CN203484467U - Manufacturing equipment for large-pipe-diameter titanium corrugated pipe and corrugated pipe - Google Patents
Manufacturing equipment for large-pipe-diameter titanium corrugated pipe and corrugated pipe Download PDFInfo
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- CN203484467U CN203484467U CN201320587745.3U CN201320587745U CN203484467U CN 203484467 U CN203484467 U CN 203484467U CN 201320587745 U CN201320587745 U CN 201320587745U CN 203484467 U CN203484467 U CN 203484467U
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Abstract
The utility model discloses manufacturing equipment for a large-pipe-diameter titanium corrugated pipe and the corrugated pipe in the technical field of application of titanium alloy. The manufacturing equipment for the large-pipe-diameter titanium corrugated pipe comprises an axial pulling-pressing forming mechanism and a radial positioning mechanism, a pipe to be machined is arranged in the radial positioning mechanism and is connected with the axial pulling-pressing forming mechanism, and compressed air passages are arranged inside the axial pulling-pressing forming mechanism and the radial positioning mechanism respectively. By means of the manufacturing equipment for the large-pipe-diameter titanium corrugated pipe, corrugated grooves can be manufactured in the large-pipe-diameter titanium pipe to meet high requirements of aircrafts and the like, the manufactured large-pipe-diameter titanium corrugated pipe is made of commercial pure titanium TA1 annealing-state materials, the pipe diameter is 175-325mm, the wall thickness is 2.5mm, and the GB/T3624-1995 national standard is met.
Description
Technical field
The utility model relates to a kind of device of titanium alloy applied technical field, specifically a kind of Large Diameter Pipeline titanium corrugated pipe manufacturing equipment and bellows thereof.
Background technology
To the current manufacturing process of Large Diameter Pipeline titanium bellows, be to use two blocks of made groove slabs to mill out longitudinal interface, be then welded.Such manufacturing process is required great effort very much, and owing to existing weld seam to increase stress corrosion chance, has reduced the quality of part.In some pipes, some relatively dark grooves can thicken (to 10%) in shaped region tip material, and larger is tangentially thickening and reaching 15%.For this cause, in flute surfaces, form orange peel shape, sometimes also there will be crackle.This is difficult to tolerance for high request parts such as aircraft.
Through the retrieval of prior art is found, Chinese patent literature CN101418878, open day 2009-04-29, a kind of titanium or titanium alloy bellows manufacture method is disclosed, it carries out in the steps below: a. makes the pipe of a sealing by titanium or titanium alloy seamless pipe or welded tube, and at one end leaves inflation inlet; B. pipe is packed in the mould of multilayer film structure; C. the hot forming temperature to pure titanium or titanium alloy by heating of pipe blank; D. in pipe, be filled with gas, the pressure that is filled with gas is 1～1.5MPa, makes the outside bulging of pipe; E. at mould shaft to applying compressive load, make each module pressing; F. continue increases air pressure in pipe, makes its pressure reach 2.5～5.0MPa, makes pipe be full of die forming completely, finally by cooling and demolding, makes finished product.But defect and the deficiency of this technology are: 1. on workpiece, leave weld seam, easily cause stress corrosion, therefore, to requiring high occasion to be difficult to meet instructions for use.2. handwork single-piece production, be not mechanization production, thereby productivity ratio is low, and cost is high, is difficult to guarantee the accuracy of manufacture.
Chinese patent literature CN1383943, open day 2002-12-11, discloses a kind of " method of titanium alloy corrugated pipe superplastic forming ", comprising: a. makes pipe, titanium alloy seamless pipe or welded tube is made to the pipe of a sealing, and at one end leave inflation inlet; B. heating process, packs pipe in the mould of multilayer film structure, subsequently by heating of pipe blank to 650～1000 ℃ of the superplastic forming temperature of titanium alloy; C. Bulging Process is filled with gas in pipe, and the pressure that is filled with gas is 0.1～1MPa, makes the outside bulging of pipe; D. matched moulds process, to applying compressive load, makes each module pressing at mould shaft; E. forming process, continue increases air pressure in pipe, makes its pressure reach 1.5～3.0MPa, makes the complete mold filling of pipe, finally by cooling and demolding, makes finished product.
