CN104307899A - Process for machining special pipe - Google Patents
Process for machining special pipe Download PDFInfo
- Publication number
- CN104307899A CN104307899A CN201410638780.2A CN201410638780A CN104307899A CN 104307899 A CN104307899 A CN 104307899A CN 201410638780 A CN201410638780 A CN 201410638780A CN 104307899 A CN104307899 A CN 104307899A
- Authority
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- China
- Prior art keywords
- core print
- special pipe
- processing technique
- pipe processing
- mold
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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
-
- 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
- B21C3/02—Dies; Selection of material therefor; Cleaning thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention provides a process for machining a special pipe. The method comprises the following steps: 1) extrusion and preforming of a roller, to be specific, selecting a hard round-straight copper pipe with an appropriate dimension parameter as a special pipe blank to be machined, and extruding and preforming the special pipe blank by using the roller so as to obtain a primarily machined blank; 2) one-step drawing formation, to be specific, putting the primarily machined blank into a drawing mold and obtaining the formed pipe after one-time drawing. The drawing mold comprises an outer mold and a core print, wherein the outer mold comprises a mold sleeve and a mold core; a cavity is formed in the mold sleeve; the mold core is clamped in the mold sleeve; a cavity is formed in the mold core; the core print is arranged in the cavity of the mold core; a drawing passage for drawing the pipe is formed between the mold core and the core print. The process for machining the special pipe, provided by the invention, has the advantages of higher machining process efficiency, better product stability and better appearance effect of the formed copper pipe; meanwhile, the rate of finished products is also increased and the product machining difficulty is reduced.
Description
Technical field
Invention describes a kind of processing method of copper pipe, especially a kind of special pipe processing technique for wall-hung boiler, belongs to mechanical part processing technique field.
Background technology
Wall-hung boiler has another name called burnt gas wall hanging furnace, it is using natural gas, artificial coal gas or liquefied gas as fuel, fuel exports through burner, after the combustion of combustion chamber, by heat exchanger by heat absorption, the recirculated water in heating system when by way of heat exchanger, through heating in reciprocating mode, thus constantly heat is exported to building, for building provides thermal source.In the heat exchanger of wall-hung boiler, normally adopt copper pipe as the medium of heat exchange, the copper pipe used in conventional heat exchanger is mostly pipe, the copper pipe of this shape is in heating process, due to bottom from flare more close to, the temperature therefore bottom copper pipe will apparently higher than the temperature at top, this creates the terminal uneven situation of being heated, the heat that in corresponding copper pipe, the water in top portion absorbs is just on the low side, makes the efficiency of heat exchange not high like this.For addressing this problem, people improve the heat absorption efficiency of copper pipe by the cross sectional shape changing copper pipe, and therefore shape tube arises at the historic moment.Because the shape of shape tube is relatively special, the processing technology therefore when making is also different from typical circular copper pipe.Such as, publication number is that the Chinese patent of CN101773944 discloses one " moulding process of precision shaped pipe and cold drawing mold thereof ", and it adopts processing of first being annealed by round billet pipe, then through overpickling and phosphorating treatment, and then the mode that cold drawing is shaping.But this processing mode exists the lower problem of working (machining) efficiency, it needs to adopt soft state pipe to be used as the basis of drawing, therefore must the flow process of annealed processing, which results in process complications; And it needs through drawing operation repeatedly at drawing process, the shape needed for could being formed, and in the process of repeatedly drawing, product is easily out of shape, this can cause the qualification rate of finished product relatively low.
Summary of the invention
For above-mentioned deficiency of the prior art, main purpose of the present invention is to solve the copper pipe problem that working (machining) efficiency is lower and processing technology is more complicated when making used in existing current wall-hung boiler, and introduces that a kind of working (machining) efficiency is higher, the relatively simple special pipe processing technique of processing technology.
Technical scheme of the present invention: a kind of special pipe processing technique, is characterized in that, comprises the steps:
1) running roller extruding preformed: select the hard state circle straight copper tube of suitable dimension parameter as shape tube blank to be processed, shape tube blank running roller extruding preformed is obtained preliminary working blank;
2) drawing is shaping: preliminary working blank is put into drawing die, after a drawing, obtain shaping tubing.
