CN104607484B - Refrigeration system aluminium capillary tube preparation method - Google Patents
Refrigeration system aluminium capillary tube preparation method Download PDFInfo
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- CN104607484B CN104607484B CN201510063354.5A CN201510063354A CN104607484B CN 104607484 B CN104607484 B CN 104607484B CN 201510063354 A CN201510063354 A CN 201510063354A CN 104607484 B CN104607484 B CN 104607484B
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- core
- refrigeration system
- core rod
- base pipe
- capillary tube
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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
-
- 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
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/16—Mandrels; Mounting or adjusting same
-
- 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
- B21C9/00—Cooling, heating or lubricating drawing material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Abstract
The present invention discloses a kind of refrigeration system aluminium capillary tube preparation method, aluminum base pipe is drawn using cold drawn technology, drawing mould is used during drawing, the mould includes external mold and the core rod being engaged, core rod therein has core print sizing portion, middle conus portion and core tail cylindrical portion, the drawing power of aluminum base pipe increases and increased with the fixed length through portion of core print, and travelling core rod carries out disk throwing pipe, forms refrigeration system aluminium capillary.The present invention has gone out aluminium capillary using aluminium and aluminium alloy as developing material, and refrigeration system capillary aluminium reduces solder joint, improve the performance of product while also reduce equipment production cost for copper scheme.
Description
Technical field
The present invention discloses a kind of refrigeration system aluminium capillary tube preparation method, belongs to by International Patent Classification (IPC) (IPC) division
Refrigeration system capillary manufacturing technology field.
Background technology
Capillary in air-conditioning, refrigerator refrigeration system belongs to expansion gear (or being throttling arrangement), is cooling cycle system
One indispensable basic element of character.At present, in cooling cycle system, capillary is usually made of copper, is connected to condenser
Between evaporator, capillary produces pressure drop along its length according to its flow resistance, to control the flow of refrigerant and maintenance
The pressure difference of condenser and evaporator.
The copper capillaries used mostly in existing refrigeration system, defect are cost height, in whole system because pipeline it is more,
Solder joint is more, causes the probability of leakage big, product quality risk is high.Document CN2014101059820 discloses a kind of copper/Al bimetal
Capillary, document CN2014101061549 disclose a kind of high-performance copper/titanium bimetallic capillary, document
A kind of copper of CN201410272511.9/phosphorus bimetallic capillary, foregoing each capillary are by the compound of copper and another metal
Pipe, not single aluminum capillary.Document CN201110061527.1 discloses a kind of system of capillary copper aluminium welding joint
Preparation Method, further relate to use socket joint type copper end aluminium capillary made from the above method.
Aluminium is a kind of light-weight metal, has good ductility, conduction and heat conductivility, high reflectivity and oxidative resistance,
Applied using aluminium as condenser and evaporator in field of automobile air conditioner, but because the limitation of processing technology is not applied also
Capillary in refrigeration system.Chinese document CN200910145169.5 discloses a kind of Hubbing method of high-precision aluminum pipe, first complete
Aluminum pipe pipe before being pulled out into essence, wall heating carries out finish draw, profit in aluminum pipe pipe before then essence is pulled out using high-frequency induction heating apparatus
Precision can be drawn out with this method and reaches 0-0.03MM high-precision aluminum pipes, but this method is adapted to the big aluminum pipe of caliber, such as document
In embodiment more than aluminum pipe external diameter 30mm, more than internal diameter 20mm.It is foregoing and the internal diameter of capillary is 0.5~2mm in refrigeration system
Aluminum pipe Hubbing method can not be realized；Because copper, aluminium material are different, aluminum hair can not equally be realized using current drawing copper tubes technology
Tubule.
In the modern times that white domestic appliances market competition is fierce, it is manufacturing enterprise's top priority to reduce cost and improve performance, aluminium phase
There is heat transfer property Gao ﹑ Jia Ge Di ﹑ density small for copper and the advantage such as aboundresources, refrigerator ice cabinet full aluminium system of freezing is exactly
It is caused in this context, and the aluminium capillary of inventor's research and development is exactly the new replacement production of coordinate full aluminium system to carry out one
Product.
The content of the invention
In view of the shortcomings of the prior art, the invention provides a kind of refrigeration system aluminium capillary tube preparation method, use are special
Mould carries out drawing, forms satisfactory refrigeration system aluminium capillary.
To reach above-mentioned purpose, the present invention is achieved by the following technical solutions：
A kind of refrigeration system aluminium capillary tube preparation method, aluminum base pipe is drawn using cold drawn technology, adopted during drawing
With drawing mould, the mould includes external mold and the core rod being engaged, and core rod therein has core print sizing portion, the drawing of aluminum base pipe
Power processed increases and increased with the fixed length through portion of core print, and travelling core rod carries out disk throwing pipe, forms refrigeration system aluminium capillary.
Further, the core rod also has middle conus portion and core tail cylindrical portion, and core print sizing minister's degree is by below equation
It is determined that：Unit mm；
Wherein D is core tail body diameter, unit mm,
D is that core print is determined through portion's body diameter, unit mm,
F coefficient of friction between base pipe and core print, f=0.10~0.12,
L1 is middle conus portion length, unit mm；
U=4~6.
Further, the aluminum base pipe draws power and is increased by the fixed length through portion of core print and increased, and be in line relation.
Further, the external mold has deformed area, and the drawing of aluminum base pipe can just play tube reducing to core rod in deformed area all the time
With subtract wall, the taper α of external mold deformed area is more than the taper β of core rod, and both tapers differences are no more than 3 degree.
Further, external mold taper α=12 degree, core rod taper β=9 degree, the pulling force of aluminum base pipe is minimum, stability
It is good, draw tubule to be not easy to break.
Further, aluminum base pipe draws shaping by multi-pass, and every time draft exists in 50%-65%, wall cut rate
Rev/min 18.3%-23.8%, drawing speed is in 25-35n/min, i.e.,.
Further, lubricating oil is injected when aluminum base pipe is drawn into pipe, ensures core rod energy sufficient lubrication in drawing process,
And retaining hole is beaten at away from termination certain length, core back is prevented, mold core head is smoothly entered deformed area and forms lining drawing.
Further, the aluminum base thickness of pipe wall is uniform, and deviation can not be more than 0.08-0.13 ㎜；Base pipe elongation percentage must reach
To 55 more than ﹪, more than the ﹪ of tension 75.
For external diameter in below the ㎜ of ￠ 3.0, its elongation percentage reaches 8 more than ﹪ after aluminium capillary finished product, and tension reaches 98 more than ﹪.
The capillary of aluminum of the present invention only has its three point compared to copper capillary cost, and can reduce the consumption of copper
Amount, mitigates the weight of air conditioner, and compared with prior art, the manufacturing cost of refrigeration plant is lower, is carried so economic benefit is relative
It is much higher, calculated 1 year cost-saved 100,000,000 or so with national 80,000,000 production capacity of output.
Brief description of the drawings
Fig. 1 is inventive die schematic diagram.
Fig. 2 is base pipe retaining hole of the present invention schematic diagram.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings：
Embodiment：Refer to Fig. 1 and Fig. 2, a kind of refrigeration system aluminium capillary tube preparation method, by aluminum base pipe 3 using cold
Pull technology is drawn, and drawing mould is used during drawing, and the mould includes external mold 1 and the core rod 2 being engaged, core rod tool therein
There is core print sizing portion 21, the drawing power of aluminum base pipe increases and increased with the fixed length through portion of core print, and travelling core rod carries out disk drawing
Base pipe, form refrigeration system aluminium capillary.The core rod 2 of the present invention also has middle conus portion 22 and core tail cylindrical portion 23, core print
Sizing minister's degree is determined by below equation：Unit mm；Wherein D is core tail body diameter, unit
Mm, d are that core print is fixed through portion's body diameter, unit mm, the f coefficient of friction between base pipe and core print, f=0.10~0.12, during L1 is
Between conus portion length, unit mm；U=4~6.
Core rod integrated formed structure in the present invention, core print sizing portion, middle conus portion and core are followed successively by from front end to rear end
Tail cylindrical portion.
Aluminum base pipe 3 of the present invention, which draws power, to be increased and increased by the fixed length through portion 21 of core print, and be in line relation.External mold 1
With tapered deformed area, the drawing of aluminum base pipe can just play tube reducing and subtract wall core rod in deformed area all the time, external mold deformation
The taper α in area is more than the taper β of core rod, and both taper differences are no more than 3 degree.When external mold taper α=12 degree, core rod taper β=9
Degree, the pulling force of aluminum base pipe is minimum, and stability is good, draws tubule to be not easy to break.Aluminum base pipe 3 of the present invention is drawn into by multi-pass
Type, every time draft in 50%-65%, wall cut rate in 18.3%-23.8%, drawing speed in 25-35n/min, that is, turn/
Point.Aluminum base pipe 3 injects lubricating oil into pipe when drawing, ensure core print energy sufficient lubrication in drawing process, and away from termination
Retaining hole 31 is beaten at certain length, prevents core back, the head of core rod 2 is smoothly entered deformed area and forms lining drawing.The present invention's
Aluminum base thickness of pipe wall is uniform, and deviation can not be more than 0.08-0.13 ㎜；Base pipe elongation percentage must reach 55 more than ﹪, the ﹪ of tension 75
More than.
The present invention has gone out aluminium capillary using aluminium alloy as developing material, and refrigeration system capillary aluminium subtracts for copper scheme
Solder joint is lacked, the performance for improving product is both to also reduce cost.That claimed is the ㎜ of ￠ 3.0 of all aluminums
The capillary that following refrigeration industry uses.The material of aluminium hollow billet is aluminium and aluminium alloy, is drawn using cold drawn technology, method
It is that travelling core rod carries out disk drawing, key point is the technique of design and the drawing of mould：
1. the design of mould
1.1. external mold and core rod design are reasonable, and core rod can just play a part of tube reducing in deformed area and subtract wall all the time.
The angle of external mold deformed area and the taper difference of core rod are no more than 3 degree, α ＞ β, and modular angle α=12 degree, core rod taper β=9 degree pulling force is most
Small, stability is good, draws tubule to be not easy to break.
α, β of the present invention and its matching such as following table：
1.2. the length passed through surely is reduced as far as possible on the premise of stability is ensured, the length passed through surely influences to draw the change of power
Change.Drawing power is increased and increased by the length for determining warp, and be in line relation.
2, drawing process
2.1, lubricating condition, the reasonable selection of lubricant is to improve product quality, reduces energy consumption, improves the main of lumber recovery
Link, lubricant is different, and coefficient of friction f is also different, and f not only influences the size of frictional force, also influences core print in the steady of deformed area
It is qualitative.Moving about stability with f increase will reduction.Therefore drawn aluminum capillary must with special lubricating oil xc2841. this
Sample could reduce coefficient of friction, improve stability.
2.2 drawing speeies, rate of deformation improve with the increase of drawing speed.Rate of deformation improves, and makes the change of material
Shape drag is raised, and it is beneficial to floating core head stability that pulling capacity increase, which improves drawing speed, and aluminium capillary is drawn by testing
Most rational speed is to determine corresponding rotating speed according to different specifications.
2.3 rationally design per pass technique, and passage draft has a great influence to travelling stability, and every time draft exists
50%-65% is optimal, and wall cut rate is optimal in 18.3%-23.8%.
2.4 in practical operation, injects lubricating oil into pipe, ensures core print energy sufficient lubrication in drawing process, and
Away from retaining hole is beaten at the certain length of termination, prevent core print from retreating, core print is smoothly entered deformed area, form lining and draw.
Requirement of the drawing of 2.5 aluminium capillaries to base pipe is very high
2.5.1 base thickness of pipe wall is uniform, and deviation can not be more than 0.08-0.13 ㎜.
2.5.2 surface can not aoxidize, it is impossible to produce oxide skin and flour.
2.5.3 base pipe elongation percentage must reach 55 more than ﹪, more than the ﹪ of tension 75.
2.5.4 to reach three elements (1) elongation percentage after capillary finished product and reach 8 ﹪, tension reaches 98 ﹪ (2) pressurizes 15
Kilogram leak-free pressure.(3) same units length flow is consistent.
It is the bad pipe drawing technique drawing result in part of the present invention below, unit mm:
| Sequence number | Measure internal diameter | Error | As a result |
| 1 | 12.82 | 0.02 | It is qualified |
| 2 | 12.86 | 0.06 | It is unqualified |
| 3 | 12.83 | 0.03 | It is qualified |
| 4 | 12.81 | 0.01 | It is qualified |
| 5 | 12.82 | 0.02 | It is qualified |
| 6 | 12.82 | 0.02 | It is qualified |
| 7 | 12.83 | 0.03 | It is qualified |
| 8 | 12.81 | 0.01 | It is qualified |
Counted using above table, present invention process capillary yields is more than 95%.
The capillary of aluminum of the present invention only has its three point compared to copper capillary cost, is carried so economic benefit is relative
It is much higher, calculated 1 year cost-saved 100,000,000 or so with national 80,000,000 production capacity of output.
Described in above, only this wound is used using the embodiment of this origination techniques content, any those skilled in the art
Make done modifications and changes, all belong to the scope of the claims of this creation opinion, and be not limited to those disclosed embodiments.
Claims (8)
- A kind of 1. refrigeration system aluminium capillary tube preparation method, it is characterised in that：Aluminum base pipe is drawn using cold drawn technology, Drawing mould is used during drawing, the mould includes external mold and the core rod being engaged, and core rod therein has core print sizing portion, aluminum The drawing power of base pipe increases and increased with the length in core print sizing portion, and travelling core rod carries out disk throwing pipe, forms refrigeration system aluminium Capillary, external diameter is in below the ㎜ of ￠ 3.0 after aluminium capillary finished product；The external mold has tapered deformed area, and the drawn aluminum base pipe in deformed area can just play tube reducing and subtract core rod all the time Wall, the taper α of external mold deformed area are more than the taper β of core rod；The core rod also has middle conus portion and core tail cylindrical portion, and core print sizing minister's degree is determined by below equation：Unit mm；Wherein D is core tail body diameter, unit mm,D is core print sizing portion body diameter, unit mm,F coefficient of friction between base pipe and core print, f=0.10~0.12,L1 is middle conus portion length, unit mm；U=4~6.