Above-mentioned two technical schemes all will be welded after base heating in multiple layers of molds, pass into pressed gas expansion damascene trench.Only solved titanium alloy corrugated-type expansion joint and manufactured a difficult problem, but production efficiency is extremely low, single-piece production at least needs 1～2 day; Owing to adopting a plurality of node monolithic molding simultaneously, die size is large, complex-shaped, manufacturing cost is high, heating energy loss is large; During inflatable, also to carry out the seal operation of mould, seam crossing.This patent, except above-mentioned deficiency, also must be carried out on expensive superplastic forming special equipment; Also will before bulging, carry out superplasticity processing, technique is numerous and diverse.
Chinese patent literature CN101856687A; open day 2010-10-13; disclose a kind of corrugated pipe single-bellow continuous device and manufacturing process, this technology pushes away correspondence on mould by two and has the first through hole and the second through hole, and in each first through hole and the second through hole, correspondence is provided with an insulation sleeve; By forcing press, exert pressure, make to push away the resistance that mould overcomes spring, along guide post, move right, the short transverse of prima is increased, width dwindles, and continues to be filled with inert gas, until waveform reaches design size.But this technical pattern is comparatively complicated, and its magneticaction relating to is by pulse current, to realize in coil.The former reason charge circuit of magnetic pulse formation and discharge loop form.To determine the distribution of electromagnetic force the coil that design adapts with it according to the needs at workpiece deformation position, the cooperation of this device be had relatively high expectations, the more difficult high parts of required precision of producing.
Utility model content
The utility model, for prior art above shortcomings, proposes a kind of Large Diameter Pipeline titanium corrugated pipe manufacturing equipment, can on the titanium pipe of Large Diameter Pipeline, make damascene trench, meets the high request bellowss such as aircraft.
The utility model is achieved through the following technical solutions:
The utility model relates to a kind of Large Diameter Pipeline titanium corrugated pipe making apparatus, comprise: axial push-pull builder and radial positioning mechanism, wherein: tubing to be processed is arranged in radial positioning mechanism and is connected with axial push-pull builder, and axial push-pull builder provides power and radial positioning mechanism inside to be provided with compressed air path by hydraulic cylinder.
Described radial compaction mechanism comprises: be arranged at the divided die mechanism of tubing to be processed outside and upright cylinder and the horizontal air cylinder being attached thereto, by upright cylinder and horizontal air cylinder compressed air charge and discharge realization can divide die mechanism treat processing tubing location.
Described axial push-pull builder comprises: stay pipe, piston rod and hydraulic cylinder, wherein: a side end of piston rod is connected with hydraulic cylinder piston, and stay pipe is socketed on the outside of piston rod.
Described divided die mechanism comprises: be arranged at the elastomer of tubing to be processed inside, half die that lays respectively at tubing to be processed outside and support bar and the taper bush that is set in turn in half die outside, elastomeric inner surface contacts with piston rod by middle steel sleeve.
Between described elastomer and piston rod, be provided with the middle steel sleeve of tubular structure, half of this elastic body shim diameter is the more than 2～3 times of the shaping groove degree of depth, to guarantee that this elastic body shim has enough wear-out lifes.
The internal diameter of half described die is determined in the following manner:
wherein: D is tube outer diameter to be processed; σ
1for correspondence tubing tangential deformation to be processed tangential stress value; E is tubing elastic modelling quantity;
Under tubing groove molding condition to be processed, when tangential deformation has maximum, for can adopting trench region tangential stress, Practical Calculation equals strength degree, i.e. σ
1=σ
b, the error of calculation is no more than 10% conventionally;
Outside half die internal diameter trench region, within the scope of elastic deformation limit, even increased tubing rebound value, adopt intensity to equal material flow stress, i.e. σ
1=σ
0.2.
Roughness Ra=0.63～2.5 μ the m of the working surface of half described die, this half die is in two directions centered by pin, and on a die joint, one and half are molded into a pin, and another half module has corresponding aperture.
The outside of half described die is provided with guide pad and leads for double die, under the effect of upper and lower two upright cylinders and two horizontal air cylinders in left and right, press to tubing to be processed, by means of the cone boss on taper bush and support bar, under two upright cylinder actions, keep operating pressure state.
The in-house stop that is provided with of described radial compaction, this stop comprises: run through successively the nut, cutting taper sheath and the compress gasket that are arranged at piston rod left end, wherein: the end face of compress gasket is realized face with cutting taper sheath with the elastomer in radial positioning mechanism respectively with bottom surface and contacted, the external cylindrical surface of compress gasket is realized face with the inwall of tubing to be processed and is contacted.
