CN111553035B - Design method for blanking opening degree of hot-base galvanized square pipe manufacturing - Google Patents
Design method for blanking opening degree of hot-base galvanized square pipe manufacturing Download PDFInfo
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- CN111553035B CN111553035B CN202010367145.0A CN202010367145A CN111553035B CN 111553035 B CN111553035 B CN 111553035B CN 202010367145 A CN202010367145 A CN 202010367145A CN 111553035 B CN111553035 B CN 111553035B
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- 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 OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/14—Pipes
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Abstract
The invention discloses a method for designing the blanking opening degree of a hot-base galvanized square pipe, which belongs to the field of galvanized pipe manufacture, wherein the raw material is a hot-base galvanized sheet material, and the blanking opening degree W=A× 2+B ×2-nT; when cold bending high-frequency welding is directly carried out, and reaming is not carried out and sizing is not carried out, n is 1; when sizing is not reaming, n is 2; in the reaming and sizing processing technology, when a bending angle is formed at a welding line, n is 3; when the welding line does not make a bending angle, n is 4. Can solve the problem of forming galvanized sheet in square pipe manufacture produced by a base Yu Reji acid plating continuous production line.
Description
Technical Field
The invention relates to a galvanization pipe making process, in particular to a design calculation method for blanking opening degree of a hot-base galvanization square pipe making.
Background
The galvanized sheet material strip cutting and pipe forming is widely applied to industries such as building materials, vehicles, fitness equipment and the like. In the prior art, galvanized plates with cold rolled base materials are commonly used as base materials with the pipe specification thickness less than 1.7 mm.
Along with the development of the production technology of the heat-based thin-specification raw materials and the advanced process technology configuration of the acid plating continuous production line, the production of the zinc-flower-free hot galvanizing of the heat-based thin specification (less than 1.7 mm) can be realized. The hot-base thin-specification zinc-flower-free hot galvanizing process omits the cold rolling process, does not undergo cold rolling work hardening, omits the step of transferring steel coils among the processes, has high production efficiency, greatly reduces the production cost and has stronger market competitiveness.
The galvanized pipe making process is that galvanized rolls are split and then are leveled, clamped and sent into a pipe making roll to be bent and formed. Wherein a reasonable opening width, i.e. the blanking width margin, is of critical importance: if the width allowance is too large, the extrusion amount is large when the tube is sized into a round shape, the surface is damaged, and black lines are easy to generate. However, because of the difference between the properties of the hot base material and the cold base material, the method is not suitable for calculating the blanking opening degree of the hot base material, and a new method is needed to meet the requirement of blanking of the pipe.
Disclosure of Invention
The technical task of the invention is to solve the defects in the prior art, and is suitable for design calculation of the blanking opening degree of the pipe in the hot-base thin-specification galvanized process, so that the hot-base thin-specification galvanized product is stably molded in the galvanized square pipe manufacturing process.
The technical scheme for solving the technical problems is as follows: a design method for the blanking opening degree of a hot-base galvanized square pipe is characterized by comprising the following steps: the raw material is a hot-base galvanized sheet material, and the blanking opening degree W=A× 2+B ×2-nT; when cold bending high-frequency welding is directly carried out, and reaming is not carried out and sizing is not carried out, n is 1; when sizing is not reaming, n is 2; in the reaming and sizing processing technology, when a bending angle is formed at a welding line, n is 3; when the welding line does not make a bending angle, n is 4.
The strength of the hot-base galvanized sheet material is equal to or less than 235MPa, the yield strength Rel is 3, and if the yield strength Rel is more than 235MPa, the yield strength is 4.
When the n assignment conflicts, 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 galvanized sheet on square tube production based on heat base thin specification (less than 1.7 mm) and acid plating continuous production line, and reduce welding quality defect caused by 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 product surface quality and stable performance and dimensional deviation, and can also be expanded to hot-base galvanized products adopted by pipe materials with the thickness of 1.7-3.0 mm;
3. can replace the current cold-base galvanized sheet, is favorable for realizing the improvement of the degree of fit of materials and equipment, saves energy, reduces cost, realizes the upgrading and replacement of new materials to products in the industry, and has considerable social and economic benefits.
Drawings
FIG. 1 is a physical diagram of the final product of the control group of the present invention.
FIG. 2 is a physical diagram of the end product of the group of embodiments of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
The galvanized pipe making process is in the prior art, namely, galvanized rolls are split and then sent into pipe making roll bending forming after flattening and clamping. The specific process steps specifically aimed at by the invention are design calculation of the blanking opening width, so that the other working procedures of the non-improved parts of the galvanized pipe manufacturing process are not described again.
In the prior art, the method for calculating the blanking opening degree of the galvanized pipe (square pipe) with the cold base galvanized thin specification (less than 1.7 mm) comprises the following steps: w=a× 2+B ×2-6.745t+1.2, wherein W is the feed opening degree; A. b is the length and width of the section of the square tube; 6.745 is a constant; t is the wall thickness of the formed tube; 1.2 is the compensation amount.
Control group: by adopting the cold base design calculation method, a hot base galvanized product with the specification of 1.35mm is produced (other parameters are shown in the data of the example group). As shown in FIG. 1 (left: low yield, right: black line on the surface), after the hot-base galvanized sheet enters the roll forming section from the straightener, the galvanized sheet and the forming roll deform in a smooth asymptotic direction, the plastic deformation force of the galvanized sheet at the deformation part is unevenly stressed, and the black line is easily generated on the scratch slideway at the concentrated stress part. The reason is that the performance of the hot base material and the performance of the cold base material are different (the strength of the cold base material is high compared with the same brand, the elongation is low), the pipe making process belongs to the diameter expanding mode in the process of forming square pipe sizing, and the phenomenon of welding failure or intermittent welding large in a front section high-frequency welding area can occur in the process of sizing the square pipe with low elongation.
Group of examples: the heat base design calculation method is adopted.
The feed opening w=a× 2+B ×2- Δc. Δc=nt.
I.e. w=a× 2+B ×2-nT.
Wherein W is the opening degree of blanking; A. b is the length and width of the square tube section, a=b when the section is square; delta C is the balance; t is the wall thickness of the formed tube.
ΔC is related to the strength of the material and the processing technique.
When cold bending high-frequency welding direct production is carried out, n is 1 when reaming is not carried out and sizing is not carried out; and when sizing is not reaming, n is 2. The above parameters are selected to be suitable for the production of the tube by using the hot-base galvanized product with the specification of 1.7-3.0 mm.
When a bending angle is formed at a welding line in the reaming and sizing processing technology, n is 3; when the welding line does not make a bending angle, n is 4.
In addition, the material strength is based on the yield strength Rel < 235MPa, n=3, and if the yield strength Rel > 235MPa, n=4.
When the assignment conflict occurs, n takes a larger value, such as: and when the yield strength Rel is more than 235MPa and the process requirement is a bending angle, n is 4.
Examples: the square tube manufactured by 1.35mm is made of 4in multiplied by 2in (1 in=2.54 mm) materials: SGHC.
(1) The process requirements are as follows: the square tube adopts a reaming and sizing process, and the welding seam does not make a bending angle; n=4 is found according to the process requirements.
(2) Material performance requirements: the SGHC material 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 245MPa; n=3 is found according to the process requirements.
(3) When the two values of n are inconsistent, taking the maximum n=4 as a calculation coefficient,
substituting the formula w=a× 2+B ×2-nT.
W＝4×2.54×2+2×2.54×2－4×1.35＝25.08mm
The final product is as shown in figure 2, and has high yield and no black line on the surface.
The method for calculating the blanking opening degree of the hot-base thin galvanized pipe (square pipe) can stably produce hot-base galvanized products with the specification of 0.8-1.7mm, has good surface quality and stable performance and dimensional deviation, and can replace the current cold-base galvanized plates. On the basis of keeping the original functions, the method saves energy, reduces cost, realizes the upgrading and replacement of products in the industry, and has considerable social and economic benefits.
It is noted that while the present invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various modifications can be made therein without departing from the spirit and scope thereof.
Claims (3)
1. A design method for the blanking opening degree of a hot-base galvanized square pipe is characterized by comprising the following steps: the raw material is a hot-base galvanized sheet material, and the blanking opening degree W=A× 2+B ×2-nT; when cold bending high-frequency welding is directly carried out, and reaming is not carried out and sizing is not carried out, n is 1; when sizing is not reaming, n is 2; in the reaming and sizing processing technology, when a bending angle is formed at a welding line, n is 3; when the welding line does not make a bending angle, n is 4; wherein W is the opening degree of blanking; A. b is the length and width of the square tube section, a=b when the section is square; t is the wall thickness of the formed tube.
2. The method for designing the blanking opening degree of the heat-base galvanized square pipe according to claim 1, which is characterized in that: the strength of the hot-base galvanized sheet material is equal to or less than 235MPa, the yield strength Rel is 3, and if the yield strength Rel is more than 235MPa, the yield strength is 4.
3. The method for designing the blanking opening degree of the heat-base galvanized square pipe according to claim 2, which is characterized in that: and when the n assignment conflicts, n takes a larger value.
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| CN103909869B (en) * | 2014-04-03 | 2016-06-08 | 佛山市顺德区智辉金属制品实业有限公司 | A kind of automobile C type chute-type side thick stick pedal and Production Flow Chart thereof |
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| 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 |
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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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