CN103240293A - Seamless aluminum-alloy pipe with variable pipe wall thickness and production method thereof - Google Patents
Seamless aluminum-alloy pipe with variable pipe wall thickness and production method thereof Download PDFInfo
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- CN103240293A CN103240293A CN2013101753070A CN201310175307A CN103240293A CN 103240293 A CN103240293 A CN 103240293A CN 2013101753070 A CN2013101753070 A CN 2013101753070A CN 201310175307 A CN201310175307 A CN 201310175307A CN 103240293 A CN103240293 A CN 103240293A
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Abstract
The invention discloses a seamless aluminum-alloy pipe with variable pipe wall thickness and a production method thereof. The production method comprises the steps of preheating a mould, carrying out aluminum-alloy ingot preheating and extruding: firstly, gradually leading the front end of an extrusion needle into a work tape of an extrusion die, beginning extrusion by utilizing an extrusion shaft control system, and manufacturing an aluminum-alloy ingot subjected to preheating into a pipe body with a thick wall through the front end of the extrusion needle under the effect of extrusion force; then, leading the maximum cross section end of the extrusion needle into the work tape of the extrusion die, and stopping the work of the extrusion needle to form a pipe body with a thin wall; and finally, after the length of the pipe body with the thin wall achieves the design requirement, drawing back the extrusion needle to form the pipe body with the thick wall, and advancing and drawing back the extrusion needle to form a seamless aluminum-alloy pipe with variable pipe wall thickness under the effect of extrusion force. The seamless aluminum-alloy pipe with variable pipe wall thickness produced with the production method can meet the requirements on the fields of machine manufacturing, petroleum, energy, oceans and the like.
Description
Technical field
The invention belongs to the preparation method of metal pipe material, be specifically related to the changeable seamless Al-alloy pipe of a kind of pipe thickness and production method thereof.
Background technology
Extrusion casint forms seamless tubular goods at a new material processing technique of the invention seventies in 20th century, it is that liquid metal is solidified and moulding under higher mechanical pressure, obtain the process of seamless tubular goods, the mould of this processing technology adopts one-level extruding pin, the section that pushes the seamless tubular goods of pin formation by this one-level is invariable, be that girth, wall thickness are consistent, as Fig. 1, Fig. 2 and shown in Figure 3.Need adopt the changeable tubing of change section at special dimensions such as machine-building, oil, the energy, oceans, the design of can optimizing structure of this tubing, make the more firm of their connections, the pipe thickness of this tubing need have various deformation, as the thick intermediate thin in two ends, the thick middle two ends are thin and thickness is the change section tubing of complex forms such as cycle variation.The existing section pipes processing method that becomes can only process and becomes section and be section tubing such as Fig. 3 of phase change and become section and be tubing that gradual change changes as shown in Figure 4, can't process the changeable tubing of pipe thickness.Therefore can not give full play to the superiority that becomes section tubing, limit the range of application of change section tubing, thereby can not be suitable for each industrial circle to becoming the demand of section tubing.
Summary of the invention
One of purpose of the present invention is single in order to overcome the section structure that has tubing now, the production method of the changeable seamless Al-alloy pipe of a kind of pipe thickness is provided, can process the changeable seamless Al-alloy pipe of pipe thickness by this method, and processing method is simple, working (machining) efficiency is high.
Two of purpose of the present invention provides a kind of pipe thickness changeable seamless Al-alloy pipe, and the tube wall thickness of this seamless Al-alloy pipe is changeable, thereby has enlarged the range of application of seamless Al-alloy pipe.
One of purpose of the present invention is achieved through the following technical solutions:
The production method of the seamless Al-alloy pipe that a kind of pipe thickness is changeable comprises mould and die preheating, aluminium alloy cast ingot preheating and compression step, it is characterized in that: described compression step is as follows:
At first, advance by extruding pin control system control extruding pin, bring the front end of extruding pin the work zone of extrusion die into gradually, utilize the extrusion axis control system to begin extruding, the aluminium alloy cast ingot after the preheating forms the body of wall thickness by the front end of extruding pin under the extruding force effect;
Then, the maximum cross-section end that will push pin by extruding pin control system is brought the work zone of extrusion die into, extruding pin stop motion forms the thin body of wall by the aluminium alloy cast ingot of extrusion axis control system after with preheating, after the thin body length of wall reaches designing requirement under the extruding force effect;
At last, retreat by extruding pin control system control extruding pin, the front end of extruding pin withdraws from the work zone of extrusion die gradually, under the extruding force effect, form the body of wall thickness by the aluminium alloy cast ingot of extrusion axis control system after with preheating, advancing, stop, retreating and form the changeable seamless Al-alloy pipe of pipe thickness by the extruding pin.
Further scheme of the present invention: in the described compression step, the extruding pin advances, and the tube wall that the front end by the extruding pin forms is from thick attenuation gradually; The extruding pin retreats, and the tube wall that the front end by the extruding pin forms is from thin thickening gradually.
Further scheme of the present invention: in the described compression step, pin control system control extruding pin repeatedly advances by pushing, the fall back loop motion forms the diverse seamless Al-alloy pipe of pipe thickness.
Further scheme of the present invention: in the described compression step, advance, retreat and the length of dwell time can form tube wall and is seamless Al-alloy pipe or the tube wall thickness seamless Al-alloy pipe not of uniform size that " thick-thin-thick " cycle changes by control extruding pin.
Further scheme of the present invention: the front end of described extruding pin is difformity.
Further scheme of the present invention: the front end of described extruding pin is the tack cone.
Two of purpose of the present invention is achieved through the following technical solutions:
The seamless Al-alloy pipe that a kind of pipe thickness is changeable is characterized in that: described seamless Al-alloy pipe is two ends thickness of pipe wall, hollow pipe that the middle part tube wall is thin.
Further scheme of the present invention: the tube wall of described seamless Al-alloy pipe also can be the variation of " thick-thin-thick " cycle.
Further scheme of the present invention: the tube wall of described seamless Al-alloy pipe has tapering for thicker section.
Beneficial effect of the present invention:
1) processing unit (plant) of the present invention is simple in structure, and simple and convenient processing method is advanced, stops, being retreated by extruding pin control system control extruding pin, and forms the two ends thickness of pipe wall under the effect of extruding force, the seamless Al-alloy pipe that middle tube wall is thin.Pin control system control extruding pin repeatedly advances by pushing, the fall back loop motion can form the changeable seamless Al-alloy pipe of pipe thickness, and the production efficiency height of this processing method.
2) the present invention can be according to the needs in fields such as machine-building, oil, the energy, ocean, produce the seamless Al-alloy pipe that meets corresponding thickness variation, this tubing has been saved material, has alleviated the weight of tubing self, strengthened the firm performance of tubing, also be convenient to be connected with other parts.Enlarged the range of application of seamless Al-alloy pipe by the present invention, the economic development of industry has been had great importance.
Description of drawings
Fig. 1 is the structural representation before the extruding of prior art seamless pipe extrusion die.
Structural representation when Fig. 2 is the extruding of prior art seamless pipe extrusion die.
Fig. 3 is the structural representation of prior art extruding pin.
Fig. 4 is tapered tubing schematic diagram of prior art stage.
Fig. 5 is the tapered tubing schematic diagram of prior art gradual change.
Structural representation when Fig. 6 is 1 extruding of this specific embodiment.
Fig. 7 is the structural representation of extruding pin in this specific embodiment 1.
Fig. 8 is that the two ends of this specific embodiment 1 formation are thick, the cut-away view of the seamless Al-alloy pipe of intermediate thin.
Fig. 9 is seamless that the cycle changes for the pipe thickness " thick-thin-thick " that this specific embodiment 2 forms
The cut-away view of aluminium-alloy pipe.
Figure 10 is the cut-away view of the tube wall thickness of this specific embodiment 3 formation seamless aluminium alloy not of uniform size.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
Specific embodiment 1:
As Fig. 6, Fig. 7 and shown in Figure 8, the process units of the seamless Al-alloy pipe that a kind of pipe thickness is changeable comprises that recipient, extrusion die 3, extrusion axis, extruding pad, extruding pin 2, mould support etc.
The production method of the seamless Al-alloy pipe that a kind of pipe thickness is changeable comprises mould and die preheating, aluminium alloy cast ingot 1 preheating and compression step, and mould and die preheating comprises the recipient preheating again, extruding pad preheating and extrusion die preheating.Described compression step is as follows:
At first, the aluminium alloy cast ingot 1 that preheating is good is packed in the recipient, to move in the recipient by extrusion axis, to push pin 2 passes the extrusion axis central through hole and is squeezed in the aluminium alloy cast ingot 1, advance by extruding pin control system control extruding pin 2, bring the front end of extruding pin 2 work zone of extrusion die 3 into gradually, utilize the extrusion axis control system to begin extruding, the aluminium alloy cast ingot 1 after the preheating forms the body of wall thickness by the front end of extruding pin 2 under the extruding force effect;
Then, the maximum cross-section end that will push pin 2 by extruding pin control system is brought the work zone of extrusion die 3 into, 2 stop motions of extruding pin, under the extruding force effect, form the thin body of wall by the aluminium alloy cast ingot 1 of extrusion axis control system after with preheating, after the thin body length of wall reaches designing requirement;
At last, retreat by extruding pin control system control extruding pin 2, the front end of extruding pin 2 withdraws from the work zone of extrusion die 3 gradually, under the extruding force effect, form the body of wall thickness by the aluminium alloy cast ingot 1 of extrusion axis control system after with preheating, by the advancing, stop, retreating and form the changeable seamless Al-alloy pipe of pipe thickness of extruding pin 2, by cutting machine the seamless Al-alloy pipe that forms is downcut.
The front end of described extruding pin 2 is the tack cone, can be designed to the cone that the bottom surface radius size differs according to product needed.
In the described compression step, when extruding pin 2 advances, the A point of extruding pin 2 front ends is introduced into the work zone of extrusion die 3, the B point that pushes pin 2 then enters the work zone of extrusion die 3, and the A point is the smallest cross-sectional end of extruding pin 2, and the B point is the maximum cross-section end of extruding pin 2, under the effect of extruding force, the pipe thickness maximum that A point by extruding pin 2 forms, the pipe thickness minimum of B point formation, so push pipe thickness that the front end of pin 2 forms from thick attenuation gradually when advancing.
After the B point of extruding pin 2 enters the work zone of extrusion die 3,2 stop motions of extruding pin, the tube wall that process this moment is the thinnest.
Extruding pin 2 is when retreating, and the B point of extruding pin 2 withdraws from the work zone of extrusion die 3 earlier, and the A point that pushes pin 2 front ends then withdraws from the work zone of extrusion die 3, so pushes tube wall that the front end of pin 2 forms from thin thickening gradually when retreating.Can adjust tube wall from thick to thin or from being thinned to thick length by the time that control extruding pin 2 advances, retreats.
The seamless Al-alloy pipe 4 that present embodiment processing generates is two ends thickness of pipe wall, hollow pipe that the middle part tube wall is thin, and the tube wall of described seamless Al-alloy pipe 4 has tapering for thicker section.
As: the aluminium alloy drill pipe requires tubing two ends thickness of pipe wall, and the intervalve wall thickness can be produced the seamless pipe that meets this requirement by adopting pressing method of the present invention.
Specific embodiment 2:
As shown in Figure 9, the characteristics of present embodiment are: pin control system control extruding pin advances for more than 2 time by pushing, fall back loop forms the changeable seamless Al-alloy pipe 4 of tube wall thickness, and push pin 2 at every turn and advance, retreat and the unanimity of dwell time can form tube wall and is the seamless Al-alloy pipe 4 that " thick-thin-thick " cycle changes, other characteristics are identical with specific embodiment 1.
Present embodiment by extruding pin control system control extruding pin 2 advance for twice, the fall back loop motion forms pipe thickness and is the seamless Al-alloy pipe 4 that " thick-thin-thick " two cycles change.
Specific embodiment 3:
As shown in figure 10, the characteristics of present embodiment are: pin control system control extruding pin advances for more than 2 time by pushing, fall back loop forms the changeable seamless Al-alloy pipe 4 of tube wall thickness, and push pin 2 at every turn and advance, retreat and the difference of dwell time forms tube wall thickness seamless Al-alloy pipe 4 not of uniform size, other characteristics are identical with specific embodiment 1.
In the present embodiment, advance, retreat the first time of extruding pin 2 and dwell time short, advance, retreat for the second time and dwell time long, formation tube wall thickness seamless Al-alloy pipe 4 not of uniform size.
Some industrial circle needs middle certain of tubing wall thickness, in order to be connected with other devices, adopts the inventive method can produce this tubing.
Specific embodiment 4:
The characteristics of present embodiment are: the front end of described extruding pin 2 is difformity, as: semicircle, oval, other characteristics and specific embodiment 1 or specific embodiment 2 or specific embodiment 3 are identical.
Claims (9)
1. the production method of the seamless Al-alloy pipe that a pipe thickness is changeable comprises mould and die preheating, aluminium alloy cast ingot (1) preheating and compression step, and it is characterized in that: described compression step is as follows:
At first, advance by extruding pin control system control extruding pin (2), the front end that will push pin (2) is brought the work zone of extrusion die (3) gradually into, utilize the extrusion axis control system to begin extruding, the aluminium alloy cast ingot after the preheating (1) forms the body of wall thickness by the front end of extruding pin (2) under the extruding force effect;
Then, the maximum cross-section end that will push pin (2) by extruding pin control system is brought the work zone of extrusion die (3) into, the stop motion of extruding pin (2), under the extruding force effect, form the thin body of wall by the aluminium alloy cast ingot (1) of extrusion axis control system after with preheating, after the thin body length of wall reaches designing requirement;
At last, retreat by extruding pin control system control extruding pin (2), the front end of extruding pin (2) withdraws from the work zone of extrusion die (3) gradually, under the extruding force effect, form the body of wall thickness by the aluminium alloy cast ingot (1) of extrusion axis control system after with preheating, advancing, stop, retreating and form the changeable seamless Al-alloy pipe (4) of pipe thickness by extruding pin (2).
2. require the production method of the changeable seamless Al-alloy pipe of 1 described a kind of pipe thickness as requested, it is characterized in that: in the described compression step, extruding pin (2) advances, and the tube wall that the front end by extruding pin (2) forms is from thick attenuation gradually; Extruding pin (2) retreats, and the tube wall that the front end by extruding pin (2) forms is from thin thickening gradually.
3. the production method of the seamless Al-alloy pipe that a kind of pipe thickness according to claim 1 and 2 is changeable, it is characterized in that: in the described compression step, pin control system control extruding pin (2) repeatedly advances by pushing, the fall back loop motion forms the changeable seamless Al-alloy pipe (4) of pipe thickness.
4. the production method of the seamless Al-alloy pipe that a kind of pipe thickness according to claim 3 is changeable, it is characterized in that: in the described compression step, advance, retreat and the length of dwell time can form tube wall and is seamless Al-alloy pipe (4) or the tube wall thickness seamless Al-alloy pipe (4) not of uniform size that " thick-thin-thick " cycle changes by control extruding pin (2).
5. the production method of the seamless Al-alloy pipe that a kind of pipe thickness according to claim 1 and 2 is changeable, it is characterized in that: the front end of described extruding pin (2) is difformity.
6. the production method of the seamless Al-alloy pipe that a kind of pipe thickness according to claim 5 is changeable, it is characterized in that: the front end of described extruding pin (2) is the tack cone.
7. seamless Al-alloy pipe that pipe thickness is changeable is characterized in that: described seamless Al-alloy pipe (4) is two ends thickness of pipe wall, hollow pipe that the middle part tube wall is thin.
8. the changeable seamless Al-alloy pipe of a kind of pipe thickness according to claim 7 is characterized in that: the tube wall of described seamless Al-alloy pipe (4) also can be " thick-thin-thick " cycle to be changed.
9. according to claim 7 or the changeable seamless Al-alloy pipe of 8 described a kind of pipe thicknesses, it is characterized in that: the tube wall of described seamless Al-alloy pipe (4) has tapering for thicker section.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101753070A CN103240293A (en) | 2013-05-10 | 2013-05-10 | Seamless aluminum-alloy pipe with variable pipe wall thickness and production method thereof |
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| CN2013101753070A CN103240293A (en) | 2013-05-10 | 2013-05-10 | Seamless aluminum-alloy pipe with variable pipe wall thickness and production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105537308A (en) * | 2016-01-26 | 2016-05-04 | 中国重型机械研究院股份公司 | External variable-diameter aluminum alloy seamless pipe extrusion production method |
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| EP0769334A1 (en) * | 1995-03-16 | 1997-04-23 | Mitsubishi Aluminum Co.,Ltd. | Variable cross section extruding die and variable cross section extrusion molding method |
| US20060131949A1 (en) * | 2004-10-28 | 2006-06-22 | Mamad Jahani | Tubular articles with varying wall thickness and method of manufacturing same |
| CN102019303A (en) * | 2009-09-14 | 2011-04-20 | 上海海隆石油管材研究所 | Device and method for preparing aluminum alloy drill rod tube body |
| CN102296934A (en) * | 2011-07-29 | 2011-12-28 | 哈尔滨中飞新技术股份有限公司 | Aluminum alloy drill pipe and production method thereof |
| CN202555618U (en) * | 2012-02-28 | 2012-11-28 | 上海海隆石油管材研究所 | Extrusion die for making variable cross-section aluminium alloy pipe in internal upset form |
| CN202715641U (en) * | 2012-08-28 | 2013-02-06 | 淄博斯壮铝业有限公司 | Machining device for internal upset aluminum alloy drill pipe body |
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2013
- 2013-05-10 CN CN2013101753070A patent/CN103240293A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1087037A (en) * | 1992-11-18 | 1994-05-25 | 徐可清 | Thin-wall template pipes extrusion process and equipment |
| EP0769334A1 (en) * | 1995-03-16 | 1997-04-23 | Mitsubishi Aluminum Co.,Ltd. | Variable cross section extruding die and variable cross section extrusion molding method |
| US20060131949A1 (en) * | 2004-10-28 | 2006-06-22 | Mamad Jahani | Tubular articles with varying wall thickness and method of manufacturing same |
| CN102019303A (en) * | 2009-09-14 | 2011-04-20 | 上海海隆石油管材研究所 | Device and method for preparing aluminum alloy drill rod tube body |
| CN102296934A (en) * | 2011-07-29 | 2011-12-28 | 哈尔滨中飞新技术股份有限公司 | Aluminum alloy drill pipe and production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105537308A (en) * | 2016-01-26 | 2016-05-04 | 中国重型机械研究院股份公司 | External variable-diameter aluminum alloy seamless pipe extrusion production method |
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Address after: 528231 Guangdong province Dali Nanhai District of Foshan City Industrial Zone head Applicant after: GUANGDONG WEIYE ALUMINIUM FACTORY GROUP CO., LTD. Address before: 528231 Guangdong province Dali Nanhai District of Foshan City Industrial Zone head Applicant before: Guangdong Weiye Aluminium Factory Co., Ltd. |
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Application publication date: 20130814 |