CA1103072A - Device for inserting and pushing a bar into a press- piercing mill - Google Patents
Device for inserting and pushing a bar into a press- piercing millInfo
- Publication number
- CA1103072A CA1103072A CA317,118A CA317118A CA1103072A CA 1103072 A CA1103072 A CA 1103072A CA 317118 A CA317118 A CA 317118A CA 1103072 A CA1103072 A CA 1103072A
- Authority
- CA
- Canada
- Prior art keywords
- action
- bar
- thrust means
- plate
- axis
- 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
- 238000005096 rolling process Methods 0.000 claims abstract description 41
- 238000005553 drilling Methods 0.000 claims abstract description 16
- 229920000136 polysorbate Polymers 0.000 claims 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 241000937413 Axia Species 0.000 description 1
- 241000582342 Carria Species 0.000 description 1
- 241001052209 Cylinder Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
- B21B25/02—Guides, supports, or abutments for mandrels, e.g. carriages or steadiers; Adjusting devices for mandrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/08—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Press Drives And Press Lines (AREA)
- Forging (AREA)
- Metal Rolling (AREA)
- Earth Drilling (AREA)
Abstract
ABSTRACT
A device as disclosed for inserting and push-ing a bar of square cross section into a press-piercing mill, the bar being disposed along a rolling and drilling axis of the mill. The device includes a first thrust means having a rectilinear direction of action. The thrust means is adapted to thrust the bar at a speed for introducing the bar into the mill. A second thrust means having a rectilinear direction of action is adapt-ed for thrusting the bar at a speed for rolling and simultaneous drilling of the bar in the mill. The device also includes an actuator for simultaneously moving the two thrust means from a position in which the direction of action of the first thrust means coincides with the rolling axis and the direction of action of the second thrust means is a distance from the rolling axis, to a position in which the direction of action of the first thrust means is at a distance from the rolling axis and the direction of action of the second thrust means coin-cides with the rolling axis, and vice versa. With this device the loading time for the press-piercing mill is greatly reduced and the efficiency of the mill is accord-ingly increased.
A device as disclosed for inserting and push-ing a bar of square cross section into a press-piercing mill, the bar being disposed along a rolling and drilling axis of the mill. The device includes a first thrust means having a rectilinear direction of action. The thrust means is adapted to thrust the bar at a speed for introducing the bar into the mill. A second thrust means having a rectilinear direction of action is adapt-ed for thrusting the bar at a speed for rolling and simultaneous drilling of the bar in the mill. The device also includes an actuator for simultaneously moving the two thrust means from a position in which the direction of action of the first thrust means coincides with the rolling axis and the direction of action of the second thrust means is a distance from the rolling axis, to a position in which the direction of action of the first thrust means is at a distance from the rolling axis and the direction of action of the second thrust means coin-cides with the rolling axis, and vice versa. With this device the loading time for the press-piercing mill is greatly reduced and the efficiency of the mill is accord-ingly increased.
Description
~1~3~7Z
D~SCRI~TION
The invention relates to a de~ice for illsert-ing and pushins a square bar into a press-piercing mill, the bar bei~g d.~sposed along the drilling and rolling axis of ~he mill.
A pres~--piercing mill is a machine.adapted to F
convert a hot square Dar ~nto a round, ax.~ally bored t bloom. ~he machine, wnich hereinafter will be de- ~
noted by the abbreviation PPM, mainly comprises a duo ~:
mill comprising rou~d-grooved rolls, a elluck mounted .
along the rolling ~d dri.l.ling axis.o~ tl~ .rolli~
mill and extending ~ro~ the outlet side of the duo . mill1 a bit secured to that end of the c~uck which face3 the duo mill, and a substantiall~ tunnel inlet ~.
guide coaxial with the rollin~ and drillin6 axis &~d adapted to guide a square bar to the duo mill.
In order to convert a square bar into a rou~d, axi~ bored bloom in a PPM, the bar must be neld .
exactly along the.rolling axis and pushed between the grooves in the rolls and against the drill bit.
It is known that, in order to meet the rolling and drilling requirements i~ optimum manner, the axial thrust exerted o~ the bar must be considerable, ' ~
11~3i~7Z
/;
_ 3 _ ,~ .
whereas the bar must move betw~n the rolls at a constant, relativel~ low speed (e.g. an average of 0.4 m/sec.).
To this end, in the prior art, a high-power bydraulic or mechanical ~GtUator i~ used and is capable of slowly moving a carria;~e which is guided in a direction parallel to the PPM rolling axis, ths carriage bearing a thrust rod having a longi-tud~nal axis coinciding with the rolling axis.
10~he carriage is movable, relative to the PP~
from a remote position in which a space for receiving a square bar is left between tne free end of th~
th~ust rod and the inlet of the PPM inlet j~uide, &nd ~ a position which is near the duo mill inlet but does ~ot obstruct it.
~ he distance travelled b~ the bar, bet-~een the time when it is positioned between the thrust rod .
and the PP~ inlet guide and the time in which it i~ -completel~ converted into a bored round bloom, can be divided into the following two portions:
he bar-insertion ~ortion. This is the por-tion travelled between the mouth of the inlet j~uide and the place where the bar makes contact with the , ' ~1~3~Z
. :
.
-- 4 -- . t r rolls, and r
D~SCRI~TION
The invention relates to a de~ice for illsert-ing and pushins a square bar into a press-piercing mill, the bar bei~g d.~sposed along the drilling and rolling axis of ~he mill.
A pres~--piercing mill is a machine.adapted to F
convert a hot square Dar ~nto a round, ax.~ally bored t bloom. ~he machine, wnich hereinafter will be de- ~
noted by the abbreviation PPM, mainly comprises a duo ~:
mill comprising rou~d-grooved rolls, a elluck mounted .
along the rolling ~d dri.l.ling axis.o~ tl~ .rolli~
mill and extending ~ro~ the outlet side of the duo . mill1 a bit secured to that end of the c~uck which face3 the duo mill, and a substantiall~ tunnel inlet ~.
guide coaxial with the rollin~ and drillin6 axis &~d adapted to guide a square bar to the duo mill.
In order to convert a square bar into a rou~d, axi~ bored bloom in a PPM, the bar must be neld .
exactly along the.rolling axis and pushed between the grooves in the rolls and against the drill bit.
It is known that, in order to meet the rolling and drilling requirements i~ optimum manner, the axial thrust exerted o~ the bar must be considerable, ' ~
11~3i~7Z
/;
_ 3 _ ,~ .
whereas the bar must move betw~n the rolls at a constant, relativel~ low speed (e.g. an average of 0.4 m/sec.).
To this end, in the prior art, a high-power bydraulic or mechanical ~GtUator i~ used and is capable of slowly moving a carria;~e which is guided in a direction parallel to the PPM rolling axis, ths carriage bearing a thrust rod having a longi-tud~nal axis coinciding with the rolling axis.
10~he carriage is movable, relative to the PP~
from a remote position in which a space for receiving a square bar is left between tne free end of th~
th~ust rod and the inlet of the PPM inlet j~uide, &nd ~ a position which is near the duo mill inlet but does ~ot obstruct it.
~ he distance travelled b~ the bar, bet-~een the time when it is positioned between the thrust rod .
and the PP~ inlet guide and the time in which it i~ -completel~ converted into a bored round bloom, can be divided into the following two portions:
he bar-insertion ~ortion. This is the por-tion travelled between the mouth of the inlet j~uide and the place where the bar makes contact with the , ' ~1~3~Z
. :
.
-- 4 -- . t r rolls, and r
2. The th~lst portion. This is the remai~ing portion, along ~^rh~ch the bar undergoes ~he desired conversion into a corresponding axially bored round bloom.
~..
Portions 1, 2 are both tra~elled through at a reduced speed, i.e. the set speed of operation o~
the actuator. Furthermore, when a new square bar is positioned along the rolling axis upstream of the inlet guide, it i8 necessar~ to wait u-ntil tne slide, moving ab the educed speed of the actuator~ has ~ xeturned to the positio~ remote from the PPM so as B to leave space for ~ a bar between tke thrust rod and the PPM inlet guide.
The result is that the productivity of the FxM
is greably reduced by idle times due to the low speed with which, i~ the prior art, the carriage travels through the iusertio~ portion a-nd its entire retur~
to the position remote from the PPM, the o~ly excep-20 tion being the thrust portion, along which the re- i duced speed is imposed b~ recogni3ed struct~u al oper-ational requirements of the PPM.
'~
~..
Portions 1, 2 are both tra~elled through at a reduced speed, i.e. the set speed of operation o~
the actuator. Furthermore, when a new square bar is positioned along the rolling axis upstream of the inlet guide, it i8 necessar~ to wait u-ntil tne slide, moving ab the educed speed of the actuator~ has ~ xeturned to the positio~ remote from the PPM so as B to leave space for ~ a bar between tke thrust rod and the PPM inlet guide.
The result is that the productivity of the FxM
is greably reduced by idle times due to the low speed with which, i~ the prior art, the carriage travels through the iusertio~ portion a-nd its entire retur~
to the position remote from the PPM, the o~ly excep-20 tion being the thrust portion, along which the re- i duced speed is imposed b~ recogni3ed struct~u al oper-ational requirements of the PPM.
'~
3~7;Z
This is the main technical disadvantage in the prior art insertion and thrust devices for press-piercing mills. The disadvantage is even more notice-able when the PPM is used to produce round, axially bored blooms for a tube rolling mill operating at the rate of four or more work-pieces per minute.
The invention is based on the problem of pro-viding a device for inserting and pushing a square bar in-to a PPM, the structural and functional properties of the device being such as substantially to reduce or eliminate the aforementioned technical disadvantages.
Broadly speaking, therefore, the present in-vention provides a device, for inserting and pushing a square cross section bar into a press-piercing mill, the bar being disposed along a rolling and drilling axis of the mill, comprising: a first thrust means having a respective rectilinear direction of action and adapted for thrusting the bar at a speed set for introducing the bar into the press-piercing mill; a second thrust means having a respective rec-tilinear direction of action and adapted for thrusting thebar at a speed set for rolling and simultaneously drilling of the bar in the press-piercing mill; and an actuator for simultaneously moving the first and second thrust means from a position in which the direction of action of the first thrust means coincides with the rolling axis and the direction of action of the second thrust means is at a distance from the rolling axis, to a position in which the direction of action of the first thrust means is at a distance from the rolling axis and the direction of action of the second thrust means coincides with the rolling axis, and vice versa.
..... , pg/SC~ - 5 -7,Z
According to a second feature of the invention, the directions of action of the thrust means are in the same plane and are in a predetermined spaced relationship.
According to a third feature of the invention, the first and the second thrust means are mounted on a plate movably guided by the actuator in a direction at an angle to the PPM rolling axis.
According to another feature of the invention, the plate is formed with a substantially cradle-shaped seat extending coaxially with the direction of action of the first thrust means and adapted to receive the bar when that direction is in the position remote from the PPM rolling axis.
Advantageously, one end of the plate is rotatable around a pivot having a vertical axis intersecting the rolling and drilling axis, whereas the ,,, pg / ~
-- 7 ~ .
;'.
other end of the plate is ~ositioned near an inlet guide of the press-piercing mill, the directions of action of the first and second thrust means mounted on the plate being in the sa~.e plane as the rolling ~. 5 axis and intersecting at the point where the rol-ling axis interseGts the vertical pivot ~xis.
Other features ~nd ad~-antages of the in~en-tion will be clear from the followi~g de~ailed des-cription of a preferred but not exclusive embodime~t ~~
of a device for inserting and pusking a square bar i~to a press-piercing mill~ with reference to the :
. accompan~ing no~-limitative drawings in which :
., . ~.
~ igure 1.i6 a plan view of a device according to the invention;
Fi~ure 2 i6 a cro~s-section along lina II - II of ~igure 1;
Figure 3 is a view fxom X of the device il- .
lustrated in ~igure 1, and .` ' '~
~igure 4 is a plan view o~ a variant of the device in ~i~ure 1.
In the accompan~ing drawing~, reference 1 3~
.i denotes a pressrpiercing mill which, as i3 i~ow~, mainly compr:ises a duo mill 2, 3 having rovnd-grooved rolls~ a chuck 4 extending along the rolling !~
and drilling axis ~ and ~rom the outlet side of the f duo mill~ the chu¢k ~earing a bit 5 at its end facing the ~uo mill, and a ~substantially tu~nel i~let guide diagrammatically indicated at 6 and adapted to guide a square bar 7 to the duo mill ~n order to g co~vert it into a round, ~xially bored bloom.
Reference 8 denotes a rigid horizontal oblong plate disposed upstream of the mouth 5a of the inlet guide 6 in tha directio~ of motion of bar 7 through ths PPM. ~he end of the plate remote ~rom the PPM is rotatable, with interposition of a bear-i~g 9, on a vertical pivot 10 borne b~ a structure 11 secured to the ground and forming an abutment, aR will be clear from the subseque~t description.
~he vertical axis 10~ of ~he pivot 10 intersects the roll~ng and dri~ling axis A at the point 0.
Under plate 8 there are a number of pairs of wheels 12 re~ularly spaced alon~ the plate. Each pair engages and moves along a corresponding track 13. ~racks 13 form arcs of a circle ~nd are conce~-tric a~d ha~e a commo~ centre of curva~ure on the ~1~3~7;2 _ 9 .
, vcrtical axi5 10a of pivot 10.
Plate 8, ~Jhich can thus rota~e around the ?
vertical axis of pivot 10, mainl~ comprises a - , rectangul&r portion 8a h~ving a preset len~th and 5 a portion 8b substantiall~ in the form of a sector of a circle having a given size and width and form-ing a lower lateral portion ~c.
A thrust means 14, e.g. an oleod~namic cylin-der, is mounted in conventional ma~ner on plate 8.
? ~he directipn of action R of means 14 is horizon~
and extends throu~h the point of intersection 0 of - the vertical axis o~ pivot 10 with the rollin~ and drilling axis A. ~hru~t means 14 acts axiall~ on a carriage 15 which can reciprocate in horizontal B 15 guides 16, 16 formed by plate 8 and extending a predetermined length parallel to the direction of action R of the thrust means. Carriage 15 has a con-ventional hook-like holder 17 for removabl~ engag-ing it with the erd 18a of a thrust rod 18 which -20 likewise extends coaxiall~ with the direction of q action R of thrust means 14. Rod 18, which ~s held a~d guided b~ a conven~iona1 an~ular holder 19 se-cured to pla~e 8, has a cross-section of a suitable shape and size for enga~ing and ~oving in the PPI~
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.
.
11~3~7;2 i.
- inlet gruide 6.
The thrust means 14 is constxucted and di- ~
mensioned so as to subject carriage 15 to a strong !1 thrust at the low speed of the carriage, the thrust and the speed being pxed~te~mined in accordance with reco~nized op~rating requirements when rolli-næ
and simultaneously d~illing a bar 7 in the PPM.
A second thrus~ means 20, e.g. an oleodynami~
cylinder, is mounted by conventional means (~ot --10 shown) o plate 8, or, moxe specifically, at its lower portion 8c. The direction of action ~1 ~
means 20 is horizontal, extends t~xough the point of intersection 0 between axia A and the vertical axis of pivot 10, and forms a constant predetermi~ed B 15 an~le ~ with direction R. Directions R, ~ are in the same plane as axis A.
Thrust means 20 i~ designed ~nd dimensioned 80 a~ to exert a weaker thrust at a considerabl~
higher speed, compared with the set tnrust and the set speed of ~hich thrust means 14 is capable.
A tilting means bearing the gener~l re~erence 21 is mounted on portion 8c of plate 8 at the side of thIust means ~. Means 21 is e.g. of the kind comprising a rotatabl~ mounted pi~ot 22 of pre- . ¦
I
~1~3~72 .
, dete~mined length having a lon~itudi~al ~xis parallel to the direction R1 of action o~ thrust means 20, i:
a pair of bearings 23, 23 secured to the lower por-tion ~c of ! 8, and a number of levers 24 mounted 5 on pivot 22 and projecting therefrom. The project-ing portion of each lever 24 is ~-shaped, comp~is-in~ perpe~dicular webs 24a, 24b adapted to receive 9 a square bar 7~ Reference 25 diagrammaticall~ in-.. . . , ;.
dicates an actuator, e.g. a h~draulic cylinder, for -? rotating pivot 22 around its longitudinal axis to a first position in which webs 24a of levexs 24t~
are horizontal and ex*end towards the exterior o~~ ~
plate 8 to a second position in which webs ~4~ areY.
horizontal and extend towards the i~terior of the ~z~/.3f~
v4ahffc.
26 denotes a vertical wall or abutmer~t for the bar, borne by a number of bearings 27 secured to plate 8 a~d extending parallel to direction R1 ~
- action of thrust means 20, from the side thereof opposite pivot 22. Wall 26, which kas predete~mined dimensions and may be positioned in accordance with a register, co-operates witk levers 24 when the levers are brought into the second position, to form a cradle-like seat S exte~ding coaxiall~ with direc-. .... 3~~33~
tion R1 and adapted to receive a bar 7 in the ma~ner described hereinaft~r~
Reference 28 denotes a bed-plate secured to the ~round and extending parallel to axi.s Q, substantially 5 in line with the rollin~-mill inlet side 6 æd below k plate 8. ~ed-plate 28 substantiall~ comprises a num-ber of uprights 29 which proaect abo~e plate ~ throug~. s correspondin~ transverse slots 29a which are formed - in the plate and extend in arcs of a circle having a 10 common ce~tre on the vertical axis 10a of pivot 10.
Uprights 29 are dimensioned and designed to bear a ~quare bar 7 at the moment when it is i~troduced ~nto the rolling mi~l throu~h the inlet guide 6. '.rO this end, uprights 29 co-operate with a bar guide de~lce 15 (general reference 30) which can be con~entional. In the accompanying drawin~s, device 30.mainly comprises ~ ;~
box-like member 31 (Figure ~) having a substanti~
U-shaped cross-section and parallel webs 31a anà 31b, ope~ at the bottom and extending over all the uprights C 20 j~ with whi~-h it forms a ~tunnel~ ha~ing the right . dimensions for surrounding and suitably guiding tne square bar 7. More particularly the vertical wall 31b of member 30, which is firmly secured b~ plate 8, is tiltable by an actuatox 33, e.g. a hydraulic .
.
\
3~
. i .
l3 -cylinder, around a pivot 32 paral.lel to th.e direc-tion of action R of the first thrust means 14.
This tilting is necessary in order laterally to in-sert a bar ? into the tunnel formed by uprights 29 ~.
and device 30.
~ eference 34 in ~i.gure 3 diagrammaticall~
indicates a double-actin~ hydraulic cylinder used for ~ xotating plate 8 around the vertical axis of pjvot 10.
' .. Referènce,s 35, 35a indicate two stop means for limit . 10 ing the rotation in either direction. . .
. In ~igure 3, re~erence 36 denotes a conven- .
tional roller track disposed at the ~ide of plate 8 for supplying succe~sive bars 7 for conveyin~ to the PPM, using the device according to the invention.
o~ .- ~e ~J 15 Reference 37 denotes ea~e~t of a ~umber of thrust means used for transferring a bar 7 from the roller trac~ 36 to the group of ~-sllaped levers 24 in the tilt-. .
ing means 21, when the levers are held in the afore-mentioned first positio~. . .
20 ~he device according to the inven~ion ope~ates as follows:
At the ~eginnin~ of a working cycle, plate 8 is positio~ed at an angle xelative to pivot 10 so that the direction of action R of thrust means 14 coincides , .
'~
1.
.. , , . ~.
` \
~1¢3~7~
with the rolling and drilling axis A. When. plate 8 is in the last-mentioned position, the tiltin~ means b 21 is alo~gside and parallel to the end portion or the roller track 36, and all the levers 24 also face r~
. 5 track 36. ~hs vertical wall 31b of the bax-~lidin~ i~
device 30 is in the raised position.
A square ~ar 7 is placed on tlle tilting ds-vice 21 by action of the thrus~ means 37~ Next, oleo-dynamic cylinder 25 rotates tilting means 21 around its . 10 longitudinal axis and bar ? is positioned a~ainst ~ha vertical or abutment wall 26 in axial alignnent with . the direction of action R1 ~ thrust means 20.
~ext, plate 8 is rotated around piw t 10 by action of oleodgn~mic c~linder 34 un~il it me~t~ ~he 15 stop means 35, in which position the direction R1 coincides with the rolling and drilling axis A. At the end of the aforementioned rotation o~ plate 89 ~ar j is positioned on the group of uprights 29 against the vertical wall 31a of ~he bar-guidin6 20 device 30. Wall ~1b is lowered so as to enclose bar 7 in a ~uide tunnel, after which thrust me~ls 20 rapidly inserts the bar through the inlet guide 6 until it enters the inlet ol~ the PPM xolls 2, 3. At this stage, t~rust means 20 is returned to the ini~ial "' I
, . . ~ , .
~ 1~ 3~7~
.
.
,.
.position, ~;hereu~on cylinder 34 immediately rotates ~ .
plate 8 to the position in which direction R coin- . i cides with axis A.
Plate 8 remains motionless while a new bar 7 ~$
is placed on the tilting means 21. Thrust means 1~
via Garxi~ge 15 nna rod 18, exerts the strong thI~t ~ .-for ~hich it was de.si.gned, pxessing bar 7 against bit 5.
,.................................... ...
