CN115921575A - Manufacturing method of pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe - Google Patents
Manufacturing method of pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe Download PDFInfo
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- CN115921575A CN115921575A CN202211512460.3A CN202211512460A CN115921575A CN 115921575 A CN115921575 A CN 115921575A CN 202211512460 A CN202211512460 A CN 202211512460A CN 115921575 A CN115921575 A CN 115921575A
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Abstract
The invention discloses a manufacturing method of a pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe. It comprises the following steps of 1: heating the steel belt, and cleaning the anti-rust oil permeating into the surface of the steel belt; step 2: carrying out cold bending rough forming on the steel strip; and step 3: sealing and extruding the steel pipe subjected to cold bending and rough forming, performing extrusion welding on two welding edges through high-frequency welding to form a cold bending closed steel pipe, and removing outer burrs of a welding seam of the cold bending closed steel pipe; and 4, step 4: sizing, finishing and molding the cold-bent closed steel pipe with the outer burrs planed; and 5: straightening the welded cold-bent closed steel pipe; and 6: performing flying saw sawing on the straightened steel pipe; and 7: and (3) performing online surface oiling, air drying, packing after adding a spacer, draining off water offline, plastic packing and warehousing on the steel pipe. The invention improves the yield of the pickling-free cold-bending high-strength thin-wall trapezoidal steel pipe and reduces the waste loss of the product caused by difficult forming, poor surface quality and poor welding quality.
Description
Technical Field
The invention belongs to the technical field of cold-formed steel pipe manufacturing, and particularly relates to a manufacturing method of a pickling-free high-strength cold-formed thin-wall trapezoidal steel pipe.
Background
The pickling-free cold-bending high-strength thin-wall trapezoidal steel pipe product is applied to a chassis bracket of a passenger car (as shown in figure 1), and the product cancels a pickling process due to environmental protection requirements, and requires the steel pipe to be produced by using a pickled steel coil, but the surface of the pickled steel coil is not protected by iron scales, so that the surface is easy to scratch and rust. Therefore, the surface of the steel coil after pickling adopts a way of coating anti-rust oil; because the surface of the steel coil is provided with oil and is not protected by iron scales, oil stains on the surface can enter a circulating water tank of a rolling mill to cause the rolling mill to skid in the manufacturing process of the steel pipe, the stability of the rolling speed is poor, and the welding quality is influenced; in addition, the steel pipe can be scratched on the surface during the manufacturing process due to the non-scale protection. Meanwhile, the material has high tensile strength (more than or equal to 700 MP), thin wall thickness (less than 2.0 mm), aspect ratio of more than 2 and small forming angle (less than 70) of an R angle, so the forming is difficult; the above reasons result in such products having a yield of less than 90%.
The existing high-strength cold-bending steel pipe has moderate wall thickness (3-12 mm), centered welding seam, low material physical properties such as yield strength (235-600 MPa) and high elongation (more than or equal to 20 percent), thereby being convenient for cold-bending forming and welding. The acid-washing-free cold-bending high-strength thin-wall trapezoidal steel pipe has the problem that the rough forming, the welding and the finishing forming are difficult to control due to the particularity of high material strength, thin wall thickness, asymmetric shape and the like.
The pickling-free cold-bending high-strength thin-wall trapezoidal steel pipe needs to solve the quality problems of welding dislocation, welding missing and the like caused by the wave shape of the edge in the cold-bending forming process due to thin wall thickness and high strength; the problems of asymmetric shape, poor forming stability, small angle of a fillet, difficult solid bending and the like are also solved.
The acid-washing-free cold-bending high-strength thin-wall trapezoidal steel pipe adopts the high-strength steel belt with the surface free of oxidized iron sheets after acid washing as the raw material, and the surface of the steel belt is rust-proof and coated with rust preventive oil; however, after the rust preventive oil enters the rolling mill, rolling lubricating liquid in a circulating water tank is polluted, so that oil stains are adhered to the surface of the roller in the production process, the friction force between the roller and a steel strip is reduced, and the rolling mill slipping phenomenon is formed.
