CN1177656C - Manufacturing method of square steel tube and round steet tube - Google Patents
Manufacturing method of square steel tube and round steet tube Download PDFInfo
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- CN1177656C CN1177656C CNB001270524A CN00127052A CN1177656C CN 1177656 C CN1177656 C CN 1177656C CN B001270524 A CNB001270524 A CN B001270524A CN 00127052 A CN00127052 A CN 00127052A CN 1177656 C CN1177656 C CN 1177656C
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Abstract
A manufacturing method of square steel tube and round steel tube is disclosed. In the square steel tube manufactured using the cold roll forming in the prior art, the rigidity of the corner part and the welding seam part are higher than that of the panel, the yield point does not appear, the drawing and compressing residual stress close to the yield point is generated at the corner part and the welding seam part to reduce the buckling strength, the tenacity deformation large in the local may remain at the corner part because of the bending work and the development of brittlement is remarkable. To this end, in the invention, because the square steel tube is manufactured in a heat roll forming using the square steel tube forming rolls, the materials is even-softened on the whole fracture surface, the stretching performance is good, and high buckling strength almost without residual stress is obtained, while the square steel tube with enough tenacity and good secondary welding performance is manufactured.
Description
Technical field
The invention relates to the rectangular steel tube manufacture method that is adopted as heavy caliber square steel tubes such as the square of building post material or cuboids the time in Production Example, and the round steel pipe manufacture method that when making the heavy caliber round steel pipe of same purposes, is adopted.
Background technology
In the past, be to make with the manufacture method seen in the Japanese Patent Publication 58-13245 communique for example as the heavy caliber square steel tube of building post material etc.Promptly, in this method in the past, be a thick steel sheet is carried along its length and to be processed groove in its both sides, be equivalent to the part of four jiaos of rectangular steel tubes and make it to become approximate rectangular steel tube with the forcing press bending, make it become the shape of rectangular steel tube gradually by the forming rolls of a plurality of series again, the groove interface is positioned weldering successively, after by automatic welding the about face of its groove part being welded, carry out straightening and obtain the heavy caliber square steel tube.
Heavy caliber rectangular steel tube with above-mentioned cold roll forming manufacturing, from the exterior side hardness scatter chart of the inside side hardness scatter chart of for example Fig. 5 and Fig. 6 as can be known, the hardness of its bight and weld seam is much larger than the hardness number of flat part (mother metal), therefore, will cause the yield strength of bight and welding seam part to become big, the ductility step-down, and carrying out the risk of crack that happen occasionally such as secondary welding, so need special management, again owing to the inhomogeneous residual stress that produces of engineering properties, so also be difficult for carrying out machining etc.
In addition, as heavy caliber rectangular steel tube in the past, from the curve comparison diagram of tensile stress-elongation strain shown in Figure 7 as seen, though wherein bight, welding seam part and flat part all do not appear yield point, but often taking place in the works of local stress distribution, maximum yield ratio surpasses at 80% o'clock, and the danger of the local elongation ability drop that makes works is just arranged.
And then in heavy caliber square steel tube in the past, especially in its bight with welding seam part produced near yield point draw, press residual stress, make its buckling strength reduction.Thereby, when welding, cutting off processing or molten zinc plating processing etc., with regard to having generation the danger that crackle maybe can not be controlled distortion takes place along with the release of these residual stress.
So, when the heavy caliber square steel tube that adopts in the past, for example as seen from the inversion cuver figure of Fig. 8, especially in the bight, owing to bigger local plastic deformation, the embrittlement significantly of this position are arranged because of bending machining is residual, conversion temperature can cause brittle break considerably beyond normal temperature in the low temperature field.
Summary of the invention
The purpose of this invention is to provide and a kind ofly make whole cross section softening in heterogeneity, good tensile property is arranged, have residual stress hardly and the manufacture method of rectangular steel tube of enough toughness and the manufacture method of round steel pipe are arranged.
The present invention also aims to provide a kind of rectangular steel tube manufacture method, it is shaped in the hot forming mode, can reduce the press molding number of times, does not need the end bending machine, and good yield rate is arranged, and its bight radius of curvature (R) can be extruded into setting firmly.
And then, the present invention also aims to provide a kind of, with the manufacture method of the rectangular steel tube that obtains good yield rate the hot forming of base pipe.
In order to achieve the above object, the feature of rectangular steel tube manufacture method of the present invention is, the round billet pipe of the specified diameter that use and final products size match, thickness of slab, length, in heating furnace, be heated, with the round steel pipe forming rolls base pipe after heating is carried out the hot forming of pull and stretch shape again, form refining base pipe, in the rectangular steel tube forming rolls, will make with extra care the base pipe then and be thermoformed into rectangular steel tube, this rectangular steel tube is cooled off on cooling bench.
Adopt above-mentioned structure of the present invention, hot forming on the round steel pipe forming rolls, just can make the refining base pipe of finishing the last desired diameter of rectangular steel tube given size, again refining base pipe is thermoformed into rectangular steel tube on the rectangular steel tube forming rolls, carrying out hot forming in this wise just can obtain on whole section softening in heterogeneity, good draftability is arranged, thereby exist residual stress to obtain high buckling strength hardly, just can produce the secondary welding excellence, and the rectangular steel tube that enough toughness is arranged, thereby can provide the rectangular steel tube that is particularly suitable for as post material for building.
In the 1st most preferred embodiment of the present invention, it is characterized in that, form the polygonal hollow steel tube welding behind the plate blank press molding, be placed on and heat in the heating furnace, be thermoformed into rectangular steel tube with the rectangular steel tube forming rolls.
In this 1st embodiment, the number of times (pressure rolling number of times) that is shaped with compression molding press is for obtaining polygonal hollow tube at least, this shaping is (short time) and realize economically rapidly, can also not use the end bending machine, cost of equipment is reduced, simultaneously since do not need the end bending operation can make production line simple in structure, save trouble.
In the 2nd most preferred embodiment of the present invention, form its width dimensions polygonal hollow steel tube wideer, while and the polygonal hollow steel tube after the heating in heating furnace is carried out pull and stretch with the rectangular steel tube forming rolls carry out hot forming than final products size.
In this 2nd embodiment, by in the rectangular steel tube forming rolls, carrying out pull and stretch and hot forming simultaneously, can produce the rectangular steel tube that from the front end to the rear end, fully is configured as given size, and need not to cut leading section and rearward end in the operation in the back, as long as or it is just passable to cut short size, and good yield rate is arranged.
In the 3rd most preferred embodiment of the present invention, the polygonal hollow steel tube that formation is wideer than the width of final products size, the bight radius of curvature is bigger, and the polygonal hollow steel tube after will in heating furnace, heating, with the rectangular steel tube forming rolls its width dimensions and bight radius of curvature are carried out pull and stretch and hot forming simultaneously and form.
The radius of curvature that makes the bight with forcing press among this 3rd embodiment is shaped than the bight radius of curvature of final products biglyyer, thereby pressure forming exceedingly just can easily realize to the flat blank material.Like this, heat polygonal hollow steel tube that its material (molecules align) restores by high temperature and just make that its width dimensions narrows down, the bight radius of curvature diminishes by the hot-drawn Deep forming, thereby under the situation that does not change its material, can obtain the high final products of section factor, promptly obtain the rectangular steel tube that across corner radius of curvature and width do not carry out the strong rolling size that conforms with the regulations.