. - . After bar 7 has been converted into a round, ~l : 10: axially bored bloom, thrust means 14 is returned to ~ -the initial position. ~s soon as thrust rod 18 is . .
released from t-he mouth 6a of the inlet ~i.de 6, .
cylinder 34 rotates plate 8 to the poæition ~or in-~erting a new bar 7, which has been placed on tilti~g means 21.
e main ad~antage of the dev.iee acoording to the invention is the considerable reduction in the .
. idle time hitherto required for loading and insert-ing a bar into a PPM. The reasons are as fo~lows:
.
1) A square bar for rolli.ng and simultane-ously drilling in a -rJpM can travel throug~ the in-~extion portion, as previously defined, in a rela-tively short time owing to the use of r thrust meens - .
.. . . .
, 3~i~
- 16 - e 20 which is dimensioned ana designed so that it ca~ drive the bar at a considerable speed. ~, . 2) A new s~uare bar can be positioned along the rollin~ and drilling axis (A) as soo~ as the ,?
5 thrust rod 18 has disengaged from the PPM inlet guide. Consequently, in contrast with the prior art, -the idle time is completely elimina.ted !since t~e.
carriage 15 bearing and actuating the thrust rod re-. turn to its initial or remote position from the PPM
10 so as to leave space for receiving a new s~uare bar between the free end Or the thrust rod and the mouth o~ the PPM irllet guide~ .
3) Additional time is saved wherl loadin~ a new square bar for rolling and drilling si~ce, ~hile .15 a square bar is being converted into a round, axi.ally bored bloom, a new bar is being loaded on to the rigid plate bearing the thrust means 14, 20~
Clearly, although the previousl~-described embodiment of the device is preferred~ numerous StrUG-tural variants can be made to the device without there-by departing from the scope of the invention as de-fined in the clai~s hereinafter. In ~igure 4, lor ,' .
~1~3~72 -- '1 7 -- j ex~plet the movable plate is a plate 10~ movably guided alon~ a number of tracks 113 peIpendicula~
to axis A and between two stop me~ns 135, 135a. In that case th.e directions of actio~ R, R1 of thrust ~ :
means 114, 120 will be parallel besides bein~ in the same plane as axis A. b , - ': i, e .
' '' . " ~
. , . , .
r ' ~ .
~' ~
This is the main technical disadvantage in the prior art insertion and thrust devices for press-piercing mills. The disadvantage is even more notice-able when the PPM is used to produce round, axially bored blooms for a tube rolling mill operating at the rate of four or more work-pieces per minute.
The invention is based on the problem of pro-viding a device for inserting and pushing a square bar in-to a PPM, the structural and functional properties of the device being such as substantially to reduce or eliminate the aforementioned technical disadvantages.
Broadly speaking, therefore, the present in-vention provides a device, for inserting and pushing a square cross section bar into a press-piercing mill, the bar being disposed along a rolling and drilling axis of the mill, comprising: a first thrust means having a respective rectilinear direction of action and adapted for thrusting the bar at a speed set for introducing the bar into the press-piercing mill; a second thrust means having a respective rec-tilinear direction of action and adapted for thrusting thebar at a speed set for rolling and simultaneously drilling of the bar in the press-piercing mill; and an actuator for simultaneously moving the first and second thrust means from a position in which the direction of action of the first thrust means coincides with the rolling axis and the direction of action of the second thrust means is at a distance from the rolling axis, to a position in which the direction of action of the first thrust means is at a distance from the rolling axis and the direction of action of the second thrust means coincides with the rolling axis, and vice versa.
..... , pg/SC~ - 5 -7,Z
According to a second feature of the invention, the directions of action of the thrust means are in the same plane and are in a predetermined spaced relationship.
According to a third feature of the invention, the first and the second thrust means are mounted on a plate movably guided by the actuator in a direction at an angle to the PPM rolling axis.
According to another feature of the invention, the plate is formed with a substantially cradle-shaped seat extending coaxially with the direction of action of the first thrust means and adapted to receive the bar when that direction is in the position remote from the PPM rolling axis.
Advantageously, one end of the plate is rotatable around a pivot having a vertical axis intersecting the rolling and drilling axis, whereas the ,,, pg / ~
-- 7 ~ .
;'.
other end of the plate is ~ositioned near an inlet guide of the press-piercing mill, the directions of action of the first and second thrust means mounted on the plate being in the sa~.e plane as the rolling ~. 5 axis and intersecting at the point where the rol-ling axis interseGts the vertical pivot ~xis.
Other features ~nd ad~-antages of the in~en-tion will be clear from the followi~g de~ailed des-cription of a preferred but not exclusive embodime~t ~~
of a device for inserting and pusking a square bar i~to a press-piercing mill~ with reference to the :
. accompan~ing no~-limitative drawings in which :
., . ~.
~ igure 1.i6 a plan view of a device according to the invention;
Fi~ure 2 i6 a cro~s-section along lina II - II of ~igure 1;
Figure 3 is a view fxom X of the device il- .
lustrated in ~igure 1, and .` ' '~
~igure 4 is a plan view o~ a variant of the device in ~i~ure 1.
In the accompan~ing drawing~, reference 1 3~
.i denotes a pressrpiercing mill which, as i3 i~ow~, mainly compr:ises a duo mill 2, 3 having rovnd-grooved rolls~ a chuck 4 extending along the rolling !~
and drilling axis ~ and ~rom the outlet side of the f duo mill~ the chu¢k ~earing a bit 5 at its end facing the ~uo mill, and a ~substantially tu~nel i~let guide diagrammatically indicated at 6 and adapted to guide a square bar 7 to the duo mill ~n order to g co~vert it into a round, ~xially bored bloom.
