CN203343164U - Production line of asymmetrical joist steel for hoisting machinery - Google Patents
Production line of asymmetrical joist steel for hoisting machinery Download PDFInfo
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- CN203343164U CN203343164U CN 201320213194 CN201320213194U CN203343164U CN 203343164 U CN203343164 U CN 203343164U CN 201320213194 CN201320213194 CN 201320213194 CN 201320213194 U CN201320213194 U CN 201320213194U CN 203343164 U CN203343164 U CN 203343164U
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Abstract
The utility model discloses a production line of asymmetrical joist steel for hoisting machinery. The production line comprises a reversible cogging mill and an all-powerful tandem rolling unit, wherein the reversible cogging mill comprises a plurality of asymmetrical hole patterns, each asymmetrical hole pattern is different in thickness of flanges on the two sides and identical in ductility of the flanges on the two sides, and hole patterns of all-powerful tandem rolling machines in the all-powerful tandem rolling unit are different in rolling reduction and identical in ductility. According to joint steel produced on the production line, under the condition that using performance is guaranteed, the sectional area and the weight of per meter of the joist steel for the hoisting machinery are effectively lowered, and production cost of the hoisting machinery is lowered. In addition, the cogging mill and the all-powerful tandem rolling unit are provided with the hole patterns which are different in thickness of flanges on the two sides and identical in ductility of the flanges on the two sides, a rolled piece can be prevented from being bent, and product appearance size precision is guaranteed.
Description
Technical field
The utility model belongs to machine-building and metal material processing and field shaping technique, be specifically related to the production line of hoisting machinery with asymmetric I-steel, the asymmetric I-steel obtained by this production line is in the situation that guaranteed that serviceability effectively reduces cross-sectional area, thereby reduce the manufacturing cost of crane beam, and this production line can prevent the rolled piece bending, the appearance and size precision of assurance product.
Background technology
I-steel is that cross section is I-shaped rectangular steel, is widely used in various building structure, bridge, vehicle, support, machinery etc.The crane rail that has been used for substance transfer is generally the I-steel of Application standard, producing electric hoist, when single-beam cranes etc. are done the crane beam of crane way with I-steel, one side (top) of I-steel is done the guide rail of electric hoist and is born very large heavy burden, opposite side (bottom) is not born heavy burden substantially, but be welded on web and do the load-bearing crossbeam by two block plates, one side (bottom) of not load-bearing is enclosed in crossbeam, the currently marketed I-shaped steel capital is the symmetrical shaped steel that two side wing edge thickness are identical, for a side wing edge of not bearing heavy burden, there is the thickness identical with the edge of a wing of load-bearing one side and must cause unnecessary waste of material, thereby cause the increase of crane production cost.
At present, the domestic production I-shaped steel capital is the identical product of two side wing edge thickness, if adopt the method production edge of a wing thickness difference of producing the product that two side wing edge thickness are identical to reach the above product of 4mm, can exceed standard and can not become qualified products because extending inconsistent very large bending and the size of producing, the hot rolling production difficulty be very big.
Summary of the invention
Defect for above-mentioned prior art, the purpose of this utility model is to provide the production line of a kind of hoisting machinery with asymmetric I-steel, production line of the present utility model can effectively be produced the differentiated I-steel qualified products of two side wing edge thickness, and this product is in the situation that guarantee that serviceability effectively reduces cross-sectional area and the every meter weight of crane with I-steel, save the steel use amount in the crane production process, reduce the crane production cost.
To achieve these goals, the utility model has adopted following technical scheme:
The production line of asymmetric I-steel for a kind of hoisting machinery, comprise reversible blooming mill and universal rolling mill group, wherein said reversible blooming mill comprises a plurality of asymmetric passes, each asymmetric pass is two side wing edge thickness differences but the identical asymmetric pass of percentage elongation, and in described omnipotent tandem rolling mill group, the pass of each universal mill is to adopt the different still identical passes of percentage elongation of drafts.Asymmetric pass like this can prevent the rolled piece bending, guarantees the appearance and size precision of product.
In above-mentioned production line, as a kind of preferred embodiment, described reversible blooming mill also comprises the box pass, and this box pass can be rolled into blank the symmetrical base that meets dimensions.
In above-mentioned production line, as a kind of preferred embodiment, described asymmetric pass comprises asymmetric cutting-in hole and asymmetric control hole.Asymmetric cutting-in hole and asymmetric control hole are mainly by the realizing in the reversible blooming mill of assymmetrical deformation maximum, for entering the universal rolling mill group, provide required blank.More preferably, described reversible blooming mill is furnished with a box hole, three asymmetric cutting-in holes and an asymmetric control hole successively.
In above-mentioned production line, as a kind of preferred embodiment, described universal rolling mill group comprises U1, U2, U3, U4, five universal mills of U5 and E1, two edging mills of E2, and order of placement is followed successively by U1, U2, E1, U3, U4, E2, U5.
In above-mentioned production line, as a kind of preferred embodiment, described hoisting machinery comprises web and the edge of a wing that is positioned at described web both sides with asymmetric I-steel, and edge of a wing thickness t 1 and the t2 of described both sides differ 5～10mm, exemplarily can differ 5mm, 6mm, 7mm, 8mm, 9mm, 10mm.
In above-mentioned production line, as a kind of preferred embodiment, described hoisting machinery equates with the flange width of the both sides of asymmetric I-steel.With respect to the identical I-steel of two side wing edge thickness, every meter weight reducing of this I-steel 5～15%.
In above-mentioned production line, as a kind of preferred embodiment, described hoisting machinery is 1.4-2.0 with the edge of a wing Thickness Ratio t1/t2 of the both sides of asymmetric I-steel, can be exemplarily 1.4,1.45,1.46,1.50,1.6,1.7,1.8,1.9, more preferably 1.4-1.51.
Adopt above-mentioned production line to produce the method for above-mentioned hoisting machinery with asymmetric I-steel, comprise following operating procedure:
Step 1, utilize reversible blooming mill to be rolled blank, to roll out, enters the required left-right asymmetry rolled piece of universal mill group;
Step 2, utilize U1, U2, E1, U3, U4, E2, U5 milling train to be rolled to obtain the asymmetric I-steel of described hoisting machinery to described asymmetric rolled piece successively.
When the difference of the rolling mill practice of asymmetric I-steel of the present utility model and common symmetrical I-steel is Factor of The Hot-rolled I-shaped Steel, drafts and the percentage elongation of two side wing edges of universal mill are basically identical, and this product of rolling only percentage elongation is basically identical, two edgings are all not identical, thereby roll out the different product of two side wing edge thickness.
In said method, as a kind of preferred embodiment, the temperature of described blank when entering reversible blooming mill is 1000～1150 ℃, exemplarily can be 1050～1100 ℃, 1080～1130 ℃, 1135～1145 ℃.
In said method, as a kind of preferred embodiment, the rolling pass of described reversible blooming mill is 7～11 passages.It is identical with 3 passes with 3(2 that reversible blooming mill BD walks the 1, the first and second asymmetric cutting-in holes 2, box hole shown in Fig. 2, can only cross one), the 3rd asymmetric cutting-in hole 4, asymmetric control hole 5, wherein the drafts in the first two hole is larger, according to different steel grades, need respectively roll one to three passage, two passages need be rolled in the 3rd asymmetric cutting-in hole 4, to reduce rolling load, asymmetric control hole 5 is because belonging to control hole, and drafts is less, so rolling load not quite can only roll a passage.Therefore BD needs to roll 7～11 passages on the whole.
In said method, as a kind of preferred embodiment, U1 horizontal roller drafts is 4～9mm, and edger roll is 10～15mm to the top side drafts, and edger roll is 8～12mm to the drafts of bottom side; U2 horizontal roller drafts is 2～5mm, and edger roll is 7～12mm to the top side drafts, and edger roll is 6～10mm to the drafts of bottom side; E1 is 10～15mm to the flange width drafts; U3 horizontal roller drafts is 1.5～3.5mm, and edger roll is 5～9mm to the top side drafts, and edger roll is 4～8mm to the drafts of bottom side; U4 horizontal roller drafts is 1.5～3mm, and edger roll is 4～7mm to the top side drafts, and edger roll is 3～6mm to the drafts of bottom side; E2 is 3～8mm to the flange width drafts; U5 horizontal roller drafts is 0～1mm, and edger roll is 1～2mm to the top side drafts, and edger roll is 0～1.5mm to the drafts of bottom side.Specifically set drafts according to different steel grades.
Compared with prior art, the utlity model has following beneficial effect: the I-steel that adopts this production line to obtain is in the situation that guarantee that serviceability effectively reduces cross-sectional area and the every meter weight of crane with I-steel, reduces the crane production cost.In addition, the blooming mill that this production line is used and universal mill all adopt that two side wing edge thickness are different but pass that percentage elongation is identical can prevent the rolled piece bending, guarantees the appearance and size precision of product.
The accompanying drawing explanation
Fig. 1 is the sectional drawing of the asymmetric I-steel of the utility model;
Fig. 2 is that the blooming mill of preferred embodiment of the present utility model is joined roller figure;
Fig. 3 is the universal mill pass schematic diagram of preferred embodiment of the present utility model.
Wherein, description of reference numerals is as follows: the h-web height; The b-flange width; The d-web thickness; The edge of a wing, t1-top average thickness; The edge of a wing, t2-bottom average thickness; The r-inner arc radius; R1-top flange arc radius; 1-box hole; The asymmetric cutting-in of 2-first hole; The asymmetric cutting-in of 3-second hole; 4-the 3rd asymmetric cutting-in hole; The 5-control hole
The specific embodiment
Below in conjunction with specific embodiment, the utility model is further described.Following examples are for setting forth the utility model, but protection domain of the present utility model is not limited in following examples.
Fig. 1 is the sectional drawing of the hoisting machinery that provides of the utility model with asymmetric I-steel, and it comprises web and two side wing edges, and wherein: two side wing edge thickness differ 5～10mm, i.e. the edge of a wing, top average thickness t1-bottom edge of a wing average thickness t2=5～10mm; Described both sides flange width b equates; And the scope of t1/t2 is between 1.4-2.0, more preferably the scope of t1/t2 is between 1.4-1.51, and lacking of too little weight reducing, be difficult to too greatly produce.I-steel of the present utility model is the transformation to common hot rolling I-steel (GB/T706-1988), in the situation that guarantee that serviceability effectively reduces the production cost of crane.
Fig. 2 is that the blooming mill of a preferred embodiment of the utility model is joined roller figure, and it is furnished with 5 passes, is followed successively by the 2, second asymmetric cutting-in hole 3, the 1, first asymmetric cutting-in hole, box hole, the 3rd asymmetric cutting-in hole 4, control hole 5.Box hole 1 is for being rolled into blank the symmetrical base that meets dimensions; The first the 2, second asymmetric cutting-in hole 3, asymmetric cutting-in hole, the 3rd asymmetric cutting-in hole 4 and asymmetric control hole 5 all adopt two side wing edge thickness differences but the identical left-right asymmetry pass of percentage elongation (be pass left and right sides thickness difference but the identical asymmetric pass of percentage elongation).The first asymmetric cutting-in hole 2 is identical with the second asymmetric cutting-in hole 3 passes, and the both sides in asymmetric cutting-in hole shut out the thickness difference of rolled piece, but percentage elongation is identical, and asymmetric control hole is further controlled the shape of rolling piece from asymmetric cutting-in hole.Certainly for the realization in the reversible blooming mill by the assymmetrical deformation maximum, a plurality of boxes hole also can be set, such as 2-4, several asymmetric cutting-ins holes can also be set again more, such as arranging altogether asymmetric cutting-in hole 4-7, control hole also several to arrange more again, such as arranging altogether control hole 2-4.
Fig. 3 is the universal mill pass schematic diagram of a preferred embodiment of the utility model.In the universal mill group, each milling train all adopts both sides gap values between rollers still percentage elongation identical passes different from drafts.
The production of product size I-steel as shown in table 1 of below take describes its production line and production method as example.
Table 1 product size parameter
| Project | h | b | d | t1 | t2 | r | r1 | Area of section | Theoretical weight |
| Size | 294mm | 128mm | 11mm | 20mm | 14mm | 12mm | 5.3mm | 72.79cm 2 | 57.14kg/m |
Production line is as follows: comprise reversible blooming mill and universal rolling mill group (rolling finishing mill group hot rolling production),
This reversible blooming mill is furnished with a box hole, three asymmetric cutting-in holes and an asymmetric control hole successively, as shown in Figure 2.
This universal rolling mill group comprises U1, U2, U3, U4, five universal mills of U5 and E1, two edging mills of E2, and order of placement is followed successively by U1, U2, E1, U3, U4, E2, U5.Because the drafts of front 4 universal mills is larger, the flange width increase is larger, in order to control flange width, change, every two universal mill back follow an E edging mill to control flange width, the U5 drafts is less, and flange width changes little, so do not arrange and add edging mill thereafter, seven rolling mills are full tandem rolling, can effectively improve production efficiency.In the universal mill group, each milling train all adopts both sides gap values between rollers still percentage elongation identical passes (two side wing edges that are universal mill adopt identical rolling percentage elongation) different from drafts, and pass as shown in Figure 3.
Adopt the method for I-steel shown in above-mentioned production line production table 1 as follows:
(1) continuous casting square billet (material Q345) of 240mm * 375mm section is heated to 1100～1110 ℃ through heating furnace;
(2) continuous casting square billet after heating is delivered in blooming mill and carried out split rolling method, the blooming mill rolling schedule is in Table 2, and continuous casting square billet obtains the needed left and right of universal finishing mill group not to rolled piece after blooming mill 8 passage rollings;
Table 2 blooming mill rolling schedule
(3) the asymmetric rolled piece that then utilizes successively U1, U2, E1, U3, U4, E2, U5 milling train to obtain step (2) is rolled to obtain the asymmetric I-steel of described hoisting machinery, and wherein universal rolling mill group rolling procedure is in Table 3.
Table 3 universal rolling mill group rolling procedure table (unit: mm)
With respect to the I-steel of two side wing edge thickness identical (being 20mm), through the I-steel with table 1 specification of above-mentioned production line and production method production, every meter weight reducing 10%; The I-steel of producing produces crooked grade for product defects without assymmetrical deformation substantially, has guaranteed the appearance and size precision of product, and its product quality meets user's instructions for use.In addition, than increase the method for a side wing edge thickness by welding manner, method of the present utility model is direct hot-roll forming, safe than its welding, and the weight that can carry is large.
The purposes that should be appreciated that these embodiment is only for the utility model is described but not be intended to limit protection domain of the present utility model.In addition; also should understand; after having read technology contents of the present utility model, those skilled in the art can make various changes, modification and/or modification to the utility model, within these all equivalent form of values fall within the protection domain that the application's appended claims limits equally.
Claims (2)
1. the production line of asymmetric I-steel for a hoisting machinery, comprise reversible blooming mill and universal rolling mill group, it is characterized in that,
Described reversible blooming mill is furnished with a box hole, three asymmetric cutting-in holes and an asymmetric control hole successively, and described asymmetric cutting-in hole and asymmetric control hole are the different but asymmetric pass that percentage elongation is identical of two side wing edge thickness;
Described universal rolling mill group comprises U1, U2, U3, U4, five universal mills of U5 and E1, two edging mills of E2, and order of placement is followed successively by U1, U2, E1, U3, U4, E2, U5; In described omnipotent tandem rolling mill group, the pass of each universal mill is to adopt the different still identical passes of percentage elongation of drafts;
Described hoisting machinery comprises web with asymmetric I-steel and is positioned at the edge of a wing of described web both sides, edge of a wing thickness t 1 and the t2 of described both sides differ 5～10mm, the edge of a wing Thickness Ratio t1/t2 of described both sides is 1.4-2.0, and the width on the edge of a wing of described both sides equates.
2. production line according to claim 1, is characterized in that, described hoisting machinery is 1.4-1.51 with the edge of a wing Thickness Ratio of the both sides of asymmetric I-steel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320213194 CN203343164U (en) | 2013-04-24 | 2013-04-24 | Production line of asymmetrical joist steel for hoisting machinery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320213194 CN203343164U (en) | 2013-04-24 | 2013-04-24 | Production line of asymmetrical joist steel for hoisting machinery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110665962A (en) * | 2019-08-30 | 2020-01-10 | 河北津西钢板桩型钢科技有限公司 | Pass system and rolling method of narrow-flange asymmetric steel rail beam hot rolling mill |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110665962A (en) * | 2019-08-30 | 2020-01-10 | 河北津西钢板桩型钢科技有限公司 | Pass system and rolling method of narrow-flange asymmetric steel rail beam hot rolling mill |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131218 Termination date: 20180424 |