism to rotate around the axis of the power mechanism.
In the scheme, the equipment improves the metal hardness of the surface of the pipe through cold work hardening, and the detection shows that the equipment can improve the metal hardness from the original HRA65 to HRA75, so that the metal layer on the surface is more compact by carrying out the beading treatment through the equipment, the surface hardness of the metal material is increased, and the surface pressure resistance of the whole square pipe surface is improved.
In the above scheme, the upper angle of the isosceles trapezoid formed by the cross section of the truncated cone-shaped cylinder is between 150 degrees and 180 degrees, and can be 160 degrees, 166 degrees, 170 degrees, and the like.
In the scheme, a square tube with the size of 80mm by 80mm is taken as an example, after rib pressing treatment, the tube is compressed to 78mm by 78mm from the original size of 80mm by 80mm, and the slope at 166 degrees of the surface is changed, so that the whole surface is not in a horizontal plane, a height difference is formed, and the surface pressure resistance of the whole square tube surface is improved.
The column produced by the process and the equipment has the breakage rate reduced from 8 percent before modification to 0.7 percent at present. Greatly improving the market competitiveness and the public praise of customers.
The longitudinal extrusion mechanism comprises a first support 19 and a second support 20 which are arranged in parallel, one end of the longitudinal wheel mold is in rotation fit with the first support by taking the axis of the longitudinal wheel mold as a center, and the other end of the longitudinal wheel mold is in rotation fit with the first support by taking the axis of the longitudinal wheel mold as a center.
Wherein, first support includes first support A191, first support B192, the second support includes second support A201, second support B202, in two vertical round of moulds, the one end of a vertical round of mould is rotated and is connected first support A, the other end is rotated and is connected first support B, another vertical round of mould one end is rotated and is connected second support A, second support B is connected to the other end, first support A fixes on table surface, horizontal fixed vertical sliding fit between first support B and the first support A, second support A fixes on table surface, horizontal fixed vertical sliding fit between second support B and the second support A.
Among the first bracket A and the first bracket B, at least one longitudinal adjusting bracket 21 is fixed on the first bracket A, and a longitudinal threaded hole is formed in the longitudinal adjusting bracket;
the longitudinal adjusting steering wheel 22 is further included, a longitudinal threaded column 23 is fixed on the longitudinal adjusting steering wheel and matched with the longitudinal threaded hole, the longitudinal threaded column penetrates through the longitudinal threaded hole to be rotatably connected (the threaded column is axially, rotatably and radially fixed) with the second support A, and through the scheme, when the device is used, the longitudinal adjusting steering wheel can rotate to enable the threaded column and the longitudinal adjusting support to generate displacement, so that longitudinal wheel dies fixedly connected with the second support are adjusted to generate displacement in the longitudinal direction, the effect of adjusting the distance between the two longitudinal wheel dies is achieved, and the device is suitable for square tubes of various types.
The power mechanism comprises a power source and a power rotating shaft driven by the power source, the power rotating shaft is fixedly connected with a fixed shaft of the longitudinal wheel mold arranged on the first support, wherein the power source can be a motor, and the rotating shaft of the motor, namely the power shaft and the fixed shaft, can be directly connected or indirectly connected, such as a belt wheel, a chain wheel and the like.
Wherein, at least one transverse adjusting bracket 24 is fixed on the working table top, and a threaded hole is arranged on the transverse adjusting bracket; the adjusting steering wheel is further provided with an adjusting steering wheel 25, a threaded column 26 is fixed on the adjusting steering wheel and matched with the threaded hole, the threaded column penetrates through the threaded hole to be rotatably connected with (the threaded column axially rotates to be radially fixed) a third support, in the scheme, the third support is fixed on the guide rail through the threaded column and the threaded hole and the threaded column and the third support in a rotating matching mode, when the steering wheel is rotatably adjusted, relative displacement is generated between a third support rail and the transverse adjusting support, so that the distance between the third support and the fourth support is adjusted, and the distance between two transverse wheel molds is adjusted.
The axial direction of the first channel and the second channel is also provided with two guide mechanisms, each guide mechanism comprises a guide support 27 and a roller 28 in rolling fit with the guide support, the horizontal tangent plane of each roller is coplanar with the horizontal tangent plane of the longitudinal wheel die positioned below, the axial direction of each roller is parallel to the axial direction of the longitudinal wheel die, and in the axial direction of the first channel and the second channel, one of the two guide mechanisms is positioned on one side of the transverse extrusion structure far away from the longitudinal extrusion structure, and the other guide mechanism is positioned on one side of the longitudinal extrusion structure far away from the transverse extrusion structure.