Reference 8 denotes a rigid horizontal oblong plate disposed upstream of the mouth 5a of the inlet guide 6 in tha directio~ of motion of bar 7 through ths PPM. ~he end of the plate remote ~rom the PPM is rotatable, with interposition of a bear-i~g 9, on a vertical pivot 10 borne b~ a structure 11 secured to the ground and forming an abutment, aR will be clear from the subseque~t description.
~he vertical axis 10~ of ~he pivot 10 intersects the roll~ng and dri~ling axis A at the point 0.
Under plate 8 there are a number of pairs of wheels 12 re~ularly spaced alon~ the plate. Each pair engages and moves along a corresponding track 13. ~racks 13 form arcs of a circle ~nd are conce~-tric a~d ha~e a commo~ centre of curva~ure on the ~1~3~7;2 _ 9 .
, vcrtical axi5 10a of pivot 10.
Plate 8, ~Jhich can thus rota~e around the ?
vertical axis of pivot 10, mainl~ comprises a - , rectangul&r portion 8a h~ving a preset len~th and 5 a portion 8b substantiall~ in the form of a sector of a circle having a given size and width and form-ing a lower lateral portion ~c.
A thrust means 14, e.g. an oleod~namic cylin-der, is mounted in conventional ma~ner on plate 8.
? ~he directipn of action R of means 14 is horizon~
and extends throu~h the point of intersection 0 of - the vertical axis o~ pivot 10 with the rollin~ and drilling axis A. ~hru~t means 14 acts axiall~ on a carriage 15 which can reciprocate in horizontal B 15 guides 16, 16 formed by plate 8 and extending a predetermined length parallel to the direction of action R of the thrust means. Carriage 15 has a con-ventional hook-like holder 17 for removabl~ engag-ing it with the erd 18a of a thrust rod 18 which -20 likewise extends coaxiall~ with the direction of q action R of thrust means 14. Rod 18, which ~s held a~d guided b~ a conven~iona1 an~ular holder 19 se-cured to pla~e 8, has a cross-section of a suitable shape and size for enga~ing and ~oving in the PPI~
- `
.
.
11~3~7;2 i.
- inlet gruide 6.
The thrust means 14 is constxucted and di- ~
mensioned so as to subject carriage 15 to a strong !1 thrust at the low speed of the carriage, the thrust and the speed being pxed~te~mined in accordance with reco~nized op~rating requirements when rolli-næ
and simultaneously d~illing a bar 7 in the PPM.
A second thrus~ means 20, e.g. an oleodynami~
cylinder, is mounted by conventional means (~ot --10 shown) o plate 8, or, moxe specifically, at its lower portion 8c. The direction of action ~1 ~
means 20 is horizontal, extends t~xough the point of intersection 0 between axia A and the vertical axis of pivot 10, and forms a constant predetermi~ed B 15 an~le ~ with direction R. Directions R, ~ are in the same plane as axis A.
Thrust means 20 i~ designed ~nd dimensioned 80 a~ to exert a weaker thrust at a considerabl~
higher speed, compared with the set tnrust and the set speed of ~hich thrust means 14 is capable.
A tilting means bearing the gener~l re~erence 21 is mounted on portion 8c of plate 8 at the side of thIust means ~. Means 21 is e.g. of the kind comprising a rotatabl~ mounted pi~ot 22 of pre- . ¦
I
~1~3~72 .
, dete~mined length having a lon~itudi~al ~xis parallel to the direction R1 of action o~ thrust means 20, i:
a pair of bearings 23, 23 secured to the lower por-tion ~c of ! 8, and a number of levers 24 mounted 5 on pivot 22 and projecting therefrom. The project-ing portion of each lever 24 is ~-shaped, comp~is-in~ perpe~dicular webs 24a, 24b adapted to receive 9 a square bar 7~ Reference 25 diagrammaticall~ in-.. . . , ;.
dicates an actuator, e.g. a h~draulic cylinder, for -? rotating pivot 22 around its longitudinal axis to a first position in which webs 24a of levexs 24t~
are horizontal and ex*end towards the exterior o~~ ~
plate 8 to a second position in which webs ~4~ areY.
horizontal and extend towards the i~terior of the ~z~/.3f~
v4ahffc.
26 denotes a vertical wall or abutmer~t for the bar, borne by a number of bearings 27 secured to plate 8 a~d extending parallel to direction R1 ~
- action of thrust means 20, from the side thereof opposite pivot 22. Wall 26, which kas predete~mined dimensions and may be positioned in accordance with a register, co-operates witk levers 24 when the levers are brought into the second position, to form a cradle-like seat S exte~ding coaxiall~ with direc-. .... 3~~33~
tion R1 and adapted to receive a bar 7 in the ma~ner described hereinaft~r~
Reference 28 denotes a bed-plate secured to the ~round and extending parallel to axi.s Q, substantially 5 in line with the rollin~-mill inlet side 6 æd below k plate 8. ~ed-plate 28 substantiall~ comprises a num-ber of uprights 29 which proaect abo~e plate ~ throug~. s correspondin~ transverse slots 29a which are formed - in the plate and extend in arcs of a circle having a 10 common ce~tre on the vertical axis 10a of pivot 10.
Uprights 29 are dimensioned and designed to bear a ~quare bar 7 at the moment when it is i~troduced ~nto the rolling mi~l throu~h the inlet guide 6. '.rO this end, uprights 29 co-operate with a bar guide de~lce 15 (general reference 30) which can be con~entional. In the accompanying drawin~s, device 30.mainly comprises ~ ;~
box-like member 31 (Figure ~) having a substanti~
U-shaped cross-section and parallel webs 31a anà 31b, ope~ at the bottom and extending over all the uprights C 20 j~ with whi~-h it forms a ~tunnel~ ha~ing the right . dimensions for surrounding and suitably guiding tne square bar 7. More particularly the vertical wall 31b of member 30, which is firmly secured b~ plate 8, is tiltable by an actuatox 33, e.g. a hydraulic .
.
\
3~
. i .
l3 -cylinder, around a pivot 32 paral.lel to th.e direc-tion of action R of the first thrust means 14.
This tilting is necessary in order laterally to in-sert a bar ? into the tunnel formed by uprights 29 ~.
and device 30.
~ eference 34 in ~i.gure 3 diagrammaticall~
indicates a double-actin~ hydraulic cylinder used for ~ xotating plate 8 around the vertical axis of pjvot 10.
' .. Referènce,s 35, 35a indicate two stop means for limit . 10 ing the rotation in either direction. . .
. In ~igure 3, re~erence 36 denotes a conven- .
tional roller track disposed at the ~ide of plate 8 for supplying succe~sive bars 7 for conveyin~ to the PPM, using the device according to the invention.
o~ .- ~e ~J 15 Reference 37 denotes ea~e~t of a ~umber of thrust means used for transferring a bar 7 from the roller trac~ 36 to the group of ~-sllaped levers 24 in the tilt-. .
ing means 21, when the levers are held in the afore-mentioned first positio~. . .
20 ~he device according to the inven~ion ope~ates as follows:
At the ~eginnin~ of a working cycle, plate 8 is positio~ed at an angle xelative to pivot 10 so that the direction of action R of thrust means 14 coincides , .
'~
1.
.. , , . ~.
` \
~1¢3~7~
with the rolling and drilling axis A. When. plate 8 is in the last-mentioned position, the tiltin~ means b 21 is alo~gside and parallel to the end portion or the roller track 36, and all the levers 24 also face r~
. 5 track 36. ~hs vertical wall 31b of the bax-~lidin~ i~
device 30 is in the raised position.
A square ~ar 7 is placed on tlle tilting ds-vice 21 by action of the thrus~ means 37~ Next, oleo-dynamic cylinder 25 rotates tilting means 21 around its . 10 longitudinal axis and bar ? is positioned a~ainst ~ha vertical or abutment wall 26 in axial alignnent with . the direction of action R1 ~ thrust means 20.
~ext, plate 8 is rotated around piw t 10 by action of oleodgn~mic c~linder 34 un~il it me~t~ ~he 15 stop means 35, in which position the direction R1 coincides with the rolling and drilling axis A. At the end of the aforementioned rotation o~ plate 89 ~ar j is positioned on the group of uprights 29 against the vertical wall 31a of ~he bar-guidin6 20 device 30. Wall ~1b is lowered so as to enclose bar 7 in a ~uide tunnel, after which thrust me~ls 20 rapidly inserts the bar through the inlet guide 6 until it enters the inlet ol~ the PPM xolls 2, 3. At this stage, t~rust means 20 is returned to the ini~ial "' I
, . . ~ , .
~ 1~ 3~7~
.
.
,.
.position, ~;hereu~on cylinder 34 immediately rotates ~ .
plate 8 to the position in which direction R coin- . i cides with axis A.
Plate 8 remains motionless while a new bar 7 ~$
is placed on the tilting means 21. Thrust means 1~
via Garxi~ge 15 nna rod 18, exerts the strong thI~t ~ .-for ~hich it was de.si.gned, pxessing bar 7 against bit 5.
,.................................... ...
. - . After bar 7 has been converted into a round, ~l : 10: axially bored bloom, thrust means 14 is returned to ~ -the initial position. ~s soon as thrust rod 18 is . .
released from t-he mouth 6a of the inlet ~i.de 6, .
cylinder 34 rotates plate 8 to the poæition ~or in-~erting a new bar 7, which has been placed on tilti~g means 21.
e main ad~antage of the dev.iee acoording to the invention is the considerable reduction in the .
. idle time hitherto required for loading and insert-ing a bar into a PPM. The reasons are as fo~lows:
.
1) A square bar for rolli.ng and simultane-ously drilling in a -rJpM can travel throug~ the in-~extion portion, as previously defined, in a rela-tively short time owing to the use of r thrust meens - .
.. . . .
, 3~i~
- 16 - e 20 which is dimensioned ana designed so that it ca~ drive the bar at a considerable speed. ~, . 2) A new s~uare bar can be positioned along the rollin~ and drilling axis (A) as soo~ as the ,?
5 thrust rod 18 has disengaged from the PPM inlet guide. Consequently, in contrast with the prior art, -the idle time is completely elimina.ted !since t~e.
carriage 15 bearing and actuating the thrust rod re-. turn to its initial or remote position from the PPM
10 so as to leave space for receiving a new s~uare bar between the free end Or the thrust rod and the mouth o~ the PPM irllet guide~ .
3) Additional time is saved wherl loadin~ a new square bar for rolling and drilling si~ce, ~hile .15 a square bar is being converted into a round, axi.ally bored bloom, a new bar is being loaded on to the rigid plate bearing the thrust means 14, 20~
Clearly, although the previousl~-described embodiment of the device is preferred~ numerous StrUG-tural variants can be made to the device without there-by departing from the scope of the invention as de-fined in the clai~s hereinafter. In ~igure 4, lor ,' .
~1~3~72 -- '1 7 -- j ex~plet the movable plate is a plate 10~ movably guided alon~ a number of tracks 113 peIpendicula~
to axis A and between two stop me~ns 135, 135a. In that case th.e directions of actio~ R, R1 of thrust ~ :
means 114, 120 will be parallel besides bein~ in the same plane as axis A. b , - ': i, e .
' '' . " ~
. , . , .
r ' ~ .
~' ~
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device, for inserting and pushing a square cross section bar into a press-piercing mill, the bar being disposed along a rolling and drilling axis of the mill, comprising:
a first thrust means having a respective rectil-inear direction of action and adapted for thrust-ing the bar at a speed set for introducing the bar into the press-piercing mill;
a second thrust means having a respective rec-tilinear direction of action and adapted for thrusting the bar at a speed set for rolling and simultaneously drilling of the bar in the press-piercing mill; and an actuator for simultaneously moving the first and second thrust means from a position in which the direction of action of said first thrust means coincides with said rolling axis and the direction of action of said second thrust means is at a distance from said rolling axis, to a position in which the direction of action of said first thrust means is at a distance from said rolling axis and the direction of action of said second thrust means coincides with said rolling axis, and vice versa.
a first thrust means having a respective rectil-inear direction of action and adapted for thrust-ing the bar at a speed set for introducing the bar into the press-piercing mill;
a second thrust means having a respective rec-tilinear direction of action and adapted for thrusting the bar at a speed set for rolling and simultaneously drilling of the bar in the press-piercing mill; and an actuator for simultaneously moving the first and second thrust means from a position in which the direction of action of said first thrust means coincides with said rolling axis and the direction of action of said second thrust means is at a distance from said rolling axis, to a position in which the direction of action of said first thrust means is at a distance from said rolling axis and the direction of action of said second thrust means coincides with said rolling axis, and vice versa.
2. A device according to claim 1, in which said first and second thrust means are mounted on a common plate movably guided by said actuator in a direction at an angle to said rolling axis.
3. A device according to claim 2, in which the direc-tions of action of said first and second thrust means are in the same plane and are set at a predetermined spaced relation-ship.
4. A device according to claim 1, 2 or 3 in which said directions of action are in the same plane as the rolling axis.
5. A device according to claim 3 in which said plate has one end pivoted around a pivot having a vertical axis intersecting said rolling axis, whereas the other end of the plate is positioned near an inlet guide of the press-piercing mill, the co-planar directions of action of said first and second thrust means forming a predetermined angle and intersecting at the point of intersection between said rolling axis and said vertical axis, the actuator being adapted to displace the plate around said vertical axis be-tween two stop means.
6. A device according to claim 3 in which said plate is movably guided by the actuator in a direction per-pendicular to said rolling axis between two stop means, and the directions of action of said first and second thrust means, mounted on said plate, are parallel and in the same plane as said rolling axis.
7. A device according to claim 5 or claim 6, in which said plate is provided with a substantially cradle-shaped seat extending coaxially to the direction of action of said first thrust means and positioned between the second thrust means and that end of the plate which is near the press-piercing mill inlet guide.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT3029277A IT1088731B (en) | 1977-12-01 | 1977-12-01 | INTRODUCTION AND PUSHING DEVICE OF A BAR IN A PERFORATOR-LAMINATE |
| IT30292A/77 | 1977-12-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1103072A true CA1103072A (en) | 1981-06-16 |
Family
ID=11229495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA317,118A Expired CA1103072A (en) | 1977-12-01 | 1978-11-30 | Device for inserting and pushing a bar into a press- piercing mill |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5493662A (en) |
| CA (1) | CA1103072A (en) |
| DE (1) | DE2851922A1 (en) |
| ES (1) | ES475566A1 (en) |
| FR (1) | FR2410516A1 (en) |
| GB (1) | GB2009008B (en) |
| IT (1) | IT1088731B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1094729B (en) * | 1978-04-21 | 1985-08-02 | Innocenti Santeustacchio Spa | INTRODUCTION AND PUSHING EQUIPMENT OF A BAR IN A PERFORATOR-ROLLING MACHINE |
| IT1149649B (en) * | 1982-02-15 | 1986-12-03 | Innocenti Santeustacchio Spa | CONTAINMENT AND CENTERING GUIDE BILLET FOR ENTRY GUIDE OF A PERFORATING MILL |
| CN107350288B (en) * | 2017-07-31 | 2023-07-25 | 北京京诚瑞信长材工程技术有限公司 | Rail beam type thermal centering machine |
-
1977
- 1977-12-01 IT IT3029277A patent/IT1088731B/en active
-
1978
- 1978-11-15 GB GB7844613A patent/GB2009008B/en not_active Expired
- 1978-11-27 FR FR7833456A patent/FR2410516A1/en active Granted
- 1978-11-30 DE DE19782851922 patent/DE2851922A1/en not_active Withdrawn
- 1978-11-30 ES ES475566A patent/ES475566A1/en not_active Expired
- 1978-11-30 JP JP14730278A patent/JPS5493662A/en active Granted
- 1978-11-30 CA CA317,118A patent/CA1103072A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2410516B3 (en) | 1981-10-02 |
| JPS6120364B2 (en) | 1986-05-22 |
| IT1088731B (en) | 1985-06-10 |
| GB2009008B (en) | 1982-01-20 |
| FR2410516A1 (en) | 1979-06-29 |
| DE2851922A1 (en) | 1979-06-07 |
| GB2009008A (en) | 1979-06-13 |
| JPS5493662A (en) | 1979-07-24 |
| ES475566A1 (en) | 1979-04-01 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |