GB2403172A - Method of forming a metal box section - Google Patents
Method of forming a metal box section Download PDFInfo
- Publication number
- GB2403172A GB2403172A GB0313966A GB0313966A GB2403172A GB 2403172 A GB2403172 A GB 2403172A GB 0313966 A GB0313966 A GB 0313966A GB 0313966 A GB0313966 A GB 0313966A GB 2403172 A GB2403172 A GB 2403172A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wall part
- box section
- boom
- offset
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Jib Cranes (AREA)
Abstract
A method of forming a metal box section comprises: ```providing a first wall part 13 and a second wall part 22, the first wall part 13 having an offset part 16 at an edge thereof; ```locating the second wall part 22 adjacent to the first wall part 13 such that the offset part 16 is disposed alongside the second wall part 22; and ```forming a weld 31 to join the first wall part 13 and the second wall part 22. The method is preferably used to join two elements 11,12. Each element 11,12 may have a first wall part 13 with an offset part 16 and a second wall part 22 (as shown), or alternatively one element (12'; figure 4) may have two offset parts (16'a, 16'b; figure 4), while the other element (11'; figure 4) has no offset parts. The method is preferably used in the manufacture of a boom for a material handling vehicle.
Description
PATENTS ACT 1977 A10856GB-RAL Title: Method of Forming Metal Box Section
Description of Invention
This invention relates to a method of forming a metal box section, particularly but not exclusively for a boom for a material handling vehicle.
Booms for material handling vehicles comprise elongate members having a box section, to provide the desired strength and likeness and also to permit provision of telescopic booms where required. It is known to form such booms by providing a channel-shaped member and welding a flat plate across the open mouth of the channel-shaped member to form a closed box section.
To permit the flat plate to be welded across the mouth of the channelshaped section, the width of the plate must be such that it either extends beyond the limbs of the channel shaped member or may be received within the channel shaped member. A weld is then formed in the angle between the flat plate and the respective limb of the channel-shaped element.
This has the advantages that the flat plate and channel-shaped member may be made from different thicknesses_of metal or different metals as appropriate to provide the desired overall characteristics of the final boom.
This technique also avoids the problems of attempting to weld two abutting edges, which demands skill on the part of the welder and a backing part to prevent the filler metal escaping out of the joints during the welding process, andlor requires shaping the abutting edges to provide a wedge shaped channel to receive the weld.
However, the weld is not located on the neutral axis of the boom and thus the weld is subject to stresses and deformation during loading of the boom.
The limiting design factor is therefore the fatigue life of the welded joint rather than the yield strength of the flat plate and channel-shaped member materials.
It is also disadvantageous in that the boom may therefore have two projecting lips running along either side of the boom, which provide locations where dirt can sit and also provide a constraint when forming telescopic booms. Further, conventionally, the channel-shaped member is formed by pressing and the internal bend radius is approximately four times the material thickness. This creates a problem when wear pads are mounted within the boom to support a further section of a telescopic boom, since it is preferable to locate wear pads at the internal corners of the boom and the internal bend radius provided an obstruction.
An aim of the present invention is to provide a new or improved method of forming box section, particularly but not exclusively for a boom for a material handling vehicle.
According to a first aspect of the invention we provide a method of forming a metal box section, the method comprising the steps of; providing a first wall part and a second wall part, the first wall part having an offset part at an edge thereof, locating the second wall part adjacent to the first wall part such that the offset part is disposed alongside the second wall part, and forming a weld to join the first wall part and the second wall part.
The step of locating a first wall part adjacent the second wall part may comprise disposing the first wall part and the second wall part in a generally co planar configuration.
The box section may comprise a first element and a second element, wherein the first wall part may be provided on the first element and the second wall part may be provided on the second element.
The first element may comprise a first wall part and a second wall part and the second element may comprise a first wall part and a second wall part, and the method may comprise the step of locating the first wall part of the first element adjacent the second wall part of the second element and locating the second wall part of the first element adjacent the first wall part of the second element.
The first element and second element may comprise channel-shaped elements.
The method according may comprise the step of forming at least one of the first element and the second element from a flat blank.
The step of forming at least one of the first element and the second element from a flat blank may comprise rolling the flat blank.
The offset part may provide a backing element to the weld.
The first wall part and second wall part may be of generally the same depth.
According to a second aspect of the invention we provide a metal box section, the box section having a first wall part and a second wall part, the first wall part having an offset part at an edge thereof, the second wall part being located adjacent to the first wall part such that the offset part is disposed alongside the second wall part, and a weld joining the first wall part and the second wall part.
The first wall part and the second wall part may be disposed in a generally co-planar configuration.
The box section may comprise a first element and a second element, wherein the first wall part is provided on the first element and the second wall part is provided on the second element.
The first element may comprise a first wall part and a second wall part and the second element may comprise a first wall part and a second wall part, wherein the first wall part of the first element may be located adjacent the second wall part of the second element and the second wall part of the first element may be located adjacent the first wall part of the second element.
The first element and second element may comprise channel-shaped elements.
According to a third aspect of the invention we provide a boom for a material handling vehicle comprising a box section according to the second aspect of the invention or where made by a method according to the first aspect of the invention.
The weld may lie substantially on the neutral axis of the boom.
The invention will now be described by way of example only with reference to the accompanying drawings wherein; Figure 1_ is a side view of a boom embodying the present invention, Figure lb is a section on line A-A of Figure la, Figure 2a is a side view of a first boom element, Figure 2_ is a plan view of the boom element of Figure 2_, Figure 2_ is an end view of the boom element of Figure 2_, Figure 3_ is a side view of a second element, Figure 3b is a plan view of the boom element of Figure 3_, Figure 3c is an end view of the boom element of Figure 3g, and Figure 4 is a sectional view of a further boom embodying the present 1 5 invention Referring now to the Figures, a boom is shown generally at 10 formed from a box section having a first element 11 and a second element 12. As shown in Figures 2_, 2b and 2_, the first element 11 is of generally channel shaped configuration provided with a first wall 13 and a second wall 14 connected by a web part 15. The first wall part 13 and the second wall part 14 are generally parallel, and are both generally perpendicular to the web part 15.
An offset part 16 as best seen in Figure 2 is offset from the plane of the first wall part 13 in the direction of the second wall part 14 by a distance approximately equal to the thickness of the first wall part 13. The offset part 16 is thus connected to the first wall part 13 by a inclined part 17.
By way of example, the boom may be for a material handling vehicle such as a side-arm loader vehicle, or a telescopic arm loader vehicle, a crane or any other material handling vehicle as appropriate.
To provide fixing positions, apertures generally shown at 18 are provided in the web 15, first wall part 13 and second wall part 14 as desired. In the present example, the first wall part 13 and second wall part 14 are also provided with cut outs 19 to provide part of an aperture in the final boom 10.
Referring now to Figures 3_, 3b and 3_, the second element 12 is also of channel shape having a first wall part 21 and a second wall part 22 connected by a web 23. As in the first element 11 the first wall part 21 and the second wall part 22 are generally parallel and are generally perpendicular to the web part 23. At an edge thereof the first wall part 21 is provided with an offset part 24 in like manner to the offset part 16, displaced out of the plane of the first wall part 21 in the direction of the second wall part 22 by a distance approximately equal to the thickness of the first wall part 21, such that the offset part 24 and first wall part 21 are connected by an inclined part 29.
As with the first element 11, apertures 26 are provided in the web 23, first wall part 21 and second wall part 22 as required. Cut outs 25 are provided in the first side wall 21 and second side wall 22 in like manner to those of the first element 11.
To form the boom 10, as best seen in Figure lb the first element 11 and second element 12 are engaged in a mutually inverted configuration. The first wall part 13 of the first element 11 is disposed in a generally coplanar configuration with the second wall part 22 of the second element 12 and disposed such that the offset part 16 lies alongside an edge part of the second element 22. Similarly, the first wall part 21 of the second element 12 is disposed in generally co-planar relationship with the second wall part 14 of the first element 11, again such that the offset part 24 is disposed alongside an edge ofthe second wall part 14. A weld is then formed along the recesses 30 defined by the respective first wall part 13, 21, second wall part 14, 22 and offset part 16, 24 and inclined parts 17, 29 forming a welding bead 31. The completed boom 10 may then be attached to a material handling vehicle or a sub- assembly thereof as appropriate using the fixing points 18, 26 or apertures 32 defined by the alignment of cut outs 19, 25 provided on the first element 11 and second element 12.
The present method is advantageous in that the provision of an offset part at the edge of the first wall part to engage the second wall part permits the accurate and simple alignment of the first wall parts and the second wall parts relative to one another and allows for relative adjustment of the first and second wall parts prior to forming the weld. Further, the offset part 16, 24 lies behind the junction between the first wall parts and second wall parts, forming a backing element to the weld and permitting a high quality weld to be formed without the necessity for locating an appropriate stop behind the junction between the first wall part and second wall part to prevent the filler metal running away from the joint. Instead, the filler metal remains within the recess 30, thus forming a well defined bead 31. There is also no requirement to shape the edges of the wall parts to provide a recess for a weld.
The weld 30 in this example lies substantially on the neutral axis of the boom, since the first wall parts 13, 21 and second wall parts 14, 22 are of generally the same depth. As such, the weld 30 is not subject significant stress or strain when the boom 10 is loaded and as such the design limited factor is not the fatigue life of the weld but rather the yield strength of the elements 11, 12. This permits higher yield strength material and/or a reduced thickness of material to be used. This permits the weight of the boom to be reduced and/or its performance improved, with consequent reductions in cost.
In the present example, it is clear that the first element 11 and second element 12 may be formed by folding a flat blank to an appropriate shape, preferably by rolling but by other means if required, for example by pressing, folding or otherwise. Rolling imposes less stress on the material since the bending is progressive and gradual, unlike pressing, and so allows a smaller bend radius for a given thickness of material, typically about equal to the material thickness. By providing the weld 31 on the neutral axis, as discussed above, thinner material may be used to form the elements 11, 12, thus reducing the internal radius of the corners and simplifying the location of wear pads within the boom.
The first and second element may be made of an appropriate material such as steel.
In the present example, fixing apertures 18, 26 are provided in the elements 11, 12 prior to assembly, either before or after rolling the flat blank. It will be apparent that the assembled boom 10 may be machined or cut or otherwise worked on after assembly if desired. Particularly, it might be envisaged that the apertures 32 may be provided after joining the first element 11 and second element 12 to avoid any problems in aligning the cut outs 25, 19.
It might further be envisaged that a boom may be formed from two identical elements, which may then subsequently be cut to give a boom shape such as that shown in Figure 1_.
Although the present example of the boom 10 is shown as being assembled from two elements 11, 12, it will be apparent that, for example, that a boom may be formed by folding a single blank through four right angles and providing one edge of the blank with an offset part such as that shown at 16 or 24. A single weld would then be sufficient to join the free ends of the folded blank, rather than the two joins shown in the present example.
Further alternatively, it will be apparent that both offset parts may be provided on the same element. As shown in Figure 4, element 11' comprises a simple channel in cross section, whilst element 12' comprises offset parts 16'a, 16'b, at an edge of each of its wall parts. This embodiment would require the elements 11', 12' to be manufactured to a higher tolerance to permit accurate engagement of the elements.
It will be apparent that a method according to the present invention may be used to form a box section for any appropriate purpose, such as a construction element such as a girder or any other application. Although the box section shown in the figures and described above is generally square in section, the box section may be rectangular or polygonal with any number of sides as desired for a particular application.
