CN104874638A - 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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- CN104874638A CN104874638A CN201510345935.8A CN201510345935A CN104874638A CN 104874638 A CN104874638 A CN 104874638A CN 201510345935 A CN201510345935 A CN 201510345935A CN 104874638 A CN104874638 A CN 104874638A
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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 technology of copper pipe, specifically a kind of manufacturing process waiting wall thickness reducing copper pipe.
Background technology
At present, transmit cold-producing medium between air-conditioning equipment unit by metal connecting tube as air-conditioner pipe, traditional air-conditioner pipe is equal pipe, when mounted because needs are through walls or bent angle, this air-conditioner pipe is easily out of shape because of bending, causes tube refrigerant to circulate smooth, air-conditioner pipe shortening in service life.In order to solve the problem and adapt to the needs of the inner diverse location of unit or modular construction, the reducing air-conditioner pipe that caliber has thickness to change can be used.
Reducing air-conditioner pipe common is at present all made by the expansion warp of routine and undergauge manufacturing process, the Material compression caused due to the expander draw and stretching, the reducing air-conditioner pipe pipe wall thickness everywhere processed is inconsistent, cause reducing air-conditioner pipe compressive resistance everywhere inconsistent, make that the withstand voltage properties of air-conditioner pipe entirety reduces, stock utilization declines, wall thickness thin location is easily out of shape, even easily rupture and leakage, the inconsistent of wall thickness also result in the inconsistent of internal diameter, make the flow of cold-producing medium, flow velocity uneven, be unfavorable for the long stable operation of unit.For solving above-mentioned reducing air-conditioner pipe Problems existing, need the wall thickness of increase air-conditioner pipe entirety or utilize the pipe of many uniform thickness to connect to make.The increase of wall thickness can make production cost significantly increase, and the utilization rate of material is also lower, and the increase of wall thickness makes air-conditioner pipe be difficult to bend, and during installation, difficulty is larger; The form of many tube combinations then adds solder joint, reduces bulk strength, easily leaks at the place of being welded to connect.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, propose a kind of manufacturing process waiting wall thickness reducing copper pipe.
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; expansion warp is carried out to the end at two ends; process two extension diameter sections; expand copper pipe End clamping protective in process; axially be pushed into copper pipe with plug from copper pipe two ends ecto-entad; in the process that plug pushes, copper pipe End is heated, and ecto-entad axially promotes the end of copper pipe.
3rd step: carry out annular knurl process to extension diameter section, makes its surface form corrugated helicla flute.
4th step: extension diameter section outer end is carried out reducing and undergauge process to design caliber size, form the mouth of pipe section of straight tube-like, mouth of pipe section processes screw thread.
Wherein, the speed promoting copper pipe End in second step is 10-55cm/ minute, and promotion applied pressure is 50-250kg, and the temperature controlling copper pipe is 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, in copper pipe stage casing, coaxially fill in supporter in undergauge process, and first overlap in the one end in copper pipe stage casing and load onto mould, copper pipe suppresses an annular recess, then the other end being pushed into the axial copper pipe stage casing of mould moves, and copper pipe tube wall is inwardly attached on supporter.
Preferably, be pushed in the process of mould movement, utilize the first auxiliary clamp to fix copper pipe, and pull copper pipe to the opposite direction of mould moving direction.
Preferably, described mould inwall is same circumferentially arranges multiple pressure roller, described mould along while copper pipe movement, with copper pipe tubular axis for the heart rotates; Described supporter is spherical, and supporter aligns with mould and synchronizing moving.
Preferably, when being fixed by copper pipe in second step, install the second auxiliary clamp in the middle part of copper pipe, the outer ledge of the second auxiliary clamp is stuck on the reducer that formed between undergauge section and extension diameter section.
Preferably, the translational speed of described mould is 10-65cm/ minute.
Preferably, when carrying out expanding to copper pipe End in second step, repeatedly fill in plug, and the protective that clamping is corresponding with plug, the external diameter of the plug at every turn filled in increases gradually.
The invention has the beneficial effects as follows: what this method was made waits wall thickness reducing copper pipe to be formed in one, stock utilization is high, cost is low, expand through promoting pipe simultaneously, wall thickness is moderate and consistent everywhere to make pipe, is easy to bending, install easily, pipe everywhere compressive resistance is consistent, and the withstand voltage properties of pipe integral is balanced and comparatively strong, not easily leaks; The internal diameter of pipeline can keep even, makes flow velocity and the uniform flow of tube refrigerant, and air-conditioner set can long-time stable work.
