CN103974788A - Method for manufacturing seamless pipe - Google Patents
Method for manufacturing seamless pipe Download PDFInfo
- Publication number
- CN103974788A CN103974788A CN201380004151.8A CN201380004151A CN103974788A CN 103974788 A CN103974788 A CN 103974788A CN 201380004151 A CN201380004151 A CN 201380004151A CN 103974788 A CN103974788 A CN 103974788A
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- Prior art keywords
- hollow
- billet
- push
- tubulation
- bench
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/06—Making machine elements axles or shafts
- B21K1/063—Making machine elements axles or shafts hollow
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
- B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles by means of mandrels
- B21C1/26—Push-bench drawing
Abstract
A method for manufacturing seamless pipe that includes: a step wherein a mandrel is inserted into a hollow billet for processing, by means of casting, into an element pipe having a prescribed diameter and thickness; a step wherein one end of the element pipe is drawn; and a step wherein a metal core is inserted into the element pipe one end of which has been drawn, and a push bench is used to perform punching. By means of this method it is possible to manufacture seamless pipes with a wide range of manufacturability (large-diameter, thick-walled) and with high dimensional precision, and particularly with high wall-thickness precision.
Description
Technical field
The present invention relates to a kind of manufacture method of seamless steel pipe that can the seamless steel pipe that manufacturing dimension precision is higher in wider size range.In particular to a kind of utilizing plug to apply the manufacture method of the seamless steel pipe of push-bench tubulation method in forging the hollow billet that the manufacture of tubulation method forms.
Background technology
If there is no specified otherwise, described in the term in this description is defined as follows.
" hollow steel billet ": the steel billet providing to step 1 (plug forges tubulation operation) described in this description is provided.For in advance steel ingot perforation is processed as to the steel billet of hollow shape under warmed-up condition.
" hollow billet ": the pipe providing to step 2 (constriction operation) described in this description is provided.For the pipe being formed by hollow steel billet manufacture in step 1.
" hollow forging ": refer to subtract to push-bench the pipe that wall operation provides described in this description.For utilizing the smooth operation of push-bench to make the smooth pipe in interior outside.
" large footpath ": the external diameter of vial is more than 1000mm.
" dimensional accuracy ": the absolute value of the difference of the actual size after the external diameter of vial and the target size of wall thickness and processing.
Large-diameter pipe, the such as large footpath reheated steam pipe that uses in steam power plant etc. use spiral steel pipe conventionally.In recent years, the vapour pressure of the large footpath reheated steam pipe using in steam power plant is set the performance that waits, large-diameter pipe is required that rises and is raise gradually, thereby needs gradually the seamless steel pipe in high-quality and large footpath.
In the past, as the forge hot manufacture method of the seamless steel pipe in large footpath, have application plug and forged the example of tubulation method.
As described in patent documentation 1, it is following method that plug forges tubulation method: enter plug to hollow steel billet interpolation, by carrying out flat-die forging under the condition in heating, the wall thickness of hollow steel billet is reduced gradually.
The advantage that plug forges tubulation method is: forge and heat by repeating, and the free degree that can tubulation size is larger.That is to say, can manufacture the seamless steel pipe in heavy wall and large footpath.
On the other hand, the shortcoming that plug forges tubulation method is: be shaped owing to utilizing to forge, therefore dimensional accuracy is lower.Therefore, in the finishing step after hot tubulation operation, the cutting output of steel tube surface is larger, and yield rate is lower.
Patent documentation 1: Japanese Patent Publication 7-22802 communique
Patent documentation 2: Japanese kokai publication sho 56-128611 communique
Summary of the invention
the problem that invention will solve
The object of the present invention is to provide a kind of manufacture method of the seamless steel pipe that can take into account higher dimensional accuracy, particularly good wall thickness dimension precision and the wider scope manufactured (large footpath, heavy wall).
for the scheme of dealing with problems
The inventor is conceived to a kind of push-bench tubulation method that can manufacture the seamless steel pipe that wall thickness dimension precision is higher.As shown in patent documentation 2, push-bench tubulation method is following method: insert push rod to having in the steel of hollow shape of bottom, by using punch die to carry out punch process, wall thickness is reduced.The advantage of push-bench tubulation method is: owing to using external diameter and the internal diameter Limit Tool of punch die and push rod etc., therefore dimensional accuracy is higher.Therefore, in finishing step, tube-surface cutting output is less, and yield rate is higher.
