CN104607484A - Preparation method of aluminum capillary tube of refrigerating system - Google Patents
Preparation method of aluminum capillary tube of refrigerating system Download PDFInfo
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- CN104607484A CN104607484A CN201510063354.5A CN201510063354A CN104607484A CN 104607484 A CN104607484 A CN 104607484A CN 201510063354 A CN201510063354 A CN 201510063354A CN 104607484 A CN104607484 A CN 104607484A
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- core
- refrigeration system
- tapering
- aluminum
- base pipe
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Classifications
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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 invention discloses a preparation method of an aluminum capillary tube of a refrigerating system. The preparation method comprises the following steps: drawing an aluminum parison tube by virtue of a cold drawing technique by using a drawing di, wherein the drawing die comprises an outer die and a die core matched with the outer die, the die core comprises a core head sizing part, a middle cone-shaped part and a core tail cylindrical part; and increasing drawing force of the aluminum parison tube along with increase of the length of the core head sizing part and moving the die core for drawing a parison tube to form the aluminum capillary tube of the refrigerating system. The aluminum capillary tube is developed by taking aluminum and an aluminum alloy as a material. According to a scheme of replacing copper with aluminum in the aluminum capillary tube of the refrigerating system, the welding point is reduced, the performance of a product is improved and the production cost of equipment is further lowered.
Description
Technical field
The present invention discloses a kind of refrigeration system aluminium capillary preparation method, divides belong to refrigeration system capillary manufacturing technology field by International Patent Classification (IPC) (IPC).
Background technology
Capillary in air-conditioning, refrigerator refrigeration system belongs to expansion gear (or being throttling arrangement), is cooling cycle system indispensable basic element of character.At present, in cooling cycle system, capillary is generally made of copper, is connected between condenser and evaporimeter, and capillary produces Pressure Drop along its length according to its flow resistance, controls the flow of cold-producing medium and maintains the pressure reduction of condenser and evaporimeter.
The copper capillaries mostly adopted in existing refrigeration system, defect is that cost is high, because pipeline is many, solder joint is many in whole system, cause the probability of leakage large, product quality risk is high.Document CN2014101059820 discloses a kind of copper/Al bimetal capillary, document CN2014101061549 discloses a kind of high-performance copper/titanium bimetallic capillary, document CN201410272511.9 copper/phosphorus bimetallic capillary, aforementioned each capillary is all the multiple tubes by copper and another kind of metal, not independent aluminum capillary.Document CN201110061527.1 discloses a kind of preparation method of capillary copper aluminium welding joint, also relates to the socket joint type copper end aluminium capillary using said method obtained.
Aluminium is a kind of light-weight metal, there is good ductility, conduction and heat conductivility, highly reflective and oxidative resistance, use aluminium as condenser and evaporimeter in the existing application of field of automobile air conditioner, but due to restriction also no application capillary in refrigeration systems of processing technology.China document CN200910145169.5 discloses a kind of Hubbing method of high-precision aluminum pipe, first complete essence and pull out front aluminum pipe pipe, then utilize high-frequency induction heating apparatus essence to be pulled out ancient piece of jade, round, flat and with a hole in its centre heating in front aluminum pipe pipe and carry out finish draw, utilize the method drawing can to go out precision and reach 0-0.03MM high-precision aluminum pipe, but the method is adapted to the large aluminum pipe of caliber, as aluminum pipe more than external diameter 30mm in document embodiment, internal diameter more than 20mm.And the internal diameter of capillary is 0.5 ~ 2mm in refrigeration system, aforementioned aluminum pipe Hubbing method cannot realize; Due to copper, aluminium material difference, adopt current drawing copper tubes technology cannot realize aluminum capillary equally.
In the modern times of white domestic appliances market competition fierceness, reducing costs raising performance is manufacturing enterprise's top priority, aluminium has the advantages such as the little and aboundresources of heat transfer property Gao ﹑ Jia Ge Di ﹑ density relative to copper, refrigerator ice cabinet full aluminium system of freezing is exactly produce in this context, and the aluminium capillary of the inventor's research and development substitute products that to be exactly of coordinating full aluminium system to carry out new.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of refrigeration system aluminium capillary preparation method, adopt particular manufacturing craft to carry out drawing, form satisfactory refrigeration system aluminium capillary.
For achieving the above object, the present invention is achieved by the following technical solutions:
A kind of refrigeration system aluminium capillary preparation method, cold drawn technology is adopted to draw aluminum base pipe, drawing mould is adopted during drawing, the core rod that this mould comprises external mold and matches, core rod wherein has core print sizing portion, the drawing power of aluminum base pipe increases with the fixed length through portion of core print and increases, and travelling core rod carries out dish throwing pipe, forms refrigeration system aluminium capillary.
Further, described core rod also has middle circle tapering and core tail cylindrical portion, and core print sizing minister degree is determined by following formula:
unit mm;
Wherein D is core tail body diameter, unit mm,
D is that core print is fixed through portion's body diameter, unit mm,
F is coefficient of friction between base pipe and core print, f=0.10 ~ 0.12,
L1 is middle circle tapering length, unit mm;
u＝4～6。
Further, described aluminum base pipe draws power to be increased by the fixed length through portion of core print increases, and be in line relation.
Further, described external mold has deformed area, core rod all the time in deformed area aluminum base pipe draw and just can play tube reducing and subtract wall, the tapering α of external mold deformed area is greater than the tapering β of core rod, and both tapering differences are no more than 3 degree.
Further, described external mold tapering α=12 degree, core rod tapering β=9 degree, the pulling force of aluminum base pipe is minimum, and good stability draws tubule not easily to break.
Further, aluminum base pipe draws shaping through multi-pass, every time draft at 50%-65%, wall cut rate at 18.3%-23.8%, drawing speed at 25-35n/min, namely rev/min.
Further, when aluminum base pipe draws, in pipe, inject lubricating oil, ensure core rod energy sufficient lubrication in drawing process, and beating retaining hole apart from certain length place, termination, prevent core back, make mold core head enter deformed area formation lining smoothly and draw.
Further, described aluminum base thickness of pipe wall is even, and deviation can not be greater than 0.08-0.13 ㎜; Base pipe percentage elongation must reach 55 more than ﹪, tension 75 more than ﹪.
After aluminium capillary finished product, external diameter is at ￠ 3.0 below ㎜, and its percentage elongation reaches 8 more than ﹪, and tension reaches 98 more than ﹪.
The capillary of aluminium matter of the present invention is compared copper capillary cost and is only had its three point, and the consumption of copper can be reduced, alleviate the weight of air-conditioner, compared with prior art, the manufacturing cost of refrigeration plant is lower, so economic benefit improves a lot relatively, calculate 1 year cost-saved about 100,000,000 with national output 8,000 ten thousand production capacity.
Accompanying drawing explanation
Fig. 1 is mould schematic diagram of the present invention.
Fig. 2 is base pipe retaining of the present invention hole schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described:
Embodiment: refer to Fig. 1 and Fig. 2, a kind of refrigeration system aluminium capillary preparation method, cold drawn technology is adopted to draw aluminum base pipe 3, drawing mould is adopted during drawing, the core rod 2 that this mould comprises external mold 1 and matches, core rod wherein has core print sizing portion 21, and the drawing power of aluminum base pipe increases with the fixed length through portion of core print and increases, travelling core rod carries out dish throwing pipe, forms refrigeration system aluminium capillary.Core rod 2 of the present invention also has middle circle tapering 22 and core tail cylindrical portion 23, and core print sizing minister degree is determined by following formula:
unit mm; Wherein D be core tail body diameter, unit mm, d be core print fixed through portion's body diameter, unit mm, f be coefficient of friction between base pipe and core print, f=0.10 ~ 0.12, L1 is middle circle tapering length, unit mm; U=4 ~ 6.
Core rod integrated formed structure in the present invention, is followed successively by core print sizing portion, middle circle tapering and core tail cylindrical portion to rear end from front end.
Aluminum base pipe 3 of the present invention draws power to be increased by the fixed length through portion 21 of core print increases, and be in line relation.External mold 1 has the deformed area in tapering, core rod all the time in deformed area aluminum base pipe draw and just can play tube reducing and subtract wall, the tapering α of external mold deformed area is greater than the tapering β of core rod, and both tapering differences are no more than 3 degree.When external mold tapering α=12 degree, core rod tapering β=9 degree, the pulling force of aluminum base pipe is minimum, and good stability draws tubule not easily to break.Aluminum base pipe 3 of the present invention draws shaping through multi-pass, every time draft at 50%-65%, wall cut rate at 18.3%-23.8%, drawing speed at 25-35n/min, namely rev/min.Aluminum base pipe 3 injects lubricating oil when drawing in pipe, ensures core print energy sufficient lubrication in drawing process, and beating retaining hole 31 apart from certain length place, termination, prevents core back, makes core rod 2 head enter deformed area formation lining smoothly and draws.Aluminum base thickness of pipe wall of the present invention is even, and deviation can not be greater than 0.08-0.13 ㎜; Base pipe percentage elongation must reach 55 more than ﹪, tension 75 more than ﹪.
The present invention adopts aluminium alloy to go out aluminium capillary as developing material, and refrigeration system capillary aluminium, for copper scheme, decreases solder joint, and the performance that improve product is both and also reduces cost.Application claims protection be ￠ 3.0 below the ㎜ of all aluminium matter refrigeration industry use capillary.The material of aluminium hollow billet is Al and Alalloy, adopts cold drawn technology to draw, and method is that travelling core rod carries out dish and draws, and key point is the design of mould and the technique of drawing:
1. the design of mould
1.1. external mold and core rod design are wanted rationally, and core rod just can play tube reducing all the time and subtract the effect of wall in deformed area.The angle of external mold deformed area and the tapering difference of core rod are no more than 3 degree, α > β, modular angle α=12 degree, and core rod tapering β=9 degree pulling force is minimum, and good stability, draws tubule not easily to break.
α, β of the present invention and coupling thereof are as following table:
1.2. under the prerequisite guaranteeing stability, reduce the length of determining warp as far as possible, the length of determining warp affects the change of drawing power.Drawing power increases by the length of determining warp increases, and be in line relation.
2, drawing process
2.1, lubricating condition, the reasonable selection of lubricant improves product quality, reduces energy consumption, improves the key link of lumber recovery, and lubricant is different, and coefficient of friction f is also different, and f not only affects the size of frictional force, also affects the stability of core print in deformed area.Increase along with f stability of moving about will reduce.Therefore draw aluminium capillary and must could reduce coefficient of friction like this with special lubricating oil xc2841., improve stability.
2.2 drawing speeies, rate of deformation improves along with the increase of drawing speed.Rate of deformation improves, and the resistance of deformation of material is raised, and pulling capacity increases and improves drawing speed is useful to floating core head stability, draws the most rational speed of aluminium capillary to be determine corresponding rotating speed according to different specifications by experiment.
2.3 appropriate design per pass techniques, passage draft is comparatively large on the impact of travelling stability, and every time draft is best at 50%-65%, and wall cut rate is best at 18.3%-23.8%.
2.4 in practical operation, in pipe, inject lubricating oil, ensures core print energy sufficient lubrication in drawing process, and beating retaining hole apart from certain length place, termination, prevents core print from retreating, make core print enter deformed area smoothly, forms lining and draws.
The drawing of 2.5 aluminium capillaries is very high to the requirement of base pipe
2.5.1 base thickness of pipe wall is even, and deviation can not be greater than 0.08-0.13 ㎜.
2.5.2 surface can not be oxidized, and can not produce oxide skin and flour.
2.5.3 base pipe percentage elongation must reach 55 more than ﹪, tension 75 more than ﹪.
2.5.4 will reach three elements (1) percentage elongation after capillary finished product and reach 8 ﹪, tension reaches 98 ﹪. (2) pressurize 15 kilograms of leak-free pressure.(3) same units length flow is consistent.
Below part of the present invention bad pipe drawing technique drawing result, unit mm:
| Sequence number | Measure internal diameter | Error | Result |
| 1 | 12.82 | 0.02 | Qualified |
| 2 | 12.86 | 0.06 | Defective |
| 3 | 12.83 | 0.03 | Qualified |
| 4 | 12.81 | 0.01 | Qualified |
| 5 | 12.82 | 0.02 | Qualified |
| 6 | 12.82 | 0.02 | Qualified |
| 7 | 12.83 | 0.03 | Qualified |
| 8 | 12.81 | 0.01 | Qualified |
Utilize above table statistics, present invention process capillary yields is more than 95%.