Between described compress gasket and described elastomer, be provided with feed cover, the axial both ends of the surface of this feed cover contact with elastomer surface with compress gasket respectively, and radial surface is realized face with the inwall of tubing to be processed and contacted.By this feed cover, can provide the required tubing being provided by frictional force of axial push-pull shaping to supply with.
Described piston rod is provided with to be forced for base device, and this pressure contacts with the end of tubing to be processed for a side of base device; Described pressure comprises for base device: run through be successively arranged on piston rod for base internal gasket, shaping sleeve, for the outer pad of base and cutting pad, wherein: the both sides for base internal gasket fit tightly with the end of compression sleeve and tubing to be processed respectively; By this pressure, for base device, can realize and in the reliable situation of tubing intensity, increase considerably the axial push-pull needed pulling force that is shaped.
The utility model relates to the Large Diameter Pipeline titanium bellows that said apparatus prepares, and its diameter is 150～400mm, and wall thickness is less than or equal to 3mm.
Described Large Diameter Pipeline titanium bellows is preferably titanium tube TA1 annealed state material, caliber 175～325mm, and wall thickness 2.5mm, meets GB/T3624-1995 national standard.
Described Large Diameter Pipeline titanium bellows, be shaped further factory length of the groove by two end face bend pipe reaches the bellows of 4000mm; As add long draw and can further manufacture longer bellows.
Technique effect
Compared with prior art, the utility model for lateral trench in flexible member forming tube, due to coercively fed groove deformed region tubing, so that increases warp-wise distortion compression stress by two kinds of radial positioning mechanisms, guarantees greatly to reduce material attenuation.Its result has improved part strength, reliability and service life.
Accompanying drawing explanation
Fig. 1 a is gas-liquid device front view;
Fig. 1 b is gas-liquid device left view;
Fig. 2 is the local enlarged diagram of Fig. 1 a;
Fig. 3 is groove deformed region distortion distribution sketch map on pipe;
Fig. 4 is that in embodiment, feed is enclosed within the schematic diagram in process;
In figure: a) reset condition schematic diagram, b) process end of a period stage schematic diagram.
Fig. 5 forces the schematic diagram in process for base device in embodiment;
In figure: a) reset condition schematic diagram, b) process end of a period stage schematic diagram.
The specific embodiment
Below embodiment of the present utility model is elaborated; the present embodiment is implemented take technical solutions of the utility model under prerequisite; provided detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
As shown in Figure 1a, the present embodiment Large Diameter Pipeline titanium corrugated pipe making apparatus comprises: axial push-pull builder 1 and radial positioning mechanism 2, wherein: tubing 3 to be processed is arranged in radial compaction mechanism 2 and is connected with axial push-pull builder 1, in axial push-pull builder 1, in hydraulic cylinder, communicates be provided with compressed air path 4 with radial compaction mechanism 2 inside with hydraulic oil.
As shown in Fig. 1 a and Fig. 1 b; described radial compaction mechanism 2 comprises: be arranged at the divided die mechanism 5 of tubing to be processed 3 outsides and the upright cylinder 6 being attached thereto and horizontal air cylinder 7, by upright cylinder and horizontal air cylinder compressed air charge and discharge realization can divide die mechanism treat processing tubing location.
As shown in Fig. 1 a and Fig. 1 b; described divided die mechanism 5 comprises: be arranged at the elastomer 0 of tubing to be processed 3 inside, support bar 9 and the taper bush 10 that lays respectively at half die 8 in tubing to be processed 3 outsides and be set in turn in half die 8 outsides, the inner surface of elastomer 0 contacts with piston rod 15.
As shown in Figure 2, between described elastomer 0 and piston rod 15, be provided with the middle steel sleeve 11 of tubular structure, make when Large Diameter Pipeline groove is shaped, same device gonosome 0 gasket pressure of being hit by a bullet effectively improves, avoid elastomer 0 packing ring wall thickness too thick, poor rigidity, the defect of pressure decreased simultaneously.Half of the diameter of this elastomer 0 packing ring is the more than 2～3 times of the shaping groove degree of depth, to guarantee that pad has enough wear-out lifes.
The internal diameter of half described die 8 is determined in the following manner:
wherein: D is tubing 3 external diameters to be processed; σ
1for correspondence tubing 3 tangential deformation tangential stress values to be processed; E is tubing elastic modelling quantity.