According to the technical scheme, the surfaces of the longitudinal wheel die and the transverse wheel die are subjected to surface nitriding treatment (the thickness of a nitriding layer is about 0.5mm), so that a high-hardness surface and toughness matrix can be obtained, and in the rolling process, the rolling precision is high, the service life is long, and the rolling surface flatness is high.
It will be apparent to those skilled in the art that modifications and equivalents may be made in the embodiments and/or portions thereof without departing from the spirit and scope of the present invention.
Claims (5)
1. A rib pressing process for a square high-strength metal pipe is characterized in that,
the rib pressing process comprises the following steps:
1) rolling up and down: the upper side surface and the lower side surface of the square metal pipe are extruded and deformed in the rolling process of an upper wheel die and a lower wheel die, so that the outer end surfaces of the upper side and the lower side are inwards concave;
2) rolling left and right: the left side surface and the right side surface of the square metal pipe are extruded and deformed in the rolling process of a left wheel die and a right wheel die, so that the outer end surfaces of the left side and the right side are inwards concave;
the upper rolling and the lower rolling and the left rolling and the right rolling are processed at two different stations on the same equipment, and the axes of the two stations are overlapped;
the apparatus comprises:
a work table;
the longitudinal extrusion structure is arranged on the working table surface and comprises two longitudinal wheel dies with parallel axes and sharing a first vertical surface, a first channel is arranged between the two longitudinal wheel dies, the two ends of the structure of the longitudinal wheel dies are symmetrical, each longitudinal wheel die comprises a cylindrical central roller, the two ends of each cylindrical central roller are provided with a circular truncated cone-shaped roller, the end part of each circular truncated cone-shaped roller is provided with a cylindrical frame, the outer end surface of each cylindrical frame is provided with a fixed shaft, the diameter of the connecting section of each circular truncated cone-shaped roller and each cylindrical frame is smaller than that of each cylindrical central roller, and the diameter of each cylindrical frame is larger than that of each cylindrical central roller;
the transverse extrusion structure is arranged on a working table surface and comprises two transverse wheel dies with parallel axes and a second vertical surface, a second channel is arranged between the two transverse wheel dies, the transverse extrusion mechanism comprises a third support, a fourth support and a guide rail, the third support and the fourth support are arranged in parallel, the guide rail is fixed on the working table surface, the third support and the fourth support are arranged on the guide rail and are fixedly matched with the guide rail in the sliding width direction in the length direction of the guide rail, the third support and the fourth support are symmetrical in structure, an upper fixing plate and a lower fixing plate are arranged on opposite surfaces of fixing plates oppositely arranged on the third support and the fourth support, the transverse wheel dies are arranged between the upper fixing plate and the lower fixing plate, two ends of each transverse wheel die are fixedly connected with the upper fixing plate and the lower fixing plate, each transverse wheel die comprises a wheel body and a connecting shaft arranged at two ends of the wheel body, the connecting shaft and the wheel body are axially fixed and radially rotationally matched, the wheel body is of a symmetrical structure at two ends, the wheel body comprises a cylindrical wheel body positioned at the center, round platform-shaped wheel bodies arranged at two ends of the cylindrical wheel body and a cylindrical frame wheel body arranged at the end part of the round platform-shaped wheel body, the diameter of one end, in contact with the cylindrical frame wheel body, of the round platform-shaped wheel body is smaller than that of the cylindrical wheel body, the diameter of the cylindrical frame wheel body is larger than that of the cylindrical wheel body, the fixing rod comprises thread sections positioned at two ends of the fixing rod and a smooth section between the two thread sections, a through hole is axially formed in the transverse wheel die, the fixing rod penetrates through the through hole, the thread sections are provided with nuts, the connecting shafts at two ends of the longitudinal wheel die are in contact fit with the lower, The fixing rod, the lower fixing plate and the connecting shaft are arranged on the connecting rod;
the longitudinal extrusion structure and the transverse extrusion structure are arranged on the working table at intervals in a certain direction, and the axes of the first channel and the second channel are overlapped;
at least one of the two longitudinal wheel dies and the two transverse wheel dies of the longitudinal extrusion structure and the transverse extrusion structure is driven by a power mechanism to rotate by taking the axis of the power mechanism as a center;
the first support comprises a first support A and a first support B, the second support comprises a second support A and a second support B, one end of one longitudinal wheel mold is rotatably connected with the first support A, the other end of the one longitudinal wheel mold is rotatably connected with the first support B, one end of the other longitudinal wheel mold is rotatably connected with the second support A, the other end of the other longitudinal wheel mold is connected with the second support B, the first support A is fixed on a working table surface, the first support B and the first support A are transversely fixed and longitudinally slidably matched, the second support A is fixed on the working table surface, the second support B and the second support A are transversely fixed and longitudinally slidably matched, at least one longitudinal adjusting support is fixed on the first support A in the first support A and the first support B, and longitudinal threaded holes are formed in the longitudinal adjusting support;
the steering wheel is fixed with a longitudinal threaded column, the longitudinal threaded column is matched with the longitudinal threaded hole, and the longitudinal threaded column penetrates through the longitudinal threaded hole to be rotatably connected with the second support A.
