CN205146877U - Stretch reducing mill work unit roll pass - Google Patents
Stretch reducing mill work unit roll pass Download PDFInfo
- Publication number
- CN205146877U CN205146877U CN201520971958.5U CN201520971958U CN205146877U CN 205146877 U CN205146877 U CN 205146877U CN 201520971958 U CN201520971958 U CN 201520971958U CN 205146877 U CN205146877 U CN 205146877U
- Authority
- CN
- China
- Prior art keywords
- roll
- steel pipe
- work unit
- seamless steel
- stretch
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- Expired - Fee Related
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- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The utility model provides a stretch reducing mill work unit roll pass, belongs to seamless steel pipe finish rolling technical field, and every frame of stretch reducing mill work unit evenly is provided with three roll along the circumferencial direction, and the roll contacts with rolling the pipe, and contact deal with face be the oval arc to the roll indent, and oval arc top is to the recess of the inboard setting of roll about rolling tub axial symmetry, and the recess width is 2mm, and the degree of depth of recess is 4~4.2mm. The utility model discloses can improve seamless steel pipe's finished product quality, effectively alleviate " interior polygon " phenomenon that the tension reducing pipe produced, during production seamless steel pipe, thickness control is more ideal, satisfies the in -service use, and the practical application of mill of being convenient for has moreover improved seamless steel pipe's finished product quality and production efficiency.
Description
Technical field
The utility model belongs to mill of seamless steel tube technical field, particularly a kind of stretch-reducing mill work unit roll pass.
Background technology
The production of seamless steel pipe generally includes perforation (rolling) hollow billet, rolling hollow forging and is rolled into QC three operations.At present, perforation process adopts two-roller skew-rolling technique that solid blank is rolled into hollow hollow billet usually, rolling hollow forging mainly by heavy wall hollow billet under the prerequisite of ensuring the quality of products, be rolled into wall thickness dimension and the precision of production tube requirement.
Determining tube reducing is one of finishing operation in steel pipe's production three large deformation, be produce in multi items, the effective ways of minor diameter thin wall pipe, middle thick-walled pipe, the operating rate scope of stretch-reducing mill is very wide, therefore the hollow forging of same diameter and wall thickness can be used, obtained the production tube of a series of different-diameter and wall thickness by the speed ratio changed between frame, greatly can simplify production technology like this, expand range of product size, effectively improve the productivity ratio of unit, reduce the production cost of steel pipe producer.Because stretch reducing technology is relevant with factors such as deflection, frame spacing, mill speed, mean tension, single chassis reducing rate, wall thickness coefficient, roll nominal diameter, coefficient of friction, rolling temperatures, so, steel pipe is at sizing, inevitably produce a series of product defects in micro-tension reducing and tension diameter-reducing procedure, the inwall as steel pipe easily produces problems such as " inner polygons ".
For the mechanism that " inner polygon " produces, domestic and international many scholars have done a lot of work to this.The Jiang Yongzheng of Central South University has done deep analysis to this.Research finds: (1) circumferential flow of metal when single chassis rolling flows to roll gap from pass top, corresponding pass angle ± 30 are ° (for the arbitrary roll in Fig. 1 roller of three-roller tension reducing mill pass figure, the pass angle of apertured type tip position is 0 °, pass angle, roll gap place is ± 60 °) circumferential flow of place's metal is most active, the metal circumferential flow near pass top and Roll-gap position is poor.Due in actual production, three-roller tension reducing mill is staggered according to-Y and+Y, and alternate angle is 60 °.(2) from the whole operation of rolling, the total circumferential flow of metal is the position flowing of ± 30 ° from pass top and roll gap to pass angle, thus cause pass angle to be that the wall thickness of the position of ± 30 ° is thicker than other positions, there is the reason of " inner polygon " phenomenon in steel duct that Here it is.
" inner polygon " phenomenon of steel pipe has no idea to eliminate in tension diameter-reducing procedure, " inner polygon " phenomenon of finished product can only be alleviated to a certain extent, usually undertaken by following two kinds of modes in prior art: (1), reasonable distribution single chassis reducing rate, single chassis reducing rate can not be excessive; (2), under the prerequisite that ensures de-pipe, less ovality is adopted.But, affect the factor producing polygon phenomenon in stretch reducing pipe a lot, and many technological parameters are again continuously, dynamic change, above two kinds of measures are only relied on to alleviate production tube " inner polygon " phenomenon, effectively can not alleviate the polygon phenomenon produced in stretch reducing pipe, this directly causes wall thickness of seamless steel tube uneven, have impact on the end product quality of seamless steel pipe.
Utility model content
In order to improve the end product quality of seamless steel pipe, effectively alleviate " inner polygon " phenomenon that stretch reducing pipe produces, the utility model provides a kind of stretch-reducing mill work unit roll pass.
The utility model is achieved by the following technical programs:
A kind of stretch-reducing mill work unit roll pass, it is characterized in that: each frame of stretch-reducing mill work unit is along the circumferential direction evenly provided with three rolls, roll contacts with tube rolling, contact position section is the elliptic arc to roll indent, and elliptic arc arc top is arranged about the axially symmetrical groove of tube rolling inside roll.
Described recess width is 2mm, and the degree of depth of groove is 4 ~ 4.2mm.
The utility model compared with prior art has following beneficial effect:
The utility model can improve the end product quality of seamless steel pipe, and effectively alleviate reducer and produce " inner polygon " phenomenon, when producing seamless steel pipe, wall thickness control is more satisfactory, meets actual use, improves end product quality and the production efficiency of seamless steel pipe.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in more detail.
Fig. 1 is common stretch-reducing mill tension force landing unit roll pass structural representation.
Fig. 2 is that pass structural representation after groove offered by stretch-reducing mill tension force landing unit roll.
In figure: 1 is roller tension reducing mill frame, and L1 is Grooves of Stretch Reducing Mill center line, L2 is stretch-reducing mill center of arc line, a
ifor the major semiaxis of pass, b
ifor the semi-minor axis of pass, d
ifor the average diameter of pass, R
ifor the arc radius of pass, r
ifor roll radius of corner, t
ifor roller gap, L is recess width, and H is depth of groove.
Detailed description of the invention
Below for φ 180mmMPM unit, this unit adopts mixed drive three-roller type (nominal diameter D
mfor 360mm) stretch-reducing mill, the production tube of to be the hollow forging tube reducing of φ 164mm by external diameter be φ 134.32mm, waste thickness of pipe wall is 4.1mm.
A kind of stretch-reducing mill work unit roll pass, it is characterized in that: each frame of stretch-reducing mill work unit is along the circumferential direction evenly provided with three rolls, roll contacts with tube rolling, contact position section is the elliptic arc to roll indent, and elliptic arc arc top is arranged about the axially symmetrical groove of tube rolling inside roll.
Described recess width is 2mm, and the degree of depth of groove is as shown in table 1.
Table 1 three-roller tension reducing mill pass parameters:
In three-roller tension reducing mill pass parameters:
A
ifor the major semiaxis of roll pass;
B
ifor the semi-minor axis of roll pass;
D
ifor the average diameter of roll pass, namely this frame rolls the average diameter of rear steel pipe, d
i=a
i+ b
i;
R
ifor the arc radius of roll pass,
;
E
ifor the center of circle of roll pass circular arc and the eccentric throw of pass center line, e
i=R
i-b
i;
R
ifor roll radius of corner, universal experience is got: r
i=(0.05 ~ 0.1) × d
i;
T
ifor roller gap, t
i=(1 ~ 1.5) mm;
L is recess width;
H is depth of groove.
So arrange groove H and L, the polygonal limit number inside the Pass obtaining is 12, and between adjacent edge, angle is 150 °.Through analog simulation, the part that thickness of pipe wall is the thinnest is 4.0135mm, and the part that thickness of pipe wall is the thickest is 4.9349mm.Compared to the prior art comparatively, not only " dodecagon " comparatively " interior hexagon " closer to circle, and the even phenomenon of steel pipe inner wall uneven distribution is alleviated to some extent, ensure that the quality of produced seamless steel pipe finished product.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from the utility model aim.
Claims (2)
1. a stretch-reducing mill work unit roll pass, it is characterized in that: each frame of stretch-reducing mill work unit is along the circumferential direction evenly provided with three rolls, roll contacts with tube rolling, contact position section is the elliptic arc to roll indent, and elliptic arc arc top is arranged about the axially symmetrical groove of tube rolling inside roll.
2. a kind of stretch-reducing mill work unit roll pass according to claim 1, it is characterized in that: recess width is 2mm, the degree of depth of groove is 4 ~ 4.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520971958.5U CN205146877U (en) | 2015-11-30 | 2015-11-30 | Stretch reducing mill work unit roll pass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520971958.5U CN205146877U (en) | 2015-11-30 | 2015-11-30 | Stretch reducing mill work unit roll pass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205146877U true CN205146877U (en) | 2016-04-13 |
Family
ID=55682618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520971958.5U Expired - Fee Related CN205146877U (en) | 2015-11-30 | 2015-11-30 | Stretch reducing mill work unit roll pass |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205146877U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107497954A (en) * | 2017-10-12 | 2017-12-22 | 北京京诚之星科技开发有限公司 | Supercharged necking machine |
-
2015
- 2015-11-30 CN CN201520971958.5U patent/CN205146877U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107497954A (en) * | 2017-10-12 | 2017-12-22 | 北京京诚之星科技开发有限公司 | Supercharged necking machine |
| CN107497954B (en) * | 2017-10-12 | 2024-04-05 | 北京京诚瑞信长材工程技术有限公司 | Supercharged necking machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160413 Termination date: 20171130 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |