CN101693260B - Method for drawing high-precision aluminum pipe - Google Patents
Method for drawing high-precision aluminum pipe Download PDFInfo
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- CN101693260B CN101693260B CN2009101451695A CN200910145169A CN101693260B CN 101693260 B CN101693260 B CN 101693260B CN 2009101451695 A CN2009101451695 A CN 2009101451695A CN 200910145169 A CN200910145169 A CN 200910145169A CN 101693260 B CN101693260 B CN 101693260B
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- aluminum pipe
- pipe
- induction heating
- heating apparatus
- frequency induction
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Abstract
The invention provides a method for drawing a high-precision aluminum pipe, belonging to the technical field of plastic processing and forming of metal. In the method, the metal deformation principle, the skin effect and the metal flow theory for drawing metal are comprehensively utilized. The method is characterized in that a high-frequency sensing and heating device is added to a common pipe drawing machine, the high-frequency sensing and heating device is arranged around a fixed short rod of the drawing machine, the high-frequency sensing and heating device comprises heating coils and a temperature detecting sensor, a pipe blank of a front aluminum pipe is precisely pulled firstly, and then the high-frequency sensing and heating device is used for heating and precisely drawing the inner wall of the pipe blank of the front aluminum pipe. The method can be used for drawing the high-precision aluminum pipe with the precision of 0.03 mm. The method is generally applicable to the drawing of pipes and can be used for processing aluminum products, and drawing and processing steel products, copper products and the like.
Description
Technical field:
The invention belongs to the Metal Forming field shaping technique, be specifically related to a kind of Hubbing method of high-precision aluminum pipe.
Background technology:
High accuracy fine aluminum alloy pipe is the very little tubing of a kind of internal diameter size permissible variation; Near the precision of machining (generally requiring the internal diameter size deviation is 0～0.03mm), head and shoulders above both at home and abroad in any one national standard to the required precision (like GB/T4436-1995, ASTMB210M-1995 etc.) of aluminium alloy pipe.Be mainly used in cylinder sleeve and some other pneumatic elements etc. of various cylinders (comprising hydraulic cylinder) of sensitization magnetic drum, the control aspect automatically of duplicator.
The same with the normal thin wall tube material, the production process of high-accuracy aluminum alloy tubing at first also is by extruding pipe to be provided, and passes through drawing or cold rolled tube then---the mode of drawing is produced finished product.But the production difficulty of high accuracy tubing is much larger than common tubing.
Will adopt lining to draw basically by production high accuracy tubing generally speaking, lining draws and comprises fixedly plug drawing, floating plug drawing, mandrel drawing, push bench process and diameter expansion method.And fixing short core print drawing and mandrel drawing are to be most the highest method of drawing precision, but are difficult to reach the requirement of high accuracy fine aluminum alloy pipe.
Because high accuracy tubing need obtain the very high internal diameter size of precision grade, but have the elastic return of pulling out the back pipe material inner wall in the actual production, elastic return has caused pulls out back tubing existence bullet variable in various degree, and the existence that plays variable directly influences the precision of tubing.Therefore, how solving the influence that elastic return brings for the pipe internal diameter dimensional accuracy is a great problem of producing high-precision aluminum pipe.
The method that improves the tubing precision at present is the Changing Pattern through Study of finite element simulation pipe internal diameter size; Drawer's die parameters reasonable in design; Work out rational deformation technique system; Control tubing internal diameter size changes (seeing " heavy-duty machinery " 2005, the 1 phases " middle plug position is to the finite element modelling of pipe internal diameter dimensional accuracy influence ").But this method is only feasible in theory, and pulls out the elastic return of back pipe material inner wall, and elastic return has caused pulls out back tubing existence bullet variable in various degree, still can't solve.
Summary of the invention:
The present invention provides a kind of Hubbing method of high-precision aluminum pipe, is according to the flow of metal principle, and metal flow is theoretical when high-frequency induction heating kelvin effect and metal drawing, a kind of new high-precision aluminum pipe Hubbing method of invention.
The flow of metal principle:
Metal is done the time spent in the external force that receives above the yield stress limit, and plastic deformation can take place, and is attended by the elasticity sex change simultaneously.Plastic deformation still can keep when external force is removed, and elasticity sex change meeting recovers, and this is to cause to pull out the unmanageable most important reason of back tubing precision.Increase according to flow of metal principle deformable metal temperature rising plastic deformation of metal proportion, the strain proportion reduces.So the present invention carries out drawing with METAL HEATING PROCESS to suitable temperature, reduce the elastic return of pulling out the back pipe material inner wall, improve the tube-drawing precision.
Kelvin effect:
If all heat metal pipe material, intensity also descending, is easy to cause and breaks when the strain proportion reduces.So must carry out surperficial shallow-layer heating.The kelvin effect of high-frequency induction heating is exactly that electric current will concentrate on conductive surface and flow through when alternating current passes through conductor, and the high more this phenomenon of frequency is obvious more, can realize shallow heating.So the present invention has adopted high-frequency induction heating, only internal surface of pipe is heated.
Metal flow is theoretical during metal drawing:
In the tube-drawing process, the surfaces externally and internally that metal deformation is mainly concentrated when deflection is little, one drawing in the end adds man-hour according to this theory, and ancient piece of jade, round, flat and with a hole in its centre small deformation amount drawing processing in the present invention adopts is to guarantee the pipe internal diameter size.
According to above-mentioned principle; The present invention provides a kind of Hubbing method of high-precision aluminum pipe, and this method utilizes the high-frequency heating method that the aluminum pipe inner wall surface is heated to uniform temperature, reduces resilience; Guarantee the still very low and strength of materials of temperature at other position of aluminum pipe simultaneously, in case break; The high temperature place on ancient piece of jade, round, flat and with a hole in its centre surface in ancient piece of jade, round, flat and with a hole in its centre small deformation amount drawing processing guarantees to be out of shape and occurs over just in adopting in addition.
Hubbing method provided by the present invention is specific as follows:
1, on common tubing drawbench, increases a high-frequency induction heating apparatus; High-frequency induction heating apparatus be installed in the fixing short core print of drawbench around; This high-frequency induction heating apparatus comprises heater coil and temperature detection sensor, and concrete installation site and high-frequency induction heating apparatus structure are seen shown in Figure of description 1 and the Figure of description 2.
The parameter of high-frequency induction heating apparatus is following:
Working power: single-phase 220V/50Hz;
Operating voltage range: 180V～250V;
Maximum input current: 5-100A;
Hunting power: 1-20KVA;
Frequency of oscillation: 40～160KHz.
2, earlier aluminum pipe pipe external diameter, internal diameter are pulled to following size:
D
1＝D+0～6mm
d
1＝d+0.5～1mm
D
1, d
1---respectively is the external diameter and the internal diameter of aluminum pipe tubing before the finish draw;
D, d----are respectively aluminum pipe tubing target external diameter and internal diameter;
Accomplish essence and pull out preceding aluminum pipe pipe.
3, utilize high-frequency induction heating apparatus that essence is pulled out before in the aluminum pipe pipe ancient piece of jade, round, flat and with a hole in its centre be heated to 100-300 ℃, carry out finish draw then, finish draw technology is: outside dimension processing capacity 0-6mm, internal diameter processing capacity are 0.5-1mm, and drawing speed is: 5-30m/min.
Finally guarantee aluminum pipe pipe internal diameter dimensional accuracy through above Hubbing method.
Method provided by the present invention has general adaptability for tube-drawing, except that being used for aluminum profile extrusion, can also be used for drawing processing such as steel and copper material.
Description of drawings:
Fig. 1: high-frequency induction heating apparatus installation site structural representation;
Fig. 2: high-frequency induction heating apparatus structure diagram.
Among the figure: 1: high-frequency induction heating apparatus, 2: tubing, 3: fixing short core print, 4: mould; 5: heater coil, 6: temperature detection sensor.
The specific embodiment:
Certain high-precision aluminum pipe product is of a size of: external diameter 30mm, internal diameter 20mm.Dimensional accuracy mainly is that the internal diameter requirement is 0～0.03mm.
Adopt common drawing process drawing, measured 11 aluminum pipes altogether, last size is as shown in table 1:
The common drawing process drawing of table 1 result
There are 5 aluminum pipes defective.
Adopt Hubbing method provided by the present invention, at first pull to external diameter 33mm to aluminum pipe, internal diameter 20.6mm utilizes the induction heating apparatus in the drawbench to be heated to 150 ℃ to aluminum pipe then, carries out finish draw at last, and measurement size is as shown in table 2 after the drawing:
Table 2 Hubbing method drawing of the present invention result
From last table, find out, adopt Hubbing method drawing size provided by the present invention all qualified.
Claims (1)
1. the Hubbing method of an aluminum pipe, this Hubbing method is specific as follows:
A: on common tubing drawbench, increase a high-frequency induction heating apparatus; High-frequency induction heating apparatus be installed in the fixing short core print of drawbench around; This high-frequency induction heating apparatus comprises heater coil and temperature detection sensor, and the parameter of high-frequency induction heating apparatus is following:
Working power: single-phase 220V/50Hz;
Operating voltage range: 180V～250V;
Maximum input current: 5-100A;
Hunting power: 1-20KVA;
Frequency of oscillation: 40～160KHz;
B, elder generation pull to following size with aluminum pipe pipe external diameter, internal diameter:
D
1＝D+0～6mm
d
1＝d+0.5～1mm
D
1, d
1----is respectively the external diameter and the internal diameter of aluminum pipe tubing before the finish draw;
D, d-----are respectively aluminum pipe tubing target external diameter and internal diameter;
Accomplish the preceding aluminum pipe pipe of finish draw;
C, utilize high-frequency induction heating apparatus with finish draw before in the aluminum pipe pipe ancient piece of jade, round, flat and with a hole in its centre be heated to 100-300 ℃, carry out finish draw then, finish draw technology is: outside dimension processing capacity 0-6mm, internal diameter processing capacity are 0.5-1mm, and drawing speed is: 5-30m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101451695A CN101693260B (en) | 2009-10-09 | 2009-10-09 | Method for drawing high-precision aluminum pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101451695A CN101693260B (en) | 2009-10-09 | 2009-10-09 | Method for drawing high-precision aluminum pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101693260A CN101693260A (en) | 2010-04-14 |
| CN101693260B true CN101693260B (en) | 2012-01-25 |
Family
ID=42092286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101451695A Expired - Fee Related CN101693260B (en) | 2009-10-09 | 2009-10-09 | Method for drawing high-precision aluminum pipe |
Country Status (1)
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2645985T3 (en) * | 2012-05-14 | 2017-12-11 | Nippon Steel & Sumitomo Metal Corporation | Method for manufacturing seamless pipe |
| CN104741401A (en) * | 2013-12-27 | 2015-07-01 | 辽阳石化机械设计制造有限公司 | Electromagnetic heating drawbench |
| CN104607484B (en) * | 2015-02-06 | 2017-11-14 | 厦门华业新电热电器有限公司 | Refrigeration system aluminium capillary tube preparation method |
| DE102018100413B3 (en) * | 2018-01-10 | 2019-07-11 | Federal-Mogul Valvetrain Gmbh | Method and device for producing hollow, internally cooled valves |
| CN114603312A (en) * | 2020-12-09 | 2022-06-10 | 常州市联谊特种不锈钢管有限公司 | Production process of high-precision magnetic isolation sleeve |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU458357A1 (en) * | 1970-11-17 | 1975-01-30 | Device for dragging pipes using ultrasonic vibrations of the instrument | |
| SU564031A1 (en) * | 1976-03-19 | 1977-07-05 | Goncharov Ivan A | Device for drawing tubes |
| CN1686627A (en) * | 2005-05-10 | 2005-10-26 | 江苏法尔胜技术开发中心 | Sleeve pulling shaping method of nickel titanium base marmem pipe material |
-
2009
- 2009-10-09 CN CN2009101451695A patent/CN101693260B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU458357A1 (en) * | 1970-11-17 | 1975-01-30 | Device for dragging pipes using ultrasonic vibrations of the instrument | |
| SU564031A1 (en) * | 1976-03-19 | 1977-07-05 | Goncharov Ivan A | Device for drawing tubes |
| CN1686627A (en) * | 2005-05-10 | 2005-10-26 | 江苏法尔胜技术开发中心 | Sleeve pulling shaping method of nickel titanium base marmem pipe material |
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|---|---|
| CN101693260A (en) | 2010-04-14 |
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Application publication date: 20100414 Assignee: Ezhoushi Xinji Yaoyong Baozhuang Co., Ltd. Assignor: Anhui University of Technology Contract record no.: 2013420000143 Denomination of invention: Method for drawing high-precision aluminum pipe Granted publication date: 20120125 License type: Exclusive License Record date: 20130909 |
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Granted publication date: 20120125 Termination date: 20131009 |