CN103466466A - U-shape-like cross-section structure of boom, and forming method for bend of U-shape-like cross-section structure - Google Patents
U-shape-like cross-section structure of boom, and forming method for bend of U-shape-like cross-section structure Download PDFInfo
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- CN103466466A CN103466466A CN2013103314491A CN201310331449A CN103466466A CN 103466466 A CN103466466 A CN 103466466A CN 2013103314491 A CN2013103314491 A CN 2013103314491A CN 201310331449 A CN201310331449 A CN 201310331449A CN 103466466 A CN103466466 A CN 103466466A
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Abstract
The invention relates to the production field of a crane boom of an auto crane, and particularly relates to a U-shape-like cross-section structure of a boom, and a forming method for bend of the U-shape-like cross-section structure. The U-shape-like cross-section structure is characterized in that a ratio of height to width of the cross section is H/W=1.21-1.62; the bottom of the lower bending plate is an arc section formed by three arcs comprising two-side arcs (I) and a middle arc (II); one ends of the arcs (I) are tangent to the side wall of the lower bending plate; and the other ends of the arcs (I) are tangent to the arc (II). The forming method for the bend of the U-shaped boom comprises the following steps of 1) determining bending parameters of the arcs (I); 2) determining bending times n of the arc (II); and 3) averaging the arc length of the arc (II) according to the bending times n and finally obtaining the bending parameters of the arc (II). Compared with a conventional method, the forming method for the bend has the advantages of taking advantages of polygons and U-shaped cross sections and simultaneously simplifying the forming method for the bend of the lower bending plate.
Description
Technical field
The present invention relates to the arm production field of car hosit, relate in particular to kind U-shaped arm cross section structure and a bending and molding method thereof.
Background technology
The arm section form of car hosit mainly contains quadrangle, pentagon, hexagon, octagon, dodecagon, U-shaped and ellipse.The polygonal cross-section crane arm generally adopts thick plate structure, and technique is relatively simple, weight phase counterweight, and in the time of lift heavy, rigidity is relatively better.And U-shaped and elliptic cross-section are a kind of comparatively ideal arm section forms, can give full play to the performance of material, good looking appearance, with the obvious advantage when using high strength steel, but its manufacturing process more complicated.
Common crane arm generally adopts U-shaped and polygonized structure at present, the bending parameter of general circular arc bottom U-shaped arm adopts the mode that equilateral polygon section approaches to obtain more, adopt the key of the method establishment bending technique to be: for the ease of calculating bending line size (straight flange that guarantees equilateral polygon overlaps with the straight flange in semicircle jib cross section), and guaranteeing that last one bending is in the centre of jib, the bending passage must be odd number.It is as follows that routine solves the general step of U-shaped cross section jib bending technique:
1) at first, determine the bending passage.Draw the outer equilateral polygon that is cut in semi-circular cross-section, but a round section can have a plurality of equilateral polygon to be cut in it outward, in order to obtain the smooth profile without obvious folding line, need make the arcuate midway point (arc radius value of bending resilience) of this equilateral polygon adjacent edge rounding be not more than 0.6mm to the distance between round section, determine that the limit of equilateral polygon counts N, finally obtain bending passage N/2;
2) secondly, determine the bending line size.According to the equilateral polygon determined, by this polygon adjacent edge rounding (arc radius value of bending resilience), thereby obtain the technological parameter of bending line size;
3) finally, determine the bending angle of per pass bending.Obtain the per pass bending angle according to the bending passage of dividing equally in circular scope, obtained line size and bending angle just can bending and molding.
Summary of the invention
The purpose of this invention is to provide kind U-shaped arm cross section structure and a bending and molding method thereof, get the advantage of polygonal cross-section structure and U-shaped cross section structure, meeting under the prerequisite of reasonable stress, simplify arm cross section structure and bending and molding method thereof, make it simple and feasible, Forming Quality is reliable.
For achieving the above object, the present invention adopts following technical scheme to realize:
One kind U-shaped arm cross section structure, comprise bent plate and lower bent plate, the depth-width ratio in cross section is: H/W=1.21～1.62, described upper bent plate top is provided with two 90 ° of fillets, described lower bent plate bottom is the segmental arc consisted of three sections circular arcs, comprise the circular arc one of both sides and middle circular arc two, an end of circular arc one and lower bent plate sidewall are tangent, and the other end of circular arc one and circular arc two are tangent.