After the acid-washing-free cold-bending high-strength thin-wall trapezoidal steel pipe is formed, the surface of the steel pipe is easy to scratch due to the fact that the surface is not protected by iron scales, and the inner surface and the outer surface of the steel pipe can be corroded quickly to influence normal use.
Disclosure of Invention
The invention aims to solve the defects existing in the background technology and provide a method for manufacturing a pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe.
The technical scheme adopted by the invention is as follows: a manufacturing method of an acid-washing-free high-strength cold-bending thin-wall trapezoidal steel pipe comprises the following steps:
step 1: heating the steel belt, so that the rust-preventive oil on the surface of the pickled and oiled steel belt overflows and the overflowing rust-preventive oil on the surface of the steel belt is cleaned;
step 2: carrying out cold bending rough forming on the steel strip according to the overall dimension of the pickling-free cold-bending high-strength thin-wall trapezoidal steel pipe;
and step 3: sealing and extruding the steel pipe subjected to cold bending rough forming, performing extrusion welding on two welding edges through high-frequency welding to form a cold bending closed steel pipe, and removing outer burrs of a welding seam of the cold bending closed steel pipe;
and 4, step 4: sizing, finishing and molding the cold-bent closed steel pipe with the outer burrs planed;
and 5: straightening the welded cold-bent closed steel pipe;
step 6: performing flying saw sawing on the straightened steel pipe;
and 7: and (3) performing online surface oiling, air drying, packing after adding a spacer, draining off water offline, plastic packing and warehousing on the steel pipe.
In the step 1, the steel strip is heated by a thermoelectric heater.
And in the step 1, cleaning the anti-rust oil on the surface of the heated steel belt by adopting a wool felt clamping pad.
In the step 2, the cold bending coarse forming comprises first bending forming, second bending forming and sealing forming; in the first to third frame one-time bending forming process, the forming angle of each frame one side is 30 degrees, 40 degrees and 45 degrees in sequence, in the fourth to seventh frame two-time bending forming process, the forming angle of each frame one side is 20 degrees, 35 degrees, 50 degrees and 60 degrees in sequence, in the eighth to tenth closed forming process, the forming angle of each frame one side is: the bottom angles are 70 degrees, 80 degrees and 86 degrees in sequence; the welding corners are 70 degrees, 75 degrees and 82 degrees in sequence; in the first to third frame one-time bending forming process, the forming angle of the other side of each frame is 30 degrees, 40 degrees and 50 degrees in sequence, in the fourth to seventh frame two-time bending forming process, the forming angle of the other side of each frame is 20 degrees, 35 degrees, 50 degrees and 68 degrees in sequence, in the eighth to tenth sealing forming process, the forming angle of the other side of each frame is: the bottom angles are 86 degrees, 100 degrees and 110 degrees in sequence; the welding corner angles are 62 degrees, 62 degrees and 62 degrees in sequence.
And the sixth and seventh secondary lower rolls adopt bearing rolls, and the roll and the shaft of the bearing roll are matched by adopting a bearing. The steel pipe is passively rotated in the rolling process, so that the surface of the steel pipe cannot be scratched.
In the step 3, the steel pipe subjected to cold bending and rough forming is subjected to closed extrusion through an upper extrusion roller and two side extrusion rollers; the upper squeeze roll adopts a vertical radian roll, so that the welding stability of two welding edges during butt welding is convenient to control, and because of the asymmetry of two sides of the steel pipe, the two side squeeze rolls adopt box-type rolls, one side of the box-type rolls is embedded, so that the steel pipe is tightly wrapped during welding, and the welding stability is prevented from being influenced by the shaking of the steel pipe.
And 4, performing sizing and finishing molding in a four-roller arc wrapping molding mode. The size precision of the steel pipe can meet the standard requirement, and particularly, the arc wrapping forming of the bevel edge small arc ensures the accuracy of the arc value.
And 3, adopting a blade with radian to remove the burrs on the outer sides of the two welded sides.
And 7, coating oil on the surface of the steel pipe and air-drying the steel pipe by using a water hanging plate, an oil scraping plate, a rust oil blowout prevention device and a compressed air blowing pipe.
