CN105880440A - Cold rolling method of internal thread pipe - Google Patents
Cold rolling method of internal thread pipe Download PDFInfo
- Publication number
- CN105880440A CN105880440A CN201610330197.4A CN201610330197A CN105880440A CN 105880440 A CN105880440 A CN 105880440A CN 201610330197 A CN201610330197 A CN 201610330197A CN 105880440 A CN105880440 A CN 105880440A
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- section
- rolling
- hollow forging
- pipe
- cold rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/08—Making helical bodies or bodies having parts of helical shape internal screw-threads
Abstract
The invention relates to a cold rolling method of an internal thread pipe. The cold rolling method mainly comprises the steps that a billet pipe is fed into a cold rolling machine to be rolled, and meanwhile feeding-in of the billet pipe is kept; in the rolling process, metal flows into an internal thread groove of a core stick, the inner wall of the billet pipe gradually forms a plurality of thread lines from zero to one and from shallow to deeper, meanwhile, wall reduction and diameter reduction of the billet pipe happen, and the internal thread pipe is formed; in the process of rolling the internal thread pipe, the billet pipe rotates while feeding-in of the billet pipe is kept; in the feeding-in and rotating process of the billet pipe, a core stick rotates relative to the billet pipe, and the core stick is subject to derotation relative to the internal thread pipe; and the special internal thread core stick and a special outer mold are adopted, during pipe manufacturing, one-time rolling deformation amount is large, the number of cold rolling passes is reduced, and meanwhile it is ensured that the manufactured pipe has the excellent quality.
Description
Technical field
The present invention relates to a kind of tube rolling method, particularly relate to the cold rolling process of a kind of riffled tube.
Background technology
Riffled tube, as the term suggests being exactly the inwall metal tube with spiral bar line, is generally used for field of heat exchange.And in prior art, riffled tube all manufactures with cold-drawing method.Such as the Chinese invention patent application of Application No. 200510013531.5, it discloses the production method of a kind of cold-drawn riffled tube, it includes: a, mould according to conventional design cold-drawn riffled tube, including: external mold, core bar and the plug with spiral grooves；B, the plug of band spiral grooves and external mold use advanced laying method, i.e. by the external mold of core bar adjustment plug relative to position, make plug calibrating strap starting point deviate a calibrating strap initial point position to direction processed, and deviation distance numerical value is 0.5mm-3mm；C, carry out according to conventional method cold-drawn steel tube with internal thread draw shaping, obtain cold-drawn steel tube with internal thread finished product.Use the method, solve the problem that percent defective is high.But cold-drawn is constantly present problem, this relates to the forming principle of tubulation, and cold-drawn belongs to pulling method, and helix existence deviation the most more or less sets, and lead angle drawing is big, causes precision the highest.Cold rolling belong to extrusion, in the mobility of metal, in product quality, it is substantially better than cold-drawn, but the most problematic on manufacturing not do not solve, as interior screwed pipe when shaping with the chimeric lockout issue of internal thread plug, cause the current report also not having cold rolling riffled tube.
Summary of the invention
The invention solves the problems that the problems referred to above, thus the cold rolling process of a kind of riffled tube is provided.
The technical scheme that the present invention solves the problems referred to above is as follows:
The cold rolling process of riffled tube, comprises the following steps:
A, sending in cold-rolling mill by hollow forging, make hollow forging inwall be nested with on plug, hollow forging outer wall contacts with the annular groove of external mold, and makes hollow forging be sent into；
B, make the external mold of cold-rolling mill that hollow forging is carried out reciprocal rolling, made the tube wall generation metal flow of hollow forging by squeezing action；
C, the reciprocal rolling of continuation, in metal flows into the internal thread groove of plug, the inwall of hollow forging grows out of nothing and from the superficial to the deep gradually forms a plurality of threaded line, and hollow forging subtracts wall tube reducing simultaneously, forms riffled tube；
During rolling internal thread, while keeping hollow forging to be sent into, hollow forging is made to rotate；
During hollow forging is sent into and rotates, make plug turn round relative to described hollow forging, make described plug relative to the riffled tube generation derotation.
Preferred as technique scheme, described external mold is the external mold of two-roller mill.
Preferred as technique scheme, described plug is rhabodoid, includes the section of clamp-oning, rolling section and extruding zone that one is connected successively；The outer surface of described rolling section and described extruding zone is provided with thread-like groove, and the degree of depth of described thread-like groove is gradually deepened to described extruding zone by described rolling section；Described plug is on the direction of the described section of clamp-oning to described extruding zone, and the diameter of a circle that the outline of cross section is formed tapers into.
Preferred as technique scheme, it is curve that the diameter of a circle that the outline of described cross section is formed tapers into two long limits of the axial cross section so that described plug, i.e. from the described section of clamp-oning to described extruding zone, the speed that the diameter of a circle that the outline of cross section is formed diminishes is gradually reduced.
Preferred as technique scheme, two described long limits near described in the part of the section of clamp-oning be curve, the part near described extruding zone is straight line.
Preferred as technique scheme, described curve is a parabolical part.
Preferred as technique scheme, described in the section of clamp-oning one end of described rolling section is provided with installation portion.
Preferred as technique scheme, described installation portion for being provided with externally threaded rhabodoid, the diameter of the cross section of described installation portion be less than described in the diameter of cross section of the section of clamp-oning.
Preferred as technique scheme, described in the outer surface of the section of clamp-oning be shiny surface.
Preferred as technique scheme, described extruding zone includes rolling solid section near the screw thread deepened section of described rolling section and the screw thread away from described rolling section, and in described screw thread deepened section, the degree of depth of thread-like groove gradually deepens no longer to deepen until rolling solid section to described screw thread.
The method have the advantages that
1, the present invention uses special internal thread plug, during external mold rolling, the power that extruding produces acts on tube wall, the metal making tube wall flows, little by little it is flowed in the internal thread groove of plug, meanwhile, pipe is along with Mandrel Rotating thus solves the roundness problem of pipe, ultimately forms internal thread pipe；
2, after pipe has rolled, the internal thread of inner tubal wall occurs sealed with the internal thread groove of plug, it is impossible to be directly sent into by screwed pipe；The present invention uses the in time derotation so that plug is deviate from from closing component structure, and then realizes the feeding of screwed pipe, it is achieved the normal operation of whole operation；
3, the present invention uses special internal thread plug, and from the point of view of the axial section of this plug, its sideline is curvilinear structures, especially parabola, so designs, it is possible to realize being smoothed out of technique；At parabolical initial segment, its slope is relatively big, and then slope gradually diminishes, and this meets the metal pipe-wall characteristic when there is metal flow；For cold-rolling process, metal material itself has certain mobility, and the amount of rolling is the most, and the power required for rolling is the biggest, under normal circumstances, then along with the carrying out of rolling, the power needing roll to provide can be increasing, as being the cold rolling such as the pipe of inner wall smooth of routine, the flow direction of metal is only the direction of rolling, therefore, do not has the biggest problem, it is only necessary to Cold-rolling Parameters is suitably adjusted.And we be now to rolling be riffled tube, the flowing of metal is not only the direction of rolling, at least part metals to be tamped in the thread groove of internal thread mould, now, roll-force is broken down into the power of multiple directions, accordingly, it would be desirable to bigger power promotes the flowing of metal, as the most also used conventional shape, then rolling can be made to be difficult to.The present inventor, through repeatedly putting into practice, show that curvilinear plug can solve the conclusion of this problem.Curvilinear plug is equivalent to a cushioning effect, because it is difficult that the metal straight making flow forward switches through in the thread groove of curved inflow internal thread mould, but by the rectification of curve, gradient by curve, the metal making flow forward is first converted into oblique flowing, causes it to be easily pushed in the thread groove entering internal thread mould.It addition, the flowing that curve is metal in the rolling direction provides additional space, rolling is got up more laborsaving.Again due to, the degree of depth of the thread groove of internal thread mould is gradual change, it is smooth at the beginning, then thread groove starts appearance, the most then thread groove is gradually deepened, and last thread groove is molded, therefore, along with going deep into of rolling degree, the complexity that metal is pushed in the thread groove entering internal thread mould also occurs to change in the moment；So, use curve ratio to use oblique line to have superior technique effect.
Accompanying drawing explanation
Fig. 1 is the pipe-making method schematic diagram of the present invention；
Fig. 2 is the side view of Fig. 1；
Fig. 3 is the schematic diagram of internal thread plug of the present invention；
In figure, 1-hollow forging, 1 '-riffled tube, 2-plug, 3-external mold, 3-1-annular groove, the 21-section of clamp-oning, 22-rolls section, 23-extruding zone, 24-installation portion, 231-screw thread deepened section, and 232-screw thread rolls solid section.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be described in detail.
This detailed description of the invention is only explanation of the invention, is not limitation of the present invention.Any change that those skilled in the art are made after the specification having read the present invention, as long as in the range of claims, all will be protected by Patent Law.
As illustrated in fig. 1 and 2, this 2 cold rolling process illustrating riffled tube.In figure, 1 is hollow forging, and 1 ' is the riffled tube formed after the rolling of mould by hollow forging 1.Mould includes plug 2 and external mold 3.Plug 2 serves as a contrast in hollow forging 1, and external mold 3 includes that upper die and lower die, upper die and lower die pairing are arranged, and pipe is then in the annular groove 3-1 of upper die and lower die.Concrete grammar is as follows.
The cold rolling process of riffled tube, comprises the following steps:
A, sending in cold-rolling mill by hollow forging 1, make hollow forging inwall be nested with on plug 2, hollow forging outer wall contacts with the annular groove 3-1 of external mold 3, and makes hollow forging be sent into；
B, make the external mold 3 of cold-rolling mill that hollow forging is carried out reciprocal rolling, made the tube wall generation metal flow of hollow forging by squeezing action；
C, the reciprocal rolling of continuation, in metal flows into the internal thread groove of plug 2, the inwall of hollow forging grows out of nothing and from the superficial to the deep gradually forms a plurality of threaded line, and hollow forging subtracts wall tube reducing simultaneously, forms riffled tube 1 '；
During rolling internal thread, while keeping hollow forging 1 to be sent into, make hollow forging 1 rotate, thus solve the roundness problem of pipe；
During hollow forging 1 is sent into and rotates, make plug 2 turn round relative to described hollow forging 1, make described plug 2, relative to riffled tube 1 ', the derotation occur, thus solve the lockout issue of IPT and the internal thread groove of plug.
As it is shown on figure 3, plug 2 is rhabodoid described in described plug 2, include the section of clamp-oning 21, rolling section 22 and extruding zone 23 that one is connected successively；The outer surface of described rolling section 22 and described extruding zone 23 is provided with thread-like groove, and the degree of depth of described thread-like groove is gradually deepened to described extruding zone 23 by described rolling section 22；Described plug 2 is on the direction of the described section of clamp-oning 21 to described extruding zone 23, and the diameter of a circle that the outline of cross section is formed tapers into.It is curve that the diameter of a circle that the outline of described cross section is formed tapers into two long limits of the axial cross section so that described plug 2, i.e. it is gradually reduced to described extruding zone 23, the speed that the diameter of a circle that the outline of cross section is formed diminishes from the described section of clamp-oning 21.Described in two described long limits are close, a part for the section of clamp-oning 21 is curve, and the part near described extruding zone 23 is straight line.Described curve is a parabolical part.The described section of clamp-oning 21 is provided with installation portion 24 away from one end of described rolling section 22.Described installation portion 4 for being provided with externally threaded rhabodoid, the diameter of the cross section of described installation portion 4 be less than described in the diameter of cross section of the section of clamp-oning 1.The outer surface of the described section of clamp-oning 21 is shiny surface.Described extruding zone 23 includes rolling solid section 232 near the screw thread deepened section 231 of described rolling section 22 and the screw thread away from described rolling section 22, and in described screw thread deepened section 231, the degree of depth of thread-like groove gradually deepens no longer to deepen until rolling solid section 232 to described screw thread.
Claims (10)
1. the cold rolling process of riffled tube, comprises the following steps:
A, being sent in cold-rolling mill by hollow forging (1), make hollow forging inwall be nested with on plug (2), hollow forging outer wall contacts with the annular groove (3-1) of external mold (3), and makes hollow forging be sent into；
B, make the external mold (3) of cold-rolling mill that hollow forging is carried out reciprocal rolling, made the tube wall generation metal flow of hollow forging by squeezing action；
C, the reciprocal rolling of continuation, in metal flows into the internal thread groove of plug (2), the inwall of hollow forging grows out of nothing and from the superficial to the deep gradually forms a plurality of threaded line, and hollow forging subtracts wall tube reducing simultaneously, forms riffled tube (1 ')；
During rolling internal thread, while keeping hollow forging to be sent into, hollow forging is made to rotate；
During hollow forging is sent into and rotates, make plug (2) turn round relative to described hollow forging (1), make described plug (2), relative to riffled tube (1 '), the derotation occur.
The cold rolling process of riffled tube the most according to claim 1, it is characterised in that: described external mold (3) is the external mold (3) of two-roller mill.
The cold rolling process of riffled tube the most according to claim 1, it is characterised in that: described plug (2) is rhabodoid, includes the section of clamp-oning (21), rolling section (22) and extruding zone (23) that one is connected successively；The outer surface of described rolling section (22) and described extruding zone (23) is provided with thread-like groove, and the degree of depth of described thread-like groove is gradually deepened to described extruding zone (23) by described rolling section (22)；Described plug (2) is on the direction of the described section of clamp-oning (21) to described extruding zone (23), and the diameter of a circle that the outline of cross section is formed tapers into.
The cold rolling process of riffled tube the most according to claim 3, it is characterized in that: it is curve that the diameter of a circle that the outline of described cross section is formed tapers into two long limits of the axial cross section so that described plug (2), i.e. from the described section of clamp-oning (21) to described extruding zone (23), the speed that the diameter of a circle that the outline of cross section is formed diminishes is gradually reduced.
The cold rolling process of riffled tube the most according to claim 4, it is characterised in that: described in two described long limits are close, a part for the section of clamp-oning (21) is curve, and the part near described extruding zone (23) is straight line.
The cold rolling process of riffled tube the most according to claim 5, it is characterised in that: described curve is a parabolical part.
The cold rolling process of riffled tube the most according to claim 3, it is characterised in that the section of clamp-oning described in: (21) is provided with installation portion (24) away from one end of described rolling section (22).
The cold rolling process of riffled tube the most according to claim 7, it is characterised in that: described installation portion (4) for being provided with externally threaded rhabodoid, the diameter of the cross section of described installation portion (4) be less than described in the diameter of cross section of the section of clamp-oning (1).
The cold rolling process of riffled tube the most according to claim 3, it is characterised in that the outer surface of the section of clamp-oning described in: (21) is shiny surface.
The cold rolling process of riffled tube the most according to claim 3, it is characterized in that: described extruding zone (23) includes rolling solid section (232) near the screw thread deepened section (231) of described rolling section (22) and the screw thread away from described rolling section (22), and the degree of depth of the upper thread-like groove of described screw thread deepened section (231) gradually deepens no longer to deepen until rolling solid section (232) to described screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610330197.4A CN105880440B (en) | 2016-05-18 | 2016-05-18 | The cold rolling process of riffled tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610330197.4A CN105880440B (en) | 2016-05-18 | 2016-05-18 | The cold rolling process of riffled tube |
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| Publication Number | Publication Date |
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| CN105880440A true CN105880440A (en) | 2016-08-24 |
| CN105880440B CN105880440B (en) | 2018-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610330197.4A Active CN105880440B (en) | 2016-05-18 | 2016-05-18 | The cold rolling process of riffled tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108465701A (en) * | 2018-03-27 | 2018-08-31 | 常州市环华机械有限公司 | The cold rolling process of interior special pipe double roller mould for cold milling, processing method and interior special pipe |
| KR102431874B1 (en) * | 2022-01-13 | 2022-08-24 | 주식회사 크로스워커스 | a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same |
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| CN2207242Y (en) * | 1994-05-05 | 1995-09-13 | 刘�英 | Metal tube inner surface spiral groove shaping apparatus |
| JP2001510093A (en) * | 1997-07-19 | 2001-07-31 | デイナミート ノーベル ゲゼルシャフト ミット ベシュレンクテル ハフツング エクスプロジーフシュトッフ− ウント ジステームテヒニク | Apparatus and method for forming a groove structure in a tubular workpiece |
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| CN104759502A (en) * | 2015-03-17 | 2015-07-08 | 中国科学院金属研究所 | Processing method for aluminum or aluminum alloy pipe with thread inner tendon |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU1480944A1 (en) * | 1987-06-29 | 1989-05-23 | Челябинский Политехнический Институт Им.Ленинского Комсомола | Method of rolling articles with inner helical rings |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2207242Y (en) * | 1994-05-05 | 1995-09-13 | 刘�英 | Metal tube inner surface spiral groove shaping apparatus |
| JP2001510093A (en) * | 1997-07-19 | 2001-07-31 | デイナミート ノーベル ゲゼルシャフト ミット ベシュレンクテル ハフツング エクスプロジーフシュトッフ− ウント ジステームテヒニク | Apparatus and method for forming a groove structure in a tubular workpiece |
| DE10311144B3 (en) * | 2003-03-14 | 2004-10-28 | Sms Meer Gmbh | Method for producing a tube with an internal profile and device for carrying out the method |
| CN201558845U (en) * | 2009-05-10 | 2010-08-25 | 温州市金洛机械设备制造有限公司 | Cold rolling die suitable for special tube of double-roll cold rolled tube machine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108465701A (en) * | 2018-03-27 | 2018-08-31 | 常州市环华机械有限公司 | The cold rolling process of interior special pipe double roller mould for cold milling, processing method and interior special pipe |
| KR102431874B1 (en) * | 2022-01-13 | 2022-08-24 | 주식회사 크로스워커스 | a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same |
| KR20230109538A (en) * | 2022-01-13 | 2023-07-20 | 주식회사 크로스워커스 | a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same |
| KR102560256B1 (en) * | 2022-01-13 | 2023-07-28 | 주식회사 크로스워커스 | a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same |
| KR20230113717A (en) * | 2022-01-13 | 2023-08-01 | 주식회사 크로스워커스 | a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same |
| KR102624182B1 (en) | 2022-01-13 | 2024-01-15 | 주식회사 크로스워커스 | a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same |
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| Publication number | Publication date |
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| CN105880440B (en) | 2018-09-11 |
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