The 4th most preferred embodiment of the present invention, it is characterized in that, form the polygonal hollow steel tube bigger with rectangular steel tube forming rolls cold roll forming round billet pipe than final products width dimensions, in heating furnace,, obtain rectangular steel tube with the pull and stretch hot forming on one side on one side of other rectangular steel tube forming rolls again to after this polygonal hollow steel tube heating.
In this 4th embodiment, owing to be base pipe cold roll forming on the rectangular steel tube forming rolls, thereby can form the polygonal hollow steel tube bigger than the width dimensions of final products, after should polygonal hollow steel tube in heating furnace, carrying out the high temperature heating, use the pull and stretch hot forming on one side on one side of other rectangular steel tube forming rolls again, so can produce the rectangular steel tube that from the leading section to the rearward end, all forms given size fully.Thereby, can not be used in the operation of back excision leading section and rearward end, or cut shorter size and get final product, and good yield rate is arranged.
The 5th most preferred embodiment of the present invention, be to form width dimensions broad, polygonal hollow steel tube that the angle radius of curvature is bigger, it is hot formed that the polygonal hollow steel tube that will heat in heating furnace carries out pull and stretch one side, one side with other rectangular steel tube forming rolls to its width dimensions and bight radius of curvature.
In this 5th embodiment, it is bigger than the bight radius of curvature of final products that the radius of curvature in bight is formed, and can easily not carry out the cold roll forming from the base pipe to polygonal hollow steel tube tough.Carrying out the polygonal hollow steel tube hot-drawn Deep forming that material (molecules align) is restored by the high temperature heating, its width dimensions is narrowed down, the bight radius of curvature diminishes, under the situation that does not change material, just can obtain the high final products of section factor, promptly need not roll the radius of curvature in bight and width firmly and the rectangular steel tube of the size that can obtain conforming with the regulations.
The 6th most preferred embodiment of the present invention, it is characterized in that, use the round billet pipe that specified diameter, thickness of slab, length are arranged that matches with the final products size, this base pipe is heated in heating furnace, on the round steel pipe forming rolls, be thermoformed into round steel pipe adding overheated base pipe again, on the cooling bench after the round steel pipe cooling, excise its end formed bad part with shearing device again and form.
In this 6th embodiment,, just can produce the round steel pipe of specified diameter, thickness of slab and length add overheated base pipe hot forming on the round steel pipe forming rolls at heating furnace.Carry out such hot rolling be shaped just can produce that material is softened on the whole section, tensile property is good, thereby and almost there is not residual stress to obtain high buckling strength, the round steel pipe that also have the secondary welding characteristic good simultaneously, has enough toughness can provide the round steel pipe that is particularly suitable for doing post material for building.
Description of drawings
Fig. 1 represents the 1st embodiment of the present invention, is the operation stereogram till the hot forming in the rectangular steel tube manufacture method.
Fig. 2 is the postprocessing working procedures stereogram of Fig. 1 rectangular steel tube manufacture method.
Fig. 3 is the flushing operation stereogram of Fig. 1 rectangular steel tube manufacture method.
Fig. 4 is the rectangular steel tube with the manufacturing of Fig. 1 rectangular steel tube manufacture method, and A is cooled front elevation for the back that is shaped, B.
Fig. 5 is and past product the inside side hardness scatter chart relatively.
Fig. 6 is the hardness scatter chart with past product exterior side relatively.
Fig. 7 is and past product tensile stress-elongation strain curve comparison diagram relatively.
Fig. 8 is and past product transition curve figure relatively.
Figure 24 is the vertical profile front elevation of heating furnace part in Figure 22 rectangular steel tube manufacture method.
Figure 25 is the immigration notch portion vertical profile side view of heating furnace in Figure 22 rectangular steel tube manufacture method.
Figure 26 is the key diagram during ascending motion in Figure 22 rectangular steel tube manufacture method.
Figure 27 is the key diagram during setback in Figure 22 rectangular steel tube manufacture method.
Figure 28 is the key diagram during descending motion in Figure 22 rectangular steel tube manufacture method.
Figure 29 represents the 11st embodiment of the present invention, is the vertical profile side view of the immigration notch portion of heating furnace in the rectangular steel tube manufacture method.
The specific embodiment
Though in following each embodiment, serve as main the narration with heavy caliber rectangular steel tube and round steel pipe manufacture method, with it equally also can make medium caliber or small-bore square or round steel pipe.
Below, according to Fig. 1～Fig. 8 the 1st embodiment of the present invention is described.
Shown in Fig. 1 when making the heavy caliber rectangular steel tube, in the situation of the base pipe (female pipe) 1 that moves into the round steel pipe of getting the diameter that regulation is arranged that matches with this rectangular steel tube, wall thickness, length on the platform 10 ready.Base pipe 1 usefulness high-frequency welding or arc welding etc. have welding seam part 2 states to make, also can be with seamless base pipe 1.Moving into platform 10 is the conveyer form, and it is being supported many base pipes 1 in parallel to each other, to carry with respect to the rectangular direction of its length direction.
Be transported to the base pipe 1 that moves into platform 10 terminal parts and reprint on the roller conveyor formula heating part conveyer 11, and carry along the length direction of pipe.Then, base pipe 1 is sent in the heating furnace 12, carried out the high temperature heating with the temperature of 723 ℃～950 ℃ (more than the A3 transformation temperatures) in the course of conveying in this heating furnace 12.Base pipe 1 is sent into heating furnace 12 successively, makes this moment to keep L at interval between the end face of base pipe 1, and base pipe 1 elongation or transporting velocity difference make its end face be in contact with one another (conflict) when preventing because of heating.When L is excessive at interval, imitate
Fig. 9 represents the 2nd embodiment of the present invention, is the stereogram till the hot forming operation in the round steel pipe manufacture method.
Figure 10 represents the 3rd embodiment of the present invention, is the operation stereogram of rectangular steel tube manufacture method.
Figure 11 is the specification figure of Figure 10 rectangular steel tube manufacture method.
Figure 12 is the welding key diagram of Figure 10 rectangular steel tube manufacture method.
Figure 13 represents the present invention the 4th embodiment, is rectangular steel tube manufacture method specification figure.
Figure 14 welds key diagram in Figure 13 rectangular steel tube manufacture method.
Figure 15 represents the present invention the 5th embodiment, is rectangular steel tube manufacture method specification figure.
Figure 16 represents the present invention the 6th embodiment, is the stereogram of rectangular steel tube manufacture method operation.
Figure 17 is the specification figure of Figure 16 rectangular steel tube manufacture method.
Figure 18 represents the present invention the 7th embodiment, is rectangular steel tube manufacture method specification figure.
Figure 19 represents the present invention the 8th embodiment, is rectangular steel tube manufacture method operation stereogram.
Figure 20 is Figure 19 rectangular steel tube manufacture method specification figure.
Figure 21 represents the present invention the 9th embodiment, is rectangular steel tube manufacture method specification figure.
Figure 22 represents the present invention the 10th embodiment, is rectangular steel tube manufacture method operation perspective illustration.
Figure 23 is the vertical profile side view of heating furnace part in Figure 22 rectangular steel tube manufacture method.Rate can reduce, thereby should be controlled at interval L below the 500mm.
The base pipe 1 that is heated to set point of temperature is shifted out heating furnace 12, move to position while welding adjusting device 15 again, this position while welding adjusting device 15 is made of backing roll 16 and pressure roller 17 grades, with these rollers 16,17 base pipe 1 is rotated around the axis of pipe, and the aligned in position that makes welding seam part 2 is on certain orientation, so-called this certain direction is that welding seam part 2 is positioned near the planar portions central authorities.The part by this position while welding adjusting device 15 then when carrying seamless base pipe 1, and, then can cancel operation with position while welding adjusting device 15 in the occasion of only using seamless base pipe 1.
Necessary position around round steel pipe forming rolls 20 (in the front and back of round steel pipe forming rolls 20 or only preceding, only in the back, between board etc.) descaling device 23 of requirement is set.This descaling device 23 is the devices to the water of refining base pipe 1A jet band pressure, removes mill scale etc. to obtain surface of good by injection water.
Hot formed like this rectangular steel tube 3 is delivered on the cooling bench 28 from heating part conveyer 11.This cooling bench 28 is the conveyer form, is supporting many rectangular steel tubes 3 abreast, and transmits them on the transverse direction with respect to the length direction of pipe.Rectangular steel tube 3 is cooled off gradually in the air cooling mode in transmitting with cooling bench 28.Be rectangular steel tube 3 slow cooling under same encirclement gas temperature, so the flexural deformation when cooling is less, by slow cooling, each flat part of rectangular steel tube 3 shrinks, and makes the arc surface shown in Fig. 4 B become straight plane, and the R of bight 3b is diminished, and section factor improves.
3 groups of the rectangular steel tubes that on cooling bench 28, transmits, be so that the apart state of adjacent rectangular steel tube 3 down or make adjacent rectangular steel tube 3 be in contact with one another to transmit down from the state of sandwich.Make rectangular steel tube 3 slowly cooling under identical atmosphere temperature thus, the bending when reducing to cool off.
The rectangular steel tube 3 that arrives cooling bench 28 terminals forwards on the 1st conveyer 29 of roller conveyor formula, and transmits along the length direction of pipe.Then, rectangular steel tube 3 is sent into apparatus for correcting 30 as illustrated in fig. 2, correct in the bending that the macrobending of this length direction that cooling the time is produced surpasses more than a reference value.And for the rectangular steel tube 3 that does not surpass a reference value, can pass through from apparatus for correcting 30, also can all correct with apparatus for correcting 30.
Passed through the rectangular steel tube 3 of apparatus for correcting 30 and transferred on the roller path way station 32 from the 1st conveyer 29, and in the transversely transmission with respect to the length of tube direction.The rectangular steel tube 3 that arrives these way station 32 terminals is received by the 2nd roller path 33, and transmits along the length direction of pipe.Rectangular steel tube 3 in the transmission cuts the bad part of front end (end) shaping that is produced by front end shearing device 35 earlier when being shaped, cut rear end (other end) the not good part that is shaped by rear end shearing device 36 again, thereby obtain given size and along the good rectangular steel tube of its total length precision (final products) 3.
Then rectangular steel tube 3 is moved on on the 3rd conveyer 44 of roller path form from scouring table 38, and transmit along the length direction of pipe.Rectangular steel tube 3 in the transmission carries out antirust processing by Rustproofing apparatus 45, so that its unlikely getting rusty when preserving or use, move on to rectangular steel tube 3 on the output table 46 of roller path formula from the 3rd conveyer 44 then, with respect in transversely the transmitting of the length direction of pipe, make its dense arrangement.
Above-mentioned passing through is thermoformed into the heavy caliber rectangular steel tube 3 that square tube manufactures to pipe, it is the rectangular steel tube of hot forming, inner face side hardness scatter chart from Fig. 5 for example, the exterior side hardness scatter chart among Fig. 6 as can be known, its flat part 3a, bight 3b, welding seam part 2 etc. almost are uniform along the engineering properties of whole section.Thereby because the yield strength step-down of bight 3b and welding seam part 2, ductility increases, so need not to carry out special processing the such as secondary welding, again owing to the engineering properties uniformity, machining etc. is also carried out easily.
And when using hot formed rectangular steel tube, as seen, yield point all appears in its flat part 3a, bight 3b and welding seam part 2 from the tensile stress-strain curve comparison diagram of for example Fig. 7, and yield ratio is far below 80% of standard value, and stable, enough tensile properties are arranged.Thereby, as the place that local stress distributes often takes place, during post material for example for building, reduced the danger of brittle break, particularly have characteristic as the ideal material of the post material for building of desirable vibration strength.
And then when the hot forming rectangular steel tube, flat part 3a, bight 3b, places such as welding seam part 2 almost completely do not exist stretching and compressive residual stress, thereby can obtain high buckling strength.Thereby, carrying out welding processing, when cutting off technology such as processing or molten zinc plating, crackle and uncontrollable distortion can not take place.
Hot formed like this rectangular steel tube, from the easement curve figure of for example Fig. 8 as seen, its flat part 3a, bight 3b, welding seam part 2 all have the easement curve identical with motherboard, even also have enough toughness at low-temperature space.
Fig. 9 shows the 2nd embodiment as the 1st embodiment variant.Promptly the difference with the 1st embodiment is, places on the cooling bench 28 taking out as round steel pipe (final products) 5 at hot formed refining base pipe on the round steel pipe forming rolls 20.Slow cooling on cooling bench 28 then, and with the 1st embodiment in similarly send into apparatus for correcting 30, in way station 32, shearing device 35,36, scouring table 38, flusher 40, the Rustproofing apparatus 45, and be kept on the output table 46.Hot formed like this large-diameter circular steel pipe (final products) 5 has the performance identical with above-mentioned rectangular steel tube 3.
Below, according to Figure 10～the 3rd embodiment of 12 explanations.Wherein, the symbolic representation same or analogous structure identical with the 1st embodiment, and omit detailed description thereof.
For example, when making heavy caliber four horn shape rectangular steel tubes, the flat blank material that regulation thickness of slab, length, width are arranged that matches with this rectangular steel tube, be that steel plate 51 is stacked into the multilayer stacked state, a uppermost steel plate 51 in these steel plates 51 buttress is with extracting such as the elevator of for example carry magnet and transfer on the conveyer 60.With conveyer 60 steel plate 51 is sent in the groove processing machine 61 then, on a pair of marginal portion that will weld, formed groove 52.
And the steel plate 51 of prebeveling 52 can be stacked the stratification overlapping state.Its uncoiling is on one side cut off on one side.
The steel plate 51 usefulness conveyers 60 that form groove 52 are sent into compression molding press 62.In this compression molding press 62, be configured as polygonal hollow steel tube 53 pressing in the steel plate 51.That is, for example, by 7 places are carried out pressure forming, pressure forming is for there being the polygonal hollow steel tube 53 of 8 dihedrals of big opening between a pair of groove 52.This moment polygonal hollow steel tube 53 by pressure forming for when becoming final rectangular steel tube, always make its welding seam part be in flat part central authorities near locational.