- 2. refrigeration system aluminium capillary tube preparation method according to claim 1, it is characterised in that：The aluminum base pipe is drawn Power is increased and increased by the length in core print sizing portion, and be in line relation.
- 3. refrigeration system aluminium capillary tube preparation method according to claim 1, it is characterised in that：The external mold deformed area Both the taper β of taper α and core rod tapers difference is no more than 3 degree.
- 4. refrigeration system aluminium capillary tube preparation method according to claim 3, it is characterised in that：The external mold taper α= 12 degree, core rod taper β=9 degree, the pulling force of aluminum base pipe is minimum, and stability is good, draws tubule to be not easy to break.
- 5. refrigeration system aluminium capillary tube preparation method according to claim 1, it is characterised in that：Aluminum base pipe passes through multiple tracks Secondary to draw shaping, every time draft is in 50%-65%, and wall cut rate is in 18.3%-23.8%, and drawing speed is in 25-35n/ min。
- 6. refrigeration system aluminium capillary tube preparation method according to claim 1, it is characterised in that：Aluminum base pipe draw when to Lubricating oil is injected in pipe, ensures core rod energy sufficient lubrication in drawing process, and retaining hole is beaten at away from termination certain length, is prevented Only core back, mold core head is smoothly entered deformed area and form lining drawing.
- 7. refrigeration system aluminium capillary tube preparation method according to claim 1, it is characterised in that：The aluminum base thickness of pipe wall Uniformly, deviation can not be more than 0.13 ㎜；Base pipe elongation percentage must reach 55 more than ﹪, more than the ﹪ of tension 75.
- 8. the refrigeration system aluminium capillary tube preparation method according to one of claim 1 to 7, it is characterised in that：Aluminium capillary Tension reaches 98 more than ﹪.
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| CN201510063354.5A CN104607484B (en) | 2015-02-06 | 2015-02-06 | Refrigeration system aluminium capillary tube preparation method |
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| CN201510063354.5A CN104607484B (en) | 2015-02-06 | 2015-02-06 | Refrigeration system aluminium capillary tube preparation method |
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| CN104607484B true CN104607484B (en) | 2017-11-14 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107838210A (en) * | 2016-09-20 | 2018-03-27 | 常州常宝精特钢管有限公司 | A kind of self-positioning travelling internal model of Tube Drawing mould |
| CN107144052A (en) * | 2017-06-20 | 2017-09-08 | 合肥太通制冷科技有限公司 | Aluminium alloy capillary and the return-air pipe assembly with it |
| CN107282690A (en) * | 2017-07-20 | 2017-10-24 | 繁昌县华特机械制造有限公司 | A kind of Stainless Steel Capillary pipe processing technique |
| CN108787784A (en) * | 2018-04-27 | 2018-11-13 | 浙江康盛股份有限公司 | A kind of production method of aluminium capillary |
| CN108637034A (en) * | 2018-05-16 | 2018-10-12 | 黑龙江工程学院 | The manufacturing method of high-magnesium aluminum alloy thin-wall circular tube |
| IT201800006938A1 (en) * | 2018-07-05 | 2020-01-05 | Continuous process of production of capillaries in non-ferrous alloys. | |
| CN111520939A (en) * | 2020-06-01 | 2020-08-11 | 安徽兴盛达制冷铜管制造有限公司 | Aluminum capillary tube of refrigeration system and preparation method |
| CN116274447B (en) * | 2023-03-06 | 2024-08-16 | 四川万圣通实业有限公司 | Technological method for quick production circulation of steel pipe drawing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5519412A (en) * | 1978-07-25 | 1980-02-12 | Kobe Steel Ltd | Method of drawing multiple protruding flights spirally extending on inside surface of pipe |
| JP2005046906A (en) * | 2003-07-31 | 2005-02-24 | Kobe Steel Ltd | Device and method for manufacturing inside grooved tube |
| CN101121182A (en) * | 2007-08-29 | 2008-02-13 | 高新张铜股份有限公司 | Stretching core head for hollow metal pipe |
| CN102000710A (en) * | 2008-02-01 | 2011-04-06 | 住友金属工业株式会社 | Method for manufacturing ultrathin-wall metal tube by using cold drawing method |
| CN101693260B (en) * | 2009-10-09 | 2012-01-25 | 安徽工业大学 | Method for drawing high-precision aluminum pipe |
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