Expand premenstrual to stage casing undergauge, the diametric requirements of local can be met, form channel-shaped structure simultaneously, be convenient to the fixing of pipe, be conducive to the carrying out of expander operation, effectively avoid the permitted maximum range of the draw or expander, also can according to processing request, adopt thicker copper pipe to start to process as raw material, improve the flexibility manufactured.Undergauge utilizes mould to move to the other end from one end to exert pressure and carry out, and makes the metal material piled up due to undergauge be more prone to scatter, keep the uniform wall thickness of copper pipe diameter shrinkage part consistent.Mould arranges pressure roller, and adopt and rotate roll-in, the operation of copper pipe undergauge is more prone to, and supporter is spherical, just with from copper pipe takes out after copper pipe undergauge.
Expanding through adopting multiple plugs of increasing gradually of external diameter to carry out step by step, avoiding ips to change excessive, the speed making promotion pipe can mate the material owing to expanding through causing to reduce, enables material compensate in time, ensures that the uniform wall thickness of copper pipe extension diameter section is consistent.Expand through time clamping protective used and undergauge time supporter used, for expand through, undergauge time coordinate corresponding plug, mould controls the thickness of pipe, also pipe is played a supporting role, improves stability during tube to tubesheet.
Accompanying drawing explanation
Accompanying drawing 1 be manufacturing process of the present invention to copper pipe one end expand through time copper pipe structure cross-sectional schematic;
Accompanying drawing 2 is copper pipe structure cross-sectional schematic one when manufacturing process of the present invention carries out undergauge to copper pipe;
Accompanying drawing 3 is copper pipe structure cross-sectional schematic two when manufacturing process of the present invention carries out undergauge to copper pipe.
Detailed description of the invention
The manufacturing process waiting wall thickness reducer pipe of the present invention, as shown in Fig. 1 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, by fixing in the middle part of copper pipe 1, carry out expansion warp to the end at two ends, processes two extension diameter sections 2.Expand copper pipe End clamping protective 3 in process; with plug 4 from copper pipe 1 two ends ecto-entad with thrust F2; axially be pushed in copper pipe 1; in the process that plug 4 pushes, 60-240 DEG C is heated to copper pipe 1 end; and ecto-entad is axially with the fltting speed of the thrust F1 of 50-250kg and 10-55cm/ minute, promote the end of copper pipe 1.Expand through for repeatedly to expand warp step by step, repeatedly in the extension diameter section of copper pipe 1, fill in plug 4, and the protective 3 that clamping is corresponding with plug 4, the external diameter of the plug 4 at every turn filled in increases gradually, makes caliber become large gradually.
3rd step: carry out annular knurl process to extension diameter section 2, makes its surface form corrugated helicla flute.
4th step: extension diameter section 2 outer end is carried out reducing and undergauge process to design caliber size, form the mouth of pipe section of straight tube-like, mouth of pipe section processes screw thread, manufacture the required reducing air-conditioner pipe waiting wall thickness.By screw thread, the mouth of pipe Duan Keyu miscellaneous part formed through shell nosing treatment connects.
For the selection of the requirement and copper pipe raw material of tackling some casts, before carrying out second step, undergauge to be carried out to copper pipe 1 stage casing, process one section of undergauge section 5.As shown in Figure 2, in undergauge process, in copper pipe 1 stage casing, coaxially fill in supporter 6, and first overlap in the one end in copper pipe 1 stage casing and load onto mould 7, copper pipe 1 suppresses an annular recess, as starting point.Then as shown in Figure 3, the other end being pushed into mould 7 axial copper pipe 1 stage casing with the speed of thrust F3 and 10-65cm/ minute moves.Be pushed in the process of mould 7 movement, the first auxiliary clamp 9 is utilized to fix copper pipe 1, and pull copper pipe 1 with the pulling force of F4 to the opposite direction of mould 7 moving direction, mould 7 inwall is same circumferentially arranges multiple pressure roller 8, mould 7 is along while copper pipe 1 movement, rotate for the heart with copper pipe 1 tubular axis, copper pipe 1 tube wall is inwardly attached on supporter 6, completes undergauge.
Supporter 6 is spherical, and supporter 6 aligns with mould 7 and synchronizing moving, and supporter 6 moves along copper pipe 1 tubular axis, coordinates with mould 7, copper pipe 1 tube wall is inwardly attached on supporter 6, and controls the copper pipe thickness of pipe.
After having carried out undergauge, then carry out by when fixing in the middle part of copper pipe in second step, the outer ledge installing the second auxiliary clamp 8, second auxiliary clamp 8 in the middle part of copper pipe is stuck on the reducer of formation between undergauge section 5 and extension diameter section 2.
