CN111553035A - Method for designing blanking opening degree of hot-base galvanized square tube pipe - Google Patents
Method for designing blanking opening degree of hot-base galvanized square tube pipe Download PDFInfo
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- CN111553035A CN111553035A CN202010367145.0A CN202010367145A CN111553035A CN 111553035 A CN111553035 A CN 111553035A CN 202010367145 A CN202010367145 A CN 202010367145A CN 111553035 A CN111553035 A CN 111553035A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000003466 welding Methods 0.000 claims abstract description 17
- 238000004513 sizing Methods 0.000 claims abstract description 15
- 238000005452 bending Methods 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 239000002253 acid Substances 0.000 abstract description 3
- 238000010924 continuous production Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 7
- 238000005246 galvanizing Methods 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/14—Pipes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a method for designing blanking openness of a hot-base galvanized square tube, belonging to the field of galvanized tube manufacturing, wherein a raw material is a hot-base galvanized plate, and the blanking openness W is Ax2 + Bx2-nT; when the cold bending high-frequency welding is directly produced, no hole expansion and no sizing are carried out, taking n as 1; when the sizing is not expanded, taking n as 2; in the reaming and sizing processing process, when a bending angle is made at a welding seam, n is 3; and when the welding seam is not bent, taking n as 4. The forming problem of the galvanized sheet produced on the basis of the hot-dip acid continuous production line in the square tube pipe making can be solved.
Description
Technical Field
The invention relates to a galvanizing pipe making process, in particular to a design and calculation method for the blanking opening degree of a hot-base galvanized square pipe making pipe.
Background
The galvanized sheet material is cut into strips and formed into pipes, and is widely applied to industries of building materials, vehicles, fitness equipment and the like. In the prior art, the base material with the thickness less than 1.7mm in the pipe making specification is generally a galvanized sheet of cold rolling base material.
With the development of the production technology of the hot-base thin-specification raw materials and the advanced process technology configuration of the acid plating continuous production line, the production of hot-base thin-specification (< 1.7mm) zinc-flower-free hot galvanizing can be realized. The hot-base thin-specification zinc-flower-free hot galvanizing process omits a cold rolling process, does not undergo cold rolling processing hardening, simultaneously omits a link of transporting steel coils between processes, has high production efficiency, greatly reduces the production cost and has stronger market competitiveness.
The galvanized pipe making process includes splitting galvanized coil, leveling, clamping, rolling to form pipe and bending. Wherein reasonable opening width, that is unloading width allowance is crucial: if the width allowance is too large, the extrusion amount is large when the tube is sized and rounded, the surface is damaged, and black lines are easy to generate. However, because the hot base material and the cold base material have different properties, the method is not suitable for calculating the opening degree of the blanking of the hot base material, and a new method is needed to meet the requirements of tube making and blanking.
Disclosure of Invention
The technical task of the invention is to solve the defects of the prior art, to be suitable for the design calculation of the tube-making blanking opening degree in the hot-base thin-specification galvanizing process, and to realize the stable forming of the hot-base thin-specification galvanized product in the galvanized square tube-making process.
The technical scheme for solving the technical problem is as follows: a method for designing the blanking openness of a hot-base galvanized square tube pipe is characterized by comprising the following steps: the raw material is a hot-base galvanized sheet material, and the opening degree W of blanking is Ax2 + Bx2-nT; when the cold bending high-frequency welding is directly produced, no hole expansion and no sizing are carried out, taking n as 1; when the sizing is not expanded, taking n as 2; in the reaming and sizing processing process, when a bending angle is made at a welding seam, n is 3; and when the welding seam is not bent, taking n as 4.
The yield strength Rel of the hot-base galvanized sheet material is less than or equal to 235MPa, n is 3, and if the yield strength Rel is greater than 235MPa, n is 4.
And when the n assignment conflicts, the n takes a larger value.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the design calculation of the invention can solve the problem of forming the galvanized sheet on the square pipe based on the hot base thin specification (less than 1.7mm) and the acid plating continuous production line, and reduce the welding quality defect caused by the blanking problem;
2. the invention is mainly applied to hot-base galvanized products with the production specification of 0.8-1.7mm, has stable production, good surface quality of the products and stable performance and size deviation, and can also be expanded to hot-base galvanized products adopted by pipe making materials with the thickness of 1.7-3.0 mm;
3. the cold-base galvanized sheet can replace the current cold-base galvanized sheet, is favorable for realizing the improvement of the cutting degree of materials and equipment, saves energy, reduces cost, realizes the upgrading and replacement of the products in the industry by new materials, and has considerable social and economic benefits.
Drawings
FIG. 1 is a pictorial representation of a control panel of the invention showing the final product.
FIG. 2 is a pictorial representation of an end product of an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
The invention relates to a galvanized pipe making process which belongs to the prior art, namely galvanized coils are separated into strips, then are fed into a pipe making roll through flattening clamping and bending forming. The specific process steps specifically aimed at by the invention are the design calculation of the width of the blanking opening, so other procedures of the galvanized pipe making process which are not improved are not described repeatedly.
In the prior art, a method for calculating the blanking opening degree of a galvanized pipe (square pipe) with a cold-base galvanized thin specification (less than 1.7mm) comprises the following steps: w is Ax2 + Bx2-6.745T +1.2, wherein W is the opening degree of the blanking; A. b is the length and width of the section of the square tube; 6.745 is a constant coefficient; t is the wall thickness of the formed tube; and 1.2 is a compensation amount.
Control group: by adopting the cold-base design calculation method, the hot-base galvanized product with the specification of 1.35mm is produced (other parameters are shown in the data of the embodiment group). As a result, as shown in FIG. 1 (left: low yield, right: black line on surface), after the hot-base galvanized sheet material enters the roll-forming section from the leveler, the galvanized sheet surface and the forming roll are deformed in the direction of smooth asymptote, the forming plastic deformation force of the galvanized sheet at the deformed position is not uniformly stressed, and the slide is easily scratched to generate black line at the concentrated stressed position. The reason is that the hot base material and the cold base material have different properties (the cold base material has high strength and low elongation compared with the hot base material and the cold base material of the same brand), the sizing process of the manufactured square tube belongs to an expanding mode, and the low elongation can cause the phenomenon of incomplete welding or large intermittent welding in a front-section high-frequency welding area in the sizing process of the square tube.
Example set: the thermal base design calculation method is adopted.
The opening degree W of the blanking is Ax2 + Bx2-deltaC. Δ C ═ nT.
I.e. W ═ a × 2+ B × 2-nT.
Wherein W is the opening degree of the blanking; A. b is the length and width of the square tube section, and when the section is square, A is B; Δ C is the remainder; t is the wall thickness of the formed tube.
Δ C is related to the strength of the material and the processing technique.
When cold bending high-frequency welding direct production is carried out, and no sizing is carried out without reaming, taking n as 1; and when the sizing is not expanded, taking n as 2. The parameter selection is suitable for the pipe manufacturing production of the hot-base galvanized product with the specification of 1.7-3.0 mm.
When a bending angle is formed at a welding seam in the reaming and sizing processing technology, taking n as 3; and when the welding seam is not bent, taking n as 4.
The material strength is based on the yield strength Rel ≤ 235MPa, and n ═ 3, and if the yield strength Rel > 235MPa, n ═ 4.
When the above assignment conflict occurs, n takes a larger value, such as: the yield strength Rel is more than 235MPa, and when the bending angle is required by the process, n is 4.
Example (b): the material with the 1.35mm square tube section specification of 4in multiplied by 2in (1in is 2.54mm) is adopted: SGHC.
(1) The process requirements are as follows: the square tube adopts a reaming and sizing process and the welding line is not bent; taking n-4 according to the process requirement.
(2) The material performance requirements are as follows: the material SGHC is a daily standard product, and the yield strength is as follows: rel is more than or equal to 205MPa and less than or equal to 245 MPa; and taking n-3 according to the process requirement.
(3) When the two n values are not consistent, taking the maximum n-4 as a calculation coefficient,
substituting the formula W as a × 2+ B × 2-nT.
W＝4×2.54×2+2×2.54×2－4×1.35＝25.08mm
The final product is shown in figure 2, and has high yield and no black line on the surface.
By adopting the method for calculating the blanking opening degree of the hot-base thin-specification galvanized pipe (square pipe), the hot-base galvanized product with the specification of 0.8-1.7mm can be stably produced, the surface quality of the product is good, the performance and the size deviation are stable, and the method can replace the current cold-base galvanized plate. On the basis of keeping the original functions, the energy is saved, the cost is reduced, the upgrading and replacement of products in the industry are realized, and considerable social and economic benefits are achieved.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.
Claims (3)
1. A method for designing the blanking openness of a hot-base galvanized square tube pipe is characterized by comprising the following steps: the raw material is a hot-base galvanized sheet material, and the opening degree W of blanking is Ax2 + Bx2-nT; when the cold bending high-frequency welding is directly produced, no hole expansion and no sizing are carried out, taking n as 1; when the sizing is not expanded, taking n as 2; in the reaming and sizing processing process, when a bending angle is made at a welding seam, n is 3; and when the welding seam is not bent, taking n as 4.
2. The method for designing the blanking opening degree of the hot-base galvanized square pipe according to the claim 1, which is characterized in that: the hot-base galvanized sheet material has the strength that the yield strength Rel is less than or equal to 235MPa, n is 3, and if the yield strength Rel is more than 235MPa, n is 4.
3. The design method for the blanking openness of the hot-base galvanized square tube according to claim 2, characterized in that: and when the n assignment conflicts, the n takes a larger value.
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| CN202010367145.0A CN111553035B (en) | 2020-04-30 | 2020-04-30 | Design method for blanking opening degree of hot-base galvanized square pipe manufacturing |
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| CN202010367145.0A CN111553035B (en) | 2020-04-30 | 2020-04-30 | Design method for blanking opening degree of hot-base galvanized square pipe manufacturing |
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| CN111553035A true CN111553035A (en) | 2020-08-18 |
| CN111553035B CN111553035B (en) | 2023-08-08 |
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Citations (8)
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|---|---|---|---|---|
| CN101134277A (en) * | 2007-09-26 | 2008-03-05 | 中冶陕压重工设备有限公司 | Manufacturing method of surface-quenching chromium-plating winded-welding roller |
| CN101644921A (en) * | 2009-08-05 | 2010-02-10 | 无锡信捷电气有限公司 | Improved method for designing numerical control bending of plate |
| CN102405116A (en) * | 2009-04-24 | 2012-04-04 | 阿里汉家用设备有限公司 | Low-carbon welded pipe and manufacturing method thereof |
| US20150283946A1 (en) * | 2014-04-03 | 2015-10-08 | Zhihui Metal Industrial Co., Ltd. | Automobile c-type chute side-bar pedal and production processes of the same |
| JP2017124444A (en) * | 2015-12-24 | 2017-07-20 | Ｊｆｅスチール株式会社 | Manufacturing method for electroseamed steel pipe of small pipe-making strain and electroseamed steel pipe of small pipe-making strain |
| JP2018015799A (en) * | 2016-07-29 | 2018-02-01 | Ｊｆｅスチール株式会社 | Manufacturing method of steel pipe and steel pipe |
| WO2018227961A1 (en) * | 2017-06-15 | 2018-12-20 | 京东方科技集团股份有限公司 | Method for designing metal mask plate and method for preparing metal mask plate |
| JP2019116657A (en) * | 2017-12-27 | 2019-07-18 | Ｊｆｅスチール株式会社 | Thick walled large diameter electroseamed steel pipe excellent in fatigue strength, and manufacturing method therefor |
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2020
- 2020-04-30 CN CN202010367145.0A patent/CN111553035B/en active Active
Patent Citations (8)
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| CN101134277A (en) * | 2007-09-26 | 2008-03-05 | 中冶陕压重工设备有限公司 | Manufacturing method of surface-quenching chromium-plating winded-welding roller |
| CN102405116A (en) * | 2009-04-24 | 2012-04-04 | 阿里汉家用设备有限公司 | Low-carbon welded pipe and manufacturing method thereof |
| CN101644921A (en) * | 2009-08-05 | 2010-02-10 | 无锡信捷电气有限公司 | Improved method for designing numerical control bending of plate |
| US20150283946A1 (en) * | 2014-04-03 | 2015-10-08 | Zhihui Metal Industrial Co., Ltd. | Automobile c-type chute side-bar pedal and production processes of the same |
| JP2017124444A (en) * | 2015-12-24 | 2017-07-20 | Ｊｆｅスチール株式会社 | Manufacturing method for electroseamed steel pipe of small pipe-making strain and electroseamed steel pipe of small pipe-making strain |
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| WO2018227961A1 (en) * | 2017-06-15 | 2018-12-20 | 京东方科技集团股份有限公司 | Method for designing metal mask plate and method for preparing metal mask plate |
| JP2019116657A (en) * | 2017-12-27 | 2019-07-18 | Ｊｆｅスチール株式会社 | Thick walled large diameter electroseamed steel pipe excellent in fatigue strength, and manufacturing method therefor |
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Denomination of invention: A design method for the opening degree of hot-dip galvanized square tube cutting Effective date of registration: 20231215 Granted publication date: 20230808 Pledgee: Rizhao Bank Co.,Ltd. Pledgor: RIZHAO STEEL HOLDING GROUP Co.,Ltd. Registration number: Y2023980072204 |
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