In the step 2, the cold-bending rough forming is performed by cooling and lubricating the rolling lubricating liquid with the antirust function.
The invention solves the quality problems of welding dislocation, welding missing and the like caused by the wave shape of the edge in the forming process of the pickling-free cold-bending high-strength thin-wall trapezoidal steel pipe, and influences the stability of the welding quality;
the invention solves the problems of asymmetric shape, poor forming stability, small angle of a fillet and difficult real bending;
the invention solves the problems that the rolling machine slips and scratches the surface of the steel pipe due to the fact that the rolling lubricating liquid in a circulating water tank is polluted after the rust preventive oil on the surface of the steel belt enters the rolling machine, and meanwhile, the problems that the rolling speed is large in jumping, the high-frequency welding is unstable, and welding seam blowholes and cracks are formed are also caused;
the invention solves the problems that the surface of the steel pipe is easy to scratch and the inner and outer surfaces are quickly corroded due to no oxide scale protection on the surface after the steel pipe is formed.
The invention has the following beneficial effects:
(1) Simulating each frame of forming roller flower by adopting special COPRA software: the forming angle, the fillet and the forming center are accurately designed, the accuracy of the steel pipe forming process is guaranteed, and the problems that the asymmetric forming is easy to generate bending and twisting and the size accuracy is poor are solved.
(2) The method adopts the edge minimum strain descent method in the special COPRA software, calculates the descent amount of each frame, and solves the problem that the welding quality is influenced by uneven extension of the formed edge and wave shape caused by thinner wall thickness and higher strength of the steel strip.
(3) The steel belt surface antirust oil is removed by adopting the baking and surface cleaning device, and the adverse effect of the steel belt self antirust oil on the production of the cold-bending steel pipe is solved (the antirust oil enters a circulating water tank, so that a rolling mill slips, the rolling speed fluctuates, the welding quality is unstable, and the steel pipe surface scratch caused by the roller is easy to occur due to the fact that the speed difference between the steel pipe and the rolling mill is formed by slipping).
(4) The key frame is that the linear speed of the lower roller is inconsistent with the rolling mill if the forming angle is larger, so that the surface of the steel pipe which is free from scale protection after acid washing is easily scratched.
(5) Carrying out extrusion molding on the steel belt subjected to the closed molding by adopting a three-roller type extrusion roller, finally carrying out closed molding on two welding edges, and forming a closed hole type steel pipe after finishing high-frequency welding by extrusion; the upper extrusion roller adopts a vertical roller with radian, so that the stability of the two welding edges during welding and butt welding can be conveniently controlled; due to the asymmetry of the two sides of the steel pipe, the two side extrusion rollers adopt box-type rollers, one side of the box-type rollers is embedded, the steel pipe is conveniently wrapped tightly during welding, and the welding stability is prevented from being influenced by the shaking of the steel pipe.
(6) The problem of quality of R cracks caused by the fact that the outer circular arc of the bevel edge is easy to deform in the sizing and finishing forming process is solved by adopting sizing and finishing forming (the outer circular arc of the bevel edge is formed in an arc wrapping mode).
(7) The online oil coating and air drying device is adopted, so that the problem that the surface of the pickling-free steel pipe is easy to rust due to the fact that the surface is protected by no iron scale is solved, and the problems of uneven oil coating, heavy oil and oil accumulation are solved.
After the method is implemented, the yield of the pickling-free cold-bending high-strength thin-wall trapezoidal steel pipe is improved, the waste loss of the product caused by difficult forming, poor surface quality and poor welding quality is reduced, the annual production and sales volume is about 2000 tons, and the benefit is 60 ten thousand yuan per year.
