CN101269783A - Process for manufacturing suspension arm of crane - Google Patents
Process for manufacturing suspension arm of crane Download PDFInfo
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- CN101269783A CN101269783A CNA2007100384459A CN200710038445A CN101269783A CN 101269783 A CN101269783 A CN 101269783A CN A2007100384459 A CNA2007100384459 A CN A2007100384459A CN 200710038445 A CN200710038445 A CN 200710038445A CN 101269783 A CN101269783 A CN 101269783A
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- seam welded
- straight seam
- crane arm
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Abstract
The invention discloses a manufacturing method of a crane boom. The manufacturing method is as follows: blanks used for manufacturing the crane boom are selected firstly, and the blanks are high-frequency straight seam welded pipes; then the high-frequency straight seam welded pipes are carried out with surface treatment, and the surface treatment technics comprises ball blast, as well as grinding and repairing; then the high-frequency straight seam welded pipes after the surface treatment are painted; finally, the painted high-frequency straight seam welded pipes are assembled into the crane boom. The invention does not need steel plate cutting and multiple passes of press and completely avoids the problems of shape difference, deformation warpage after cutting, multiple passes of molding rebound and uneven, etc. of a steel plate, the process is reduced; the manufacturing period is shortened; the production efficiency is increased. The crane boom can be manufactured when the requirement of the intensity is low, and heat refining can be adopted to quench and temper the high-frequency straight seam welded pipes to increase the intensity when the requirement of the intensity is high. In addition, the manufacturing method can be made by adopting raw materials with low price, and not only reduces the production cost but also can satisfy the needs for manufacturing booms with various intensity levels.
Description
Technical field
The present invention relates to the manufacturing process of hoisting crane, more particularly, relate to a kind of manufacture method of crane arm, this manufacture method can be improved the quality of products, and reduces cost-cutting.
Background technology
The manufacture method more complicated of crane arm, at present, the general hot rolled steel plate that adopts is made crane arm, see also shown in Figure 1, the concrete steps of this method are as follows: at first hot rolled steel plate is cut, generally adopt cutting methods such as mechanical shearing, plasma cutting, flame cut or laser beam cutting; Steel plate after will cutting then carries out the steel pipe that multi-pass is pressed into rectangular tube, pipe, oval tube or other shapes, and can there be a slit in pressure-formed in this way steel pipe; Adopt welding method to make this slit seam again; Then this steel tube surface is carried out the processing of operations such as ball blast, reconditioning and japanning; At last steel pipe and associated components are assembled into crane arm.But there is following shortcoming in this manufacture method:
At first, because generally all there is unrelieved stress to a certain degree in hot rolled steel plate, and just exists the problem of template difference before the steel plate that the has cutting, even template is better before the cutting, but in cutting process and after the cutting, also can make steel plate appearance buckling deformation in various degree because of the release of unrelieved stress.Select for use the armor plate strength rank high more, the problems referred to above are obvious more.In the steel plate multi-pass pressing process of subsequent step, can cause the inhomogeneous of compression moulding because of steel plate template difference, had a strong impact on the rhythm of production and the quality of crane arm.
Secondly, because all there is in various degree intensity non-uniformity in hot rolled steel plate along different directions, in carrying out the multi-pass pressing process, just there is difference in the deformation resilience degree.If the extent of rebound difference is bigger, make troubles then for follow-up compacting.Though advanced at present multi-pass compression molding device all is equipped with the computer controlled automatic program, in program, can suppress springback capacity and compensate steel plate, the randomness of steel plate extent of rebound makes the calling program compensation be difficult to adjust.
In addition, because market is increasing to the demand of high tonnage hoisting crane, the intensity rank of the required steel plate of crane arm is also corresponding to be increased.Yet the intensity rank of the steel plate of selecting for use is high more, and feed stock cost is also just high more, but the quality of machine-shaping is poor more, has so more increased productive costs.
Summary of the invention
, extent of rebound inhomogeneous at the above-mentioned compression moulding that exists in the prior art is difficult to compensation and the too high shortcoming of productive costs, the manufacture method that the purpose of this invention is to provide a kind of crane arm, this manufacture method is simple and convenient, not only improved product design, and reduced productive costs.
For achieving the above object, the present invention adopts following technical scheme:
The concrete steps of the manufacture method of this crane arm are as follows:
A. choose the blank of making crane arm, blank is a high-frequency straight seam welded pipe;
B. the high-frequency straight seam welded pipe in the steps A is carried out surface treatment, process of surface treatment comprises that ball blast and mill repair;
C. the high-frequency straight seam welded pipe after the surface treatment among the step B is painted;
D. the high-frequency straight seam welded pipe after the japanning among the step C is assembled into crane arm.
In steps A:
Described ERW is also carried out whole modified heat treatment.
Described modified heat treatment comprises quenching technical and tempering process.
In steps A:
Choose the blank of making crane arm, blank comprises high-frequency straight seam welded pipe and has the steel pipe in slit vertically, and high-frequency straight seam welded pipe is used to make crane arm; The steel pipe that has the slit vertically is used to make crane arm.
Described high-frequency straight seam welded pipe and the steel pipe that has the slit are vertically also carried out whole modified heat treatment.
Described modified heat treatment comprises quenching technical and tempering process.
High-frequency straight seam welded pipe is carried out surface treatment, and process of surface treatment comprises that ball blast and mill repair;
The steel pipe that has the slit is vertically carried out surface treatment, and process of surface treatment comprises that welding, ball blast and mill repair.
High-frequency straight seam welded pipe after the surface treatment and the steel pipe that has the slit are vertically painted.
High-frequency straight seam welded pipe after the japanning and the steel pipe that has the slit are vertically dressed up crane arm.
In technique scheme, the step of manufacturing of a kind of crane arm of the present invention is: choose the blank of making crane arm earlier, blank is a high-frequency straight seam welded pipe; Then high-frequency straight seam welded pipe is carried out surface treatment, process of surface treatment comprises that ball blast and mill repair; Again the high-frequency straight seam welded pipe after the surface treatment is painted; High-frequency straight seam welded pipe after will painting at last is assembled into crane arm.The present invention need not to carry out steel plate cutting and multi-pass compacting, avoids fully that steel-plate shape is poor, cutting back distortion warpage, multi-pass moulding rebound and unequal problem, and has reduced operation, has shortened the manufacturing cycle, has improved production efficiency.If can directly make to the requirement of crane arm intensity is low, if requirement of strength is higher, can adopt modified heat treatment that high-frequency straight seam welded pipe is quenched and tempering, improve intensity.This method can adopt low-cost raw material to make in addition, has not only reduced productive costs, and can also satisfy the arm demand of making various intensity ranks.
Description of drawings
Fig. 1 is the schematic flow sheet of manufacture method of the crane arm of prior art;
Fig. 2 is the schematic flow sheet of the manufacture method of crane arm of the present invention;
Fig. 3 is the structural representation of high-frequency straight seam welded pipe of the present invention;
Fig. 4 is the structural representation that has the steel pipe in slit vertically of the present invention;
The structural representation of Fig. 5 crane truck arm.
The specific embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
See also shown in Figure 2, the manufacture method concrete steps of crane arm of the present invention are: earlier according to crane arm design-calculated shape, size, choose to corresponding blank, blank is high-frequency straight seam welded pipe 1 (see figure 3), also claims ERW pipe or H-ERW pipe, sees also shown in Figure 5, among Fig. 55 is crane truck, 6 is the one-level arm of crane arm, and one-level arm 6 size maximums are positioned at being connected bottom and with base 8 of arm; The upper end that two, three grades of arms 7 of crane arm and other arms at different levels are positioned at one-level arm 6, size is corresponding to be reduced (crane arm is three grades altogether among Fig. 5), and high-frequency straight seam welded pipe can be used to make whole arms at different levels; Please return Fig. 2, then high-frequency straight seam welded pipe is carried out surface treatment, process of surface treatment comprises that ball blast and mill repair, wherein, Shot Blasting be with shot blasting machine with thin comminuted steel shot or other hard particles high speed jets to surface of the work, to remove iron scale and clean surface, the japanning after being convenient to is handled; Through after the Shot Blasting, palpus is checked workpiece surface quality, if there are material surface defectives such as serious pit or pit, then can repair, the general methods such as putty grinds afterwards again of mending that adopt.Again the high-frequency straight seam welded pipe after the surface treatment is painted; High-frequency straight seam welded pipe after will painting at last is assembled