With conveyer 60 this polygonal hollow steel tube 53 is delivered to tack welder 63, apply external pressure then and groove 52 is docked mutually and carry out tack welding and connect 54.With conveyer 60 polygonal hollow steel tube 53 is sent into then and carried out the inside welding 55 in the bonding machine 64 of the inside, again polygonal hollow steel tube 53 is sent into and carried out outside welding 56 in the bonding machine 65 of outside, make the polygonal hollow steel tube 58 of polygon-octagonal of welding seam part 57 therefrom, the welding of its each one can realize by ratio-frequency welding or arc welding.
Polygonal hollow steel tube 58 making like this is sent on the input table 66 from conveyer 60.The polygonal hollow steel tube 58 that is sent to input table 66 terminals is admitted in the heating furnace 12, in transmission it is carried out high temperature heating H it is in more than the A3 transformation temperature.The polygonal hollow steel tube 58 that is heated to set point of temperature is taken out of from heating furnace 12, delivers to rectangular steel tube forming rolls 25 again.
In this rectangular steel tube forming rolls 25, carrying out last hot forming by a plurality of cydariform roll 26 grades makes each angle part of polygonal hollow steel tube 58 become the plane, simultaneously form new bight, so go out the dimetric rectangular steel tube 59 of heavy caliber with regard to hot forming at its plate part.
Though this moment, rectangular steel tube 59 its each the flat part 59a after the hot forming formed outwardly arc surface along the cydariform face, thereafter, each planar portions 59a of rectangular steel tube 59 shrinks, and it is straight that arc surface also just becomes, and bight R becomes sharply, has improved section factor.Because polygonal hollow steel tube 58 is a polygon-octagonal, when transmitting, be always to carry out towards certain direction with one of them plate part with conveyer 60, so the hot forming in rectangular steel tube forming rolls 25 always makes welding seam part 57 towards certain direction, weld seam part 57 is positioned at carry out near the flat part 59a middle position.Rectangular steel tube 59 on cooling bench 28 is with air cooling mode dispel the heat I, just slow cooling.
Below, according to Figure 13,14 the 4th embodiment as the 3rd embodiment variant is described.
I.e. pressure forming by 62 pairs of polygonal hollow steel tubes 53 of compression molding press is welding seam part 57 to be positioned on the bight of polygonal hollow steel tube 53 realize.So, when obtaining final rectangular steel tube 59, for welding seam part 57 always is near the central authorities of flat part 59a on the position, will be with position while welding adjusting device (not shown) for example to sending into polygonal hollow steel tube 58 travel direction adjustment and the standards before the rectangular steel tube forming rolls 25.
The 5th embodiment as the other modification of the 3rd embodiment has been shown among Figure 15.
Promptly, behind the polygonal hollow steel tube 58 of the polygon-octagonal of making weld seam 57, cold roll forming is a pipe 68 by pipe forming rolls (not shown) to make this polygonal hollow steel tube 58, then pipe 68 is sent into heating furnace 12, carry out high temperature heating H, send into rectangular steel tube forming rolls 25 again and roll into dimetric rectangular steel tube 59.
In this 5th embodiment, from polygonal hollow steel tube 58 cold roll formings is that pipe 68 carries out easily, and be rolled into rectangular steel tube 59 from pipe 68 and also realize high accuracy easily, and then can also carry out making it to be thermoformed into pipe 68 after the high temperature heating H polygonal hollow steel tube 58 being sent into heating furnace 12 by the pipe forming machine.
Though be to make section for just dimetric tetragonal steel pipe 59 in the 3rd～the 5th above-mentioned embodiment, it also can similarly make rectangular rectangular steel tube 59.And then the roll configuration by change rectangular steel tube forming rolls 25 etc. can also realize the hot forming of polygonal steel pipes 59 such as pentagon steel pipe or hexagon steel pipe.
In above-mentioned the 3rd～the 5th embodiment, though to the pressure forming of 7 places and pressure forming is octagonal polygonal hollow steel tube 53, but just can at random be adjusted into 6 dihedrals to the shape at polygonal hollow steel tube 53 angle that is polygonal hollow steel tube 58, shapes such as 10 dihedrals as long as change the position number of exerting pressure.
And the positional number of exerting pressure is many more, and just can obtain bending angle more is the circular polygonal hollow steel tube 53 that is bordering at obtuse angle, more helps the shaping of rectangular steel tube 59.At this moment, increase the position though it is exerted pressure, and compares still much less with the number of times of exerting pressure that the pipe in past is shaped.
In above-mentioned the 3rd～the 5th embodiment, though the polygonal hollow steel tube 53 of octagonal that place's opening arranged is welded and form polygonal hollow steel tube 58, can be a pair of section that the parts (a plurality of molded component of cutting apart) of C shape lump together and weld the polygonal hollow steel tube 58 that is formed with two places (many places) welding seam part 57 also.
Below, according to Figure 16, Figure 17 the 6th embodiment is described.The wherein identical identical or essentially identical works of symbolic representation with the 1st or the 3rd embodiment, and omit its detailed explanation.
For example when making heavy caliber quadrangle rectangular steel tube, the thickness of slab that regulation is arranged, the length that match with this rectangular steel tube (final products), and the flat blank material wideer than the spreading width size of square steel pipe is that steel plate 51 is stacked into the multilayer stacked state.
In groove processing machine 61, form the steel plate 51 of groove 52, in turn for example 4 places are carried out pressure forming and suppress the polygonal hollow steel tube 53A of open quadrangle between a pair of groove 52 by compression molding press 62.The polygonal hollow steel tube 53A of this moment then is pressed into and makes weld seam remain near the state of the position flat part central authorities when obtaining final rectangular steel tube.
To this polygonal hollow steel tube 53A, position weldering 54 with tack welder 63 earlier, carry out the inside welding 55 by the inside bonding machine 64 again, carry out outside welding 56 by outside bonding machine 65 then, thereby make the polygonal hollow steel tube 58A of positive quadrangle of welding seam part 57.
The polygonal hollow steel tube 58A that makes like this, as previously mentioned, owing to used the steel plate 51 wideer than the spreading width size of tetragonal rectangular steel tube, the width dimensions W1 of its each flat part 58a will be wideer than the flat part size of final products (aftermentioned).
The polygonal hollow steel tube 58A that makes as previously mentioned sends into input table 66 from conveyer 60, sends into heating furnace 12 from the input table terminal part then, and carries out high temperature heating H in the conveying in this heating furnace 12.
Be heated to the polygonal hollow tube 58A of set point of temperature, from heating furnace 12, transport, send into leading portion rectangular steel tube forming rolls 70 then.In this leading portion rectangular steel tube forming rolls 70, carry out hot forming (forming temperature is more than the A3 transformation temperature) by a plurality of cydariform roll 71 grades, polygonal hollow steel tube 58A is carried out the drawing and forming of leading portion.Then polygonal hollow steel tube 58A is sent into back segment rectangular steel tube forming rolls 72, in this back segment rectangular steel tube forming rolls 72, carry out hot forming (forming temperature is more than the A3 transformation temperature) by a plurality of flat roll 73 grades, polygonal hollow steel tube 58A is carried out the drawing and forming of back segment (terminal), thereby be thermoformed into the heavy caliber quadrangle rectangular steel tube 59 of given size.
This rectangular steel tube 59 is final products, the width dimensions W of its flat part 59a is formed by two-stage (multiform) pull and stretch, width dimensions W1 than the flat part 58a of aforesaid polygonal hollow steel tube 58A is narrow, be W＜W1, by hot drawing and forming its front end from rectangular steel tube 59 is shaped completely or almost completely to the rear end, therefore, need excise its leading section and rearward end in the operation in the back, or cut short size, thereby yield rate is improved.
It is the plane that rectangular steel tube 59 after the hot forming has become its each flat part 59a, and bight R comes to a point, the goods that section factor is high.Be placed on hot formed rectangular steel tube 59 on the cooling bench 28 then and in transmission, carry out air cooling heat radiation I, i.e. cools down.
In above-mentioned the 6th embodiment, though be hot formed in the front and back stages pull and stretch with back segment rectangular steel tube forming rolls 72 with leading portion rectangular steel tube forming rolls 70, but also only hot forming in the one-level pull and stretch, or hot forming in the multistage pull and stretch more than two-stage.
Below, according to Figure 18 the 7th embodiment as the 6th embodiment variant is described.
At this moment, polygonal hollow steel tube 58A is when pressure forming, be to use the steel plate wideer (flat blank material) 51 than the spreading width size of tetragonal rectangular steel tube (final products), so the width dimensions W1 of formed each the flat part 58a just width dimensions than the flat part of final products is big, and the radius of curvature R 1 of its bight 58b also the bight radius of curvature than final products is big.
The polygonal hollow steel tube 58A that makes as mentioned above is transported into input table 66 from conveyer 60, sends into heating furnace 12 from its terminal part then, carries out high temperature heating H while transmit in this heating furnace 12.
Be heated to the polygonal hollow steel tube 58A of set point of temperature, from heating furnace 12, transport, and be transported to leading portion rectangular steel tube forming rolls 70, in leading portion rectangular steel tube forming rolls 70, carry out hot forming (forming temperature is more than the A3 transformation temperature) by a plurality of cydariform roll 71 grades, realize leading portion drawing and forming polygonal hollow steel tube 58A.Then polygonal hollow steel tube 58A is delivered to back segment rectangular steel tube forming rolls 72.In this back segment rectangular steel tube forming rolls 72, carry out hot forming (forming temperature is on the A3 transformation temperature) with a plurality of flat roll 73 grades, realize the drawing and forming of back segment (final level) to polygonal hollow steel tube 58A.
Like this, carry out multistage drawing and forming (or single-stage drawing and forming) by means of leading portion rectangular steel tube forming rolls 70 and 72 couples of polygonal hollow steel tube 58A of back segment rectangular steel tube forming rolls and just made rectangular steel tube 59 as final products.At this moment, the width dimensions W of the flat part 59a of the rectangular steel tube 59 that forms by above-mentioned drawing and forming is narrower than the width dimensions W1 of polygonal hollow steel tube 58A, be W＜W1, and the radius of curvature R of formed bight 59b is littler than the radius of curvature R 1 of the bight 58b of polygonal hollow steel tube 58A, i.e. R＜R1.
As previously mentioned, make the radius of curvature R of the radius of curvature R 1 of bight 58b greater than the bight 59b of rectangular steel tube (final products) 59 by compacting, can be easily, do not carry out pressure forming tough, by high temperature heating H, the polygonal hollow steel tube 58A that material (molecules align) is restored carries out the hot-drawn Deep forming, so that its width dimensions W is narrow and radius of curvature R bight 59b diminishes again, can do not changed final products material, that section factor is high, promptly rectangular steel tube 59.
In above-mentioned the 6th, the 7th embodiment, be polygonal hollow steel tube 53A to be positioned weldering 54, carry out again after the inside welding 55, carry out outside welding 56 and make polygonal hollow steel tube 58A's, but also can carry out outside welding 56 earlier, carry out the inside welding again, or about welding 55,56 welding manners that carry out simultaneously, and then can also save the welding manner of tack welding 54.
Below, according to Figure 19,20 explanations the 8th embodiment.
For example, when making heavy caliber quadrangle rectangular steel tube, a regulation thickness of slab that matches with this rectangular steel tube (final products), the base material of length are that steel plate 81 is as rolling up (roller) shape.Steel plate 81 is after using decoiling equipment 90 uncoilings that are made of pinch roll etc., and it is dull and stereotyped being corrected by levelling device 91, then with 92 fore-ends that cut the uncoiling of steel plate 81 of shearing device.
The steel plate 81 that comes out of uncoiling cuts two side portions by edge-neatening apparatus 93 continuously as previously mentioned, formation is than the wideer width of spreading width size of square steel pipe (final products), then steel plate 81 usefulness pre-forming devices 94 are formed slow crooked R shape, slowly roll into font by rough rolling device 95 again into U.
U font steel plate 81 bends towards the inboard with a pair of vertical component effect on its top in intermediate mill group 96, be configured as the pipe shape gradually by finish rolling device (Off イ Application パ ス) 97 then, thereby compacting forms the circular hollow steel tube 82 that an oppose side edge joins, this hollow steel tube 82 is sent into add thermofussion welding in the high frequency resistance welding machine 98 after, with the outer cap pass of topping machanism 99 cuttings, make the circular hollow steel tube (base pipe) 84 of welding seam part 83.
The hollow steel tube of making like this 84 is admitted to many (two) correctors 100, is near just round shape by a plurality of shapings such as cydariform roll 101 grades (rectification), then, hollow steel tube 84 is sent in the rectangular steel tube forming rolls (Cheng Fangji) 102.This rectangular steel tube forming rolls 102 is many (5), progressively carries out cold roll forming by a plurality of cydariform roll 103 grades respectively and forms tetragonal polygonal hollow steel tube 85.
The polygonal hollow steel tube 85 of this moment is when the rectangular steel tube that gets to the end, always to keep welding seam part 83 to be positioned near the locational mode cold roll forming of central authorities of flat part.What the polygonal hollow steel tube 85 of cold roll forming used is foregoing than the wideer steel plate 81 of square steel pipe spreading width size, so the width dimensions W1 of each flat part 85a just becomes the wideer size of flat part size than final products (aftermentioned), this polygonal hollow steel tube 85 after the alignment, is cut into specific length with milling formula walking shearing device 105 in crooked correction equipment (turks) 104.
The polygonal hollow steel tube of making like this 85 is directly delivered on the Conveyorized input table 106 continuously or after transporting to other storage place again.Deliver to the polygonal hollow steel tube 85 of input table 106 terminal parts and send into heating furnace 107 and transmission in the longitudinal direction, high temperature heats more than H to the A3 transformation temperature in transmission.
Be heated to the polygonal hollow steel tube 85 of set point of temperature, from heating furnace 107, transport, send into then in the leading portion rectangular steel tube forming rolls 108, in this leading portion rectangular steel tube forming rolls 108, carry out hot forming (forming temperature is more than the A3 transformation temperature) by a plurality of cydariform roll 109 grades, polygonal hollow steel tube 85 is carried out the drawing and forming of leading portion.Then polygonal hollow steel tube 85 is transported to back segment rectangular steel tube forming rolls 110.In this back segment rectangular steel tube forming rolls 110, carry out hot forming (forming temperature is more than the A3 transformation temperature) by a plurality of flat roll 111 grades, polygonal hollow steel tube 85 is carried out the drawing and forming of back level (final level), thereby be thermoformed into the heavy caliber quadrangle rectangular steel tube 86 of given size.
This rectangular steel tube 86 is final products, and the size W of its flat part 86a forms through two-stage (multistage) pull and stretch, makes it narrower with respect to the width dimensions W1 of the flat part 85a of above-mentioned polygonal hollow steel tube 85, i.e. W＜W1.And by hot drawing and forming fully or be bordering on fully and be shaped, do not need or only cut shorter size to get final product the yield rate height thereby the cut-out removal of the leading section of back operation and rearward end become from the leading section of rectangular steel tube to rearward end.In addition, the rectangular steel tube after the hot forming 86 promptly becomes the high steel pipe of section factor that each flat part 86a becomes straight plane, bight R to come to a point.
Around the square steel tube forming milling train 108,120 in front and back,,, make in apparent good order and condition to remove descale etc. by descale device 112 square shaped steel pipes 86 expulsion pressure water.Hot formed rectangular steel tube 86 is delivered to air cooling heat radiation I on the cooling bench 113, and promptly cools down under identical atmosphere temperature degree reduces the bending when cooling off.
In above-mentioned the 8th embodiment, the cold roll forming from hollow steel tube 84 to polygonal hollow steel tube 85 is realized one-level rectangular steel tube forming rolls 102, but also can be carried out on multistage rectangular steel tube forming rolls 102.And, above-mentioned is by the two sections pull and stretch hot formings on one side on one side in leading portion rectangular steel tube forming rolls 108 and 110 pairs of front and back of back segment rectangular steel tube forming rolls, also can be only by wherein side pull and stretch hot forming on one side on one side, or to the multistage one side pull and stretch one side hot forming more than the two-stage.
In above-mentioned the 8th embodiment, though be to be hollow steel tube 84 to a place open circular hollow steel tube 82 shape that is welded, also can carry out two places (many places) welding and the hollow steel tube 4 of formation welding seam part 83 the parts of a pair of semi-circular cross-section (the arc shape parts that multistage is cut apart) altogether.
Below, according to Figure 21 the 9th embodiment that the 8th embodiment is out of shape is described.
In corrector 100 by shapings such as cydariform roll 101 (rectification) for being admitted in the rectangular steel tube forming rolls 102 near just round hollow steel tube 84, by a plurality of cydariform roll 103 grades progressively cold roll forming form tetragonal polygonal hollow steel tube 85.
At this moment, polygonal hollow steel tube 85, because when in edge-neatening apparatus 93, cutting its two side portions, the steel plate 81 that formation is wideer than the spreading width size of square steel pipe, the width dimensions W1 of its each flat part 85a forms wideer than the width dimensions of final products flat part, and the radius of curvature R 1 of bight 85b also the radius of curvature than final products bight is big.
The polygonal hollow steel tube of making like this 85 is sent in the heating furnace 107 along its length, and carries out high temperature heating H in transmission.Then polygonal hollow steel tube 85 is sent in the leading portion rectangular steel tube forming rolls 108, with a plurality of cydariform roll 109 hot formings such as grade (forming temperature is more than the A3 transformation temperature), promptly carry out the leading portion drawing and forming, then by descaling device 112 expulsion pressure water to remove mill scale, send into back segment rectangular steel tube forming rolls 110 again, carry out the drawing and forming that back segment (terminal section) promptly carried out in hot forming (forming temperature is more than the A3 transformation temperature) by a plurality of flat roll 111 grades.
For this polygonal hollow steel tube 85, be to be made as the rectangular steel tube 86 of final products by carry out multistage drawing and forming (or single-stage drawing and forming) at leading portion rectangular steel tube forming rolls 108 and back segment rectangular steel tube forming rolls 110.At this moment, by above-mentioned drawing and forming, the width dimensions W of the flat part 86a of its rectangular steel tube 86 is narrower than the width dimensions W1 of the flat part 85a of polygonal hollow steel tube 85, promptly be configured as W＜W1 state, and the radius of curvature R of bight 86b is littler than the radius of curvature R 1 of the bight 85b of polygonal hollow steel tube 85, promptly is configured as R＜R1 state.
As previously mentioned, because it is bigger than the radius of curvature R of the bight 86b of square steel pipe (final products) 86 that the radius of curvature R 1 of bight 85b is configured as, so need not to carry out tough cold roll forming to polygonal hollow steel tube 85 from hollow steel tube 84, cold rollingly more easily carry out, and by means of high temperature heating H, the polygonal hollow steel tube 85 hot drawing and formings of material (molecules align) recovery are made it width dimensions W to narrow down, the radius of curvature R of bight 86b diminishes, just can obtain the final products that material does not change, section factor is high, promptly rectangular steel tube 86.
In the various embodiments described above, be base pipe 1 to be sent in the heating furnace 12 to heat along its length while transmitting, and in the 10th embodiment of Figure 22～Figure 28, while then be to adopt base pipe 1 along vertical with the length direction mode that heats of transversely transmitting.Wherein, the structure that the symbolic representation identical with the 1st and the 3rd embodiment etc. is identical or identical is substantially omitted its detailed description at this.
As shown in Figure 22, for example when making heavy caliber four horn shape rectangular steel tubes 3, round billet pipe 1 is ready on input table 120, this input table 120 is arranged on the conveyor construction on the platform 121, supporting many base pipes 1 abreast, transmitting with horizontal B direction then perpendicular to length of tube direction A.The base pipe 1 that is sent to input table 120 terminal parts is sent in the heating furnace 130, and in heating furnace 130, the transverse direction B that an edge is vertical with the length direction A of pipe transmits, on one side more than high temperature heating H to the A3 transformation temperature.
Above-mentioned heating furnace 130, as Figure 23～shown in Figure 25, be by the furnace wall, bottom 131 that forms seating surface 131a above it, from upright sidepiece furnace wall 132 of establishing, these two ends, 131 left and right sides, furnace wall, bottom, from the upright anterior furnace wall 133 of establishing of the front end of aforementioned bottom oven wall 131, upright be located at the furnace wall, rear portion 134 of 131 rear ends, furnace wall, above-mentioned bottom and be located at sidepiece furnace wall 132 and the upper end of anterior furnace wall 133 and furnace wall, rear portion 134 between furnace wall, top 135 etc. constitute, form cassette shapes, and heating furnace 130 is supported in the side of platform 121 by support 122.
The movable body of heater 142 that can move up and down and seesaw is set on furnace wall, above-mentioned bottom 131.Promptly, basic for forming the chute 143 of left and right directions width on whole length at several position (being 4 in this embodiment) the upper edge fore-and-aft direction of furnace wall, bottom 131 left and right directions, 142 of movable bodies of heater can free liftings and are entrenched in each chute 143 with seesawing.On movable body of heater 142, be formed with recessed circular-arc lifting face 142a with the spacing suitable with prescribed distance described later.
And then also in the seating surface 131a of furnace wall, bottom 131 side, on the single or multiple positions of regulation, be provided with and rotate with projection 144, this rotates with projection 144, earlier block the base pipe 1 of making down maneuver (aftermentioned) by seating surface 131a, make this base pipe 1 automatically rotate (rotation) with the dislocation shape, the front that forms heating furnace 130 in upper and rear end side on the next inclined plane.Heating furnace 130 is to be made of 131～134 above-mentioned grades.
Arranged outside input unit 145 in above-mentioned input port 136 is at the arranged outside output device 146 of above-mentioned delivery outlet 137.These input units 145 are structures of clamper or lifter formula etc. with output device 146, but can utilize input table 120 conveyer carrying capacity etc. and without these structures.
Send into the base pipe 1 in the above-mentioned heating furnace 130, by the elevating movement of carrying out movable body of heater 142 and the intermittence that seesaws feeder 150 successively, make along distolateral backward one side on the direction of the horizontal B vertical and carry off and on the length direction A of pipe, one side is carried out high temperature heating H, promptly, platform 121 sides below furnace wall, bottom 131 form recess 123, on the bottom in these recesses 123 base frame 151 are set.Many poles of vertically-arranged 152 from this base frame 151 are being supported bottom surface one side of furnace wall 131, bottom by the upper end of these poles 152.
The lowering or hoisting gear 157 that makes above-mentioned movable body 153 elevating movements is made of array apparatus down: on a plurality of positions of fore-and-aft direction by lateral pin 158 can be on fore-and-aft direction the free a plurality of rod members 159 that joltily are arranged on base frame 151 sides, be connected the pull bar 160 of the fore-and-aft direction of these rod member 159 lower ends, the lifting that is connected these pull bar 160 1 ends is with oil hydraulic cylinder 161, is hinged on each bar 159 upper end and with the roller that joins below 162 of the bottom framework 154 of movable body 153 etc.Elevating movement device 157 is that one group of ground is provided with pair of right and left, and two elevating movements this moment are synchronously moved with oil hydraulic cylinder 161.
Seesawing of making that above-mentioned movable body 153 does to seesaw is arranged between the body of rod 164 and above-mentioned base frame 151 that is connected with forward from lower frame 154 with oil hydraulic cylinder 163.It seesaws and can relative freedom joltily connect corresponding to corresponding attaching parts with oil hydraulic cylinder 161 with above-mentioned elevating movement with oil hydraulic cylinder 163.Constituted intermittently feeder 150 successively by above-mentioned 151～164.And then the action by movable body of heater 142 changes the gap that forms in chute 143 parts, then suitably sealed with sealing device (not shown) etc.
As previously mentioned, be transported to the base pipe 1 of input table 120 terminals,, carry, send in the heating furnace 130 by input port 136 and go up along the horizontal B vertical with the length direction A of pipe by the action of opening the input unit 145 after the shutter door 138.At this moment, movable body of heater 142 descending motions and towards the input port 136 1 sides advance.The base pipe of sending into 1 is supported on the seating surface 131a of furnace wall, bottom 131 as shown in figure 25, and closes shutter door 138 after sending into.
Under this state, elevating movement is shunk with oil cylinder 161 rod member is waved for 159 groups, 162 groups movable body 153 is risen by the roller that moves up, thereby make 142 groups of movable bodies of heater in chute 143, make ascending motion D by this movable body 153, thereby as shown in figure 26, the base pipe 1 that is supported on the seating surface 131a is promoted by promoting face 142a.Then, seesaw with oil cylinder 163 elongations, the movable body 153 that is supported on 162 groups of the rollers retreats, thereby make 142 groups of movable bodies of heater in chute 143, make setback E by this movable body 153, so just as shown in figure 27, the spacing of the distolateral backward transmission regulation of base pipe 1 that promotes by the face of lifting 142a and support.
Because the elevating movement elongation of oil cylinder 161, rod member is waved for 159 groups, 162 groups movable body 153 is descended by roller to lower swing, make 142 groups of movable bodies of heater in chute 143, make descending motion F by this movable body 153, so as shown in figure 28, the base pipe 1 on the lifting face of the being supported in 142a is carried out the transition on the seating surface 131a.Thereafter, by seesawing with the contraction of oil cylinder 163, the movable body 153 by 162 groups of supports of roller is advanced, make 142 groups of movable bodies of heater in chute 143, make forward travel G by this movable body 153, so just as shown in figure 25, make the empty distolateral forward spacing of returning regulation of lifting face 142a.
The input port 136 that base pipe 1 was opened by the short time is sent in the heating furnace 130.Then, in heating furnace 130, the movable body of heater 142 of base pipe 1 by being influenced by heat hardly is under the action at intermittence feeder 150 successively, along sending to successively off and on the spacing of regulation to the back-end from front end on the horizontal B direction vertical with its length direction A.In the transport process in heating furnace 130, the flame high temperature heating H that utilizes burner for heating 140 is to more than the transformation temperature A3.
At this moment, in heating furnace 130, many base pipes 1 can side by side intermittently be sent to successively.Send transmission successively to base pipe 1 is realized with inactive state substantially, transmit the heating transmission of damage so can realize unlikely generation.And at the assigned position place, the base pipe 1 of making descending motion F contacts with the inclined-plane that rotates with projection 144, and by means of the rotation on this inclined-plane, after the dislocation shape rotated automatically, 131a caught by seating surface.Make base pipe 1 pine for one or many and rotate and change it and be supported face adding whereby, can accomplish to heat in heterogeneity.
Heat like this and be sent near the delivery outlet 137 base pipe 1, when above-mentioned descending motion F, by the delivery outlet of in time opening at short notice 137, action by means of output device 146, and go up transmission along the horizontal B vertical with its length direction A, deliver on the conveyer 165 from heating furnace 130.After its output, shutter door 139 is closed.
Be heated to the base pipe 1 of set point of temperature and output as described above in heating furnace 130, as shown in Figure 22, carry on position while welding adjusting device 15, the position alignment that makes welding seam part 2 is on certain orientation.Again base pipe 1 is sent into round steel pipe forming rolls 20, make refining base pipe 1A by 21 hot formings such as grade of a plurality of schools shape roller.Then refining base pipe 1A is sent in the rectangular steel tube forming rolls 25, with 26 hot formings such as grade of cydariform roll, the heavy caliber four horn shape rectangular steel tubes 3 that go out to have given size with hot forming as final products.
Below, according to 11st embodiment of Figure 29 explanation as the 10th embodiment variant.
That is, when Production Example such as heavy caliber quadrangle rectangular steel tube 3, be ready on input table 120 as the base pipe with the square steel pipe that regulation bore, thickness of slab and length are arranged (or the rectangle steel pipe) 1B that matches with this rectangular steel tube 3.Then the square steel pipe 1B that delivers to input table 120 terminal parts is sent into heating furnace 130, in heating furnace 130, transmit along the transverse direction B vertical with the length direction A of pipe, and more than high temperature heating H to the A3 transformation temperature.
At this moment, the lifting face 142b of formation flat on movable body of heater 142.And the square steel pipe 1B that sends from heating furnace 130 carries out hot forming not by round steel pipe forming rolls 20 but enter rectangular steel tube forming rolls 25 by conveyer 165.
