CN105880440B - The cold rolling process of riffled tube - Google Patents
The cold rolling process of riffled tube Download PDFInfo
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- CN105880440B CN105880440B CN201610330197.4A CN201610330197A CN105880440B CN 105880440 B CN105880440 B CN 105880440B CN 201610330197 A CN201610330197 A CN 201610330197A CN 105880440 B CN105880440 B CN 105880440B
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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
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- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The present invention relates to a kind of cold rolling process of riffled tube.This method is mainly：Hollow forging is sent into cold-rolling mill and is rolled, while hollow forging being kept to be sent into；In the operation of rolling, metal flows into the internal thread groove of plug, and the inner wall of hollow forging from the superficial to the deep gradually forms a plurality of threaded line from scratch, while hollow forging subtracts wall tube reducing, 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 is rotated, plug is made to be turned round relative to the hollow forging, makes the plug that the derotation occur relative to riffled tube.The present invention uses special internal thread plug and external mold, rolling reduction is big when making tubulation, while reducing cold rolling pass, it is ensured that pipe obtained has excellent quality.
Description
Technical field
The present invention relates to a kind of tube rolling method more particularly to a kind of cold rolling process of riffled tube.
Background technology
Riffled tube is commonly used in field of heat exchange as the term suggests being exactly the metal tube that inner wall has spiral bar line.And it is existing
In technology, riffled tube is manufactured with cold-drawing method.Such as application No. is 200510013531.5 Chinese invention patent Shens
Please, it discloses a kind of production method of cold-drawn riffled tube, it includes：A, according to the mould of conventional design cold-drawn riffled tube
Tool, including：External mold, core bar and the plug with spiral grooves；B, the plug with spiral grooves and external mold are using advanced placement side
Method adjusts the external mold relative position of plug by core bar, so that plug sizing tape load point is deviateed sizing to handle direction and take up
Initial point position, deviation distance numerical value are 0.5mm-3mm；C, the draw that cold-drawn steel tube with internal thread is carried out according to conventional method is molded, and is obtained
To cold-drawn steel tube with internal thread finished product.Using this method, solves the problems, such as high rejection rate.But cold-drawn is constantly present problem, this is related to
And the forming principle to tubulation, cold-drawn belong to pulling method, the always more or less presence of helix deviates setting, helix angle
Drawing is big, causes precision not high.Cold rolling belongs to extrusion, in the mobility of metal, in product quality, hence it is evident that better than cold
Pull out, but it is also problematic in manufacture do not solve, such as interior screwed pipe at the time of molding with the chimeric lockout issue of internal thread plug, cause
Make the report of current cold rolling riffled tube not yet.
Invention content
The invention solves the above problems, to provide a kind of cold rolling process of riffled tube.
Technical proposal that the invention solves the above-mentioned problems is as follows:
The cold rolling process of riffled tube, includes the following steps：
A, hollow forging is sent into cold-rolling mill, so that hollow forging inner wall is nested on plug, waste pipe outer wall connects with the annular groove of external mold
It touches, and hollow forging is made to be sent into；
B, so that the external mold of cold-rolling mill is carried out reciprocal rolling to hollow forging, make the tube wall of hollow forging that metal occur by squeezing action
Flowing；
C, continue reciprocal rolling, in the internal thread groove that metal flows into plug, the inner wall of hollow forging from scratch by it is shallow enter
A plurality of threaded line is gradually formed deeply, while hollow forging subtracts wall tube reducing, form 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 is rotated, so that plug is turned round relative to the hollow forging, make the plug relative to interior
The derotation occurs for screwed pipe.
As a preferred embodiment of the above technical solution, the external mold is the external mold of two-roller mill.
As a preferred embodiment of the above technical solution, the plug is rhabodoid, squeezes into section, rolling including what is be integrally connected successively
Section and extruding zone；The outer surface of the rolling section and the extruding zone is provided with thread-like groove, the depth of the thread-like groove
Degree is gradually deepened by the rolling section to the extruding zone；The plug is squeezed into described in section to the direction of the extruding zone,
The outer profile of cross section is formed by diameter of a circle and tapers into.
As a preferred embodiment of the above technical solution, the outer profile of the cross section be formed by diameter of a circle taper into so that
Two long sides of the axial cross section of the plug are curve, i.e., from the section of squeezing into the extruding zone, the outer profile of cross section
The rate that diameter of a circle becomes smaller is formed by be gradually reduced.
As a preferred embodiment of the above technical solution, two long sides are curve close to the part for squeezing into section, close
A part for the extruding zone is straight line.
As a preferred embodiment of the above technical solution, the curve is a parabolical part.
As a preferred embodiment of the above technical solution, the described one end of section far from the rolling section of squeezing into is provided with mounting portion.
As a preferred embodiment of the above technical solution, the mounting portion is to be provided with externally threaded rhabodoid, the mounting portion
The diameter of cross section is less than the diameter of the cross section for squeezing into section.
As a preferred embodiment of the above technical solution, the outer surface for squeezing into section is shiny surface.
As a preferred embodiment of the above technical solution, the extruding zone includes close to the rolling screw thread deepened section of section and separate
The screw thread of the rolling section rolls solid section, and the depth of thread-like groove is gradually deepened until arriving the screw thread in the screw thread deepened section
No longer deepen until rolling solid section.
The invention has the advantages that：
1, the present invention uses special internal thread plug, and when external mold rolls, the power for squeezing generation acts on tube wall, makes tube wall
Metal flow, be gradually flowed into the internal thread groove of plug, meanwhile, pipe solves to manage with Mandrel Rotating
The roundness problem of son, ultimately forms internal thread pipe；
2, after the completion of pipe rolls, the internal thread groove generation of the internal thread and plug of inner tubal wall is sealed, can not be direct
Screwed pipe is sent into；The present invention uses the in time derotation so that plug is deviate from from closing component structure, and then realizes sending for screwed pipe
Into realizing the normal operation of entire process；
3, the present invention uses special internal thread plug, and from the point of view of the axial section of the plug, sideline is curvilinear structures,
Especially parabola designs, so that it may in this way to realize being smoothed out for technique；In parabolical initial segment, slope is larger, and
Slope gradually becomes smaller afterwards, this meets characteristic of the metal pipe-wall when metal flow occurs；For cold-rolling process, metal material
Material itself have certain mobility, the amount of rolling is more, and it is also bigger to roll required power, it is generally the case that then with
The progress of rolling, needs the power that roll provides can be increasing, is such as the pipe of conventional cold rolling such as inner wall smooth, the stream of metal
Dynamic direction is only the direction rolled, and therefore, there is no too big problems, it is only necessary to which Cold-rolling Parameters are suitably adjusted.And
What we were now to rolling is riffled tube, and the flowing of metal is not only the direction of rolling, and at least part metals will be filled out
It is pressed in the thread groove of internal thread mold, at this point, roll-force is broken down into the power of multiple directions, therefore, it is necessary to the power of bigger to come
The flowing of metal is pushed, conventional shape is such as also used at this time, then rolling can be made to be difficult to carry out.The present inventor puts into practice by multiple,
Show that curvilinear plug can solve the problems, such as this conclusion.Curvilinear plug is equivalent to a cushioning effect, because making forward
The metal of flowing is directly turned and is difficult in the thread groove for flowing into internal thread mold, but by the correction of curve, by song
The gradient of line so that the metal of flow forward is first converted into slanting flowing, it is caused to be easy to be pushed into internal thread mold
Thread groove in.In addition, curve provides additional space for the flowing of metal in the rolling direction, rolling is got up more effortless.
Again since the depth of the thread groove of internal thread mold is gradual change, is smooth at the beginning, then thread groove starts
It is existing, but then thread groove is gradually deepened, last screw thread Slot shaping, and therefore, with going deep into for rolling degree, metal is pushed entrance
Also variation is occurring constantly for the complexity in the thread groove of internal thread mold；So being had using oblique line using curve ratio
Superior technique effect.
Description of the drawings
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 forgings, 1 '-riffled tube, 2- plugs, 3- external molds, 3-1- annular grooves, 21- squeezes into section, and 22- rolls section,
23- extruding zones, 24- mounting portions, 231- screw thread deepened sections, 232- screw threads roll solid section.
Specific implementation mode
Below in conjunction with attached drawing, the present invention will be described in detail.
Present embodiment is only explanation of the invention, is not limitation of the present invention.People in the art
Member's any change for being made after the specification for having read the present invention, as long as in the range of claims, it all will be by
The protection of Patent Law.
As illustrated in fig. 1 and 2, this 2 cold rolling process for showing riffled tube.In figure, 1 is hollow forging, and 1 ' is passed through by hollow forging 1
Cross the riffled tube formed after the rolling of mold.Mold includes plug 2 and external mold 3.Plug 2 serves as a contrast in hollow forging 1, and external mold 3 includes
Upper die and lower die, upper die and lower die pairing setting, and pipe is then in the annular groove 3-1 of upper die and lower die.The specific method is as follows.
The cold rolling process of riffled tube, includes the following steps：
A, hollow forging 1 is sent into cold-rolling mill, so that hollow forging inner wall is nested on plug 2, the annular groove 3- of waste pipe outer wall and external mold 3
1 is in contact, and hollow forging is made to be sent into；
B, so that the external mold 3 of cold-rolling mill is carried out reciprocal rolling to hollow forging, make the tube wall of hollow forging that gold occur by squeezing action
Belong to flowing；
C, continue reciprocal rolling, in the internal thread groove that metal flows into plug 2, the inner wall of hollow forging from scratch by it is shallow enter
A plurality of threaded line is gradually formed deeply, while hollow forging subtracts wall tube reducing, form riffled tube 1 '；
During rolling internal thread, while keeping hollow forging 1 to be sent into, hollow forging 1 is set to rotate, to solve pipe
Roundness problem；
During hollow forging 1 is sent into and is rotated, plug 2 is made to be turned round relative to the hollow forging 1, keeps the plug 2 opposite
In riffled tube 1 ' occur the derotation, to solve internal thread of pipe and plug internal thread groove lockout issue.
As shown in figure 3, plug 2 described in the plug 2 is rhabodoid, squeezes into section 21 including what is be integrally connected successively, rolls
Section 22 processed and extruding zone 23；The outer surface of the rolling section 22 and the extruding zone 23 is provided with thread-like groove, the screw thread
The depth of shape groove is gradually deepened by the rolling section 22 to the extruding zone 23；The plug 2 is in the section 21 of squeezing into institute
On the direction for stating extruding zone 23, the outer profile of cross section is formed by diameter of a circle and tapers into.The outer profile of the cross section
It is curve to be formed by diameter of a circle and taper into two long sides of the axial cross section for making the plug 2, i.e., is squeezed into from described
To the extruding zone 23, the outer profile of cross section is formed by the rate that diameter of a circle becomes smaller and is gradually reduced section 21.Described in two
Long side is curve close to the part for squeezing into section 21, and the part close to the extruding zone 23 is straight line.The curve is
A parabolical part.The described one end of section 21 far from the rolling section 22 of squeezing into is provided with mounting portion 24.The mounting portion 24
To be provided with externally threaded rhabodoid, the diameter of the cross section of the mounting portion 24 is less than the straight of the cross section for squeezing into section 21
Diameter.The outer surface for squeezing into section 21 is shiny surface.The extruding zone 23 includes the screw thread deepened section close to the rolling section 22
231 and the screw thread far from the rolling section 22 roll solid section 232, the depth of thread-like groove is gradual in the screw thread deepened section 231
Deepen until no longer deepening until the screw thread rolls solid section 232.
Claims (1)
1. the cold rolling process of riffled tube, includes the following steps：
A, by hollow forging（1）It is sent into cold-rolling mill, hollow forging inner wall is made to be nested in plug（2）On, waste pipe outer wall and external mold（3）Annular groove
（3-1）It is in contact, and hollow forging is made to be sent into；
B, make the external mold of cold-rolling mill（3）Reciprocal rolling is carried out to hollow forging, makes the tube wall of hollow forging that metal occur by squeezing action
Flowing；
C, continue reciprocal rolling, when metal flows into plug（2）Internal thread groove in, the inner wall of hollow forging is from scratch from the superficial to the deep
A plurality of threaded line is gradually formed, while hollow forging subtracts wall tube reducing, 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 is rotated, make plug（2）Relative to the hollow forging（1）Revolution, makes the plug（2）Relatively
In riffled tube（1’）The derotation occurs；
The external mold（3）For the external mold of two-roller mill（3）；
The plug（2）For rhabodoid, section is squeezed into including what is be integrally connected successively（21）, rolling section（22）And extruding zone（23）；
The rolling section（22）With the extruding zone（23）Outer surface be provided with thread-like groove, the depth of the thread-like groove by
The rolling section（22）To the extruding zone（23）Gradually deepen；The plug（2）Section is squeezed into described（21）To the extrusion
Section（23）Direction on, the outer profile of cross section is formed by diameter of a circle and tapers into；
The outer profile of the cross section is formed by diameter of a circle and tapers into so that the plug（2）Two of axial cross section
Long side is curve, i.e., squeezes into section from described（21）To the extruding zone（23）, the outer profile of cross section is formed by diameter of a circle
The rate to become smaller is gradually reduced；
Two long sides squeeze into section close to described（21）A part be curve, close to the extruding zone（23）A part be
Straight line；
The curve is a parabolical part；
It is described to squeeze into section（21）Far from the rolling section（22）One end be provided with mounting portion（24）；
The mounting portion（24）To be provided with externally threaded rhabodoid, the mounting portion（24）Cross section diameter be less than it is described
Squeeze into section（21）Cross section diameter；
It is described to squeeze into section（21）Outer surface be shiny surface；
The extruding zone（23）Including close to the rolling section（22）Screw thread deepened section（231）With the separate rolling section（22）
Screw thread roll solid section（232）, the screw thread deepened section（231）The depth of upper thread-like groove is gradually deepened until arriving the screw thread
Roll solid section（232）Until no longer deepen.
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 |
|---|---|
| CN105880440A CN105880440A (en) | 2016-08-24 |
| CN105880440B true 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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Families Citing this family (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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1480944A1 (en) * | 1987-06-29 | 1989-05-23 | Челябинский Политехнический Институт Им.Ленинского Комсомола | Method of rolling articles with inner helical rings |
| 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 |
| 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 |
-
2016
- 2016-05-18 CN CN201610330197.4A patent/CN105880440B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1480944A1 (en) * | 1987-06-29 | 1989-05-23 | Челябинский Политехнический Институт Им.Ленинского Комсомола | Method of rolling articles with inner helical rings |
| 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 |
| 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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| CN105880440A (en) | 2016-08-24 |
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