Under tubing 3 groove molding conditions to be processed, when tangential deformation has maximum, for can adopting trench region tangential stress, Practical Calculation equals strength degree (σ
1=σ
b), the error of calculation is no more than 10% conventionally;
Outside half die 8 internal diameter trench regions, within the scope of elastic deformation limit, even increased tubing rebound value D
m, adopt intensity to equal material flow stress (σ
1=σ
0.2).This just guarantees the freely closure of half module on pipe, and after groove is shaped, caliber does not have to change substantially.
The working surface of half described die 8 will have very high roughness Ra=0.63～2.5 μ m, and this half die 8 is in two directions centered by pin, and on a die joint, one and half are molded into a pin, and another half module has corresponding aperture.
Between described elastomer 0 and support bar 9, be provided with support pad.
Described elastomer 0 and compress gasket 20 are 0.5～1mm with pipe internal diameter minimum clearance.This little gap has guaranteed the high wear-out life of elastomer 0, and band pad lining is freely inserted in tubing 3 to be processed.
Described elastomer 0 is made (forming pressure≤30～40MPa) by thick 30～40mm polyurethane or rubber slab.
The outside of half described die 8 is further provided with guide pad 12 and leads for double die 8, under the effect of two horizontal air cylinders 7 of upper and lower two upright cylinders 6 and left and right, press to tubing 3 to be processed, by means of the cone boss (not shown) on taper bush 10 and support bar 9, under two upright cylinder 6 effects, keep operating pressure state.
As shown in Figure 2, described radial positioning mechanism 2 is provided with supplemental support pad 13 in the outside that can divide die mechanism 5.
Described axial push-pull builder 1 comprises: stay pipe 14, piston rod 15 and hydraulic cylinder 16, wherein: a side end of piston rod 15 is connected with hydraulic cylinder piston 16, and stay pipe 14 is socketed on the outside of piston rod 15.
As shown in Figure 2, described radial compaction mechanism 2 inside are further provided with stop 17, this stop 17 comprises: run through successively the nut 18, cutting taper sheath 19 and the compress gasket 20 that are arranged at piston rod 15 ends, wherein: the end face of compress gasket 20 is realized face with cutting taper sheath 19 with the elastomer 0 in radial positioning mechanism 2 respectively with bottom surface and contacted, and the side of compress gasket 20 is realized face with the inwall of tubing 3 to be processed and contacted.
As shown in Figure 4, be provided with feed cover 21 between described compress gasket 20 and described elastomer 0, the axial both ends of the surface of this feed cover 21 contact with supplying 26, base pad with compress gasket 20 respectively, and radial surface is realized tight face with the inwall of tubing 3 to be processed and contacted.By this feed cover 21, can further provide axial push-pull to be shaped and supply with the needed frictional force of pipe feeding.
As shown in Figure 5, being provided with of described piston rod 15 forced for base device 22, and this pressure contacts with the end of tubing 3 to be processed for a side of base device 22.
Described pressure comprises for base device 22: run through be successively arranged on piston rod 15 for base internal gasket 23, compresses elastomeric 24, for the outer pad 25 of base and cutting pad 26, wherein: the both sides for base internal gasket 23 fit tightly with the end of shaping sleeve 24 and tubing to be processed 3 respectively.
By this pressure, for base device, can realize and the axial push-pull required pipe that provides that is shaped is provided in the reliable situation of tubing intensity supplies with required frictional force.
The present embodiment relates to a kind of Large Diameter Pipeline titanium bellows manufacture method, comprises the following steps:
Step 1) groove is shaped: in two and half dies 8 of opening, insert tubing 3 to be processed, then put elastomer 0 in pipe; Step 2) uprightly cylinder 6 is 0.5MPa compressed air and drives half die 8, half dies 8 that led by guide pad 12 to press to piston rod 15 under horizontal air cylinder 7 drives from external pipeline acquisition pressure, closes half die.
Step 3) realizes pressure-loaded to hydraulic cylinder 16 oil amounts: hydraulic cylinder 16 obtains pressure 20MPa hydraulic oil from Hydraulic Station, and the power that hydraulic cylinder 16 is applied on piston rod 15 is no more than 1000kN; Under the pressure of hydraulic oil, piston rod 15 moves right and compression gasket, piston stroke 350mm, and other nuts are compressed by stay pipe 14 and hydraulic cylinder 16, compression gasket and piston rod 15, lining and nut.By means of the cone boss on taper bush 10 and support die, under two upright cylinder actions, keep operating pressure state 1～2 minute; Under the resilient force of elastomer 0, swelling pressure tubing 3 to be processed also forces its distortion of inner chamber at mould.
Step 4) is under hydraulic cylinder 16 pressure release backhaul conditions, and piston rod 15 carries out reseting movement, and elastomer 0 also returns to sleeve original state; By the backhaul chamber to upright cylinder 6 and horizontal air cylinder 7, supply with compressed air half die 8 is opened, and leave the tubing to be processed 3 with shaping groove; For the next groove of tubing 3 to be processed that is shaped, stop 17 is axially moved on to the processing of next pending position repeating step 1 until complete the whole grooves on tubing 3 to be processed.
The present embodiment relates to a kind of Large Diameter Pipeline titanium bellows preparing based on said method, and its diameter is 150～400mm, and wall thickness is less than or equal to 3mm.
The Large Diameter Pipeline titanium bellows that the present embodiment prepares is titanium tube TA1 annealed state material, caliber 175～325mm, and wall thickness 2.5mm, meets GB/T3624-1995 national standard.
Described Large Diameter Pipeline titanium bellows, be shaped further factory length of the groove by two end face bend pipe reaches the bellows of 4000mm; As add long draw and can further manufacture longer bellows.
As shown in Figure 4, be distortion top area distortion distribution experimental result, visible with reference to the accompanying drawings:
Tangential deformation
wherein: Δ Di is that caliber is at research point increment; D is tubing groove external diameter to be processed.
Radial deformation (material thickens)
wherein: s is pipe thickness; Δ s
ifor research point material thickness variation, this variation is with special-purpose spherical miking is housed, to eliminate flute surfaces Curvature Effect.
By constancy of volume, incompressibility, by tangential and radial deformation, determine warp-wise (meridian direction) distortion: ε
1+ ε
2+ ε
3=0, ε thus
2=-(ε
1+ ε
3), obvious by Fig. 5, for 175 calibers, there is relatively large groove height, the tangential stretcher strain of groove top area almost reaches 15%, approaches tubing titanium tube TA1 annealed state (GB/T3624-1995) ultimate elongation value, and material attenuation rate reaches 10%.Warp-wise compression is little value (limiting value 5%).Be out of shape the more multitube base supply of instantaneous needs, for this reason, adopt blank to be provided by sleeve and flexible member friction brute force.
By constancy of volume, incompressibility, obtained, in order to reduce the attenuation of trench region material, must increase warp-wise compressive strain, depend at groove shaped region and apply more energetically to tubing to be processed.Reaching ε
2=-ε
1under condition, material attenuation ε
3equal zero.
Claims (10)
1. a Large Diameter Pipeline titanium corrugated pipe manufacturing equipment, it is characterized in that, comprise: axial push-pull builder and radial positioning mechanism, wherein: tubing to be processed is arranged in radial positioning mechanism and is connected with axial push-pull builder, and axial push-pull builder and radial positioning mechanism inside are provided with compressed air path;
Described radial compaction mechanism comprises: be arranged at the divided die mechanism of tubing to be processed outside and upright cylinder and the horizontal air cylinder being attached thereto, by upright cylinder and horizontal air cylinder compressed air charge and discharge realization can divide die mechanism treat processing tubing location;
Described axial push-pull builder comprises: stay pipe, piston rod and hydraulic cylinder, wherein: a side end of piston rod is connected with hydraulic cylinder, and stay pipe is socketed on the outside of piston rod.
2. Large Diameter Pipeline titanium corrugated pipe manufacturing equipment according to claim 1; it is characterized in that; described divided die mechanism comprises: be arranged at the elastomer of tubing to be processed inside, half die that lays respectively at tubing to be processed outside and support bar and the taper bush that is set in turn in half die outside, elastomeric inner surface contacts with piston rod.
3. Large Diameter Pipeline titanium corrugated pipe manufacturing equipment according to claim 2, it is characterized in that, between described elastomer and piston rod, be provided with the middle steel sleeve of tubular structure, half of the diameter of this centre steel sleeve is the more than 2～3 times of the shaping groove degree of depth, to guarantee that pad has enough wear-out lifes.
4. Large Diameter Pipeline titanium corrugated pipe manufacturing equipment according to claim 2, is characterized in that, the internal diameter of half described die is determined in the following manner:
wherein: D is tube outer diameter to be processed; σ
1for correspondence tubing tangential deformation to be processed tangential stress value; E is tubing elastic modelling quantity;
Under tubing groove molding condition to be processed, when tangential deformation has maximum, for can adopting trench region tangential stress, Practical Calculation equals strength degree, i.e. σ
1=σ
b, the error of calculation is no more than 10% conventionally;
Outside half die internal diameter trench region, within the scope of elastic deformation limit, even increased tubing rebound value D
m, adopt intensity to equal material flow stress, i.e. σ
1=σ
0.2.
5. Large Diameter Pipeline titanium corrugated pipe manufacturing equipment according to claim 2, it is characterized in that, roughness Ra=0.63～2.5 μ the m of the working surface of half described die, this half die is in two directions centered by pin, on a die joint, one and half are molded into a pin, and another half module has corresponding aperture.
6. according to the Large Diameter Pipeline titanium corrugated pipe manufacturing equipment described in claim 2 or 4 or 5, it is characterized in that, the outside of half described die is provided with guide pad and leads for double die, under the effect of upper and lower two upright cylinders and two horizontal air cylinders in left and right, press to tubing to be processed, by means of the cone boss on taper bush and support bar, under two upright cylinder actions, keep operating pressure state.
7. Large Diameter Pipeline titanium corrugated pipe manufacturing equipment according to claim 1, it is characterized in that, the in-house stop that is provided with of described radial compaction, this stop comprises: run through successively the nut, cutting taper sheath and the compress gasket that are arranged at piston-rod end, wherein: the end face of compress gasket is realized face with cutting taper sheath with the elastomer in radial positioning mechanism respectively with bottom surface and contacted, the side of compress gasket is realized face with the inwall of tubing to be processed and is contacted.
8. Large Diameter Pipeline titanium corrugated pipe manufacturing equipment according to claim 7, it is characterized in that, between described compress gasket and described elastomer, be provided with feed cover, the axial both ends of the surface of this feed cover contact with elastomer surface with compress gasket respectively, and radial surface is realized face with the inwall of tubing to be processed and contacted; By this feed cover, can further provide the axial push-pull needed frictional force that is shaped.
9. Large Diameter Pipeline titanium corrugated pipe manufacturing equipment according to claim 1, is characterized in that, being provided with of described piston rod forced for base device, and this pressure contacts with the end of tubing to be processed for a side of base device; Described pressure comprises for base device: run through be successively arranged on piston rod for base internal gasket, shaping sleeve, for the outer pad of base and cutting pad, wherein: the both sides for base internal gasket fit tightly with the end of shaping sleeve and tubing to be processed respectively; By this pressure, for base device, can realize and in the reliable situation of tubing intensity, increase considerably the axial push-pull needed pulling force that is shaped.
10. the Large Diameter Pipeline titanium bellows preparing according to the equipment described in above-mentioned arbitrary claim, is characterized in that, its diameter is 150～400mm, and wall thickness is less than or equal to 3mm.
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|---|---|---|---|
| CN201320587745.3U CN203484467U (en) | 2013-09-16 | 2013-09-16 | Manufacturing equipment for large-pipe-diameter titanium corrugated pipe and corrugated pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320587745.3U CN203484467U (en) | 2013-09-16 | 2013-09-16 | Manufacturing equipment for large-pipe-diameter titanium corrugated pipe and corrugated pipe |
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|---|---|
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ID=50255326
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521576A (en) * | 2013-09-16 | 2014-01-22 | 上海桦厦实业有限公司 | Large-diameter titanium corrugated pipe manufacturing device and manufacturing method thereof |
| CN111715752A (en) * | 2020-06-28 | 2020-09-29 | 刘龙英 | Corrugated pipe roll forming machine |
-
2013
- 2013-09-16 CN CN201320587745.3U patent/CN203484467U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521576A (en) * | 2013-09-16 | 2014-01-22 | 上海桦厦实业有限公司 | Large-diameter titanium corrugated pipe manufacturing device and manufacturing method thereof |
| CN111715752A (en) * | 2020-06-28 | 2020-09-29 | 刘龙英 | Corrugated pipe roll forming machine |
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