If can apply flexibly the advantage of plug forging tubulation method and these two tubulation methods of push-bench tubulation method, can be with the seamless steel pipe of higher dimensional accuracy manufacturing dimension wider range.But, in push-bench tubulation method, use the raw material steel billet of the hollow shape with bottom.Therefore the seamless steel pipe that, utilizes the manufacture of plug forging tubulation method to form cannot directly be applied to push-bench tubulation method as raw material steel billet.Its reason does not also lie in the hollow steel billet end of with, but because cannot utilize push rod punching press.
So the inventor has worked out the method that the seamless steel pipe that utilizes plug forging tubulation method to produce is applied to push-bench tubulation method.Draw from the result of a large amount of repetition tests: if so that utilize plug to forge the replacement portion that the external diameter of end of a side of the seamless steel pipe that tubulation method produces and mode that internal diameter diminishes are carried out constriction and bottom is set, can combine two pipe-making methods.
The present invention makes in view of the result of this research, and its aim is:
The manufacture method of seamless steel pipe is characterised in that and comprises the following steps:
(1) enter plug and utilize and forge the step that this hollow steel billet is processed as to the diameter of regulation and the hollow billet of thickness to hollow steel billet interpolation;
(2) constriction processing carried out in one end of above-mentioned hollow billet and make the step of external diameter and internal diameter undergauge; And
(3) in the above-mentioned hollow billet after being processed by constriction to one end, insert push rod and use push-bench to carry out the step of punch process.
the effect of invention
The effect of the manufacture method of seamless steel pipe of the present invention is: after having used plug forging tubulation method, use push-bench tubulation method, therefore, can be with the seamless steel pipe of higher dimensional accuracy, particularly higher wall thickness dimension accurate manufacturing technique size range wider (large footpath, heavy wall).
Brief description of the drawings
Fig. 1 is the longitudinal section of the hollow billet after constriction processing.
Fig. 2 is the side view of the head portion of the push rod that uses in push-bench tubulation operation.
Fig. 3 is the structure chart of hollow billet, push rod and punch die in push-bench tubulation operation.
Fig. 4 is the figure of the scope manufactured of the seamless steel pipe of push-bench tubulation method more in the past and manufacture method of the present invention.
Detailed description of the invention
Manufacture method comprises step 1 (plug forges tubulation operation), step 2 (constriction operation), step 3 (push-bench tubulation operation).Each step is described.
step 1 (plug forges tubulation operation)
In step 1, manufacture hollow billet.Order is as described below:
(1) make under the state of top tapering instrument rotation, this instrument pressed to the upper surface of the steel ingot that length direction is made as to vertical configures, under the condition of heating by steel ingot perforation and make hollow steel billet;
(2) configure hollow steel billet in the mode that length direction is made as to level, under the state that this hollow steel billet is rotated, under the condition of heating, plug is pressed to the inner surface of hollow steel billet, thereby subtracted wall;
(3) by above-mentioned (2) thus operation repeat one or many be processed into the external diameter of regulation and the hollow billet of wall thickness.
Forge in tubulation operation at plug, expect that the forge hot of hollow steel billet is carried out in the temperature range of 900 DEG C～1250 DEG C.
step 2 (constriction operation)
Fig. 1 is the longitudinal section of the hollow billet after constriction processing.In step 2, the hollow billet 1 producing in step 1 is rotated, constriction processing is carried out in the end of one side simultaneously, thereby reduce its external diameter and internal diameter.
Part after being processed by constriction is made up of top ends 1a and the reducing diameter part 1b of the tip side of hollow billet 1.Reducing diameter part 1b is between top ends 1a and the main part do not processed by constriction.Top ends 1a has constant external diameter and wall thickness.It is less that the external diameter of reducing diameter part 1b and internal diameter more approach top.
In step 3 and the part that constriction processes afterwards generation distortion, can suitably again carry out this constriction processing.Constriction processing not only can be used punch process, can also use the end of a side of hollow billet 1 is utilized to method that hammer beats, utilizes forging machine etc. to be rotated the method for forging.
the shape of the part after constriction processing
Fig. 2 is the side view of the head portion of the push rod that uses in push-bench tubulation operation.Push rod 2 is made up of columniform main part 2a and the reducing diameter part 2b that is located at the truncated cone-shaped on the top of main part 2a.It is less that the diameter of reducing diameter part 2b more approaches the top of push rod 2.Conventionally, reducing diameter part 2b is formed as conical in shape.
For the part after being processed by constriction in step 2 of hollow billet 1, be made as B (mm) the constriction of hollow billet being processed to distolateral internal diameter, the top end diameter of the push rod using in push-bench tubulation operation is made as D (mm), expects to meet following formula (1).This is during for punching press in step 3 (push-bench tubulation operation), reduces the possibility that push rod 2 breaks through top ends 1a and the reducing diameter part 1b of hollow billet 1.In the situation that meeting formula (1), also comprise the complete totally enclosed situation of part after being processed by constriction.
B＜D/4…(1)
step 3 (push-bench tubulation operation)
Fig. 3 is the structure chart of hollow billet, push rod and punch die in push-bench tubulation operation.Punch die 3 can connect multiple, also can be one.Conventionally, as punch die 3, can use taper punch die, it is 10 °～20 ° that punch die half-angle α is suitable for, and punch die width W is suitable for as 150mm～200mm.
In step 3, the interior insertion push rod 2 of hollow billet 1 after being processed by constriction to one end, uses push-bench to carry out punch process.Expect step 3 to be divided into smooth operation and to subtract wall operation (to be also called below " the smooth operation of push-bench " and " push-bench subtracts wall operation ".)。
smooth operation
In smooth operation, to by the interior insertion push rod 2 of hollow billet 1 after the end constriction processing of a side, in punch die 3, carry out drop stamping, thereby make the shape leveling of surfaces externally and internally.In order to utilize above-mentioned taper punch die to make the shape of surfaces externally and internally of hollow billet 1 smooth, by gently depressing to apply punch process, obtain the hollow forging 1 providing to subtracting wall operation.
In smooth operation, utilize punch die 3 to reduce the external diameter on the length direction of hollow billet 1, the variation of wall thickness.Its reason is, for example, if in the time utilizing taper punch die to carry out punching press to hollow billet 1 and have larger concavo-convexly at outer surface, this concavo-convex and interference of taper punch die, maybe cannot carry out punching press and be difficult to carry out punching press.
Degree of finish in smooth operation is desirably in 3%～7% left and right.
The temperature of the portion that is stamping (part the part after constriction processing) of the hollow billet 1 in smooth operation is expected to be made as 900 DEG C～1250 DEG C.This is because can reduce deformation drag, and easily processes.
Because the part after constriction processing is the part of being pressed by push rod 2, therefore, for distortion being suppressed to Min. when the punch process, expect to lower the temperature by injection water.In order to utilize push rod 2 reliably hollow billet 1 to be carried out to punching press, the temperature of the part after constriction processing expects to be below 500 DEG C.Lower limit temperature is expected to be made as 400 DEG C.This be because, for example, also have as 9%Cr steel can be because of martensite phase transformation in the time being cooled to low temperature time the thermal stress steel grade that may split.
subtract wall operation
Subtracting in wall operation, provide and in above-mentioned smooth operation, utilize the hollow forging 1 obtaining based on the punch process of gently depressing.In wall operation, also use push rod 2 and the punch die 3 that structure is identical with above-mentioned Fig. 2 subtracting.The selected punch die that can apply to hollow forging 1 degree of finish of regulation of punch die 3 using.
Subtracting wall operation is made up of following order:
(1) use the less punch die 3 of internal diameter, to utilizing smooth operation to make the hollow forging of the shape leveling of surfaces externally and internally apply the degree of finish of regulation and carry out drop stamping and subtract wall.
(2) by carrying out once or the operation of above-mentioned (1) repeatedly, can manufacture the seamless steel pipe that wall thickness dimension precision is good.Particularly, can make the difference of the wall thickness dimension of itself and target be formed as 10mm following and do not rely on the wall thickness dimension after being stamping.
Subtracting in wall operation, also in order to reduce deformation drag, easily processing, expects the main part being stamping to be made as 900 DEG C～1250 DEG C.On the other hand, in order to utilize reliably push rod 2 to carry out punching press to hollow forging 1, expect to be formed as below 500 DEG C to the part injection water after constriction processing etc.Lower limit temperature is expected to be made as 400 DEG C.
Also can after the operation of above-mentioned step 1～step 3, finishing step be set.Finishing step is made up of following order:
(1) part after the constriction processing of the seamless steel pipe of manufacturing in step 3 is cut off.
(2) as required, to being cut off to the seamless steel pipe forming, the part after constriction processing applies heat treatment.
(3) as the fine finishining of the seamless steel pipe obtaining, carry out machining or attrition process by the inner surface to steel pipe and outer surface, and be finish-machined to surface configuration and the size of regulation.
preferred steel grade
As preferred steel grade in above-mentioned manufacture method, following three kinds can be listed.
(1) have in quality % contain that C:0.3% is following, Si:1% following, Mn:0.1%～2% and below N:0.02%, and there is the carbon steel of the chemical composition that remainder is made up of Fe and impurity
(2) have in quality % contain that C:0.15% is following, Si:1% following, Mn:0.1%～2%, Cr:0.5%～3.0%, Ni:0.5% are following, Mo:0.1%～3.0%, W:0～2%, Cu:0.1% are following and N:0.002%～0.030%, and have the low-alloy steel of the chemical composition that remainder is made up of Fe and impurity
(3) have in quality % contain that C:0.15% is following, Si:1% following, Mn:0.1%～2%, Cr:8.0%～12.5%, Ni:1.0% are following, Mo:0.1%～3.0%, W:0～4%, Cu:0～1.5% and N:0.01%～0.10%, and have the high Cr jessop of the chemical composition that remainder is made up of Fe and impurity
embodiment
Below, according to embodiment, explanation can be manufactured the situation of the seamless steel pipe that wall thickness dimension precision is good, and can expand the situation of the scope manufactured of seamless steel pipe.
embodiment 1
In embodiment 1, the example of the scope manufactured that explanation can expanded outer diameter.
1. the tubulation flow process in each operation
Plug forges tubulation operation: in the hollow steel billet (weight is 13850kg) forming to the high Cr jessop melting by above-mentioned, insert plug, utilize plug to forge tubulation method, producing external diameter is that 1250mm, internal diameter are that 1090mm, wall thickness are the hollow billet that 80mm and length are 6000mm.
Constriction operation: constriction processing is carried out in the one end to the hollow billet obtaining, and makes external diameter and internal diameter undergauge.It is 200mm that the constriction of hollow billet is now processed distolateral internal diameter B.
The smooth operation of push-bench: insert the push rod that external diameter is 1060mm in the hollow billet after being processed by constriction to one end, utilize push-bench, the punch die that use internal diameter is 1240mm is gently depressed and produced the smooth hollow forging of surfaces externally and internally.The top end diameter D of push rod is now 950mm, therefore can meet above-mentioned formula (1).
Push-bench subtracts wall operation: utilize push-bench, to use external diameter be 1060mm push rod and internal diameter, for the punch die that 1210mm and internal diameter are 1190mm, carries out punch process to the hollow forging obtaining, and produces seamless steel pipe.
Finishing step: the external diameter of the seamless steel pipe producing is that 1190mm, internal diameter are that 1060mm, wall thickness are that 65mm and length are 7600mm.End after being processed by constriction of this seamless steel pipe is cut off to 300mm length, applying after heat treatment, surfaces externally and internally is carried out to machining.
2. the comparison of wall thickness dimension precision
For the seamless steel pipe producing in embodiment 1, the dimensional accuracy of its wall thickness be less than 10mm and with external diameter be that 1190mm, internal diameter are that 1060mm and wall thickness are that the so large footpath of 65mm is irrelevant.So to be finish-machined to external diameter be that 1170mm, internal diameter are that 1080mm and wall thickness are 45mm by surfaces externally and internally being carried out to machining.
,, in embodiment 1, for outer surface and inner surface, the required cutting output of fine finishining all only has 10mm.
As the comparative example of embodiment 1, directly utilize plug to forge external diameter that tubulation method produces and exceeded 20mm for the wall thickness dimension precision of 1090mm and the wall thickness hollow billet that is 80mm for 1250mm, internal diameter.
As mentioned above, for outer surface and inner surface, the cutting output in embodiment 1 all only has 10mm, on the other hand, owing to can supposing that fine finishining cutting output required in comparative example all exceedes 25mm in outer surface and inner surface, therefore can specify embodiment 1 and play significant effect.
embodiment 2
In embodiment 2, explanation can expand the example of the scope manufactured of wall thickness.
1. the tubulation flow process in each operation
Plug forges tubulation operation: in the hollow steel billet (weight is 25600kg) forming to the high Cr jessop melting by above-mentioned, insert plug, utilize plug to forge tubulation method, producing external diameter is that 1050mm, internal diameter are that 640mm, wall thickness are the hollow billet that 205mm and length are 6000mm.
Constriction operation: constriction processing is carried out in the one end to the hollow billet obtaining, and makes external diameter and internal diameter undergauge.It is 100mm that the constriction of hollow billet is now processed distolateral internal diameter B.
The smooth operation of push-bench: insert the push rod that external diameter is 610mm in the hollow billet after being processed by constriction to one end, utilize push-bench, the punch die that use internal diameter is 1040mm is gently depressed and produced the smooth hollow forging of surfaces externally and internally.The top end diameter D of push rod is now 500mm, therefore can meet above-mentioned formula (1).
Push-bench subtracts wall operation: utilize push-bench, the punch die that to use external diameter be 610mm push rod and internal diameter is 990mm for 1010mm and internal diameter carries out punch process to the hollow forging obtaining, and produces seamless steel pipe.
Finishing step: the external diameter of the seamless steel pipe producing is that 990mm, internal diameter are that 610mm, wall thickness are that 190mm and length are 6800mm.End after being processed by constriction of this seamless steel pipe is cut off to 300mm length, applying after heat treatment, surfaces externally and internally is carried out to machining.
2. the comparison of wall thickness dimension precision
For the seamless steel pipe producing in embodiment 2, the dimensional accuracy of its wall thickness be less than 10mm and with external diameter be that 990mm, internal diameter are that 610mm and wall thickness are that the such heavy wall of 190mm is irrelevant.So to be finish-machined to external diameter be that 970mm, internal diameter are that 630mm and wall thickness are 170mm by surfaces externally and internally being carried out to machining.
,, in embodiment 2, the required cutting output of fine finishining all only has 10mm in outer surface and inner surface.
As the comparative example of embodiment 2, about directly utilizing plug to forge the hollow billet that external diameter that tubulation method produces is 205mm for 1050mm, internal diameter for 640mm and wall thickness, in the time of wall-thickness measurement dimensional accuracy, identical with embodiment 1, exceed 20mm.
Therefore, in outer surface and inner surface, all only have 10mm to compare with cutting output in embodiment 2, owing to can supposing that fine finishining cutting output required in comparative example all exceedes 25mm in outer surface and inner surface, therefore can specify embodiment 2 and play significant effect.
Fig. 4 is the figure of the scope manufactured of the seamless steel pipe of push-bench tubulation method more in the past and embodiment 1 or embodiment 2.The prerequisite that can manufacture scope is that wall thickness dimension precision must be below 10mm.
In Fig. 4, institute clearly, in the time only utilizing push-bench tubulation method (comparative example), can be below 10mm, to manufacture external diameter to be the seamless steel pipe that 850mm or wall thickness are 150mm to the maximum to the maximum in wall thickness dimension precision.With respect to this, in embodiment 1 or embodiment 2, can be to external diameter the seamless steel pipe that 1200mm or wall thickness are 170mm to the maximum to the maximum by manufacturing expanded range.
utilizability in industry
According to the manufacture method of seamless steel pipe of the present invention, can be with the seamless steel pipe of higher dimensional accuracy, particularly higher wall thickness dimension accurate manufacturing technique size range wider (large footpath, heavy wall).
description of reference numerals
1, hollow billet, hollow forging; 1a, top ends; 1b, reducing diameter part; 2, push rod; 2a, main part; 2b, reducing diameter part; 3, punch die.
Claims (1)
1. a manufacture method for seamless steel pipe, is characterized in that,
This manufacture method comprises the following steps:
Enter plug and by forging, this hollow steel billet is processed as to the step of the diameter of regulation and the hollow billet of thickness to hollow steel billet interpolation;
One end of above-mentioned hollow billet is carried out constriction processing and made the step of external diameter and internal diameter undergauge; And
In above-mentioned hollow billet after being processed by from constriction to one end, insert push rod and use push-bench to carry out the step of punch process.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012110569 | 2012-05-14 | ||
| JP2012-110569 | 2012-05-14 | ||
| PCT/JP2013/000596 WO2013171935A1 (en) | 2012-05-14 | 2013-02-04 | Method for manufacturing seamless pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103974788A true CN103974788A (en) | 2014-08-06 |
| CN103974788B CN103974788B (en) | 2015-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380004151.8A Active CN103974788B (en) | 2012-05-14 | 2013-02-04 | The manufacture method of seamless steel pipe |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2786814B1 (en) |
| JP (1) | JP5387797B1 (en) |
| CN (1) | CN103974788B (en) |
| ES (1) | ES2645985T3 (en) |
| WO (1) | WO2013171935A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111941006A (en) * | 2020-08-11 | 2020-11-17 | 宁波驶泰精密机械有限公司 | Washing machine shaft waste treatment device and waste reprocessing technology |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201700049072A1 (en) * | 2017-05-05 | 2018-11-05 | Giorgio Violi | MACHINE FOR DRAWING OF TUBES, IN PARTICULAR FOR GOLDSMITH AND SILVERWARE |
| FR3077016B1 (en) | 2018-01-22 | 2021-10-01 | Aubert & Duval Sa | METHOD OF MANUFACTURING A HOLLOW PART FROM A METAL MATERIAL AND USE OF THIS PROCESS TO MANUFACTURE A ROD OR A LANDING GEAR ROD |
| CN115041536A (en) * | 2022-08-16 | 2022-09-13 | 中北大学 | Extrusion forming die and method for conical cabin with end frame |
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- 2013-02-04 ES ES13791398.4T patent/ES2645985T3/en active Active
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- 2013-02-04 CN CN201380004151.8A patent/CN103974788B/en active Active
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- 2013-02-04 EP EP13791398.4A patent/EP2786814B1/en active Active
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| JPS611413A (en) * | 1984-06-15 | 1986-01-07 | Nippon Kokan Kk <Nkk> | Manufacture of thick steel pipe having large diameter |
| CN1149513A (en) * | 1996-10-04 | 1997-05-14 | 西北有色金属研究院 | Working method and device for external spiral tendon metal tube |
| CN1744956A (en) * | 2003-04-11 | 2006-03-08 | 杰富意钢铁株式会社 | Method and device for manufacturing tube with high dimensional accuracy |
| CN101773945A (en) * | 2009-01-13 | 2010-07-14 | 中兴能源装备股份有限公司 | Pipeline diameter diminishing device |
| CN101693260A (en) * | 2009-10-09 | 2010-04-14 | 安徽工业大学 | Method for drawing high-precision aluminum pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111941006A (en) * | 2020-08-11 | 2020-11-17 | 宁波驶泰精密机械有限公司 | Washing machine shaft waste treatment device and waste reprocessing technology |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5387797B1 (en) | 2014-01-15 |
| EP2786814B1 (en) | 2017-08-02 |
| WO2013171935A1 (en) | 2013-11-21 |
| EP2786814A4 (en) | 2015-08-12 |
| EP2786814A1 (en) | 2014-10-08 |
| CN103974788B (en) | 2015-08-26 |
| JPWO2013171935A1 (en) | 2016-01-07 |
| ES2645985T3 (en) | 2017-12-11 |
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