CA1096663A - Skew rolling mill roller - Google Patents
Skew rolling mill rollerInfo
- Publication number
- CA1096663A CA1096663A CA307,845A CA307845A CA1096663A CA 1096663 A CA1096663 A CA 1096663A CA 307845 A CA307845 A CA 307845A CA 1096663 A CA1096663 A CA 1096663A
- Authority
- CA
- Canada
- Prior art keywords
- stock
- cross
- section
- roller
- rollers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
IMPROVED SKEW ROLLING MILL ROLLER
Abstract of the Disclosure The tapered working roller of a skew rolling mill is provided with a deformation surface in the form of a paraboloid and a smoothing surface at the end of smaller cross-section in the form having the approximate shape of a hyperboloid.
Abstract of the Disclosure The tapered working roller of a skew rolling mill is provided with a deformation surface in the form of a paraboloid and a smoothing surface at the end of smaller cross-section in the form having the approximate shape of a hyperboloid.
Description
6~
This invent~on relates to an improvement in a skew rolling mill of the type described in U.S. Patent No.
3,735,617.
U.S. Patent No. 3,735,617 describes a skew rolling mill which includes a driven roller carrier through which longitudinally extending material is moved, with the roller carrier being rotatably driven about the axis of material which is to be rolled. Three spaced frustroconically shaped working rollers are each rotatably driven in the roller carrier about an axis which intersects with the material to be rolled. The working rollexs reduce the cross-section of the material, and as a result of the angular displacement of the rollers with respect to the axis of the material, the working rollers move such material.
It has ~een found that when this apparatus is used for forming nonferrous metals in regions with small dimensions, and in particular in the case of cold de-formation, optimal rolling results are not achieved. For example, undesirable elevations which are quite marked and which have a helically shaped course, appear on the surface of the roller stock. Furthermore, because the cross section decreases too much in those regions that are formed last, the roller slides quite severely on the rolled product, thereby reducing the quality of the rolled product. -In accordance with the present invention there is provided an improved tapered working roller for a skew rolling mill in which the working surface thereof is in the form or shape of a paraboloid to thereby provide a substantially equal or decreased de~ormation in the cross-section of the deformation taper of the rolled stock.
In accordance with the invention~ a more extensive deformation ~ .
-- 1 -- ~
6~3 can be achieved and undesirable elevations can be eliminated or formed to an extent at ~hich they can be easily removed by a drawing process.
Thus, there is provided an improvement in a skew rolling mill for cross section reduction of an elongated stock as it moves along a longitudinal axis ~ithout rotation about the axis,: comprising a roller support means mounted for rotation about the longitudinal axis, a plurality of tapered working rollers moun-ted ~ithin said roll support means and symmetrically about the longitudinal axis with each of the rollers being mounted for rotation about a secondary axis which intersects the elongated stock, pri-mary means for rotating the roll support means in a first direction and first intermediate means for rotating the rollers about the secondary axis and into the surface of the elongated stock for reducing the cross section of the stock. The improvement which is provided comprises the tapered working rollers each of which includes a first surface which has the shape of a paraboloid for substantially equal or decreasing deformation in the cross section of the deformation taper of the stock.
The deformation in a skew rolling mill can be regarded as a direct sequence of discrete individual de-formations. For example, in the case of a three-roller mill with fiv~e rotations for effecting the deformation, the reduction by rolling occurs 15 times one a~ter the other~
With the linear tapered rollers of the prior art the re-duction of thle diameter is proportional to the progress of the material in the deformation zone, i.e., the relative deformation blecomes larger and larger~ for example with the lS rolling passes over the volume element. But this feature is precisely the one which unfavorably influences - - - ~ :, , : . . , ~6~63 a formation process, particularly in cold deformation, but also in warm deformation. Accord~n~ to the teaching of the invention, working rollers of the skew rolling mill are designed in such a way that the relative formation does not increase, but remai`ns the same, or still better decreases in correspondence with the strain hardening of the material.
Through the above-mentioned measures, the roll~ng force remains the same, but a significantly higher degree of formation is achieved. Furthermore, the undesirable helical elevations do not occur to such a severe extent.
The hel;cal elevations can be inhibited still ~urther, as proposed according to another idea of the invention, by designing the surface of the roller at the end of smaller cross section to provide a smoothing surface in the form having the approximate shape of a hyperboloid.
Nearly optimal rolling results are achieved if the working surface of the working rollers is designed so that it approximately satisfies the formula ~r~ = Vl (1 +~) Rl ~Q~Rl~ ~ + (2 ~Rl) + ~
a . ~1 r2 ~Pl~ (~+1)(~+ 2) In this formula, Vl signifies the feeding speed of the stock; a is the frequency factor (a=3/T with T = revolution time of the rotor); ~ 1 signifies the logarithmic re-duction of cross-section of the first pass; ~ = strain hardening exponent; Rl signifies the`radius of the rolled bar; and r = running ordinate of the rolling contour. The following holds for r;
3 r = Rl exp ( ~1 x nk) where n is the number of rolling passes for a volume element . - .
.
61~3 k ~
A skew rollin~ mill in which the working rollers were designed according to the above formula yielded excellent rolling results. The starting point here was that the slant position of the rolling axles exerts no significant effect on the result of rolling.
The invention is explained in more detail by means of the embodiment shown schematically in Figure 1.
For the sake of clarity, the figure shows only one working roller 1 of a skew rolling mill as disclosed in U.S. Patent 3,735,617.
Referring to the drawin~, thare is shown a tapered working roller 1 which is rotatably d~iven in a roller carrier 2 about an axis which intersects with the stock 3 to be rolled. The roller carrier is rotabably driven about the axis of stock which is rolled~ The working rollers reduce the cross-section of the stock, and as a result of the angular displacement thereof with respect to the axis of the stock, the working rollers move the stock 3.
The working roller 1 essentially consists of a deformation part 10 and a smoothing part 11 at the end of roller 1 of smaller cross-section. While the smoothing part 11 has the form which approximate the shape of a hyperboloid, the surface of the deformation part 10 is in the form o~ a paraboloid which satisfies the above formula.
. ::
: ~ .
This invent~on relates to an improvement in a skew rolling mill of the type described in U.S. Patent No.
3,735,617.
U.S. Patent No. 3,735,617 describes a skew rolling mill which includes a driven roller carrier through which longitudinally extending material is moved, with the roller carrier being rotatably driven about the axis of material which is to be rolled. Three spaced frustroconically shaped working rollers are each rotatably driven in the roller carrier about an axis which intersects with the material to be rolled. The working rollexs reduce the cross-section of the material, and as a result of the angular displacement of the rollers with respect to the axis of the material, the working rollers move such material.
It has ~een found that when this apparatus is used for forming nonferrous metals in regions with small dimensions, and in particular in the case of cold de-formation, optimal rolling results are not achieved. For example, undesirable elevations which are quite marked and which have a helically shaped course, appear on the surface of the roller stock. Furthermore, because the cross section decreases too much in those regions that are formed last, the roller slides quite severely on the rolled product, thereby reducing the quality of the rolled product. -In accordance with the present invention there is provided an improved tapered working roller for a skew rolling mill in which the working surface thereof is in the form or shape of a paraboloid to thereby provide a substantially equal or decreased de~ormation in the cross-section of the deformation taper of the rolled stock.
In accordance with the invention~ a more extensive deformation ~ .
-- 1 -- ~
6~3 can be achieved and undesirable elevations can be eliminated or formed to an extent at ~hich they can be easily removed by a drawing process.
Thus, there is provided an improvement in a skew rolling mill for cross section reduction of an elongated stock as it moves along a longitudinal axis ~ithout rotation about the axis,: comprising a roller support means mounted for rotation about the longitudinal axis, a plurality of tapered working rollers moun-ted ~ithin said roll support means and symmetrically about the longitudinal axis with each of the rollers being mounted for rotation about a secondary axis which intersects the elongated stock, pri-mary means for rotating the roll support means in a first direction and first intermediate means for rotating the rollers about the secondary axis and into the surface of the elongated stock for reducing the cross section of the stock. The improvement which is provided comprises the tapered working rollers each of which includes a first surface which has the shape of a paraboloid for substantially equal or decreasing deformation in the cross section of the deformation taper of the stock.
The deformation in a skew rolling mill can be regarded as a direct sequence of discrete individual de-formations. For example, in the case of a three-roller mill with fiv~e rotations for effecting the deformation, the reduction by rolling occurs 15 times one a~ter the other~
With the linear tapered rollers of the prior art the re-duction of thle diameter is proportional to the progress of the material in the deformation zone, i.e., the relative deformation blecomes larger and larger~ for example with the lS rolling passes over the volume element. But this feature is precisely the one which unfavorably influences - - - ~ :, , : . . , ~6~63 a formation process, particularly in cold deformation, but also in warm deformation. Accord~n~ to the teaching of the invention, working rollers of the skew rolling mill are designed in such a way that the relative formation does not increase, but remai`ns the same, or still better decreases in correspondence with the strain hardening of the material.
Through the above-mentioned measures, the roll~ng force remains the same, but a significantly higher degree of formation is achieved. Furthermore, the undesirable helical elevations do not occur to such a severe extent.
The hel;cal elevations can be inhibited still ~urther, as proposed according to another idea of the invention, by designing the surface of the roller at the end of smaller cross section to provide a smoothing surface in the form having the approximate shape of a hyperboloid.
Nearly optimal rolling results are achieved if the working surface of the working rollers is designed so that it approximately satisfies the formula ~r~ = Vl (1 +~) Rl ~Q~Rl~ ~ + (2 ~Rl) + ~
a . ~1 r2 ~Pl~ (~+1)(~+ 2) In this formula, Vl signifies the feeding speed of the stock; a is the frequency factor (a=3/T with T = revolution time of the rotor); ~ 1 signifies the logarithmic re-duction of cross-section of the first pass; ~ = strain hardening exponent; Rl signifies the`radius of the rolled bar; and r = running ordinate of the rolling contour. The following holds for r;
3 r = Rl exp ( ~1 x nk) where n is the number of rolling passes for a volume element . - .
.
61~3 k ~
A skew rollin~ mill in which the working rollers were designed according to the above formula yielded excellent rolling results. The starting point here was that the slant position of the rolling axles exerts no significant effect on the result of rolling.
The invention is explained in more detail by means of the embodiment shown schematically in Figure 1.
For the sake of clarity, the figure shows only one working roller 1 of a skew rolling mill as disclosed in U.S. Patent 3,735,617.
Referring to the drawin~, thare is shown a tapered working roller 1 which is rotatably d~iven in a roller carrier 2 about an axis which intersects with the stock 3 to be rolled. The roller carrier is rotabably driven about the axis of stock which is rolled~ The working rollers reduce the cross-section of the stock, and as a result of the angular displacement thereof with respect to the axis of the stock, the working rollers move the stock 3.
The working roller 1 essentially consists of a deformation part 10 and a smoothing part 11 at the end of roller 1 of smaller cross-section. While the smoothing part 11 has the form which approximate the shape of a hyperboloid, the surface of the deformation part 10 is in the form o~ a paraboloid which satisfies the above formula.
. ::
: ~ .
Claims (3)
1. In a skew rolling mill for cross section reduction of an elongated stock as it moves along a longitudinal axis without rotation about such axis, com-prising:
a roller support means mounted for rotation about said longitudinal axis;
a plurality of tapered working rollers mounted within said roll support means and symmetrically about said longitudinal axis, each of said rollers being mounted for rotation about a secondary axis which intersects the elongated stock;
primary means for rotating said roll support means in a first direction; and first intermediate means for rotating said rollers about said secondary axis and into the surface of said elongated stock for reducing the cross section of said stock;
the improvement comprising said tapered working rollers each including a first surface having the shape of a paraboloid for substantially equal or decreasing deformation in the cross section of the deformation taper of said stock.
a roller support means mounted for rotation about said longitudinal axis;
a plurality of tapered working rollers mounted within said roll support means and symmetrically about said longitudinal axis, each of said rollers being mounted for rotation about a secondary axis which intersects the elongated stock;
primary means for rotating said roll support means in a first direction; and first intermediate means for rotating said rollers about said secondary axis and into the surface of said elongated stock for reducing the cross section of said stock;
the improvement comprising said tapered working rollers each including a first surface having the shape of a paraboloid for substantially equal or decreasing deformation in the cross section of the deformation taper of said stock.
2. The skew rolling mill of Claim 1 wherein each of said tapered working rollers has a second surface, immediately adjacent said first surface and defining the smaller end of said tapered working roller, having the approximate shape of a hyperboloid for smoothing helically shaped protrusions and grooves caused by said first surface in the surface of the elongated stock during the cross section reduction thereof.
3. The skew rolling mill of Claim 1 wherein each first surface of said tapered working rollers satisfies the formula:
wherein V1 is the feeding speed of the elongated stock as it moves along the longitudinal axis at a location prior to its engagement by said working rollers;
a = 3/T wherein T is the revolution time of said roller support means;
.theta. 1 is the logarithmic reduction of the cross section of the first pass of said working surface of said roller about said stock;
.alpha. = strain hardening exponent of said stock;
R1 signifies the radius of said stock after its cross section has been reduced; and k = R1 exp (? x nk) where n is the number of roller passes for a volume element and k = (1 +.alpha.)-1.
wherein V1 is the feeding speed of the elongated stock as it moves along the longitudinal axis at a location prior to its engagement by said working rollers;
a = 3/T wherein T is the revolution time of said roller support means;
.theta. 1 is the logarithmic reduction of the cross section of the first pass of said working surface of said roller about said stock;
.alpha. = strain hardening exponent of said stock;
R1 signifies the radius of said stock after its cross section has been reduced; and k = R1 exp (? x nk) where n is the number of roller passes for a volume element and k = (1 +.alpha.)-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA307,845A CA1096663A (en) | 1978-07-21 | 1978-07-21 | Skew rolling mill roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA307,845A CA1096663A (en) | 1978-07-21 | 1978-07-21 | Skew rolling mill roller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1096663A true CA1096663A (en) | 1981-03-03 |
Family
ID=4111938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA307,845A Expired CA1096663A (en) | 1978-07-21 | 1978-07-21 | Skew rolling mill roller |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1096663A (en) |
-
1978
- 1978-07-21 CA CA307,845A patent/CA1096663A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |