CN104028598A - Corrugated pipe machining process - Google Patents
Corrugated pipe machining process Download PDFInfo
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- CN104028598A CN104028598A CN201410246709.XA CN201410246709A CN104028598A CN 104028598 A CN104028598 A CN 104028598A CN 201410246709 A CN201410246709 A CN 201410246709A CN 104028598 A CN104028598 A CN 104028598A
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- 238000003754 machining Methods 0.000 title abstract description 9
- 238000009987 spinning Methods 0.000 claims abstract description 170
- 238000000034 method Methods 0.000 claims abstract description 51
- 238000000137 annealing Methods 0.000 claims abstract description 6
- 238000005516 engineering process Methods 0.000 claims description 42
- 238000007493 shaping process Methods 0.000 claims description 11
- 238000005482 strain hardening Methods 0.000 claims description 8
- 230000008030 elimination Effects 0.000 claims description 2
- 238000003379 elimination reaction Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000015572 biosynthetic process Effects 0.000 abstract 2
- 238000007669 thermal treatment Methods 0.000 abstract 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 37
- 238000003466 welding Methods 0.000 description 17
- 230000035611 feeding Effects 0.000 description 13
- 239000000463 material Substances 0.000 description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 208000034189 Sclerosis Diseases 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Abstract
The invention discloses a corrugated pipe machining process which comprises the following steps: 1, forming a short thick-wall tube blank into a long thin-wall tube by using a power spinning forming process; 2, performing thermal treatment on the long thin-wall tube obtained in the step 1 to eliminate machining hardening, wherein the condition of thermal treatment is complete annealing; 3, performing necking-down formation on the long thin-wall tube obtained in the step 2 by using a necking-down spinning process. The corrugated pipe machining process has the beneficial effects that not only are longitudinal weld joints of tunnel tube components thoroughly eliminated, but also the annular weld joints of a product are greatly reduced, the formation precision is high, and product assembling is facilitated; the pass percent and the machining efficiency of a product are greatly improved, and the production cost of the product is lowered; in the spinning process, crystalline grains are refined, the product is good in quality, and the service life is greatly prolonged.
Description
Technical field
The present invention relates to metal pipe material processing technique field, particularly a kind of bellows processing technology.
Background technology
The moulding process of bellows comprises hydroforming, rolling forming and welding forming etc.Hydroforming is the most frequently used manufacturing process of bellows, utilizes the fluid pressure in pipe, makes pipe bulging in limit collar, until there is surrender along hoop, and then compress pipe to required length, and minor diameter bellows is adopted in this way more.Rolling forming process is mainly used in machining large bellows, is to rely on the rolling forming that is located at the form wheel in pipe, can single ripple rolling be shaped, and some devices also can the several ripples of once-forming.The bellows of hydroforming and rolling forming, its ripple is all that deformed area bears tension by formed by inner-pressure expansion, structure property, stability and to bear interior pressure performance all poor.The bellows excessive for wave height or waveform is special, the punch welding technique that adopts more, in the time that wave height oversteps the extreme limit, material percentage elongation has not allowed to adopt integral forming process, or because of waveform complexity, when monolithic molding is extremely difficult, also adopt welding formings, this class bellows, owing to can not bearing interior pressure, is not too applicable to do the compliant section of expansion joint more.
The tunneltron generally using is at present that merogenesis is shaped, more piece welding obtains, and each trifle is processed respectively, then adopts welding procedure that many trifles are welded as a whole.The specification requirement of tunneltron is that caliber is greater than 250mm, thickness of pipe wall 2.7～3.5mm, wave height 10～15mm, because caliber is large, the thickness of pipe is thin, wave height is higher, make the processing technology to each trifle at present, the traditional handicraft method of adopt " circle-welding of sheet material beading-volume " more, selecting thickness is the sheet material of 2.7～3.5mm, on sheet material, suppress waveform, then by the sheet material volume circle after compacting waveform, connecting portion is welded, obtain a trifle, finally more multiple trifle welding are obtained to tunneltron 1, as shown in Figure 1.The thickness that is greater than the tubing of 250mm due to the external diameter of producing is at present 15～25mm, therefore, selecting thickness is that the technique that the sheet material of 2.7～3.5mm adopts " circle-welding of sheet material beading-volume " to manufacture tunneltron becomes the most economic, effective manufacturing process at present.
Adopt the classical production process of " circle-welding of sheet material beading-volume ", mainly contain following technique shortcoming: (1) welding region 2 easily produces stress and concentrates, the fatigue strength of product is reduced, welded seam area may produce micro-crack and expand in long-term storage process, affects the service life of product; (2) longitudinal seam of One's name is legion, circumferential welded seam, especially intersects weld seam, makes the welding quality of tunneltron be difficult to ensure, according to designing requirement, the weldquality of product will absolutely detect, and weld seam detection efficiency is low and expense is very high; (3) due to the limitation of this process own, each trifle length is shorter, is mainly at present in 1100mm, and this makes the joint number of tunneltron more, processing technology complexity, and production efficiency is low; (4) in welding process, deformation of products is larger, and product shaping precision and uniformity are poor.Therefore, not only forming accuracy is poor, working (machining) efficiency is low, production cost is high for the product that traditional handicraft method is manufactured, and the most important thing is that product quality reliability is poor, cannot meet the designing requirement of product.
Chinese patent 91106244.0, a kind of bellows processing method and equipment are disclosed, drive pipe blank rotary by lathe, spinning wheel is feeding spinning radially, simultaneously two plasmatorch are to the heating of heating of pipe blank district, and axial compressive force head is axially exerted pressure along pipe, after a Waveform shaping, spinning wheel is a mobile ripple square vertically, carries out next waveform spinning.But the bellows of the object of its processing be outer diameter D little (60～110mm), wall thickness δ large (3.5～5mm), therefore, it is not suitable for the processing that caliber is greater than the bellows of 250mm, thickness of pipe wall 2.7～3.5mm.Chinese patent 200810021178.9, a kind of copper corrugated pipe helical corrugation forming apparatus and forming technology thereof are disclosed, copper pipe is hard copper pipe, on this former, establishes roller devices, establishes three and carry out rolling and processing at the uniform pair of rollers copper pipe of the circumferencial direction of described copper pipe on roller devices; Identical angle of the equal deflection of vertical direction of three rollers and the axis of copper pipe, this angle is the lead angle of copper pipe helical corrugation.But the object of its processing is the bellows on air-conditioning equipment, because the outside diameter of bel on air-conditioning equipment is little, therefore it is not suitable for the bellows that processing caliber is greater than 250mm, thickness of pipe wall 2.7～3.5mm equally.Adopt the said equipment processing caliber to be greater than the bellows of 250mm, thickness of pipe wall 2.7～3.5mm, in forming process, all exist because caliber is large, wall thickness is prone to deformation defect, can not complete the processing of tunneltron.
In the face of current situation, study that a kind of product shaping quality is good, production cost is low and simple, tunneltron method for manufacturing parts becomes these those skilled in the art technical barrier in the urgent need to address now efficiently.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art, provide that a kind of operation is simple, forming quality good, forming accuracy and the high bellows processing technology of working (machining) efficiency.
Object of the present invention is achieved through the following technical solutions: a kind of bellows processing technology, and it comprises the following steps:
S1, employing shear spinning forming technology, be configured as length thin tube by short heavy wall pipe;
S2, the length thin tube that step S1 is obtained are heat-treated elimination work hardening, and heat treated condition is full annealing;
S3, the length thin tube that step S2 is obtained adopt necking in technique to carry out necking down shaping.
The caliber of the length thin tube that described step S1 obtains is greater than 250mm, and wall thickness is 2.7～3.5mm.
The method of operating of the shear spinning forming technology in described step S1 is: heavy wall pipe is installed on the core of spinning machine, core drives heavy wall pipe blank rotary, the spinning roller A of spinning machine rolls heavy wall pipe and makes axial feed motion, makes the attenuation recline core and become needed length thin tube continuously of heavy wall pipe.
Described shear spinning forming technology comprises 3～4 passage spinning, and each passage reduction is 25%～40%, and axial feed rate is 1.5～3.0mm/r, and core rotating speed is 60r/min～120r/min.
Described shear spinning forming technology adopts three spinning roller A spinning, and three spinning roller A are circumferentially uniform along core, and the operating angle of spinning roller A is 15 °～30 °, and the receding angle of spinning roller A is 25 °～35 °, and the radius of corner of spinning roller A is 0.4t
0～1t
0, t
0for the original wall thickness of heavy wall pipe.