In above-mentioned the 10th embodiment and the 11st embodiment, in base pipe 1,1B being sent into the front end of heating furnace 130, send from the rear end, the open hour of input port 136 and delivery outlet 137 can shorten, can reduce the flame flow that sprays to input port 136 and delivery outlet 137 from burner for heating 140, improve its thermal efficiency.And by means of making intermittence conveyer 150 successively movable body of heater 142 do elevating movement and seesaw, in heating furnace 130, base pipe 1,1B by the movable body of heater 142 that is influenced by heat hardly can from front to the back-end side transmit with prescribed distance successively off and on.This moment, it sent successively that to make base pipe 1,1B basically be that inactive state does not produce to carry and carries out with causing injury to, and, even big load heavy wall heavy caliber base pipe 1, the also unlikely damage of 1B intermittence feeder 150 successively, can often stably transmit.
Claims (2)
1. the manufacture method of a rectangular steel tube, it is characterized in that, with the rectangular steel tube forming rolls to round billet pipe cold roll forming, the polygonal hollow steel tube that formation is bigger than final products width dimensions, in heating furnace,, obtain rectangular steel tube with other rectangular steel tube forming rolls limit pull and stretch limit hot forming again to after this polygonal hollow steel tube heating.
2. the manufacture method of rectangular steel tube as claimed in claim 1, it is characterized in that, formation width dimensions broad, the polygonal hollow steel tube that the bight radius of curvature is bigger, the polygonal hollow steel tube that will heat in heating furnace carries out limit pull and stretch limit hot forming with other rectangular steel tube forming rolls to its width dimensions and bight radius of curvature.
Applications Claiming Priority (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7192343A JPH0938721A (en) | 1995-07-28 | 1995-07-28 | Production of square steel tube |
| JP192343/1995 | 1995-07-28 | ||
| JP197838/1995 | 1995-08-03 | ||
| JP19783895 | 1995-08-03 | ||
| JP202637/1995 | 1995-08-09 | ||
| JP20263795 | 1995-08-09 | ||
| JP7288232A JPH09103821A (en) | 1995-08-09 | 1995-11-07 | Manufacture of square steel tube |
| JP288232/1995 | 1995-11-07 | ||
| JP288233/1995 | 1995-11-07 | ||
| JP7288233A JPH0999324A (en) | 1995-08-03 | 1995-11-07 | Manufacture of square tube |
| JP14783/1996 | 1996-01-31 | ||
| JP01478396A JP3231239B2 (en) | 1996-01-31 | 1996-01-31 | Steel pipe manufacturing method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96113345A Division CN1066075C (en) | 1995-07-28 | 1996-07-26 | Mfg. method for square steel pipe and mfg. method for circular steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1291532A CN1291532A (en) | 2001-04-18 |
| CN1177656C true CN1177656C (en) | 2004-12-01 |
Family
ID=27548533
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001270524A Expired - Fee Related CN1177656C (en) | 1995-07-28 | 1996-07-26 | Manufacturing method of square steel tube and round steet tube |
| CN96113345A Expired - Fee Related CN1066075C (en) | 1995-07-28 | 1996-07-26 | Mfg. method for square steel pipe and mfg. method for circular steel pipe |
| CN 00127053 Expired - Fee Related CN1186141C (en) | 1995-07-28 | 2000-09-15 | Manufacturing method of square steel tube and round steel tube |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96113345A Expired - Fee Related CN1066075C (en) | 1995-07-28 | 1996-07-26 | Mfg. method for square steel pipe and mfg. method for circular steel pipe |
| CN 00127053 Expired - Fee Related CN1186141C (en) | 1995-07-28 | 2000-09-15 | Manufacturing method of square steel tube and round steel tube |
Country Status (3)
| Country | Link |
|---|---|
| CN (3) | CN1177656C (en) |
| HK (2) | HK1036027A1 (en) |
| MY (2) | MY126145A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104307924A (en) * | 2014-11-14 | 2015-01-28 | 武汉钢铁(集团)公司 | Square rectangular tube cold roll forming method |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102861766B (en) * | 2012-09-20 | 2015-04-01 | 衡阳华菱钢管有限公司 | Square tube rolling device, square tube sizing mill with same and production method of square tube |
| CN103629965A (en) * | 2013-11-29 | 2014-03-12 | 锦州秀亭制管有限公司 | Cooling pipe with square pits |
| CN104128373A (en) * | 2014-08-12 | 2014-11-05 | 无锡市瑞尔精密机械股份有限公司 | Novel machine set for producing hot rolling seamless square steel pipe |
| CN104353699B (en) * | 2014-10-11 | 2016-09-21 | 浙江久德不锈钢型材有限公司 | Steel pipe mould |
| KR102400687B1 (en) * | 2018-03-16 | 2022-05-20 | 제이에프이 스틸 가부시키가이샤 | Manufacturing method of each steel pipe and each steel pipe |
| CN108453153A (en) * | 2018-05-03 | 2018-08-28 | 石家庄富瑞沃机电设备有限公司 | A kind of roll device and forming method of square tube straight forming |
| KR20210135287A (en) * | 2019-04-08 | 2021-11-12 | 제이에프이 스틸 가부시키가이샤 | Rectangular steel pipe, manufacturing method thereof, and building structure |
| JP7014306B2 (en) * | 2019-08-30 | 2022-02-01 | Ｊｆｅスチール株式会社 | Manufacturing method of square steel pipe |
| CN111229859B (en) * | 2020-01-14 | 2021-12-03 | 长沙市大川防火材料有限公司 | Automatic production process of air duct |
| WO2021187115A1 (en) * | 2020-03-16 | 2021-09-23 | Ｊｆｅスチール株式会社 | Square steel pipe for beam-column joint, beam-column joint structure using same, and method for manufacturing square steel pipe |
| CN111687213A (en) * | 2020-06-23 | 2020-09-22 | 刘伟良 | Hot rolling device is used in production of nonrust steel pipe |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69935236T2 (en) * | 1998-08-12 | 2007-11-08 | Rofin Australia Pty. Ltd., Dingley | LIQUID LIGHT GUIDE |
-
1996
- 1996-07-26 CN CNB001270524A patent/CN1177656C/en not_active Expired - Fee Related
- 1996-07-26 CN CN96113345A patent/CN1066075C/en not_active Expired - Fee Related
- 1996-07-27 MY MYPI0105380 patent/MY126145A/en unknown
- 1996-07-27 MY MYPI20015370A patent/MY124926A/en unknown
-
2000
- 2000-09-15 CN CN 00127053 patent/CN1186141C/en not_active Expired - Fee Related
-
2001
- 2001-10-08 HK HK01107036A patent/HK1036027A1/en not_active IP Right Cessation
- 2001-10-08 HK HK01107038A patent/HK1036028A1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104307924A (en) * | 2014-11-14 | 2015-01-28 | 武汉钢铁(集团)公司 | Square rectangular tube cold roll forming method |
Also Published As
| Publication number | Publication date |
|---|---|
| MY126145A (en) | 2006-09-29 |
| HK1036028A1 (en) | 2001-12-21 |
| CN1066075C (en) | 2001-05-23 |
| HK1036027A1 (en) | 2001-12-21 |
| CN1291533A (en) | 2001-04-18 |
| MY124926A (en) | 2006-07-31 |
| CN1291532A (en) | 2001-04-18 |
| CN1154880A (en) | 1997-07-23 |
| CN1186141C (en) | 2005-01-26 |
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