Drawings
FIG. 1 is a cross-sectional view of a prior art steel pipe;
FIG. 2 is a sectional view of the acid-washing-free cold-bending high-strength thin-wall trapezoidal steel pipe of the invention;
FIG. 3 is a schematic diagram of the rough forming process of the acid-washing-free cold-bending high-strength thin-wall trapezoidal steel tube of the invention;
FIG. 4 is a schematic view of the pickling-free cold-bending high-strength thin-walled trapezoidal steel pipe of the present invention adopting the edge minimum strain downhill method;
FIG. 5 is a schematic diagram of an extrusion welding process of the pickling-free cold-bending high-strength thin-wall trapezoidal steel pipe of the invention;
FIG. 6 is a schematic diagram of the sizing and finishing forming of the pickling-free cold-bending high-strength thin-wall trapezoidal steel pipe of the invention;
FIG. 7 is a schematic view of baking and cleaning the surface of the acid-washing-free cold-bending high-strength thin-wall trapezoidal steel strip of the invention;
FIG. 8 is a schematic drawing showing that the surface of the pickling-free cold-bending high-strength thin-wall trapezoidal steel pipe is oiled and air-dried;
FIG. 9 is a schematic view of a single-bending forming process of the pickling-free cold-bending high-strength thin-wall trapezoidal steel strip of the present invention;
FIG. 10 is a two-bending forming process diagram of the pickling-free cold-bending high-strength thin-wall trapezoidal steel strip of the invention;
FIG. 11 is a schematic diagram of the closed forming process of the pickling-free cold-bending high-strength thin-wall trapezoidal steel strip.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
The whole process flow of the invention comprises: the method comprises the following steps of uncoiling → feeding → shearing → butt welding → baking → surface cleaning → rough forming (343 asymmetric forming mode) → extrusion welding (high-frequency welding) → outer weld planing → cooling, lubricating → sizing finishing forming → straightening and shaping → flying saw sawing → oiling, air drying → packing and collecting → draining → plastic bag warehousing.
The method specifically comprises the following steps:
(a) Conveying a steel belt B (shown in figure 2) with a certain width calculated according to the verification to a material guiding vertical roll through uncoiling, feeding, shearing and butt welding and pinch roll clamping, baking by a thermoelectric heater 2-1 to facilitate overflow of rust preventive oil permeating into the steel belt B, and cleaning the surface of the heated steel belt B by a wool felt clamping pad 2-2 (shown in figure 7); the adverse effect of the self-contained anti-rust oil of the steel belt B on the production of the cold-bending steel pipe is solved (the anti-rust oil enters a circulating water tank to cause the rolling mill to slip, so that the rolling speed fluctuates, the welding quality is unstable, the speed difference between the steel pipe and the rolling mill is formed due to the slip, and the surface of the steel pipe is easily scratched by a roller).
(b) Checking and calculating widening, a forming central line, a forming angle, an arc value and a forming pass, and designing, simulating and optimizing key process parameters of a cold bending forming pass, a forming angle of each pass, an overbending amount, a descending amount and the like of a steel strip B by adopting professional analysis software according to the overall dimension of the pickling-free cold bending high-strength thin-wall trapezoidal steel pipe A to obtain the optimal forming parameters of the cold bending forming pass and each pass; performing cold bending deformation according to the molding pass and the optimal molding parameters until the optimal parameter values before welding are reached, and finishing coarse molding; in the production process, rolling lubricating liquid with an antirust function is adopted for cooling and lubricating.
In this embodiment: designing each frame forming roll flower pattern (shown in figure 3) by taking the centroid vertical line of the section of the steel pipe A as a central line, and simulating each frame forming roll flower (shown in figure 3) by adopting special COPRA software: the forming angle, the fillet and the forming center are accurately designed, the accuracy of the steel pipe forming process is guaranteed, and the problems that the asymmetric forming is easy to generate bending and torsion and the size accuracy is poor are solved. The method for lowering the mountain with the minimum edge strain in the COPRA software (shown in figure 4) is adopted, the quantity of lowered mountain of each frame is calculated, and each frame forming is carried out, so that the problem of poor forming stability caused by asymmetric forming is solved, and the problem that welding quality is influenced by uneven extending of the forming edge and wave shape caused by thin wall thickness and high strength of a steel strip B is solved.
