GB2078579A - A Method for Preparing a Polygonal Billet or Ingot for Processing in a Skew-roller Piercing Mill - Google Patents
A Method for Preparing a Polygonal Billet or Ingot for Processing in a Skew-roller Piercing Mill Download PDFInfo
- Publication number
- GB2078579A GB2078579A GB8029443A GB8029443A GB2078579A GB 2078579 A GB2078579 A GB 2078579A GB 8029443 A GB8029443 A GB 8029443A GB 8029443 A GB8029443 A GB 8029443A GB 2078579 A GB2078579 A GB 2078579A
- Authority
- GB
- United Kingdom
- Prior art keywords
- blank
- polygonal
- ingot
- cast
- skew
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000004080 punching Methods 0.000 description 7
- 238000005266 casting Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/026—Rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/08—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process
- B21B13/10—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process all axes being arranged in one plane
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/10—Compression, e.g. longitudinal compression
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
In order to prepare a blank (3), in the form of a rolled or cast polygonal billet or cast polygonal ingot, for processing in a skew-roller piercing mill, the longitudinal edges of the blank are cylindrically deformed to approximately circular cross section. The blank (3) is deformed in a roll stand (11) comprising grooved rolls (13 to 16) defining a substantially circular pass, the blank being pushed through a guide (10) to the rolls, by means of a ram. The stand may have two sets of rolls arranged in tandem. <IMAGE>
Description
SPECIFICATION
A Method and Apparatus for Preparing a
Polygonal Billet or Block for Processing in a
Skew-roller Piercing Mill
This invention relates to a method and
apparatus for preparing a rolled or cast polygonal billet or cast polygonal ingot for processing in a
skew-roller piercing mill.
In the manufacture of seamless tubes, it is necessary during a first manufacturing stage to
pierce the blanks, i.e. rolled or continuously cast
billets or ingots produced by conventional casting.
The holes are formed in the blanks either in a
punching press or a skew-roller piercing mill.
The advantage of using a punching press for
piercing is that the blanks used can be round
(circular), square, hexagonal, octagonal or twelve
sided in cross-section, the polygonal blanks being
cheaper to produce than round blanks. In order,
however, to obtain a well-perforated blank with a
bore having minimum eccentricity, it is found in
practice that the ratio of the blank length to the
hole diameter in the punching press must not
exceed about 7:1 to 10:1. This of course limits
the maximum weight of a blank which can be
placed in a punching press.
This disadvantage of using a punching press
for piercing is admittedly absent when a skew
roller piercing mill is used, where the blank
length/diameter ratio can be much greater than
for the maximum weight of a blank which can be
accommodated in a punching press. However,
blanks for processing in a skew-roller piercing mill
have to be made round in cross-section. Round
ingots or round billets have the disadvantage that
they are more expensive to make than polygonal
ingots or billets and also pose greater problems
regarding quality. This applies both to stationary
casting and continuous casting.
The invention therefore is based on the
problem of providing a method and apparatus
which can make use of the qualitative and
ecomomic advantage of polygonal ingots or
billets for processing in skew-roller piercing mills.
The method of the invention is based on the
discovery that a billet or ingot can be efficiently
engaged and conveyed through a skew-roller
piercingmill even if the cross-section of the billet
or ingot is only approximately round.
In accordance with the invention, there is provided a method of preparing a blank, in the form of a rolled or cast polygonal cross-section billet or cast polygonal cross-section ingot, for
processing in a skew-roller piercing mill, which
method includes cylindrically deforming the
longitudinal edges of the polygonal blank so that
the diameter of the circle circumscribing the thus
deformed edge regions and having its centre on
the longitudinal axis of the polygonal blank is
approximately equal to the diameter of the circle
to whirh the straight side surfaces connecting the
longitudinal edges of the polygonal blank before
deformation are tangential.
The result of such deformation is a blank crosssection which has sufficiently large peripheral cylindrical surface regions for the blank to be efficiently engaged and pulled through a skewroller piercing mill.
A significant advantage of the method according to the invention is that the positive features of rolling or casting odpolygonal billets or ingots (these relate mainly to quality and low cost) can now be combined with the advantages resulting mainly from the considerably higher weight blanks which can be perforated in a skewroller piercing mill compared to a punching press.
In order further to increase the profitabiltiy, according to another feature of the invention in this connection, the billet or block having deformed longitudinal edges is supplied to a skew-roller piercing mill at approximately the same temperature.
Apparatus in accordance with the invention, comprises apparatus for preparing a blank, in the form of a rolled or cast polygonal cross-section billet or cast polygonal cross-section ingot, for processing in a skew-roller piercing mill, which apparatus includes a roll stand comprising a plurality of grooved rolls having axes in the same plane and cross-sections having double or multiple corners and combining to form an approximately round pass.
With regard to the shape of the round-pass cross-sections cut peripherally in the grooved rolls, it is important that the relatively sharp or slightly rounded longitudinal edges of a polygonal section blank can be cylindrically deformed until there is a minimum difference between the diameter of the circle circumscribing the deformed edge regions and the diameter of the circle to whictthe straight peripheral surfaces connecting the longitudinal edges of the polygonal blank before deformation are tangential. This ensures that the rollers in the skew-roller piercing mill can reliably grip the ingot or billet and convey it through the mill.
In a preferred embodiment of the apparatus according to the invention, the roll stand has four grooved rolls having axes at 90 intervals and disposed in the same vertical plane. A set of rolls of the aforementioned kind ensures e.g. that an octagonal block can be efficiently deformed until its cross-section is approximately round.
According to another embodiment of the invention, however, the roll stand contains two sets of grooved rolls one set being behind the other. This embodiment is of use when the blanks for producing seamless pipes are square section ingots. In such cases the four longitudinal edges of the polygonal ingot are first compressed in a first set of grooved rolls so aeto produce an octagonal section. In the second set of rolls, the last-mentioned section is deformed until it is approximately round, when thediameter of the circle circumscribing the cross-section is approximately equal to the diameter of the circle inscribe in the cross-section.
The grooved rolls of the stand can be either driven or not. If the rolls are driven, according to an advantageous embodiment, the peripheral speed of the grooved rolls is adjusted to the advance speed of the billet or ingot which is moved relative to the rolls. The adjusting means can be mechanical or electronic. If the grooved rolls are not driven, there will of course be no need to connect the rolls by transmission means, e.g. gearwheels.
A pusher may be provided for pushing the billet or ingot towards the roll stand and may be actuated by a hydraulic or pneumatic cylinder or an electric motor. Preferably the pusher is reciprocated by a hydraulic cylinder.
In order that the invention may be readily understood, an embodiment thereof will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a plan view of an apparatus embodying the invention for deforming a polygonal ingot:
Figure 2 shows the apparatus in vertical longitudinal section along line Il-Il of Figure 1;
Figure 3 is a vertical section through the apparatus along line Ill-Ill in Figure 2;
Figure 4 shows another vertical section through the apparatus along IV--IV in Figure 2;
Figure 5 is an end view of an ingot having an octagonal transverse cross-section before its longitudinal edges have been deformed; and
Figure 6 likewise is an end view of the octagonal ingot in Figure 5 after its longitudinal edges have been deformed.
Figures 1 and 2 show an apparatus 2 for deforming a polygonal ingot 3, the apparatus having a frame 1. At one end the device 2, which is shown only schematically, has a hydraulic cylinder 4 extending in the vertical central longitudinal plane. A pusher 6 is secured to the end face of the piston rod 5 of the cylinder 4. The cylinder 4 is supported on brackets 7 and 8 fixed to frame 1.
The pusher 6 can be used, for example, to push an octagonal ingot 3 sliding in a feed bed 9 (see
Figure 4) into a centring sleeve 10 from where it is conveyed to a set 11 of grooved rolls (see
Figure 3). After leaving roller set 11, and ingot 3 has been peripherally deformed and is supplied by a roller conveyor 12 to a skew-roller piercing mill (not shown).
Roller set, 11 comprises four grooved rolls 13, 14, 1 5 and 1 6 at 900 intervals and having axes 18, 19, 20, 21 in a common vertical plane in a roll stand 17. Rolls 13 to 1 6 all have cylindrical crosssections and, as shown more particularly in Figure 3, combine to form a substantially round pass 22.
Rolls 13 to 1 6 are rotatably driven and, to this end, the grooved rolls 13, 1 6 and 1 5 downstream of roll 14, which is secured to a drive shaft 23, are inter-connected by bevel gearing 24, 25 and 26.
Before being introduced into the centring sleeve 10, the polygonal ingot 3 sliding in bed 9 has approximately the cross-section shown in detail in Figure 5, the longitudinal edges 27 of ingot 3 being slighly rounded.
In the set of rolls 11, the longitudinal edges 27 of ingot 3 are cylindrically deformed (see Figure 3) so that the diameter D of the circle DK circumscribing the deformed edge regions 28 and having its centre on the longitudinal axis LA of ingot 3 is approximately equal to the diameter d of the circle dk to which the straight side surfaces 29 connecting the longitudinal edges 27 of ingot 3 before deformation are tangential.
Claims (11)
1. A method of preparing a blank, in the form of a rolled or cast polygonal cross-section billet or cast polygonal cross-section ingot, for processing in a skew-roller piercing mill, which method includes cylindrically deforming the longitudinal edges of the polygonal blank so that the diameter of the circle circumscribing the thus deformed edge regions and having its centre on the longitudinal axis of the polygonal blank is approximately equal to the diameter of the circle to which the straight side surfaces connecting the longitudinal edges of the polygonal blank before deformation are tangential.
2. A method according to claim 1, wherein the blank having deformed longitudinal edges is supplied to a skew-roller piercing mill at approximately the same temperature.
3. Apparatus for preparing a blank, in the form of a rolled or cast polygonal cross-section billet or cast polygonal cross-section ingot for processing in a skew-roller piercing mill, which apparatus includes a roll stand comprising a plurality of grooved rolls having axes in the same plane and cross-sections having double or multiple corners and combining to form an approximately round pass.
4. Apparatus according to claim 3, wherein the roll stand has four grooved rolls having axes at 900 intervals and disposed in the same vertical plane.
5. Apparatus according to claim 3 or 4, wherein the roll stand contains two sets of grooved rolls, one set being behind the other.
6. Apparatus according to any one of claims 3 to 5, wherein the grooved rolls are driven.
7. Apparatus according to claim 6, wherein the peripheral speed of the grooved rolls is adjusted to the speed of advance of the blank which is moved relative to the rolls.
8. Apparatus according to claim 7, whereon a pusher is provided for pushing a blank forward to the roll stand and is actuated by a hydraulic br pneumatic cylinder or an electric motor.
9. A method of preparing a rolled or cast polygonal cross-section billet or ingot for processing in a skew-roller piercing mill substantially as hereinbefore described with reference to the accompanying drawings.
10. Apparatus for preparing a rolled or cast polygonal billet or ingot for processing in a skewroller piercing mill substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawings.
11. Any novel feature or combination of features herein described.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3023284A DE3023284A1 (en) | 1980-06-21 | 1980-06-21 | METHOD AND DEVICE FOR MANUFACTURING A MULTI-EDGED BLOCK OR FOR THE PROCESSING IN A SLOPED HOLE ROLLING MILL. BLOCKS |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2078579A true GB2078579A (en) | 1982-01-13 |
GB2078579B GB2078579B (en) | 1983-09-01 |
Family
ID=6105135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8029443A Expired GB2078579B (en) | 1980-06-21 | 1980-09-11 | A method for preparing a polygonal billet or ingot for processing in a skew-roller piercing mill |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS5714401A (en) |
BE (1) | BE884959A (en) |
DE (1) | DE3023284A1 (en) |
FR (1) | FR2484872A1 (en) |
GB (1) | GB2078579B (en) |
IT (1) | IT1145414B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2450874C2 (en) * | 2010-07-14 | 2012-05-20 | Открытое акционерное общество "Электростальский завод тяжелого машиностроения" | Four-roll sizing stand |
CN103433300A (en) * | 2013-08-07 | 2013-12-11 | 常熟市梅李机械制造有限公司 | Steel billet pushing device for perforating machine |
CN107497855A (en) * | 2017-09-20 | 2017-12-22 | 张家港市圣鼎源制管有限公司 | A kind of steel tube punching machine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE365075C (en) * | 1921-01-08 | 1922-12-07 | Heinrich Stueting | Process for rolling out solid material in the universal rolling mill |
FR631628A (en) * | 1926-06-23 | 1927-12-23 | Metallurg De Montbard Aulnoye | Improvements in the manufacture of seamless tubes |
US2059124A (en) * | 1934-02-15 | 1936-10-27 | Lansdowne Steel & Iron Company | Apparatus for working standard steel billets |
US2341910A (en) * | 1940-07-12 | 1944-02-15 | Samuel E Diescher | Method of and machine for preblooming ingots |
DE2462279B2 (en) * | 1974-04-17 | 1977-05-18 | Ausscheidung aus: 24 18 453 Schloemann Siemag AG, 4000 Düsseldorf | PROCESS AND DEVICE FOR MANUFACTURING OCTAGONAL CROSS SECTIONS AS BASE MATERIAL FOR ROLLING ON ANGLED ROLLING MILLS WITH PLANETARY DRIVES |
IT1076296B (en) * | 1977-03-31 | 1985-04-27 | Properzi Giulio | LAMINATION PROCESS OF A LINGOTTO COMING FROM A CONTINUOUS CASTING MACHINE OF THE WHEEL AND BELT TYPE, AND LAMINATE FOR THE IMPLEMENTATION OF THE PROCEDURE |
DE2747317A1 (en) * | 1977-10-21 | 1979-05-03 | Benteler Geb Paderwerk | Conical tube blank mfr. - by rolling from octagonal billets using pairs of horizontal and vertical rolls with spiral contours |
-
1980
- 1980-06-21 DE DE3023284A patent/DE3023284A1/en not_active Withdrawn
- 1980-08-22 FR FR8018393A patent/FR2484872A1/en active Granted
- 1980-08-28 JP JP11786980A patent/JPS5714401A/en active Pending
- 1980-08-28 BE BE2/58718A patent/BE884959A/en not_active IP Right Cessation
- 1980-09-08 IT IT49629/80A patent/IT1145414B/en active
- 1980-09-11 GB GB8029443A patent/GB2078579B/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2450874C2 (en) * | 2010-07-14 | 2012-05-20 | Открытое акционерное общество "Электростальский завод тяжелого машиностроения" | Four-roll sizing stand |
CN103433300A (en) * | 2013-08-07 | 2013-12-11 | 常熟市梅李机械制造有限公司 | Steel billet pushing device for perforating machine |
CN103433300B (en) * | 2013-08-07 | 2015-04-15 | 常熟市梅李机械制造有限公司 | Steel billet pushing device for perforating machine |
CN107497855A (en) * | 2017-09-20 | 2017-12-22 | 张家港市圣鼎源制管有限公司 | A kind of steel tube punching machine |
Also Published As
Publication number | Publication date |
---|---|
IT8049629A0 (en) | 1980-09-08 |
GB2078579B (en) | 1983-09-01 |
BE884959A (en) | 1980-12-16 |
FR2484872B1 (en) | 1985-03-01 |
DE3023284A1 (en) | 1982-01-28 |
IT1145414B (en) | 1986-11-05 |
FR2484872A1 (en) | 1981-12-24 |
JPS5714401A (en) | 1982-01-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN1053127C (en) | Method and apparatus for elongating metal tubes by means of a mandrel mill | |
US4577481A (en) | Process for production of seamless tube and apparatus for processing seamless tube | |
US6089066A (en) | Process for the production of seamless tubes | |
GB2191966A (en) | Seamless tube manufacture | |
US4318294A (en) | Method of manufacturing seamless metal pipes and tubes | |
US20090090153A1 (en) | Retained mandrel rolling mill for seamless tubes | |
US4262516A (en) | Pierced metal tube blanks and methods of making such blanks | |
GB2078579A (en) | A Method for Preparing a Polygonal Billet or Ingot for Processing in a Skew-roller Piercing Mill | |
US4255956A (en) | Rolling mill sizing apparatus | |
GB2036622A (en) | Manufacture of seamless metal tubes | |
US4289011A (en) | Continuous pipe rolling process | |
EP0519705B2 (en) | Mandrel mill capable of preventing stripping miss | |
US4487049A (en) | Working mandrel and method of rolling elongate hollow pieces in a multi-stand continuous mill on same working mandrel | |
CS205098B2 (en) | Facility for making the seamless pipes | |
EP3885059A1 (en) | Method of and assembly for forming seamless rings by process of ring rolling | |
CA1086104A (en) | Process for the production of seamless tubular products | |
US2063689A (en) | Manufacture of tubes | |
US4909056A (en) | Method and an apparatus for cold-roll forming of annular workpieces | |
US20040139777A1 (en) | Tube compressing roller die | |
US3507135A (en) | Method and apparatus for forming thin metal belts | |
US2085968A (en) | Tube rolling method | |
US2819790A (en) | Process for the manufacture of seamless tubes by the thrust bench method from open and perforated blanks | |
GB2181377A (en) | Manufacture of tubes | |
CN210160334U (en) | Continuous precision forging machine | |
US4178789A (en) | Simultaneous plug-mill rolling for increased production and enhanced tube quality |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
746 | Register noted 'licences of right' (sect. 46/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |