WO2006057074A1 - 角管成形用ロールと角管のロール成形方法及び成形装置 - Google Patents
角管成形用ロールと角管のロール成形方法及び成形装置 Download PDFInfo
- Publication number
- WO2006057074A1 WO2006057074A1 PCT/JP2004/019825 JP2004019825W WO2006057074A1 WO 2006057074 A1 WO2006057074 A1 WO 2006057074A1 JP 2004019825 W JP2004019825 W JP 2004019825W WO 2006057074 A1 WO2006057074 A1 WO 2006057074A1
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- WO
- WIPO (PCT)
- Prior art keywords
- tube
- forming
- roll
- section
- square tube
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D15/00—Corrugating tubes
- B21D15/02—Corrugating tubes longitudinally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
- B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes
- B21D5/12—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes making use of forming-rollers
-
- 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
- B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
Definitions
- the present invention relates to a forming roll for re-forming a round tube into a square tube, and its forming method and apparatus.
- a high-quality square tube having excellent shape and dimensional characteristics can be manufactured at low cost.
- the present invention relates to a roll for forming a square tube, a method for forming a mouthpiece of a square tube, and a forming apparatus.
- a number of configurations have been proposed as a main means for manufacturing a square tube as an apparatus and a molding method for re-forming a round tube having a circular cross section into a square cross section or a rectangular cross section with a forming roll.
- the above-mentioned forming stand is usually placed 3 to 3 along the axial direction of the raw tube. Arrange about 4 stages and change the cross-sectional shape of the raw tube sequentially.
- Patent Document 1 discloses a roll forming apparatus and a forming method related to a means for re-forming a square tube.
- this forming means see Fig. 7
- the rotary shafts of the upper and lower forming roll pairs and the rotary shafts of the left and right forming roll pairs are arranged in different cross sections. Has been. Therefore, each roll position adjustment does not interfere with each other, and even a forming roll having a single curvature in the rotation axis direction can cope with different product dimensions by adjusting the position. This makes it easier to automate and NC process.
- a device that plastically deforms a circular cross-sectional shape by using a plurality of forming mouth pairs having a forming surface of a V-shaped recess from only two sides instead of a four-way roll stand (See Fig. 8) .
- the forming roll is smaller than the outer diameter of the blank tube in a small product. It is used only when it is large enough and is not common.
- the commonality of the mouthpiece is small for different product dimensions.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2000-301233
- Patent Document 2 Japanese Patent Laid-Open No. 5-212440
- Patent Document 3 Japanese Patent Laid-Open No. 6-262253
- the inventors have developed the forming means disclosed in the above-mentioned Patent Document 1 in order to use the rolls together, but the roll caliber has a single or linear curvature in each roll.
- the above-mentioned problems are not essentially resolved.
- the radius of curvature of the roll caliber is formed by forming a pipe having a large cross-sectional curvature radius. If it is set so that it can be used, the radius of curvature of the mouthpiece caliber will be excessive for a tube with a small radius of curvature.
- the object of the present invention is to eliminate the above-mentioned problems found by the inventors, and to convert a circular tube into a square tube without imposing an excessive burden on a planned portion that becomes a corner portion and a shoulder portion of the raw tube.
- a forming roll for a square tube has a round tube with a round tube as a raw tube, and a vertical molding in which a rotation axis is arranged in a plane including the cross section of the raw tube.
- the curvature of the surface of the forming roll in the direction of the rotation axis is configured such that the straightening of the portion planned portion is preceded by another raw tube portion (other side planned portion).
- the configuration of the roll caliber that is the essence of the present invention is as follows.
- the forming roll for a square tube according to the present invention is a base tube that becomes the shoulder of the cross section of the square tube out of the curvature in the rotation axis direction of the surface of the forming roll.
- part is smaller than the curvature which restrains the raw-tube site
- the curvature in the rotation axis direction of the surface of the forming roll is continuously or stepwise reduced from the position constraining the raw tube portion serving as the center of the side toward both outer sides. Also good.
- the shape of the peripheral surface of the forming roll instead of simply dividing the curvature into two stages, by selecting to change the curvature in multiple steps or continuously, you can also use a single tool for forming different product sizes. Even so, straightening of the tube part that always becomes the shoulder can be preceded by other parts.
- the square tube molding method and molding apparatus according to the present invention are as described above.
- (1) The surface of the molding mouth surface is straightened so that the straight tube portion that becomes the shoulder portion adjacent to the corner portion of the square tube is preceded by the raw tube portion that is the other portion of the square tube side portion.
- the curvature that constrains the raw tube portion that becomes the shoulder adjacent to the corner portion of the square tube is the raw tube portion that becomes the center of the side of the cross section of the square tube Forming roll with a smaller configuration than the curvature that restrains
- a sufficient bending moment can be applied to the raw tube portion serving as the shoulder from the initial stage of the forming by the roll to be used for linearization. Therefore, according to the molding method of the present invention, there is no significant occurrence of circumferential drawing and local rolling of the shoulder as in the case of forming a square tube. As a result, there is a problem of insufficient toughness at the corner and the shoulder. This reduces the reproducibility of the curvature of the corners and the flatness of the sides of the resulting square tube, and reduces the indentation scratches in the final product.
- the method for forming a square tube according to the present invention includes a step of forming the raw tube by forming the forming roll of the present invention into a so-called four-way roll, that is, a pair of upper and lower forming nozzles and a left and right forming roll.
- the forming roll of the invention is formed into so-called alternating two-way rolls, and the raw pipe is formed, that is, the rotary shafts of the upper and lower forming pair and the left and right forming pair are different for each roll pair.
- the present invention it is possible to employ a method of forming a square tube with a process pattern in which the forming processes are combined in various ways as required.
- the first stage of the molding process Finally, a four-sided roll process is adopted in which the forming roll of the present invention is formed into a so-called four-way roll and a raw pipe is formed, and the forming roll of the present invention is configured as a so-called alternating two-way roll between these two processes.
- the square tube forming method according to the present invention employs the above-mentioned four-way one-step process and alternate two-way roll step in combination with conventionally known various processes (known various molding mouth stands) according to various purposes. Or a known process during the process pattern of the present invention described above.
- the forming roll of the present invention when the forming roll of the present invention is formed into a so-called alternating two-way roll and includes a step of forming a raw tube, the cross-section of the square tube is previously provided before the re-forming process. It is possible to increase the efficiency of the process by heating the tube portion that becomes the corner of the tube.
- the square tube forming apparatus includes a step of forming the above-described forming roll of the present invention into a so-called four-way opening and forming a raw tube, and forming the forming roll into a so-called alternating two-way roll to form a raw tube
- a roll forming line in which each forming roll stand with a four-way mouth configuration and a two-way mouth one configuration is arranged in the necessary number of stages to realize the various process patterns selected.
- a four-way mouth stand composed of the molding tool of the present invention is adopted at the first stage and the last stage of the re-forming apparatus, and a two-way mouth stand composed of the molding roll of the present invention is interposed between these stands.
- Various stand combinations such as single or multiple arrangements can be adopted.
- the square tube forming apparatus according to the present invention it is possible to adopt a configuration provided with a heating means for preheating a raw tube portion that becomes a corner portion of the square tube cross section before forming by the forming nozzle. .
- a molding apparatus equipped with a multi-stage molding roll stand is generally used.
- a preliminary molding stand provided for the purpose of rounding the raw tube in advance and increasing the thrust is included. May also exist. But these are not directly Since it does not contribute to the forming of the tube, it is not counted in the number of forming steps of the square tube forming process in the present invention.
- the molding method and molding apparatus that employs the molding roll of the present invention, in the initial stage of the re-forming process of the square tube, straightening of the raw tube portion that becomes the shoulder adjacent to the corner of the square tube It is possible to significantly reduce the dependence on the circumferential drawing and the local rolling of the shoulder at the final stage of the process to finish the desired product shape and dimensions. As a result, the problem of insufficient toughness at the corner and its adjacent parts is alleviated, the reproducibility of the curvature of the corner and the flatness of the side in the obtained square tube are improved, and the indentation and scratch in the final product are improved. Reduced.
- the molding means disclosed in Patent Document 1 is more effective according to the present invention. That is, the configuration of the force river curvature of the square tube forming roll according to the present invention eliminates the problem of compatibility between the different raw tube diameters and the single force river curvature radius in the combined use of the roll described above. This eliminates the need for conventional measures that divide the product size range into a number of dull loops and handle each roll group, and greatly reduces the number of forming rolls and the number of forming steps.
- an optimum balance between the combined roll effect and the equipment cost is achieved. For example, by placing a molding stand with a four-way roll configuration in the first stage of the molding process, determining the exact location of the planned corner of the square tube, and then providing a molding stand with a two-way roll configuration, The molding efficiency of the mouthpiece configuration can be increased. In the final stage of the process Therefore, the corner shape and dimensions can be finished more reliably, and the number of forming steps of the entire apparatus can be greatly reduced.
- the present invention after heating the raw tube portion that becomes the corner of the cross section of the square tube before the square tube re-forming process, the present invention
- the forming roll can be formed into a two-way roll to form a blank tube. Since the tube portion that becomes the corner is locally heated and the deformation resistance is smaller than that of other tube portions, the bending back phenomenon of the tube portion is restrained without restriction in forming with a two-way roll. Without heating, the dependency on the four-way roll stand is low compared to the molding, and the number of four-way roll stands that need to be replaced can be further reduced.
- FIG. 1 is a perspective explanatory view showing a schematic configuration of a square tube forming apparatus according to a first embodiment of the present invention.
- FIG. 2 is a front explanatory view of an example of a forming roll having an outer peripheral shape composed of two curvatures of the present invention.
- FIG. 3 is a front explanatory view of an example of a forming roll having an outer peripheral shape composed of three or more curvatures of the present invention.
- FIG. 4A is an explanatory view showing a part of the raw tube
- FIG. 4B is an explanatory view showing each part of the square tube
- a to c and A to C show the parts of the corresponding raw tube and the square tube.
- FIG. 5 is a perspective explanatory view showing a schematic configuration of a square tube forming apparatus according to the second embodiment of the present invention.
- FIG. 6 is a perspective view showing a schematic configuration of a conventional square tube forming apparatus using a forming roll having an outer peripheral shape having a single curvature.
- FIG. 7 is a perspective view showing a schematic configuration of another conventional square tube forming apparatus using a forming roll having an outer peripheral shape having a single curvature.
- FIG. 8 is a front view of a forming roll having a forming surface of a conventional V-shaped recess.
- FIG. 9 is a front view of a forming roll having an outer peripheral shape having a conventional single curvature.
- the inventors of the present invention including any of the above-described conventional forming apparatuses, have a portion in the shape of the circumferential surface of the forming roll called a roll caliber in the direction of the rotation axis as shown in FIG.
- a roll caliber in the direction of the rotation axis as shown in FIG.
- the inventors have not only problems in dimensional accuracy such as variations in curvature of the corners and deterioration in flatness of the sides in the square tube after molding, but also excessive amounts in the corners and shoulders. It was discovered that due to the deformation, the toughness of the square tube product was insufficient, and there was a problem that the same part was easily broken.
- the straight tube portion adjacent to the planned portion of the corner of the square tube predetermined shoulder portion
- the curvature of the rotational axis direction of the surface of the forming roll is configured so as to precede the part).
- FIG. 1 shows a perspective view of a first embodiment of the square tube forming apparatus of the present invention.
- the square tube forming apparatus in the present embodiment is composed of 10 stages of forming roll pairs. Among them, a forming roll stand 10 for forming the raw pipe first (hereinafter referred to as the most upstream forming roll stand) and a forming stand for forming at the end.
- the most downstream forming roll stand 30 (hereinafter referred to as the most downstream forming roll stand) is a so-called arrangement in which the roll rotation shafts of the upper and lower forming roll pairs and the left and right forming roll pairs are located in a plane including a single cross section. It is a stand with a four-way entrance.
- the molding unit stand 20 disposed between the most upstream side molding roll stand 10 and the most downstream side molding roll stand 30 has four stages of upper and lower molding roll pairs 21a to 24a, and four stages.
- Left and right forming roll pairs 21b to 24b, and the roll rotation axis of each stand of these forming mouth stands 20 is arranged in a plane including a cross section of a different tube for each mouth pair.
- a forming roll stand having a so-called two-way roll configuration.
- the upper and lower forming nozzle pairs 21a to 24a and the left and right forming roll pairs 21b to 24b are alternately arranged at predetermined intervals.
- each forming roll is driven by a known driving device.
- all the said forming rolls are comprised by the curvature of the roll surface direction of this roll surface so that the straight pipe
- the curvature that constrains the tube part that becomes the shoulder adjacent to the corner of the square tube is smaller than the curvature that constrains the tube part that becomes the center of the side of the cross section of the square tube.
- the forming roll as a more preferred embodiment, as shown in FIG.
- the curvature in the rotation axis direction of the surface of the forming roll is located on both outer sides from the position where the raw tube portion that becomes the center of the side of the square tube cross section is constrained. It is possible to use a molding mouth that decreases continuously or stepwise toward the surface.
- the curvature radii Rl, R2 ..., Rn in the figure are appropriately selected depending on the outer diameter range of the raw pipe to be formed, the material of the raw pipe, and the like.
- FIG. 5 shows a perspective view of a second embodiment of the square tube forming apparatus of the present invention.
- the square tube forming apparatus in the present embodiment is composed of an eight-stage forming single stand.
- the eight-stage forming roll pair is composed of four-stage upper and lower forming roll pairs 21a to 24a, and left and right forming roll pairs 21b to 24b each having four stages.
- the upper and lower forming roll pairs and the left and right forming roll pairs are alternately arranged at predetermined intervals.
- All the forming rolls are the same as those in the first embodiment.
- the forming roll shown in FIG. 2 or FIG. 3 is suitable.
- a heating device 40 that heats the raw tube portion that finally becomes the corner of the cross section of the square tube is provided upstream of each pair of forming rolls.
- the upper and lower two-way roll stands and the left and right two-way roll stands having the same configuration as in the first embodiment are used.
- a rectangular tube is formed.
- Various heating means are conceivable, but it is desirable that the temperature can be controlled by the control device and the temperature range in which the deformation resistance value of the raw tube material is significantly reduced can be appropriately selected for each material and heated.
- this embodiment uses a medium frequency induction heating device. This type of heating device can manage the heating temperature by appropriately selecting the frequency and input current value according to the product wall thickness, the cross-sectional area of the corner and the molding speed.
- heating the part of the tube that becomes the corner before the square tube re-forming process greatly improves the certainty of forming with the dual-purpose roll, so the mouthpiece is replaced. It is possible to reduce the number of four-sided roll stands that need to be removed or to eliminate them completely, and the effect of combining rolls is further enhanced.
- Table 1 shows a comparison with the case of the prior art described above.
- FIG. 7 shows a molding apparatus composed of only two-way rolls described in Patent Document 1, and the surface shape of each molding roll has a single curvature.
- “Conventional (1)” in the table indicates the case of the prior art shown in FIG. 6, and “Conventional (2)” indicates the case of the prior art related to FIG.
- “Invention (1)” is an example of the first embodiment of the present invention
- “Invention (2)” is an example of the second embodiment of the present invention.
- the possible forming range of the forming equipment includes 17 types of square tube products as shown in Table 1.
- the rotation axes of the rolls are arranged in the same plane, so that only one of the upper and lower forming roll pairs and the left and right forming roll pairs can be driven by machine interference.
- most of the molding stands are driven only by a pair of upper and lower rolls, and it is difficult to obtain a thrust for ensuring a stable molding speed with these stands alone. Therefore, the thrust is usually increased upstream of the conventional square tube forming device (“Conventional (1)” in Table 2) consisting of a four-way roll stand.
- a two-level four-way roll stand is provided for the purpose of, and the number of rolls corresponding to the type of the dimensions of the raw tube must be prepared for these stands.
- the problem of mechanical interference does not exist, and both the upper and lower forming roll pairs and the left and right forming roll pairs can be driven, and sufficient thrust can be obtained.
- Table 2 in the case of “Conventional (1)”, many forming rolls are required to cover the product range shown in Table 1, which is very expensive.
- the burden of roll change work is large and the productivity is poor.
- invention of the present invention has four-way roll stands at the most upstream and the most downstream of the square tube re-forming process, and these forming stands must have a dedicated roll for each product size.
- the number of two-way roll stands is greatly reduced compared to “Conventional (2)”, and the overall equipment cost and productivity can be well balanced.
- the present invention (2) eliminates the need to use a four-sided roll stand by preheating the tube portion that becomes the corner and reducing its deformation resistance, which is more than that of the present invention (1).
- the number of forming stands and forming rolls can be greatly reduced, and productivity can be further increased.
- the tube diameter required for forming square tube products with the same dimensions is ⁇ present invention (1) '' and ⁇ present invention (2) '' compared to ⁇ conventional (1) '' and ⁇ conventional (2) ''.
- a decrease of 1.0 to 2.0% was confirmed depending on the product dimensions. This is because by using the forming roll and the forming method of the present invention, drawing and rolling phenomena on the forming tube are reduced.
- Tube outer diameter (product thickness t range 3.0mm ⁇ 16.0mm) Round tube diameter mm
- the present invention can remarkably reduce the dependence on the circumferential drawing and the local rolling of the shoulder at the final stage of the process to finish the desired product shape and dimensions.
- the problem of lack of toughness at the corner and its adjacent parts is alleviated, the reproducibility of the curvature of the corner and the flatness of the side of the obtained square tube are improved, and a high-quality square tube is converted from a round tube.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020077014126A KR101149658B1 (ko) | 2004-11-26 | 2004-12-27 | 각관 성형용 롤과 각관의 롤 성형방법 및 성형장치 |
EP04808175.6A EP1815921B1 (en) | 2004-11-26 | 2004-12-27 | Roll for molding square tube and method and device for rollingly molding square tube |
US11/719,841 US7921688B2 (en) | 2004-11-26 | 2004-12-27 | Square tube forming roll, square tube forming method, and forming device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-341516 | 2004-11-26 | ||
JP2004341516A JP4780952B2 (ja) | 2004-11-26 | 2004-11-26 | 角管成形用ロールと角管のロール成形方法及び成形装置 |
Publications (1)
Publication Number | Publication Date |
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WO2006057074A1 true WO2006057074A1 (ja) | 2006-06-01 |
Family
ID=36497821
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/019825 WO2006057074A1 (ja) | 2004-11-26 | 2004-12-27 | 角管成形用ロールと角管のロール成形方法及び成形装置 |
Country Status (7)
Country | Link |
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US (1) | US7921688B2 (ja) |
EP (1) | EP1815921B1 (ja) |
JP (1) | JP4780952B2 (ja) |
KR (1) | KR101149658B1 (ja) |
CN (1) | CN100540170C (ja) |
RU (1) | RU2386509C2 (ja) |
WO (1) | WO2006057074A1 (ja) |
Cited By (1)
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CN113996680A (zh) * | 2021-10-13 | 2022-02-01 | 姚建民 | 型材尖锐r角挤轧工艺及挤轧设备 |
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- 2004-12-27 CN CNB2004800448402A patent/CN100540170C/zh not_active Expired - Fee Related
- 2004-12-27 KR KR1020077014126A patent/KR101149658B1/ko active IP Right Grant
- 2004-12-27 RU RU2007119583/02A patent/RU2386509C2/ru active
- 2004-12-27 WO PCT/JP2004/019825 patent/WO2006057074A1/ja active Application Filing
- 2004-12-27 EP EP04808175.6A patent/EP1815921B1/en not_active Not-in-force
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CN113996680A (zh) * | 2021-10-13 | 2022-02-01 | 姚建民 | 型材尖锐r角挤轧工艺及挤轧设备 |
CN113996680B (zh) * | 2021-10-13 | 2024-05-14 | 姚建民 | 型材尖锐r角挤轧工艺及挤轧设备 |
Also Published As
Publication number | Publication date |
---|---|
EP1815921A4 (en) | 2008-07-23 |
CN101102857A (zh) | 2008-01-09 |
KR20070099570A (ko) | 2007-10-09 |
EP1815921B1 (en) | 2014-04-23 |
JP4780952B2 (ja) | 2011-09-28 |
RU2386509C2 (ru) | 2010-04-20 |
EP1815921A1 (en) | 2007-08-08 |
CN100540170C (zh) | 2009-09-16 |
RU2007119583A (ru) | 2009-01-10 |
US20080302160A1 (en) | 2008-12-11 |
JP2006150377A (ja) | 2006-06-15 |
US7921688B2 (en) | 2011-04-12 |
KR101149658B1 (ko) | 2012-09-07 |
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