The method of operating of the necking in technique in described step S3 is: the length thin tube that step S2 is obtained is installed on the main shaft of spinning machine, and the tail end of length thin tube is applied to an axial thrust force, drive length thin tube to rotate by main shaft, the speed of mainshaft is 50r/min～100r/min, adopt three spinning roller B rotary press modellings, three spinning roller B are circumferentially uniform along core, the synchronously radially feeding of three spinning roller B of spinning machine, radial feed speed is 0.5～5.0mm/s, the tube wall of length thin tube is carried out to spinning, after spinning roller B after side waveform rotary press modelling, start to do axial feed motion, axial feed rate is 1～2mm/r, when the trough of spinning reaches after predetermined length, stop axial feed, three spinning roller B synchronously radially return, again after waveform width of feeding vertically, stop axial feed, three spinning roller B subsynchronous radially feedings again, carry out next one circulation.
Described axial thrust force F=0.3 σ S～0.7 σ S, wherein, σ is the yield strength of thin-walled pipe, S is the cross-sectional area of thin-walled pipe.
The spinning roller B external diameter φ=0.5D～2D of described necking in process using, D is the external diameter at finished product bellows part trough place, the edge of spinning roller B is made up of three sections of circular arcs that connect in turn the profile that the plane of the revolution axial line of spinning roller B intercepts excessively, the circular arc A that described three sections of circular arcs are top and the circular arc B and the circular arc C that are symmetricly set in circular arc A both sides, radius R 1=1t～3t of circular arc A, t is the wall thickness of length thin tube, the radius R of circular arc B and circular arc C
0=1.0 R～1.2R, R is the radius of corner on finished product bellows waveform top.
The present invention has the following advantages:
Good product quality: the present invention has not only thoroughly removed the longitudinal seam of tunneltron part, and because the length of the tunnel bellows of spinning process processing is not subject to process technology limit, be far longer than in the 1100mm that existing technique length only can reach, can greatly reduce the circumferential welded seam of product.The forming accuracy of new technology is higher simultaneously, is convenient to Product Assembly.And, compared with traditional handicraft, product grain refinement in spinning process that new technology is shaped, metallographic structure even compact, greatly improve service life.
Yield rate improves: owing to having cancelled longitudinal seam, this process can thoroughly be avoided occurring longitudinally and circumferential welded seam intersecting area on product, circumferential welded seam greatly reduces and can adopt automatic soldering technique, greatly reduces welding difficulty, has improved the qualification rate of product.
Owing to having reduced weld seam welding capacity, make the corresponding minimizing of workload of welding, weld seam detection and polishing operation, thereby improved working (machining) efficiency, and can save a large amount of welding material expenses and weld seam detection expense, reduce the production cost of product.
Brief description of the drawings
Fig. 1 is the structural representation of prior art converted products
Processing structure schematic diagram when Fig. 2 is shear spinning shaping of the present invention
Right TV structure schematic diagram when Fig. 3 is shear spinning shaping of the present invention
The structural representation of the spinning roller A that Fig. 4 adopts while being shear spinning shaping of the present invention
Processing structure schematic diagram when Fig. 5 is necking in of the present invention
Right TV structure schematic diagram when Fig. 6 is necking in of the present invention
The structural representation of the spinning roller B that Fig. 7 adopts while being necking in of the present invention
Fig. 8 is the local structure for amplifying schematic diagram of spinning roller B
Fig. 9 is the structural representation of processed finished products of the present invention
In figure, 1-tunneltron, 2-welding region, 3-core, 4-spinning roller A, 5-line part A, 6-top arc sections, 7-line part B, 8-main shaft, 9-traction motor, 10-spinning roller B, 11-circular arc A, 12-circular arc B, 13-circular arc C.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described, and protection scope of the present invention is not limited to the following stated:
embodiment 1:
A kind of bellows processing technology, it comprises the following steps:
S1, as shown in Figure 2 and Figure 3, adopts shear spinning forming technology, and short heavy wall pipe is configured as to length thin tube; Heavy wall blank tube material is 5A03(LF3), revolving front blank condition of heat treatment is O state, heavy wall blank pipe range L=650mm, inner diameter d=264.6mm, wall thickness t
0=10mm, the wall thickness of the length thin tube that described step S1 obtains is 3mm, the inner diameter d=247mm of trough place, the outer diameter D=253mm of finished product bellows, the radius of corner R=13.2mm on finished product bellows waveform top;
S2, the length thin tube that step S1 is obtained are heat-treated, heat treated condition is full annealing, and heating-up temperature is 390 DEG C～420 DEG C, insulation 50～70min, stove is chilled to 170～180 DEG C, to eliminate work hardening, after shear spinning, preform blank can produce sclerosis, if directly carry out necking in spindown, product is easy to produce fracture, therefore before necking in spindown need preform blank to heat-treat carrying out, eliminates work hardening;
S3, as shown in Figure 5, Figure 6, the length thin tube that step S2 is obtained adopts necking in technique to carry out necking down shaping.
As shown in Figure 2 and Figure 3, the method of operating of the shear spinning forming technology in described step S1 is: heavy wall pipe is installed on the core 3 of spinning machine, blank is held out against on core 3 with tail jacking block, core 3 drives heavy wall pipe blank rotary, the spinning roller A4 of spinning machine rolls heavy wall pipe and makes axial feed motion, makes the attenuation recline core 3 and become needed length thin tube continuously of heavy wall pipe.
According to the required precision of process conditions and workpiece size, total reduction is 70%, and the shear spinning forming technology in the present embodiment comprises 3 passage spinning, the first passage reduction 30%, and feed rate is 1.6mm/r; The second passage reduction 30%, feed rate is 1.8mm/r; The 3rd passage reduction 39%, feed rate is 1.5mm/r, core 3 rotating speeds are 75r/min.
As shown in Figure 2 and Figure 3, described shear spinning forming technology adopts three spinning roller A4 spinning, and three spinning roller A4 are circumferentially uniform along core 3, and its radial load is balance mutually, and deformed area becomes sub-circular, and workpiece size, shape and surface quality are better.As shown in Figure 4, the operating angle of spinning roller A4 is 20 °, and the receding angle of spinning roller A4 is 30 °, and the radius of corner of spinning roller A4 is 6mm, t
0for the original wall thickness of heavy wall pipe, the edge that is spinning roller A4 is made up of three sections of line part A5, top arc sections 6 and line part B7 that connect in turn the profile that the plane of the revolution axial line of spinning roller B10 intercepts excessively, the angle of line part A5 and spinning roller revolution axial line is 20 °, the radius of top arc sections 6 is 6mm, and the angle of line part A5 and spinning roller revolution axial line is 30 °.
As Fig. 5, shown in Fig. 6, the method of operating of the necking in technique in described step S3 is: one end of the length thin tube that step S2 is obtained is installed on the main shaft 8 of spinning machine, install a traction motor 9 is set at the other end of length thin tube, by traction motor 9, the tail end of length thin tube is applied to an axial thrust force, this axial thrust force can reduce the axial wrinkling trend in bellows forming process greatly, improve forming limit, drive length thin tube rotation by main shaft 8, main shaft 8 rotating speeds are 60r/min, adopt three spinning roller B10 rotary press modellings, three spinning roller B10 are circumferentially uniform along core 3, the synchronously radially feeding of three spinning roller B10 of spinning machine, radial feed speed is 0.5～5.0mm/s, the tube wall of length thin tube is carried out to spinning, after spinning roller B10 after side waveform rotary press modelling, start to do axial feed motion, axial feed rate is 2mm/r, when the trough of spinning reaches after predetermined length, stop axial feed, three spinning roller B10 synchronously radially return, again after waveform width of feeding vertically, stop axial feed, three spinning roller B10 subsynchronous radially feedings again, carry out next one circulation, finally obtain tunneltron 1, as shown in Figure 9.
Described axial thrust force F=7 ton.
As shown in Figure 7, Figure 8, the spinning roller B10 external diameter φ=300mm of described necking in process using, the edge of spinning roller B10 is made up of three sections of circular arcs that connect in turn the profile that the plane of the revolution axial line of spinning roller B10 intercepts excessively, the circular arc A11 that described three sections of circular arcs are top and the circular arc B12 and the circular arc C 13 that are symmetricly set in circular arc A11 both sides, the radius R of circular arc A11
1=6mm, the radius R of circular arc B12 and circular arc C 13
0=16.2mm, can be shaped preferably bellows-shaped and avoid the unstable phenomenon in crest region of this spinning roller.
embodiment 2:
A kind of bellows processing technology, it comprises the following steps:
S1, as shown in Figure 2 and Figure 3, adopts shear spinning forming technology, and short heavy wall pipe is configured as to length thin tube; Heavy wall blank tube material is 5A03(LF3), revolving front blank condition of heat treatment is O state, heavy wall blank pipe range L=650mm, inner diameter d=264.6mm, wall thickness t
0=10mm, the wall thickness of the length thin tube that described step S1 obtains is 2.7mm, the inner diameter d=244.6mm of trough place, the outer diameter D=250mm of finished product bellows, the radius of corner R=16.2mm on finished product bellows waveform top;
S2, the length thin tube that step S1 is obtained are heat-treated, heat treated condition is full annealing, and heating-up temperature is 400 DEG C, insulation 60min, stove is chilled to 170 DEG C, to eliminate work hardening, after shear spinning, preform blank can produce sclerosis, if directly carry out necking in spindown, product is easy to produce fracture, therefore before necking in spindown need preform blank to heat-treat carrying out, eliminates work hardening;
S3, as shown in Figure 5, Figure 6, the length thin tube that step S2 is obtained adopts necking in technique to carry out necking down shaping.
As shown in Figure 2 and Figure 3, the method of operating of the shear spinning forming technology in described step S1 is: heavy wall pipe is installed on the core 3 of spinning machine, blank is held out against on core 3 with tail jacking block, core 3 drives heavy wall pipe blank rotary, the spinning roller A4 of spinning machine rolls heavy wall pipe and makes axial feed motion, makes the attenuation recline core 3 and become needed length thin tube continuously of heavy wall pipe.
According to the required precision of process conditions and workpiece size, total reduction is 73%, and the shear spinning forming technology in the present embodiment comprises four-pass spinning, the first passage reduction 30%, and feed rate is 3mm/r, core 3 rotating speeds are 100r/min; The second passage reduction 30%, feed rate is 3mm/r, core 3 rotating speeds are 100r/min; The 3rd passage reduction 26.5%, feed rate is 2.3mm/r, core 3 rotating speeds are 100r/min; Four-pass reduction 25%, feed rate is 1.34mm/r, core 3 rotating speeds are 75r/min.
As shown in Figure 2 and Figure 3, described shear spinning forming technology adopts three spinning roller A4 spinning, and three spinning roller A4 are circumferentially uniform along core 3, and its radial load is balance mutually, and deformed area becomes sub-circular, and workpiece size, shape and surface quality are better.As shown in Figure 4, the operating angle of spinning roller A4 is 15 °, the receding angle of spinning roller A4 is 25 °, the radius of corner of spinning roller A4 is 4mm, the edge that is spinning roller A4 is made up of three sections of line part A5, top arc sections 6 and line part B7 that connect in turn the profile that the plane of the revolution axial line of spinning roller B10 intercepts excessively, the angle of line part A5 and spinning roller revolution axial line is 15 °, and the radius of top arc sections 6 is 4mm, and the angle of line part A5 and spinning roller revolution axial line is 25 °.
As Fig. 5, shown in Fig. 6, the method of operating of the necking in technique in described step S3 is: one end of the length thin tube that step S2 is obtained is installed on the main shaft 8 of spinning machine, install a traction motor 9 is set at the other end of length thin tube, by traction motor 9, the tail end of length thin tube is applied to an axial thrust force, this axial thrust force can reduce the axial wrinkling trend in bellows forming process greatly, improve forming limit, drive length thin tube rotation by main shaft 8, main shaft 8 rotating speeds are 50r/min, adopt three spinning roller B10 rotary press modellings, three spinning roller B10 are circumferentially uniform along core 3, the synchronously radially feeding of three spinning roller B10 of spinning machine, radial feed speed is 0.5～5.0mm/s, the tube wall of length thin tube is carried out to spinning, after spinning roller B10 after side waveform rotary press modelling, start to do axial feed motion, axial feed rate is 1.5mm/r, when the trough of spinning reaches after predetermined length, stop axial feed, three spinning roller B10 synchronously radially return, again after waveform width of feeding vertically, stop axial feed, three spinning roller B10 subsynchronous radially feedings again, carry out next one circulation, finally obtain tunneltron 1, as shown in Figure 9.
Described axial thrust force F=7 ton.
As shown in Figure 7, Figure 8, the spinning roller B10 external diameter φ=500mm of described necking in process using, the edge of spinning roller B10 is made up of three sections of circular arcs that connect in turn the profile that the plane of the revolution axial line of spinning roller B10 intercepts excessively, the circular arc A11 that described three sections of circular arcs are top and the circular arc B12 and the circular arc C 13 that are symmetricly set in circular arc A11 both sides, the radius R of circular arc A11
1=8.1mm, the radius R of circular arc B12 and circular arc C 13
0=16.2mm, can be shaped preferably bellows-shaped and avoid the unstable phenomenon in crest region of this spinning roller.
embodiment 3:
A kind of bellows processing technology, it comprises the following steps:
S1, as shown in Figure 2 and Figure 3, adopts shear spinning forming technology, and short heavy wall pipe is configured as to length thin tube; Heavy wall blank tube material is 5A03(LF3), revolving front blank condition of heat treatment is O state, heavy wall blank pipe range L=650mm, inner diameter d=264.6mm, wall thickness t
0=12mm, the wall thickness of the length thin tube that described step S1 obtains is 3.5mm, the inner diameter d=246mm of trough place, the outer diameter D=253mm of finished product bellows, the radius of corner R=13.2mm on finished product bellows waveform top;
S2, the length thin tube that step S1 is obtained are heat-treated, heat treated condition is full annealing, and heating-up temperature is 390 DEG C, insulation 70min, stove is chilled to 180 DEG C, to eliminate work hardening, after shear spinning, preform blank can produce sclerosis, if directly carry out necking in spindown, product is easy to produce fracture, therefore before necking in spindown need preform blank to heat-treat carrying out, eliminates work hardening;
S3, as shown in Figure 5, Figure 6, the length thin tube that step S2 is obtained adopts necking in technique to carry out necking down shaping.
As shown in Figure 2 and Figure 3, the method of operating of the shear spinning forming technology in described step S1 is: heavy wall pipe is installed on the core 3 of spinning machine, blank is held out against on core 3 with tail jacking block, core 3 drives heavy wall pipe blank rotary, the spinning roller A4 of spinning machine rolls heavy wall pipe and makes axial feed motion, makes the attenuation recline core 3 and become needed length thin tube continuously of heavy wall pipe.
According to the required precision of process conditions and workpiece size, total reduction is 68%, and the shear spinning forming technology in the present embodiment comprises 3 passage spinning, the first passage reduction 40%, and feed rate is 1.6mm/r, core 3 rotating speeds are 120r/min; The second passage reduction 29%, feed rate is 1.8mm/r, core 3 rotating speeds are 100r/min; The 3rd passage reduction 25%, feed rate is 1.5mm/r, core 3 rotating speeds are 60r/min.
As shown in Figure 2 and Figure 3, described shear spinning forming technology adopts three spinning roller A4 spinning, and three spinning roller A4 are circumferentially uniform along core 3, and its radial load is balance mutually, and deformed area becomes sub-circular, and workpiece size, shape and surface quality are better.As shown in Figure 4, the operating angle of spinning roller A4 is 30 °, and the receding angle of spinning roller A4 is 35 °, and the radius of corner of spinning roller A4 is 12mm, t
0for the original wall thickness of heavy wall pipe, the edge that is spinning roller A4 is made up of three sections of line part A5, top arc sections 6 and line part B7 that connect in turn the profile that the plane of the revolution axial line of spinning roller B10 intercepts excessively, the angle of line part A5 and spinning roller revolution axial line is 30 °, the radius of top arc sections 6 is 12mm, and the angle of line part A5 and spinning roller revolution axial line is 35 °.
As Fig. 5, shown in Fig. 6, the method of operating of the necking in technique in described step S3 is: one end of the length thin tube that step S2 is obtained is installed on the main shaft 8 of spinning machine, install a traction motor 9 is set at the other end of length thin tube, by traction motor 9, the tail end of length thin tube is applied to an axial thrust force, this axial thrust force can reduce the axial wrinkling trend in bellows forming process greatly, improve forming limit, drive length thin tube rotation by main shaft 8, main shaft 8 rotating speeds are 100r/min, adopt three spinning roller B10 rotary press modellings, three spinning roller B10 are circumferentially uniform along core 3, the synchronously radially feeding of three spinning roller B10 of spinning machine, radial feed speed is 0.5～5.0mm/s, the tube wall of length thin tube is carried out to spinning, after spinning roller B10 after side waveform rotary press modelling, start to do axial feed motion, axial feed rate is 1mm/r, when the trough of spinning reaches after predetermined length, stop axial feed, three spinning roller B10 synchronously radially return, again after waveform width of feeding vertically, stop axial feed, three spinning roller B10 subsynchronous radially feedings again, carry out next one circulation, finally obtain tunneltron 1, as shown in Figure 9.
Described axial thrust force F=7 ton.
As shown in Figure 7, Figure 8, the spinning roller B10 external diameter φ=126.5mm of described necking in process using, the edge of spinning roller B10 is made up of three sections of circular arcs that connect in turn the profile that the plane of the revolution axial line of spinning roller B10 intercepts excessively, the circular arc A11 that described three sections of circular arcs are top and the circular arc B12 and the circular arc C 13 that are symmetricly set in circular arc A11 both sides, the radius R of circular arc A11
1=3.5mm, the radius R of circular arc B12 and circular arc C 13
0=14.5mm, can be shaped preferably bellows-shaped and avoid the unstable phenomenon in crest region of this spinning roller.
Claims (8)
1. a bellows processing technology, is characterized in that: it comprises the following steps:
S1, employing shear spinning forming technology, be configured as length thin tube by short heavy wall pipe;
S2, the length thin tube that step S1 is obtained are heat-treated elimination work hardening, and heat treated condition is full annealing;
S3, the length thin tube that step S2 is obtained adopt necking in technique to carry out necking down shaping.
2. a kind of bellows processing technology according to claim 1, is characterized in that: the caliber of the length thin tube that described step S1 obtains is greater than 250mm, and wall thickness is 2.7～3.5mm.
3. a kind of bellows processing technology according to claim 1, it is characterized in that: the method for operating of the shear spinning forming technology in described step S1 is: heavy wall pipe is installed on the core (3) of spinning machine, core (3) drives heavy wall pipe blank rotary, the spinning roller A(4 of spinning machine) roll heavy wall pipe and make axial feed motion, make heavy wall pipe attenuation the core that reclines (3) and become needed length thin tube continuously.
4. a kind of bellows processing technology according to claim 1, it is characterized in that: described shear spinning forming technology comprises 3～4 passage spinning, each passage reduction is 25%～40%, and axial feed rate is 1.5～3.0mm/r, and core (3) rotating speed is 60r/min～120r/min.
5. a kind of bellows processing technology according to claim 1, it is characterized in that: described shear spinning forming technology adopts three spinning roller A(4) spinning, three spinning roller A(4) circumferentially uniform along core (3), spinning roller A(4) operating angle be 15 °～30 °, spinning roller A(4) receding angle be 25 °～35 °, spinning roller A(4) radius of corner be 0.4t
0～1t
0, t
0for the original wall thickness of heavy wall pipe.
6. a kind of bellows processing technology according to claim 1, it is characterized in that: the method for operating of the necking in technique in described step S3 is: the length thin tube that step S2 is obtained is installed on the main shaft (8) of spinning machine, and the tail end of length thin tube is applied to an axial thrust force, drive length thin tube rotation by main shaft (8), main shaft (8) rotating speed is 50r/min～100r/min, adopt three spinning roller B(10) rotary press modelling, three spinning roller B(10) circumferentially uniform along core (3), three spinning roller B(10 of spinning machine) synchronously radially feeding, radial feed speed is 0.5～5.0mm/s, the tube wall of length thin tube is carried out to spinning, spinning roller B(10) after after side waveform rotary press modelling, start to do axial feed motion, axial feed rate is 1～2mm/r, when the trough of spinning reaches after predetermined length, stop axial feed, three spinning roller B(10) synchronously radially return, again after waveform width of feeding vertically, stop axial feed, three spinning roller B(10) subsynchronous radially feeding again, carry out next one circulation.
7. a kind of bellows processing technology according to claim 6, is characterized in that: described axial thrust force F=0.3 σ S～0.7 σ S, and wherein, σ is the yield strength of thin-walled pipe, S is the cross-sectional area of thin-walled pipe.
8. a kind of bellows processing technology according to claim 6, it is characterized in that: the spinning roller B(10 of described necking in process using) external diameter φ=0.5D～2D, D is the external diameter at finished product bellows part trough place, spinning roller B(10) edge by crossing spinning roller B(10) the profile that intercepts of the plane of revolution axial line formed by three sections of circular arcs that connect in turn, the circular arc A(11 that described three sections of circular arcs are top) and be symmetricly set in circular arc A(11) the circular arc B(12 of both sides) and circular arc C (13), circular arc A(11) radius R 1=1t～3t, t is the wall thickness of length thin tube, circular arc B(12) and the radius R of circular arc C (13)
0=1.0 R～1.2R, R is the radius of corner on finished product bellows waveform top.
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| CN104028598B (en) | 2016-04-20 |
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