Through 343 asymmetric shaping mode rough forming (first bending shaping, second bending shaping, closed shaping, see fig. 9-11), as shown in fig. 3-4, in the first bending shaping process to the third bending shaping process, the shaping angle of each frame is 30 ° (30 °), 40 ° (40 °), 45 ° (50 °); in the second bending molding process from the fourth frame to the seventh frame, the molding angles of each frame are 20 degrees (20 degrees), 35 degrees (35 degrees), 50 degrees (50 degrees) and 60 degrees (68 degrees) in sequence.
Roll forming "closed forming": in the cold roll forming process from the eighth pass to the tenth pass (8-10), the forming angle of each pass is as follows: the base angles are 70 degrees (86 degrees), 80 degrees (100 degrees) and 86 degrees (110 degrees) in sequence; the welded corners were 70 ° (62 °), 75 ° (62 °), and 82 ° (62 °), in this order.
In the embodiment, key times (six or seven forming times) are provided, for example, the forming angle is larger, the linear speed of the lower forming roller 1-3 is inconsistent with that of a rolling mill, so that the surface of the steel pipe which is free of scale protection after pickling is easily scratched, the lower roller 1-3 is designed to adopt the bearing roller 1-5 (shown in figure 10), and the bearing roller 1-5 is passively rotated in the rolling process due to the fact that the bearing roller is matched with the shaft, so that the surface of the steel pipe cannot be scratched.
The method comprises the following steps of (1) extrusion and welding molding: carrying out extrusion high-frequency welding on the two side ends after the rough forming is closed through an extrusion roller, carrying out extrusion forming on the steel belt B subjected to the closed forming by adopting a three-roller extrusion roller (shown in figure 5), finally carrying out closed forming on two welding edges, and forming a closed hole type steel pipe A after the high-frequency welding is completed through the extrusion; wherein, the upper squeeze roll 1-1-1 adopts a vertical roller with radian, which is convenient for controlling the stability of two welding edges during welding butt welding; due to the asymmetry of two sides of the steel pipe A, the two side extrusion rollers 1-2-1 adopt box-type rollers, and one side of the box-type rollers is embedded, so that the steel pipe A is conveniently wrapped tightly during welding, and the welding stability is prevented from being influenced by the shaking of the steel pipe A.
(c) And 'outer weld joint planing': and (3) removing outer burrs on two welding side edges of the extruded and welded steel pipe A by using a blade with a radian for forming outer welding seams 1-4 on the two welding side edges of the extruded and welded steel pipe A, so as to ensure that the welding surface is flat and smooth.
(d) "cooling, lubrication": spray pipes are adopted to spray aqueous rust-proof rolling lubricating liquid on the surfaces of rollers in contact with the steel pipe A every time in the forming process, so that the rolling stability is guaranteed on one hand, and the rust prevention on the surface of the steel pipe A is guaranteed on the other hand.
(e) Sizing and finishing molding: the sizing, finishing and forming are carried out by adopting a four-roller (comprising an upper roller 1-1, two side rollers 1-2 and a lower roller 1-3) arc wrapping forming mode (shown in figure 6), so that the size precision of the steel pipe A can meet the standard requirement, and particularly the arc wrapping forming of the bevel edge small arc ensures the precision of the arc value.
(f) And straightening and correcting: and straightening and shaping the steel pipe A subjected to sizing and finishing molding to ensure that the longitudinal straightness of the steel pipe A meets the requirements of customer standards.
(g) And sawing by using a flying saw: and the steel pipe A is subjected to flying saw cutting by adopting saw cleaning and cutting equipment, so that the requirement of a customer on the fixed length is met.
(h) Coating oil and collecting plastic bags: and (2) performing surface oiling, air drying, packing after adding a spacer, draining off the line, plastic wrapping and warehousing on the steel pipe A by adopting an online oiling and air drying device (comprising a water hanging plate 3-1, an oil scraping plate 3-2, an anti-spray rust oil device 3-3 and a compressed air blowpipe 3-4, as shown in figure 8, wherein the X direction is the rolling direction).
Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. The manufacturing method of the pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe is characterized by comprising the following steps of: the method comprises the following steps:
step 1: heating the steel belt, so that the rust-preventive oil on the surface of the pickled and oiled steel belt overflows and the overflowing rust-preventive oil on the surface of the steel belt is cleaned;
and 2, step: carrying out cold bending rough forming on the steel strip according to the overall dimension of the pickling-free cold-bending high-strength thin-wall trapezoidal steel pipe;
and step 3: sealing and extruding the steel pipe subjected to cold bending rough forming, performing extrusion welding on two welding edges through high-frequency welding to form a cold bending closed steel pipe, and removing outer burrs of a welding seam of the cold bending closed steel pipe;
and 4, step 4: sizing, finishing and molding the cold-bent closed steel pipe with the outer burrs planed;
and 5: straightening the welded cold-bent closed steel pipe;
step 6: performing flying saw sawing on the straightened steel pipe;
and 7: and (3) performing online surface oiling, air drying, packing after adding a spacer, draining off water offline, plastic packing and warehousing on the steel pipe.
2. The method for manufacturing the pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe according to claim 1 is characterized in that: in the step 1, the steel strip is heated by a thermoelectric heater.
3. The method for manufacturing the pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe according to claim 1 is characterized in that: and in the step 1, cleaning the anti-rust oil on the surface of the heated steel belt by adopting a wool felt clamping pad.
4. The method for manufacturing the pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe according to claim 1 is characterized in that: in the step 2, the cold bending coarse forming comprises first bending forming, second bending forming and sealing forming; in the first-third-frame first bending forming process, the forming angle of each frame is 30 degrees, 40 degrees and 45 degrees in sequence, in the fourth-seventh-frame second bending forming process, the forming angle of each frame is 20 degrees, 35 degrees, 50 degrees and 60 degrees in sequence, and in the eighth-tenth-frame closed forming process, the forming angle of each frame is one side: the bottom angles are 70 degrees, 80 degrees and 86 degrees in sequence; the welding corner is 70 degrees, 75 degrees and 82 degrees in sequence; in the first to third frame one-time bending forming process, the forming angle of the other side of each frame is 30 degrees, 40 degrees and 50 degrees in sequence, in the fourth to seventh frame two-time bending forming process, the forming angle of the other side of each frame is 20 degrees, 35 degrees, 50 degrees and 68 degrees in sequence, in the eighth to tenth sealing forming process, the forming angle of the other side of each frame is: the bottom angles are 86 degrees, 100 degrees and 110 degrees in sequence; the welding corner angles are 62 degrees, 62 degrees and 62 degrees in sequence.
5. The method for manufacturing the pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe as claimed in claim 4, wherein the method comprises the following steps: and the sixth and seventh secondary lower rolls adopt bearing rolls, and the roll and the shaft of the bearing roll are matched by adopting a bearing.
6. The method for manufacturing the pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe according to claim 1 is characterized in that: in the step 3, the steel pipe subjected to cold bending and rough forming is subjected to closed extrusion through an upper extrusion roller and two side extrusion rollers; wherein, the upper extrusion roll adopts a vertical radian-carrying roll, the two side extrusion rolls adopt box-type rolls, and one side of the box-type rolls is embedded.
7. The method for manufacturing the pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe according to claim 1 is characterized in that: and 4, performing sizing and finishing molding in a four-roller arc wrapping molding mode.
8. The manufacturing method of the pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe as claimed in claim 1, which is characterized in that: and 3, adopting a blade with radian to remove the burrs on the outer sides of the two welded sides.
9. The method for manufacturing the pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe according to claim 1 is characterized in that: and 7, oiling and air-drying the surface of the steel pipe by adopting a water hanging plate, an oil scraping plate, a rust oil spraying prevention device and a compressed air blowing pipe.
10. The manufacturing method of the pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe as claimed in claim 1, which is characterized in that: in the step 2, the cold-bending rough forming is performed by cooling and lubricating the rolling lubricating liquid with the antirust function.
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|---|---|---|---|
| CN202211512460.3A CN115921575A (en) | 2022-11-28 | 2022-11-28 | Manufacturing method of pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe |
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| CN202211512460.3A CN115921575A (en) | 2022-11-28 | 2022-11-28 | Manufacturing method of pickling-free high-strength cold-bending thin-wall trapezoidal steel pipe |
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