The present invention is the processing technology adopted for making wall-hung boiler copper pipe used specially, it be in order to solve now current when making the copper pipe of this model the problem of the less stable of product after the too complicated and processing of technological process, by more direct effective processing mode, product can be obtained more efficiently, the stability of product size can also be improved simultaneously.In the present invention, have employed the copper pipe of hard state especially as blank, this is very important basis, its one side (with the difference of soft state copper pipe) does not need the step of processing of annealing, and also has good dimensional stability on the other hand, on this basis, technique of the present invention only need adopt a drawing and plastic, in this and traditional handicraft mode, repeatedly drawing shapingly could define distinct difference, has saved a large amount of time, has improve the efficiency manufactured.
Optimally, described drawing die comprises external mold and core print, and described external mold is made up of die sleeve and core rod, and in die sleeve, be provided with cavity, described core rod is connected in die sleeve; In core rod, be also provided with cavity, described core print is located in the cavity of core rod, between core rod and core print, form a drawing passage for drawing pipes.In the present invention, the drawing die adopted also be special for process of the present invention Aided design, it is specifically for the copper pipe processing of wall-hung boiler, therefore when designing mould, consider the parameter characteristic of hard state copper pipe, as hardness, thickness and toughness etc., such guarantee drawing and plastic, can not cause copper pipe surface again simultaneously and damage or scratch, its precision requirement is higher, if adopt the copper pipe of common soft state, mould that then cannot be above-mentioned with the present invention matches, easily cause and break and scratch, more cannot a drawing shaping.
Optimally, the cross section of described core print is ellipsoidal structure.Here core print designs to be drawn into oval pipe.Because elliptical tube has good aerodynamic characteristic, direction of flow is similar to streamlined, air can flow through smoothly from surface, the burble point of air-flow and pipe moves backward, reduces the whirlpool district after pipe, thus reduces air drag, compared with the pipe of same cross-sectional, girth increases 21%, and surface area increases 15%, and pipe internal thermal resistance reduces 20 ~ 30%; Elliptical tube can realize compact tube bundle structure, under identical exchange capability of heat, can reduce air cooler appearance and size more than 20%, saves and takes up an area space.The air drag of oval tube heat exchanger is about 50% of pipe heat exchanger.Under the equal conditions such as identical refrigerating capacity (heating capacity), identical air quantity, oval tube heat exchanger air drag is about 50% of corresponding circle heat exchange of heat pipe, so the air-conditioning box air transmitting power of application oval tube heat exchanger is about 50% of corresponding pipe, namely save energy consumption of electrical machinery about 50%.
Optimally, the cross section of described core print is decussate texture.Here core print designs to be drawn into cross pipe.In the present invention, the core head structure of other shapes can also be adopted, be made into difform tubing, so just make technique of the present invention can have the very large scope of application, the making demand of difformity tubing can be met.
Optimally, be provided with a locating hole at described core print center, described locating hole extends along the axis of core print.Here the object arranging locating hole is conveniently to position core print when mounted, is fixed on corresponding connecting rod by core print, makes core print can be in the center position of core rod.
Optimally, the inwall of described core rod is conical structure, is also provided with conical opening in one end of die sleeve, and the internal diameter inside described core rod is identical with the inside diameter of cone shaped opening on die sleeve.Adopt conical design to be for the ease of copper pipe is put into mould in the present invention, what it is such that copper pipe can be level and smooth proceeds in drawing passage, avoids producing between copper pipe and core rod and core print rubbing.
Optimally, vertical and horizontal on described core print infall is that circular arc seamlessly transits.Here the design that seamlessly transits remains streamlined preferably in order to make shaping copper pipe can have in corner, and both had good appearance, the dimensional stability of self is also better simultaneously.
Optimally, described core print is also connected with bolt relative on the other end termination of locating hole.On described core print, the effect of connecting bolt is the weight increasing core print end, simultaneously when installing core print, can also form protection to core print end; core print is avoided to be worn; even if there is friction to be also that bolt is worn, thus reach the object of protection core print, extend the mold use life-span.
Optimally, on described die sleeve, the outside diameter of cone shaped opening is greater than the internal diameter outside core rod.The object of such design is to produce the pressure inwardly shunk to the copper pipe entering drawing passage, reaching with this effect coordinating drawing.
Optimally, described die sleeve, core rod and core print all adopt carbide alloy to obtain.The mould of carbide alloy has better hardness, and wearability is also better, can reduce the damaged condition of the mould of operation repeatedly on a production line like this, extends the mold use life-span.
Relative to prior art, the present invention has following beneficial effect:
1, working (machining) efficiency is higher: special pipe processing technique of the present invention decreases annealing and the technological process such as pickling, phosphatization, first select the pipe of hard state as processing basis, then the mode of the rear drawing of directly extruding is taked, only need a drawing and plastic, the process time of each product can be shortened like this, improve working (machining) efficiency, and drive the improved efficiency of whole machining production line.
2, the stability of product is better: the present invention due to adopt hard state pipe based on component, relative to former used soft state pipe, dimensional stability after copper pipe pipe processing of the present invention is obviously better, not yielding, there is suitable working modulus, and the making demand of multiple difformity copper pipe can be met.
3, the copper pipe after shaping has good appearance, and the surface of copper pipe has streamlined preferably, and therefore overall heat absorption is more even, there will not be the problem of hot-spot.
4, improve yield rate, decrease the loss of raw material, because this reducing the waste of resource, reducing the cost of enterprise production and management.
5, reduce Product processing difficulty, owing to having suitable working modulus, therefore can control the full and uniform flowing of liquid copper water when making, to the shaping of copper pipe, there is good guarantee, and not easily occur the problem that ruptures or size is uneven.
Accompanying drawing explanation
Fig. 1 is the cast outer mold structure schematic diagram of drawing die in a kind of special pipe processing technique of the present invention.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is the structure sectional view of a kind of core print used in the present invention.
Fig. 4 is the structural representation after the another kind of core print and outer die combination used in the present invention.
Fig. 5 is the B-B sectional view of Fig. 4.
In figure, 1-external mold, 11-die sleeve, 12-core rod, 2-core print, 3-drawing passage, 4-locating hole, 5-bolt.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, a kind of special pipe processing technique, comprises the steps:
1) running roller extruding preformed: select the hard state circle straight copper tube of suitable dimension parameter as shape tube blank to be processed, shape tube blank running roller extruding preformed is obtained preliminary working blank.Here running roller is existing equipment, and it is the mode by adopting external force extruding, and the straight copper pipe of circle is squeezed into required shape, as ellipse.In extrusion process, need overall uniform stressed, could ensure that copper pipe does not produce fold and is scratched.
2) drawing is shaping: preliminary working blank is put into drawing die, after a drawing, obtain shaping tubing.Described drawing die comprises external mold 1 and core print 2, and described external mold 1 is made up of die sleeve 11 and core rod 12, and in die sleeve 11, be provided with cavity, described core rod 12 is connected in die sleeve 11; In core rod 12, be also provided with cavity, the cavity in core rod 12 is oval.Described core print 2 is located in the cavity of core rod 12, between core rod 12 and core print 2, form a drawing passage 3 for drawing pipes.Be provided with a locating hole 4 at described core print 2 center, described locating hole 4 extends along the axis of core print 2.Core print 2 can be fixed on supporting support bar by locating hole 4, make core print 2 can be placed on the center of core rod 12 accurately.Described core print 2 is also connected with bolt 5 relative on the other end termination of locating hole 4, core print 2 can be protected by bolt 5, the weight of core print 2 end can also be increased simultaneously, avoid core print 2 to be out of shape in process.In the present invention, described die sleeve 11, core rod 12 and core print 2 all adopt carbide alloy to obtain, and can strengthen hardness and the wearability of mould like this, extend the mold use life-span.
See Fig. 2, the inwall of described core rod 12 is conical structure, is also provided with conical opening in one end of die sleeve 11, and the internal diameter inside described core rod 12 is identical with the inside diameter of cone shaped opening on die sleeve 11.And in the openend of both sides, the outside diameter of cone shaped opening is greater than the internal diameter outside core rod 12 on described die sleeve 11, be convenient to feeding so more level and smooth, reduce friction and the collision of blank and mould.
See Fig. 1 and Fig. 2, the cross section of described core print 2 can be ellipsoidal structure, and the cross section of the tubing like this after drawing is shaping is ellipse.See Fig. 4 and Fig. 5, the cross section of described core print 2 is decussate texture, and infall vertical and horizontal on core print 2 is circular arc seamlessly transits, and the cross section of the tubing after the mould drawing of this structure is shaping is cross.Can see and be, be equipped with the mould core print of different pattern, just can produce difform tubing, to meet the tubing demand of diverse location on wall-hung boiler.Certainly, the mould core print in the present invention is also not limited only to ellipse and decussate texture, and according to the demand of tubing design, can also be other shapes, as polygon etc., its processing mode be all identical.
Special pipe processing technique operation of the present invention is very easy, and the properties of product obtained are more excellent, adopt technique of the present invention not only can save time and simple flow, can also improve the stability of product, outward appearance, have good market prospects.
It should be noted that, above embodiment is only in order to illustrate technical solution of the present invention but not restriction technologies scheme, although applicant is explained in detail the present invention with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, those amendments that technical solution of the present invention is carried out or equivalently to replace, aim and the scope of the technical program can not be departed from, all should be encompassed in the middle of the claims in the present invention scope.
Claims (10)
1. a special pipe processing technique, is characterized in that, comprises the steps:
1) running roller extruding preformed: select the hard state circle straight copper tube of suitable dimension parameter as shape tube blank to be processed, shape tube blank running roller extruding preformed is obtained preliminary working blank;
2) drawing is shaping: preliminary working blank is put into drawing die, after a drawing, obtain shaping tubing.
2. a kind of special pipe processing technique according to claim 1, it is characterized in that, described drawing die comprises external mold (1) and core print (2), described external mold (1) is made up of die sleeve (11) and core rod (12), in die sleeve (11), be provided with cavity, described core rod (12) is connected in die sleeve (11); In core rod (12), be also provided with cavity, described core print (2) is located in the cavity of core rod (12), between core rod (12) and core print (2), form a drawing passage (3) for drawing pipes.
3. a kind of special pipe processing technique according to claim 2, is characterized in that, the cross section of described core print (2) is ellipsoidal structure.
4. a kind of special pipe processing technique according to claim 2, is characterized in that, the cross section of described core print (2) is decussate texture.
5. a kind of special pipe processing technique according to claim 2,3 or 4, is characterized in that, is provided with a locating hole (4) at described core print (2) center, and described locating hole (4) extends along the axis of core print (2).
6. a kind of special pipe processing technique according to claim 2, it is characterized in that, the inwall of described core rod (12) is conical structure, also be provided with conical opening in one end of die sleeve (11), the internal diameter of described core rod (12) inner side is identical with the inside diameter of the upper cone shaped opening of die sleeve (11).
7. a kind of special pipe processing technique according to claim 4, is characterized in that, the upper vertical and horizontal infall of described core print (2) is that circular arc seamlessly transits.
8. a kind of special pipe processing technique according to claim 5, is characterized in that, described core print (2) is also connected with bolt (5) relative on the other end termination of locating hole (4).
9. a kind of special pipe processing technique according to claim 6, is characterized in that, the outside diameter of the upper cone shaped opening of described die sleeve (11) is greater than the internal diameter in core rod (12) outside.
10. a kind of special pipe processing technique according to claim 6, is characterized in that, described die sleeve (11), core rod (12) and core print (2) all adopt carbide alloy to obtain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410638780.2A CN104307899B (en) | 2014-11-13 | 2014-11-13 | A kind of special pipe processing technique |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410638780.2A CN104307899B (en) | 2014-11-13 | 2014-11-13 | A kind of special pipe processing technique |
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| CN104307899A true CN104307899A (en) | 2015-01-28 |
| CN104307899B CN104307899B (en) | 2016-06-29 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772360A (en) * | 2015-03-31 | 2015-07-15 | 广东龙丰精密铜管有限公司 | Drawing outer die with highly hard work surface |