2. The rib pressing process for the square high-strength metal pipe as claimed in claim 1, wherein the longitudinal extrusion mechanism comprises a first support and a second support which are arranged in parallel, one end of the longitudinal wheel die is in rotating fit with the first support by taking the axis of the longitudinal wheel die as the center, and the other end of the longitudinal wheel die is in rotating fit with the first support by taking the axis of the longitudinal wheel die as the center.
3. The process of claim 1, wherein the power mechanism comprises a power source and a power shaft driven by the power source, and the power shaft is fixedly connected to a fixed shaft of a longitudinal wheel die mounted on the first support.
4. The process for beading square high-strength metal pipes according to claim 1, wherein at least one lateral adjusting bracket is fixed on the working table, and the lateral adjusting bracket is provided with a threaded hole; the steering wheel is fixed with a threaded column, the threaded column is matched with the threaded hole, and the threaded column penetrates through the threaded hole to be rotatably connected with the third support.
5. A rib-forming process for square high-strength metal pipe as claimed in claim 1, wherein there are two guiding mechanisms in the axial direction of the first and second channels, each guiding mechanism includes a guiding bracket and a roller in rolling fit with the guiding bracket, the transverse horizontal section of the roller is coplanar with the horizontal section of the longitudinal roller die under the roller, and the axial direction of the roller is parallel to the axial direction of the longitudinal roller die, one of the two guiding mechanisms is located at the side of the transverse extrusion structure far from the longitudinal extrusion structure, and the other is located at the side of the longitudinal extrusion structure far from the transverse extrusion structure in the axial direction of the first and second channels.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811628975.3A CN109759479B (en) | 2018-12-29 | 2018-12-29 | Rib pressing process for square high-strength metal pipe |
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| CN201811628975.3A CN109759479B (en) | 2018-12-29 | 2018-12-29 | Rib pressing process for square high-strength metal pipe |
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| CN109759479B true CN109759479B (en) | 2020-12-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1133491A (en) * | 1966-01-11 | 1968-11-13 | Metallifacture Ltd | Improvements in or relating to pipes |
| US6865918B2 (en) * | 2003-01-21 | 2005-03-15 | Wesley Todd Waldrop | Tube compressing roller die |
| KR20070080368A (en) * | 2006-02-07 | 2007-08-10 | 박태선 | Method for manufacturing accessories by using slender pipe and ornaments thereby |
| CN102530617B (en) * | 2012-03-01 | 2015-01-28 | 奇瑞汽车股份有限公司 | Roller pair conveying device |
| KR20150024633A (en) * | 2013-08-27 | 2015-03-09 | 최규일 | The metal pipes for building consist of the strength reinforcing device and thereof shaping method |
| CN203900180U (en) * | 2013-12-16 | 2014-10-29 | 东莞市竹菱铜业有限公司 | Full-automatic copper pipe making machine |
| CN104226760A (en) * | 2014-09-24 | 2014-12-24 | 浙江伟联科技有限公司 | Crumpling bending roll machine |
| CN205716385U (en) * | 2016-03-16 | 2016-11-23 | 黑龙江省太平洋货车网络科技有限公司 | Reinforced square steel tube |
| JP2017185498A (en) * | 2016-04-01 | 2017-10-12 | 日鐵住金建材株式会社 | Method and device for manufacturing metal tube with groove |
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