The capillary of aluminium matter of the present invention is compared copper capillary cost and is only had its three point, so economic benefit improves a lot relatively, calculates 1 year cost-saved about 100,000,000 with national output 8,000 ten thousand production capacity.
Above, be only the embodiment utilizing this origination techniques content, the modification that any those skilled in the art use this creation to do, change, all belong to the scope of the claims that this creation is advocated, and be not limited to those disclosed embodiments.
Claims (9)
1. a refrigeration system aluminium capillary preparation method, it is characterized in that: adopt cold drawn technology to draw aluminum base pipe, drawing mould is adopted during drawing, the core rod that this mould comprises external mold and matches, core rod wherein has core print sizing portion, the drawing power of aluminum base pipe increases with the fixed length through portion of core print and increases, and travelling core rod carries out dish throwing pipe, forms refrigeration system aluminium capillary.
2. refrigeration system aluminium capillary preparation method according to claim 1, it is characterized in that: described core rod also has middle circle tapering and core tail cylindrical portion, core print sizing minister degree is determined by following formula:
Unit mm;
Wherein D is core tail body diameter, unit mm,
D is that core print is fixed through portion's body diameter, unit mm,
F is coefficient of friction between base pipe and core print, f=0.10 ~ 0.12,
L1 is middle circle tapering length, unit mm;
u＝4～6。
3. refrigeration system aluminium capillary preparation method according to claim 1, is characterized in that: described aluminum base pipe draws power to be increased by the fixed length through portion of core print increases, and be in line relation.
4. refrigeration system aluminium capillary preparation method according to claim 1, it is characterized in that: described external mold has the deformed area in tapering, core rod all the time in deformed area aluminum base pipe draw and just can play tube reducing and subtract wall, the tapering α of external mold deformed area is greater than the tapering β of core rod, and both tapering differences are no more than 3 degree.
5. refrigeration system aluminium capillary preparation method according to claim 4, it is characterized in that: described external mold tapering α=12 degree, core rod tapering β=9 degree, the pulling force of aluminum base pipe is minimum, and good stability draws tubule not easily to break.
6. refrigeration system aluminium capillary preparation method according to claim 1, is characterized in that: aluminum base pipe draws shaping through multi-pass, and every time draft is at 50%-65%, and wall cut rate is at 18.3%-23.8%, and drawing speed is at 25-35n/min.
7. refrigeration system aluminium capillary preparation method according to claim 1, it is characterized in that: when aluminum base pipe draws, in pipe, inject lubricating oil, ensure core rod energy sufficient lubrication in drawing process, and retaining hole is being beaten apart from certain length place, termination, prevent core back, make mold core head enter deformed area formation lining smoothly and draw.
8. refrigeration system aluminium capillary preparation method according to claim 1, is characterized in that: described aluminum base thickness of pipe wall is even, and deviation can not be greater than 0.08-0.13 ㎜; Base pipe percentage elongation must reach 55 more than ﹪, tension 75 more than ﹪.
9., according to the refrigeration system aluminium capillary preparation method one of claim 1 to 8 Suo Shu, it is characterized in that: after aluminium capillary finished product, external diameter is at ￠ 3.0 below ㎜, and its percentage elongation reaches 8 more than ﹪, and tension reaches 98 more than ﹪.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 stainless steel capillary processing technology |
| 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 |
| 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 |
| 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 |
| 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 |
| CN112384313A (en) * | 2018-07-05 | 2021-02-19 | 费罗伦股份公司 | Continuous process for producing non-ferrous alloy prepared capillaries |
| CN116274447A (en) * | 2023-03-06 | 2023-06-23 | 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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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 stainless steel capillary processing technology |
| 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 |
| CN112384313A (en) * | 2018-07-05 | 2021-02-19 | 费罗伦股份公司 | Continuous process for producing non-ferrous alloy prepared capillaries |
| US11717870B2 (en) | 2018-07-05 | 2023-08-08 | Feinrohren S.P.A. | Continuous method for producing capillaries made of nonferrous 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 |
| CN116274447A (en) * | 2023-03-06 | 2023-06-23 | 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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