into crane arm.In making the ERW process, according to crane arm design-calculated shape and specification, the high-frequency straight seam welded pipe of choosing can be rectangular tube, pipe, oval tube or other different shapes and specification, if the requirement to crane arm intensity is lower, high-frequency straight seam welded pipe directly can be carried out surface treatment; If required intensity rank is higher, can carry out whole modified heat treatment to high-frequency straight seam welded pipe earlier.Modified heat treatment comprises quenching technical and tempering process, and according to the material composition of blank with to performance demands, the range of temperatures of quenching is 800 ℃～1000 ℃, and the time range of insulation is 1mim/mm～8min/mm; The range of temperatures of tempering is 450 ℃～700 ℃, and the time range of insulation is 1mim/mm～8min/mm.In addition, consider based on quenching degree, if the thickness of making arm below 8mm, can adopt material is the blank of common carbon manganese steel; The thickness of arm is more than 8mm, and can adopt material is the blank of common carbon manganese steel that is added with the alloying element of high-hardenability, adopts these two kinds of feed stock cost low, and after modified heat treatment, the intensity of high-frequency straight seam welded pipe can reach requirement fully.Seeing also high-frequency straight seam welded pipe shown in Figure 3, shown in Figure 31 is the pipe shape, and 2 among Fig. 3 is expressed as the dielectric bonding weld seam, inside and outside do not have burr, by online intermediate frequency heat treatment can make this Weld Performance reach strong with body etc., etc. tough degree; By the modified heat treatment of integral body, then can make weld seam reach effect with the body homogeneity.In assembling process, will assemble respectively according to different size and designing requirement through the high-frequency straight seam welded pipe after the surface treatment, finish the manufacturing of whole crane arm.
See also shown in Figure 2, the manufacture method concrete steps of crane arm of the present invention are: earlier according to crane arm design-calculated shape, size, choose to corresponding blank, blank comprises high-frequency straight seam welded pipe 1 (see figure 3) and has steel pipe 3 (see figure 4)s in slit vertically, high-frequency straight seam welded pipe 1 also claims ERW pipe or H-ERW pipe, the steel pipe 3 that has the slit vertically is without crossing the steel pipe that high frequency straight weld connects, see also shown in Figure 5, among Fig. 55 is crane truck, 6 is the one-level arm of crane arm, one-level arm 6 size maximums are positioned at being connected bottom and with base 8 of arm; The upper end that two, three grades of arms 7 of crane arm and other arms at different levels are positioned at one-level arm 6, size is corresponding to be reduced (crane arm is three grades altogether among Fig. 5).The steel pipe that has the slit vertically is used to make the one-level arm 6 of crane arm, is convenient to the installation of parts.High-frequency straight seam welded pipe is used to make two, three grades and other arms at different levels (except the one-level) of crane arm; Please return Fig. 2, then high-frequency straight seam welded pipe be carried out surface treatment; High-frequency straight seam welded pipe after will painting at last and the steel pipe that has the slit vertically are assembled into crane arm.In making the ERW process, according to crane arm design-calculated shape and specification, high-frequency straight seam welded pipe of choosing and the steel pipe that has the slit vertically can be rectangular tube, pipe, oval tube or other different shapes and specification, if the requirement to crane arm intensity is lower, can be with high-frequency straight seam welded pipe and the steel pipe that has the slit vertically directly carry out surface treatment; If required intensity rank is higher, can be earlier to high-frequency straight seam welded pipe and the steel pipe that has the slit vertically carry out whole modified heat treatment.Modified heat treatment comprises quenching technical and tempering process, and according to the material composition of blank with to performance demands, the range of temperatures of quenching is 800 ℃～1000 ℃, and the time range of insulation is 1mim/mm～8min/mm; The range of temperatures of tempering is 450 ℃～700 ℃, and the time range of insulation is 1mim/mm～8min/mm.In addition, consider based on quenching degree, if the thickness of making arm below 8mm, can adopt material is the blank of common carbon manganese steel; The thickness of arm is more than 8mm, can adopt material is the blank of common carbon manganese steel that is added with the alloying element of high-hardenability, adopt these two kinds of feed stock cost low, after modified heat treatment, high-frequency straight seam welded pipe can reach requirement fully with the intensity that has the steel pipe in slit vertically.Seeing also high-frequency straight seam welded pipe shown in Figure 3, shown in Figure 31 is the pipe shape, and 2 among Fig. 3 is expressed as the dielectric bonding weld seam, inside and outside do not have burr, by online intermediate frequency heat treatment can make this Weld Performance reach strong with body etc., etc. tough degree; By the modified heat treatment of integral body, then can make weld seam reach effect with the body homogeneity.Please consult the steel pipe that has the slit vertically 3 shown in Figure 4, shown in Figure 4 again and also be the pipe shape, 4 among Fig. 4 is expressed as slit vertically.In carrying out surface treatment process, the process of surface treatment of high-frequency straight seam welded pipe is comprised that ball blast and mill repair; The process of surface treatment of the steel pipe that has the slit is vertically comprised that welding, ball blast and mill repair, need to prove that in the present embodiment, welding herein is meant that conventional welding manner is carried out in steel pipe slit vertically to be welded.After this, again high-frequency straight seam welded pipe after the surface treatment and the steel pipe that has the slit are vertically painted; In assembling process, to assemble respectively according to different size and designing requirement through the high-frequency straight seam welded pipe after the surface treatment (arms at different levels of other except that one-level) and with the steel pipe (one-level arm) that has the slit vertically, finish the manufacturing of whole crane arm.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (9)
1. the manufacture method of a crane arm is characterized in that,
The concrete steps of this method are as follows:
A. choose the blank of making crane arm, blank adopts high-frequency straight seam welded pipe;
B. the high-frequency straight seam welded pipe in the steps A is carried out surface treatment, process of surface treatment comprises that ball blast and mill repair;
C. the high-frequency straight seam welded pipe after the surface treatment among the step B is painted;
D. the high-frequency straight seam welded pipe after the japanning among the step C is assembled into crane arm.
2. the manufacture method of crane arm as claimed in claim 1 is characterized in that, in steps A:
Described ERW is also carried out whole modified heat treatment.
3. the manufacture method of crane arm as claimed in claim 2 is characterized in that, described modified heat treatment comprises quenching technical and tempering process.
4. the manufacture method of crane arm as claimed in claim 1 is characterized in that: in steps A:
Choose the blank of making crane arm, blank comprises high-frequency straight seam welded pipe and has the steel pipe in slit vertically, and high-frequency straight seam welded pipe is used to make crane arm; The steel pipe that has the slit vertically is used to make crane arm.
5. the manufacture method of crane arm as claimed in claim 4 is characterized in that:
Described high-frequency straight seam welded pipe and the steel pipe that has the slit are vertically also carried out whole modified heat treatment.
6. the manufacture method of crane arm as claimed in claim 5 is characterized in that:
Described modified heat treatment comprises quenching technical and tempering process.
7. the manufacture method of crane arm as claimed in claim 4 is characterized in that:
High-frequency straight seam welded pipe is carried out surface treatment, and process of surface treatment comprises that ball blast and mill repair;
The steel pipe that has the slit is vertically carried out surface treatment, and process of surface treatment comprises that welding, ball blast and mill repair.
8. the manufacture method of crane arm as claimed in claim 7 is characterized in that:
High-frequency straight seam welded pipe after the surface treatment and the steel pipe that has the slit are vertically painted.
9. the manufacture method of crane arm as claimed in claim 8 is characterized in that,
High-frequency straight seam welded pipe after the japanning and the steel pipe that has the slit are vertically dressed up crane arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100384459A CN101269783B (en) | 2007-03-23 | 2007-03-23 | Process for manufacturing suspension arm of crane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100384459A CN101269783B (en) | 2007-03-23 | 2007-03-23 | Process for manufacturing suspension arm of crane |
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| CN101269783A true CN101269783A (en) | 2008-09-24 |
| CN101269783B CN101269783B (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007100384459A Active CN101269783B (en) | 2007-03-23 | 2007-03-23 | Process for manufacturing suspension arm of crane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030274A (en) * | 2010-05-24 | 2011-04-27 | 韶关市起重机厂有限责任公司 | Jib arm structure of lorry-mounted crane |
| CN110052792A (en) * | 2019-05-09 | 2019-07-26 | 江苏淮龙装备科技有限公司 | A kind of manufacturing method of hydraulic cylinder cylinder barrel |
-
2007
- 2007-03-23 CN CN2007100384459A patent/CN101269783B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030274A (en) * | 2010-05-24 | 2011-04-27 | 韶关市起重机厂有限责任公司 | Jib arm structure of lorry-mounted crane |
| CN110052792A (en) * | 2019-05-09 | 2019-07-26 | 江苏淮龙装备科技有限公司 | A kind of manufacturing method of hydraulic cylinder cylinder barrel |
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| Publication number | Publication date |
|---|---|
| CN101269783B (en) | 2011-06-15 |
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