CN104874638B - Manufacturing process for equal wall thickness variable-diameter copper pipe - Google Patents
Manufacturing process for equal wall thickness variable-diameter copper pipe Download PDFInfo
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- CN104874638B CN104874638B CN201510345935.8A CN201510345935A CN104874638B CN 104874638 B CN104874638 B CN 104874638B CN 201510345935 A CN201510345935 A CN 201510345935A CN 104874638 B CN104874638 B CN 104874638B
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- copper pipe
- pipe
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- wall thickness
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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
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/16—Making tubes with varying diameter in longitudinal direction
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- Mechanical Engineering (AREA)
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- Metal Extraction Processes (AREA)
Abstract
The invention discloses a manufacturing process for an equal wall thickness variable-diameter copper pipe. The manufacturing process includes the steps that a section of copper pipe required by the design length is selected; the copper pipe is fixed, the diameters of the two ends of the copper pipe are expanded, two diameter-expanding sections are machined, protecting bodies are clamped at the ends of the copper pipe in the diameter expanding process, core rods are pushed into the copper pipe from outside to inside in the axial direction from the two ends of the copper pipe, the ends of the copper pipe are heated in the pushing-in process of the core rods, and the ends of the copper pipe are pushed in the axial direction from outside to inside; knurling treatment is conducted on the diameter-expanding sections, so that corrugated spiral grooves are formed in the surfaces of the diameter-expanding sections; the outer ends of the diameter-expanding sections are subjected to diameter changing and shrinking treatment to be in the designed pipe diameter size, straight-pipe-shaped pipe opening sections are formed, and threads are machined on the pipe opening sections. The equal wall thickness variable-diameter copper pipe manufactured through the method is integrally formed, the utilization rate of materials is high, the cost is low, the pipe is pushed while diameter expansion is conducted, the wall thicknesses of all the portions of the pipe are made moderate and consistent, bending and mounting are easy, the compression strengths of all the portions of the pipe are consistent, the overall pressure-resistant property of the pipe is balanced and high, and leakage is not likely to happen; the inner diameter of the pipe can be kept even, the flow velocity and the flow of refrigerating fluid in the pipe are made even, and therefore an air conditioning unit can work stably for a long time.
Description
Technical field
The present invention relates to a kind of processing technique of copper pipe, specifically a kind of manufacturing process waiting wall thickness reducing copper pipe.
Background technology
At present, between air-conditioning equipment unit, air-conditioner pipe is used as by metal connecting tube and transmits cold-producing medium, traditional air-conditioning
Manage as equal pipe, when mounted due to needing through walls or bent angle, this air-conditioner pipe easily deforms because of bending, causes to manage interior refrigeration
Agent circulation is not smooth, and air-conditioner pipe service life shortens.In order to solve the above problems and adapt to the internal diverse location of unit or part
The needs of structure, can use caliber has the reducing air-conditioner pipe of thickness change.
Reducing air-conditioner pipe common at present is all to be made by conventional expanding and undergauge manufacturing process, due to expander contracting
Material compression and stretching that pipe causes, the reducing air-conditioner pipe processing pipe wall thickness everywhere is inconsistent, leads to reducing air-conditioner pipe
Compressive resistance everywhere is inconsistent, and the pressure performance making air-conditioner pipe overall reduces, stock utilization declines, and wall thickness thin location is easy
Deformation, or even is easily broken leakage, and the inconsistent of wall thickness also result in the inconsistent of internal diameter, makes the flow of cold-producing medium, flow velocity not
Uniformly, it is unfavorable for the long stable operation of unit.For solving the problems, such as above-mentioned reducing air-conditioner pipe, need to increase air-conditioner pipe
Overall wall thickness or connected using the pipe of many uniform thickness is made.The increase of wall thickness can make production cost significantly increase, material
Utilization rate relatively low, and the increase of wall thickness makes air-conditioner pipe hardly be bent, and during installation, difficulty is larger；The shape of many tube combinations
Formula then increased solder joint, reduces bulk strength, is susceptible to leak at the place of being welded to connect.
Content of the invention
The present invention be directed to above-mentioned the deficiencies in the prior art it is proposed that a kind of wait wall thickness reducing copper pipe manufacturing process.
The manufacturing process waiting wall thickness reducing copper pipe of the present invention, step is as follows:
The first step: choose one section of copper pipe needed for design length.
Second step: copper pipe is fixed, the end at two ends is carried out expanding, process two extension diameter sections, expanding during copper
Tube end clamps protective, is axially pushed into copper pipe from copper pipe two ends ecto-entad with plug, plug is right during pushing
Copper pipe End is heated, and ecto-entad axially promotes the end of copper pipe.