The scope of described radius of rounding R is 25mm ~ 50mm; The radius of described circular arc one R1 is 40mm ~ 100mm, and its central angle alpha scope is 25 ° ~ 40 °.
The bending and molding method of a described kind U-shaped arm, the concrete operation step of its lower bent plate bending and molding is as follows:
1) at first determine bending line size and the bending angle of circular arc one, according to the radius R 1 of circular arc one, select its bending upper die Rm=R1-(5 ~ 10), its bending line size=L+ π α (R1+t/2)/360 °, in formula: L is straight section length, unit is mm; α is circular arc one bending angle, and unit is °; T is steel plate thickness, and unit is mm; The nominal radius that R1 is circular arc one; The radius that Rm is bending upper die;
Secondly 2) determine the bending passage of circular arc two, by the arc length of selected bending upper die Rm envelope, determine that distance between bending line is between 35～40mm scope, the arc section arc length of circular arc two is π β (R2-t/2)/180 °, bending passage
, in formula: the radius that R2 is circular arc two, unit is mm; The bending angle that β is circular arc two, unit is °; T is steel plate thickness, and unit is mm;
The arc length of 3) then according to the numerical value of bending passage n, dividing equally circular arc two, finally draw the bending parameter of bent plate under the jib of class U-shaped cross section: the distance between adjacent bending line is π β (R2-t/2)/180 °/n, the per pass bending angle is β/n, in formula: the radius that R2 is circular arc two, unit is mm; The bending angle that β is circular arc two, unit is °; T is steel plate thickness, and unit is mm.
Compared with the existing methods, the invention has the beneficial effects as follows:
Cross section structure of the present invention is got the advantage of polygonal cross-section structure and U-shaped cross section structure, is meeting under the prerequisite of reasonable stress, has simplified the bending and molding method of arm cross section structure and lower bent plate thereof, and makes the Forming Quality of lower bent plate better.Bending and molding method in the present invention is not only applicable to the present invention's analog-U shaped cross section, but also can solve the bending parameter in the semicircle U-shaped of standard cross section, convenient succinctly feasible, easily grasps.
The accompanying drawing explanation
Fig. 1 is class U-shaped cross section structure schematic diagram of the present invention;
Fig. 2 is that the passage of the embodiment of the present invention is divided schematic diagram;
Fig. 3 is that the bending line of the embodiment of the present invention on plane steel plate distributes.
In figure: bent plate 3-fillet 4-circular arc one 5-circular arc two under the upper bent plate 2-of 1-
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further illustrated:
See Fig. 1, it is the present invention's one kind U-shaped arm cross section structure schematic diagram, comprise bent plate 1 and lower bent plate 2, the depth-width ratio in cross section is: H/W=1.21～1.62, upper bent plate 1 top is provided with two 90 ° of fillets 3, and lower bent plate 2 bottoms are segmental arcs that consist of three sections circular arcs, comprises the circular arc 1 of both sides and middle circular arc 25, one end of circular arc 1 and lower bent plate sidewall are tangent, and the other end of circular arc 1 and circular arc 25 are tangent.The radius of fillet 3 is R25mm ~ 50mm; The radius R1 of circular arc 1 is R40mm ~ 100mm, and its central angle alpha scope is 25 ° ~ 40 °.After the radius R 1 of circular arc 1 is determined, radius R 2 and the central angle β of circular arc 25 are unique.
Above-mentioned class U-shaped cross section can not draw bending line and bending angle size with the bending method of conventional circular arc bottom U-shaped arm, because two starting points that not only can not guarantee circular arc 25 are positioned at outer being cut on the equilateral polygon linear portion of circular arc 25, and can't guarantee the requirement of last one bending in the middle of the cross section of circular arc 25.
The bending and molding method of the present invention's one kind U-shaped arm, the concrete operation step of its lower bent plate bending and molding is as follows:
1) at first, determine bending line size and the bending angle of circular arc one.According to the radius R 1 of circular arc one, select its bending upper die Rm=R1-(5 ~ 10) mm, its bending line size=L+ π α (R1+t/2)/360 °, in formula: L is straight section length, unit is mm; α is circular arc one bending angle, and unit is °; T is steel plate thickness, and unit is mm; The nominal radius that R1 is circular arc one; The radius that Rm is bending upper die;
Secondly 2) determine the bending passage of circular arc two, by the arc length of selected bending upper die Rm envelope, determine that distance between bending line is between 35～40mm scope, the arc section arc length of circular arc two is π β (R2-t/2)/180 °, bending passage
, in formula: the radius that R2 is circular arc two, unit is mm; The bending angle that β is circular arc two, unit is °; T is steel plate thickness, and unit is mm;
The arc length of 3) then according to the numerical value of bending passage n, dividing equally circular arc two, finally draw the bending parameter of bent plate under the arm of class U-shaped cross section: the distance between adjacent bending line is π β (R2-t/2)/180 °/n, the per pass bending angle is β/n, in formula: the radius that R2 is circular arc two, unit is mm; The bending angle that β is circular arc two, unit is °; T is steel plate thickness, and unit is mm.
Suppose in embodiment to adopt R1=50mm, R2=243mm, α=34 °, β=112 °, the welten950 material of t=10mm bends bent plate under class U-shaped jib of the present invention, and its detailed process is:
1) at first determine the bending parameter of circular arc one: due to the rebound resilience of material, the small arc-shaped of pair radius R1=50mm adopts one moulding of patrix R45, obtains first bending parameter: bending line size=L+ π α (R1+t/2)/360 °, bending angle=34 °.
2) secondly determine the bending passage of circular arc two: in order to obtain smooth excessive round section, envelope arc length by selected bending upper die R45, distance between bending line must be within 35～40mm scope, circular arc two arc length of radius R 2: π β (R2-t/2)/180, and bending passage n:
, get n=13, the per pass bending angle is β/n;
See Fig. 2, can determine that the distance between several roads, back bending line is: π β (R2-t/2)/180 °/13=35.8mm, per pass bending angle: β/13=8.62 °.
3) then divide equally circular arc two: according to n=13, circular arc two is divided equally in mapping, sees Fig. 3, finally draws the bending parameter in special U-shaped cross section:
The 1st road: bending line=L+ π α (R1+t/2)/360 °, bending angle=34 °;
The 2nd road: bending line=L+ π α (R1+t/2)/180 °+35.8/2, bending angle=8.62 °;
The 3rd road: bending line=L+ π α (R1+t/2)/180 °+35.8+35.8/2, bending angle=8.62 °;
The 4th road: bending line=L+ π α (R1+t/2)/180 °+35.8*2+35.8/2, bending angle=8.62 °;
The 5th road: bending line=L+ π α (R1+t/2)/180 °+35.8*3+35.8/2, bending angle=8.62 °;
The 6th road: bending line=L+ π α (R1+t/2)/180 °+35.8*4+35.8/2, bending angle=8.62 °;
The 7th road: bending line=L+ π α (R1+t/2)/180 °+35.8*5+35.8/2, bending angle=8.62 °;
The 15th road: bending line=L+ π α (R1+t/2)/180 °+35.8*6+35.8/2, bending angle=8.62 °.
8th～14 road bending parameters and 1st～7 road left-right symmetric, identical, without sewing, stated.
Claims (3)
1. a kind U-shaped arm cross section structure, comprise bent plate and lower bent plate, it is characterized in that, the depth-width ratio in cross section is: H/W=1.21～1.62, described upper bent plate top is provided with two 90 ° of fillets, and described lower bent plate bottom is the segmental arc consisted of three sections circular arcs, comprises the circular arc one of both sides and middle circular arc two, one end of circular arc one and lower bent plate sidewall are tangent, and the other end of circular arc one and circular arc two are tangent.
2. a kind U-shaped arm cross section structure according to claim 1, is characterized in that, the scope of described radius of rounding R is 25mm ~ 50mm; The radius of described circular arc one R1 is 40mm ~ 100mm, and its central angle alpha scope is 25 ° ~ 40 °.
3. the bending and molding method of the described kind U-shaped arm of claim 1, is characterized in that, the concrete operation step of its lower bent plate bending and molding is as follows:
1) at first determine bending line size and the bending angle of circular arc one, according to the radius R 1 of circular arc one, select its bending upper die Rm=R1-(5 ~ 10), its bending line size=L+ π α (R1+t/2)/360 °, in formula: L is straight section length, unit is mm; α is circular arc one bending angle, and unit is °; T is steel plate thickness, and unit is mm; The nominal radius that R1 is circular arc one; The radius that Rm is bending upper die;
Secondly 2) determine the bending passage of circular arc two, by the arc length of selected bending upper die Rm envelope, determine that distance between bending line is between 35～40mm scope, the arc section arc length of circular arc two is π β (R2-t/2)/180 °, bending passage
, in formula: the radius that R2 is circular arc two, unit is mm; The bending angle that β is circular arc two, unit is °; T is steel plate thickness, and unit is mm;
The arc length of 3) then according to the numerical value of bending passage n, dividing equally circular arc two, finally draw the bending parameter of bent plate under the jib of class U-shaped cross section: the distance between adjacent bending line is π β (R2-t/2)/180 °/n, the per pass bending angle is β/n, in formula: the radius that R2 is circular arc two, unit is mm; The bending angle that β is circular arc two, unit is °; T is steel plate thickness, and unit is mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106238517A (en) * | 2016-08-10 | 2016-12-21 | 辽宁瑞丰专用车制造有限公司 | A kind of bending technique of U-shaped cross section jib |
| CN111377366A (en) * | 2018-12-30 | 2020-07-07 | 河南森源重工有限公司 | U-shaped arm body, U-shaped arm body forming method and crane boom |
| CN114406624A (en) * | 2022-02-28 | 2022-04-29 | 山西四建集团有限公司 | Thick steel plate steel structure column square-to-round joint forming process |
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| JP2004149268A (en) * | 2002-10-31 | 2004-05-27 | Tadano Ltd | Boom section for telescopic boom |
| CN2830359Y (en) * | 2005-10-17 | 2006-10-25 | 长沙中联重工科技发展股份有限公司 | Boom of hoister |
| CN202038824U (en) * | 2011-05-03 | 2011-11-16 | 湖南中联重科专用车有限责任公司 | Crane jib and crane with same |
| CN102672014A (en) * | 2012-05-05 | 2012-09-19 | 北京科技大学 | Method for producing cold-formed steel of U-shaped davit arm |
| CN203461722U (en) * | 2013-08-01 | 2014-03-05 | 辽宁瑞丰专用车制造有限公司 | Boom section structure |
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2013
- 2013-08-01 CN CN201310331449.1A patent/CN103466466B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004149268A (en) * | 2002-10-31 | 2004-05-27 | Tadano Ltd | Boom section for telescopic boom |
| CN2830359Y (en) * | 2005-10-17 | 2006-10-25 | 长沙中联重工科技发展股份有限公司 | Boom of hoister |
| CN202038824U (en) * | 2011-05-03 | 2011-11-16 | 湖南中联重科专用车有限责任公司 | Crane jib and crane with same |
| CN102672014A (en) * | 2012-05-05 | 2012-09-19 | 北京科技大学 | Method for producing cold-formed steel of U-shaped davit arm |
| CN203461722U (en) * | 2013-08-01 | 2014-03-05 | 辽宁瑞丰专用车制造有限公司 | Boom section structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106238517A (en) * | 2016-08-10 | 2016-12-21 | 辽宁瑞丰专用车制造有限公司 | A kind of bending technique of U-shaped cross section jib |
| CN111377366A (en) * | 2018-12-30 | 2020-07-07 | 河南森源重工有限公司 | U-shaped arm body, U-shaped arm body forming method and crane boom |
| CN114406624A (en) * | 2022-02-28 | 2022-04-29 | 山西四建集团有限公司 | Thick steel plate steel structure column square-to-round joint forming process |
| CN114406624B (en) * | 2022-02-28 | 2023-10-24 | 山西四建集团有限公司 | Square-to-round joint forming process for thick steel plate steel structure column |
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