| CN105171357A (en) * | 2015-10-19 | 2015-12-23 | 河北欧通有色金属制品有限公司 | Machining method of D-shaped copper pipes and D-shaped copper pipes |
| CN106001144A (en) * | 2016-05-31 | 2016-10-12 | 宁波德创复冷机械有限公司 | Mold and device used for producing long splines and using method |
| CN107900124A (en) * | 2017-12-29 | 2018-04-13 | 重庆龙煜精密铜管有限公司 | Stretch external mold and again die drawing stretching process |
| CN107931349A (en) * | 2017-12-14 | 2018-04-20 | 上海龙阳精密复合铜管有限公司 | A kind of special-shaped plug die of new internal thread forming machine |
| CN108526232A (en) * | 2018-05-14 | 2018-09-14 | 重庆龙煜精密铜管有限公司 | Cross tee one-pass molding sky drawing-die has |
| CN110052545A (en) * | 2019-05-08 | 2019-07-26 | 重庆龙煜精密铜管有限公司 | A kind of large diameter copper pipe expansion drawing production technology |
| CN110899446A (en) * | 2019-11-27 | 2020-03-24 | 珠海蓝冠电子科技有限公司 | Cold forging and stretching method and die for charger shell |
| CN112474806A (en) * | 2020-12-21 | 2021-03-12 | 宁波金田铜管有限公司 | Preparation method of internal thread special-shaped copper pipe |
| CN112958642A (en) * | 2021-02-06 | 2021-06-15 | 重庆龙煜精密铜管有限公司 | Continuous drawing forming process for double-lug special pipe |
| CN113290066A (en) * | 2021-05-31 | 2021-08-24 | 重庆龙煜精密铜管有限公司 | Production process for stretched copper pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108126993A (en) * | 2017-12-22 | 2018-06-08 | 重庆龙煜精密铜管有限公司 | Ears specially shaped copper tube production technology |
| CN109848243B (en) * | 2018-12-06 | 2020-10-16 | 重庆龙煜精密铜管有限公司 | Process method for producing special-shaped copper pipe |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772360A (en) * | 2015-03-31 | 2015-07-15 | 广东龙丰精密铜管有限公司 | Drawing outer die with highly hard work surface |
| CN105171357A (en) * | 2015-10-19 | 2015-12-23 | 河北欧通有色金属制品有限公司 | Machining method of D-shaped copper pipes and D-shaped copper pipes |
| CN106001144A (en) * | 2016-05-31 | 2016-10-12 | 宁波德创复冷机械有限公司 | Mold and device used for producing long splines and using method |
| CN107931349A (en) * | 2017-12-14 | 2018-04-20 | 上海龙阳精密复合铜管有限公司 | A kind of special-shaped plug die of new internal thread forming machine |
| CN107900124A (en) * | 2017-12-29 | 2018-04-13 | 重庆龙煜精密铜管有限公司 | Stretch external mold and again die drawing stretching process |
| CN108526232B (en) * | 2018-05-14 | 2024-02-06 | 重庆龙煜精密铜管有限公司 | Cross pipe one-step forming blank drawing die |
| CN108526232A (en) * | 2018-05-14 | 2018-09-14 | 重庆龙煜精密铜管有限公司 | Cross tee one-pass molding sky drawing-die has |
| CN110052545A (en) * | 2019-05-08 | 2019-07-26 | 重庆龙煜精密铜管有限公司 | A kind of large diameter copper pipe expansion drawing production technology |
| CN110899446A (en) * | 2019-11-27 | 2020-03-24 | 珠海蓝冠电子科技有限公司 | Cold forging and stretching method and die for charger shell |
| CN112474806A (en) * | 2020-12-21 | 2021-03-12 | 宁波金田铜管有限公司 | Preparation method of internal thread special-shaped copper pipe |
| CN112474806B (en) * | 2020-12-21 | 2022-09-13 | 宁波金田铜管有限公司 | Preparation method of internal thread special-shaped copper pipe |
| CN112958642A (en) * | 2021-02-06 | 2021-06-15 | 重庆龙煜精密铜管有限公司 | Continuous drawing forming process for double-lug special pipe |
| CN113290066A (en) * | 2021-05-31 | 2021-08-24 | 重庆龙煜精密铜管有限公司 | Production process for stretched copper pipe |
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| CN104307899B (en) | 2016-06-29 |
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Denomination of invention: Process for machining special pipe Effective date of registration: 20171215 Granted publication date: 20160629 Pledgee: China Minsheng Banking Corp Zhengzhou branch Pledgor: Wuxi Golden Dragon Kawamura Precision Tube Co., Ltd.|Chongqing Longyu Precision Copper Tube Co., Ltd.|Henan Longhui Copper Industry Co., Ltd.|Xinxiang Jinxiang Precision Pipe Fittings Co., Ltd.|Xinxiang Longteng Refrigeration Technology Co.,Ltd.|Jiangsu Canghuan Copper Industry Co.,Ltd.|Jinlong Precision Copper Pipe Group Co., Ltd.|Guangdong Longfeng Precise Copper Tube Co., Ltd. Registration number: 2017990001045 |
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Denomination of invention: Process for machining special pipe Effective date of registration: 20190830 Granted publication date: 20160629 Pledgee: China Minsheng Banking Corp Zhengzhou branch Pledgor: Chongqing Longyu Precision Copper Tube Co., Ltd. Registration number: Y2019990000127 |