Claims (7)
1. wait a manufacturing process for wall thickness reducing copper pipe, it is characterized 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, expansion warp is carried out to the end at two ends, process two extension diameter sections, expand copper pipe End clamping protective in process, axially be pushed into copper pipe with plug from copper pipe two ends ecto-entad, in the process that plug pushes, copper pipe End is heated, and ecto-entad axially promotes the end of copper pipe;
3rd step: carry out annular knurl process to extension diameter section, makes its surface form corrugated helicla flute;
4th step: extension diameter section outer end is carried out reducing and undergauge process to design caliber size, form the mouth of pipe section of straight tube-like, mouth of pipe section processes screw thread;
Wherein, the speed promoting copper pipe End in second step is 10-55cm/ minute, and promotion applied pressure is 50-250kg, and the temperature controlling copper pipe is 60-240 DEG C.
2. the manufacturing process waiting wall thickness reducing copper pipe according to claim 1, it is characterized in that, before carrying out second step, undergauge is carried out to copper pipe stage casing, processes one section of undergauge section, in undergauge process, in copper pipe stage casing, coaxially fill in supporter, and first overlap in the one end in copper pipe stage casing and load onto mould, copper pipe suppresses an annular recess, and the other end being then pushed into the axial copper pipe stage casing of mould moves, and copper pipe tube wall is inwardly attached on supporter.
3. the manufacturing process waiting wall thickness reducing copper pipe according to claim 2, is characterized in that, be pushed in the process of mould movement, utilize the first auxiliary clamp to fix copper pipe, 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, it is characterized in that, described mould inwall is same circumferentially arranges multiple pressure roller, described mould along while copper pipe movement, with copper pipe tubular axis for the heart rotates; Described supporter is spherical, and supporter aligns with mould and synchronizing moving.
5. the manufacturing process waiting wall thickness reducing copper pipe according to claim 2, it is characterized in that, when being fixed by copper pipe in second step, install the second auxiliary clamp in the middle part of copper pipe, the outer ledge of the second auxiliary clamp is stuck on the reducer that formed between undergauge section and extension diameter section.
6. the manufacturing process waiting wall thickness reducing copper pipe according to claim 2, it is characterized in that, the translational speed of described mould is 10-65cm/ minute.
7. the manufacturing process waiting wall thickness reducing copper pipe according to claim 1, is characterized in that, when carrying out expanding to copper pipe End in second step, repeatedly fill in plug, and the protective that clamping is corresponding with plug, the external diameter of the plug at every turn filled in increases gradually.
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 |
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| 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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| CN104874638A true CN104874638A (en) | 2015-09-02 |
| CN104874638B 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222783A (en) * | 2020-10-12 | 2021-01-15 | 佛山市顺德区捷永电器实业有限公司 | Novel enthalpy-increasing pipe integrated processing method |
| CN112475074A (en) * | 2020-12-04 | 2021-03-12 | 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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| JPS51112471A (en) * | 1976-03-08 | 1976-10-04 | Suguru Shimabayashi | Method of forming metal pipe with different diameter section |
| US4649728A (en) * | 1985-04-23 | 1987-03-17 | The Babcock & Wilcox Company | Integral joint forming of work-hardenable high alloy tubing |
| JPH07164067A (en) * | 1993-12-13 | 1995-06-27 | Sango Co Ltd | Manufacture of pipe with uneven thickness |
| JPH07214148A (en) * | 1994-02-03 | 1995-08-15 | Sango Co Ltd | Method for thickening metallic pipe |
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| 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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2015
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS51112471A (en) * | 1976-03-08 | 1976-10-04 | Suguru Shimabayashi | Method of forming metal pipe with different diameter section |
| US4649728A (en) * | 1985-04-23 | 1987-03-17 | The Babcock & Wilcox Company | Integral joint forming of work-hardenable high alloy tubing |
| JPH07164067A (en) * | 1993-12-13 | 1995-06-27 | Sango Co Ltd | Manufacture of pipe with uneven thickness |
| JPH07214148A (en) * | 1994-02-03 | 1995-08-15 | Sango Co Ltd | Method for thickening metallic pipe |
| CN1195306A (en) * | 1995-09-07 | 1998-10-07 | 狄纳米特诺贝尔爆炸材料和系统技术股份有限公司 | Method and device for producing pressure-rolled pipes with thickened inner wall sections at ends |
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| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222783A (en) * | 2020-10-12 | 2021-01-15 | 佛山市顺德区捷永电器实业有限公司 | Novel enthalpy-increasing pipe integrated processing method |
| CN112475074A (en) * | 2020-12-04 | 2021-03-12 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104874638B (en) | 2017-01-18 |
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