3rd step: annular knurl process is carried out to extension diameter section so as to surface forms corrugated helicla flute.
4th step: extension diameter section outer end is carried out reducing and undergauge processes design caliber size, form the mouth of pipe of straight tube-like
Section, processes screw thread in mouth of pipe section.
Wherein, the speed promoting copper pipe End in second step is 10-55cm/ minute, promotes the pressure applying to be 50-
250kg, controls the temperature of copper pipe to be 60-240 DEG C.
Preferably, before carrying out second step, undergauge is carried out to copper pipe stage casing, process one section of undergauge section, undergauge process
In coaxially fill in supporter in copper pipe stage casing, and first cover in the one end in copper pipe stage casing and load onto mould, copper pipe is suppressed
Go out an annular recess, then promote mould axially to move to the other end in copper pipe stage casing, so that copper pipe tube wall is inwardly attached to
On supporter.
Preferably, during promoting mould mobile, fix copper pipe using the first auxiliary clamp, and to shaping mould
The opposite direction of tool moving direction pulls copper pipe.
Preferably, the same multiple pressure rollers provided circumferentially about of described mould inwall, described mould moves along copper pipe
While dynamic, rotated with copper pipe pipe axle for the heart；Described supporter is spherical, and supporter is alignd with mould and synchronizing moving.
Preferably, when will be fixing for copper pipe in second step, the second auxiliary clamp, the second auxiliary clamp be installed in the middle part of copper pipe
Outer ledge be stuck between undergauge section and extension diameter section formed reducer on.
Preferably, the translational speed of described mould is 10-65cm/ minute.
Preferably, when expanding being carried out to copper pipe End in second step, repeatedly fill in plug, and clamp corresponding with plug
Protective, the external diameter of the plug filled in every time is gradually increased.
The invention has the beneficial effects as follows: what this method was made waits wall thickness reducing copper pipe to be formed in one, and stock utilization is high,
Low cost, expanding promote pipe simultaneously, make pipe everywhere wall thickness moderate and consistent it is easy to bending, install easily, pipe is resistance to everywhere
Compressive Strength is consistent, the overall pressure balancing performance of pipe and relatively strong, is not susceptible to leak；The internal diameter of pipeline can keep uniform, makes
The flow velocity of tube refrigerant and uniform flow, air conditioning unit can long-time stable work.
Expanding front the diametric requirements of local can be met to stage casing undergauge, simultaneously formed groove-like structure, be easy to consolidating of pipe
Fixed, be conducive to the carrying out of expander operation, be effectively shielded from the permitted maximum range of the draw or expander, also can according to processing request,
Processing is proceeded by as raw material using thicker copper pipe, improves the motility manufacturing.Undergauge is to be moved from one end using mould
Carry out to other end pressure, make the metal material piled up due to undergauge be more prone to scatter, keep the wall of copper pipe diameter shrinkage part
Thick uniformity.Mould arranges pressure roller, and using rotation roll-in, copper pipe undergauge operation is more prone to, and supporter is spherical,
It is easy to after copper pipe undergauge take out from copper pipe.
Expanding carried out step by step using multiple plugs that external diameter is gradually increased, it is to avoid ips change is excessive, makes promotion pipe
Son can mate the speed reducing due to the expanding material causing, and so that material is compensated in time it is ensured that the wall of copper pipe extension diameter section
Thick uniformity.Clamping protective used and supporter used during undergauge when expanding, correspond to for cooperation during expanding, undergauge
Plug, mould the thickness of pipe is controlled, also pipe is played a supporting role, improves stability during tube to tubesheet.
Brief description
The structure cross-sectional schematic of copper pipe when accompanying drawing 1 carries out expanding for the manufacturing process of the present invention to copper pipe one end；
Accompanying drawing 2 is that the manufacturing process of the present invention carries out copper pipe structure cross-sectional schematic one during undergauge to copper pipe；
Accompanying drawing 3 is that the manufacturing process of the present invention carries out copper pipe structure cross-sectional schematic two during undergauge to copper pipe.
Specific embodiment
The manufacturing process waiting wall thickness reducer pipe of the present invention, as shown in Fig. 1 is to 2, comprises the steps:
The first step: choose one section of copper pipe 1 needed for design length.
Second step: as shown in figure 1, will be fixing for copper pipe 1 middle part, the end at two ends be carried out expanding, process two expanding
Section 2.During expanding, copper pipe End clamping protective 3, with plug 4 from copper pipe 1 two ends ecto-entad with thrust f2, axially pushes
To in copper pipe 1, plug 4 carries out being heated to 60-240 DEG C to copper pipe 1 end during pushing, and ecto-entad is axially with 50-
Thrust f1 of 250kg and the fltting speed of 10-55cm/ minute, promote the end of copper pipe 1.Expanding for repeatedly expanding step by step, many
Fill in plug 4 in the secondary extension diameter section to copper pipe 1, and clamp protective 3 corresponding with plug 4, the external diameter of the plug 4 filled in every time
It is gradually increased, so that caliber is become larger.
3rd step: annular knurl process is carried out so as to surface forms corrugated helicla flute to extension diameter section 2.
4th step: extension diameter section 2 outer end is carried out reducing and undergauge processes design caliber size, form the mouth of pipe of straight tube-like
Section, processes screw thread in mouth of pipe section, is manufactured into the required reducing air-conditioner pipe waiting wall thickness.By screw thread, through shell nosing treatment
And the mouth of pipe Duan Keyu miscellaneous part being formed is attached.
For tackling the requirement of some casts and the selection of copper pipe raw material, before carrying out second step, copper pipe 1 stage casing be entered
Row undergauge, processes one section of undergauge section 5.As shown in Fig. 2 coaxially filling in supporter 6 in copper pipe 1 stage casing during undergauge, and
First cover in the one end in copper pipe 1 stage casing and load onto mould 7, an annular recess is suppressed on copper pipe 1, as starting point.So
Afterwards as shown in figure 3, promoting mould 7 axially another to copper pipe 1 stage casing with the speed of thrust f3 and 10-65cm/ minute
End is moved.During promoting mould 7 mobile, fix copper pipe 1 using the first auxiliary clamp 9, and with the pulling force of f4 to one-tenth
The opposite direction that pattern has 7 moving directions pulls copper pipe 1, the same multiple pressure rollers 8 provided circumferentially about of mould 7 inwall, shaping mould
Tool 7, along while copper pipe 1 movement, is rotated for the heart with copper pipe 1 pipe axle, so that copper pipe 1 tube wall is inwardly attached on supporter 6, completes to contract
Footpath.
Supporter 6 is spherical, and supporter 6 is alignd with mould 7 and synchronizing moving, and supporter 6 moves along copper pipe 1 pipe axle
Dynamic, coordinate with mould 7, so that copper pipe 1 tube wall is inwardly attached on supporter 6, and the copper pipe thickness of pipe is controlled.
After having carried out undergauge, then when carrying out fixing in the middle part of copper pipe in second step, the second additional lock is installed in the middle part of copper pipe
Tool 10, the outer ledge of the second auxiliary clamp 10 is stuck on the reducer formed between undergauge section 5 and extension diameter section 2.
Claims (7)
1. a kind of manufacturing process waiting wall thickness reducing copper pipe is it is characterised in that step is as follows:
The first step: choose one section of copper pipe needed for design length；
Second step: copper pipe is fixed, the end at two ends is carried out expanding, process two extension diameter sections, expanding during copper pipe end
Portion clamp protective, be axially pushed into copper pipe from copper pipe two ends ecto-entad with plug, plug push during to copper pipe
End is heated, and ecto-entad axially promotes the end of copper pipe；
3rd step: annular knurl process is carried out to extension diameter section so as to surface forms corrugated helicla flute；
4th step: extension diameter section outer end is carried out reducing and undergauge processes design caliber size, form the mouth of pipe section of straight tube-like,
Screw thread is processed in mouth of pipe section；
Wherein, the speed promoting copper pipe End in second step is 10-55cm/ minute, promotes the pressure applying to be 50-250kg, control
The temperature of copper pipe processed is 60-240 DEG C.
2. before the manufacturing process of the wall thickness reducing copper pipe such as according to claim 1 is it is characterised in that carry out second step,
Undergauge is carried out to copper pipe stage casing, processes one section of undergauge section, during undergauge, in copper pipe stage casing, coaxially fill in supporter, and
The one end in copper pipe stage casing first covers loads onto mould, suppresses an annular recess on copper pipe, then promotes mould axle
Move to the other end in copper pipe stage casing, so that copper pipe tube wall is inwardly attached on supporter.
3. the manufacturing process waiting wall thickness reducing copper pipe according to claim 2 is it is characterised in that promote mould to move
During, fix copper pipe using the first auxiliary clamp, and pull copper pipe to the opposite direction of mould moving direction.
4. the manufacturing process waiting wall thickness reducing copper pipe according to claim 2 is it is characterised in that described mould inwall
Same multiple pressure rollers provided circumferentially about, described mould, along while copper pipe movement, is rotated with copper pipe pipe axle for the heart；Described
Support body is spherical, and supporter is alignd with mould and synchronizing moving.
5. the manufacturing process of grade wall thickness reducing copper pipe according to claim 2 is it is characterised in that consolidate copper pipe in second step
Regularly, the second auxiliary clamp is installed in the middle part of copper pipe, the outer ledge of the second auxiliary clamp is stuck between undergauge section and extension diameter section
On the reducer being formed.
6. the manufacturing process waiting wall thickness reducing copper pipe according to claim 2 is it is characterised in that the shifting of described mould
Dynamic speed is 10-65cm/ minute.
7. the manufacturing process waiting wall thickness reducing copper pipe according to claim 1 is it is characterised in that to copper pipe end in second step
When portion carries out expanding, repeatedly fill in plug, and clamp protective corresponding with plug, the external diameter of the plug filled in every time gradually increases
Greatly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510345935.8A CN104874638B (en) | 2015-06-19 | 2015-06-19 | Manufacturing process for equal wall thickness variable-diameter copper pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510345935.8A CN104874638B (en) | 2015-06-19 | 2015-06-19 | Manufacturing process for equal wall thickness variable-diameter copper pipe |
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| Publication Number | Publication Date |
|---|---|
| CN104874638A CN104874638A (en) | 2015-09-02 |
| CN104874638B true CN104874638B (en) | 2017-01-18 |
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| CN201510345935.8A Active CN104874638B (en) | 2015-06-19 | 2015-06-19 | Manufacturing process for equal wall thickness variable-diameter copper pipe |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222783B (en) * | 2020-10-12 | 2022-10-11 | 佛山市顺德区捷永电器实业有限公司 | Integrated processing method of enthalpy-increasing pipe |
| CN112475074B (en) * | 2020-12-04 | 2022-11-29 | 宁波天鑫金属软管有限公司 | Necking method of thin-wall pipe fitting and necking equipment applying same |
| CN114789217A (en) * | 2022-04-27 | 2022-07-26 | 广东轻量科技发展有限责任公司 | Automobile axle housing, automobile axle housing mold and forming method |
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| US4649728A (en) * | 1985-04-23 | 1987-03-17 | The Babcock & Wilcox Company | Integral joint forming of work-hardenable high alloy tubing |
| CN1195306A (en) * | 1995-09-07 | 1998-10-07 | 狄纳米特诺贝尔***材料和***技术股份有限公司 | Method and device for producing pressure-rolled pipes with thickened inner wall sections at ends |
| CN101298084A (en) * | 2008-07-03 | 2008-11-05 | 中铝洛阳铜业有限公司 | Technique for processing D type copper pipe with unequal-radius wall thickness or equal-radius wall thickness |
| CN103742730A (en) * | 2013-12-31 | 2014-04-23 | 左铁军 | Diameter-expanding different-diameter corrugated connecting pipe and production method thereof |
| CN104475481A (en) * | 2014-10-20 | 2015-04-01 | 重庆龙煜精密铜管有限公司 | A variable corrugated pipe producing process and a product thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51112471A (en) * | 1976-03-08 | 1976-10-04 | Suguru Shimabayashi | Method of forming metal pipe with different diameter section |
| JPH07164067A (en) * | 1993-12-13 | 1995-06-27 | Sango Co Ltd | Manufacture of pipe with uneven thickness |
| JP2719495B2 (en) * | 1994-02-03 | 1998-02-25 | 株式会社三五 | Metal tube thickening processing method |
| JP5198366B2 (en) * | 2009-06-17 | 2013-05-15 | 株式会社新三興鋼管 | Manufacturing method of steel pipe for threaded piping |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4649728A (en) * | 1985-04-23 | 1987-03-17 | The Babcock & Wilcox Company | Integral joint forming of work-hardenable high alloy tubing |
| CN1195306A (en) * | 1995-09-07 | 1998-10-07 | 狄纳米特诺贝尔***材料和***技术股份有限公司 | Method and device for producing pressure-rolled pipes with thickened inner wall sections at ends |
| CN101298084A (en) * | 2008-07-03 | 2008-11-05 | 中铝洛阳铜业有限公司 | Technique for processing D type copper pipe with unequal-radius wall thickness or equal-radius wall thickness |
| CN103742730A (en) * | 2013-12-31 | 2014-04-23 | 左铁军 | Diameter-expanding different-diameter corrugated connecting pipe and production method thereof |
| CN104475481A (en) * | 2014-10-20 | 2015-04-01 | 重庆龙煜精密铜管有限公司 | A variable corrugated pipe producing process and a product thereof |
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| CN104874638A (en) | 2015-09-02 |
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