In the present specification "comprises" means "includes or consists of" and "comprising" means "including or consisting of".
The features disclosed in the foregoing description, or the following claims, or the accompanying drawings, expressed in their specific forms or in terms of a means for performing the disclosed function, or a method or process for attaining the disclosed result, as appropriate, may, separately, or in any combination of such features, be utilised for realising the invention in diverse forms thereof.
Claims (20)
1. A method of forming a metal box section, the method comprising the steps of; providing a first wall part and a second wall part, the first wall part having an offset part at an edge thereof, locating the second wall part adjacent to the first wall part such that the offset part is disposed alongside the second wall part, and forming a weld to join the first wall part and the second wall part.
2. A method according to claim 1 wherein the step of locating a first wall part adjacent the second wall part comprises disposing the first wall part and the second wall part in a generally co-planar configuration.
3. A method according to claim 1 or claim 2 wherein the box section comprises a first element and a second element, wherein the first wall part is provided on the first element and the second wall part is provided on the second element.
4. A method according to claim 3 wherein the first element comprises a first wall part and a second wall part and the second element comprises a first wall part and a second wall part, wherein the method comprises the step of locating the first wall part of the first element adjacent the second wall part of the second element and locating the second wall part of the first element adjacent the first wall part of the second element.
5. A method according to claim 3 or claim 4 wherein the first element and second element comprise channel-shaped elements.
6. A method according to any one of claims 3 to 5 comprising the step of forming at least one of the first element and the second element from a flat I blank.
7. A method according to claim 6 wherein the step of forming at least one of the first element and the second element from a flat blank comprises rolling 3 the flat blank.
8. A method according to any one of the preceding claims wherein the offset part provides a backing element to the weld.
9. A method according to any one of the preceding claims wherein the first wall part and second wall part are of generally the same depth.
10. A method substantially as described herein and/or with reference to the accompanying drawings.
11. A metal box section, the box section having a first wall part and a second wall part, the first wall part having an offset part at an edge thereof, the second wall part being located adjacent to the first wall part such that the offset part is disposed alongside the second wall part, and a weld joining the first wall part and the second wall part. t
12. A box section according to claim 11 wherein the first wall part and the second wall part are disposed in a generally co-planar configuration.
13. A box section according to claim 1 1 or claim 12 wherein the box section] comprises a first element and a second element, wherein the first wall part is provided on the first element and the second wall part is provided on the second element.
14. A box section according to claim 13 wherein the first element comprises a first wall part and a second wall part and the second element comprises a first wall part and a second wall part, wherein the first wall part of the first element is located adjacent the second wall part of the second element and the second wall part of the first element is located adjacent the first wall part of the second element.
15. A box section according to claim 13 or claim 14 wherein the first element and second element comprise channel-shaped elements.
16. A box section substantially as described herein and/or with reference to the accompanying drawings.
17. A boom for a material handling vehicle comprising a box section according to any one of claims 11 to 16 or where made by a method according to any one claims 1 to 10.
18 A boom for a material handling vehicle according to claim 17 where the weld lies substantially on the neutral axis of the boom
19. A boom for a material handling vehicle substantially as described herein, and/or with reference to the accompanying drawings.
20. Any novel feature or novel combination of features described herein and/or in the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0313966A GB2403172A (en) | 2003-06-17 | 2003-06-17 | Method of forming a metal box section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0313966A GB2403172A (en) | 2003-06-17 | 2003-06-17 | Method of forming a metal box section |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0313966D0 GB0313966D0 (en) | 2003-07-23 |
| GB2403172A true GB2403172A (en) | 2004-12-29 |
Family
ID=27636672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0313966A Withdrawn GB2403172A (en) | 2003-06-17 | 2003-06-17 | Method of forming a metal box section |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2403172A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1997961A1 (en) * | 2006-03-13 | 2008-12-03 | Yanmar Co., Ltd. | Boom for excavation machine |
| CN102249170A (en) * | 2011-07-15 | 2011-11-23 | 徐州徐工特种工程机械有限公司 | Main jib structure for fork installing machine |
| CN107206858A (en) * | 2015-02-12 | 2017-09-26 | 杰富意钢铁株式会社 | The manufacture method of the joint construction of press-formed part, the automobile structural member with the joint construction and attachment |
| EP4144937A4 (en) * | 2020-07-14 | 2024-06-05 | Sany Automobile Manufacturing Co., Ltd. | BOOM, BOOM ARRANGEMENT AND WORKING MACHINE |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB462070A (en) * | 1935-12-24 | 1937-03-02 | Projectile & Engineering Compa | Improvements in or relating to built-up box-section girders or frame members |
| GB1296926A (en) * | 1969-03-18 | 1972-11-22 | ||
| AU6392473A (en) * | 1973-02-20 | 1975-06-26 | Wellington R F | Pipe offset |
| US4002000A (en) * | 1975-06-30 | 1977-01-11 | Palmer-Shile Company | Beam construction and method of manufacture |
| GB2308564A (en) * | 1995-12-28 | 1997-07-02 | Mannesmann Ag | Box section girders |
| WO2002060614A1 (en) * | 2001-01-31 | 2002-08-08 | Innowork Oy | A method for manufacturing box girder, a box girder and a constructional part therefor |
-
2003
- 2003-06-17 GB GB0313966A patent/GB2403172A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB462070A (en) * | 1935-12-24 | 1937-03-02 | Projectile & Engineering Compa | Improvements in or relating to built-up box-section girders or frame members |
| GB1296926A (en) * | 1969-03-18 | 1972-11-22 | ||
| AU6392473A (en) * | 1973-02-20 | 1975-06-26 | Wellington R F | Pipe offset |
| US4002000A (en) * | 1975-06-30 | 1977-01-11 | Palmer-Shile Company | Beam construction and method of manufacture |
| GB2308564A (en) * | 1995-12-28 | 1997-07-02 | Mannesmann Ag | Box section girders |
| WO2002060614A1 (en) * | 2001-01-31 | 2002-08-08 | Innowork Oy | A method for manufacturing box girder, a box girder and a constructional part therefor |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1997961A1 (en) * | 2006-03-13 | 2008-12-03 | Yanmar Co., Ltd. | Boom for excavation machine |
| EP1997961A4 (en) * | 2006-03-13 | 2013-03-27 | Yanmar Co Ltd | Boom for excavation machine |
| CN102249170A (en) * | 2011-07-15 | 2011-11-23 | 徐州徐工特种工程机械有限公司 | Main jib structure for fork installing machine |
| CN102249170B (en) * | 2011-07-15 | 2013-06-12 | 徐州徐工特种工程机械有限公司 | Main jib structure for fork installing machine |
| CN107206858A (en) * | 2015-02-12 | 2017-09-26 | 杰富意钢铁株式会社 | The manufacture method of the joint construction of press-formed part, the automobile structural member with the joint construction and attachment |
| EP3257690A4 (en) * | 2015-02-12 | 2018-03-14 | JFE Steel Corporation | Structure for bonding press-molded article, structural article for automobile having said bonding structure, and method for manufacturing bonded article |
| CN107206858B (en) * | 2015-02-12 | 2020-05-19 | 杰富意钢铁株式会社 | Joining structure of press-formed parts, structural part for automobile having the joining structure, and method for manufacturing the joining part |
| EP4144937A4 (en) * | 2020-07-14 | 2024-06-05 | Sany Automobile Manufacturing Co., Ltd. | BOOM, BOOM ARRANGEMENT AND WORKING MACHINE |
| US12221796B2 (en) | 2020-07-14 | 2025-02-11 | Sany Automobile Manufacturing Co., Ltd. | Boom, boom assembly and work machine |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0313966D0 (en) | 2003-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |